标准紧固件六角螺栓头部热锻成型所用的凹模,以往采用切削加工及型孔冷挤压、配芯等工艺;工序繁琐,周期长、质量差,我厂经反复试验,采用温热挤压型腔工艺(所用材料为3Cr2W8V高强度合金工具钢)取得了成功。并于1979年投入生产。一、工艺介绍 1.温热挤压成型特性: 黑色金属温热挤压在锻压工艺中的加热温度是750～900℃,当3Cr2W 8V Standard Fastener Hex head bolt forging die used in the die, the past, the use of cutting and cold extrusion hole, with core and other processes; tedious process, long cycle, poor quality, I plant after repeated tests, the use of warm Extrusion cavity process (the material used for 3Cr2W8V high-strength alloy tool steel) has been successful. And put into production in 1979. First, the process of introduction 1 hot extrusion molding characteristics: black metal hot extrusion forging process in the heating temperature is 750 ~ 900 ℃, when 3Cr2W 8V