| With the increasing demand and production of automobile in our country,the requirements for assembly technology are becoming much more higher.The main function of hub bolt which is very important connection parts in the car is to keep the wheel assembly on the axle,and wheels bear the vertical load of the vehicle,the lateral force,driving torque,braking torque and all kinds of stresses which generated in motion.The failure of bolted joints will lead to very serious consequences,causing not only significant property damage,but also the tragedy of casualties.Combined with production practice,taking the wheel bolts and flange hub as the object of study,this paper aims at developing a kind of automatic hub bolt installation equipment with high efficiency and quality,and applying it to automobile front axle assembly line.Not only can it reduce the labor intensity but improve the assembly precision and production efficiency.Firstly,after analyzing the background and significance of the research,analysis and research are conducted based on the assembly demands and the workpiece characteristics,then the basic parameters and implementation of equipment can be ensured.And on this basis the relevant structure is developed.Taking into account the complexity of force changes in the process of knurled joining press,this paper carries out a detailed analysis of press-fit force.Firstly theoretical calculation of pressing force maximum is conducted using approximation methods and formula method,with numerical simulation results by finite element software ABAQUS as a reference.Secondly combining software HYPERMESH and ABAQUS for numerical simulation in the process of real process,this paper calculates out the maximum pressing force and verifies the simulation results based on the actual test results after the equipment are produced.Then,according to the calculation results of maximum pressing force,the required pressing force is determined and the appropriate servo electric cylinder is selected out.And then using virtual manufacturing technology,the structural design of compacting equipment isachieved in a virtual assembly environment of software CATIA.During the development process,the sub-structure of each part is developed by step,In the process of demand development in sequence,meanwhile taking into account the integrity of the equipment,convenience of operation,rationality of structure,with constant improvement and refinement,creating an engineering drawing in the final,therefore the device processing and assembly are accomplished.At the end of this thesis,on account of the seamless converting between DELMIA and CATIA,from the perspective of the virtual process simulation,it fulfills the simulation in the workpiece pressing process and the verification of the manufacturing process in the virtual environment,therefore guides the producing and manufacturing.Finally developed equipment has been put into production and use,operates in a stable way,with higher efficiency,of more convenience in operation.Besides,the press-fit quality is well guaranteed. |
PDF Full Text Request