织构化过盈配合界面拆解性能和承载能力的试验研究

发布时间：2018-02-22 00:44

本文关键词： 表面织构过盈配合拆解损伤静摩擦系数再制造　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：再制造拆解是再制造的前提,过盈配合在机械装备中普遍存在,在再制造拆解时常常会造成配合界面损伤而导致零件无法再制造。本文以大型离心压缩机叶轮和主轴的过盈配合界面为研究载体,运用拆解模拟试验、表面最大静摩擦系数测量试验、计算机仿真模拟等方法对凹坑织构化过盈配合界面的拆解性能和承载能力进行了探索性研究。本文建立了过盈配合配对试件模型,设计了拆解模拟试验台,根据拆解模拟试验的损伤表面分析了拆解损伤的形成机理,确定了损伤体积为评价参数。采用激光加工的方式对模拟过盈配合的试件表面进行织构化处理,在试件表面加工出不同直径和面密度的圆凹坑织构。在不同的载荷下对试件进行拆解模拟正交试验,得出能使拆解界面损伤最小的最优织构参数。通过对比最优织构参数条件下的配合界面和非织构配合界面的拆解性能,发现表面织构能显著减小过盈配合的拆解损伤,通过表面硬度值地测量、表面受力仿真分析和试件的显微镜图对织构降低拆解损伤的机理进行了分析。最后,通过最大静摩擦系数的测定试验证明了凹坑织构能够较大程度地提高配合界面的承载能力,同时经过多次拆解模拟,织构表面仍有不低于非织构表面的承载能力。从再制造的角度,将表面织构运用于过盈配合界面减小拆解损伤是可行的。
[Abstract]:Remanufacturing dismantling is the premise of remanufacturing. Interference fit is common in machinery and equipment. In this paper, the interference fit interface of impeller and spindle of a large centrifugal compressor is used as the research carrier, and the disassembly simulation test is used. The surface maximum static friction coefficient measurement test and computer simulation were used to study the disassembling performance and bearing capacity of the interference fit interface of the pit texture. A model of interference fit pairing specimen was established in this paper. The disassembly simulation test bench was designed, and the formation mechanism of the disassembly damage was analyzed according to the damage surface of the disassembly simulation test. The damage volume was determined as the evaluation parameter. The surface of the sample with simulated interference fit was textured by laser processing. The circular pit texture with different diameters and surface densities was machined on the surface of the specimen. The optimal texture parameters, which can minimize the damage of the interface, are obtained. By comparing the disassembly properties of the fit interface and the non-texture interface under the optimal texture parameters, it is found that the surface texture can significantly reduce the disassembly damage of the interference fit. The mechanism of texture reduction is analyzed by measuring the hardness of the surface, simulating the force on the surface and the microscope of the specimen. Through the test of the maximum static friction coefficient, it is proved that the pit texture can improve the bearing capacity of the interface to a great extent, and at the same time, it has been disassembled and simulated many times. The texture surface still has the bearing capacity of the non-texture surface. It is feasible to apply the surface texture to the interference fit interface to reduce the disassembly damage from the point of view of remanufacture.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH131.7

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