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自动螺母镦制机用冲头寿命短是个大问题。苏联巴利沃夫亚工科大学研究了Cr12M。钢制冲头寿命短的原因。认为冲头有加工痕迹,过渡部位不够圆滑,而某些支承面或某些端面有沟槽。用X光照相研究的结果表明:组织中残留了大量奥氏体(38％以下),因此冲头的疲劳强度和耐磨性低,而且冲头的硬度为HRc58～60。该所确定的冲头机械加工及热处理规范如下:冲头的支承面用转速n=630rpm,走刀量S=0.07mm/转,进行车削,端面用转速n=200rpm,切深t=0.5mm,手动进给车削,并用特殊的刀具修制冲头的轮廓,然后研磨消除车削痕迹。机械加工之后进行热处理,即1小时预
Automatic nut heading machine punch short life is a big problem. Soviet Union Bolivar Institute of Technology studied Cr12M. Steel punch short life reasons. The punch is believed to have machining marks, the transition is not smooth enough, and some of the bearing surfaces or some of the ends have grooves. The result of X-ray photography shows that a large amount of austenite (less than 38%) remains in the microstructure, so the fatigue strength and wear resistance of the punch are low, and the hardness of the punch is 58 to 60 HRc. The defined punch machining and heat treatment specifications are as follows: punch supporting surface with the speed n = 630rpm, the amount of S = 0.07mm / turn, turning, end face speed n = 200rpm, depth of cut t = 0.5mm , Manually feed the turning, and use a special tool to repair the outline of the punch, and then grinding to eliminate turning marks. After the mechanical processing heat treatment, that is 1 hour pre-