Distortion control of pull rod of short-stress line rolling mill in ion nitriding

doi:10.13251/j.issn.0254-6051.2022.10.048

Abstract

Abstract: Influence of various factors including the processing residual stress of the short-stress line rolling mill, the method of mounting, multiple heating and cooling on the distortion of rod-shaped workpieces caused by ion nitriding was investigated. The results show that the most important factor affecting the nitriding distortion is the processing stress of the pull rod, so for long rod-shaped workpieces, a reasonable stress relief process before finishing and nitriding can effectively control the nitriding distortion. In addition, slower heating, cooling and vertical suspension clamping methods can also reduce nitriding distortion. For long rod-shaped workpieces which requires multiple nitriding to meet the technical requirements of the drawings, rotating the workpiece by 180° after each nitriding can effectively control the nitriding distortion.

Key words: ion nitriding, nitriding distortion, distortion control

CLC Number:

TG156.8⁺2

Sun Huayu, Zhao Yuxia, Li Shuangxi. Distortion control of pull rod of short-stress line rolling mill in ion nitriding[J]. Heat Treatment of Metals, 2022, 47(10): 283-289.

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