天津精密机械加工是通过机器改变工件尺寸或性能的过程。根据工件的温度状态，将其分为冷加工、热加工。通常在常温下进行机械加工且不会引起工件化学变化的称为冷加工。一般来说，高于或低于正常温度的过程会引起工件化学变化的机械加工称为热加工。

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