To provide a manufacturing device of a torsion beam for a rear wheel suspension system of a car.
Upper and lower pad dies 10, 12 to press a square-section part 24b of a beam 24 prior to forming by the upper and lower dies 2, 4 are provided on both sides of the upper and lower dies 2, 4 to be mounted on a press machine. A cam 20 having a function of advancing into a pipe by the action of a hydraulic cylinder and maintaining the inner side shape of the square section part 24b and an extension-section part 24c is provided on both axes given when forming the pipe 14. A perfect symmetrical shape in the right-to-left direction can be obtained by a single step even when manufacturing the beam 24 of different sectional shape by part by preventing any torsion or wrinkles generated in the already-formed square section part 24b and the extension-section part 24c when forming the "U-shaped" or "V-shaped" section part 24a and extension-section part 24c by the upper and lower dies 2, 4.
Masato Tsuda
Tetsuji Nakamura
Katsuyuki Tomita
Husband