我厂一台６３０t闭式双点压力机某次单次行程工作时，冲头突然未到上死点就往下动作，幸好未造成人员伤亡。故障发生后，对机床进行了现场了解与分析。据了解，当时工作风压正常，离合器／制动器部件起动时正常，但离合器部分有铜粉状物质。离合器和制动器用于在飞轮旋转的情况 I plant a 630t closed two-point press a single trip, the punch suddenly did not go to the top dead center to move down, but fortunately did not cause casualties. After the fault occurred, carried on the scene understanding and the analysis to the machine tool. It is understood that the work was normal pressure, clutch / brake parts normal start, but the clutch part of copper powder material. Clutches and brakes are used when the flywheel is spinning