我厂生产的自吸式离心油泵的铝合金壳体(材料 ZL104)如图37所示(图中只标出了有关尺寸)。在试制时,因属单件加工,我们用 T618镗床进行加工孔系尺寸。但在批量生产中,T618镗床加工虽能保证加工精度,但辅助时间长,效率低。也曾利用通用动力头和镗模联接进行批量生产,因动力头转速太低(般最高转速只有400～500转/分),导致切削线速度太小,使加工精度无法保证。如果在动力头和镗模之间加一增速机构来 I plant production of self-priming centrifugal pump aluminum alloy casing (material ZL104) as shown in Figure 37 (Figure shows only the size). In the trial production, because it is a single piece processing, we use T618 boring machine processing hole size. However, in mass production, T618 boring machine processing to ensure the accuracy of processing, but aided a long time, low efficiency. Have also used the universal power head and boring die for mass production, because the power head speed is too low (usually the maximum speed of only 400 ~ 500 rev / min), resulting in cutting speed is too small, so processing accuracy can not be guaranteed. If the power head and boring mode plus a speed mechanism