The working process for cold extruding of valve-spring base has been described, with a new die structure using ejector turning of itself.
介绍了气门弹簧座的冷挤压工艺和新型模具结构。
The working process for cold extruding of valve-spring base has been described, with a new die structure using ejector turning of itself.
介绍了气门弹簧座的冷挤压工艺和新型模具结构。
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