Pipe Threading Machine

Thread rolling is a chip-less cold forming process. A plain cylindrical blank, with a diameter partway between the major and minor diameters of the finished thread, is rotated and squeezed between cylindrical type hardened steel dies whose working surfaces are the reverse of the thread form to be produced. The threads of the die penetrate the surface of the black as it rolls between them, displacing material to form the roots of the threads, and forcing the displayed material readily outward to form the crests. Unlike other threading processes, no material is wasted.