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1983年,我厂在汽车轮胎螺丝套螺母盲孔攻丝时出现严重问题,螺纹乱扣严重,表面粗糙度高,丝锥折断率高,形成停产局面。对攻丝情况进行分析: 1.粘刀:刀瘤密集,呈层状熔化态,紧紧粘在前刀面及刃背处,刃背处居多,且多散布在丝锥校正部分4～5扣处。切削锥面可见摩擦熔痕。刀瘤与丝锥粘结紧密,极难去除。 2.掉扣:有时攻进几扣即产生掉扣。即使勉强攻完,表面粗糙度也不符合要求。
In 1983, I plant a serious problem in tapping the blind hole of the nut of the car tire screw thread, serious thread chaos buckle, high surface roughness, high tap breakage rate, the formation of the shutdown situation. Analysis of the tapping: 1. Sticky knife: Knife dense, layered molten state, tightly stuck in the rake and back edge at the blade back majority, and more scattered in the tap correction section 4 to 5 buckle Department. Cutting cone visible friction melt marks. Tumor and tap tightly bonded, extremely difficult to remove. 2. Drop buckle: Sometimes a few buckle into the buckle. Even barely finished, the surface roughness does not meet the requirements.