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4-8 如题图4-8所示,上模重量为30000 N,活塞下降时回油腔活塞有效面积A=60×10-4 m2,溢流阀调定压力ps=7 MPa,摩擦阻力、惯性力、管路损失忽略不计。求: (1)顺序阀的调定压力需要 MPa ? (2)上模在压缸上端且不动,换向阀在中立位置,图中压力表指示的压力是 MPa? (3)当活塞下降至上模触到工作物时,图中压力表指示压力是 MPa?
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