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用无槽加强丝锥(发明证书号№2120293/27)以塑性变形方法加工内螺纹,与切削螺纹方法比较,具有如下优点:根据具体条件刀具寿命提高2—10倍以上;已加工螺纹的剪切强度平均提高20～22%;这种丝锥的横截面强度高于普通丝锥(因无容屑槽);加工时无切屑,这对于自动化生产和盲孔加工特别重要;可以在不锈钢、耐热钢、钛合金、可锻铸铁、有色金属及其合金上加工螺纹,且精度好、效率高。无槽加强丝锥适用于大规模、大批量和成批生产,也可用于当切削丝锥加工时工艺上有困难的地方。这种丝锥与一般无槽丝锥(18839—73)的主要区别在于其螺纹部分横截面形状
Machining the internal thread with the plastic groove without the tightened tap (Certificate No.22120293 / 27) has the following advantages compared with the cutting thread method: the life of the tool is increased by 2-10 times according to the specific conditions; the shear of the processed thread The strength of the average increase of 20 to 22%; this tap the cross-sectional strength higher than the ordinary tap (due to no chip flute); processing no chip, which is particularly important for automated production and blind hole processing; stainless steel, heat-resistant steel , Titanium, malleable iron, non-ferrous metals and their alloys on the processing of threads, and accuracy, high efficiency. Slotless taps for large-scale, high-volume and mass production, can also be used when cutting tap processing process where there are difficulties. The main difference between this kind of tap and the general slotless tap (18839-73) lies in its thread part cross-sectional shape