Study on smint NC processor which includes milling process model for process prediction to buill the next generation of machine tools

1. 为了预测加工过程中材料形状的变化，开发了基于体素模型的加工形状模拟器。通过在体素模型中引入Oct-tree结构来精确地表示材料形状，可以减少体素的总量（计算机的内存使用量），从而实现实际的加工形状仿真。此外。利用体素模型的特点，可以成功地实现五轴控制加工的加工形状仿真。为了预测铣削加工过程中切削力的变化，开发了一种用于铣削加工的切削力模拟器。对方立铣刀和球立铣刀在几种切削条件下的切削力进行了预测，结果与实测结果吻合较好。此外，还进行了虚拟加工仿真，分析了铣削过程中材料形状和切削力的变化规律。achieved.3。为了有效地利用五轴机床的性能，开发了一种辅助五轴机床确定合适刀具姿态的工艺规划支撑系统。设计了工艺规划支持系统，通过对材料和刀具形状进行体素模型表达，实现碰撞检查和刀具轨迹的快速生成。验证了该方法可以有效地确定五轴机床的合适刀姿。为实现智能数控加工机床的柔性操作，开发了一种能够根据观察到的机床情况动态改变加工作业计划的反应调度系统。通过计算实验验证了加工作业计划能根据加工时间的变化和差异灵活更新。少

1. Machining shape simulator based on Voxel modelIn order to predict the change of material shape during machining operation, a machining shape simulator based on the Voxel model was developed. By introducing the Oct-tree structure into the Voxel model to represent a material shape precisely, the total amount of the Voxel (memory usage of the computer) can be reduced to realize a practical machining shape simulation. Moreover. the machining shape simulation of five-axis controlled machining can be achieved successfully utilizing the feature of the Voxel model.2. Cutting force simulator of endmilling operationIn order to predict the change of cutting force during machining operation, a cutting force simulator for endmilling operation was developed. It was verified that the predicted cutting forces in several cutting conditions have good agreement with the measured one for both the square end mill and the ball end mill. In addition, a virtual machining simulation, which shows the change … More of material shape and cutting force during milling operation. was achieved.3. Process planning support system for 5-axis machine toolIn order to utilize the performance of 5-axis machine tools effectively a process planning support system, which assists to determine the suitable tool posture for 5-axis machine tools, was developed. The process planning support system is designed to perform the collision check and the tool path generation quickly by applying Voxel model expression of the material and the tooling shapes. It is verified that the suitable tool posture for 5-axis machine tools can be determined effectively.4. Reactive scheduling utilizing for autonomous machine toolIn order to achieve flexible operation of the autonomous machine tool with a smart NC processor, a reactive scheduling system which is able to change the machining operation schedule dynamically according to the observed situation of machine tools was developed. It was confirmed that the machining operation schedule was flexibly updated to the change and the difference of operation times by the computational experiment. Less