摘要
为模拟A356铝合金汽车轮辋的搅拌摩擦焊接,利用移动坐标系坐标转换方法,基于傅里叶定律定义了引入焊接速度项的热传导控制方程以降低建模难度。摩擦产热采用剪切摩擦模型,根据能量守恒定律,通过微积分方程并考虑了功能转化的效率,合理推导出轴肩与搅拌针作用域的产热公式,并根据轮辋对称结构简化计算模型,进而建立轮辋的搅拌摩擦焊接传热模型。通过相同焊接工艺条件下轮辋焊缝轮廓形貌模拟与试验结果对比,验证了建立的搅拌摩擦焊接传热模型的有效性和准确性,可用于优化轮辋焊接工艺参数和研究轮辋搅拌摩擦焊接机制。
For simulation of friction stir welded A356 aluminum alloy wheel rim,the coordinate transformation method about the moving coordinate system was used based on Fourier law to define the heat conduction governing equation containing the term of welding speed,which was introduced to reduce the modeling difficulty.Friction heat production used the shear friction model,according to the law of conservation of energy,the calculus equation considering the function conversion efficiency was used to deduce the reasonable heat production formula of the shoulder and stir tool,and according to the rim symmetric structure,calculation model was simplified,and heat transfer model of friction stir welding rim was established.The comparison of the rim weld profile morphology simulation under the condition of the same welding process with the experimental results verifies the effectiveness and accuracy of friction stir welding heat transfer model,which can be used to optimize the rim welding process parameters and to understand the welding mechanism of friction stir welded wheel rim.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2016年第1期16-19,共4页
Special Casting & Nonferrous Alloys
基金
浙江省教育厅科研资助项目(Y201330181)
关键词
移动坐标系
A356铝合金
汽车轮辋
传热模型
剪切摩擦
Moving Coordinate System
A356Aluminum Alloy
Wheel Rim
Heat Transfer Model
Shear Friction
Weld Seam Profile
Work-energy Transformation
作者简介
第一作者简介：李志伟，男，1986年出生，讲师，浙江工业职业技术学院汽车分院，浙江省绍兴市镜湖新区曲屯路151号（312000），电话：057588009269，E-mail：yeah1578@126．com
