穿孔：在保持架部门的第四步工序。同时按要求在切出保持架兜孔，维持合适的尺寸。
PERFORATOR: Fourth stage of operation in the cage department. Simultaneously cuts out all pockets required in blank, maintaining proper top dimensions.
方形兜孔钢保持架因为钢架硬度高、拉削难度大等特点，始终采用线切割加工方兜孔。
The working for square pockets of turning steel cages having high hardness and difficult to broach is conducted in linear cutting.
在一般绘图仪上绘制出了斜兜孔保持架模具总图和主要零件图。
On general plotter, the assembly drawing and main parts drawings of die for bearing cage with slanting hole are made.
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