此外，他们认为，对于攻丝存在一个临界切削厚度(螺纹深度)值，在临界切削厚度的范围内，攻丝能降低攻丝扭矩。
In addition, they believe, for tapping there exists a critical cutting thickness (thread depth) value of the critical cutting thickness within the tapping can reduce the tapping torque.
本发明涉及一种冲压模内电动攻丝设备，属于机械加工领域。
The invention relates to an electric threading apparatus in a punching die, belonging to the machine finishing field.
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