degreasing equipment

Degreasing process is a process with the characteristic of metal injection molding technology, according to the different way of working equipment, degreasing equipment can be divided into the batch of material type degreasing furnace, catalytic degreasing furnace, for metal injection molding using in practical production more paraffin base binder system, thermal degreasing is the most commonly used, and most important degreasing method, catalytic method was advanced degreasing degreasing is relatively new, but its have special request for feeding, the following focuses on industrial production the commonly used thermal degreasing furnace, solvent degreasing furnace and catalytic degreasing furnace.

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metal injection molding process similarities

metal injection molding process is made by powder metallurgy process and plastic injection dawn technology combination of new technology, metal injection molding process and plastic injection molding technology of the biggest similarities is metal injection molding and process, the metal injection molding of plastic injection molding or technology can be used after modification, for by mixing metal powder and binder, with proper viscosity and good flow properties of feed, heated to a certain temperature in the injection moulding machine, make its melt into liquid viscosity good material, and then imposing certain temperature and pressure, the injection mold in the molding process, so that it can make traditional powder metallurgy method can't make the shape of complex parts.

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mixing equipment

Is the purpose of the mixed layer on the surface of powder coated adhesive, destroy the reunion, the binder and the powder particles uniformly distributed in the whole feeding, mixing is the first step of the MIM process and important working procedure, because the defects in feeding cannot eliminate by the adjustment of the steps behind, so the quality of the feed is key.For mixing the powder and binder content in all parts of the feeding uniform, at the same time can reduce the time needed for mixing feeding, maximize the powder in the binder content, avoid the binder and the powder of two phase separation, the phenomenon such as powder segregation in the binder, need according to the nature of the material selection of different mixing equipment and make reasonable mixing process.

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MIM process equipment

equipment is an important technology of MIM into the industrialization of survival foundation and material along with the constant development of MIM industry, plastic injection molding industry, powder metallurgy and other industry equipments are constantly being modified to use, at the same time a large number of unique professional equipment suitable for MIM technology are constantly emerging, the correct choice and in the process of mastering the MIM production all sorts of equipment, to improve the yield and quality of products, raise Labour productivity, save manpower and energy, reduce costs, improve working conditions and eventually promote the development of the industrialization of the MIM is of great significance.

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sandblasting surface treatment

Future make better surface finish, can be achieved by spray gun will be the workpieces grinding fluid high-speed jet to finishing processing, achieve the purpose of to act the role of cleaning the surface of parts and light, colleagues, because the sand blasting process to give the product surface must be prestressed, to improve the fatigue strength of products, liquid sand blasting is now widely used in metal injection molding products, it is not applicable to special precious machine can obtain high degree of finish of complex shape parts, the processing surface without scar, surface hardening, can improve the parts of wear resistance, corrosion resistance and fatigue resistance, strong adaptability.

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sandblasting surface treatment

Future make better surface finish, can be achieved by spray gun will be the workpieces grinding fluid high-speed jet to finishing processing, achieve the purpose of to act the role of cleaning the surface of parts and light, colleagues, because the sand blasting process to give the product surface must be prestressed, to improve the fatigue strength of products, liquid sand blasting is now widely used in metal injection molding products, it is not applicable to special precious machine can obtain high degree of finish of complex shape parts, the processing surface without scar, surface hardening, can improve the parts of wear resistance, corrosion resistance and fatigue resistance, strong adaptability.

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metal injection molding binder removal

Metal injection molding using a large amount of binder, giving powder good liquidity, can use its secure complex shape by injection molding products.Binder removal after the need for sintering, sintering and common metal injection molding powder sintering basic similar, but the green density is small, the product in the process of sintering shrinkage is big, the size change of greater risk, more prone to the same batch of sintering product size, so the control accuracy is more important and difficult, at the same time, as a recent purification forming technology in injection molding and product after sintering basic without other auxiliary processing, so to understand and solve the problem in the sintering process and sintering process control in the dimensional accuracy is particularly important.

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sintering metal injection molding

metal injection molding after sintering, the future to meet the requirements of customers, sometimes need to surface finishing process, the sintering products such as surface finishing and deburring, round, and brightening.Application of planetary processing principle, the pieces of a certain number of artifacts, grinding, water and abrasive, added to the roller, the volume of the cylinder volume 40% - 40%, application of ceramics, alumina, aluminum alloy, aluminum alloy ceramic grinding block on the surface of the irregular parts processing edges and corners, deburring, chamfering, flash, oxide skin, rough cast batch processing, can improve the finish 2 - level 3, rough after grinding can improve the parts precision grade 1 or 2, chip removal process before leaving the establishment and one-time whole sintering after the flash light, to improve the surface contact fatigue strength of parts.

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surface hardening

many metal injection into steel parts after surface hardening heat treatment, for iron nickel alloy, surface hardening more meaningful, after proper heat treatment, can make the parts department has good toughness, surface with high hardness, to form the surface of high hardness, put the billet in high sugar content of heat in the atmosphere such as methane, another approach is to carbon and nitrogen.

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heat treatment

Many metals last an important heat treatment process is the simplest method is the annealing heat treatment, it is billet reheating molding that high temperature to remove stress and homogenization of alloy composition, heat treatment is a concern in cooling rate and the relationship between the annealing temperature, rapid cooling after quenching, usually used for a medium carbon steel for the performance of the high hardness.It can be 1000 degrees by quenching in oil or water, get martensite.Different heat treatment can be formed in the steel micro facies, martensite was formed by steel cooling is blocked, it is a one phase.

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the high hardness of the application of martensite

Martensite and high hardness application in wear parts, is of great practical value, due to the high strength martensite, usually easy to form a brittle steel, so, at a moderate temperature of billet reheating forming is called tempering heat treatment method, it can eliminate the quenching stress, makes part of martensite can be obtained through the quenching hardness reduced some, get toughness good micro facies, tempering temperature is 180-180 degrees, because carbon is contained in martensite, with burning the microstructure of the forward part of ferrite and cementite phase.

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metal injection molding and injection process

metal injection molding production success depends on the accurate uniform control of the products, to ensure the dimensional change from one product to another product and can be repeated, caused by injection to poor control of the process of change in sintering stage is difficult to correct, in the stage of sintering, the situation is usually enlarge the difference between the part and part, the loss of dimensional accuracy is often erroneously think is the problem of sintering, as long as appropriate to control the sintering temperature, sintering can get the final size of the uniform, so that when the size control problems, before the big change of sintering process is a good idea to look at the injection process.

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MIM sintering problem

Sintering problem caused by one of the most important direct consequence is to make the product size change and affect the final size of the product accuracy, in the early days of the MIM technology development, the deformation and dimension precision of products is not high, once become the key factor of the MIM technology industrialization, the MIM a process with the final when sintering, the density will produce large volume shrinkage, dimension change is very big, sintering the need for performance, need to control the density of sintered body, magazine content and organization, and its composition, density change is bound to affect the size and dimension precision of products.

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main cause of deformation of carbide sintered MIM

MIM of cemented carbide sintering deformation include: the main reasons for forming billet density is uneven, imbalance of carbon concentration, uneven temperature sintering process.On this basis can make control MIM model of cemented carbide vacuum sintering deformation 筪 via optimization of MIM process of the preparation of tungsten carbide products minimal size deviation plus or minus 0.02 mm.

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MIM carbide skimmed billet

MIM carbide skim billet usually has about 60% of the relative density, relative density of the final product will reach 100%, compared with the traditional moulding and sintering, the MIM sintering process with greater contraction.Therefore, MIM skim sintering on the densification of the billets, dimensional accuracy and conformal, internal organization structure of the control more difficult.Factors that affect the MIM sintering include powder particle size, shape size and shape, temperature, time, atmosphere, powder loading capacity, etc.

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the MIM iron base alloy

MIM iron base alloy is refers to the use of the preparation of metal injection molding for iron base (iron content is in commonly 90% - 98%), add a certain amount of copper (Cu), nickel (Ni), molybdenum (mo), chromium (Cr), manganese (Mn) and control of the elements such as carbon (C) content and composition of the alloy system products.The MIM iron base alloy is a kind of structural material with excellent properties of sintering state has good elongation (5% 25%).Carbon content is higher than 0.3% (mass fraction) of iron base alloy after heat treatment can achieve high strength (mpa), 1200-1500, relative density can reach above 97%.The most widely used with Fe - alloy system.

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316l stainless steel powder system

316 l stainless steel powder alloy powder system, the original system of alloy powder is a kind of uniform system of a single group, in this system is composed of uniform, but there are constituent fluctuations, or some group yuan exists partial poly (microscopic level) to form a high energy region, especially in the grain boundary and interdendritic, when reaching a certain temperature (above the solidus temperature), these areas are preferred melt flowing liquid phase in the grain boundary extension formation, make the particles into grain, grain activity is bigger, easy to implement rearrangement movement, get a higher degree of densification.

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metal injection molding of stainless steel

Now the most widely used metal injection molding of stainless steel 316 l stainless steel and 17 - PH stainless steel, 316 l stainless steel is a kind of good structural material, has good comprehensive mechanical properties, with the traditional moulding and sintering of powder metallurgy technology can produce stainless steel, but its density is low, the existence of the pore reduced mechanics, corrosion resistant, apparent, such as performance, and is limited to a simpler shape parts, thus restricted its development, industrial scale production of MIM stainless steel parts size accuracy + / - 0.3% ~ 0.3%, generally do not need to subsequent machining, density can reach above 95% theoretical density.Mechanics, corrosion resistant performance and so on, the apparent and molten stainless steel forging.

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the performance of the MIM316L stainless steel

MIM316L stainless steel performance depends largely on densification degree of high and low, and the degree of densification was mainly affected by chicken process, including sintering atmosphere, sintering temperature and holding time.MIM316L stainless steel was highly sensitive to the sintering atmosphere so the atmosphere is to control the alloy densification and performance of an important factor.316 l stainless steel is very sensitive on sintering temperature, and sintering temperature change a few degrees, sintered density can change 10%, shrinkage rate can be changed by about 3%, and the shrinkage rate in different direction.

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the sintering of metal injection molding

Metal injection molding of sintering and general powder metallurgy sintering process is similar, but the metal injection molding using a large amount of binder, the forming of billet density is low, the binder is removal before sintering, so injection molding billet sintering is a bit similar to apparent sintering, the sintering process can produce larger shrinkage, although the contract is our main purpose of the sintering, but at the same time the size change has led to distortion, to maintain high precision needs to be controllable and uniform sintering shrinkage caused by the evolution of the microstructure is a main factor of product performance.

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metal injection molding billet

After injection of billet in the binder is removal, sintering is a necessary step, sintering densification is usually appear in the sintering temperature is close to the material melting point, a single atom by solid or liquid to make particles grow up material movement, the movement of atoms intensity is proportional to the temperature increases.So, in order to realize rapid sintering, usually near the melting point of metal injection molding billet temperature sintering.Does not have a fixed the best sintering temperature is suitable for all materials, this is because the melting point vary with different materials, sintering temperature also vary with material.

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a common problem of degreasing

Skim the carbon content is a common problem in the control, skim the existence of residual carbon is likely to cemented carbide and silicon carbide, steel and other materials is good, but for other materials such as stainless steel, aluminum oxide is extremely harmful, magnetic materials, control of carbon is an important aspect in defatted practice, for some lack of stable carbide material system control carbon is a particular problem, carbon content is through the control of degreasing atmosphere and the choice of heating rate, if the temperature reached 450 degrees about polymer binder still not removal, so residual binder can cause carbon residue problems, to get a lower carbon content, note the following: the thermal degreasing late heating rate must be low, under the low temperature heat preservation, high gas dew point and the atmosphere of high flow rate.

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crack

Crack is easy to produce the green thickness changed a lot in area, thinner area binder removal could easily, because of the different concentration of binder, the variation in thickness of green area will be the result of the thermal expansion coefficient of different stress, the stress and the thermal expansion coefficient and temperature gradient, stress, low temperature heat preservation can eliminate this kind of heating too fast is one of the most common cause of crack.

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skim the generation of crack

Skim cracks may also be due to feed loading capacity is too low, as degreasing, binder is melting, the powder particles will redistribute, green will form in high density areas and low density area, crack will appear near the latter, low loading capacity can also lead to powder separation and flow, often characterized by uniform crack and contraction.

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the most common defects

Crack and deformation is one of the most common defects, degreasing degreasing rate must be controlled, and avoid the generation of defects, the imbalance of degreasing rate will lead to the green warp, this is because the green surface temperature is higher, binder was first removal, compact surface area due to the degreasing rate between different binder removal amount is different, can lead to different coefficient of thermal expansion buckling, likewise, skim disequilibrium caused by partial oxidation in the process of volume change will cause the sample warping, thermal degreasing appear crack and deformation in the process of showing the phenomenon of thermal gradient and deformation often concave to the heating area, heat speed when heated binder gasification formed on the surface of the internal pressure often leads to bubble, craze, this is due to internal pressure more than green strength, sometimes internal gas along the injection defects together, therefore, after the degreasing will see the obvious stratification.

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MIM deviation problem in technology

MIM technology has a shape change itself, but such change is predictable and usually is isotropic.And only commonly occur during sintering, so-called deformation is in the shape of irregular change, green of the binder concentration gradient in capillary force sufficient to cause warp, crack, and our goal is to minimize size deviation, and dimensional deviation depends on the size of the process in the process of control, this is one of the problems of MIM technology early, sintering conditions, conditions of geometric shapes and metal injection molding small changes will lead to big dimension deviation, sintering process due to the formation of sintering neck between powder particles, green strength.

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goal of degreasing

Skim goal is without defect and deformation of degreasing time as far as possible, and to ensure that the chemical composition of skim green control within the scope of the license, according to different adhesive in a variety of degreasing method, mainly divided into the thermal degreasing and solvent degreasing have catalytic skim.The thermal degreasing is divided into atmosphere thermal degreasing, vacuum thermal degreasing, siphon degreasing and oxidation degreasing;Solvent degreasing divided into intrusion degreasing and supercritical degreasing degreasing, condensing steam.

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solvent degreasing model

macro performance solvent degreasing process is a solvent by outgoing gradually dissolve in briquette binder and purpose of degreasing, soluble constituents in on microscopic unit can be divided into the following process: low molecular solvent diffusion in the green to contact with adhesive, solvent swelling and dissolving soluble substances in the binder, then binder was dissolved in part by diffusion to achieve compact surface, and finally into the solvent ontology, dissolve the binder and the binder, mutual diffusion of solvent may be degreasing process control procedures.

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skim temperature

Is important for solvent degreasing degreasing temperature, in order to not appear in the process of solvent degreasing defects, skim temperature must be controlled in appropriate range, if the temperature is too low, cracks will occur, because the solvent spreading paraffin wax, paraffin wax will slow solvent diffusion, causes the body to produce internal stress, on the contrary temperature is too high, green due to adhesive softening collapse, at the same time, due to the diffusion rate is accelerated, degreasing rate, height, body may produce even crack expansion.

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goal of degreasing

Skim goal is without defect and deformation of degreasing time as far as possible, and to ensure that the chemical composition of skim green control within the scope of the license, according to different adhesive in a variety of degreasing method, mainly divided into the thermal degreasing and solvent degreasing have catalytic skim.The thermal degreasing is divided into atmosphere thermal degreasing, vacuum thermal degreasing, siphon degreasing and oxidation degreasing;Solvent degreasing divided into intrusion degreasing and supercritical degreasing degreasing, condensing steam.

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