基于高静水压磨削方法的工程陶瓷高效低损伤磨削基础研究

项目名称： 基于高静水压磨削方法的工程陶瓷高效低损伤磨削基础研究

项目编号： No.51275436

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 张高峰

作者单位： 湘潭大学

项目金额： 80万元

中文摘要： 工程陶瓷因其良好的力学与物理性能而在能源、航空航天、军工、冶金等行业获得广泛应用，金刚石砂轮磨削是陶瓷加工最常用的加工方法之一。然而，由于工程陶瓷的高硬度、高脆性与低断裂韧性，如何抑制磨削损伤并有效提高加工效率，一直是困扰工程界的难题。本项目提出了工程陶瓷的高静水压磨削加工方法，利用高静水压力（100-400MPa）使陶瓷在X、Y、Z三个方向均承受较大的压应力，以抑制磨削中亚表面中位裂纹的形成与扩展，有效提高工程陶瓷无损伤磨削的临界切深，从而提高工程陶瓷的低损伤磨削效率。并基于断裂力学与弹塑性力学，通过离散元模拟与试验相结合的方法，建立磨削工艺参数-陶瓷力学性能-加工损伤之间的关系模型，揭示高静水压磨削的材料去除机理与表面/亚表面裂纹损伤形成机制，建立高静水压磨削工程陶瓷的高效低损伤加工理论。通过本项目研究，将有望解决工程陶瓷加工效率与低损伤无法皆得的难题，从而推动工程陶瓷更为广泛的应用。

中文关键词： 工程陶瓷；高静水压；磨削；声发射；低损伤

英文摘要： Engineering ceramics is widely used in the energy, aerospace, military, metallurgy and other industries because of its good mechanical and physical properties. Diamond wheel grinding is one of the most commonly methods in their machining process. However, due to the high hardness, high brittleness and low fracture toughness of engineering ceramics, how to suppress the grinding surface damage and improve the processing efficiency is a problem in the academia and the engineering areas. This project present the high hydrostatic pressure grinding method of engineering ceramics, the engineering ceramic is pressed by three directions while in grinding process based on the high hydrostatic pressure (200-500MPa), thus the formation of sub-surface grinding cracks is inhibited and improve the critical depth of grinding without damage of the engineering ceramics, and greatly improve the efficiency of the engineering ceramics grinding. Based on the theory of fracture mechanics and elastic-plastic mechanics, the match model of hydrostatic pressure-grinding parameters-critical depth with no grinding damage will be established by discrete element simulation and experimental method to reveale the material removal mechanism of high hydrostatic pressure grinding and the mechanism of surface damage formation, the high efficiency a

英文关键词： Engineering Cramics；High Hydrostatic Pressure；Grinding；AE；Low Damage