摘要
针对数控渐进成形中鼓包的问题,提出了基于STL(Sterolithography)模型的等高线轮廓扫描、等高线轮廓与底面扫描、各等高层由外向内全扫描和各等高层由内向外全扫描4种挤压工具扫描运动轨迹类型,并给出了基于STL模型顶点偏置算法和多边形边偏置算法的各类型挤压运动轨迹生成方法;同时,采用有限元分析软件对这4种扫描运动轨迹的数控渐进成形效果进行了数字模拟仿真分析。研究结果表明,采用各等高层由内向外全扫描的轨迹进行数控渐进成形时不发生鼓包现象,并且能够减少制件的整体厚度差。
For the bump phenomenon in the NC incremental forming, four kinds of scanning paths for extrusion tool such as the contour outline scanning path, the contour outline and underside scanning path, the full scanning path from outside to inside by each contour lay- er, and the full scanning path from inside to outside by each contour layer were put forward based on STL （Sterolithography） , and each type of path generation algorithm based on the algorithm of STL model vertex offset and polygon edge offset was given. At the same time, the NC incremental forming effects of the above four scanning paths were simulated by finite element analysis software. The results show that during the CNC incremental forming the bulge phenomenon does not occur by the full scanning path from inside to outside on each contour layer, and the thickness differences in the whole decrease.
出处
《锻压技术》
CAS
CSCD
北大核心
2015年第5期15-21,共7页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51175351)
关键词
板材成形
数控渐进成形
成形轨迹
sheet metal forming
NC incremental forming
forming path
