在淬火机床上进行连续喷射淬火时,工件的加热一般是手动操作或由时间继电器控制。对于成批生产的工件,很难每次都使淬火区域控制得一样准确,特别是一个工件上要求分几段淬火时,操作就更麻烦了,也无法自动控制。如图所示花键轴要求分四段淬火,过去只能在淬火机床上作记号来手动控制,操作者需高度集中精神,但淬火区域总有误差,特别是其中两段小间隔,很难控制。采用光电继电器自动控制高频加热后就能准确地重 In the quenching machine for continuous jet quenching, the workpiece heating is usually manual operation or by the time relay control. For batch production of the workpiece, it is difficult to control the quenching area are as accurate as each time, especially when a workpiece requires quenching in several sections, the operation is even more troublesome and can not be automatically controlled. As shown in the figure, the spline shaft requires four-stage quenching. In the past, it could only be manually controlled by using a mark on the quenching machine. The operator needed to be highly focused. However, there were always errors in the quenching zone. Especially for two small intervals, it was difficult control. The use of photoelectric relay automatically control the high-frequency heating can accurately weight