Effects of Forming Conditions on Strain Distribution and Small Cracks of Helical Rolled Tube

Takizawa, Hideo; Kimura, Toshio

doi:10.9773/sosei.47.404

Cited by 1 publication

(2 citation statements)

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“…The reduction of diameter proceeds gradually through repeated unbending in which the curvature decreases such that the tube shape conforms to the geometry of roller due to the contact, and bending in which the curvature increases to maintain the shape of closed cross section of the tube end after separation from the roller. Takizawa et al, 10) based on finite element analysis and experiment on helical rolling of tube, reported that the direction of bending deformation in the circumferential direction changes before and after contact with the roller, and that such deformation is a redundant deformation. In the present study, the similar unbending and bending deformations are repeated.…”

Section: Experimental and Simulation Methodsmentioning

confidence: 99%

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Effects of Forming Conditions on Wrinkling in Necking of Tube End

et al. 2011

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The effects of forming conditions on wrinkling in the neck of stainless-steel tubes were investigated using experiments and threedimensional finite element simulations. The materials used for this study were tubes designed for automotive exhaust parts. When the axial or radial forming pitch of the rollers is large, the outside of the tube is subjected to considerable compressive stress in the circumferential direction by contact with the rollers. Simultaneously, the inside of the tube is subjected to considerable tensile stress in the circumferential direction. Consequently, the tube is subjected to excessive localized forming, which causes the curvature to become uneven in the circumferential direction, thereby resulting in wrinkling. The number of contact points with the rollers was determined. Results show that the optimum forming conditions were easily determined to achieve short forming times and high dimensional accuracy.

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Section: Experimental and Simulation Methodsmentioning

confidence: 99%

“…The number of contacts with the rollers n c between the tube in an arbitrary r-z plane and the rollers is defined 11) as the parameter used to determine the optimum forming conditions that result in a short forming time and high dimensional accuracy. For this study, the n c is calculated using eq.…”

Section: Relation Between Roundness Of the Tube And Numbermentioning

confidence: 99%