A STUDY ON NC-CUTTER PATH GENERATION FOR SUBDIVISION SURFACES

细分曲面数控刀具路径生成的研究

基本信息

批准号：
12555037
负责人：
SUZUKI Hiromasa
金额：
$ 7.49万
依托单位：
THE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555037/
关键词：
Subdivision Surface NC Path Generation CAM Surface Machinign 細分割工具経路生成 CAD オフセット曲面

项目摘要

In this study we proposed methodologies and algorithms of slice-cut and finish-cut tool path generation through which a 3-axis NC cutter path can be generated for subdivision surface model automatically. At the beginning, suitable subdivision scheme in order to satisfy industrial requirements, and then a process planning is determined. Next we employ a Z-map model that grid interval of x/y direction can be decided by cutting tolerance and tool parameter to set up mesh points from limit subdivision surface in order to reduce the use of computer memory and raise the computing speed. For work pieces we present a slice-cut tool path generation method with flat-end mills, we generate a cover mesh and set up a Z-map model for it, calculated their cutter contact points and cutter location points and adjust the cutter height to achieve tool paths for every slice. For finish-cut tool path generation we use ball-end mill, and achieve the path by calculating the cutter contact paths with projection points between the limit surface and the Z-map model, and then offset them to cutter location paths. Finally we implement the method and present some examples. For these two kinds of paths, we calculated curvature radius of the limit surface in order to avoid gouging. All of these cutter paths are computed automatically if there is no problem in parameter setting for the desired NC path plan, and the implementation shows that these paths are generated rapidly.

在这项研究中，我们提出了切片切割和切割刀具路径生成的方法和算法，通过该方法可以自动生成3轴NC切割器路径。一开始，为了满足工业要求，然后确定过程计划。接下来，我们采用Z-MAP模型，可以通过削减公差和工具参数来确定X/y方向的网格间隔以从极限细分表面设置网格点，以减少计算机存储器的使用并提高计算速度。对于工件，我们提出了带有扁平磨坊的切片切割工具路径生成方法，我们生成一个盖网，并为其建立Z-Map模型，计算其切割器接触点和切割机位置点，并调整切割机高度以实现每个切片的工具路径。对于完成切割工具路径的生成，我们使用球端磨机，并通过计算具有极限表面和Z-MAP模型之间的投影点的切割器接触路径来实现路径，然后将它们偏移到切割器位置路径。最后，我们实施该方法并提出了一些示例。对于这两种路径，我们计算了极限表面的曲率半径，以避免进行旋转。如果所需的NC路径计划的参数设置没有问题，则所有这些切割器路径都是自动计算的，并且实现表明这些路径是迅速生成的。