预压应力磨削加工对氧化铝摩擦磨损性能影响试验研究

发布时间：2018-06-21 18:21

本文选题：氧化铝陶瓷 + 预应力　；参考：《湘潭大学》2017年硕士论文

【摘要】：工程陶瓷由于具有高强度、高硬度、耐高温、耐磨损等优越的性质,在各大工业领域得到了广泛的应用。随着工业技术的发展与进步,对于陶瓷零部件的要求也日益向着更加高的质量和超精密等方向发展。使用金刚石砂轮进行磨削加工是其最常用的加工方法,然而由于陶瓷材料本身的高脆、高硬难加工特性和磨削加工的高成本低效率问题,传统磨削加工难以避免产生加工损伤,磨削表面质量不易控制,加工成本高。因此,实现工程陶瓷高效、低损伤加工具有重大意义。本文针对工程陶瓷材料磨削过程中易于出现微裂纹等加工损伤以及加工效率低等问题,对陶瓷材料施加一定的预压应力,以达到抑制加工损伤的目的。本文通过磨削试验和摩擦磨损试验分别探究二维预压应力下氧化铝陶瓷的磨削机理和预压应力加工表面的摩擦磨损特性。主要包括以下研究内容:1.以脆硬材料断裂力学理论为基础,对二维预压应力下工程陶瓷在单金刚石切削模型中进行理论分析,研究了二维预压应力对陶瓷应力状态和临界切深的影响,从裂纹减少和临界切深的增大两方面来解释预压应力加工的减损机理。从陶瓷的应力状态分析可知,双向预压应力能够降低材料内部的最大拉应力和最大剪应力,从源头上减少了裂纹的产生与扩展,从而减少材料的加工损伤。从临界横截面积分析可知,临界切削横截面积随着预应力的增大而增大,并且与材料自身性质有关。2.在0MPa,200MPa,400MPa预压应力下对氧化铝陶瓷进行磨削试验。使用测力仪采集力信号,使用扫面电镜和截面抛光技术观察磨削表面/亚表面损伤。对磨削力,磨削表面形貌、磨削亚表面损伤和材料去除机理进行了分析。3.对以不同二维预压应力等磨削参数加工的氧化铝陶瓷表面进行了摩擦磨损试验。结合磨削试验,分析了不同磨削加工参数(磨削深度和二维预压应力大小)对磨削表面摩擦与磨损性能的影响。对摩擦系数、磨损量以及磨损表面形貌进行了分析。
[Abstract]:Because of its excellent properties such as high strength, high hardness, high temperature resistance and wear resistance, engineering ceramics have been widely used in various major industrial fields. With the development and progress of industrial technology, the requirements for ceramic parts are becoming more and more in the direction of higher quality and ultra precision. The most commonly used processing methods, however, because of the high brittle, hard and hard machining characteristics of the ceramic material and the high cost and low efficiency of grinding, the traditional grinding process can not avoid processing damage, the quality of the grinding surface is not easy to control and the processing cost is high. Therefore, it is of great significance to realize the high efficiency and low damage processing of the engineering ceramics. Aiming at the problems of micro crack and low machining efficiency during the grinding process of the engineering ceramic material, the ceramic material is applied to the ceramic material to restrain the machining damage. In this paper, the grinding mechanism of the two dimensional precompression stress of alumina ceramics is investigated by grinding test and friction and wear test. The main contents are as follows: 1. based on the fracture mechanics theory of brittle hard materials, the theoretical analysis of engineering ceramics under two dimensional precompression stress is carried out in a single diamond cutting model, and the effect of two-dimensional prestress on the stress state and critical depth of ceramics is studied, and the reduction of the crack is reduced. From the stress state analysis of ceramics, it can be seen from the stress state analysis of ceramics that the maximum tensile stress and maximum shear stress in the material can be reduced by the bi-directional prestress stress, and the production and expansion of the cracks are reduced from the source, and the processing damage of the material is reduced. The analysis of the critical cross section area is analyzed. It is known that the cross section area of critical cutting increases with the increase of prestress, and is related to the grinding test of the alumina ceramics under the prestress of 0MPa, 200MPa, and 400MPa with the property of the material itself. Using the force signal of the dynamometer, the surface / subsurface damage of the grinding surface is observed by the scanning electron microscope and the cross section polishing technique. The grinding force and grinding are used for grinding force and grinding. The surface morphology, grinding subsurface damage and material removal mechanism were analyzed. The friction and wear tests on the surface of alumina ceramics processed with different two dimensional prestress stress and other grinding parameters were carried out. The friction and wear of the grinding surface with different grinding parameters (grinding depth and two dimension prestress stress size) were analyzed combined with the grinding test. The friction coefficient, wear volume and wear surface morphology were analyzed.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ174.6

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