The Research Of Lightweight Of Automobile Seat Fixed Armrest

With the increasingly tense energy and growing environmental pollutionexhausted by Vehicle emissions,Vehicle weight reduction has become a hot spot ofthe automobile manufacturing enterprise technology innovations. Take the fixedsteel armrest of a bus as prototype, material and structural lightweight optimizeddesigns are chosen and the forming process is also discussed.On the basis of Al-4.5%Cu-0.7%Mn and Al-8Cu-0.7%Mn alloys are selectedas a lightweight alternative materials in this paper after a comprehensive analysisof literatures.After comparing with different amounts of mixed Re on themicrostructure, mechanical performance and casting performance.The results showthat when the mixed rare earth amounts to0.4%, the microstructure of Al-4.5%Cu-0.7%Mn is the finest. and the mechanical properties of the alloy also achievesto peak.When the mixed rare earth amount to1.5%, the microstructure of Al-8%Cu-0.7%Mn is refined and the hardness of the alloy achieves to peak.But it isfound that the strengthening mechanisms of the two alloys are not the same.Whenthe amount of Re is less than1.0%, The fine grain strengthening is formed mainlythrough the deterioration, when mixed Re amounts to more than1.0%, the hardnessof the organization is improved mainly through the formation of compounds.To theinfluence of rare earth on the morphology and dendrite can be explained byinterface stability theory and the constitutional-supercooling theory.The study alsofind that high levels of copper and rare-earth are easy to generate Al2Cu compoundsand their segregations leading to the plasticity decreasing.Finally, a alloy with optimized casting and mechanical properties todie-casting production is designed, the alloy is casting by metal molds in order toexplore the feasibility of the alloy suitable for high pressure die casting.In addition, the structure of the armrest of the seat is optimized by Solidworkssoftware, and a set of die-casting mold is designed by Pro/E to replace the originalwelding process for the optimized structure.Maximum cross-section is chosen asthe parting, Side of the pulling mechanism is chosen, Overflow tanks are set up atthe end of the molten metal. The design has a certain significance topractices.Finally, The Cosmos software is used to simulate the static strength. The result shows that the maximum stresses and the maximum of displacements are allmeet the safety requirements when the armrest is in the loading.