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中的目标CAM系统，开发了(I)适应加工顺序和刀具的操作规划模块，(Ii)用于识别加工过程中的加工形状的仿真模块，以及(Iii)实现灵活动态加工操作的实时刀具轨迹生成模块。(I)适应操作顺序和刀具的操作规划模块从原材料形状和最终加工形状的三维CAD模型中检测总的切削量。根据不同的几何考虑，将总去除量按三种方式划分为多个加工特征。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。通过参考过去的切割实例数据来确定切割条件。(Ii)加工过程中识别加工形状的仿真模块。机床…通过在工作台和刀具扫掠体积的3D实体模型之间进行连续的布尔减法，可以检测到在加工操作期间的更多的d形状。刀具扫描体积等于运动中的刀具所占据的空间。在刀具破损等刀具故障情况下，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。(Iii)实时刀具路径生成模块，实现灵活动态的加工操作，通过为该模块开发的数字仿形铣削系统实时生成刀具路径。在数字化仿形铣削系统中，将触针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触针运动。加工过程中刀具运动可以动态变化，不需要任何NC程序，由这三个模块组成的CAM系统实现了对复杂曲面的无编程加工。基于已加工形状的三维CAD模型，无需任何NC程序即可确定合适的刀具路径和加工条件，实现灵活、动态的加工操作。较少