But because of their poor rigidity, it is easy to bring machining deformation caused by the existence of the residual stress and the fixing stress.

残余应力及装夹应力容易使刚性差的薄壁件引起较大的加工变形，而传统工艺难以使其达到精度要求。

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The machining process of copper reflector is described. A processing method of "simultaneous processing of two sides and natural stress releasing" is put forth.

叙述铜反射镜的加工过程，提出“两面同时加工，自然释放应力”的加工方法。

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Experiment results showed that the fracture of the nut was originated from a variety of macro defects, micro defects both by founding and machining, as well as high residual stress.

结果表明，螺母存在多种铸造及加工的宏观、微观观察缺陷和残余应力过高是螺母断裂失效的原因。

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