基于DFA和DFC的综合公差优化

Integrated Tolerance Optimization Based on DFC and DFA

公差是机械设计和制造过程中最重要的参数之一,其对加工成本和产品质量有很大的影响。本文采用 DFA和DFC的综合方法对制造过程中的装配精度进行分析和综合,建立了以公差为主的成本信息模型,对设计公 差和加工公差进行了系统分析,以最低制造成本为目标,根据成本 公差间的函数关系,建立了非线性的公差优化模 型,并采用遗传算法使这一问题得到了很好的解决。实例证明该方法是可行的。并为并行工程实施中其他的DFX 与DFC结合实现制造成本最低提供了良好的解决方案。

Tolerance is one of the most important parameters in design and manufacturing. It has significant impact on manufacturing cost and product quality. Analysis and synthesis of assembly tolerance is carried out based on DFA (Design for Assemble) and DFC (Design for Cost) in this paper. The cost information model is built, and design tolerance and machining tolerance are analyzed, the least-manufacturing-cost criterion and non-linear optimization model are established based on the cost-tolerance relationship. Genetic algorithm is employed to solve this problem. The example illustrated that the optimization model is correct and the solution is reliable. The research provided an effective scheme for combining DFX and DFC to achieve the least manufacturing cost in concurrent engineering.