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Current Status and Prospects of Powders for Oil Bearings (II)
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Because most of the domestic restored iron powder is subject to the sealing of the iron powder recovery furnace, the direction of the atmosphere protection, the accuracy of temperature control, etc.; the oxygen content of the product powder is usually around 0.5%; the carbon content is usually at 0. 05. About %; greatly reduced the compactability of the powder; and greatly affected the sintering activity; reduced the crushing strength, while the imported healing powder was controlled at 0.3% and 0.02%.
4. The proportion of loose clothing is high.
The particle size distribution of the powder will have a great influence on the pine ratio. Because of the damage and the effect of particle size distribution, the fine powder content in the iron powder, especially the Panasonic 305 mesh sieve, is usually higher than that of the domestic restoration powder. And the shake is large; it brings unsafe factors to the mass production. Foreign countries usually use the graded powder to participate in the distribution according to the certain size; to ensure the stability of the pine ratio and activity.
5. The oil content is low.
The amount and size of the pores inside the iron powder particles directly affect the oil storage capacity and oil discharge speed of the oil-bearing bearing. The internal pores of the scale-recovery powder are less and fine. The eye-catching purple chamber is 15~30%; The particle porosity of iron powder can reach more than 40%. For ordinary iron-based oil-bearing bearings; considering the strength of the product; its density is usually 5.90~6.10g/cm3; the closed porosity of domestic powder is usually 6~8 %; and the imported powder is 3.5 to 4.5%.
Totally; domestically produced iron powder has been widely used in the bearings that are usually needed; but with the gradual promotion of 5 and 6 precision bearings; the OEM also needs to improve the defective product rate to the ppm level; the quality of the iron powder is restored at this stage. The level is no longer satisfactory; we expect the iron powder production company to make progress in the following areas:
1. Improve the crushing equipment; carry out the spiral mixed powder batching machine; adhere to the irregularity of the shape of the iron powder particles as much as possible,
2. Ensuring a stable iron scale; and having a large enough mix; improving the stability between batches,
3. Make sure that the fine powder fraction is within the steerable range; you can get a low slack ratio without increasing the coarse powder fraction.
4. Improve the ball milling process; reduce the content of flakes; improve the internal porosity of the particles and obtain larger pores,
5. Improve the packaging of product powder; reduce the problem of oxidation and agglomeration during transportation and storage.
Second, atomized copper powder because of the low friction coefficient of copper and excellent anti-seizure; pure copper powder, bronze powder and reconstituted iron powder mixed or used alone; used in the manufacture of a wide range of applications of iron-copper-based, copper-based oil-bearing bearings; The annual demand is appropriate and ambitious. Follow the recognition of environmental protection; 6-6-3 bronze powder is gradually withdrawing from the city. 缃馔垡ä¸ç¼ƒé¦”åž¡ "æ°–æ’¬ç ˜é‚¸(9)┥7.åˆèšåˆèšé¸±. Domestic these years Many copper powder production companies have been built; but the products are still far away from the world-famous companies such as OMG, American Bronze Company, and Japan Atomization Co., Ltd., in terms of the current application situation; domestic atomized pure copper powder The main distances are:
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