| 摘要 |
<p>In a die cushion pin pressure equalizing system wherein a plurality of die cushion pins are provided in the bolster of a press machine, pressure equalizing hydraulic cylinders supported by die cushions are respectively provided downwardly of the plurality of die cushions and the plurality of pressure equalizing hydraulic cylinders are connected to one another, so that a predetermined oil pressure is sealed therebetween, a total amount of oil sealed in the die cushion pin pressure equalizing system is increased to thereby easily prevent stopper portions of plungers of unused pressure equalizing hydraulic cylinders from filing, cracking, breaking and oil leaking.</p> |
