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Defects Generated in Powder Metallurgy Compacts and Their Differences from Those in CNC Machining

2022-01-14

　　During the pressing process, powder metallurgy parts may develop green-body defects for various reasons, leading to the rejection of these parts. In the production of powder metallurgy parts, the higher the material density, the better its physical and mechanical properties will be. In other words, the density and distribution of the green body in powder metallurgy parts will determine the performance of the final product.

　　Therefore, during the debugging and pressing processes of powder metallurgy dies, the density of the green compact is a key parameter that must be monitored. When conducting density measurements, it’s important to differentiate between green compacts with varying structures and requirements. If the discrepancy arises from issues in die design or manufacturing, the error can often be corrected by adjusting the processing parameters, allowing for remediation. However, if the problem cannot be resolved through such adjustments, the only option left is to scrap the die.

　　For stepless cylindrical compacted parts, adjusting the powder charging, modifying the pressing pressure, or extending the holding time can all help to adjust and stabilize the axial dimensions. For stepped compacts, adjusting the forming position of the combined punch, the powder charge ratio for each step, and the running speed of the floating punch can all influence the height dimension of the steps.

　　It was found from the finished products that the shapes of parts manufactured by CNC machining and those made by powder metallurgy are quite similar. However, it is evident that CNC machining is more expensive than powder metallurgy. Powder metallurgy is a manufacturing process technology used to produce metal powders or to use metal powders as raw materials, which then undergo forming and sintering to create metallic materials, composite materials, and various types of products.

　　CNC machining refers to a manufacturing process in which parts are machined on CNC machine tools. Because the entire machining process relies on digital information to control the movement of both the workpiece and the cutting tool, this method can effectively address challenges such as diverse part types, small batch sizes, complex geometries, and high precision requirements, while also enabling automated machining.

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What are the powder metallurgy techniques for powder production?

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