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機(jī)器發(fā)生故障后，其經(jīng)濟(jì)技術(shù)指標(biāo)部分或全部下降而達(dá)不到預(yù)定要求，如功率下降、精度降低、加工表面粗糙度達(dá)不到預(yù)定等級(jí)或發(fā)生強(qiáng)烈振動(dòng)、出現(xiàn)不正常的聲響等。機(jī)電設(shè)備的故障分為自然故障和事故性故障兩類(lèi)。自然故障是指機(jī)器各部分零件的正常磨損或物理、化學(xué)變化造成零件的變形、斷裂、蝕損等，使機(jī)器零件失效所引起的故障。事故性故障是指因維護(hù)和調(diào)整不當(dāng)，違反操作規(guī)程或使用了質(zhì)量不合格的零件和材料等造成的故障，這種故障是人為造成的，可以避免。

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