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絲錐攻半絲,,請(qǐng)教 |
點(diǎn)評(píng)
剖開(kāi)過(guò)幾個(gè)工件,,在螺紋處未發(fā)現(xiàn)縮松等缺陷,有的在離較遠(yuǎn)區(qū)域有縮松,。請(qǐng)問(wèn)這算是材料不均的直接證據(jù)嗎,?鑄件是我們廠自己鑄造的他們是核心我們不好翻案啊。也不算太嚴(yán)重,,偶爾出現(xiàn)幾次,。
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