【作者】 曹衍龙；

【导师】 吴昭同； 杨将新；

【作者基本信息】 浙江大学 ， 机械制造及其自动化， 2003， 博士

【摘要】 本文在分析国内外计算机辅助公差设计技术的发展历史和研究现状的基础上，结合国家自然科学基金项目“设计和制造(工序)公差并行优化设计的研究”(59575076)、“综合公差计算机辅助设计系统的研究”(59705022)、“基于产品几何技术规范的集成公差设计理论与方法”(50275136)以及浙江省自然科学基金项目“基于稳健性和全过程成本的公差设计系统(500115)”和“面向CAPP的工序公差设计研究(502016)”，系统地研究了面向制造的公差稳健设计方法与实现技术。 第一章 论述了计算机辅助公差设计的发展历史和研究现状，综述了国内外稳健设计方法及其应用于公差设计的研究与进展，讨论了本课题的研究背景和意义，给出了本论文的主要研究内容、总体框架及创新点。 第二章 研究了公差稳健设计中所涉及到的成本模型。首先研究了面向制造环境的公差-成本模型，对加工因素进行模糊化处理，建立了加工因素的模糊影响系数，并以此系数和零件公差作为输入，建立了基于模糊神经网络的公差-成本模型。然后应用模糊理论对田口二次型质量损失模型进行拓展，提出了模糊质量损失和模糊质量损失成本的概念，由此建立了模糊质量损失模型，并研究了多质量特性时模糊质量损失成本的计算方法。 第三章 研究了基于模糊质量损失的公差稳健设计理论与方法。首先给出了公差稳健设计的模糊稳健性指标及模糊稳健设计准则，分析了应用模糊质量损失模型进行公差稳健设计的一般形式和模型，并应用实例进行了验证；研究了基于试验设计方法(田口正交试验法和响应面法等)的公差稳健设计，最后对常用试验设计方法进行了对比研究。 第四章 系统研究了公差可行稳健性和敏感稳健设计与评价方法。在分析可行稳健性和敏感稳健性的含义基础上，建立了公差可行稳健性、敏感稳健性设计和可行敏感稳健设计的数学模型及相应的设计方法，讨论了公差设计可行稳健性和敏感稳健性的评价方法；并用实例进行了验证。 第五章 根据面向制造设计的思想，提出了面向制造的公差稳健设计方法，建立了基于工序能力的公差稳健设计模型，使得在公差设计中能考虑具体制造环境的约束，在获得最优稳健公差的同时选择经济合理的加工方法，保证了公差设计结果的可制造性和稳健性。 第六章 在MDT6.0下应用C++和PB等工具开发了面向制造资源的公差稳健设计原型系统，并用实例验证了前几章所提出的理论与方法。 第七章 概括了本文的主要研究内容，对计算机辅助公差设计应该进一步开展的工作进行了探讨浙江大学博士学位论文:面向制造环境的公差稳健设计方法与技术的研究与展望。更多还原

【Abstract】 On the basis of comprehensive analysis for recent research status of computer-aided Tolerancing both in and out of China, binding State Natural Science Foundation of China ("Study on Simultaneous Design of Blueprint Tolerance and Process Tolerance", No.59575076 -, "Study on Computer Aided Tolerancing System" No.59705022 and "Design theory of integration Tolerance based on Geometrical Product Specifications" No. 50275136) and State Natural Science Foundation of Zhejiang ("Study on Tolerance Design System Based on Robustness and Life Circle Cost" No.500115 and "Study on Process Tolerance design for CAPP" No.502016), the methodology and technology of robust tolerance design for manufacture is studied.In chapter 1, the important role of computer-aided Tolerancing in modern manufacture and research status on key theories and technologies of the region are summarized. The main contents, general structure scheme and innovation points of this dissertation are given.In chapter 2, the total cost model involved in tolerance design is studied. Firstly, a new cost-tolerance model, which closely links with real technological process, is built using fuzzy neural networks. The influence of process factor on the manufacturing cost is analysed and a fuzzy process factor is introduced using fuzzy mathematics principle. Then fuzzy neural network is applied to modelling of production cost-tolerance model. The inputs of the network are tolerance and fuzzy process factor and the output is manufacturing cost. Secondly, Taguchi’s quality loss function is a simple quadratic symmetric style, the paper expands it a fuzzy quality loss model using fuzzy theory. A concept of fuzzy quality loss and fuzzy quality loss cost are first presented. Then a fuzzy quality loss model is put forward and a multiple characteristics’ fuzzy quality evaluation method is given.In chapter 3, a robust tolerance design method is put forward according to fuzzy quality loss model. Firstly, the design model with fuzzy quality loss model is presented. Then tolerance design method utilizing two main kinds of DOE, i.e. Taguchi’s method and response surface method, are given. The comparison and analysis between these methods is made at last.In chapter 4, design and evaluation method of feasible robustness and sensitive robustness in tolerancing is studied. Firstly, the concept of feasible robustness and sensitive robustness is given. Then the tolerance feasible robust design model and tolerance sensitive robust model are put forward. The optimisation methods are introduced to solve these models and some examples are given to verity the proposed method. The evaluation method is given at last.In chapter 5, with DFM (Design for manufacture) ideas, a framework of integrated system of robust tolerance design for manufacturing is established. A method for robust tolerance design in terms of Process Capability Indices (PCI) is presented. The component tolerance and the suitable manufacturing processescan be selected based on the real manufacturing context.In chapter 6, robust tolerance design for manufacture based on product data management system was build on MDT. Some examples are studied to demonstrate the proposed theory and method.In chapter 7, the important results and conclusions of the dissertation are summarized and the future research of compute-aided tolerancing and robust design is prospected.更多还原