When the thread is processed by circular die, it is semi cut and semi extruded. The inner diameter and the middle diameter of the die are cutting parts, especially the inner diameter of the die. They must bear a large cutting force, so they must have certain strength and cutting ability. Considering that there should be a certain gap between the screw and the screw hole, the size of inner diameter and middle diameter should be smaller than that of the inner diameter and middle diameter of the screw. The thread diameter of jmM0.8 is D =0.584 mm, and the inner diameter of the die is D. . = = 0.55 mm, M0.8 thread diameter D in =0.67 mm, the middle diameter of the die should be D m.x= 0.67 mm in the plate, generally determined in 0.66 to 0.67 mm. In actual production, the die wear caused by medium diameter wear is very small, so the wear of medium diameter can be considered less in design. But if the middle diameter is too small, the pushing force of the thread will increase, so the middle diameter of the die should not be designed too small. The outer diameter of thread is obtained by plastic deformation of metal during extrusion under cutting. In order not to cause metal blockage to break the workpiece, the outer diameter of the die should not be allowed to work. There should be a gap between it and the cutting. For cutting M0.8 threads, the minimum outer diameter of the die is 0.8 mm, and the general outer diameter should be increased by 0- 02^0.03 mm.

Hangzhou GSR-Threads Tools Co.,Ltd

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