Finite Element Simulation And Optimization Of Hydroforming For Automotive Crashbox

Hydraulic forming technology is widely used in automotive,aerospace and other fields.With the rapid development of science and technology,the environmental and energy requirements are also getting higher and higher.Therefore,this requires us to make important breakthroughs and improvements in the traditional technology to meet the requirements of the development of modern society.The advantages of hydroforming technology in practical applications are the advantages of reducing the quality of parts,improving the forming effect and simplifying the forming process.At this stage of hydraulic forming technology,is generally applied to the actual production process of the initial yield stage and post-phase plastic surgery.Although the forming quality is higher than the traditional method,it is easy to produce large folds in the initial yielding stage and difficult to be improved in the later stage of plastic forming.Secondly,the pressure value in the yielding stage can not be easily determined,so there are still Some practical applications problem.In this paper,the automobile energy-absorbing box is taken as the research object,and the numerical simulation research on the energy-forming process of the energy-absorbing box is carried out by using the finite element numerical simulation software.The effects of feed rate,internal pressure,shaping pressure and pressure increasing mode,and friction coefficient on the hydroforming process were discussed.Aiming at the problems that the buckling occurs easily in the yielding stage during the hydroforming process and it is difficult to adjust the flattening during the shaping process,this paper adopts the method of adding a part of hydraulic pressure in the tube during the mold clamping stage to make the tube fitting more closely to the mold at the clamping stage The distribution of materials,so that the thickness of the material more uniform,forming better.In this paper,we also optimize and analyze different parameters such as axial feed,plastic pressure,pressure increasing method and friction coefficient during the forming process and the path to achieve the best forming effect.The use of Dynaform software to simulate the hydroforming process of the energy-absorbing box can increase the overall forming effect to a great extent by increasing the pressure at the clamping stage.By analyzing and verifying the axial feeding,shaping pressure,as well as the way of raising pressure and the friction coefficient,the most reasonable route and parameter size of the automobile energy absorbing box during the hydroforming process are obtained.