Research On Skeleton Structure And Welding Fixture Design Of High-strength Steel Bus

According to statistics,the car’s curb weight is reduced by 10%,and the car’s fuel consumption will be reduced by 6%-8%.Therefore,vehicle development also regards vehicle weight as a key indicator.Usually,the car body material is mainly made of metal materials,and the whole body not only contributes to the strength demand of the vehicle,but also occupies a very large proportion in the weight of the whole vehicle,and the weight of the body-in-white can reach more than 30% of the weight of the whole vehicle.Therefore,the use of high-strength steel materials has an unparalleled advantage in solving the overweight problem of the body frame,especially in the passenger car industry.It is of great significance for the development of passenger car products to carry out the lightweight design of the bus body skeleton structure and solve the practical problems in the manufacturing process.This paper combines the development process of the new model,first analyzes the difference between the body frame design and the conventional model by using the high-strength steel material QStE700 TM,and explains in detail the advantages of using the structure to improve the structural strength or anti-corrosion ability of the whole vehicle skeleton.Calculate the weight reduction effect of the new structural design.Among them,the overall front wall skeleton is an innovative structural design,which proposes new fixture requirements for production requirements;while the large top frame and the side wall skeleton are rationalized,by changing the bending process of the large top beam to The multi-section profile splicing process eliminates the strength loss of the curved portion and enhances the strength of the entire large-top frame;the side wall is achieved by integrating the position of the side window column and the door column to realize the overlap of the position of the side column,thereby realizing the overall side column.The application not only simplifies the side frame and the weight reduction effect is obvious;the previous tailor welded structure is abandoned on the assembled structure of the whole vehicle,and the single column structure is adopted to realize the comprehensive anti-corrosion of the whole vehicle and the weight reduction effect is obvious.Based on the results of CAE simulation analysis,the weak link of the body frame is repaired and combined with the application of high-strength steel materials to achieve the weight reduction goal of the vehicle.Combined with the current process route of bus body white body production,the bottleneck problems encountered in the actual production of the structure are analyzed.In order to better solve these problems and meet the production requirements of new structures,a solution for designing and manufacturing new high-precision welding fixtures has been proposed.The design idea,implementation method and manufacturing process of the front wall skeleton assembly and the large top frame assembly welding fixture are elaborated.Through multiple rounds of debugging and matching,the practical problems of high-strength steel application on new models were solved,and the target with a skeleton accuracy of not less than 85% was achieved.Based on the results of three-coordinate detection,the research and development results were validated.