There are two methods of machining out internal thread and external thread on the work piece, respectively are cutting processing and rolling processing.
Cutting processing method: thread cutting, generally refers to with forming cutting tool or grinding on the work piece machining thread method, mainly include the turning, milling, tapping, mantle fiber, grinding etc.
1, thread turning, turning thread on a lathe can use forming tool or chaser. By forming tool turning thread, due to its cutting tool structure is simple, is only suitable for single piece and small batch production of thread work piece; With chaser turning thread, high production efficiency, but its cutting tool structure is complex, and only applicable to middle and mass production turning teeth short thread artifacts.
2, thread milling, in the thread milling machine by disc cutter or comb milling cutter for milling. Disc cutter is mainly used for milling screw rod, worm and other artifacts on the trapezoidal external thread; Comb milling cutter for milling ordinary internal, external threads and taper thread, is appropriate for batch production general accuracy thread work piece.
3, thread grinding, use cast iron etc. softer material to make nut type or screw rod type thread tool, proceed forward and reverse rotation grinding of work piece have been processed thread exists screw pitch error part, in order to improve the accuracy of screw pitch.
4, tapping, it is to use a certain distance to tap screwing in the work piece on the preboring in the bottom hole machining internal thread. Mantle fiber, use threading die cut-out external thread at barstock (or pipe material) work piece. It is suitable for machining small diameter internal thread. Tapping and mantle fiber can use manual operation, also can use lathe, drilling machine, tapping machine and diehead threading machine.
Rolling processing method: screw thread rolling, use forming rolling mould make work piece produce plastic deformation for the thread processing method. This processing method has the advantage that its surface roughness is less than the cutting way of thread. After rolling thread surface because cooling hardening can improve the strength and hardness, compared with cutting processing, high material utilization, productivity is growing exponentially.