在挤压高强度材料的内螺纹时,选择合适的切削液,降低挤压温度、减小挤压扭矩、提高工件质量、延长丝锥寿命,起着重要的作用。我校化学化工系,根据挤压内螺纹中扭矩大(为切削丝锥的5-6倍)、温度高、润滑困难的特点,研制出适用于挤压高强度材料内螺纹的SG-Ⅱ型极压切削油。其配方容积比为:氯化石蜡40%,硫0.5%,磷0.2%,氯0.8%(指除了氯化石蜡以外其它添加剂中的含氯量),总含氯量17.6%,基础油(5号机械油)40.9%。作者用扭矩传感器和自然热电偶,对采用不 In the extrusion of high-strength materials, the internal thread, select the appropriate cutting fluid, lower extrusion temperature, reduce extrusion torque, improve workpiece quality, extend tap life, plays an important role. According to the characteristics of high torque (5-6 times of cutting tap), high temperature and difficult lubrication, the SG-Ⅱ type electrode used for extrusion of high-strength internal thread Press cutting oil. The formula volume ratio is: 40% of chlorinated paraffin, 0.5% of sulfur, 0.2% of phosphorus and 0.8% of chlorine (chlorine content in other additives except chlorinated paraffin) No. engine oil) 40.9%. The author uses a torque sensor and a natural thermocouple, to adopt no