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Briefly describe the processing methods of internal and external threads
There are two main types of methods for machining internal and external threads on the workpiece: cutting and rolling.
Thread cutting generally refers to the method of machining threads on a workpiece with a shaped tool or abrasive tool, mainly including turning, milling, tapping, threading, grinding, grinding and whirlwind cutting. When turning, milling and grinding threads, the transmission chain of the machine tool ensures that the turning tool, Linktitle milling cutter or grinding wheel moves along the axis of the workpiece accurately and evenly for each revolution of the workpiece. When tapping or threading, the tool (tap or die) rotates relative to the workpiece, and the first formed thread groove guides the tool (or workpiece) to move axially. (Guide: A brief introduction to the knowledge of large hexagon head high-strength bolts)
Thread rolling refers to a chipless thread processing technology. The thread is formed by plastic deformation of the surface metal of the part blank by the forming rolling die. Thread rolling is generally performed on a thread rolling machine, a thread rolling machine or an automatic lathe with an automatic opening and closing thread rolling head, which is suitable for mass production of external threads of standard fasteners and other threaded couplings. The outer diameter of the rolled thread is generally not more than 25 mm, the length is not more than 100 mm, and the thread accuracy can reach level 2 (GB197-63). The diameter of the blank used is roughly the same as the pitch diameter of the thread being processed. Rolling generally cannot process internal threads, but for softer workpieces, non-slot extrusion taps can be used to cold extrude internal threads (the maximum diameter can reach about 30 mm). The working principle is similar to tapping. The torque required for cold extrusion of internal threads is about twice as large as that of tapping, and the machining accuracy and surface quality are slightly higher than that of tapping.
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