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| 基于响应面法的镁合金轮毂等温成形过渡区折叠缺陷的预测 |
| Prediction of Folding Defects in Isothermal Forming Transition Zone of Magnesium Alloy Hub Based on Response Surface Method |
| Received:November 17, 2023 |
| DOI：10.3969/j.issn.1674-6457.2024.04.014 |
| 中文关键词: 镁合金轮毂 等温成形 折叠缺陷 折叠指数 响应面法 |
| 英文关键词: magnesium alloy hub isothermal forming folding defect folding index response surface method |
| 基金项目:国家自然科学基金(51905156);河南省高等学校重点项目(20A460014) |
| Author Name | Affiliation | | LI Fumeng | Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, College of Materials Science and Engineering, Henan University of Science and Technology, Henan Luoyang 471000, China | | GUO Junqing | Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, College of Materials Science and Engineering, Henan University of Science and Technology, Henan Luoyang 471000, China | | CHEN Fuxiao | Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, College of Materials Science and Engineering, Henan University of Science and Technology, Henan Luoyang 471000, China | | XIANG Nan | Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, College of Materials Science and Engineering, Henan University of Science and Technology, Henan Luoyang 471000, China |
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| 中文摘要: |
| 目的 大尺寸镁合金汽车轮毂塑性在加工过程中易出现折叠等缺陷，为获得合格的轮毂锻件，对镁合金轮毂等温成形工艺参数与折叠缺陷长度的影响关系进行研究。方法 基于轮毂复杂的几何结构，设计了三步成形工艺方案，通过成形试验测试判断出折叠缺陷产生位置，选取影响轮毂折叠缺陷的压下量h、挤压温度t、挤压速度v与摩擦因数m作为设计变量，构建了轮毂最大折叠长度Llap的目标函数关系式。结合响应面法的线性模型和Design Expert软件，对设计变量进行了参量约束条件下的多目标优化，制备出合格的镁合金轮毂锻件。结果 基于成形试验得到折叠缺陷产生位置为轮辐和轮缘结合处;基于响应面法和有限元分析，可知压下量对折叠缺陷长度Llap影响最大;根据拟合结果得到的回归线性模型，其折叠缺陷回归系数为0.965 4，可靠性较高。结论 建立了镁合金轮毂锻件成形过程中工艺参数对折叠缺陷长度的线性回归模型，获得了关于折叠长度的最小值，为消除轮毂锻件中的折叠缺陷提供了理论依据。 |
| 英文摘要: |
| Since large-size magnesium alloy hub is prone to folding and other defects during processing due to plasticity, the work aims to study the effect of isothermal forming process parameters on the length of folding defects of magnesium alloy hub, in order to obtain qualified hub forgings. Based on the complex geometry of the hub, a three-step forming process was designed. The location of the folding defect was determined by the forming test. The objective function relation of the maximum folding length Llapof the hub was established by selecting the reduction amount h, extrusion temperature t, extrusion speed v and friction coefficient μ as the design variables. According to the linear model of response surface method and the Design Expert, the design variables were optimized under the condition of parametric constraint, and qualified magnesium alloy hub forging was prepared. Based on the forming test, it was found that the folding defect occurred at the joint of spoke and rim. Based on the response surface method and finite element analysis, it was found that the reduction had the greatest effect on the folding defect length Llap. According to the fitting results, the regression coefficient of folding defect was 0.965 4, and the reliability was high. The linear regression model of the process parameters on the length of folding defects in the forming process of magnesium alloy hub forgings is established, and the minimum value of folding length is obtained, which provides a theoretical basis for the elimination of folding defects in hub forgings. |
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