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我厂锻工车间从1974年自制电热镦机进行气门电热镦以来,其夹头一直采用紫铜制造,但由于紫铜红硬性差,因此夹头寿命较短。特别是夹
Our workshop forging workshop since 1974 homemade electric upsetting machine for electric valve upsetting, the collet has been used in the manufacture of copper, but because of poor red copper red hardness, the chuck life is shorter. Especially the clip