Two-step shear bending of tube with small bending radius for satisfying both space conservation and inner gas/liquid fluidity

Kuboki, Takashi; Kusuda, Daisuke; Kajikawa, Shohei; Noguchi, Takahiro; Adachi, Kazuaki

doi:10.1016/j.cirp.2019.04.059

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…Kuboki et al [3] presented a new shear bending method of tubes for controlling bending radius. The method consists of two steps using a pair of mandrels.…”

Section: Introductionmentioning

confidence: 99%

Differential flow velocities control method for push-bending of the thin-walled tube with a 0.9D bending radius by differential lubrication

Tao

Fan

et al. 2022

Int J Adv Manuf Technol

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The smaller the relative bending radius of the bent tube, the more difficult the tube blank is to be bent. In this paper, the push-bending process for the aluminum tube with a relative bending radius of 0.9D was analyzed through simulation. There was tangential tensile stress concentration occurring at the front endpoint of tube intrados, which increased the risk of cracking. That is because the bending tube's extrados moves less angular distance than its intrados by the uniform lubrication method, causing excessive deformation of the cross-section. Therefore, a differential lubrication method using the lubricant with a larger friction coefficient at intrados and the lubricant with a smaller friction coefficient at extrados was proposed to increase the angular velocity of the tube's extrados. It was found that the differential lubrication method helped avoid excessive thinning at the front endpoint of tube intrados through simulations. Furthermore, push-bending experiments of 5A02 aluminum alloy with a relative bending radius of 0.9D were carried out to investigate this effect. The experimental results showed that the differential lubrication method effectively avoided cracking, which agreed with the simulation results.

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“…Kuboki et al [3] presented a new shear bending method of tubes for controlling bending radius. The method consists of two steps using a pair of mandrels.…”

Section: Introductionmentioning

confidence: 99%