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挤压成形攻丝法与普通攻丝法的不同之处,就在于它是成形挤压出内螺纹,而不是切削加工成的。然而,这种无屑螺纹加工的理论绝不是从未有过的,因为有些不太成功
The difference between the extrusion tapping method and the ordinary tapping method is that it is shaped to extrude the internal thread instead of being machined. However, this theory of threadless threading is by no means unprecedented, as some are less successful