Analysis And Numerical Simulation Of Hot Forging Process For Automobile Aluminum And Magnesium Alloys

Automobile engine bracket is an important automotive parts,it will work in support of the weight of the car engine so that the engine can run smoothly in the normal operation,so the automotive engine bracket parts forming accuracy and mechanical properties have more High demand.Hot forging forming one of the earliest plastic forming method.Hot forging not only plastic,non-ferrous metals and alloys of relatively low strength steel,carbon steel and other engineering materials,but also forming high strength and hardness of materials such as stainless steel,special structures,high-speed steel and heat-resistant steel,etc..However,during the hot forging process,because the blank must be heated to the corresponding hot forging temperature,the actual forging process often accompanied by serious oxidation,decarburization and other hot forming defects,seriously affecting the dimensional accuracy of parts and surface quality.General parts by hot forging after cutting to be machined to improve the dimensional accuracy of parts and surface quality.In this paper,the hot compression simulation experiment of AA6082 aluminum alloy was carried out on the hot forming simulation equipment Gleeble-3800 and the stress-strain curve of AA6082 aluminum alloy was obtained.The data of the experiment was then processed with the origin software and different strain rates Under the material stress-strain curve.Secondly,the relatively wide Arrhenius material model is selected,and the constitutive equation of AA6082 aluminum alloy material is obtained through theoretical calculation.Then based on Deform software platform,the AA6082 aluminum alloy automobile engine bracket hot forging forming process was numerically simulated,and the forming defects existing in the traditional process scheme were found through the test results.According to the theoretical analysis of the actual defect forming and the theory of metal flow in the plastic forming process.The structure of hot forging die of three kinds of automobile engine bracket parts is optimized and numerically simulated respectively.Finally,the forming billet size and processing parameters of the automobile engine support were optimized.The volume of the billet which can be reduced by 15% based on the original billet size was calculated,and the optimum technological parameters were determined by orthogonal test.When the working speed of the press is 85mm·s-1,the blank radius is 90 mm,the initial temperature of the blank is 420? and the friction coefficient is 0.35,the forming quality of the forging is better.The result provides a strong technical support for the production of the enterprise.