集成制造工艺的可重构机床配置与优化方法研究

发布时间：2019-01-05 14:34

【摘要】：可重构机床(Reconfigurable Machine Tools,RMT)是一种符合制造业未来发展趋势的新型机床。目前国内外大多研究者都将RMT结构配置和制造工艺优化看作两个相对独立的研究内容,然而二者间存在着不可忽视的联系。制造工艺与RMT配置的协同优化,有利于获得低投入高产出的制造系统。因此,本课题对集成制造工艺的RMT配置优化问题展开研究,以获得可行的解决方法。(1)在分析RMT特性的基础上,阐述了集成制造工艺的RMT配置优化问题的研究思想,构建了问题的四层研究体系结构,系统地分析了研究过程中涉及的关键问题,确定了解决相关问题的技术路线。(2)分析零件加工特征的类型,对加工特征成型方式进行了形式化描述,在此基础上定义了特征加工单元,并建立零件特征加工工艺信息模型,构建特征加工单元间的工艺约束;进一步对零件工艺路线规划问题进行建模,设计遗传算法实现了问题的求解,辅以实例验证了方法的可行性。(3)依据功能结构将RMT机械系统划分为子模块,再根据子模块间的关联特性构建功能部件群,并利用多色集合理论建立功能部件群模型;应用该模型提出了工序到RMT配置方案的映射方法,并结合实例予以论证。(4)从工序和工艺路线两个层面出发,对RMT配置方案进行局部优化和全局优化。以降低RMT成本、模块数、功能冗余度为目标,采用简单线性加权法对工序可行RMT配置方案解集综合评估,再排序择优,实现了局部优化;以降低零件RMT机群的成本、模块数、功能冗余度为目标,结合理想点法和遗传算法对零件RMT机群可行配置方案解集进行优选,实现了全局优化;分别以实例证明了方法的有效性。
[Abstract]:Reconfigurable machine tool (Reconfigurable Machine Tools,RMT) is a new type of machine tool which accords with the future development trend of manufacturing industry. At present, most researchers at home and abroad regard RMT structure configuration and manufacturing process optimization as two relatively independent research contents. However, there is a relationship between the two. The cooperative optimization of manufacturing process and RMT configuration is beneficial to obtain low input and high output manufacturing system. Therefore, this paper studies the RMT configuration optimization of integrated manufacturing process in order to obtain a feasible solution. (1) on the basis of analyzing the characteristics of RMT, this paper expounds the research idea of RMT configuration optimization of integrated manufacturing process. The four-layer research architecture of the problem is constructed, the key problems involved in the research process are systematically analyzed, and the technical route to solve the related problems is determined. (2) the types of machining features of the parts are analyzed. On the basis of the formal description of machining feature forming method, the feature processing unit is defined, and the process information model of part feature processing is established, and the process constraints among feature processing units are constructed. Furthermore, the process route planning problem of parts is modeled, genetic algorithm is designed to solve the problem, and the feasibility of the method is verified by an example. (3) the RMT mechanical system is divided into sub-modules according to the functional structure. Then the functional component group is constructed according to the correlation characteristics between sub-modules, and the functional component group model is established by using the polychromatic set theory. Using this model, the mapping method from process to RMT configuration scheme is put forward and demonstrated with an example. (4) Local and global optimization of RMT configuration scheme is carried out from two aspects of process and process route. In order to reduce the cost of RMT, the number of modules and the degree of functional redundancy, a simple linear weighting method is used to evaluate the solution set of feasible RMT configuration scheme of working procedure comprehensively, and then the optimization is selected and local optimization is realized. In order to reduce the cost, the number of modules and the degree of functional redundancy of part RMT cluster, the solution set of feasible configuration scheme of part RMT cluster is optimized by using ideal point method and genetic algorithm, and the global optimization is realized. Examples are given to demonstrate the effectiveness of the method.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG502

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