由于直至钻这些小孔时，工件都对称于大孔轴线，所以没必要控制围绕大孔轴线回转的位置。
There is no need to control the rotational position about the axis of the bore, because up to the time when the holes are drilled, it is symmetrical about that axis.
散热器加水口盖壳缩径模设计难点是对称凸耳成形及内弯后脱取工件困难。
The difficulty in designing the necking die for water_adding entry lid shell of radiator was the stripping of the part after the forming and in_bending of symmetrical protruding ear.
对称型槽成形的工件较平直。
The workpiece formed by the symmetrical trough is relatively straight.
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