板材多点渐进成形的破裂预测模型的建立

Establishment of Fracture Prediction Model of Muti-point Incremental Forming on Sheet Material

针对方金属板材在成形过程中易破裂问题,以方锥台为试验制件,设计响应曲面试验方案,对多点渐进成形过程进行数值模拟,借助Design-Expert,将成形工具头直径、进给量、成形角、板厚作为分析因子,厚度减薄率φ与成形深度h作为响应因子,建立多元回归破裂预测模型,对预测模型得到的最优与最差工艺参数进行数值模拟与试验,并对得到的结果进行对比分析。结果表明:预测结果、数值模拟结果、试验结果在数值上非常接近,以方锥台为对象构建的破裂预测模型,可用于金属板材破裂的预测,提高金属制件成形质量。

Aiming at the problem that square sheet metal is easy to be fracturedexisted in the forming process,we put forward an experimental method of response surface,which uses square cone as experimental material,to simulate the multi-point incremental forming.A multivariate regression fracture prediction model is established,regarding tool diameter,feed,forming angle,sheet thickness as influential factors and thickness reduction ratio(φ),depth of forming(h) as response factors based on Design-Expert software.A comparison of the calculated results with the test results which use the the optimal and worst process parameters obtained from the prediction model indicates that the prediction results,numerical simulation results and test results are very close to each other.The fracture prediction model constructed by square cone can be used to predict the fracture of sheet metal and improve the forming quality of metal parts.