兼顾鲁棒性的多目标焊点自适应优化方法

电阻点焊是白车身制造过程中主要的装配工艺手段,其数量和布置会对白车身动刚度和静刚度产生很大的影响,但这两种影响并不总是一致的。因此,在以同时提升动/静刚度为目标的焊点优化中,需要一种能够兼顾动刚度和静刚度的指标,同时还要确保生产中的工业鲁棒性,使焊点设计方案实施效果不会轻易受到焊点制造缺陷的影响。本文中提出了一种以焊点及相邻单元应变能为基础,兼顾动刚度性能和静刚度性能的焊点优化决策指标,并利用该指标,构建了高效的鲁棒性分析方案,从而形成了一种多目标的焊点自适应优化方法,能实现同时考虑多种性能指标和鲁棒性的焊点优化过程。该方法被应用于某款轻型客车白车身焊点的性能优化和鲁棒性分析,并通过试验验证了其有效性。

Multi-object Adaptive Optimization of Spot Welds with Consideration of Robustness

Resistance spot welding is the main assembly process in body-in-white manufacturing.The number and layout of spot welds may have great effects on the dynamic and static stiffness of body-in-white,but these two effects are not always in the same direction.Therefore,in the optimization with concurrently improving both dynamic and static stiffness as the objective,an indicator,which can take into account both dynamic and static stiffness,is required,while ensuring the industrial robustness in production.In this paper,a decision-making indicator for spot weld optimization with consideration of both dynamic and static stiffness is proposed based on the strain energy of spot welds and adjacent elements.The indicator is then used to construct an efficient robustness analysis scheme,thus forming a multi-objective adaptive optimization method for spot-welds,enabling the realization of a spot-weld optimization process,with concurrent consideration of multiple performance indicators and robustness.Finally,the method is applied to the performance optimization and robustness analysis of the spot welds in the body-in-white of a light bus,with its effectiveness verified by tests.