面向认知公差的精密冲压工艺适应性设计方法（英文）

发布时间：2018-07-28 07:48

【摘要】：目的:精密冲压工艺过程中环境变量的波动导致工件出现破裂和皱褶等缺陷。探讨精密冲压工艺过程中环境变量(工件材质、冲压速度、压力、模具间隙和温度变化等)对冲压质量的影响,研究适应性工艺设计方法,提高精密冲压工件的质量。创新点:1.通过马尔科夫模型方程,推导出环境变量与精密加工波动公差之间的关系;2.建立试验模型,成功模拟适应性冲压工艺过程。方法:1.通过实验分析,推导出冲压过程中的晶粒流动和强度变化对成型零件的尺寸公差波动产生较大的影响(图2和3);2.通过理论推导,构建环境变量与加工波动公差之间的关系,得到适应性的工艺参数调节方案(公式16);3.通过仿真模拟,运用适应性设计方法在精密冲压过程中对工艺参数进行适应性调节,验证所提方法的可行性和有效性(图5)。结论:1.精密冲压过程中工艺参数需要根据不同的环境变量进行调节;2.环境变量与加工波动公差之间存在映射关系,运用隐马尔科夫模型实现关联表征;3.运用适应性设计方法对精密冲压工艺参数进行调节,加工波动公差明显减小,工件质量得到提高。
[Abstract]:Objective: the fluctuation of environmental variables in precision stamping process leads to defects such as fracture and wrinkle. This paper discusses the influence of environmental variables (material, speed, pressure, gap and temperature change of die) on the quality of stamping in the process of precision stamping, and studies the method of adaptive process design to improve the quality of precision stamping. The innovation point is 1: 1. Through the Markov model equation, the relation between the environmental variables and the fluctuation tolerance of precision machining is deduced. The test model was established and the adaptive stamping process was successfully simulated. Method 1: 1. Through experimental analysis, it is deduced that the change of grain flow and strength during stamping process has a great influence on the fluctuation of dimensional tolerance of forming parts (Fig. 2 and 3). Based on the theoretical derivation, the relationship between the environmental variables and the tolerance of machining fluctuation is established, and the adaptive process parameter adjustment scheme (formula 16) is obtained. Through simulation and simulation, the adaptive design method is used to adjust the process parameters in the process of precision stamping to verify the feasibility and effectiveness of the proposed method (Fig. 5). Conclusion 1. The process parameters need to be adjusted according to different environmental variables in the process of precision stamping. There is a mapping relationship between environmental variables and processing fluctuation tolerance. With the adaptive design method, the precision stamping process parameters are adjusted, the machining fluctuation tolerance is obviously reduced, and the quality of the workpiece is improved.
【作者单位】： The
【基金】：Project supported by the National Natural Science Foundation of China(Nos.51322506,51175456,and 51305284) the National Basic Research Program (973) of China(No.2011CB706702) the Zhejiang Provincial Natural Science Foundation of China(No.LR14E050003) the Fundamental Research Funds for the Central Universities the Innovation Foundation of the State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,China
【分类号】：TG386

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