| 摘要 |
A twin drawing mold device is provided to increase productivity and reduce production costs by increasing forming force of outer panel-forming molds simply and promptly. In a twin drawing mold having a pair of upper molds fixed to both sides of a slider, a pair of lower molds which are fixed to positions on a moving bolster oppositely to the upper molds, and which have blank holders supported to circumferences of upper parts thereof, and cushion pins of which lower ends are supported to a cushion pad, and of which upper ends are connected to the respective blank holders, a twin drawing mold device comprises a forming force-increasing unit(30) installed on the cushion pin(19b) connected to the lower mold with higher forming force in the twin drawing mold. The forming force-increasing unit includes: the cushion pin dividingly formed by a pressure chamber(31), and a piston-attached pin(32) liftably inserted into the pressure chamber; a valve body(33) which is connected to the pressure chamber by an injection pipe(34) and a discharge pipe(35), and in which an injection chamber(36) and a discharge chamber(37) are formed; and an injecting plug installation part(38) and a discharge valve(39) installed on the injection chamber and the discharge chamber respectively to charge a pressure fluid into the pressure chamber. The pressure chamber has a coil spring(40) embedded therein. The pressure chamber has a pressure sensor(41) installed therein, and a display unit(42) is connected to the pressure sensor. The injecting plug installation part has a spring-attached check valve(43) installed thereon.
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