An auxiliary thermal stress forming method for realizing large angle

• Published in: International journal of advanced manufacturing technology 2022-08, Vol.121 (7-8), p.4847-4864
• Main Authors: Guo, Yankuo, Shi, Yongjun, Guo, Feng, Li, Shuyi
• Format: Article
• Language: English
• Subjects: CAE) and Design; Computer-Aided Engineering (CAD; Engineering; Industrial and Production Engineering; Mechanical Engineering; Media Management; Original Article
• ISSN: 0268-3768; 1433-3015
• DOI: 10.1007/s00170-022-09659-2

Thermal stress forming is an important method of bending with the advantages of no mold, high flexibility, and wide range of processed materials. It is the hot spot and the future trend of advanced processing method. However, thermal stress bending technology cannot achieve the effect of mechanical forming (large bending angle), which restricts the development of this technology. In order to solve this problem, an auxiliary thermal stress bending method (baffle moment method, BMM) is proposed. A coupled thermodynamic model of the method is developed through simulation, and the bending angle variation law and forming mechanism are investigated. The results show that the BMM can increase the bending angle by 78.75 times compared with the traditional method. The reason is that BMM can form a larger pressure and bending moment in the heating zone. The bending angle increases with the increase of laser power, displacement. The bending angle decreases with increasing scanning speed, laser diameter, plate thickness, and center distance. The difference between negative and positive bending moments on the increase of bending angle is small (0.09 deg), and the direction of bending moment plays a decisive role in the bending direction. This method requires only a simple baffle device and no complex tooling, which helps to reduce the cost and improve the forming efficiency.