一般组合机床及其自动线,由于它们是专用设备,是一次性生产,从它们投入生产开始到报废为止,其运行过程大致经历三个时期:即早期故障期、偶然故障期和耗损故障期。早期故障期的特点是在自动线出厂前试切削与在用户厂刚投入使用时,由于自动线结构本身和外购件存在某些技术问题、 General assembly machine tools and their automatic line, because they are special equipment, is a one-time production, from their production began to scrap up, the operation has gone through about three periods: the early failure period, accidental failure period and wear failure period. The characteristics of the early failure period is that the automatic cutting of the factory before the trial cutting and the user plant just put into use, due to the automatic line structure itself and purchased parts there are some technical problems,