How does the thread-cutter configuration with respect to the workpiece axis in roughing affect the shape precision of the external trapezoidal thread and the margin in final grinding? That question is investigated in the present work. An algorithm is outlined for determining the transverse profile of the helical channel in the external trapezoidal thread at the inner, central, and outer diameters. The channel profile calculated from that algorithm determines the cutting-edge profile at the front surface of a cutter positioned perpendicularly to the part’s helical surface for preliminary machining.

中文翻译：

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梯形螺纹导向螺钉的更精确成型

粗加工时螺纹刀具相对于工件轴线的配置如何影响外梯形螺纹的形状精度和精磨时的余量？在目前的工作中研究了这个问题。概述了一种算法，用于确定外梯形螺纹在内径、中心径和外径处的螺旋通道的横向轮廓。根据该算法计算出的通道轮廓确定刀具前表面的切削刃轮廓，该刀具前表面垂直于零件的螺旋表面以进行初步加工。