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| Simulation Research on Effect of Mandrel Filling on Section Distortion and Wall Thickness Reduction of Rotary-Draw Bending of Copper-Titanium Composite Tube |
| ZHU Yingxia, WANG Yun, WAN Miaomiao, SHI Wei, TU Wenbin |
| (School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China) |
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Abstract In order to improve the precision of rotary-draw bending of copper-titanium composite tube, the effects of rigid mandrel parameters on section distortion and wall thickness thinning of the composite tube were studied, based on the established finite element model. The effects of rigid mandrel were compared with that of elastic mandrel. Research results show that: (1) with the increase of the extension amount of the rigid mandrel, the section distortion rate of the base\ covered tube of the bimetallic composite tube decreases gradually, and the wall thickness reduction rate increases gradually. The optimal extension amount of the mandrel is 7mm. (2) Compared with the coreless filling, the section distortion significantly reduces with the rigid mandrel filling, but the wall thickness thinning rate increases. When controlling the section distortion, the influence of the mandrel on the thinning rate of the composite tube should be considered, and the filling condition should be selected flexibly according to the actual production requirements and the tube size and structure. (3) When the elastic mandrel is filled, the section distortion rate along the bending direction is more uniform than that of the rigid mandrel. Compared with the elastic mandrel, the rigid mandrel can control the section distortion of the composite tube better, but the maximum difference is only 1.13%. The controlling effect of wall thickness reduction rate of elastic mandrel is better than that of rigid mandrel, and the maximum difference is 3.27%. Considering the cross section distortion and the wall thickness reduction, the filling effect of the elastic mandrel on the bimetallic composite tube is better.
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2020, 
