Abstract: In order to achieve the uniform removal of grinding materials on the surfaces of screw rotor， a new type of abrasive belt grinding device was developed， which was composed of contact wheel type and free type abrasive belt grinding tools. According to the contact characteristics of grinding tool and workpiece， the contact model was established by semi analytical method and geometric approximation method respectively， and the contact stress distribution laws in the contact areas were obtained. The material removal rate prediction model was proposed based on the ThunderGBM algorithm， the contact stress and grinding process parameters were used as inputs to predict the material removal rate of the screw rotors in belt grinding. The grinding experiment was designed and implemented for the five head screw rotor. The comparisons between experimental data and numerical results show that the proposed model has high accuracy and effectiveness. 

Key words: screw rotor, belt grinding, material removal rate, ThunderGBM algorithm

摘要： 为实现螺杆转子表面磨削材料的均匀去除，开发了一种新型砂带磨削装置，该装置由接触轮式及自由式砂带磨削工具组成。针对磨削工具与工件的接触特点分别采用半解析法及几何近似法建立接触模型，获得接触区域内接触应力分布规律。提出了基于ThunderGBM算法的材料去除率预测模型，以接触应力及磨削工艺参数作为输入，对螺杆转子砂带磨削材料去除率进行了预测，然后针对五头螺杆转子设计并实施了磨削实验。实验数据与数值计算结果的对比表明提出的去除率预测模型具有较高的准确性与有效性。

关键词: 螺杆转子, 砂带磨削, 材料去除率, ThunderGBM算法