针对运载火箭共底贮箱独特的密封锁底焊缝承压结构开展搅拌摩擦焊工艺技术研究,采用基于锁底结构搅拌工具设计的无匙孔回抽全焊透工艺技术,探究搅拌针长度、前进侧位置、坡口尺寸对4 mm 2A14铝合金锁底焊缝强度的影响。经过焊接试验验证...针对运载火箭共底贮箱独特的密封锁底焊缝承压结构开展搅拌摩擦焊工艺技术研究,采用基于锁底结构搅拌工具设计的无匙孔回抽全焊透工艺技术,探究搅拌针长度、前进侧位置、坡口尺寸对4 mm 2A14铝合金锁底焊缝强度的影响。经过焊接试验验证,针长度为-0.1~0.3 mm,前进侧位于锁底侧,焊接坡口设为0.5mm时为最优焊接工艺参数,焊缝强度高于熔焊焊缝强度。对锁底焊缝引钩(HOOK)缺陷进行研究,抑制了HOOK的产生,实现了搅拌摩擦焊方法在运载火箭承压锁底结构的首次应用与飞行验证,提高了焊接效率和质量,并实现整箱减重。展开更多
A novel ultrasonic vibration approach is introduced into a chloroprene rubber/aluminum friction couple for improving the static friction properties between rubber and metal.Compared to the test results without vibrati...A novel ultrasonic vibration approach is introduced into a chloroprene rubber/aluminum friction couple for improving the static friction properties between rubber and metal.Compared to the test results without vibrations,the static friction force of a chloroprene rubber/aluminum couple decreases observably,leading to the ultimate displacement of rubber.The values of the static friction force and ultimate displacement can be ultimately reduced to 23.1%and 50%of those without ultrasonic vibrations,respectively.展开更多
文摘针对运载火箭共底贮箱独特的密封锁底焊缝承压结构开展搅拌摩擦焊工艺技术研究,采用基于锁底结构搅拌工具设计的无匙孔回抽全焊透工艺技术,探究搅拌针长度、前进侧位置、坡口尺寸对4 mm 2A14铝合金锁底焊缝强度的影响。经过焊接试验验证,针长度为-0.1~0.3 mm,前进侧位于锁底侧,焊接坡口设为0.5mm时为最优焊接工艺参数,焊缝强度高于熔焊焊缝强度。对锁底焊缝引钩(HOOK)缺陷进行研究,抑制了HOOK的产生,实现了搅拌摩擦焊方法在运载火箭承压锁底结构的首次应用与飞行验证,提高了焊接效率和质量,并实现整箱减重。
基金Supported by the National Natural Science Foundation of China under Grant No 51075080.
文摘A novel ultrasonic vibration approach is introduced into a chloroprene rubber/aluminum friction couple for improving the static friction properties between rubber and metal.Compared to the test results without vibrations,the static friction force of a chloroprene rubber/aluminum couple decreases observably,leading to the ultimate displacement of rubber.The values of the static friction force and ultimate displacement can be ultimately reduced to 23.1%and 50%of those without ultrasonic vibrations,respectively.
