what is the Thread bar making machine and screw thread rolling machine?

tie rod hread rolling machines are used to produce screws, bolts, and studs. Thread rolling is a cold-form forming operation used to form external screw threads in a blank. During the thread rolling process, a hard die is pressed onto a rotating workpiece (also called a blank) that is attached to the tie rod thread rolling machine.

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Detailed photos of screw thread rolling machine:

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