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- 저자 : Ruixue Zhai (검색결과 2 건)
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Rui Ma,Chao Ma,Ruixue Zhai,Jun Zhao 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.5
The springback control method is usually based on surface compensation to make the shape of the springback consistent with the target. At present, it is mainly realized by theoretical calculation or numerical simulation, but the difference between material model and theoretical model leads to unstable compensation accuracy. In this paper, a compensation mechanism which based on the iterative principle of implicit equation is proposed from the point of view of mathematical analysis. The final shape of the part converges to the target shape by means of finite compensation with the iterative method. In this paper, the iterative compensation mechanism is applied to the free bending and stretch-bending processes under plane stress state, and the uniform curvature and variable curvature are compensated iteratively. The next iteration compensation profile is predicted according to the convergence of the iterative principle. Experimental results show that the iterative compensation method can predict the next compensation value, and the error is less than the target value after 2–3 iterations. The error convergence of the method studied in this project is directional and the convergence speed is fast. The compensation value can be quantitatively predicted, which has theoretical significance and application value for engineering design, mold repair and numerical simulation.
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Study on Hot Deformation Behavior and Bending Forging Process of 7075 Aluminum Alloy
Lulu Li,Rui Ma,Jun Zhao,Ruixue Zhai 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.5
7075 aluminum alloy forged elbow has a wide range of application, but its deformation law is very complex. Its forging process parameters are difficult to control, so it is becoming a difficulty in practical production. In this paper, aiming at the forging parameters of 7075 aluminum alloy, the thermal simulation compression tests with different deformation parameters were cleverly designed, and the optimal forming range of 7075 aluminum alloy was obtained by combining theoretical calculation, microstructure and simulation. The results showed that: 7075 aluminum alloy forming process parameters range was 350∘C≤T≤450∘C+0.01/s≤ε˙≤0.78/s, T = 400 °C + 0.78/s≤ε˙≤1.0/s(except 400 °C + 0.1/s). The optimum forging parameters were: forging temperature 420 °C, forging speed 10 mm/s.
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