基于边缘碎裂效应软推挤驱动裂纹刀伴随切削陶瓷机理

项目名称： 基于边缘碎裂效应软推挤驱动裂纹刀伴随切削陶瓷机理

项目编号： No.51475474

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 田欣利

作者单位： 中国人民解放军陆军装甲兵学院

项目金额： 85万元

中文摘要： 针对目前工程陶瓷等硬脆材料缺乏大余量去除加工手段的工程实际，提出基于边缘碎裂效应的软推挤驱动裂纹刀伴随切削陶瓷的新方法，即在切割形成凸缘结构的基础上，用软工具推挤驱动裂纹系统启动，使其快速扩展并延伸到连续产生的边缘表面形成切屑脱落，从而实现裂纹刀伴随挤压过程的立体切削。根据压痕断裂力学和损伤力学理论探讨裂纹刀伴随切削机理，模拟推挤加工中裂纹扩展直至产生切屑的演变过程，揭示推挤力与裂纹刀间协同作用的内在规律。分析裂纹扩展路径的分形特征，研究加工表面纹理与形貌特征，探讨切屑形成与表面质量的非线性映射关系。构建以加工效率、成本、表面完整性以及材料安全性为主的多元综合评价体系。采用多元回归分析、神经网络等方法，实现对加工质量和加工性能的预测。为工程陶瓷等硬脆材料的高效、低成本加工提供新途径。

中文关键词： 陶瓷加工；裂纹刀；软推挤作用；边缘效应

英文摘要： Aiming at the deficiency of high efficiency and low cost removal machining of engineering ceramics and other hard brittle materials, the new method of ceramic cutting accompany with crack knife with the action of soft broaching based on edge fragment effect was suggested. The basic principle is that based on the suspended structure, the soft tool push and drive the crack system. It is then expands and extends quickly to the surface, cut into chips and fall off inside the material. That is the three-dimensional cutting of crack knife. Via indentation fracture mechanics and damage mechanics theory, the mechanism of cutting accompany with crack knife was investigated, the expands of crack and the formation of chips during the push process was modeled, the intrinsic law of synergistic effect between the push and the crack knife was disclosed. The fractal feature of cracks' expanding path was studied, texture and morphologyfeatures of the processed surface were analyzed, the nonlinear mapping relationship between the formation of chips and surface quality was discussed. A comprehensive evaluation system focus on processing efficiency, cost, surface integrity and the safety of material was built. The multipleregressionanalysis and neural network were employed to predict the machine quality and the machine capability. To sum up, a new highly efficient and low-cost processing method for machining ceramics and other hard and brittle materials was provided.

英文关键词： Ceramic machining;Crack knife;Under the impetus of soft tools;The edge fragment