Tag Archives: casting valve

Cast steel valve drive species

Posted on March 5, 2012 by admin

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casting valve – China Manufacturer
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Worldwide, the industry sources. The complete specifications of the varieties of the valve cast steel valve drive (electric, pneumatic, hydraulic, electric – hydraulic linkage or gas – liquid interaction, etc.), safe and reliable valve manufacturers. In recent years, the valve has developed intelligent drive this regard, the valve home or blank. Domestic cast steel valve industry in general and the difference of the foreign. That technically backward product design, unchanged for years, weak new production valve product development, specification variety, can not meet the process requirements of all walks of life. Products in the development of tracking foreign technology, not enough effort from top to bottom process development and manufacturing processes are more backward.
National cast steel valve industry has made great progress. From cast steel valves Branch of China General Machinery Butterfly Industry Association data show that the entrance of foreign from the last century, 10 valves and nine missed \"a lot of products. Country\\ s annual market turnover of cast steel valves up to 500 billion yuan, of which there are over 100 billion market cast steel valve enterprise by foreign occupation, to change this situation, through innovative technologies to improve the quality of cast steel valves is the key Butterfly Valves.
Cast steel valve technology abroad, leaving behind 10 years
Industrialized foreign countries, cast steel valve, butterfly valve gate in mechanical products occupy a large proportion. The cast steel valve output is the sum of the three compressors, fans and pumps, while about 5% of the entire machinery of industrial output, especially electric power, petrochemical, metallurgy, rural water supply and drainage system as an important component of the major technologies and equipment of local , cast steel valves play a key role, and the very large amount. Currently, the country cast steel valve enterprise of about 6,000 more than the annual output value of 900 beyond the 500 butterfly valves million.
Professor level senior engineer of the Beijing Municipal Engineering Design Butterfly Valves General Hospital Wangguang Jie, Zhang Yanhui that when it comes to the status of the country cast steel valve industry. While engaged in the production of cast steel valves enterprises, but are mostly small and medium-sized enterprises. Neither the drawings, a few small businesses processes, the hydraulic control valve and technical personnel, the product does not meet national standards, and even the production of fake and shoddy products, seriously disrupting the cast steel valve market, but also a waste of precious resources. Many large state-owned enterprises are facing a heavy burden, financial difficulties, technical trite, and not have the strength to carry out technological transformation and investment in new projects. Cast steel valve hydraulic control valve with the international advanced level is probably a difference of about 10 years, such as high temperature and pressure and resistant to corrosion products can not produce, cast steel valves used by the offshore oil exploitation requirements

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On the titanium investment casting casting technology

Posted on January 26, 2012 by admin

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forging company – China Manufacturer
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http://www.steel-casting-forging.com/key-forging-company-48/

Titanium castings/">investment casting casting technology development is necessary.
Currently, titanium investment casting casting technology has been in the civil aerospace titanium and titanium structural

components are widely used in manufacturing, this technology is to meet the needs of the aerospace industry to develop.
With the titanium investment casting casting casting technique widely used titanium alloy, its quality and usefulness of our

requirements more stringent, while the level of costs is to limit its application prospects is an important factor. Although the

cost is low but the graphite casting surface quality is poor, while not suitable for production of thin-walled complex parts,

with the surface layer of refractory metal or ceramic surface layer of yttrium oxide shell can be cast out of high quality

titanium castings, but the cost is very high. In this case study a lower cost, suitable for producing complex thin-walled

titanium oxide ceramic melting system shell mold casting of the new technology has become a necessity.
Casting titanium investment casting shell system technology mainly the choice of materials
Casting titanium investment casting shell material system technology mainly wax cast titanium body mainly uses imported waxes,

the gate part of the use of lower cost, performance can meet the requirements of self-wax, respectively, after pressing, welding

synthetic wax module. Parameters as follows:
Performance self-wax wax imports drop point / ℃ 69 ~ 7170.5 freezing point / ℃ 58 ~ 5960 ~ 62 linear shrinkage /% 1.30.4 0.6

Penetration / 1/10mm12 ~ 1411 Zhao tensile strength hardness 21.119 / MPa3. 692.91 binder wetting angle / ° 89 ~ 9279 ~ 82

density / g/mm30.91 ~ 0.940.95 ~ 1 ash /% <0.010.05 of the surface layer of material parameters: the surface layer and the

adjacent refractory binder the main component of the surface layer of zirconium dioxide slurry, size of 30μm the following

organic zirconium sol, size 10 ~ 15nm surface layer and the adjacent surface sanding the main component of zirconium sand, size

of 150 ~ 300μm. The main component of the surface layer adjacent to ZrO2.SiO2 zircon sand back layer system shell and sand

silica powder material Morley
Titanium investment casting shell casting method of manufacturing technology, the analysis of the main
Titanium investment casting shell casting system are drying, dewaxing, firing three steps
    1, dry: the surface layer and the adjacent surface of the drying times are 24h, the temperature is 20 ℃, relative humidity

of not less than 60%, the back layer of the drying time of not less than 4h, the surface layer with the same other conditions.
2, dewaxing: microwave dewaxing, the equipment used for large cavity size, 1500W Adjustable intensity of the microwave.
3, roasting: After dewaxing of gas shell in the roaster without calcination.
Casting titanium investment casting shell system technology mainly the choice of process parameters
System shell casting process parameters on the quality of performance in: batter ingredients that Casting powder liquid ratio,

dewaxing, and the calcination process parameters. Therefore, the choice of the system shell to repeat the process parameters it

is considered, powder-liquid ratio across the layer thickness and the coating film and the suspension rate of shell powder-liquid

ratio and calcination temperature on the residual strength at room and high temperature affect these two aspects.
Under normal circumstances, most of us use the microwave intensity of 50%, dewaxing time about 8min.

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On the titanium investment casting casting technology

Posted on January 19, 2012 by admin

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forging company – China Manufacturer
Thank you for inquiry my forging company, Tel:0086-574-27851019 E-MAIL:thomas@steel-casting-forging.com
http://www.steel-casting-forging.com/key-forging-company-48/

Titanium castings/">investment casting casting technology development is necessary.
Currently, titanium investment casting casting technology has been in the civil aerospace titanium and titanium structural

components are widely used in manufacturing, this technology is to meet the needs of the aerospace industry to develop.
With the titanium investment casting casting casting technique widely used titanium alloy, its quality and usefulness of our

requirements more stringent, while the level of costs is to limit its application prospects is an important factor. Although the

cost is low but the graphite casting surface quality is poor, while not suitable for production of thin-walled complex parts,

with the surface layer of refractory metal or ceramic surface layer of yttrium oxide shell can be cast out of high quality

titanium castings, but the cost is very high. In this case study a lower cost, suitable for producing complex thin-walled

titanium oxide ceramic melting system shell mold casting of the new technology has become a necessity.
Casting titanium investment casting shell system technology mainly the choice of materials
Casting titanium investment casting shell material system technology mainly wax cast titanium body mainly uses imported waxes,

the gate part of the use of lower cost, performance can meet the requirements of self-wax, respectively, after pressing, welding

synthetic wax module. Parameters as follows:
Performance self-wax wax imports drop point / ℃ 69 ~ 7170.5 freezing point / ℃ 58 ~ 5960 ~ 62 linear shrinkage /% 1.30.4 0.6

Penetration / 1/10mm12 ~ 1411 Zhao tensile strength hardness 21.119 / MPa3. 692.91 binder wetting angle / ° 89 ~ 9279 ~ 82

density / g/mm30.91 ~ 0.940.95 ~ 1 ash /% <0.010.05 of the surface layer of material parameters: the surface layer and the

adjacent refractory binder the main component of the surface layer of zirconium dioxide slurry, size of 30μm the following

organic zirconium sol, size 10 ~ 15nm surface layer and the adjacent surface sanding the main component of zirconium sand, size

of 150 ~ 300μm. The main component of the surface layer adjacent to ZrO2.SiO2 zircon sand back layer system shell and sand

silica powder material Morley
Titanium investment casting shell casting method of manufacturing technology, the analysis of the main
Titanium investment casting shell casting system are drying, dewaxing, firing three steps
    1, dry: the surface layer and the adjacent surface of the drying times are 24h, the temperature is 20 ℃, relative humidity

of not less than 60%, the back layer of the drying time of not less than 4h, the surface layer with the same other conditions.
2, dewaxing: microwave dewaxing, the equipment used for large cavity size, 1500W Adjustable intensity of the microwave.
3, roasting: After dewaxing of gas shell in the roaster without calcination.
Casting titanium investment casting shell system technology mainly the choice of process parameters
System shell casting process parameters on the quality of performance in: batter ingredients that Casting powder liquid ratio,

dewaxing, and the calcination process parameters. Therefore, the choice of the system shell to repeat the process parameters it

is considered, powder-liquid ratio across the layer thickness and the coating film and the suspension rate of shell powder-liquid

ratio and calcination temperature on the residual strength at room and high temperature affect these two aspects.
Under normal circumstances, most of us use the microwave intensity of 50%, dewaxing time about 8min.

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LFC latest developments in special plastic

Posted on December 30, 2011 by admin

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investment casting – China Manufacturer
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Lost Foam Casting Mold Casting of the new technology industry in China has gone through more than 20 years, (because of its low

investment, environmental protection, precision molding, etc.), from the beginning to the current development of several hundreds

of first thousand.
EPC (real) casting process is the main or STMMA EPS foam sheet cut into small pieces and then bonded into the paint on the

required model → → → buried in the sand tap vacuum, casting → finished castings. This shows that can produce high precision,

smooth flat white mold model is behind the high-quality castings casting a critical first step.
To control a good white mold shape, first select the appropriate high-quality adhesive. In twenty years ago, just use our EPC

(real) when casting this new technology, there is not yet lost foam adhesive, to be imported from abroad, not only inconvenient

transportation, and spend a lot of foreign exchange to increase costs. To this end Beijing Jia Hua Tianxiang Technology Co., Ltd.

Professor Wang Peihua spearheaded a special adhesive EPC localization studies, and to overcome the difficulties and successfully

developed the first generation AB glue, the second generation of WPH-1 gel ( cold glue), HM-1 glue (hot glue), EPS-1 repair

ointment. Recently developed the third generation of JH-1 rubber, EPS-2 repair cream, EPS-3 Putty and so on. Filled a number of

special adhesive EPC blank.
Beijing Jia Hua Tianxiang Technology Co., Ltd. is the real lost foam casting Association Professional Committee members casting

unit, Professor Wang Peihua is cast in the lost foam casting Association of Distinguished Education and Training Committee,

senior professor and training materials prepared by the EPC Committee Editorial Board, Standardization Committee. Preparation of

a large number of textbooks, handouts, brochures and other information using technology and has been teaching for the course

knowledge of EPC adhesive as much as fifteen years, for many manufacturers to develop a lot of talent, many areas has become the

backbone of leadership.
Beijing Jia Hua Tianxiang Technology Co., Ltd. has been stood from the beginning to the present research and development of EPC-

specific first line of glue, and constantly develop new products, manufacturers and patiently answering and giving technical

support, but also special needs based on user requirements developed products to be We respect and praise.
Currently specializing in real research and development of EPC-specific glue only Beijing Jia Hua Tianxiang Technology Co., Ltd.

and Hangzhou Orbotech company.
2 lost foam adhesive must meet the following requirements
(1) EPS or EPMMA or STMMA good bonding surface wettability, so that glue can be continuous even started.
(2) non-corrosive foam sheet, non-toxic, non-polluting.
(3) bonding speed, high strength, will help the paint.
(4) curing adhesive stress and strain to be consistent with the foam board, not to look like shrinkage, warping, distortion.
(5) requires casting, the gasification full, launched a small amount, no increase in carbon.
3 Factors affecting the quality of adhesive
(1) the type of glue: adhesive of a wide range of complicated composition, a polymer glue, organic adhesive, inorganic rubber,

natural rubber, the contract adhesive, structural adhesive, non-structural plastic, thermoset rubber, thermoplastic rubber, hot

melt, solution plastic, pressure-sensitive adhesive and so on. In such a diversity of species, should be selected with C, H, O

and other elements of composition of polymer plastic, because of its high strength, and which can be at 600 ℃, the carbon

combines with oxygen to generate more CO or CO2 as the gas escaped If the oxidation combustion, the carbon-free, without leaving

residue.
(2) The adhesive properties of: bonding process is a complex physical and chemical, adhesive force is the source of many,

including bond strength, van der Waals forces, hydrogen bonding, electrostatic attraction interface, and other mechanical forces.

The strongest chemical bonds. The mechanical properties of adhesive on the \"line of force\" have a decisive impact on joint

strength. This is due to the different types of adhesive modulus, tensile strength, elongation and other mechanical properties

vary, resulting in physical and chemical processes, the joint of the stress distribution and stress concentration is not the

same.
In general, reducing the adhesive elastic modulus, increased elongation at break, glue joints will minimize the stress

concentration, and strength increase. However, the lower elastic modulus adhesive is often accompanied by a decline in its

cohesive strength, resulting in a decline in bonding strength. Thermosetting adhesive found in the study carried out with the

cure, peel strength increased, but up to a certain extent, the peel strength began to decline, so in order to achieve high peel

strength of adhesive joints, the adhesive must be elastic modulus and fracture elongation control in a certain range.
(3) the impact of bonding process: different types of glue, the bonding process is also different. Adhesive bonding process,

including methods, amount of glue, adhesive layer thickness and curing conditions.
① coating method: brush by painting, spraying, dipping, coating, wire coating, dispensing, etc., according to different plastic,

flexible use.
② amount of glue and layer thickness: different types of glue, the amount of glue is different, to be treated separately, layer

not too thick nor too thin, too thick, and will increase the amount of glue, not only increase costs, but also the opportunity to

layer defects increase, the thicker the layer, curing shrinkage stress generated when the greater, leaving the adhesive joint

strength decreased, but also increase the coke and gas evolution. But not too thin, too thin, and easy to lack of plastic, will

reduce the adhesive strength, but also increase the chance of sand, the layer thickness is usually controlled at 0.03 ~ 0.15mm or

so.
③ curing conditions: curing, including early access to some of the early first adhesive strength, so that the model does not

shift, then completely cured, the adhesive layer to achieve maximum strength.
4 suitable for lost foam bonding adhesive
Beijing Jia Hua Tianxiang Technology Co., Ltd. is the earliest developed the first AB glue, WPH-1 rubber, HM-1 rubber, EPS repair

ointment, 20 years have been widely applied in China, and received. Recently the company have a breakthrough, the latest

developed JH-1 rubber, WPH-2 glue, EPS-2 Putty, EPS-3 Putty series of new products.
(1) JH-1 glue: is our newly developed, the room temperature bonding adhesive, non-toxic, tasteless, non-flammable, not explosive,

low-carbon, environmentally friendly, launched a small amount of residual carbon less, particularly suitable for coating machine

can also be artificial coating, suitable for steel, cast iron, copper, aluminum and so on.
(2) WPH-2 gel: a servant room temperature, using the glue machine, high speed, high strength, launched less, less carbon residue,

suitable for steel, cast iron, copper, aluminum and so on.
(3) EPS-2 Putty: is the company\\ s first generation of EPS-1, following repair cream then developed a second generation of EPS or

STMMA repair surface defects, cracks products, low temperature resistance, good gasification, less carbon residue, to avoid RPM

can improve cast steel, cast iron, copper, aluminum and other casting surface finish.
(4) EPS-3 Putty: White mold surface for large and small defects and cracks repair, cold, heat, good operations, good

gasification, less carbon residue, avoid gravel, can improve the cast steel, cast iron, copper, aluminum and other surface

finish.
(5) EPS-1 repair cream: is the first developed in 2000, the first generation of EPS or STMMA white mold repair surface defects,

cracks of Putty, to avoid the gravel, improve casting surface finish.
(6) WPH-1 gel: is the company back in the 1990s, first developed the first generation of white mold at room temperature bonding

glue, light weight, use less, high strength, good gasification, suitable for casting steel, cast iron, copper, aluminum and so

on.
(7) HM-1 glue (hot glue): is the company in the 1990s, the first developed specifically for the first generation of white mold

quickly lost foam hot melt adhesive, the adhesive coating one side, immediately reach maximum intensity, especially the mouth

parts for plastic cap, suitable for steel, cast iron, copper, aluminum and so on.
(8) AB glue: Professor Wang is back in the late 1980s the first successful development of the first two-component adhesive white

plastic mold, the adhesive connection speed, high strength, but hard and brittle layer is required gasification temperature is

high, only for steel, cast iron, not for copper, aluminum.
The lost foam adhesive is completely Technology Co., Ltd. Beijing Jia Hua Tianxiang independent research and development, unique

intellectual property. . Association would like to thank the cast, the real and the lost foam technology committee colleagues and

friends over the years, the majority of user support and promote the use of the future will continue to work in accordance with

the recommendations of friends, demand, continue to develop research on new products!

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Casting of the three common industry problems

Posted on December 29, 2011 by admin

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stainless steel casting – China Manufacturer
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http://www.steel-casting-forging.com/stainless-steel-castings/

  Now, our precision casting factory in the country there are many, and are only developed in recent years. But the industry is

also problematic.

  The first casting industry, it is a steel casting high You Gaotou profit industry, or would not have so many casting

manufacturers to follow suit.

  The second person from the production and technical employment pressure can be seen casting a blind factory production began to

slump and shut down some nails, some precision casting factory underemployment.

  The third in the country since the development of precision casting time is relatively short, so the domestic level of

precision casting technology is uneven; learned some time ago some colleagues, including some reported price of Guangdong casting

method is not scientific.

  Casting is relative to the traditional casting process in terms of a casting method. It can be relatively accurate shape and

high casting accuracy. More common approach is: first make the necessary blank (can stay or not stay very small margin margin) of

the electrode, electrode corrosion and mold concrete to form a cavity.

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Five kinds of surface treatment of aluminum alloy die-casting method

Posted on November 14, 2011 by admin

1, aluminum phosphide

By using SEM, XRD, potential-time curve, changes in membrane re-examined in detail and other methods of promoting agents, fluoride, Mn2 +, Ni2 +, Zn2 +, PO4; and Fe2 + and other effects on the process of aluminum phosphide. Studies have shown that: Guanidine nitrate with good water solubility, low dosage, rapid film-forming characteristics of aluminum phosphate is an effective accelerator: fluoride can promote the film, increasing film weight, grain refinement; Mn2 +, Ni2 + can significantly grain refinement, the phosphate film uniform, dense phosphate coating and can improve the appearance; Zn2 + concentration is low, not film or the film is poor, with the Zn2 + concentration, membrane weight increase; PO4 content of the phosphate coating greater impact on weight and improve PO4. Content of the phosphate coating weight increased.

2, the aluminum electrolytic polishing process of alkaline

Polishing solution for a system of basic research, compared the corrosion inhibitors, viscosity agents on the polishing effect, succeeded in getting a good polishing effect of alkaline solution system, and for the first time been able to reduce the operating temperature, extended solution life, but also to improve the polishing effect of the additives. The results show that: in the NaOH solution by adding appropriate additives to produce a good polishing. Exploratory experiments also found that: NaOH solution with glucose under certain conditions, the DC constant voltage electrolytic polishing, the aluminum surface reflectivity can reach 90%, but also the experimental instability, pending further study. Explore the use of DC pulsed electrolytic polishing in alkaline conditions, the feasibility of polished aluminum, the results show that: the use of pulsed DC electrolytic polishing to achieve constant voltage electrolytic polishing of the leveling effect, but the leveling is slow.

investment casting suppliers

3, aluminum and aluminum alloy environment-friendly chemical polishing

Developed to determine the phosphorylation of a sulfuric acid-based liquid chemical polishing of new environmentally friendly technology, to achieve zero emissions of NOx and similar technologies to overcome the past, the existence of quality defects. The key is new technology-based solution to add some special effects to replace the nitrate compounds. This will require firstly the three acids on aluminum chemical polishing process of analysis, in particular, focus on the role of nitric acid. Chemical polishing of aluminum nitrate in the main role in the inhibition of pitting corrosion, improve polishing brightness. Phosphate with sulfuric acid in a simple chemical polishing experiments, that in sulfuric acid phosphate should be added to the special material to inhibit pitting corrosion, reduce overall corrosion, and must have good leveling effect of light

4, aluminum and its alloys Electrochemical Surface Treatment

Aluminum and its alloys in a neutral system, the formation of anodic deposition of amorphous class of ceramic composite conversion coating process, performance, morphology, composition and structure, a preliminary study of the film-forming process and mechanism. Process results show that Na_2WO_4 neutral mixed system, the control film to promote the concentration of 2.5 ~ 3.0g / l, the concentration of network synthesis Remover 1.5 ~ 3.0g / l, Na_2WO_4 concentration of 0.5 ~ 0.8g / l, peak current density of 6 ~ 12A/dm ~ 2, weak mixing, you can get a full uniform, gloss and good series of inorganic non-metallic gray coating. The film thickness of 5 ~ 10μm, micro-hardness of 300 ~ 540HV, excellent corrosion resistance. The neutral system for the aluminum alloy has good adaptability, rust-proof aluminum, wrought aluminum alloy on a variety of series can be a better film.

chinese precision casting

5, YL112 aluminum alloy surface treatment technology

YL112 aluminum is widely used in automobile, motorcycle structural parts. Required before the application of the material surface treatment to improve its corrosion resistance, and the formation of a layer of organic coating is easy to combine with the surface layer, in order to facilitate the subsequent surface.

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Anti-carburizing low-carbon steel casting surface coating research and application..

Posted on November 10, 2011 by admin

Abstract: A new anti-carburizing low-carbon steel casting surface coating composition, production technology, performance characteristics and application examples. New anti-

carburizing paint can not only effectively reduce or eliminate low-carbon steel casting

surface by carbon, but also so that the coating is easy to peel, get no sticky sand, non-

porous, smooth surface of the casting.

Key words: low carbon steel; cementite; zircon powder; coating

CLC number: TG156 Document code: A Article ID :1000 -8365 (2010) 12-1551-04

Adopt resin sand process to produce low-carbon steel casting

s, steel castings prone to surface carburization shortcomings.

Carbon steel castings will reduce the cross-section shrinkage, elongation, deterioration of ductility and toughness. Low carbon steel casting

surface can lead to increased

hardness increases, machining difficulties, welding performance and other issues. Carbon-carbon stainless steel casting surface will increase its corrosion resistance decreased.

Anti-carburizing low-carbon steel castings is a research hotspot in recent years.

lost wax casting

Low carbon steel casting surface by the main causes are: liquid steel casting and solidification process, the resin sand mold (core) work surface and paint resins and other

organic matter in the thermal decomposition products as CO, CO2, CH4, and a small amount of H2, there is a certain amount of pyrolytic carbon; these carbon by pyrolysis of

sand (core) / casting interface diffusion and penetration to the casting surface, leading to the casting surface by carbon.

Inferred: the sand (core) work surface coating layer can be formed at high temperatures a certain thickness of the dense sintered vitreous coating, for the prevention of low-

carbon steel surface by carbon should be a simple and effective method. To this end, we carried out anti-carburizing low-carbon steel castings for the development and

application of paint.

A low-carbon steel casting anti-carburizing paint composition design

New low-carbon steel castings mainly by anti-carburizing refractory coating binder, binder, solvent, dispersant and other additives SC (sintering additives, defoamers, wetting

agents, water-reducing agent, curing agent, leveling etc.) form.

1.1 fire-resistant powder

Low-carbon steel castings requires not only anti-carburizing paint coating sintering and sand requires a good anti-sticking effect. Accordance with the “anti-sticking coating

sintered strip of sand,” the theory, powder refractoriness not too high, the main consideration should be given its own or with fire-resistant powder coating and sand and between

the other components of the reaction between the substrate sintering at this time point close to the requirements of the sintering temperature of pouring alloy casting, the casting

process can generate a new phase or produce mild sintering, or completely molten, state or ceramic coating layer was the high viscosity of the glassy state, can resist the

penetration of liquid metal, and cooling easy to peel and after casting, get smooth surface of the casting, this is called sintering stripping paint coatings. Sintered refractory powder

coating stripping is generally complex, that is, from a variety of liquid metal casting in sintering temperature of each powder composition in a powder can be added on the basis

of the corresponding flux (or oxidant) to produce moderate to powder sintering and melting.

Accordance with the “anti-carburizing sintering coating” theory, sintering can paint just as the sand (core) layer of the working surface of the shield to block from the sand mold

(core) and C react with the liquid metal, or by gas or solid phase diffusion into the liquid metal, thus avoiding the steel castings produced by C and other defects.

Obtained at a high temperature high density, good shielding coating methods are:

(1) the use of sintering temperature lower than the metal pouring temperature 50 ~ 100 ℃, can be mild sintering of the refractory to form a dense coating.

(2) coating with refractory aggregate into some of the flux composition, moderate temperatures in the pouring melted to form a seamless layer of dense vitreous.

(3) use of fire-resistant fine-grained powder. General requirements powder 325 mesh particle size can all be over (40μm), in which

20% is appropriate.

alloy steel casting

Based on the above analysis, in order to simultaneously ensure low-carbon steel sand casting anti-carburizing and anti-sticking double effect, we use zircon powder as the

coating of fire-resistant binder.

The melting point of zircon powder with different impurities contained in the 2190 ~ 2430 ℃ fluctuated, but when in 1540 ℃ thermal decomposition of ZrO2 and SiO2, and

began to sinter (SiO2 of low melting point), has a certain self-sintering. Therefore, the sintering temperature of zircon sand and melting temperature between a wide temperature

range, which is conducive to it resulting in a sintered metal stripping liquid pouring, the casting surface is easy to clean. Zircon powder has been almost no infiltration of molten

metal or metal oxide, will help prevent the intrusion of liquid metal casting porosity, sand sticking to reduce mechanical defects. In addition, zircon powder under high

temperature performance is neutral to slightly acidic, and basic slag reaction is slow, chemical stability, high thermal, chemical sticky sand to prevent defects.

Zircon powder should have a reasonable size distribution. Particle size is too coarse, rough coating layer, and the suspension and the permeability is not good; too small, the

coating crack resistance is poor. The particle size distribution should be in the appropriate size range was greater dispersion in order to take full advantage of the thickness of the

particle interaction mosaic effect, be a dense coating of liquid metal to improve its anti-permeability and anti-carburizing capabilities. We use 325 mesh zircon powder as the

coating of the refractory base material,

Which the fine particles less than 10μm diameter greater than 15%. According to the structure of the casting conditions (weight, thickness, etc.) and production conditions

(material, pouring temperature, etc.) to adjust the sintering temperature of zircon sand range, plus also the coating amount of a flux. The flux after more than 1000 ℃ thermal

decomposition, resulting in a high-temperature stability, good chemical reducing gas. This reducing gas to avoid sand (core) / carbon interface material and casting liquid steel

contacts, to prevent the liquid interface layer absorption of carbon steel, which effectively reduce or eliminate the casting surface carburization.

1.2 binder

Cast coating is necessary to have a certain temperature strength, but also has good high temperature strength. According to this requirement, the binder should be used to heat the

organic binder and inorganic binder low-temperature composite application technology. However, the organic binder is generally carbon, the carbon bound to high-temperature

pyrolysis. Therefore, to ensure a certain temperature strength of the coating under the premise of the coating should minimize the amount of added organic binder, multi-use high-

temperature inorganic binder.

1.3 Solvent

Alcohol-based paint solvents commonly used ethanol, but ethanol combustion of common industrial poor in the winter, the coating does not burn completely. In order to

improve combustion performance, reduce production costs, can be added to methanol as an auxiliary solvent, but because of the human optic nerve there is a strong irritant, and

should not be more. Water-based paint solvents with ordinary tap water.

1.4 dispersed suspension stabilizer

We use a special aluminum silicate clay-based materials, the application of colloid chemistry of electrostatic steric dispersion stability theory, and in special composite

polymer electrolytes as dispersant and auxiliary has a variety of comprehensive reform of its appendages of treatment, develop new water-based and alcohol-based composite

dispersed suspension [1] (which was in 1998 obtained the national invention patent), respectively, for the production of water-based and alcohol-based coatings, has achieved

remarkable results. SC has the following characteristics of the new decentralized.

(1) use alcohol-based composite dispersed suspension without xylene lead to higher carbon content, can be activated only water, but the expansion in ethanol bentonite

considerable value.

(2) refractoriness up to 1650 ~ 1670 ℃, 300 ℃ higher than the bentonite above, fire resistance of the coating without adverse effects.

(3) 0 ~ 1200 ℃ shrinkage rate of 12.1%, only bentonite 0 ~ 1200 ℃ Shrinkage of 2 / 3, so that the coating will not crack defects.

(4) refractoriness and significantly improved crack resistance, to the maximum allowable in paint in the added amount can be as high as 12% (accounting for refractory powder

weight), adding the amount of range.

carbon steel casting

(5) play the role of the main components of dispersant coating also has the role of high-temperature binder; play the role of SC is also a major component of low-temperature or

high temperature adhesives, all have multiple roles.

After dozens of recipes for performance testing test paint and pouring comparison test, a new type of preferred anti-carburizing low-carbon steel casting surface water based

zircon powder and alcohol-based coating the best ratio range as shown in Table 1.

2 low-carbon steel casting anti-carburizing paint production technology and equipment

Currently there are paint processing equipment mixers, rolling machine and ball three. Mixers and fire-resistant powder paint rolling machine refinement of the role of weak,

poor mixing, processing time of up to several hours or even 10 hours, mixing paint and other suspension and brushing process performance is poor. Refinement of the powder ball

better, but not continuous production, and processing time is still for many hours, production efficiency is low, not suitable for mass production.

Supplemented by pre-mixing of the colloid mill mixer processing technology, is far more satisfactory paint production process. Stir the paint after the initial gear pump into the

colloid mill, due to the colloid transfer between the teeth and fixed teeth (the gap between 60μm or less) relative to high-speed rotation (speed up to 3000r/min), paint by the

strong suction , shear, friction and the role of high-frequency vibration (gear pumps also have these effects), can be effectively mixing, homogenization, dispersion and refinement,

and to generate new active surface of the powder (activated), to obtain excellent suspension, brushing, permeability and adhesion strength process performance.

With this mixer – Gear pump – the preparation of coating colloidal system, you can relax on the refractory raw material powder fineness requirements, but also mechanized

continuous production, and mixing short cycle, high efficiency (over traditional rolling machine equipment to improve several times ten times).
3 anti-carburizing low-carbon steel castings the main properties of coatings

Under the conditions of industrial production in the preparation of new low carbon steel casting surface carburization zircon powder against water-based and the main

properties of alcohol-based coatings are shown in Table 2.
New anti-carburizing water-based paint in almost no precipitation within 5h, 8 ~ 24h suspension of up to 98% ~ 99%, 1000 ℃ when the gas evolution is 16mL / g or less. New

anti-carburizing when the alcohol-based coating suspension at 8h to reach 95%, 1000 ℃ when the gas evolution is 19mL / g or less. Two kinds of coating and rapid heating at

1200 ℃ for 2min, when not crack, brushing and thixotropic index have a higher rate.

Paint brush index, is paint in the low shear rate (6r/min) and the apparent viscosity under high shear rate (60r/min) under the apparent viscosity ratio. It is characterized by a

coating of shear-thinning (or thickening) of, which is thixotropic structure. Brushing the higher the index, the better that paint brushing (brushing and effort, and good resistance to

flow, easy coating thickness).

Thixotropic coating rate, is the apparent viscosity η with mixing paint time rate of change, that time thixotropy. The calculation of (η0.5-η10) / η0.5 × 100, respectively, which

η0.5 and η10 paint stirring speed in 6r/min rotation 0.5min and 10min, the apparent viscosity. Thixotropic rate is higher, the better leveling coating, the greater the dilution range,

brushing of the better also.

4 Low carbon steel casting application effect of anti-carburizing paint

New low-carbon steel casting surface anti-carburizing zircon powder and alcohol-water-based paints, Wenzhou, in Zhejiang with a valve manufacturing company from furan

resin sand process to produce hard carbon steel parts to achieve a satisfactory result in the plant-volume applications more than a year.

The casting plant for the high-pressure check valve casting, made of type 304 and 316L stainless steel (U.S. ASTMV743 standard), single-piece weight 600kg, minimum wall

thickness of 50mm, maximum thickness 92mm. Modeling system using alkaline phenolic resin sand core; paint brush 3 times, respectively, alcohol, alcohol-and water-based,

alcohol-based paint before brushing twice ignited immediately after drying, the first three times backward brushing water-based paint bake oven dry for several hours; total

coating thickness of about 0.8 ~ 1.5mm.

Type 304 stainless steel high pressure valve 4.1 application results

304 (0Cr19Ni9) stainless steel high pressure valve of the original carbon content of molten steel is 0.06% ~ 0.08%, after pouring the casting surface layer requires control of

carbon content of 0.08 percent.

New low-carbon steel casting surface anti-carburizing zircon powder coating production and application results show that the permeability of the new coating, flow resistance

and crack resistance are well-coated, high strength, gas evolution is small; casting box to play when coated Most can be stripped into the film layer, smooth casting surface, sticky

sand and almost no pores, substantially increased the casting clearing efficiency, saving energy, reducing the labor intensity.

Table 3 lists the alkaline phenolic resin at the surface of the sand core, using the paint and coatings company in Shanghai production of zircon powder coating high-pressure

check valve type 304 stainless steel castings, in different locations of the chemical composition of spectral analysis results. From the table, when using this coating, the surface

layer of castings in carbon content of 0.074% controlled about 11% of the maximum rate of increase of carbon, carbon layer thickness ≤ 0.7mm, anti-carburizing effect is

remarkable; the use of a company in Shanghai zirconium British powder coating, casting surface up to 0.112% carbon, does not meet the production requirements, the highest

growth rate of 70% carbon, about seven times the paint, carbon layer thickness> 1.0mm; two kinds of paint on the casting of other composition had no effect.

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US-style health products recommended: KGW horizontal air conditioning units

Posted on November 10, 2011 by admin

Product Name: KGW horizontal air conditioning units

Product Category: Air processor

Product parameters

The company s air volume air handling units covering 1000m3 / h ~ 120000m3 / h, cooling capacity covered 10KW ~ 1138KW, heat capacity ranging from 12KW to 1650KW.

Production processing unit appearance, stable performance, high heat transfer efficiency, quiet running unit.

precision investment castings

A framework for anti-cold bridge

2mm thick aluminum alloy profiles using the bridge against the cold plastic cast to form a 3D framework structure, mechanical strength, in line with CEN2 level standard (used

in the design conditions, the deformation is less than 4mm / m). Inside and outside the bridge against the cold aluminum frame with a unique profile of PVC profiles cut off cold

bridge (pictured), is superior insulating properties. Framework for the LD6032 high-quality aluminum profiles extrusion, surface oxidation treatment, and then spray to make it

look more perfect, more resistant to corrosion.

2 panel

Double-layer “sandwich” panel thickness of 25mm, 0.5mm thick are used inside and outside the mining color plates, folder within the polyurethane foam density of 35kg/m3 Mu

plastic, PVC plastic frame with decorative edge of the bag, cut off between the double-panel heat transfer, heat transfer coefficient panel K ≤ 0.02W / (M2.K).

Three tube

All coils are the cooling load of the application of professional design software to optimize the design, according to different conditions with different diameters and wall

thickness, the unit can not only improve energy efficiency, better meet customer cost requirements.

Brass, fin are connected with mechanical low pressure rise, tight, high heat transfer efficiency. Imported high quality aluminum fins, the OAK equipment after two flange shape.

Catchment are threaded, with drain valve and release valve. Coil test pressure of 2.5MPa, the design pressure of 1.5MPa.

Fin with hydrophilic and common aluminum foil optional.

chinese precision casting

4 water dish

Water tray with steel and stainless steel. Steel water dish were embalmed by electrostatic powder coating. Water tray with a support rail, easy to coil out. Are equipped with a

certain slope water dish, and is under water, can guarantee completely drained condensate, which is called “dry water dish.”

5 fans, motors

Fans of imported or double inlet forward curved centrifugal fan after the bend, fan inlet aerodynamic performance requirements according to the design, the impeller have been

static and dynamic balance test station state, stable performance, low noise.

Motor is totally enclosed fan-cooled three-phase squirrel cage induction motor, using the latest theory of the electromagnetic design to optimize the design of export support

with a three-phase asynchronous motors, power level according to IEC standard and DIN42673 standards. Motor is class F insulated, enclosure protection rating of IP54, cooling

method is IC0141.

6 pulley, belt

With European pulley, embedded sleeve, demolition, installation easy, fast-sensitive. Imported belt flat belt, toughness, durability, service life of up to 40,000 hours, flat belt

for the B band, versatility, replacement and maintenance.

lost wax casting supplies

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Roughness tester is widely used in the bearing industry to promote the development of the industry

Posted on November 10, 2011 by admin

Roughness instrument known as surface roughness meter, meter surface finish, surface roughness tester, roughness tester, roughness meter, roughness tester and many other names. NDT110 roughness tester is Kai Dake new generation of pocket-sized portable device surface roughness tester. It has high accuracy, wide measurement range, easy to operate, portable, stable, etc., can be widely used in various metal and non-metallic surface finish testing, the instrument is the integration of the sensor host pocket instrument, with handheld, it is more suitable for use in the production site. Shape with pull aluminum mold design, durable, anti-electromagnetic interference capability significantly, in line with current design trends.

Features:

DSP processor for high-speed data processing and calculation, measurement and computation speed greatly enhanced. OLED LCD display screen using the popular, high-brightness, no viewing angle, wide temperature, suitable for all occasions.

casting factory

Lithium-ion rechargeable battery, can work long hours, no memory effect, can be operated while charging while working, charging time is short, long battery life.

Using a common USB interface for charging and communication. Using a dedicated charger or computer USB port for charging, quick and easy.

Dot-matrix liquid crystal display, the interface prompts informative.

Real-time monitoring of lithium battery and display, the user charge and a timely reminder of the progress with charging tips.

Auto power off function and low-power hardware and software design of the instrument long working hours, for a variety of field use.

Sensor probe has a protective door, effective protection of the sensor probe to ensure the accuracy of measurement.

Currently roughness tester applications are:

First, the mechanical processing and manufacturing, mainly metal-working manufacturing. Roughness tester is to detect the first generation of surface roughness and machining parts born. In particular stylus roughness measuring instrument more suitable for hard metal texture surface detection. Such as: auto parts processing and manufacturing, processing and manufacturing of mechanical parts, and so on. As long as those involved in processing and manufacturing industries to the workpiece surface quality, roughness tester for detection applications is essential.
Second, non-metal processing and manufacturing, with advances in technology and development, more and more applied to the processing of new materials, such as ceramic, plastic, polyethylene, etc., are some of the bearing is made with a special ceramic material processing , there is the use of valve, etc. made of polyethylene material processing. These materials are hard, some applications can replace the piece of metal material in the production process also needs to detect the surface roughness.

Third, with the roughness meter technology and features constantly strengthened and improved, and the depth of the promotion and application of more and more industries will need to be found in the detection of roughness, in addition to machine manufacturing, the electricity, telecommunications, electronics, such as switches on the coupling, integrated circuits and semiconductor production process also need to finish the assessment, even in people s lives using the stationery, tableware, human tooth surface roughness of the test should be used.

The following roughness tester according to the specific industry segment with its application:

1, auto parts manufacturing and processing

2, processing and transmission of mechanical parts mechanical parts including: bearings, fasteners, stampings, screw set screws, rack and pinion, cam systems, couplings, clutch, hydraulic equipment, gear, motor, tune speed motor.

precision investment castings

3, metal processing equipment and machine tool accessories, features

Metal processing equipment, including: lathes, milling, drilling, grinding, punching, sawing machine, EDM machine, wire cutting, laser processing machine, chamfering machine, rapid prototyping machine, short sets of horizontal axis, CNC strong, dedicated forming series, automatic tapping machines, drilling tapping compound machine, Yan mill, engraving machine, testing machine, dedicated testing machine.

4, process equipment

Carbide cutting tools, gear cutting tools, thread cutting tools, tooling systems, ceramic cutting tools, grinding tools, research tools, grinding machines, wear parts, fixtures, pneumatic fixtures, hydraulic fixtures, standard mold, mold material, electric / pneumatic tools, hand tools.

5, general machinery and metal forming equipment

Lifting equipment, air compressors, valves, pumps, fans, refrigeration equipment, rolling machine, cold rolling machine, marking machine, riveting machine, wire drawing machine, metal products.

6, surface engineering process

7, metallurgy smelting, rolling and forging equipment

Cold-rolled sheet, the original tin plate, aluminum alloy, stainless steel, cold rolled workpiece, rolling roller (made of copper, aluminum), chilled cast iron mirror roll, calendar roll.

8, pneumatic, hydraulic components and pressure vessels

9, die casting, precision manufacturing

Plastic mold, stamping mold, cover the body mold, die casting mold, melting equipment, foundry equipment, iron, aluminum castings, non-ferrous sand castings, carbon steel castings, steel castings,alloy steel castings,precision castings.

precision investment casting

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Bin Chang Machinery to provide you with professional surface treatment and coating equipment

Posted on November 10, 2011 by admin

Bin Chang Machinery Co., Ltd. Zhangjiagang City, is specialized in surface treatment and coating equipment, research, development, manufacturing, services, emerging as one of the potential scientific and technological innovative enterprises. Our products are widely used in aerospace, petroleum, chemical industry, shipbuilding industry, automobile industry, marine engineering, bridge engineering, machinery, containers, military, electric power, stone and glass sculpture and other areas!

sand casting

Shops train: Bin Chang Machinery Co., Ltd. Zhangjiagang City

BC blasting machine

Product Features:

1. Blasting machine with rotary characteristics;

2. Special rail carts designed to lift heavy parts on top, very convenient, labor-saving;

3. Cart wheel, according to customer requirements reinforcement;

4. According to customer needs, choose manual or automatic turntable.

5 can be customized according to customer demand

Scope: all types of heavy workpieces blast: as all kinds of mold, computer shell, heavy beat

Power mode and other large parts of the blast.

valve castings

Product parameters:

Blasting machine working chamber size (mm): 900 × 700 × 650; Power: 220V50Hz;

Machine lights: 220V13W energy-saving lamps; Machine weight: 320kg; turntable bearing: 150kg;

Separator motor: 220V50Hz550W; separator air flow: 8.5 m3 / min;

Compressed air source :2-8bar (kg / c ㎡)

Non-standard abrasive blasting machine

Product Features:

1, this model is shaped mold or large heavy parts of the design of special machines. Trolleys and wheel installation activities, the operation on the workpiece when the only car on the turntable, and then push into the machine to engage in spray sands operations, is very simple effort

2, the timer can be installed to prevent the glass from moisture. To follow customers workpiece size, weight, shape-made turntable rotate 360 ??°, to install electric speed dial, speed up the processing speed, easier to control the sand quality.

3, available cylinder door for easy access to the workpiece. Mining practices cyclone bucket, siphon blasting efficiency is generally about 1.5 times. Automatically recycled sand material used to improve the sand timber recycling rate, transaction control sand material particle size. This machine is suitable for heavier parts of the blast.
BC-turntable blasting machine

The main technical parameters:

①, supply voltage: 380V50Hz three-phase five-wire system;

②, the required air pressure :2-8bar (kg / c ㎡) flow 10-12m 3 / min;

③, high pressure air: power, 11KW; wind, 3619m 3 / h Total pressure: 7109Pa;

④, sand materials: glass beads, steel shot, steel grit, quartz sand, silicon carbide, etc.;

⑤, dust removal method: pulse filter dust.

Scope:

For disc-type, cylindrical type, a square piece of sand inside and outside surface of the mass, such as handicrafts, glass shade, non-stick, flashlight, pan, stainless steel sink, communications equipment and so on.

Features: environmental protection, and stable performance

1 large intermittent rotary turntable, a small turntable rotation;

2 according to the shape of the workpiece, adjusting the position of each gun;

3 can be fixed gun blasting can swing, swing speed and a small gun turret rotation frequency can be adjusted
Mechanical blasting room

Products:

Heavy-duty blasting room is customized according to customer needs, and its dimensions according to customer needs. Is a large sandblasting room. The main components of the studio, blasting systems, dispatching systems, abrasive recovery system, dust removal systems, control systems, lighting systems and other components. The steel parts, welding parts and castings and other large-scale surface rust in the ideal equipment.

Product Features:

Manual operation is used in blasting.

Filter dust will solve the dust generated by blasting operations on the environment pollution.

open die forging

Automatic abrasive recovery gathered by cell separator floor automatic sorting and storage, minus the labor intensity and improve the utilization of abrasive.

Environmental impacts from production and work.

Blast room recovery mode for the energy recovery (cell floor) or mechanical recycling.

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