The effect of steam treatment on powder metallurgy products

After simple processing of powder metallurgy products using the steam, you can get ideal anticorrosive property, because the iron atoms on the surface of the oxidation reaction with steam, to produce a layer of oxide film, anti rust performance of the products is therefore improved a lot. And because of the hardness of the film is very high, so once after the adhesion on the surface of a product, its abrasion resistance and wear resistance will change.

Powder metallurgy products have an important role in the steam treatment, that is, sealing holes. In addition, the effect of the powder metallurgical products after steam treatment on the dimensional accuracy is not very large. The whole process will not pollute the environment, and the energy consumption is not high.

High precision and high technology to further enhance the bearing demand

Although in recent years, China's bearing development and progress, but compared with the world's bearing industrial power, there is a certain gap between China's bearing. The main performance is high technology, high precision, high added value of the product ratio is low, the stability of the product needs to be further improved and improved. Affected by the impact of last year's global economic situation, China bearing manufacturing industry have a certain impact, bearing orders greatly reduced, year ago few orders reduces the general around, so that the original market overcapacity in the formation of more intense competition, a threat to most of the enterprises.

With increasing the degree of policy support, I believe China's bearing industry development will usher in the spring, will accelerate the process of domestic high-end bearings, provide a solid foundation for China's heavy equipment manufacturing made entirely of.

China is actively promoting the development of high-end equipment manufacturing industry, with high technology and high precision end bearing demand will further increase, which requires domestic production enterprises and constantly improve the level of technology, speed up industrial restructuring and upgrading, and high-end imported bearings to narrow the gap between the quality, realize the market of high-end bearings in China.

The stability of the metal powder properties, especially the stability of the powder property directly affects the quality of the powder metallurgy products. The reason, in addition to the daily production process strictly control the chemical composition, particle size and particle size composition of the reduction iron powder, the main should be in the reduction of iron powder in the factory before the powder mixing process in-depth study.

It is reported that China's reduction of iron powder production continued to grow, varieties in the expansion, the quality is improving, the market is well developed. But. As the reduction of iron powder manufacturing raw materials prices, metal powder manufacturing industry operating pressure. Metal powder metallurgy manufacturers should increase the intensity of technical reform, optimize the production process, reduce production costs. Expand the application of reduced iron powder, so that China's metal powder manufacturing industry to maintain stable and rapid development.

Powder metallurgy is very active in the market.

Yesterday our boss has been said to me, how recently there are always people to join we this group, I took a look at what we always call is: ZCMIM discussion groups, this is that a problem the, first to understand a lot of MIM industry, of course, does not rule out some other industries or topics. To tell the truth now MIM powder metallurgy market than before to expand a lot, but also on behalf of the future development of the market will be better!

Powder metallurgy has been able to develop rapidly in today's market, because it has a lot of advantages. Powder metallurgy products appear as the development of modern society has brought very big role in promoting in various industrial fields, powder metallurgy products play the strength of its own, such as in the rapid development of automotive production, powder metallurgy process for its provides all kinds of advanced accessories products, improve the performance of the car. In fact, powder metallurgy products in the market has very large development potential, because it can accurately grasp the user's needs, to meet the use of all aspects of the user so that it can occupy a very important position in the market.

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.

Why powder metallurgy products will crack?

Why powder metallurgy products will crack? The potential crack has been regarded as having a huge impact, and often become the production of complex shaped parts, for the industry participants, enhance the obtained material performance benefits only than the weight of solving the problem of crack is slightly higher.

Detailed powder metallurgy products cracking causes and solutions:

1, the formation of cracks

Usually, a solid force separation or split into 2 or more parts, which is called fracture. Fracture can be the cause of crack, crack growth and loads.

For powder metallurgy forming body embryo, cracks can be classified as one of the following reasons:

Inter particle rupture interlock;

No particles are mutually locked.

The main reason of interlocking rupture between particles are powder blocking or stretching.

Interlock rupture may be a combination of action under tension applied or transverse shear stress or two force.

The rupture area may be deeper than the shallow surface, and may be irregular and discontinuous.

On the other hand, if by reach micro should stress intensity level of force or stress caused by stress concentration will result in the formation of the cracks. Therefore, when the transverse or horizontal powder particles crack surface of the regular force component to stress cracking, cracks appear from the outside should force or internal stress generated.

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.

What are the key points to be mastered in the forming process of powder metallurgy products?

Powder metallurgy products, powder metallurgy, metal injection molding

Powder metallurgy products need to be used to the mold, then the products in the process of forming what should be the main point of it?

Metal injection molding powder metallurgy common forming method is in rigid closed mold metal powder compression molding, the mold cost is high; due to poor powder mobility, and by friction, compact density is generally low and uneven distribution, high strength, thin wall, elongated and along the pressing direction was changed for the section of the product is difficult to form. Therefore, the design of the structure of the parts used for pressing and forming should pay attention to the following problems.

1) free from the side walls of the groove and the concave hole, in order to facilitate the compaction or reduction of residual block.

2) avoid along the pressing direction for increasing the cross-sectional area, compaction. The junction of the wall should be rounded or chamfered transition, avoid sharp corners to compaction and prevent the stress concentration caused by mold or compacts.

3) the amount of simple, symmetrical shape, avoid cross section change is too large and narrow groove, spherical and so on, in order to facilitate the mold making and compaction,

4) free local thin for powder compaction and prevent the emergence of crack.

High performance metal powder market share is increasing

China is a big country in the world, the rapid development of the national economy is a great demand for high and new materials, especially the rapid development of automotive and electronic industries, the demand for high-end powder metallurgy products is strong.

In addition, countries in the world are constantly strengthening the research and development and application of 3D printing technology, the United States and some European Union countries have led the world 3D printing technology, and in the application and promotion of the technology to get the initiative. Powder metallurgy forming technology to make the powder "grow into" parts, for the development of 3D printing technology provides a convenient, boost metal powder metallurgy into a power of the industry.

In recent years, enterprise of our country iron through in the production of grasp quality, grasping the marketable products, generally improve the quality of iron powder, also opened the hedonic price gap. At present, the status quo of the domestic iron powder market is high quality iron powder and special use of iron powder in short supply, the production of surplus products, high-end powder metallurgy products still need to be imported from abroad.

Proven metal powder metallurgy auto parts in the proportion of light to do

Powder metallurgy products are used forming and sintering of metal powder ( or mixture of metal powder and nonmetal powder ) is made of materials and products technology. It is a branch of metallurgy and materials science . Applications of powder metallurgy products is very wide , from general machinery manufacturing to precision instruments ; from hardware tools to large machinery; from electronics to the motor manufacturing industry ; from the military industry to civilian industry ; from the general to sophisticated high-tech technology , can see powder metallurgy figure

In corrosion resistance and high temperature performance, compared with ordinary steel stainless steel can be thinner and more compact, so as to achieve the purpose of weight reduction. Compared with castings and forgings powder metallurgy, powder metallurgy auto parts lighter specific gravity (due to pore more), plus its high precision, low cost reasons, it is used in the auto parts more widely. Lightweight cast iron castings mainly in its gravity is less than castings and forgings. In addition, the production process than cast iron cast steel excellent abrasion resistance, cut resistance, thermal resistance and vibration absorption, also superior to steel, cast iron instead of steel, forgings trend in the car manufacturing increasingly large , instead of ductile iron crankshaft forgings is the most successful example.

Auto parts supply work, the relationship between the production and operation of enterprises huge supply shortage will affect production, excess inventory, backlog of capital. For these situations, we focus on practical work in the market mechanism, to explore a reasonable balance between supply and demand of auto parts, suitable for the market economy and the establishment of the characteristics of supply and demand mechanism itself, make a good supply of auto parts production and management services for businesses. Possession of the national economy can not be underestimated, the relevant departments should closely cooperate fully imported cars function.

Powder metallurgy technical safety requirements in the production of very important

In the production of powder metallurgy technology requires not only technical skills, more importantly, the production of security . Safety plays a very large role in the production of powder metallurgy technology , which the staff of the production of powder metallurgy products, knowledge and training in security measures . In order to ensure safety in production technology of powder metallurgy products , we must implement the following basic measures .

( 1 ) Production of powder metallurgy products, workplace arrangement according to the requirements of modern hygiene , styling equipment should be in accordance with the process design configuration , leaving the channel for use by people and vehicles , shall be equipped with a table and opening the fence . Process equipment and lifting and transport equipment active area where the danger should be installed on the column cover .

( 2) The exhaust gas is more dust and powder metallurgy equipment and the workplace must be dust cover and install ventilation systems , into the atmosphere of the gas to be purified.

( 4 ) vibration isolation device must be installed on the ground , cover shaker, mixer and other equipment must cover from the sound-absorbing material , and these devices installed in the seclusion room .

( 5 ) plating section must be filled with a special solution bucket to fall in the electrolyte when the workers' skin , timely and electrolytes. In addition , it should be taken into account from the chromium electrolyte can groove , trough containing cyanide electrolyte and acid-base extraction tank vapors were in and out .

(6 ) being processed powder metallurgy products should rationing hat , overalls or common seal overalls , gloves and masks .

( 7 ) is subjected to radiant heat and convection heat effect of powder metallurgy products, it shall be equipped with goggles, work shoes , hats , overalls and gloves sealed .

Through familiar with safe production of powder metallurgy products , in accordance with the normal measures of production , powder metallurgy products, production will be very safe and effective, but also easy to powder metallurgy products , like other products, production safety

Powder metallurgy technical safety requirements in the production of very important

In the production of powder metallurgy technology requires not only technical skills, more importantly, the production of security . Safety plays a very large role in the production of powder metallurgy technology , which the staff of the production of powder metallurgy products, knowledge and training in security measures . In order to ensure safety in production technology of powder metallurgy products , we must implement the following basic measures .

( 1 ) Production of powder metallurgy products, workplace arrangement according to the requirements of modern hygiene , styling equipment should be in accordance with the process design configuration , leaving the channel for use by people and vehicles , shall be equipped with a table and opening the fence . Process equipment and lifting and transport equipment active area where the danger should be installed on the column cover .

( 2) The exhaust gas is more dust and powder metallurgy equipment and the workplace must be dust cover and install ventilation systems , into the atmosphere of the gas to be purified.

( 3) The furnace section must ensure full ventilation in order to exhaust heat. If the stove Safety in separate room or operating table , will have to consider installing ventilators and exhaust hood .

( 4 ) vibration isolation device must be installed on the ground , cover shaker, mixer and other equipment must cover from the sound-absorbing material , and these devices installed in the seclusion room .

( 5 ) plating section must be filled with a special solution bucket to fall in the electrolyte when the workers' skin , timely and electrolytes. In addition , it should be taken into account from the chromium electrolyte can groove , trough containing cyanide electrolyte and acid-base extraction tank vapors were in and out .

Compared metal injection molding with hot die forging technology

MIM(metal injection molding) is a small or no cutting process(also called near net-shape). Compared with hot die forging technology, what advantages do MIM? ZCMIM company had made a general analysis as following:

1. The precision of powder metallurgy components is much higher than hot die forging technology.

2.    Powder metallurgy can save material and control the weight accurately

3.    Metal injection mold MIM process only need one set of molding tooling and one set of forming tooling, but hot die forging must need two or more molding tooling and one set trimming tooling.

ZCMIM talk about powder metallurgy powder quality control from MIM products

From powder metallurgy products to talk about metal powder quality control mainly can be divided into two aspects, namely, perfecting the evaluation system of the powder and attentively listen to customers needs.

1.        perfecting the evaluation system of the powder

Mixer - > granulation - > feedstock rheological properties - > feedstock torque - > injection molding - >sintering->product  performance - >  microstructure

2.        attentively listen to customers needs

Ø  recommend suitable MIM material

Ø  provide t MIM technology support

Ø   make performance analysis

Ø  offer MIM marketing information support

ZCMIM is not a manufacturer of metal powder, just hope that through above introduction of metal powder quality control to let more people be familiar with metal powder metallurgy technology, achieving a deeper understanding of metal powder metallurgy process.