Metal Injection Shock Absorber Parts

Metal injection molding(http://www.zcmim.com/) is used in industrials and electronics. It is also being applied to automatic absorber parts, motorcycle shock absorber, piston rod and piston guide valve such kind important components. Considering the stable damping force of shock absorber, powder metallurgy part has high precision sheet surface, can reduce friction and guarantee the stability of operation, improving comfort as well.

Original article link：http://www.zcmim.com/article/metal-injection-molding-msap_1.html

High density of powder metallurgy parts

At present, China in terms of the consumption of iron powder and copper powder has surpassed Japan, the first in Asia.The main application field for the future of powder metallurgy parts(http://www.zcmim.com/) or in the field of automobile, from a technical perspective, the high density of powder metallurgy parts, a new powder metallurgy materials, high efficiency and high precision of powder metallurgy equipment is the trend of the future development of powder metallurgy industry.The future development of powder injection molding are mainly in the material and design efforts, the use of the advantages of this technology, and to help customers improve product design and reduce the cost, so as to expand the application field of powder injection molding.

Original article link：http://www.zcmim.com/article/powder-metallurgy-parts-hdopm_1.html

Powder Metallurgy Technology - Manufacturing of Mechanical Parts

Secondly, another major development direction of powder metallurgy technology is the manufacture of mechanical parts, including structural parts, oil bearing and sintered friction materials, etc.. Powder metallurgy parts started in 1916, used in copper based powder metallurgy oil bearing industry. With the development of automobile industry, powder metallurgy parts begin to be used in automobile manufacturing industry.

Original article link：http://www.zcmim.com/article/powder-metallurgy-parts-mom_1.html

Powder Metallurgy Parts—Performance

In pressing process, due to friction between mould and powder, powder and powder, make the pressure distribution not uniform, also led to un-uniform microstructure of blank, Powder metallurgy parts(http://www.zcmim.com/bymaterial.shtml) it will result in un-uniform shrinkage during sintering process. Therefore we had to reduce sintering temperature to reduce this effect, which make large porosity and less density, seriously affecting product Original article link： http://www.zcmim.com/article/powder-metallurgy-parts_1.html

Where is the difficulty of powder metallurgy technology?

Powder metallurgy is now common in all kinds of industries, machinery, industry and some new development energy will also be used in powder metallurgy parts, powder metallurgy technology, forming, sintering is the basic process of powder metallurgy. Today, what is the difficulty of powder metallurgy technology?

1, the traditional powder metallurgy iron parts - gear as an example

A lot of time on the mechanical properties of the requirements is not high, on the size of the accuracy requirement is high, the general density in 6.9~7.1 is can the, the forming process requirements is not high, the sintering process requirement is high, and prevent the sintering deformation, can add Cu anti sintering shrinkage.

With the development of technology, the high-performance powder metallurgy iron-based parts demand more and more high, which must to improve the density of powder compacts, which the forming technology put forward higher requirements, the development of warm compaction, high velocity compaction technology, the density of the component can achieve 7.2-7.4.

To further improve the mechanical properties of powder metallurgy parts, also need to improve the compact density, which must be from the powder is prepared to consider, and milling technology of powder pre processing technology has become the focus, and now the quality of water atomized iron powder, the plasticized powder processing, compact density can be up to more than 7.5, which is the highest level of modern powder metallurgy parts and ten years ago is unthinkable.

2, other powder metallurgy material difficulties

Other powder metallurgy materials are the same, it can be said that the powder, forming, sintering an. Of course milling method in a hundred, forming method speak ten, sintering method are also many, the ultimate principle is to take the most economical method to meet the requirements of the premise.

Powder metallurgy technology has a significant energy saving, material saving, excellent performance, high precision and good stability, and a series of advantages, is very suitable for mass production.

Powder metallurgy parts how rust?

Powder metallurgy parts in the process of production and processing of the need for the rust of the dense material surface rust treatment, dense material anti rust liquid MJ316, rust treatment, does not affect the post order processing.

Ingredients: film forming material, antioxidant, etc.

Performance characteristics: water-based, coated with good resistance to high temperature, for different parts, there is a certain ability to resist strain;

Black and non-ferrous metal surface rust, oxidation.

Scope of application: cast iron, iron base powder metallurgy products, powder sintering dense materials, machining parts and other surface rust treatment.

Environmental safety: the solution for the environmental protection water soluble rust solution; do not produce volatile toxic substances; accidentally contact with the body,

Please wash with plenty of water first.

Use before mixing or shaking even after the solution, immersion or spraying on the surface of the metal drying (drying) can be,

Anti rust period of up to 18 months - 30 months.

Can be diluted with water. This product should not be mixed with other anti rust products.

Packaging and storage: 10/25KG barrels; store in a cool place, sealed.

Validity: 6 years and 1 months.

Performance parameter:

Appearance: dark liquid;

Thermal stability: < 180;

PH value: 8-10;

Viscosity: 12cps;

Specific gravity: 1.05;

Flash point: more than 90 DEG c;

Steam treatment process in powder metallurgy process

In the powder metallurgy process, for it is refrigeration compressor steam treatment on the sealing process and increase the tightest, namely the powder metallurgy parts placed in a heating furnace at a certain temperature, certain amount to pass into the furnace in the supersaturated water vapor, in part around the existence of a large number of water vapor.

Those who come into contact with the surface of the steam iron atoms, including the outer surface and the inner surface of the connected voids occurs, oxidation reaction, generating a layer of oxide film, the main component of this layer of oxide film is Fe3O4, Fe3O4 is a body centered cubic system, the density of 5.16g/ cm3, the Fe3O4 of iron than the volume ratio, the internal parts of the connectivity gap closed, achieve the purpose of sealing parts, increase air tightness.

Due to the oxide film and cover in the parts of the substrate surface, very dense and strong adhesion, resulting in the environment of water vapor and corrosive medium is difficult to enter the parts inside, to reach a good anti rust function. Due to the high hardness of Fe3O4 and Rockwell hardness of pure Fe3O4 around 50HRC, processing parts of the apparent hardness reaches more than 60HRB, is helpful to improve the base parts surface hardness, wear resistance, anti abrasion, tensile strength can also be improved, steam treatment, the tensile strength of iron base materials increased 40-50%.

Difficulties in processing powder metallurgy parts

Although the development of P / M industry one of the goals is relieving machine and process of P to a main attraction is only a small amount of processing is needed, but many parts still need processing accuracy and better surface finish. Unfortunately the processing of these parts is extremely difficult. Most of the trouble encountered is caused by the porous.

Porous lead to micro fatigue of blade. Cut out the cutting edge of the cut, it is passed between particles and holes. The impact caused by the repeated small cracks on the cutting edge of the. The fatigue crack growth until the cutting edge chipping. This is usually very small micro chipping, abrasive wear is usually normal.

Also reduce the thermal conductivity of P/M porous parts. The result is on the cutting edge of a high temperature and can cause crater wear and deformation. Path connected to the internal porous structure provides cutting fluid discharged from the cutting area. This will cause thermal cracks or deformation, especially important in drilling.

The surface area of the porous structure caused by inner increase also allows oxidation and / or carbonation occurred during heat treatment. As previously mentioned, the oxide and carbide hard wear.

This is extremely important porous structure is also given failure parts hardness readings. When one intends to measure the macro hardness of P/M parts, which includes hole hardness factor. The porous structure leads to the collapse of the structure, the relatively soft parts of the wrong impression. A lot of hard particles to the individual. As described above, the difference is dramatic.

In the powder metallurgy parts of inclusions is negative. In the process, the particles are pulled from the surface when it is rubbed out of the cutting tool and can form a scratch or scratch on the surface of the part. These inclusions are usually large, leaving visible holes on the surface of the part.

The carbon content of the mixed lead to inconsistent workability. For example, the carbon content of FC0208 alloy is between 0.6% and 0.9%. A batch of 0.9% of the material with carbon content is relatively hard, resulting in poor tool life, while the other batch of carbon content of 0.6% of the material has excellent tool life.Two kinds of alloys are within the allowable range.

The final machining problem is related to the type of cutting which occurs on the P/M part. As the parts are close to the final shape, the cutting depth is very shallow. This requires free cutting edge. The built-up edge of the cutting edge often leads to micro collapse.

How to improve the processing performance of metallurgical parts?

(http://www.zcmim.com/)Powder metallurgy can was prepared by ordinary smelting method to preparation of special materials, and can produce various kinds of precision mechanical parts, powder metallurgy forming features not only, also labor-saving.

Physical properties of powder metallurgy, such as particle shape, particle size, particle size distribution and specific surface area. Common spherical, granular, flake like and needle like. The linear size of a single powder particle is its size, according to different size, divided into several levels, each level of powder in accordance with the quality, quantity or volume percentage is its size distribution.

The total surface area per unit mass of powder is its specific surface area. When the powder is compressed into a certain shape and the ability to maintain this shape in subsequent processing, the higher the compressive strength obtained under a certain pressure, the better the formability of powder metallurgy.

Other applications of powder metallurgy materials

First, to provide special materials for manufacturing and defense industries. Manufacturing industry is the foundation of the sustainable development of the national economy. It is the engine and power source of industrialization and modernization. Powder metallurgy products in the manufacturing industry especially the equipment manufacturing industry in the use of high strength, high density of mechanical parts, hard alloy, electric contact materials, a variety of permanent magnetic and soft magnetic materials, sintered metal filter material, etc. more and more.

In the defense industry, such as launch vehicles, missiles, aircraft engines, ships, nuclear industry, the use of heat and corrosion resistance, refractory metals, ultra hard materials in the military electronics industry, etc.. Can only be produced by powder metallurgy technology. In the modern science and technology, nanotechnology is an emerging field of powder metallurgy. Therefore, in the world, powder metallurgy technology has been a new technology is paid more attention in the field of material science.

Second, another powder metallurgy technology is the main direction of development of manufacturing machinery parts. Including structural parts, oil bearing and sintered friction materials. Powder metallurgy parts starting in 1916, in the performance of copper based powder metallurgy bearing industry. With the development of automobile industry, powder metallurgy parts for automobile manufacturing industry.

In order to adapt to the car to environmental protection, energy conservation, reduce manufacturing cost and improve the performance requirements, people developed the automobile engine, gearbox and other used on thousands of key powder metallurgy parts, such as exhaust door seat, a connecting rod, a ABS ring, all kinds of gear, chain wheel, automatic variable speed device part, cam. Powder metallurgy technology has become the automobile and auto parts manufacturing industry to improve and enhance the quality and development of new materials, new products, reduce production cost and enhance the competitive ability is one of the key technology. The global auto industry has been paid much attention.

Processing method for complex parts

The structure of the more complex parts are generally precision casting or investment casting process. Here zcmim powder metallurgy to introduce the processing methods of complex parts there.

Part structure analysis

The analysis of the components in the processing of parts by important, it analysis the influence to the parts clamping. Don't underestimate this link clamping. Often put clip mistakes can make the machining process can not continue down, so that the parts can not be completed.

1, the basic types of parts

(1) parts of the composition of a variety, such as the pros and cons of mating parts, parts of the surface of the main surface of the parts to be processed parts. First, we should according to the characteristics of the parts to analyze the processing route of the parts.

2, parts of the processing surface

(2) the selection of parts of the processing surface is very important, often the wrong choice of the processing surface so that parts can not be installed in the next step, so that parts processing can not continue.

Two, a brief introduction of the processing parts of the relevant processes

1, part of the processing of material selection

Blank data including all blank manufacturing methods of technical and economic characteristics of various profiles of varieties and specifications, rough map; under no blank map, practical understanding of the blank shape, size and mechanical properties of the. Different material will affect the components and different material will make the service life of the parts and the production cost is greatly different, so parts of the material is especially important.

2, to develop the process route.

3, determine the machining allowance of each process, calculate the working dimensions and tolerances.

4, determine the various processes used in the equipment and tools, fixtures, measuring tools and auxiliary tools.

5, determine the time quota.

6, processing parts.

7, check the size of the parts.a

Demand for powder metallurgy parts remains stable growth

In the past 10 years, from the market demand for auto parts, from 34% to 45% growth. And, in recent years, the demand for powder metallurgy parts in the automotive industry is still growing steadily. A car in the weight of powder metallurgy parts, the United States increased from 12 kg to 18-20 kg, Japan rose from 6.5 kg to 10 kg, from 7 kg to 8-10 kg in europe.

Large orders, high profits, become the supplier of auto parts, is the development goals of many powder metallurgy enterprises. However, the strict requirements on the quality of automotive parts, discourage  many enterprises.

As with the host plant plans to maintain coordination, to meet the needs of the host plant frequent changes: "on time delivery" supply mode; to ensure quality and stability, the whole process of quality tracking, etc.. Faced with changes in market demand, how to overcome the difficulties, seize the opportunity, every day thinking about the problem of powder metallurgy entrepreneurs. "The devil in the details", from the powder metallurgical material and mixed material screening, forming, sintering and post processing, On a step by step, resulting in thousands of miles.

The 21st century, the rapid development of science and technology for powder metallurgy products of China's rapid development provides a solid foundation, powder metallurgy products in China from so far only lasts for a few decades of time has in the market into the from all walks of life, which indicates that the powder metallurgy products in today's society has great significance.

Solution to the cracking of powder metallurgy products

(1) materials integrated error

For a variety of reasons, metal powder additives are used. For example, adding a suitable lubricant mixed will enhance the compressibility, reduce demolding force. However, mixed powder added lubricant can inhibit the formation of bonding between particles, adhesives, impurity and residual air will be the bond formation have a negative effect.

(2) particle displacement

Bonding between particles initially mainly by the plastic deformation and the powder block movement formation, under ideal conditions, the densification process is a two-way, symmetrical and synchronous and will not happen between particles shifted side. Densification process after the shift will prevent the formation of bonding between particles, and can has been broken in forming the early formation of the bond.

(3) non normal plastic strain separation process

Particles will not recoverable plastic deformation. In addition to the recovery of plastic deformation will occur. The final forming stage, the pressure will reduce and eventually in the demoulding process is reduced to zero. Forming pressure vent out moment, compressive stress release, forming body embryo will suddenly from the plastic changes in the aptitude elastic stage. If the internal stress is less than the limit of the strength of the body, the crack will be generated.

(4) high tension and shearing force

Under the condition of powder metallurgy, if the forming body is formed by external or internal forces, the shear force is higher than the strength of the raw embryo, then it will crack.

(5) the cause of crack caused by material integration

Air left in the forming process of powder material, powder weight is approximately in accordance with a 2:1 ratio decreased. Inter granular pores filled with air must be in the forming process of extrusion, and must be completed in less time, the air must be from the powder matrix and design with the gap tolerance of very small mold assembly is extruded.

Powder metallurgy parts crack mainly occurred before the sintering process of pressing forming and processing process. Although crack may be in sintering becomes apparent, but the root cause of the cracks may is prior to sintering bonding between particles are relatively poor. Sintering caused by stress may crack "open", but this is likely to have been produced prior to sintering processing step. Few examples of incorrect product design may lead to sintering at higher stress level. Therefore, we should stress level may exceed the strength of the parts of the leading to mechanical failure.

Application of laser welding in powder metallurgy parts.

Due to the powder metallurgical raw materials of special properties and manufacturing process. In some areas are widely used and gradually replaced the traditional metallurgical materials, and now we consider the most is connection between the powder metallurgy parts and other parts. In the 1980s before we apply the most extensive is brazing and projection welding, but the combination of degree is not high, adapt to the high temperature high strength of occasions, so powder metallurgy parts due to the problem of welding eat cold shoulder in many industries.

With the development of technology, in the beginning of the end of 80 in the field of powder metallurgy parts welding have new laser welding join, many advantages of suddenly, also acts as a foil to the US powder metallurgy advantages. Laser welding and traditional welding methods are: depth to width ratio and narrow weld and weld with high strength, small heat affected zone, welding deformation small, effective improve the productivity also realize the welding process automation, and many other advantages.

Now technology is so advanced, each industry has a breakthrough in the field, laser welding and cutting effectively solves the problems we powder metallurgy parts and other parts are connected, I believe that in the near future, we powder metallurgy parts welding project will enter a new breakthrough in the field.

Use in the car for more than thousands of powder metallurgy parts

Powder metallurgy is an important part of forming technology. The new technology for powder metallurgy constantly, will promote the rapid development of the high-tech industry, but also will bring the prospect of material engineering and manufacturing technology of light.

由于粉末冶金工艺具有节约原材料、自身重量轻、性能优异、成本低等众多优势，除发动机、变速器和电动机轴承外，现在粉末冶金零件在汽车上使用的范围也越来越广，更多的零件被用在底盘、车身、内饰等处，前景十分广阔。目前，在汽车上使用的粉末冶金件已经超过了1000种。有业内人士指出，粉末冶金结构零件在替代已有的齿轮、凸轮、链轮、各种形状的铸件、锻件、切削加工件和开发新型结构零件方面具有独特的优势。

Due to the powder metallurgy process with raw material is saved, and the weight of its own light, excellent performance, low cost, which has many advantages, in addition to the engine, gearbox and motor bearing, now use powder metallurgy parts in automobile is more and more widely, more parts are used in the chassis, body, interior department, the prospects are very broad. 

At present, powder metallurgy parts used in the car has more than 1000. Insiders pointed out, has unique advantages in powder metallurgy structural parts to replace the existing gear, cam, sprocket, various shapes of castings, forgings, cutting and the development of new structural parts.

为了实现人类与自然和谐共存目标，必须改变现有的生活方式，节约能源，减少CO2的排放，保护生态，迎接低碳时代的到来，新能源汽车的正逐渐使用。大力发展粉末冶金新技术的研究，对迎接低碳时代的到来，新能源的逐渐使用具有非常重要的意义，粉末冶金零部件也朝着节能减排目标发展。

In order to realize the harmonious coexistence of human and nature of the goal, we must change the existing way of life, save energy, reduce CO2 emissions, protect the ecological, to meet the arrival of the era of low carbon, new energy vehicles is gradually. Study on the development of new technology in powder metallurgy, to meet the low-carbon era, new energy use gradually has a very important significance for the powder metallurgy parts also toward the goal of development of energy saving and emission reduction.

On the advantages of powder injection molding of cemented carbide

cemented carbide powder injection molding technology advantage

Injection molding technology for the production of powder metallurgy parts of the raw materials required to be harsh, in the range of 0.1-10 m particle size of the powder produced products are easy to achieve high dimensional accuracy. The current hard alloy used raw material production basically belong to the size range, meet the requirements of raw material powder MIM technology, so hard alloy powder can be directly applied to injection molding process, raw material cost is not increased, it is hard alloy injection forming technology is a big advantage.

Hard alloy with high hardness, high strength, wear resistance, corrosion resistance, high temperature resistance and expansion coefficient is small wait for a series of advantages, is indispensable for metal processing, mining, oil drilling, national defense and military tools and materials. In addition, in recent years hard alloy in a watch case, the decoration wear-resistant parts has also been widely used.

The traditional hard alloy production method (pressing and sintering method) can only produce relatively simple products, thus limiting the scope of application of cemented carbide. Cold, hot and other static pressure can produce complex shape products, but the cost is very high, not suitable for mass production. Hard alloy injection forming technology and widen the application fields of the hard alloy, the technology can to lower the cost of producing a near net shape, complex geometry and ordinary molding and other methods are difficult to manufacture the product.

At home and abroad, there are differences in the main application areas of powder metallurgy products

At present, powder metallurgy parts technology has been widely used in the fields of automobile, household appliances, construction machinery, electric tools, etc. However, there are differences between domestic and foreign powder metallurgy products in the main application areas.

From the developed countries or regions of the powder metallurgy product structure, the automobile industry is the largest industry in the powder metallurgy parts industry. Developed countries and regions of the powder metallurgy parts of about 90% are used in the automotive industry. Because the development of China's auto industry is relatively late, and the industry of home appliances and motorcycles developed earlier in China, the product structure of the powder metallurgy industry in China is different from that in the developed countries. Automotive industry is China's largest powder metallurgy parts market, which accounted for of the powder metallurgy parts market increased from 32% in 2014 to 57.8% in 2005, is still far below the level of the developed countries.

The development of China's automobile industry not only provides a huge market demand for the powder metallurgy industry, but also puts forward higher requirements for the technology and quality of the powder metallurgy industry in China. Powder metallurgy auto parts can promote the automobile lightweight, energy-saving emission reduction, with the promotion of the domestic automobile market of sustainable development and energy saving and environmental protection policy, powder metallurgy auto parts market will also enter the new period of rapid development, powder metallurgy auto parts will become the main direction of development of the powder metallurgy industry.

Present situation and market demand of powder metallurgy technology at home and abroad

According to the China General Machinery Parts Association powder metallurgy branch report, 2006 China's powder metallurgy parts and products production increased by 17.5%, reaching about 88000t. Statistical product categories include iron copper based powder metallurgy parts, oil bearing and friction materials. In which the amount of powder metallurgy parts of the automobile market is about 32000t, accounting for 37%, an increase of 28%; power tool market growth of 29%.

The future will show a potential of China's automobile parts in powder metallurgy products market growth spurt. According to statistics, the amount of powder metallurgical products in developed countries accounted for the vast majority of the total production of powder metallurgy products, such as the United States accounted for 90%, 80% in Europe, while China is still less than 40%. European average per vehicle powder metallurgy products usage is 14kg, Japan is 16KG, the United States has reached more than 19.5kg.

The next few years is expected to reach 22kg, while China's current average per vehicle powder metallurgy products are only about 5kg. If calculated according to an annual output of 50 million cars, China's annual auto parts uses about 2.5 million tons of iron and steel powder, if the amount of our country every car powder metallurgy products to reach the European level, and keep car powder metallurgy parts replacement, so only the steel powder will need to nearly 10 million tons, is 1.25 times as much as that of the powder metallurgy total demand.

Design points of stainless steel powder metallurgy structural parts

1, material selection

The choice of material of stainless steel powder metallurgy parts, in addition to the mechanical properties, should also to select the raw powder of the species and its composition, the density of the material, sintering conditions and subsequent processing in accordance with the requirements of part of wear-resistant, corrosion resistance and other characteristics.

Although, in high alloy powders as raw materials by material of high density and sintering conditions, or the carburizing and quenching heat treatment, the physical and mechanical properties of stainless steel powder metallurgy parts material increased, but parts of the production cost also correspondingly increased. Therefore, in the selection of materials, it is best not to pursue the excessive material properties, and increased production costs.

2, shape design

Stainless steel powder metallurgy structural parts are generally made of metal powder with single axial compression, so the shape of the parts are subject to various restrictions. When designing parts, we must pay attention to overcome these limitations, so as not to increase the production cost of parts or produce quality problems. In addition, the clever use of combination or sintering method, such as the legitimate, but also to overcome some of the limitations of the shape of the parts.

In addition, some parts of the shape of cutting and other methods can not or difficult to make, but it is suitable for stainless steel powder metallurgy process. Such examples are many, such as tooth in motor pulley, the transmission synchronizer gear hub etc.. This kind of parts fully embodies the characteristics of stainless steel powder metallurgy technology.

3, size accuracy

Generally speaking, although can be made very high dimensional accuracy of green compacts, but due to shrinkage or swell produced in the sintering process, powder metallurgy parts size precision reduced. When the size precision of stainless steel powder metallurgy parts can not meet the technical requirements, it is necessary to increase the finishing, cutting, grinding and other follow-up processing. Therefore, to determine the size accuracy of parts, to master the allowable size of each process accuracy, as far as possible to reduce the number of processing procedures, in order to reduce the production cost of parts.

The microstructure of products is uniform, high density and good performance.

In the pressing process due to the friction between the wall of the mould and the powder and powder and powder, the pressure distribution is very uneven, resulting in the pressed blank in the microstructure is not uniform. This will cause pressed powder metallurgy parts in sintering shrinkage is not uniform, so we had to reduce sintering temperature to reduce this effect, so that products of porosity, material density, low density, seriously affecting the product mechanical properties.

Whereas the injection molding process is a kind of fluid molding process, adhesive guarantee the powder evenly distributed which eliminates the uneven microstructure of blank, and sintering the density of the products can reach to the theoretical density of the material. In general, the density of the product can be compressed to a maximum of 85% of theoretical density. The high density of the product can increase the strength and toughness, and the ductility, the conductive heat conductivity and the magnetic properties can be improved.

High efficiency, easy to achieve large quantities and large-scale production of MIM technology using the metal mold, and its life and engineering plastic injection molding tool quite. Due to the use of metal molds, MIM is suitable for the mass production of parts. Due to the use of injection molding machine is blank, greatly improves the production efficiency, reduces the production cost, and the injection molding product consistency and repeatability, to provide a guarantee for large batch and large-scale industrial production.

Application materials a wide range, the broad field of application (iron, low alloy, high speed steel, stainless steel, G valve alloy, hard alloy) can be for injection molding material is very extensive, in principle any, including traditional manufacturing process of difficult to machine materials and high melting point materials, pouring hot junction of powder materials can be by MIM process caused by parts. In addition, MIM metal injection molding can also be based on the requirements of the user material formulation research, manufacture any combination of alloy materials, the composite material into parts. The application field of injection molding products has been widely used in various fields of national economy, and has a broad market prospect.