MULTI-PENETRATION COMPUTERIZED THREAD ROLLING SYSTEM

摘要

A thread rolling attachment includes a pair of opposed pivoting arms (4) each having a threading roll (2) attached to one end thereof. A wedge (12) is located between the other ends of the arms (4), and is linearly movable for controlling movement of the dies (2). A computer controller controls the rotation of a stepper motor which drives a ball nut and which causes axial movement of a ball screw. The ball screw is attached by a clevis. The computer controller is programmable for performing multi-penetration and for returning to a predetermined starting position close to the blank for reducing the threading cycle time. This device may be retro-fit on an existing pneumatic threading system by removing the pneumatic drive and attaching the stepper motor and ball screw and clevis and controller to the already existing system. The system also counts revolutions of one of the dies and if the number differs from an expected number then an alarm is sounded.