3374| 17
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方鋼鋼管上形成螺孔 |
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點(diǎn)評
你是說大師級的不應(yīng)該不懂,是吧?
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點(diǎn)評
可以考慮沖壓工藝-刺破翻孔。然后攻牙。不過需要壓機(jī)和做個小模具
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評分
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