5A06 多流道曲面散热结构 SPF 工艺数值模拟及验证

Aiming at the application requirements of aluminum alloy curved surface heat dissipation components, the superplastic forming (SPF) process of 5A06 aluminum alloy multi-channel curved surface structure was studied. Based on the high temperature uniaxial tensile test, the optimal SPF parameters of 5A06 aluminum alloy were determined. Through SPF simulation, the stress, strain, wall thickness change and macroscopic deformation characteristics of the plate during SPF process of multi-channel curved surface structure were analyzed. The structure of the formed part, process parameters and pressure loading path were optimized. The process test was carried out by using the simulation optimization parameters. Compared with the simulation results, the rationality of the parameters was verified. The results demonstrate that 5A06 aluminum alloy exhibits optimal superplasticity with 430 ℃ / 0. 01 s^-1, achieving the elongation of 185%. When the channel pressure is 1 MPa and the depth-width ratio of the formed part is 0. 25, the maximum thinning rate of the plate is about 20%, with uniform thickness distribution. Numerical simulation results agree well with experimental results, exhibiting the maximum relative error of 3. 07%. The optimized parameters were used to carry out the process test, and the 5A06 aluminum alloy multi-channel curved surface heat dissipation structural part with no visible appearance defects, excellent flow channel shape and high mechanical properties can be obtained.