下料是生产弹簧的首道工序,我厂生产的铁路HT系列螺旋弹簧丝径为30mm,材质为SUP6(日本弹簧钢)。原采用Cr12钢制造断料刀,由于Cr1_2钢存在碳化物分布不均,有严重网状堆集和带状,增加了钢的脆性,冲击韧性差,在服役期间极易脆裂。对此,我们通过实验,总结出用60Si2Mn钢板簧片代替Cr12钢制造断料刀,消除了因冲击载荷较大而产生崩裂,防止了 Unloading is the first process of producing spring. The wire diameter of HT series coil spring produced by our factory is 30mm and the material is SUP6 (Japanese spring steel). Cr12 steel used to make the original cutting knife, due to the uneven distribution of carbides Cr1_2 steel, a serious network of reticular accumulation and band, an increase of steel brittleness, impact toughness, very brittle during service. In this regard, we through the experiment, concluded that the use of 60Si2Mn reed instead of Cr12 steel reed cutters, eliminating the impact load caused by the larger crack, to prevent