一、问题的提出 1981年12月下旬我厂在生产英制1/2″和5/8″螺栓时,只生产了9.34万件,主要模具就消耗了顶锻模58只,缩径模9只,W18C4V的氮化模16只,用YG20C的合金模4只,切边模28只,模具成本费共化去1598.32元,平均每万件产品模具成本费计171.13元,成本费实是很大的,因而要求提高冷镦模具的使用寿命。经过质量分析,初步认为存在以下几个方面:(1) 干石灰拉拔粉剂质量不好,(2) 拉拔 First, the issue raised In late December 1981 I plant in the production of British 1/2 “and 5/8” bolt, only the production of 93,400, the main mold on the consumption of the top die 58 only, reduced diameter die 9 , W18C4V nitride mold 16, with YG20C alloy die 4, trimming die 28 die cost of co-ownership to 1598.32 yuan, the average cost per diem mold costs 171.13 yuan, the cost is really great , Thus requiring to improve the service life of cold heading die. After quality analysis, the initial view that there are the following aspects: (1) dry lime powder quality is not good, (2) drawing