弹簧座论文弹簧座冲压成形数值模拟及工艺优化.docVIP

弹簧座论文：弹簧座冲压成形数值模拟及工艺优化 【中文摘要】弹簧座由于其螺旋面带来的非对称性,使其冲压成形过程中的受力变形状态要比一般的对称件复杂得多。按照工厂原有工艺流程进行生产时,其拉深工件在凸台侧壁等质量关键部位厚度分布极不均匀,增厚、变薄都相当严重而达不到产品质量要求；翻边工件局部有破裂的趋势；翻孔工件极易在U形缺口处产生裂纹,产品质量难以控制。为克服弹簧座的成形缺陷及探明成形特点,本文利用数值模拟技术,建立了零件拉深、翻边等整个成形过程数值模型,以特征点的形式呈现出了拉深工件质量关键部位的变形特点,并通过多工步模拟反应出了厚度、应变状态等信息在工序间的传递情况。工序间的应变及厚度变化信息表明,后一工序基本上不影响前一工序所确定的成形质量,可以通过调整单一工序逐个改善各缺陷部位的质量来提高总体质量。针对拉深工件的质量问题,在模拟试验基础上以凸台部位的凸模圆角半径和模具间隙为影响因素建立了拉深工件质量关键部位材料的最大减薄率和最大增厚率的回归分析模型。根据两回归分析模型对工件质量进行了多目标优化,得出了质量评价模型,拟出了可生产出合格工件的最佳工艺参数。针对翻边工件质量状况进行了工艺参数可行性分析,分别得出了对模具间隙、凹模圆角半径或凸模圆角半径进行单一调整即可达到工件质量要求的工艺参数。针对翻孔过程中U形缺口边缘出现的破裂现象,在数值模拟的基础上运用正交试验对合理工艺参数展开了寻找。由试验结果表明,限于零件缺口的位置要求,很难以调整工艺参数的方式来完全克服产品的破裂缺陷,需要调整工序内容来改善零件的成形质量。通过调整冲孔、翻孔等工序内容后,产品的质量得到了保证。 【英文摘要】Because of its spiral surface which causes asymmetry, the deformation state of spring seat in the stamping process is much more complicated than that of general symmetry part. Accordance with the original production process,as the thickness distribution of drawing workpiece is extremely uneven in key positions, boss,thickening and thinning are too serious to meet the quality requirements of product;workpiece of flanging has risk of crack;in the hole flanging operation,cracks extremely easily occur on the edge of U-notch,which make the quality of product too difficult to control.In order to overcome the defects and ascertain the forming characteristics of the spring seat, using numerical simulation technology, this paper establishes all of the numerical simulation models of the forming process which include drawing,flanging, and hole flanging.The deformation characteristics of drawing workpiece in the key positions are presented by several feature points.Through the multi-step simulation in this paper, the transfer about thickness, strain and other information are well reflected.The information of thickness and strain in diferent operations show that the forming quality which evaluationed by the previous operation does not suffer the influence of the next one. Therefore, the ove