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对磨削、铣削加工得到的淬硬钢SKD11表面完整性进行了研究.通过对比干磨削和干铣削加工工件表面层的金相组织.发现干铣削时,铣刀后刀面磨损引起的铣削温度升高对工件表面完整性有很大的影响.随着加工温度升高,工件表面逐渐产生回火马氏体,这是造成工件表面硬度下降的主要原因.进一步的试验表明,如果选用合适的刀具和加工参数,可以得到较好的表面完整性;如果采用较小铣刀的磨钝标准可以避免出现回火马氏体.对淬硬钢进行精加工时,以铣代磨是完全可行的.
The surface integrity of hardened steel SKD11 obtained by grinding and milling was studied.The microstructure of the surface layer of workpiece was compared by dry grinding and dry milling.It was found that the milling induced by the flank wear of the milling cutter The temperature increase has a great influence on the surface integrity of the workpiece.With the increase of processing temperature, the surface of the workpiece gradually produce tempered martensite, which is the main reason for the decrease of surface hardness.Further experiments show that if the appropriate selection Of the tool and processing parameters, you can get a better surface integrity; if the blunt standard with a small cutter can avoid the emergence of tempered martensite. Hardened steel for finishing, milling instead of grinding is entirely feasible of.