Thread rolling process of high-strength bolts

Generally speaking, high-strength bolts are formed by cold working. Rolling thread is a processing method that uses the principle of plastic deformation to form helical teeth into high-strength bolts. (That is, thread rolling board) High-strength bolt is a kind of high-strength bolt formed by the principle of plastic deformation and high-strength bolt. This process uses a rolling die with the same pitch and shape as the machined high-strength bolt thread (ie, backing plate), and the cylindrical blank is extruded during the construction process to make the blank continuously rotate. The ultimate goal is to transfer the contours above the roller die to the billet of high-strength bolts to form threads. (Guide: What are the general parameters of ball screws)

For rolling thread processing, it should be noted that the rolling speed should not be too high, which will reduce the efficiency and cause separation or derailment on the surface of the high-strength bolt thread. If the number of rolls is too small, it is not conducive to the formation of high-strength bolt threads, and the thread diameter is easy to lose roundness. The initial pressure of rolling is very high, in this state, the life of the die will be greatly shortened.