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近年来,对线切割机床贮丝筒轴及电机轴的扭断,许多同志提出过解决办法,如采用新型的缓冲材料、在轴的加工中,应力集中处留园角过渡等。现也谈一点体会。贮丝筒一般在10～20秒就要换向一次,频繁的换向,很容易造成轴的疲劳损伤。久而久之,损伤处的轴径越来越细,最终断裂。有的单位在联轴器上加有缓冲材料,但在换向时巨大的扭力作用下,很快就会损坏,这时,电机换向扭力就会直接作用于轴上,加快了断轴的产生。笔者体会,解决断轴的根本途径在于减小换向时的扭力。
In recent years, wire cutting machine wire cylinder shaft and motor shaft twist, many comrades proposed solutions, such as the use of a new type of cushioning material in the shaft processing, the stress concentration at the corner stay corner transition. Now also talk about experience. Cartridge generally 10 to 20 seconds to be commutated once, frequent commutation, it is easy to cause fatigue shaft damage. As time passes, the lesion at the shaft diameter more and more fine, the final fracture. Some units in the coupling with cushioning material, but when the commutation huge torque effect, will soon be damaged, then the motor commutation torque will act directly on the shaft, speed up the broken shaft . The author understands that the fundamental way to solve the broken shaft lies in reducing the torque when commutating.