Research Of Numerical Simulations And Experiments On Hot Forming Of Aluminium Alloy Sheet

With the increasing popularity of automobiles and the growing awareness of environmental protection among citizens,the majority of consumers have gradually moved toward the direction of lightweight and environmental protection.In order to achieve this goal,lightweight materials are now commonly used.Due to its lower density,higher strength,better plasticity,as well as weight reduction,energy saving,and better recyclability,aluminum alloy materials have become the first choice for achieving lightweight automotive targets.However,aluminum alloy materials have problems of poor formability at room temperature and deformation of heat treated parts after forming.In order to solve this problem,this paper proposes an emerging aluminum alloy hot forming process called hot forming-quenching integrated process,breviated as HFQ process,the process combines hot forming and heat treatment in the same work step.Under the guidance of the forming process,it not only solves the problem of aluminum alloys poor plasticity at room temperature and easy deformation of the heat-treated sample after forming,but also effectively reduces the springback of the formed part.In this paper,the deep-drawing forming performance of 6082 aluminum alloy plate is studied by cylindrical piece deep drawing experiment and finite element numerical simulation technology.The specific research contents are as follows:Firstly,taking 6082 aluminum alloy plate as the research object,conduct heat treatment test on 6082 aluminum alloy plate,study the microstructure and mechanical properties under different heat treatment conditions through the sample uniaxial tensile test and metallographic microstructure observation.Determine the state of the 6082 aluminum alloy sheet that meets the press forming requirements under the optimal heat treatment parameters.The optimal parameters of heat treatment are: solution temperature 540~580°C,solution time 80~100min,quench water temperature 50°C,delay time 5h,aging temperature 165°C,aging time 10 h.Then,the 6082 aluminum alloy plate cylindrical piece deep-drawing forming was used as a simulation platform to establish a finite element model of cylindrical piece deep drawing.The MSC.Marc finite element simulation software was used to discuss the stamping forming of aluminum alloy plate.The experimental design method was used to explore the effects of blank holder force,friction coefficient,initial sheet temperature,mold temperature,punching speed,and die corner on the deep drawing formability of the 6082 aluminum alloy plate.The maximum springback amount was used as the target of the assessment.The assessment is to optimize the parameters of the stamping results and obtain the optimal forming parameters: blank holder force 3KN,friction coefficient 0.05,initial sheet temperature 350°C,mold temperature 180°C,punching speed 150mm/s,die corners 18 mm.Finally,a deep-drawing forming experimental platform for cylindrical parts of aluminum alloy plates was set up.From two aspects of working dimensions and structure,the positive-molded drawing dies were designed and manufactured.The stress and strain of each part during the deep-drawing process of the cylindrical part and deep drawing defect are briefly analyzed.Under the guidance of the HFQ process,with reference to the optimal parameters of heat treatment and hot forming,the 6082 aluminum alloy plate is subjected to a cylindrical part using a press.The deep drawing experiment obtained a complete cylindrical deep drawing,indicating that the process route and the obtained experimental parameters are reliable.