The Effect of Swinging Ball Heads with Different Arrangements in Multi-Point Stretch-Forming Process

Materials

Zhuo Yi¹  Jian Xing²  Yan-yan Cheng³ 

[1] Dieless Forming Technology Center, Jilin University, Changchun 130025, China;Engineering Training Center, Northeast Electric Power University, Jilin 132012, China;School of Mechanical and Automotive Technology, Jilin Vocational College of Industry and Technology, Jilin 132013, China;

关键词: multi-point die;    stretch forming;    swinging ball head;    numerical simulation;   

DOI  :  10.3390/ma12030337

来源: DOAJ

【 摘 要 】

To improve the effect of multi-point stretch forming of sheet metal, it is proposed in this paper to replace a fixed ball head with a swinging ball head. According to the multi-point dies with different arrangements, this research establishes finite element models of the following stretch forming, i.e., fixed ball heads with conventional arrangement, swinging ball heads with conventional arrangement, swinging ball heads with declining staggered arrangement, and swinging ball heads with parallel staggered arrangement, and then numerical simulation is performed. The simulation results show that by replacing a fixed ball head with a swinging ball head, the surface indentation of the part formed was effectively suppressed, the stress and tension strain distribution of the part formed was improved, and the forming quality was improved; the thickness of the elastic pad was reduced, the springback was reduced and the forming accuracy was improved; and when the ball head was applied to a multi-point die with staggered arrangement, a better forming result was achieved, where the best forming result was achieved in combining the swinging ball heads with the multi-point die with a parallel staggered arrangement. Forming experiments were carried out, and the experimental results were consistent with the trend of numerical simulation results, which verified the correctness of the numerical simulation.

【 授权许可】

Unknown