A thermal stress forming method for increasing bending angle and improving microstructure and properties

• Autorzy: Guo Yankuo , Shi Yongjun , Wang Xiaogang , Fan Kaijun , Wang Qin

Identyfikatory

DOI

10.1007/s43452-021-00339-8

• Języki publikacji: EN

Abstrakty

EN

Thermal stress forming (thermoforming) technology has good advantages in small-batch, complex surface, brittle, and hard material processing. A large bending angle is the main objective of thermal stress forming. However, the problem of small bending angle has always existed. Especially in the case of larger workpiece thickness (h ≥ 1 mm), the bending angle is smaller. To solve the aforementioned problems, a new method (end blocking method, EBM) is proposed. The bending angle and deformation mechanism of this method with different plate thickness and processing parameters are investigated. Finally, the microstructure and properties of the heating zone are observed. The results show that the new method (9.05 deg) can increase the bending angle by 37.71 times with the traditional method (0.24 deg). The reason is that the new method can form a large bending moment in the heating zone and increase the bending angle effectively. Moreover, the method can still achieve a large bending angle (the traditional method: 0.02 deg, the new method: 2.75 deg, increased by 137.5 times), when the plate is thick (h = 1.2 mm). The bending angle obtained by the new method increases with the increment in laser power or the decrement in scanning speed. By contrast, the change in laser diameter has minimal effect on bending angle. In addition, because the new method can produce large compressive stress in the heating zone, the compressive stress can effectively refine the grains and increase the microhardness by 1.22 times. Therefore, this method can effectively improve the microstructure and properties of the heating zone. This method only needs a simple baffle, and the whole process is simple and practical. The new method in this study uses the laser as the heat source and is also suitable for flame thermoforming and high-frequency induction thermoforming.

Słowa kluczowe

EN

thermal stress forming; end blocking method; large bending angle; grain refinement

PL

naprężenie termiczne; kąt gięcia; rozdrobnienie ziarna

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2022
• Tom: Vol. 22, no. 1
• Strony: art. no. e23, 2022
• Opis fizyczny: Bibliogr. 31 poz., fot., rys., wykr.

Twórcy

autor

Guo Yankuo

• College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

autor

Shi Yongjun

• College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

autor

Wang Xiaogang

• College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

autor

Fan Kaijun

• College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

autor

Wang Qin

• College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)