Development And Research On Glass Fiber Composite Tailgate Of An Electrically-powered Vehicle

The invention of the automobile has changed people’s way of transportation and gradually integrated into our life,even become an indispensable part as “ family members”.All industries cannot lack cars directly or indirectly.The subsidy policy introduced by the government has promoted people’s enthusiasm for buying cars.These factors have contributed to the prosperity of the automobile industry.However,the contradiction between the automobile and the increasingly stricter environmental protection requirements all over the word has become increasingly prominent.At present,all automobile enterprises have been striving for the reduction of the weight of automobile,and applying composite materials in the closures system of automobile has become one of the most effective means of automobile lightweight design.This paper mainly studies the characteristics of glass fiber composites,completes the structural design,the key process and manufacturing technology,and realizes the application in automobile tailgate.The main research content includes:(1)By comparing and analyzing the development trend of tail gate at home and abroad,mastering the production process and the machining process of composite materials,studying and concluding the key factors affecting the performance of composite materials,and comprehensively considering the service conditions,manufacturing process,performance indicators and cost of tail gate,it is finally determined that the material of inner plate of tail gate module is 40% PP long glass fiber reinforced plastic and the material of outer plate is PP-T30 as the tail gate module material of this research subject,both of them are produced and processed by granular injection molding process.(2)The traditional sheet metal tailgate and composite tailgate have been systematically compared and analyzed in terms of structural design,connection mode and manufacturing process.Taking the design and development process of composite tailgate as the main line,the modular design and integrated assembly of composite tailgate are realized through the determination of surface A of tailgate shape,the layout of key accessories and the design of key section surface,and the design results are verified by motion simulation.By summarizing the key factors affecting the service performance,user sensory quality and service life of the tailgate system,and completing the replacement of the original metal structure tailgate assembly with composite tailgate module finally,finally the lightweight goal of reducing weight by2.46 kg and 32.4% is achieved.(3)CAE performance index analysis and structural optimization of composite tailgate have been carried out.According to the decomposition of the vehicle performance requirements,the performance analysis indexes of the tailgate system are obtained,and then the performance simulation analysis is carried out by using the finite element analysis.Finally,the structure is optimized and designed for the area with poor analysis results by concentrating on the structural optimization of the weak area in the middle of the license plate,finding out the root causes,pointing out the optimization direction and improvement measures,and replacing the materials of the inner and outer plates of the composite tailgate with better performance.According to the topological optimization analysis,even if the density changes due to the replacement of materials,the composite tailgate module with unchanged quality and satisfactory performance will be maintained.(4)The vehicle manufacturing and test verification stage is the assessment and acceptance of the data design stage.Verify the feasibility of part design in production process and assembly through vehicle construction,analyze the rationality of indicators and the reliability of design through test verification,and summarize experience and lessons for subsequent project development.Only in this way can we ensure the qualified,safe and reliable vehicles on the road.