制造对象过盈配合的液压拆解问题研究

发布时间：2018-06-08 02:31

本文选题：再制造 + 过盈配合　；参考：《合肥工业大学》2013年硕士论文

【摘要】：再制造与传统制造相比具有诸多明显优势,研究再制造的关键科学问题,契合国家可持续发展的迫切需求、符合国家的重大战略目标。大型长输管线压缩机机组是天然气输送管道的核心设备,是保障西气东输能源大动脉安全可靠运行的关键,大型长输管线压缩机在长期服役过程中由于高周疲劳、冲蚀、腐蚀等原因,易导致压缩机叶轮失效而需要进行再制造,拆解是再制造无损检测和修复的前提,是再制造整体工艺不可或缺的一部分,但针对离心压缩机叶轮和主轴这类大尺寸、大过盈、高精度再制造对象的无损拆解机理的研究很少。为此,本文以量大面广、具有高附加值的机械装备的核心部件,如大型压缩机为主要研究载体,研究机械装备在多场耦合作用下的约束解除机理以及无损拆解方法,综合运用理论分析、回归分析、数值模拟等方法针对再制造对象液压拆解问题进行探索性研究,基于过盈配合接触理论,分析了再制造对象的约束特性,提出了液压拆解过程中存在的三种润滑模型,验证了液压拆解的可能性并分析了液压拆解对于再制造对象缺陷的影响。分析结果表明在过盈配合接触面开设油槽并注入一定压力的液压油能减小两接触面的过盈量,使得两接触面处于边界润滑和流体润滑状态,液压方法可以实现再制造对象无损拆解,同时液压作用未对盖盘边缘裂纹及叶片初始裂纹造成实质性损伤,但过大的液压压力会使叶片根部裂纹尖端区域的应力接近材料的屈服极限,可能导致根部裂纹扩展。
[Abstract]:Compared with traditional manufacturing, remanufacturing has many obvious advantages. To study the key scientific problems of remanufacturing accords with the urgent need of national sustainable development and accords with the great strategic goal of the country. The large long-distance pipeline compressor unit is the core equipment of the natural gas pipeline, and the key to ensure the safe and reliable operation of the energy artery of the West-to-East gas transmission pipeline. During the long service period, the large long-distance pipeline compressor is washed away because of high cycle fatigue. Corrosion is easy to cause compressor impeller failure and need to be remanufactured. Disassembly is a prerequisite for non-destructive testing and repair of remanufacturing, and is an indispensable part of the overall remanufacturing process. However, few researches have been done on the nondestructive dismantling mechanism of centrifugal compressor impellers and spindles such as large size, large interference and high precision remanufacturing objects. Therefore, this paper focuses on the core components of machinery and equipment with large quantity and high added value. Such as the large compressor as the main research carrier, the mechanism of constraint release and the method of nondestructive disassembly of mechanical equipment under the action of multi-field coupling are studied, and the theoretical analysis and regression analysis are used synthetically. Based on the interference fit contact theory, the constraint characteristics of the remanufacturing object are analyzed, and three lubrication models in the process of hydraulic disassembly are proposed. The possibility of hydraulic disassembly is verified and the influence of hydraulic disassembly on the defect of remanufactured object is analyzed. The two contact surfaces are in the condition of boundary lubrication and fluid lubrication. The hydraulic method can realize the non-destructive dismantling of the remanufacturing object, and the hydraulic action does not cause substantial damage to the edge crack of the cap plate and the initial crack of the blade. However, if the hydraulic pressure is too large, the stress at the crack tip of the blade root will approach the yield limit of the material, which may lead to the crack propagation at the root.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TE974;TH137

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