Impact of bending dies with different friction forms on forming force and quality of tubes manufactured by free bending technology |
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| Institution: | 1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China;2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;3. Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China;4. Mechanical Engineering Department, Faculty of Engineering-Helwan, Helwan University, Cairo, Egypt;5. Nanjing Golden Dragon Bus Co., Ltd, Nanjing 210012, China |
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| Abstract: | In the 3D free bending forming system, the bending die can be designed either in a sliding type or rolling friction type. Bending die-based sliding friction type is often called normal bending dies; however, the bending dies-based rolling friction type includes bending die-based roller type and ball type in structure. In the current study, the impact of three bending dies on the forming force, and the bent tube quality was investigated. The obtained results showed that the tangential stresses and strains of the tubes formed by the bending die-based roller type were the smallest among the three bending dies. Besides, the spherical bearing force PU was reduced drastically after using the roller type and ball type compared to the sliding friction type. Moreover, the uniformity of the wall thickness distribution of the tubes formed by the roller type and ball type was better than those obtained from the sliding friction type. In addition, the cross-section distortion rate was reduced by 2.8% using the roller type, and 1.8% using ball-type compared to the sliding friction type. |
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| Keywords: | Bending die Cross-section distortion Rolling friction Sliding friction Spherical bearing force Wall thickness |
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