Powder metallurgy oil bearing: self-lubricating, low cost, high precision, flexible materials, but also pay attention to these problems!
Oil bearing processed by powder metallurgy process is a porous bearing made of metal powder or non-metal powder by pressing, sintering, shaping and oil immersion, etc. It has a wide range of applications in industrial and civil fields. So, what are the advantages of powder metallurgy bearings? What are the common problems and causes? This article will give you the answers.
The advantages of powder metallurgy processing oil bearing.
1, good self-lubrication performance. The porous structure of the powder metallurgy bearing enables it to store a large amount of lubricating oil, during operation, due to the temperature rise and pumping action, the lubricating oil will leak to the friction surface, forming an oil film, thereby reducing the coefficient of friction and wear. When the bearing stops running, the lubricating oil will flow back into the pores to keep the bearing sufficiently lubricated. Therefore, powder metallurgy bearings can run for a long time without adding lubricating oil, and are suitable for occasions where lubrication conditions are poor or it is difficult to add lubricating oil.
2. Low cost. Powder metallurgy bearing manufacturing process is simple, high utilization of raw materials, basically no cutting processing, saving material and energy consumption, reduce production costs. At the same time, because powder metallurgy bearings can reduce friction and wear, extend service life, and reduce maintenance costs, they have higher economic benefits.
3, high dimensional accuracy. The forming process of powder metallurgy bearings can achieve near-net forming or net forming, that is, directly pressing out the required size and shape according to the design requirements, without or without subsequent processing. This can ensure the dimensional accuracy and surface quality of bearings, improve assembly performance and operation stability.
4. Flexible material composition. Powder metallurgy bearings can be based on different working conditions and performance requirements, select different material combinations and proportions, and prepare composite materials with specific functions and characteristics. For example, anti-friction materials such as graphite, lead and tin can be added to improve self-lubrication performance; Alloy elements such as nickel, molybdenum and chromium can be added to improve strength and heat resistance; Magnetic or conductive materials such as iron and copper can be added to achieve special functions.
The causes of the problems often occur in the processing of oil bearing by powder metallurgy
Although powder metallurgy bearings have many advantages, there may also be some problems in the use process, affecting its normal work. Here are some common causes and solutions:
1, tile surface corrosion. This is because the lubricant contains corrosive substances such as moisture, acidic substances or impurities, resulting in chemical or electrochemical reactions on the bearing surface, forming corrosion products and reducing the surface quality and strength of the bearing. The solution is to choose the right lubricating oil, replace the lubricating oil regularly, keep the lubricating oil clean and dry, and avoid exposing the bearing to a corrosive environment.
2. Journal surface strain. This is because the fit clearance between the bearing and the journal is too small, or the relative movement between the bearing and the journal is too large, resulting in the bearing surface being subjected to intense friction and cutting, forming surface defects such as scratches, pits or burrs, affecting the lubrication and operation of the bearing. The solution is to choose the appropriate fit clearance, ensure a good fit between the bearing and the journal, avoid the relative movement between the bearing and the journal is too large, and regularly check and clean the dirt and impurities on the bearing surface.
3. Surface strain. This is because the clearance between the bearing and the coat is too large, or the fixing between the coat and the seat hole is not strong, resulting in relative movement between the bearing and the coat, resulting in the bearing surface being scratched and worn by the coat, forming surface defects. The solution is to choose the right fit clearance, ensure a good fit between the bearing and the jacket, strengthen the fixing between the jacket and the seat hole, and regularly check and clean the dirt and impurities on the surface of the jacket.
4, tile back fretting wear. This is due to the poor fit or fixing between the jacket and the seat hole, resulting in a small relative movement in the seat hole of the jacket, resulting in the friction and wear of the bearing back by the inner wall of the jacket, forming surface defects. The solution is to choose the right fit tolerance, ensure a good fit between the coat and the seat hole, strengthen the fixing between the coat and the seat hole, and regularly check and clean the dirt and impurities in the inner wall of the coat.
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