以线性加减速为例研究了螺纹过渡起始位置的确定方法; 根据螺纹切削的基本原理，分析了通过重新计算加速度或螺距增量来确保过渡时间和过渡长度固定不变的方法; 在此基础上，提出了一种多段连续螺纹平滑过渡的插补方法．仿真与加工实验表明，利用文中方法进行不同螺距或不同锥度多段连续螺纹切削时，加工轨迹没有明显的凸起和变化，可实现两段螺纹的平滑过渡，从而证明了该方法的准确性、稳定性和可重复性．

In this paper,first,a method to determine the initial position of smooth transition of thread is discussed by taking the linear acceleration /deceleration as an example. Then,according to the basic principle of thread cutting,an improved method of re-calculating the acceleration or the pitch increment is analyzed to ensure fixed transition time and length. Thus,an interpolation method for the smooth transition of multi-sect continuous thread is proposed. Simulation and processing results show that,when the proposed method is applied to the cutting of multisect continuous thread with different pitches or tapers,no significant embossment and change of the processing track is observed,and the smooth transition of a two-sect thread is successfully achieved,which means that the proposed method is of high accuracy,stability and repeatability.