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What are the precautions for stainless steel powder metallurgy
The common forming method of powder metallurgy materials is to compress metal powder in a rigid closed mold, which has high cost. Due to the poor fluidity of the powder and the influence of friction, the dense density is usually low, the distribution is uneven, the strength is not high, and it is difficult to move along the pressing direction Form thin-walled, elongated and variable cross-section products. Therefore, the structure of stainless steel powder metallurgy press-formed parts should pay attention to the following matters.
1. Avoid local thin walls, compact with powder and prevent cracks.
2. Avoid grooves and holes on the side wall to facilitate compaction or reduce the remaining blocks.
3. Try to use simple and symmetrical shapes to avoid excessive cross-sectional changes and narrow grooves, spherical surfaces, etc., so as to facilitate molding and compaction.
4. Avoid increasing the cross-sectional area along the pressing direction to facilitate pressing. The connection of each wall should be rounded or chamfered to avoid sharp corners, which will help compaction and prevent stress from being concentrated in the mold or press block.
Powder metallurgy molding is one of the basic processes of powder metallurgy stainless steel production. The purpose is to make loose powder into semi-finished products or finished products with predetermined geometric shapes, sizes, density and strength. Powder metallurgy molding technology is a processing method that uses a mixture of metal powder and composite powder as raw materials to prepare metal oxide materials and composite materials through molding and sintering operations.
These are the precautions for the structure of powder metallurgy pressed parts. Stainless steel powder metallurgy is a rapidly developing new technology and new process, which has been widely used in power tools, machinery, automobiles, chemicals, light industry, geological prospecting, transportation and other fields .