Warm press forming method in high density and low temperature for powder of stainless steel

Abstract

A low-temp pressing technology for manufacturing high-density stainless steel part by power metallurgy of stainless steel powder (less than 147 microns in granularity) includes proportionally mixing stainless steel powder with low-temp lubricant, heating die to 80-100 deg.C, spraying EBS wax powder onto inner surface of die by electrostatic spray, preheating said mixture to 70-90 deg.C, loading it in die, and die pressing under 600-800 MPa.

Description

technical field [0001] The invention relates to powder metallurgy technology, in particular to a high-density low-temperature warm-press forming method of stainless steel powder. Background technique [0002] The advantage of using the traditional powder metallurgy method to produce stainless steel parts is that it can produce final shape or near-net shape powder metallurgy parts at a lower cost, which can realize less cutting and no machining, but the disadvantage is that the density of the parts is not high, and the corrosion resistance and mechanical properties are reduced. . Although the stainless steel parts produced by isostatic pressing and injection molding have high density, their application is greatly limited due to the complicated process and high cost. The warm-pressing process, which was successfully developed in the 1990s and has been industrialized, not only overcomes the shortcomings of low part density, but also has the advantages ...

AI Technical Summary

Problems solved by technology

These patent-protected powders are not only very expensive, but also have very strict requirements on the operating temperature, that is, the temperature range is required to be controlled at ±2°C, which requires a specific temperature-pressure system to complete, and these temperature-pressure systems are subject to Patent protection, so the equipment investment of the temperature and pressure production line is very large