CAJ | 학술논문

基于汽车车身柔性薄板零件装配建模方法，建立柔性薄板零件公差优化设计方法。根据柔性薄板零件测点装配偏差与各偏差源间的确定性模型，综合得到测点装配偏差的方差与零件制造方差和夹具定位方差之间的模型，以零件测点平均方差为公差设计函数，工序能力指数和零件制造方差比为约束函数进行零件公差优化设计，并采用车身后地板装配进行应用分析。结果表明，搭接焊接结构的零件公差设计需同步进行，对接焊接结构零件公差设计各自独立进行，而角接焊接结构的零件公差设计则先进行其中对接零件公差设计，然后进行搭接零件公差设计；搭接焊接结构中零件间刚度差异比较大时，刚度小的零件公差可以取相对更大的公差。
기우기차차신유성박판령건장배건모방법，건립유성박판령건공차우화설계방법。근거유성박판령건측점장배편차여각편차원간적학정성모형，종합득도측점장배편차적방차여령건제조방차화협구정위방차지간적모형，이령건측점평균방차위공차설계함수，공서능력지수화령건제조방차비위약속함수진행령건공차우화설계，병채용차신후지판장배진행응용분석。결과표명，탑접한접결구적령건공차설계수동보진행，대접한접결구령건공차설계각자독립진행，이각접한접결구적령건공차설계칙선진행기중대접령건공차설계，연후진행탑접령건공차설계；탑접한접결구중령건간강도차이비교대시，강도소적령건공차가이취상대경대적공차。
An optimal tolerance design method of compliant sheet metal parts was proposed based on an assembly varia-tion model of compliant sheet metal parts.The average variance model of all measurement points obtained from the de-terminate models of measurement points was adopted as the objective function of the tolerance design, and the process capacity index and the variance ratio of parts were the constraint functions.The rear floor assembly was used to validate the tolerance design method.The results showed that tolerance designs of parts were synchronously done in the lap welding structure, and independently done in the butt welding structure while in the corner welding structure the toler-ance design of the butt part was firstly done and then that of the lap part was done.When there existed a very large rig-idness difference between lap parts, the less rigidness part could adopt a bigger tolerance value.