PRODUCT CENTER
specialize in producing metal injection molding parts, sintering parts and also other customized metal parts.
WHY CHOOSE US
a manufacturer of metal parts that focus on providing customers with high quality products and the best services.
ABOUT MDM Metal Industrial Co.,Ltd.
MDM Metal Industrial Co.,Ltd. is located in Shenzhen China, a manufacturer of metal parts that focus on providing customers with high quality products and the best services.
We specialize in producing metal injection molding parts, sintering parts and also other customized metal parts. Nowadays, people are looking for a good method for metal parts processing, for the purpose of shortening delivery time, improving products’ accuracy and most important saving cost.
Metal injection molding(MIM), a new method of metal processing: combining organic binder and metal powder, using the traditional method same as plastic injection to form the parts. This method enables the production of very complex shaped parts similar to plastic products or die cast products, but with savings in resources and energy, which is very suitable for production in big quantity.
MIM parts can be used in various kinds of industries, such as lock parts, OA parts, military spare parts, electronic spare parts, various kinds of precision metal parts etc. Besides, we could also provide with the service of surface treatment like black oxide, zinc plating, chrome plating, nickel plating and so on. The one_stop service will eliminate clients’ worries.
With more than 10 years experience of engineers, MDM is aiming to find the best solution for metal injection products. Our professional spirit and fast response will make you believe we are your best choice.
COOPERATIVE PARTNERS
CERTIFICATES
APPLICATION FIELDS
NEWS
Powder metallurgy is hopeful to make titanium parts turn into automobile manufacturing
New titanium powder forming technology on the basis of powder metallurgy compaction process, combined with the advantages of metal injection molding, by adding suitable amount of micro powder and improve lubricant or binder content, improve the liquidity, filling and forming ability of mixed powder, which can be used to make complex geometry parts (such as lateral concav e, threaded hole, etc.), has a very broad prospects for development.
Titanium powder forming technology is a kind of forming technology directly produce parts by the powder, produces almost final shape of parts is high yield and low cost method. This method basically does not require further processing or finishing, is good to control the size, and the stability of the parts is wonderful, the uniformity and mechanical performance can be fully guaranteed. Ti and Ti alloy parts produced by powder metallurgy have no composition segregation, with uniform organization and stable performance. Titanium car parts is a very attractive market, research and development production method of new materials with low cost, and combined advanced powder metallurgy near net shaping technology, is expected to make Ti turn into automobile manufacturing.
At present, the main impediment to Ti and Ti alloy widely application is its high cost, using powder metallurgy technology can effectively reduce the cost. To further reduce the production cost of Ti and Ti alloys, new Ti powder forming technology is constantly emerging.
Reduced iron powder has become irreplaceable high-grade materials in manufacturing industry
Reduced iron powder is the foundation of advanced powder metallurgy and soft magnetic induction device materials. The products because of the high machinability, can be made into all kinds of thin, special shape components, with a strong impact resistance, corrosion resistance, wear resistance and high strength characteristics, widely used in automobiles, machinery, ships, locomotives, etc. Is a high grade material cannot be replaced by the iron and steel made on pure melting.
In addition in the transformer core, electric induction device, high quality electrode, xerox, chemical industry, medical and food preservation is applied widely. With the development of science and technology, the application areas of high purity iron powder will be more and more widely, using amount is becoming bigger and bigger.
According to analysis, the initial raw material of reduced iron powder is iron oxide, mainly exists in the ferroferric(Fe3O4) oxide. Due to the original hydrogen reduction effect is not very good, so change to tunnel kiln using carbon as reductant to restore the product, the reduction efficiency is relatively high. So using carbon as the reducing agent in once reduction in deoxidization, the method is widely used.
Thus, powder metallurgy with reduced iron powder production process is also a kind of once reduction, so generally choose carbon namely coke as a reducing agent for reduction, at the end get the semi-finished product sponge iron. Form replacement sponge copper iron powder, of course, this is not the final product, but also on the broken again after processing to the secondary reduction, can use hydrogen as a reducing agent for reduction at this moment, to get the product we want.
The process of Metal Injection Molding
Metal injection molding(MIM) is a new type of powder metallurgy near netshaping technology that extended from the plastic injection molding industry. As we all know, plastic injection molding can produce various kinds of parts with very complex shape with pretty cheap prices, but plastic products’ strength is too low, to improve the strength we can add metal/ceramic powder in the plastic to get products with better strength and better wear resistance.
The processes for MIM are: first is to choose the metal powder and binder as required; Then use the appropriate method under a certain temperature to mix powder and binder into uniform feeding; Granulating and then injection molding; Decreasing the blank parts and sintering densification into finished products.
1.MIM powder and powdering technology
MIM has high requirements for raw material, so we should choose the raw material that good for mixing,injection,degreasing and sintering. While this is often contradictory. The research for MIM powder including: powder shape, particle size and particle size composition, surface, etc.
Because of MIM powder raw material requirement is very fine, the MIM powder raw material prices generally higher, some prices even up to 10 times of the traditional PM powder, this is one of the key factors limiting the widely use of MIM technology at present. The methods used to produce MIM powder including: carbonyl method, ultra-high pressure water atomization method, high pressure gas atomization method, etc.
2, Binder
Binder is the core of MIM technology, it has two most basic functions: enhancing liquidity to suitable for injection molding and maintaining compact shape. In addition it should be easy removal, no pollution, non-toxic, and reasonable cost etc. Therefore all kinds of binder appeared, in recent years it has been developing towards good direction.
Binder components is generally composed of low molecular macromolecule component, plus some necessary additives. Low molecular with low viscosity and good liquidity, is easy to remove; macromolecule component with high strength and will keep the intensity of black parts. The two mix in appropriate proportion collocation in order to obtain high powder loading capacity, finally get high uniformity and high accuracy products.
3.Mixing
Mixing is the process to get uniform feedstock by mixing metal powder and and binder. Due to the nature of the feedstock performance determines the final injection molding products, so the mixing the process step is very important. This involves the binder and the powder joining way and the sequence and the the mixing temperature, characteristics ofmixing device a variety of factors. The process currently stuck in fumble level based on the experience, an important index to evaluate the mixing process of is feedstock's uniformity and consistency. As to shear stress, it varies according to the difference of the mixing way.
The mixing of feedstock is under the combined effect of thermal effect and shear force. Mixing temperature can not too high, otherwise the binder may decompose or two phase separation phenomenon will happenbetween powder and binder due to the low viscosity. Common used mixing device: twin-screw extruder, Z impeller mixer, single screw extruder, plunger extruder, dual planetary mixer, double CAM mixer and so on, all these mixing device is suitable for the preparation of viscosity in the 1-1000 pa s.
Mixing method is usually first join high-melting component, and then cooling, join the low melting component, and then in batches to join metal powder.This can prevent the gasification and decomposition of low melting point component, partial add metal powder can prevent the cooling fast shock caused by the torque, reduce equipment loss.
4.Sintering
Sintering is the last step in the MIM process, sintering removes pore between powder particles, make MIM products to achieve full density or close to full densification. Metal injection molding uses a large amount of binder, so the shrinkage is very large when sintering, commonly the shrinkage rate is between 13%~25%, so there is a deformation control and the dimensional accuracy control problem. For MIM products, most parts are with irregular and complex shape, so the deformation problem is more outstanding. Uniform feedstock is a key factor for the final sintered product size precision and deformation control. For iron and stainless steel products, there is a carbon potential control problem. Because the price of fine powder is higher, researching the strengthen sintering technology of coarse powder compact is an important way to reduce the production cost of powder injection molding, The technology is currently an important aspect in the research of metal powder injection molding.
MIM products due to the complex shape, big sintering shrinkage, most products need to do post-processing after sintering. Including reshaping, heat treatment(carburizing, nitriding, carbon nitrogen altogether permeability, etc.), surface treatment(fine grinding, ion nitriding, electroplating, shot peening hardening, etc.), etc.
4.Injection molding
The purpose of the injection molding is to obtain the required shape with zero defect, particle uniformly arranged of MIM black part. First heat the granular feedstock to a certain temperature to make it liquidity,then inject it into mold cavity and cooling down to get the required shape with certain rigid body, finally eject the rigid body from the mold and that is the black part. This process is consistent with traditional plastic injection forming process, but as a result of the MIM feedstock high powder content, make the injection process have big difference in parameters and other aspects, improper control will lead to all kinds of defects easily.
5.Degreasing
Since the MIM technology was generated, with the different binder system, a variety of MIM technology pathes were formed, also for degreasing methods. Degreasing time reduced by the first few days to a few hours now. All the degreasing methods can be roughly divided into two categories: one is the two-step degreasing method.Two-step degreasing method including solvent degreasing + thermal degreasing, siphon degreasing+thermal degreasing, etc.