摘要
为了实现复杂型材零件的高效和精密制造,提出一种变曲率轮廓、变截面型材零件工艺模型设计方法。以去下陷结构的零件设计模型为初始工艺模型,选择该模型外型面一条轮廓线进行等距离散和等曲率拟合;采用数值模拟获取工艺模型回弹后的轮廓线数据,通过集成接口读取数据,以确定各等曲率段回弹后的半径;将回弹前后圆弧半径差值作为补偿量,基于各段一阶连续方法拟合得到补偿后轮廓线;将初始工艺模型轮廓线各等距离散点法向截面线平移到补偿后所在点位置,采用多截面曲面重构工艺模型参考面;最后按设计模型添加下陷结构形成最终工艺模型。应用上述方法基于CATIA开发了型材零件工艺模型设计工具,实验验证结果分析表明,该方法可以实现复杂型材零件工艺模型的快速、精确设计,显著提高了以此为基础的型材零件"一步法"成形后的外形精度,大大减少了校形工作量。
To realize high effective and precise manufacturing of complex profile parts, a design method for processing model with variable curvature contour and variable section profile part was proposed. The design model without joggle was set as the initial model to select one contour curve of the profile shape to discrete equidistantly and fit with several arcs. Numerical simulation was used to calculate springback data of the contour curve To determine arcs of the contour curve after spring- hack, an integrated interface was established to read the simulation result of the springhack data. The arc radius difference was used to compensate the springhack, and the first-order continuous compensated contour curve was fitted with the arcs after compensation. The normal section-curves which laid on the isometric discrete points of the initial model contour curve was translated to the corresponding points after compensation, and the reference surface of the model for processing was re- constructed with multi-section surface Joggle structure was added to create final processing model based on the design mod- el. The design tool of profile part model for processing was developed based on CATIA by the method mentioned above The analysis of test results showed that the complex profile part model for processing could be built fast and accurately, the forming accuracy was improved significantly after ＂one-step＂ forming based on the model, and the manual shape correction work was reduced greatly.
出处
《计算机集成制造系统》
EI
CSCD
北大核心
2014年第4期755-761,共7页
Computer Integrated Manufacturing Systems
基金
国家自然科学基金资助项目(51275420)~~
关键词
模型设计
几何离散
回弹预测
回弹补偿
型材零件
工艺模型
model design
discrete geometry
springback prediction
springback compensation
profile part
process-ing model
