激光拼焊门内板开裂敏感因素研究

焊缝附近区域的开裂是拼焊板零件冲压成形主要质量问题之一,这种现象是由于母板变形的不均匀性导致弱板过大变形,零件结构形状、模具、冲压工艺参数的不合理都可能增加拼焊板变形不均匀的趋势.以某车型拼焊板门内板为研究对象,分析了在其冲压成形过程中可能导致开裂的因素,建立了能够真实反应成形状况的有限元模型.通过数值模拟分析了实际生产过程中可以操作的因素对成形危险区开裂的影响规律,为生产中开裂问题的处理提供了参考:在模具设计阶段应允分考虑局部特征的影响;在调模与制造阶段可以通过设置合理的凹模圆角与拉延筋获得较好的成形零件;此外,拼焊板坯料的形状及初始摆位与成形质量也密切相关.

Investigation on cracking sensitive factors of tailor welded blanks' inner door

Cracking near the welded seam is one of the major quality problems in the stamping process of tailor welded blanks (TWB). This problem is ascribed to the excessive deformation in the weaker side of the base metals which may be caused by unreasonable structure of parts and illogical parameters of stamping process. The possible factors of cracking were analyzed taking TWB inner door of some car as an example and a finite element model which could reflect the true conditions was created. The influence laws of possible factors on cracking risk area in the production were studied by numerical simulation, which could provide some references for dealing with cracking problems in the stam-ping process. The consideration for the impact of local character of the die was highly recommended in the design phase and qualified parts could be got with appropriate die radii and drawbeads in the stage of die debugging and manufacture.Also, the shape and initial position of blanks play an important part in the forming quality of TWB.