一、前言我厂多年生产弹簧钢丝都是在低速和部分压缩率很小的情况下进行的。4/560和5/407积线式拉丝机原设计成品线速度分别为2.5米/秒和3.8米/秒,部分压缩率23%左右。在这种条件下生产,拉拔温度高,模子损坏快,造成钢丝时效脆化、机械性能下降。而且由于频繁更换模子,产量也很低。所以一再降低拉拔速度和减小部分压缩 First, the foreword Our spring steel wire production for many years are in low speed and part of the compression rate is very small. 4/560 and 5/407 product line of wire drawing machine design speed of 2.5 m / s and 3.8 m / s, the partial compression rate of about 23%. Under the conditions of production, the drawing temperature is high, mold damage quickly, resulting in steel aging embrittlement, mechanical properties decline. And due to frequent mold changes, the yield is low. So repeatedly reduce the drawing speed and reduce the part of the compression