Bending thick-walled conical vessel sections on roll-bending machines

Kulikov, E. A.; Berliner, Yu. I.; Shevyakov, G. I.

doi:10.1007/bf01144174

Cited by 3 publications

(5 citation statements)

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“…So, in Eq. (19), B 1 will be equal to (1/R 1 ). Top roller position (U) for desired radius (R f ) at reference end For N th pass of multi-pass bending, loaded radius (R N ) corresponding to the relative residual radius (R fN ′) at reference end can be derived to the form (refer Eq.…”

Section: Top Roller Position (U) For Desired Radius At Reference End mentioning

confidence: 99%

“…Loaded radius at the reference and larger end blank edges (R, R L ) were predicted with Eq. (19) and (22) based on the effective centre distance between bottom rollers (a, a L ) and effective top roller positions (U, U L ) at that particular cross-section. Residual radius at the reference and larger end (R f , R fL ), after each pass, were measured by tracing the blank edges profiles.…”

Section: Multi-pass Bending Experimentsmentioning

confidence: 99%

“…Cone frustums are extensively used in metal fabrication industry. Kulikov et al [19] reported analytical model to determine the machine setting parameters, for bending of conical vessel section on four roller bending machine. Springback prediction model proposed was based on pure plastic bending without work hardening.…”

Section: Introductionmentioning

confidence: 99%

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Formulation of springback and machine setting parameters for multi-pass three-roller cone frustum bending with change of flexural modulus

2009

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Roller bending process can be used to plastically deform a sheet or plate to hollow shapes of constant (i.e. cylindrical, elliptical) or varying (i.e. cone frustum) cross sections. Cylindrical and conical shells are the basic components of vessels and structures used for the various engineering applications. Reported work discuss the formulation of springback and machine setting parameters for continuous multi-pass bending of cone frustum on threeroller bending machines with non-compatible (cylindrical) rollers. Effect of change of flexural modulus during the deformation on springback prediction is analyzed. Effect of plate initial radius, number of bending passes and step interval for two successive bend radii on the springback is presented. Analytical results of multi-pass cone frustum bending were verified with the cone frustum bending experiments and found to be in good agreement. Work reported is expected to improve the accuracy and productivity by facilitating the fabrication engineers.

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Section: Top Roller Position (U) For Desired Radius At Reference End mentioning

confidence: 99%

Section: Multi-pass Bending Experimentsmentioning

confidence: 99%

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Formulation of springback and machine setting parameters for multi-pass three-roller cone frustum bending with change of flexural modulus

2009

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“…Analytical models for the springback prediction for the roller bending/forming of plates for cylindrical bending were developed with the assumption of single pass bending only [1,2,3]. Very limited work has been reported out of the literature reviewed, on curve bending of the plates other than cylinder [4,5,6], whereas conical and elliptical structures has been extensively used in practice for the various structural applications. Conical bending process by compatible rollers has been analyzed considering geometry using FEA methods [7].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Analytical Models of Force Prediction during Dynamic Bending Stage for 3-Roller Conical Bending Process

Chudasama¹,

Raval

2014

AMR

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Conical bending process using three rollers with different configurations is a widely used process for manufacturing conical sections and shells in the industries. The process involves static as well dynamic stages. For optimum design of the machine, accurate analytical model of the force prediction is required for static as well dynamic bending stages. In this paper the analytical models considering three different stress conditions have been compared with the experimental results. The observations of the comparison have been reported. It is concluded that for higher bottom roller inclination, the shear stress has to be considered for evaluation of bending force whereas for lower bottom roller inclination it can be neglected.

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“…The bottom rollers are rotated in the reverse direction once the complete length of the plate is bent and then the plate is unloaded. Research related to V-bending as well as roll bending for springback prediction has been reported extensively [3,4,5,6,7]. Hua et al have extensively analyzed the 4-roll bending process considering various aspects like mechanics of the process, springback, internal and external moments, etc [8,9,1].…”

Section: Introductionmentioning

confidence: 99%

Development of Analytical Model for Dynamic Bending Force during Single Pass 3-roller Cone Frustum Bending Technique

Chudasama¹,

Raval²

2014

ujme

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3-roller conical bending process is one which is used for producing conical sections or cone frustums from metal plates for various industrial applications. The plates to be bent are cut for the required size and shape and then rolled between three cylindrical rollers. The plate is kept between one top roller and two bottom rollers. Than the top roller is lowered down and the plate gets bend. The rollers are rotated to get the roll bending of the plate. Final dimension of the cone frustum are achieved through setting appropriate machine setting parameters. An attempt is made in this paper to develop the analytical model for the prediction of the bending force during the stage of dynamic roll bending. During the roll bending of the plate there will be shear stresses along with the normal stresses. The analytical model has been developed considering these shear stresses. The model consists of various parameters like material parameters and geometrical parameters. Based on the analytical models derived, effects of some of the material parameters on dynamic bending force have been studied. In the development process complex mechanics involved in this process has been simplified so it will give insight of the process and will be helpful to the researchers and designers working in the area of metal forming, especially in roll bending process.

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Bending thick-walled conical vessel sections on roll-bending machines

Cited by 3 publications

References 0 publications

Formulation of springback and machine setting parameters for multi-pass three-roller cone frustum bending with change of flexural modulus

Formulation of springback and machine setting parameters for multi-pass three-roller cone frustum bending with change of flexural modulus

Comparison of Analytical Models of Force Prediction during Dynamic Bending Stage for 3-Roller Conical Bending Process

Development of Analytical Model for Dynamic Bending Force during Single Pass 3-roller Cone Frustum Bending Technique

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