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.
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.
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