目前国内生产的超厚加工数控切割机床如北京电加工机床厂生产的DK7725A数控线切割机床,钼丝通过导轮、压丝轮等部件周折较多(如图1),导轮、压丝轮等部件所承受的压力大,磨损快,钼丝使用寿命较短。此外,换向时易断钻丝,影响加工工件精度。在实际操作中,根据加工工件具体情况,如 At present, the domestic production of ultra-thick CNC cutting machine tools such as Beijing Electric Machine Tool Factory production DK7725A CNC WEDM machine, molybdenum wire through the guide wheel, pressing wheel and other components more twists and turns (Figure 1), guide wheel, And other parts of the pressure, wear fast, molybdenum wire shorter life. In addition, the commutation easily broken drill wire, affecting the accuracy of the workpiece. In practice, according to the specific circumstances of the workpiece, such as