修复速度对脉冲冷焊修复层温度场的影响

发布时间：2018-08-29 19:39

【摘要】：脉冲冷焊修复速度是决定修复层质量的关键因素。为了确定不同修复速度对脉冲冷焊修复层温度场的影响,在45钢试样表面加工一尺寸为50mm×6mm×1mm的长方体缺口,对缺口进行脉冲冷焊修复。首先建立了三维有限元分析模型,并以体载荷形式,给修复过程中不断激活的单元体施加生热率的方式模拟出在不同修复速度下的温度场动态分布。探讨了修复层温度场的变化特征。然后利用DZMH-6脉冲冷焊机设备、热电偶和XSR30无纸记录仪确定了真实温度场分布规律。研究表明:在2.3mm/s时的温度上升速度和温度峰值比在2.5mm/s时大,数值模拟的温度场结果与实际测量结果吻合性较高。采用生死单元技术和体生热率热源方式可有效预测真实脉冲冷焊修复过程温度场。
[Abstract]:The repair speed of pulsed cold welding is the key factor to determine the quality of repair layer. In order to determine the effect of different repair speed on the temperature field of pulsed cold welding repair layer, a cuboid notch of 50mm 脳 6mm 脳 1mm was fabricated on the surface of 45 steel sample, and the notch was repaired by pulsed cold welding. Firstly, a three-dimensional finite element analysis model is established, and the dynamic distribution of temperature field under different repair speeds is simulated by applying heat generation rate to the continuously activated element body in the form of volume load. The variation characteristics of temperature field in repair layer are discussed. Then the true temperature field distribution is determined by using DZMH-6 pulse cold welding machine, thermocouple and XSR30 paperless recorder. The results show that the temperature rise velocity and the temperature peak value at 2.3mm/s are larger than those at 2.5mm/s, and the results of numerical simulation are in good agreement with the measured results. The temperature field of real pulse cold welding repair process can be predicted effectively by using birth and death element technique and heat source of body heat generation rate.
【作者单位】：江西理工大学机电工程学院;
【基金】：国家地方联合工程实验室开放基金项目(201713) 江西省自然科学基金项目(2012BAB206026) 江西省教育厅资助项目(GJJ14424)
【分类号】：TG44

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