随着技术的发展,大尺寸截形、大螺距及精密螺纹日益增多,螺纹车刀刃形近似计算方法的误差已不容忽视,需要精确计算刃形以满足生产实践中的要求。本文利用坐标变换方法,求出刀具前面与螺旋表面的交线,作为螺纹车刀刃形的精确解。 With the development of technology, the large-size truncation, large pitch and precision thread are increasing day by day. The error of the approximate calculation method of the cutting edge of the screwdriver blade can not be neglected, and the blade shape needs to be accurately calculated to meet the requirements in the production practice. In this paper, the coordinate transformation method is used to find the intersection of the front of the tool and the surface of the spiral, as the exact solution of the blade shape of the screwdriver.