Research And Manufacturing Of Aluminum Alloy Spot Welding Machine For Large Special Non-standard Assembly

Compared with traditional steel material, aluminum alloy material has more less density, higher specific strength and well corrosion resistance. Based on the above advantages, thin-wall aluminum alloy workpiece is widely used in automobile industry, aerospace field and so on, and those workpiece is used as skin for cars and space craft like rockets. As the skin of cars and space crafts always have great size with curve surface, traditional aluminum alloy spot welding machine can not meet the processing requirement of high efficiency, high precision and high quality. So a special non-standard assembly machine is needed for the workpiece with great size and curve surface.This thesis presents the background and the meaning of this subject to the social development. The importance and main work is summarized which is based on the analysis to the reviews of internal and external research and development situation of aluminum alloy spot welding machine.First, the overall scheme design of aluminum alloy spot welding machine is discussed. The main work of this design can be divided into below part:the welding gun, the static electrode assembly and the foundation. The overall scheme is based on the structure and size of the aluminum alloy workpiece.According to the overall structure proposed above, the installation way and working principle of moving electrode assembly and static electrode assembly have to be settled down. In order to ensure the accuracy of the electrode force, a new welding gun is designed which use servo motor as its power producer; the installation position of the electrode has to be well designed in order to insure the whole structure of servo gun with enough stiffness and strength. According to the characteristics of the track which the static electrode assembly follows, pin gear transmission scheme is put forward and the checking calculation of related parameters is done. The lifting assembly is added to the machine in order to help the installation and adjustment of the workpiece.When the above design work is finished, based on the platform of Pro/Engineer all the3D model of the components are created and then use the virtual assembling module and kinematics module to build the whole system, and check the structure. Finally, for the key components of the machine, use the FEA software ANSYS/Workbench to investigate in order to ensure the strength and the stiffness meet the requirements of spot wedlding.