The working principle of the tooth-rubbing die is as follows: after being synchronized by the synchronization mechanism, the two opposite tooth-rubbing dies installed on the sliding table are driven by oil pressure or servo motor to move linearly in opposite directions, the dies are dressed into gradually-cut tooth shapes, and the workpiece is supported by the front and rear centers, and the machining position of the workpiece can be conveniently adjusted through the displacement function of the front and rear centers. The relative movement of the upper and lower dies drives the workpiece to rotate and gradually extrude the workpiece, and finally exits after being shaped. The forming accuracy and stability of the spline are obtained by the preset rigid distance between the upper and lower tooth-rubbing dies.

Tooth rubbing machine is a kind of processing equipment for the outer surface of cylindrical workpiece. The working principle of thread rolling is that two pieces are the same, and the thread rolling surface has the same tooth shape as the thread shape of the bolt. When the thread rolling plates move mutually, the bolt blank between the two thread rolling plates is screwed. The thread of a bolt can be processed by one round trip of the washboard, and the speed is quite high. Thread rolling is mostly used for processing small bolts.