多力热场非线性叠加作用的薄壁件铣削残余应力重分布生成机理研究

项目名称： 多力热场非线性叠加作用的薄壁件铣削残余应力重分布生成机理研究

项目编号： No.51505291

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 机械、仪表工业

项目作者： 江小辉

作者单位： 上海理工大学

项目金额： 20万元

中文摘要： 本项目研究薄壁件铣削中多力热源与残余应力之间的映射关系，提出一种控制残余应力场，以提高薄壁件加工精度长期稳定性的新方法。具体内容包括：基于单/多工序中力热控制，建立以减小或抑制残余应力分布影响为控制目标的计算模型及其边界与初始条件；将残余应力重分布生成的多影响因素问题转化为以力热为输入源控制，建立直接表征残余应力的宏观定量相关性评估模型；在此模型基础上，分别探索单因素作用下的残余应力叠加关系，揭示薄壁件铣削残余应力的重分布生成规律，并提出耦合多应力场的工艺优化方案；最终形成一套基于案例和原则的控制残余应力以改善薄壁件二次变形的理论方法、工艺方案与仿真技术。本项目旨在突破薄壁件铣削加工中残余应力难以控制的技术瓶颈，指导实际生产中加工工艺方案的设计与优选，形成具有自主知识产权的解决薄壁件残余应力问题的核心技术。

中文关键词： 残余应力；加工精度；薄壁件；切削力；切削温度

英文摘要： This proposal investigates the mapping between the multiple force-thermal source and residual stress of milling for thin-walled part, and proposes a new method by controlling the residual stress field, so that the long-term stability of the machining precision of thin-wall parts can be improved. The specific contents include: Based on the control of the force and thermal in the single / multiple process, to reduce or suppress the influence of the residual stress distribution, a calculation model, boundary and initial conditions is built; Transforming the issue of residual stress generation affected by many factors into controlling the input source of the force and heat, establishing the macro-quantitative correlation evaluation model of direct characterization of residual stress; based on this model, exploring the effect of single factor on the superposition of residual stress respectively, revealing the generation rules of re-distribution of residual stress in the milling of the thin-wall parts, and putting forward the process optimization scheme by coupling the multiple stress field; eventually forming the theoretical method, processing scheme and simulation technology, which is based on the case and principle, so that the deformation of the thin-wall part is improved by controlling the residual stress. The project aims to break through the technical bottleneck of residual stress which is difficult to control in the milling process of thin-walled parts, guide the design and optimization of processing in the actual production process scheme, form the core technology with independent property rights on the to solve the issue of residual stress of the thin-walled parts.

英文关键词： Residual stress ;Machining accuracy;Thin-walled part;Cutting force;Cutting temperature