无槽丝锥是利用金属的塑性变形挤出内螺纹的。无槽丝锥的锥部是完整齿形的锥形螺纹,工作部分的横断面为曲线三棱形。无槽丝锥的优点是:1.由于无槽,丝锥截面大,挤压时不产生切屑,挤压力小,所以不易折断,耐用;2.挤压螺纹效率高、质量好,采用无槽丝锥一次挤成,并且不易烂牙,挤压螺纹比切削螺纹强度高。 Slotless tap is the use of plastic deformation of the metal extrusion of the internal thread. The taper of a slotless tap is a complete serrated conical thread and the cross section of the working section is a curved triangular prism. The advantages of slotless tap are: 1. Because of no slot, tap cross-section, extrusion does not produce chips, the extrusion force is small, so not broken, durable; 2. Extrusion thread high efficiency, good quality, Once squeezed into, and not easy to rotten, extruded thread thread cutting strength than high.