锻压技术

6061铝合金脉冲电流辅助热冲压下的摩擦特性摩擦与润滑

英文标题：Friction characteristics for 6061 aluminum alloy under pulse current assisted hot stamping

单位：（1.盐城工学院机械优集学院江苏盐城 224051 2.燕山大学机械工程学院河北秦皇岛 066004）

分类号：TG155.5

出版年,卷(期):页码：2023,48(6):191-198

摘要：

采用往复式摩擦试验机，研究了干摩擦条件下、不同电流密度对6061铝合金与P20模具钢的摩擦因数的影响。采用Origin软件进行数据处理，建立了不同电流密度下的变摩擦因数模型，并对变摩擦因数模型与定摩擦因数模型分别进行了有限元仿真及试验验证，比较了两种模型及试验验证下脉冲电流辅助热冲压成形后的厚度分布规律。结果表明：在电流密度为2~10 A·mm-2内，摩擦因数随着电流密度的增加而逐渐减小；基于不同电流密度下的变摩擦因数模型，其数据拟合程度较好；仿真与试验验证结果一致，铝合金板料的最大减薄在凸模圆角处，验证了变摩擦因数模型的准确性。

The influences of different current densities on the friction coefficients of 6061 aluminum alloy and P20 die steel under dry friction condition were studied by a reciprocating friction machine. Then, the data was processed by software Origin, and a variable friction coefficient model under different current densities was established. Furthermore, the finite element simulation and test verification of the variable friction coefficient model and the constant friction coefficient model were carried out respectively, and the thickness distribution laws of the two models and test verfication after pulse current assisted hot stamping were compared. The results show that when the current density is 2-10 A·mm-2, the friction coefficient gradually decreases with the increasing of current density. Based on the variable friction coefficient model under different current densities, the data fits well, the simulation results and the test verification results are consistent, and the maximum thinning of aluminum alloy sheet is at the fillet of the punch, which verifies the accuracy of the variable friction coefficient model.

基金项目：

国家自然科学基金资助项目（51505408）；江苏省产学研前瞻性联合研究项目（BY2022174）

刘镕滔（1998-），男，硕士研究生

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