| 摘要 |
PURPOSE: A cold forging apparatus for a connection pipe of a connection unit for vehicle hydraulic brakes is provided to quickly discharge air remaining in a molding chamber of a fixed mold through a gap between a case and an inner pin which form a punch, thereby eliminating an air mark on upper and lower sheet sides. CONSTITUTION: A cold forging apparatus for a connection pipe of a connection unit for vehicle hydraulic brakes includes first, second, third, fourth, and fifth forging parts(30,32,34,36,38). Each forging part includes a fixed mold(10,12,14,16,18) and a punch(20,22,24,26,28). Each of the punches(24,26) included in the third forging part and the fourth forging part is divided into a case and an inner pin, and a gap for air discharge is formed. Each of the inner pins included in the punches of the third forging part and the fourth forging part is divided into a punching part and a supporting part, where a protrusion from a case is suppressed by the hooking of the case and a hooking edge. |
