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本文指出目前大尺寸多锥内螺纹丝锥攻丝困难,质量差。改进后的新丝锥为单锥,切削锥为四扣,螺纹型面大,刃口锋利,磨擦力小,入扣容易。校正部分比原丝锥缩短5～20毫米。在丝锥制造工艺中采取了控制回火温度和控制硬度两项措施。对锻造刀具的毛坯,注意控制碳化物的偏析。采用这种新丝锥攻丝操作中应注意控制偏摆量,最大值不应超过0.6毫米;加大螺纹底孔,采用螺纹内径上限;采用新的冷却液——极压油。图3。
This paper points out that the current large-size multi-taper tapping tapping screws, poor quality. The improved new tap is a single cone, the cutting cone is four buckles, the thread profile is large, the edge is sharp, the friction force is small, and the buckle is easy to buckle. Correction part of the shortened than the original tap 5 to 20 mm. Taps in the manufacturing process to take control of tempering temperature and hardness control measures. Forging the rough tool, pay attention to control the segregation of carbide. The use of this new tap tapping operation should pay attention to control the deflection, the maximum value should not exceed 0.6 mm; increase the bottom of the thread, the thread diameter limit; the use of new coolant - extreme pressure oil. image 3.