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对目前常用的无瞬心包络法螺杆加工数控程序中产生误差的原因进行了分析研究，提出了一种校验数控程序精度的分析方法，为改进数控程序提供了理论依据。
This paper analyzes the causes of the error in the NC program of screw machining without instant center envelope method and proposes a method to check the accuracy of NC program and provides a theoretical basis for the improvement of NC program.