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NUMERICAL SIMULATION FOR LASER BENDING OF SHEET METAL

Chinese Journal of Mechanical Engineering 1998年第4期11卷 30-35页

作者： Li Weimin Lu Xiuchun Liu Zhubai Li Shihua Mechanical Engineering Institute, Yanshan University Yanshan Univ China

The new flexible forming technique of sheet metal laser bending process is numerically simulated by using finite element method of large elastic plastic deformation. The temperature fields and stress strain distribution in deformation area are calculated, forming process is described and relationship between bend angle and width of sheet is discussed. It is shown that the calculated values are in good accordance with the experiments.

关键词： Laser bending flexible forming Numerical siumlation

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Multi-Point forming Technology for Sheet Metal

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厦门大学学报（自然科学版） 2002年第S1期41卷 17-页

作者： LI Ming-zhe, CAI Zhong-yi, SUI Zhen, YAN Qing-guang (Roll Forging Institute, Jilin University of Technology, Changchun 130025, China)

Multi-point forming (MPF) is an advanced manufacturing technology for three-dimensional sheet metal parts. In this paper, the MPF integrated system is described that can form a variety of part shapes without the need for solid dies, and given only geometry and material information about the desired part. The central component of this system is a pair of matrices of punches, and the desired discrete die surface is constructed by changing the positions of punches though the CAD and control system. The basic MPF process is introduced and the typical application examples show the applicability of the MPF technology. Wrinkle and dimple are the major forming defects in MPF process, numerical simulation is a feasible way to predict forming defects in MPF. In conventional stamping, the mode to form sheet metal with blankholder is an effective way to suppress wrinkling; the same is true in MPF. A MPF press with flexible blankholder was developed, and the forming results indicated the forming stability of this technique. Based on the flexibility of MPF, varying deformation path MPF and sectional MPF were explored that cannot be realized in conventional stamping. By controlling each punch in real-time, a sheet part can be manufactured along a specific forming path. When the path of deformation in MPF is designed properly, forming defects will be avoided completely and lager deformation is achieved. A work piece can be formed section by section though the sectional MPF, and this technique makes it possible to manufacture large size parts in a small MPF press. Some critical experiments were performed that confirmed the validity of two special MPF techniques.

关键词： sheet metal multi-point forming flexible forming forming path wrinkling forming defects

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