粉体および粉末冶金
Online ISSN : 1880-9014
Print ISSN : 0532-8799
鉄系粉末金型潤滑成形法の最適化と抜出し挙動の動的および静的摩擦解析
上田 勝彦町田 輝史岩切 誠深川 浩一
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48 巻 (2001) 10 号 p. 907-914

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The present paper describes a new evaluation for ejection behavior in iron powder compacting process and optimum die-wall lubrication conditions. In the new method, ejection force is broken down to static friction force and kinetic friction force, which make it possible to explain ejection behavior more clearly. The incremental rate of kinetic ejection force is more important for surface quality of compacts than the value of static ejection force. Among three lubricants used, zinc stearate showed the highest static ejection force but the lowest incremental rate of kinetic ejection force. It also showed an excellent surface quality of the compacts. Characteristic crystalline structure gave a low shear strength, which contributed to decrease the kinetic friction. In the die-wall lubrication method, the projected area rate of lubricant particles should be 90% or more, therefore, the multiple coating method which is repetition of short time shot is requested.

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© 社団法人粉体粉末冶金協会
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