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在工业学大庆运动中,我车间于1972年设计制造一台简易的阀套镗孔机,加工400公斤空气锤上下阀套φ130D_4孔(光洁度??6),代替了一台C630普通车床.
In the Daqing Industrial Movement, my workshop designed and manufactured a simple valve sleeve boring machine in 1972, processing φ130D_4 holes (finish 6) of the upper and lower air valve sleeves of 400 kg air hammer, instead of a C630 ordinary lathe.