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。
Finishing machining and rough machining for numeric control turning ellipse curve are investigated through four arc approximation method and the macro program method.
从四弧逼近法和宏程序编程方法两方面对数控车削椭圆曲线的精加工和粗加工进行了探讨。
Various numerical control programs for rough profile machining and finish profile machining are developed using macro programs. This method can be used for the contour of all types of conic.
根据粗、精加工的不同情况，举例编制了相对应的数控加工程序，此方法适用于所有二次曲线的仿形加工。
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