Abstract
The ABAQUS finite element simulation software was used to simulate the flexible 3D multipoint stretch-bending (MPSB) forming process of aluminum profiles. The influence of bending angle on the section distortion was investigated. The results show that the type of rectangular section distortion during horizontal bending and vertical bending is different. The bulging rate and the depression rate increase with the increase in horizontal bending angles; when the vertical bending angle is less than 15°, the depression rate of the horizontally curved section is effectively reduced. When α is equal to 30°, β is less than 15° which can effectively reduce the depression rate caused by horizontal bending to the profile. When α is less than 30°, the depression rate which is caused by horizontal bending can be reduced through the vertical bending angle, with 5° than 15°; the vertical bending process changes the distortion pattern of the profile; the depression rate and the bulging rate increase with the increase of the vertical bending angle. Through the support vector regression and selecting the parameter group c = 1.5, g = 0.05, the distortion rate of different angles in the common range is further expanded, and the quality control curve is drawn by combining the test results and prediction results which determine the depression rate as 2%, 2.5%, and 3% processing boundary. Using this curve to predict the distortion rate of the profile is instructive in the actual processing.
Highlights
Due to the rapid development of the automobile and highspeed rail industry in recent years, people pay more and more attention to the lightweight design of the structure.is is because reducing the weight of cars and high-speed trains can reduce energy consumption and alleviate the growing energy crisis and reduce waste emissions [1,2,3]
L is the length of the profile, δpre is the value of prestretching, R is the horizontal bending radius, R1 is the vertical bending radius, α is the horizontal bending angle, r is the vertical bending radius, β is the vertical bending angle, L2 represents the length of the profile projected in the vertical plane, L1 is the projection length of the contact part between the profile and the multipoint dies in the vertical plane, and δpo is the value of poststretching
E depression rate after the rectangular profile completed poststretching is shown in Table 3, and the bulging rate is shown in Table 4. e results show that when the horizontal bending is completed, the depression rate and bulging rate of section have increased with the bending angle; when the vertical bending angle is less than 15°, the depression rate has
Summary
Due to the rapid development of the automobile and highspeed rail industry in recent years, people pay more and more attention to the lightweight design of the structure. Clausen et al used the finite element method to simulate the bending and forming process of the car bumper and conducted in-depth research on the section distortion and springback phenomenon [4]. Mathematical Problems in Engineering the prediction of the amount of springback in the threedimensional stretch-bending process of the profile [10], and Liang et al explored the forming of the profile in threedimensional stretch-bending [11]. In the process of three-dimensional stretch-bending, the profile is a light high-strength aluminum alloy with large deformation resistance and good plasticity. Exploring the variation law of cross-section distortion of aluminum profiles during three-dimensional stretch-bending has certain guiding significance for actual production [17,18,19]. Exploring the variation law of cross-section distortion of aluminum profiles during three-dimensional stretch-bending has certain guiding significance for actual production [17,18,19]. is paper investigates the influence of the bending angle of the profile on the cross-section distortion and the variation law
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call