一维多工序制造过程全局成功率建模与公差稳健设计

Overall Yield Modeling and Tolerance Robust Design for One-Dimensional Multi-station Manufacturing Process

文章开展一维多工序制造过程全局成功率建模与公差稳健设计.首先,根据加工余量落在公差允许范围内的概率,建立了零件加工成功率计算模型,根据装配尺寸链中封闭环尺寸落在公差允许范围内的概率,建立一维多工序装配成功率计算模型;根据加工成功率和装配成功率是相互独立的假设,建立一维多工序全局成功率模型;然后,构建以产品全局成功率的敏感度最小化为目标的一维多工序制造过程公差稳健设计优化模型;最后,以组件轴向装配为例,建立公差稳健设计优化模型并对该模型进行优化设计,结果表明该方法的有效性.这为产品一维多工序制造装配质量保障提供了一种新的途径.

Overall yield modeling and tolerance robust design of one-dimensional multi-station manufacturing process were developed. Firstly,according to the probability that the machining allowance falls within the allowable tolerance range,the machining success rate model of parts was established;according to the probability that the closed ring size in the assembly dimension chain falls within the allowable tolerance range,the one-dimensional multi-station assembly success rate calculation model was established;according to the assumption that the machining success rate and assembly success rate were independent,overall yield calculation modeling for one-dimensional multi-station manufacturing process was established. Then,the tolerance robust design optimization model of one-dimensional multi-station manufacturing process with the objective of minimizing the sensitivity of overall yield of the product was constructed;finally,the tolerance robust design optimization model was established and optimized by taking the axial assembly of components as an example. The result shows that the method is effective,which provides a new way for product one-dimensional multi process manufacturing assembly quality assurance.