According to GB / T 702-2008,the limit machining allowance of the pin is theoretically analyzed,and then three groups of samples are verified.The results show:the rough allowance of this sample should not be less than 5 mm,and the finishing allowance should not be less than 2 mm,the total allowance should not be less than 7 mm;in order to eliminate the influence of surface oxide on heat treatment,oxide should be completely removed in rough processing;purchase raw materials with small dimensional deviation and small out-of-roundness and small bending can also reduce the machining allowance;raw materials appear obvious bending,you can increase the straightening process before the machining;for non-key bearing pin,the heat treatment quality requirements are not high,can make heat treatment after simple rough turning.%依据GB/T 702-2008从理论上分析销轴保有加工余量,然后取3组试样进行了验证,结果显示:该试样粗加工余量不宜小于5mm,精加工余量不宜小于2mm,总加工余量不宜少于7mm;为了消除表面氧化皮对热处理的影响,粗加工时应完全去除氧化皮;采购尺寸偏差、不圆度和弯曲度较小的原材料也可以减小加工余量;原材料出现明显弯曲情况时,可以在加工前增加原材料校直工序;对于非关键受力销轴,对热处理质量要求不高时,可简单粗车后即进行热处理.
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