| 引用本文: | 马旭东,赵颖,运新兵,刘元文,裴久杨,易飞.U型铜材连挤连展工艺产品极限尺寸的研究[J].材料科学与工艺,2022,30(4):86-96.DOI:10.11951/j.issn.1005-0299.20210216. |
| MA Xudong,ZHAO Ying,YUN Xinbing,LIU Yuanwen,PEI Jiuyang,YI Fei.Research on limit size of U-shaped copper produced by continuous extrusion and continuous flattening process[J].Materials Science and Technology,2022,30(4):86-96.DOI:10.11951/j.issn.1005-0299.20210216. |
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| U型铜材连挤连展工艺产品极限尺寸的研究 |
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马旭东1,赵颖1,运新兵1,刘元文1,裴久杨1,易飞2
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(1.大连交通大学 连续挤压教育部工程研究中心,辽宁 大连 116028;2.大连康丰科技有限公司,辽宁 大连 116028)
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| 摘要: |
| 采用U型模具连续挤压铜板带时,U型产品尺寸的变化对连续挤压成型过程会产生较大的影响。为了降低模具研发成本,本文通过有限元模拟与解析法得到了U型产品可挤压的极限尺寸。采用有限元法与理论计算研究了不同几何参数比(厚度挤压比λ1、直径扩展比λ2、产品宽厚比λ3)对U型连续挤压产品的流速均方差(SDV)以及模具型腔压力σx、挡料块应力pd和挤压轮扭矩T的影响规律,并建立了模具型腔内接触应力和挤压轮扭矩的函数模型。研究表明:随着λ1的增大,出口截面的速度差越来越大,SDV值增加幅度明显；λ2增大,流速最快区域从U型两侧转移至圆弧处,SDV值变化范围不大。通过主应力法计算得到U型模具腔体内压应力σx与产品尺寸r0的函数,利用上限法求解出挡料块应力pd与腔体进料口压力pk的关系。将SDV、pd、T作为挤压极限厚度的判定标准,当坯料直径为30 mm,展平宽度为420 mm时,得到可挤压的极限厚度为7 mm。U型铜带连续挤压实验表明,实验结果与理论扭矩对比,误差可控制在10%以内,证明了理论计算极限尺寸的可行性与准确性。 |
| 关键词: 铜带 连续挤压 SDV 成型载荷 解析法 |
| DOI：10.11951/j.issn.1005-0299.20210216 |
| 分类号:TG379 |
| 文献标识码:A |
| 基金项目:辽宁省教育厅项目(JDL2019001)；大连市科技创新基金项目(2018J11CY027);辽宁省科技攻关计划项目(2021JH1/10400080). |
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| Research on limit size of U-shaped copper produced by continuous extrusion and continuous flattening process |
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MA Xudong1, ZHAO Ying1, YUN Xinbing1, LIU Yuanwen1, PEI Jiuyang1, YI Fei2
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(1.Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, Dalian 116028, China;2.Dalian Konform Technical Company Ltd., Dalian 116028, China)
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| Abstract: |
| When using U-shaped dies to continuously extrude copper strips, the changes in the size of the U-shaped products have a great impact on the continuous extrusion molding process. In order to reduce the cost of mold research and development, the extrudable limit size of U-shaped products was obtained through finite element simulation and analytical method. The finite element method and theoretical calculation were adopted to investigate the influences of different geometric parameter ratios (thickness extrusion ratio λ1, diameter expansion ratio λ2, and product width-thickness ratio λ3) on the mean square deviation of flow velocity (SDV) of U-shaped products by continuous extrusion, die cavity pressure σx, stopper block stress pd, and torque T of extrusion wheel. The function model of the contact stress in the die cavity and the torque of the extrusion wheel was established. Research results show that with the increase in λ1, the velocity difference at the outlet section became larger, and the SDV value increased significantly; with the increase in λ2, the area with the fastest flow velocity shifted from the two sides of the U-shape to the arc part, and the SDV value varied in a small range. The function of the pressure σx in the U-shaped die cavity and the product size r0 was obtained by principal stress method, and the upper limit method was used to solve the relationship between the stopper block stress pd and the cavity inlet pressure pk. Taking SDV, pd, and T as the criteria for determining the ultimate thickness of extrusion, when the diameter d of the billet was Φ30 mm and the flattening width b was 420 mm, the ultimate thickness t that could be extruded was 7 mm. The continuous extrusion experiment of U-shaped copper strip showed that the error between the experimental results and the theoretical torque values was controlled within 10%, which proved the feasibility and accuracy of the theoretical calculation of the limit size. |
| Key words: copper strip continuous extrusion SDV forming load analytical method |
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