A roll forming machine refers to a machine that processes polished rods.
The roll forming machine is driven by a motor, the main shaft rotates through a transmission system, and is driven by a three-jaw chuck. Its main movement is the rotation of the workpiece, and the longitudinal feed movement and the radial feed movement are realized by the rolling head.
The workpiece passes through the center hole of the rolling head, and three rollers are uniformly distributed on the circumference of the rolling head, including one rolling wheel and two supporting wheels. Before work, the three rollers pass through the screw mechanism to make them radially approach and close to the workpiece, that is, centering. At the same time, the three rollers rotate in the same direction relative to the workpiece with the same helix angle (the direction of rotation is consistent with the spiral direction of the workpiece), and then roling wheel advances in position radially. When working, the workpiece rotates and the rollers are forced to roll relatively through frictional force, and under the action of axial force, the rolling head drives the tailstock carriage to move longitudinally along the guide rail of the bed. During the movement, the annular shoulder on the rolling wheel contacts the workpiece, the blank is squeezed, stress concentration occurs, and plastic deformation occurs, thereby forming a thread.