Development of CAM system installed in CNC controller to achieve flexible and dynamic machining operations

开发安装在 CNC 控制器中的 CAM 系统，实现灵活动态的加工操作

• 批准号: 13650278
• 负责人: SHIRASE Keiichi
• 金额: $ 2.18万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650278/
• 关键词: NC machine tool; Autonomous machining; Intelligent NC machine tool; Operation planning; CAM; Machining feature; Machining shape simulator; End milling operation; 知能型・自立型NC工作機械; 加工形状シュミレータ

For the target CAM system installed in CNC controller, (i) The operation planning module to adapt operation sequence and cutting tools, (ii) The simulation module to recognize machined shape during machining operation, and (iii) The real time tool path generation module to achieve flexible and dynamic machining operations, are developed in this study.(i) The operation planning module to adapt operation sequence and cutting toolsThe total removal volume is detected from 3D CAD models of a raw material shape and a final machined shape. The total removal volume is divided into several machining features in three ways for different geometrical consideration. The operation sequence is derived from the geometrical relations among the machining features. The cutting tool is selected according to the machining feature detected. The cutting conditions are determined by referring the past cutting case data.(ii) The simulation module to recognize machined shape during machining operationA machine … More d shape during machining operation can be detected by successive Boolean subtractions between 3D solid models of a workpice and a tool swept volume. The tool swept volume equals the space occupied by the cutting tool in motion. In case of cutting trouble such as tool breakage, the machined shape during machining operation is available to use as a raw material shape for a new operation planning.(iii) The real time tool path generation module to realize flexible and dynamic machining operationTool paths can be generated in real time by the digital copy milling system which is developed for this module. In the digital copy milling system, a stylus and a master model are defined as geometrical surface models of 3D CAD, the stylus motion corresponding to the tool motion is generated based on copy milling principle. The tool motion can be changed dynamically during machining operation without any NC program.NC programless milling of sculptured surface has been achieved by the CAM system which consists of those three modules. Based on a 3D CAD model of machined shape, suitable tool paths and cutting conditions can be determined without any NC program to achieve flexible and dynamic machining operation. Less

针对安装在数控控制器上的目标凸轮系统，开发了加工计划模块，以适应加工顺序和刀具，仿真模块，以识别加工过程中的加工形状，实时刀路生成模块，以实现灵活动态的加工操作。(i)操作计划模块，以适应操作顺序和刀具。从原材料形状和最终加工形状的3D CAD模型中检测总去除量。根据不同的几何考虑，以三种方式将总去除量划分为几个加工特征。根据加工特征之间的几何关系推导出加工顺序。根据检测到的加工特征选择刀具。切削条件是通过参考过去的切削案例数据来确定的。（ii）加工过程中被加工形状识别的仿真模块。通过工件三维实体模型与刀具扫描体积之间的连续布尔减法，可以检测加工过程中更多的形状。刀具扫掠体积等于刀具在运动中所占的空间。当发生刀具断裂等切削故障时，加工过程中的加工形状可作为新的加工计划的原材料形状。（三）实时刀路生成模块，实现灵活、动态的加工操作。针对该模块开发的数字仿形铣削系统可实时生成刀路。在数字仿形铣削系统中，将手写笔和主模型定义为三维CAD的几何曲面模型，根据仿形铣削原理生成与刀具运动相对应的手写笔运动。刀具运动在加工过程中可以动态改变，无需任何数控程序。由这三个模块组成的凸轮系统实现了对已成形曲面的数控无程序铣削。基于被加工形状的三维CAD模型，无需任何数控程序即可确定合适的刀具路径和切削条件，实现灵活动态的加工操作。少