Patent ID: 6923243
Filing Date: 2005-08-02
Classification: B22D

Abstract:
1. An electromagnetically driven die casting decompression valve, used for decompression of the inside of a cavity injection filled with molten metal in order to obtain a desired cast item, and fitted in an exhaust passage formed communicating with a cavity inside a mold, comprising: a drive shaft, provided inside a drive block, driven by electromagnetic force from a solenoid; and a valve shaft, provided inside a valve block separate from the drive shaft, provided with a valve body on one shaft end, wherein a closing spring working jointly to urge the valve body in a closing direction is provided on the valve shaft, while an opening spring working jointly to urge the valve body in the opening direction is provided on the drive shaft, a shaft end surface of the drive shaft and shaft end surface of the valve shaft that is opposite to a valve mounting side are brought into contact by urging forces in opposite axial directions exerted by the closing spring and the opening spring, opening and closing of the decompression valve is carried out by driving the valve shaft connected to the drive shaft driven by the solenoid, and it is possible to replace the valve block.