在铝件上加工螺纹孔,原为攻丝后再装配双头螺柱,结果时常因螺纹烂牙而报废。现在我们采用加工底孔后,再用双头螺柱自攻新工艺,从而避免了烂牙,提高了联结强度。螺纹自攻是一种无切屑加工方法,它依靠材料的塑性变形来形成牙型。在自攻过程中,工件部分材料受螺柱牙顶的挤压,材料沿晶格的晶面滑移,添充到螺柱的牙槽内, In the aluminum parts on the processing of threaded holes, the original tapping assembly of studs, the result is often scraps of teeth and scrapped. Now we use the bottom hole after processing, and then stud stud self-tapping new technology, thus avoiding the rotten teeth and improve the bond strength. Thread self-tapping is a non-chip processing methods, which rely on the material plastic deformation to form teeth. In the self-tapping process, the workpiece part of the material by the top of the screw extrusion, material along the crystal lattice surface slip, added to the stud of the alveolar,