116 バインダとしてPVAあるいは寒天の水溶液を用いた鉄系粉末のグリーン加工(粉末成形とその評価)

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The powder metallurgy is advantageous for near net shape manufacturing.. However, because of an increasing demand for the parts with more complex shapes in recent years, some material removal processes are necessary for formed parts. As such, the machinability of sintered iron is an important topic. The metal removal process used for powder metallurgy parts is usually applied to sintered compacts. However, a removal process for the powder compact prior to sintering (referred to as "green compacts"), which is known as green machining, has been attracting attention lately. In order for green machining to gain full acceptance, it is necessary that sintered parts produced by this method have the same mechanical strength as sintered parts produced by conventional sinter machining. In the first study, we compared the mechanical strength of a cylindrical compact formed from ferrous powder, which was drilled and then sintered, with the mechanical strength of a part that was sintered and then drilled to produce the same shape. The mechanical strength was evaluated according to the radial crushing strength test (JIS-Z-2507). In the present study, a test piece was produced with PVA (polyvinyl alcohol) and agar was added to the ferrous powder as a binder. It was found that the cutting force (thrust and torque) and the chips from the drilling processes on green compacts produced using PVA or agar as the binder were considerably smaller than the results of a green compact made of ferrous powder alone.
一般社団法人日本機械学会の論文
2009-11-06

116 バインダとしてPVAあるいは寒天の水溶液を用いた鉄系粉末のグリーン加工(粉末成形とその評価)

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