用丝锥在不锈钢上攻螺纹是金属切削加工中较困难的工序,在攻丝过程中,除因丝锥形式及参数、切削速度及切削液等选择不当而影响螺纹加工质量及丝锥使用寿命外,内螺纹底孔直径选得太小也有可能造成切屑堵塞而导致内螺纹中径过大,或因螺纹扭矩过大导致丝锥卡死和折断,因此本文推荐选用下述公式计算不锈钢内螺纹底孔直径d: Taps on the stainless steel tapping thread is a more difficult process of metal cutting in the tapping process, in addition to the tap form and parameters, cutting speed and cutting fluid and other inappropriate choice affect the quality of thread processing and tap life, the internal Threaded bottom hole diameter is too small may also result in chip jamming caused by the internal thread diameter is too large, or because the thread torque is too large cause the tap stuck and broken, so this article recommends the use of the following formula to calculate the stainless steel female bottom hole diameter d :