Structural Performance Analysis Of Auto Parts And Lightweight Design Of Key Parts

The car includes many parts which are the basis and important part of the automobile development.The structure performance of components affects the structure performance and use quality of vehicles.If the structure performance of parts is bad,it will cause a series problems of vibration,deformation and even cracking when using the car,which will not only reduce the evaluation of quality when people use the car,but also bring some security risks.Therefore,the structure performance of parts should be analyzed according to the relevant technical standards.In addition,due to the large number of components,the decrease of parts can also achieve the lightweight of car,which can do good to the enterprises' reducing costs and the rational use of resources.In the paper,the FEM models of four parts of vehicle are established,the process and requirements of FEM model are summarized.It analyses the structure performance of four parts according to the FEM model,summarizes the technical method of analysis to the structure performance of parts,and then evaluates objectively the result of analysis.The B column was selected as the research object to lightweight design using Thermoforming process,it has been lost 6.414 kg on the left and right sides.Building the side impact simulation model based on the relevant collision regulation,the side crashworthiness of the B column after lightweight is analyzed and verified,the result is that the crashworthiness of the B column has a certain increase.The main contents are as follows:1?The paper studies and summarizes the lightweight method of body structural member,introduces three common structural member lightweight methods like new material,optimal design and jointer,presents three common light-weight materials like high-strength steel,non-ferrous alloy material and plastic composite in details,discuses three lightweight design thoughts like the optimum structural design,structural layout design and optimum topological design,and summarizes technical features of laser welding of tailored blanks and TOX connection.The paper introduces finite element analysis software and the theory of analysis briefly.According to related enterprise standard and engineering experience,it divides the grid correctly and inspects the quality of grid,creates correct connection relationship,simulates spot welding and seam welding,distributes the material attribute to the connected model,established finite element model of front door,back door,the front hatch cover and seat and summarizes basic process and requirement of finite element modeling.The paper related regulation and standard for structural performance analysis of parts.Based on this,it analyses the structural performance of front door,front hatch cover,back door and seat such as modality,rigidity,concavity resistance,strength,etc.and evaluates the structural performance of these four parts objectively based on the analysis result.The evaluation mainly includes whether the mode of parts vibration is reasonable,whether the modality frequency avoids the sensitive area,whether the first order frequency reach the enterprise requirement,whether the torsion rigidity,bending rigidity and lateral rigidity could meet the structural performance requirement of enterprise,whether the concavity resistance of parts appearance could enhance the user's requirement on vehicle quality evaluation and whether the strength of part of parts could meet the provisions of related national standard.In addition,the paper refines the structural performance analysis process of parts.The paper makes lightweight design of B column of one SUV.Starting from optimizing production technology,the paper substitutes traditional cold press molding with hot press molding for B column.The material is enhanced from B340/590 DP to BR1500 HS.Finally,it reduces by 6.414 kg on the both sides of Column B and saves two sets of moulds for the production project.Later,according to related collision procedure,the paper erects side collision simulation platform and verifies the side collision resistance of vehicle after lightweight design.Through contrasts of invasion quantity and invasion velocity at the reference point in corresponding position of Column B dummy in two programs,the paper proves that the side collision resistance of vehicle after lightweight design is enhanced to some extent,which can guarantee the safety performance of vehicle and provide a certain reference for lightweight design of an enterprise.