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An auxiliary thermal stress forming method for realizing large angle

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Abstract

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.

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Data availability

The results of the experimental tests are available upon request.

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Funding

The work presented in this paper was supported by the National Natural Science Foundation of China (No. 51175515), PetroChina Innovation Foundation (No. 2017D-5007–0307), and the Fundamental Research Funds for the Central Universities (No. 18CX05004A).

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, Qingdao University of Technology, No. 777, Jialingjiang Road, Huangdao District, Qingdao, 266520, China

    Yankuo Guo, Feng Guo & Shuyi Li

  2. College of Mechanical & Electronic Engineering, China University of Petroleum, Qingdao, 266580, Shandong, China

    Yongjun Shi

Authors
  1. Yankuo Guo
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  2. Yongjun Shi
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  3. Feng Guo
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  4. Shuyi Li
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Contributions

Yankuo Guo performed data acquisition and processing and wrote the article manuscript. Feng Guo conceived and developed the theory and supervised the findings of this work at all stages. Yongjun Shi and Shuyi Li discussed the results and contributed to the review of the final manuscript.

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Correspondence to Feng Guo.

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Guo, Y., Shi, Y., Guo, F. et al. An auxiliary thermal stress forming method for realizing large angle. Int J Adv Manuf Technol 121, 4847–4864 (2022). https://doi.org/10.1007/s00170-022-09659-2

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  • DOI: https://doi.org/10.1007/s00170-022-09659-2

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