毛坯力学特性对旋锻连接强度的影响研究

Study on the Influence of Blank Mechanical Properties on the Strength of Rotary Swaging Connections

摘要: 以某空调铜铝管旋锻连接为对象，用理论结合仿真的方法研究毛坯力学特性对旋锻连接强度的影响。理论研究结果表明，旋锻连接依靠塑性变形产生的弧形接头和管件重叠部分产生的附加焊接效应保证连接强度；毛坯力学特性变化影响旋锻连接强度。对不同硬度下的毛坯进行旋锻连接和拉伸试验模拟仿真，结果表明：在材料能力范围内，随着毛坯硬度的增加，旋锻连接强度随之增加；毛坯力学特性和旋锻连接强度之间呈正相关，且为非线性；当毛坯硬度超过材料能力范围时，旋锻连接可能出现缺陷，连接强度降低。研究结果为工程上利用旋锻工艺进行材料连接保证和提高连接强度提供技术和理论支持。

Abstract: This study focuses on the rotary swaging connection of copper-aluminum tubes in air conditioning systems, employing a combination of theoretical analysis and simulation to investigate the influence of blank mechanical properties on the strength of rotary swaging connections. Theoretical research indicates that the strength of rotary swaging connections is ensured by plastic deformation and the additional welding effect generated by the overlapping sections of the tubes. Variations in the mechanical properties of the blank significantly affect the connection strength. Simulations of rotary swaging and tensile tests were conducted on blanks with different hardness levels. The results demonstrate that, within the material’s capability range, the strength of the rotary swaging connection increases with the hardness of the blank, showing a positive, nonlinear correlation between the blank’s mechanical properties and the connection strength. However, when the blank hardness exceeds the material’s capability range, defects may occur in the rotary swaging connection, leading to a reduction in connection strength. The findings provide technical and theoretical support for ensuring and enhancing connection strength in engineering applications utilizing rotary swaging processes for material joining.