| 摘要 |
The invention relates to pressure die casting machines, and in particular to an apparatus and method for moving a die of a pressure die casting machine. According to the invention, there is provided a die casting machine having a machine base; first and second platens (10, 12) fixed to the machine base; a third platen (14) movable relative to the machine base, and positioned between the first and second said platens; at least two tie bars (22, 23), the third platen being slidably mounted on said tie bars; a protuberance (21) on each said tie bar; tie bar hydraulic cylinders (20) connected to the third platen; at least two guide bars (32) projecting through the third platen, each said guide bar having a guide bar protuberance (31); guide bar hydraulic cylinders (30) connected to the third platen, each of the cylinders (20, 30) being slidable sealingly upon respective protuberance whereby said protuberance forms a stationary piston defining first and second hydraulic chambers (25, 26, 35, 36) within the movable hydraulic cylinder; and first and second hydraulic conduit means (27, 37, 54, 55) connected respectively to the first and second hydraulic cylinder chambers for movement of the cylinder and thus of the third platen in opposite respective directions; each tie bar being fixed both to the first and second platens, each guide bar being fixed only to the first platen and not to the second platen. |
