Thread milling is a new machining process as compared to thread tapping. As a thread making process in use for a long time, thread tapping did not have any alternative processes except the thread turning for limited cases until computer numerical control (CNC) technology had enabled the three axes synchronized motion. Therefore, investigations about the thread milling process are less as compared to other machining processes. In this work, the thread profile in the internal thread milling process was derived analytically. Experimental work was also performed to verify the performance of the analytical model. It was revealed that the thread profile produced by the cutting edge of the tool is not a straight line but a curve, and the average slope through the thread profile is less than the slope of the cutting edge of the tool. Besides, the effective thread profile enlarges along the vertical axis and constricts laterally as the ratio of thread mill diameter to thread diameter increases.

与螺纹攻丝相比，螺纹铣削是一种新的加工工艺。作为一种长期使用的螺纹加工工艺，在计算机数控（CNC）技术实现三轴同步运动之前，螺纹攻丝除了有限情况下的螺纹车削外，没有任何替代工艺。因此，与其他加工工艺相比，对螺纹铣削工艺的研究较少。在这项工作中，内螺纹铣削过程中的螺纹轮廓是分析得出的。还进行了实验工作以验证分析模型的性能。结果表明，刀具切削刃产生的螺纹牙型不是直线而是曲线，通过螺纹牙型的平均斜率小于刀具切削刃的斜率。除了，