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7075航空铝合金薄壁框架件加工变形的预测是构件形变控制领域的技术难题,掌握铝合金薄壁框架件上的加工应力分布对预测构件变形有着重要的作用.本文运用弹性力学理论,在实验基础上,利用层削法和X射线衍射应力测试技术,建立了薄壁框架件的应力与弯曲变形的力学模型.模型反映了加工应力和初始应力对构件实际变形的影响机制,在此基础上,再通过数学解析方法,以这两种应力场分布为主变量,构建了薄壁框架构件应力与变形的函数,完成了对构件最大变形挠度的计算.通过比较实验所测构件变形值与计算得到的变形结果发现:构件实际测量最大变形量基本处于数学解析函数计算变形区间内,数据偏差在20~50μm.研究结果表明:在已知初始应力、结构尺寸、加工参数条件下,解析函数能有效地预测出薄壁框架件加工后的变形,可为薄壁构件加工变形控制提供工艺指导.
7075 Aerospace Aluminum Alloy Thin-walled Frame Component Deformation Prediction is a technical problem in the field of component deformation control, mastering the distribution of machining stress on the aluminum alloy thin-walled frame component plays an important role in predicting component deformation.In this paper, using the theory of elastic mechanics, Based on this, the mechanical model of stress and bending deformation of thin-walled frame members is established by the layer-cut method and the X-ray diffraction stress testing technique.The model reflects the influence mechanism of the processing stress and the initial stress on the actual deformation of the member, , And then through mathematical analysis, taking these two kinds of stress field distributions as the main variables, the function of stress and deformation of the thin-walled frame member is constructed, and the calculation of the maximum deformation deflection of the member is completed. By comparing the deformation values and the calculated The results of deformation show that the maximum deformation of the component is almost within the calculated deformation interval of the mathematical analytic function and the data deviation is in the range of 20 ~ 50μm. The results show that under the known initial stress, structural size and processing parameters, Effectively predict the deformation of the thin-walled frame parts after machining, and provide the process control for the deformation control of the thin-walled parts guide.