3101| 17
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方鋼鋼管上形成螺孔 |
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點(diǎn)評(píng)
你是說(shuō)大師級(jí)的不應(yīng)該不懂,是吧?
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點(diǎn)評(píng)
可以考慮沖壓工藝-刺破翻孔。然后攻牙。不過(guò)需要壓機(jī)和做個(gè)小模具
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評(píng)分
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