旋转叶轮机械工艺决策支持技术与系统研究

发布时间：2018-05-12 01:18

本文选题：工艺规划 + 旋转叶轮　；参考：《重庆大学》2012年硕士论文

【摘要】：工艺规划是工艺设计人员根据机械制造工艺学的相关原理和方法，规定产品或零件制造工艺过程和操作方法的关键技术活动，科学合理地进行产品工艺优化决策是企业核心技术竞争力的重要体现，也是提高企业生产效率、降低制造成本和生产能耗的有效手段。旋转叶轮是涡轮机的核心部件，其加工质量对涡轮机性能有决定性的影响，但其结构复杂，特别是复杂的叶片曲面加工一直是制约产品整体性能提升的瓶颈，也是衡量叶轮加工工艺水平的重要标志，因而关于旋转叶轮工艺改进优化的研究一直是机械制造领域的一项研究热点。鉴于工艺规划在机械制造领域的重要性和旋转叶轮的重要功用及其结构特征，本文以整体提升旋转叶轮机械工艺决策水平为研究目的，以重庆某增压器厂的叶轮产品为研究对象，提出了一套旋转叶轮机械工艺决策方法，并基于该方法设计了一套原型系统，从而为旋转叶轮加工工艺的优化决策提供技术支撑。首先，研究旋转叶轮工艺路线优化方法。根据旋转叶轮的结构特征，，将工艺人员实践经验和科学算法有效结合，提出一种基于模糊综合评判和遗传算法的旋转叶轮工艺路线优化决策方法，通过基于模糊综合评判的工艺特征加工方案决策和基于遗传算法的工序/工步优化排序，最终得到可行并优化的工艺路线。其次，研究旋转叶轮切削参数优化方法。通过分析旋转叶轮加工特征，建立面向多工序的切削参数优化模型，并根据优化问题特征设计一种复合形算法对模型进行求解，最终得到科学合理的切削参数。再次，对机械工艺决策过程中的部分关键技术进行了研究。考虑生产过程中工序质量预测和出现质量问题时的有效追溯，研究工序关联关系；考虑在工艺设计阶段有效规避生产过程中频繁出现的瓶颈工序，研究瓶颈工序预测方法与规避及处理策略；提出一种工时定额制定方法，实现工时定额的科学规范管理。最后，基于上述方法体系，设计了一套旋转叶轮机械工艺决策支持原型系统，包括系统业务流程、技术方案、体系结构、功能模型以及数据库信息模型等的设计。并将本文研究内容在重庆某增压器厂叶轮产品的工艺设计中进行了应用，取得了良好的应用效果。
[Abstract]:Process planning is a key technical activity in which process planners specify the manufacturing process and operation methods of products or parts according to the relevant principles and methods of mechanical manufacturing technology. Scientific and reasonable decision-making of product process optimization is an important embodiment of the core technological competitiveness of enterprises and an effective means to improve production efficiency and reduce manufacturing costs and production energy consumption. Rotating impeller is the core part of turbine, and its machining quality has a decisive effect on turbine performance, but its structure is complex, especially the complicated blade surface processing is the bottleneck to improve the overall performance of the product. It is also an important indicator to measure the processing technology level of the impeller, so the research on the technological improvement and optimization of the rotary impeller is always a hot research topic in the field of mechanical manufacturing. In view of the importance of process planning in the field of mechanical manufacturing and the important functions and structural characteristics of rotating impeller, the purpose of this paper is to improve the level of technological decision-making of rotating impeller machinery as a whole. Taking the impeller products of a turbocharger factory in Chongqing as the research object, a set of technology decision method for rotating impeller machinery is put forward, and a prototype system is designed based on this method, which provides technical support for the optimization decision of rotary impeller processing technology. Firstly, the optimization method of rotating impeller technological route is studied. According to the structural characteristics of rotating impeller, combining the practical experience of craftsmen with scientific algorithm effectively, a method of optimizing the technological route of rotating impeller based on fuzzy comprehensive evaluation and genetic algorithm is put forward. Through the decision of process feature processing scheme based on fuzzy comprehensive evaluation and the optimization of process / step ranking based on genetic algorithm, a feasible and optimized process route is obtained. Secondly, the optimization method of cutting parameters of rotating impeller is studied. By analyzing the machining characteristics of rotating impeller, a multi-process oriented cutting parameter optimization model is established, and a complex algorithm is designed to solve the model according to the characteristics of the optimization problem. Finally, scientific and reasonable cutting parameters are obtained. Thirdly, some key technologies in the process of mechanical process decision are studied. Considering the prediction of process quality in production process and the effective tracing of quality problems, the relationship between processes is studied, and the frequently occurring bottleneck processes are effectively avoided in the stage of process planning. This paper studies the prediction method of bottleneck working procedure and the strategy of avoiding and dealing with it, and puts forward a method of establishing man-hour quota, which can realize the scientific and normative management of man-hour quota. Finally, based on the above method system, a prototype system of process decision support for rotating impeller machinery is designed, including the design of system business process, technical scheme, architecture, function model and database information model. The research content is applied in the process design of the impeller product of a turbocharger factory in Chongqing, and a good application effect is obtained.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH16

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