摘要
针对轿车白车身样件开发周期长和费用高的问题,以轿车翼子板为典型零件,设计了板料数控渐进成形工作台;在数控加工中心,通过一次装夹板料实现了轿车翼子板等比例模型的预拉伸、渐进成形和切边的集成加工;利用激光扫描技术测量成形件的轮廓形状并与原始CAD模型进行对比,以改善成形件的尺寸精度;通过改变工具的成形轨迹,采用基于形状特征层切法的成形轨迹来提高零件细节部分的成形精度和表面质量.结果表明,在拉伸阶段,提高压边压力,可以有效改善成形件的减薄.
Body-in-white development is a long-time and high-cost procedure in automobile production. With the example of an automotive fender, a new hybrid incremental sheet forming workbench was devel- oped to realize the combination of pre-stretching, incremental forming and trimming by one clamping sys- tem. Surface geometry was measured by laser scanning and compared with original CAD model, and the results demonstrate that the hybrid method can improve geometric accuracy of the forming parts. The forming accuracy and surface quality of detailed features are improved by modified tool path generation method, which is based on local features. Thinning also is effectively relieved by adjusting the blank hold ing pressure at pre-stretching stage.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2013年第5期754-759,共6页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金项目(51075269)资助
关键词
翼子板
拉伸成形
渐进成形
压边力
尺寸精度
fender
stretch forming
incremental forming
blank holding pressure
geometric accuracy
