Defects in stainless steel powder metallurgy products

Stainless steel powder metallurgy products, injection molding defects in blank mostly in the process of injection forming. Some of the defects of injection molding are visible to the naked eye, and some may appear in the subsequent desorption or sintering process, but also to be traced back to the injection molding process. Therefore, the quality control of stainless steel powder metallurgy products is very important.

Stainless steel powder metallurgy products injection forming slab defects: appearance observed flying edge, foaming, corrugated surface, layered or skin, depression, and deformation of surface black spots, the green strength is low and the operation of die sticking. The causes and influencing factors of these defects are various, among which the injection temperature and injection pressure are the key factors.

By adjusting the injection temperature and injection pressure, most of the defects can be solved. When the temperature and pressure of the adjustment to some defects change, further tracing to the binder system is the right choice, powder and a node agent mixed refining homogeneous degree, feeding with or without contamination, moisture absorption and moisture factors, also check the mold cavity design, the sprue, distributary channel and the gate design is reasonable.

In short, injection molding normal operation and high quality injection molding compacts, many influencing factors to in practice constantly explore and summarize, accumulate experience, to the problems are compared with the exact analysis and judgment, and make timely adjustments.