The die is a standard tool for machining and calibrating external threads. The outer blade has a wide blade edge and large friction. When machining the external thread of high-strength alloy steel such as 40Cr and 35CrNiMo (tempering hardness is 240-280HB), it is prone to stagnation. Since the blade inclination angle is small, chip removal is difficult, and the workpiece is easily damaged, so the high strength stud should be corrected when processing.
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