2732 低炭素鋼の冷間鍛造の表面ポーラス化による潤滑(S24-1 塑性加工(1),S24 塑性加工の動向とその展開)

概要

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In cold forging of steels, metal soap on zinc-phosphate coating is excellent lubrication system. However, the system is not only less productive, but produces hazardous wastes from baths. In this study, an alternative lubrication system based on surface porosification of workpiece is proposed. Low carbon steel rings were held at 673-973K in air, then held at the same temperature in hydrogen gas. The surface oxide layer formed in air turned into porous layer by chemical reduction. The ring-compression test was performed under various lubrication conditions at room temperature to evaluate friction coefficient in cold forging. It is found that machine oil or grease on the interface decreases friction greatly. The porous surface enhances the decrease, especially in the cases of heavy deformation. The friction coefficient on the porous surface with liquid lubricant is almost comparable to that on phosphate coating.
社団法人日本機械学会の論文
2007-09-07