Study On The Superplastic Deformation Of Domestic Supplied Aluminum Alloy

Superplastic forming with large deformation, small stress, easy to shape, short cycle and low cost etc,but the superplastic forming technology is difficult to a wide range of applications, in addition to the restriction of superplastic forming some bottleneck factors, there is a more important reason is the high requirement of superplastic forming on the material itself, most of the materials on the market at present it is difficult to meet their requirements.Therefore, the study on non ideal superplastic materials of superplastic deformation characteristics, master the rule of the superplastic, with low cost of superplastic forming parts of high quality, whether it is from the application of superplastic technology, forming parts of quality assurance or superplastic forming process and scale of the production plays an important role in promoting.In this paper by the tensile test method, high-temperature uniaxial tensile test of suppied 5A06 aluminum alloy and supplied 5A90 aluminum alloy are reached analyzed, in 375℃~500 ℃temperature range and 0.00025s-1~ 0.01s-1strain rate range.Test results show that the temperature and strain rate are main factors influence of elongation of supplied 5A06 aluminum alloy and supplied 5A90 aluminum alloy.when the strain rate is 0.005s-1 and temperature is 400℃, extension of 5A06 is the the best, is 188.9%. But for supplied 5A90 aluminum alloy, when the temperature is 400℃and strain rate is 0.005s-1, the best of supplied 5A09 aluminum alloy elongation rate is 193.6%. One-way based on two kinds of materials, co MParing the high temperature tensile test results, supplied 5A06 aluminum alloy superplastic performance is more excellent than supplied 5A90 aluminum alloy, so choose supplied 5A06 aluminum alloy as free bulging experiment and eventually forming materials.Through superplastic free bulging test of supplied 5A06 aluminum alloy, can be found that supplied 5A06 aluminum alloy at a temperature of 400℃and a strain rate of 0.005s-1, bubble up 72.49 mm, with good superplasticity, the maximum change rate of the thickness is 61%. In the free bulging, along with the increase of the bulging pressure, forming height gradually increased. When the bulging time to a certain time, bulging at the top of the variable thin the worst. This part is, the position of the free bulging process is the most easily broken.The free bulging numerical simulation results are co MPared with the experimental results found that MSC.MARC software in the simulation of superplastic forming process with reasonable accuracy. The simulation results can be used to guide the actual parts of superplastic forming process and die design.Different design schemes of positive and negative to bulge forming parts are researched and analyzed on forming ability and the distribution of wall thickness effect for aluminum alloy bowl shaped pieces of positive and negative bulging of the pre-forming die design,using MSC.MARC finite element simulation software. The better and more the reasonable design scheme is determined through continuous change design, change the preform die shape and size.