2024铝合金搅拌摩擦连接作用力幅值及周期性
Amplitude and periodicity of friction stir joining force of 2024 aluminum alloy
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摘要: 利用八角环测力仪和高速摄像对2024铝合金搅拌摩擦连接过程作用力和搅拌头轴肩径向跳动量进行测量研究.结果表明，作用力具有周期振动的特性，通过试验证明了周期大小只与旋转速度有关，且为旋转速度的倒数.分析了作用力周期性振动的主要原因是连接过程中主轴的径向跳动和金属材料的流动，通过研究作用力幅值和搅拌头径向跳动量的关系，表明作用力幅值随搅拌头径向跳动量线性增加，搅拌头径向跳动是作用力产生周期振动的主因，同时，在搅拌头径向跳动量及其它工艺相同的情况下，作用力振幅会随着连接速度的增大而增大.Abstract: The force and radial runout of tool during friction stir welding of 2024 aluminum alloy were measured by using octagonal ring dynamometer and high-speed photography. The experiments confirmed that there was a periodic variation in the force patterns along three directions and the periodicity of variation was equal to the time taken for one complete rotation of tool. The periodic force oscillation was mainly caused by the radial runout of tool and the material flow around the tool. The results imply that with the increase of radial runout of tool, the amplitude of variation of these forces linearly increased. The radial runout of tool had a major influence on the amplitude by studying the relationship between amplitude and radial runout of tool. The amplitude increased with the increase of joining speed, while keeping the radial runout of tool and other process parameters consistant.
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Keywords:
- aluminum alloy /
- friction stir joining /
- tool force /
- radial runout of tool
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