A New Rolling Model for Three-Roll Rolling Mills

For the quality of rolled products, a perfect surface quality and tight, close tolerances apart from defined mechanical properties are essential. One key condition is a perfect pass design in the rolling mill. The paper deals with the models for a pass design calculation as well as a calculation of roll force and power demands for the rolling mill. On modern bar and rod mill, different types of mill stands are used, with 2-roll, 3-roll, and 4-roll stands. For each of these stand types, a special model system is used for the calculation. Heat balance and temperature control by water cooling are the basis for thermomechanical rolling to achieve the desired mechanical properties of the material. Free size rolling and the compensation of the numerous influencing parameters on the product dimensions must be incorporated in a pass design.

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“…flat pass; h0L -h1L: eq. entry and exit height of section [9] The well-known solution acc. to Alexander [15] in Fig.…”

Section: Calculation For 2-roll Passesmentioning

confidence: 99%

Models for Rod and Bar Rolling Mills with 2‑roll, 3‑roll, and 4‑roll Stands

Mauk

Overhagen

2016

Berg Huettenmaenn Monatsh

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“…Nardini et al [3] described the general process and showed a reduced spreading characteristic of the 4RP by means of Finite Element calculations. Avellino et al [4] showed a control system for the 4RP rolling block, where the working roll diameter was calculated according to the rolling theory of the 3RP [5].…”

Section: Intr Introduction Oductionmentioning

confidence: 99%

A computational method for pass design of the four-roll rolling process for sizing of round sections

Overhagen¹

2021

Esaform 2021

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The four-roll rolling process (4RP) enables the further evolution of sizing processes in rolling mills for round sections. The well-known advantages of the three-roll process over the two-roll process can be further improved using the 4RP. The participation of four rolls in the deformation zone instead of three or two leads to a significant increase in deformation efficiency. The present work shows a pass design method for pass sequences in the four-roll rolling process. Here, three basic types of roll groove geometries are discussed: the flat groove, the non-opened single-radius groove, and a tangentially opened type of a single radius groove. Based on a predefined cross-sectional evolution, grooves are found numerically to satisfy two conditions, i.e., the cross section of the rolled section and the groove filling criterion. The equations of the equivalent pass method, together with a suitable model for lateral spread and the geometric equations of the groove are solved by nonlinear optimization to minimize the sectional and filling errors of a specific pass. Combined for several rolling passes, a complete pass design can be carried out for the reduction of a specified initial section to a final section. The presented results show, how a pass design method for the four-roll rolling process can be constructed. The newly developed model is implemented in a software solution for pass design and analysis of full section rolling mills. An exemplified pass design is discussed to show the possibilities and limitations of the new model.

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“…It is a rolling process in which material is shaped by three rolls in three directions, everyone of which is inclined to the others at 120 0 [1,2]. Three-roll rolling process has various advantages such as easy flow control, small space requirement, and comparatively uniform deformation, etc.…”

Section: Introductionmentioning

confidence: 99%

“…The restriction of the material imposed by the shape of caliber rolls in the three-roll rolling process is greater than that in the two-roll rolling process. The accuracy of the shape of products made by the three-roll rolling process is considered to be higher than that of the two-roll rolling process [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Symmetric and Asymmetric Three-roll Rolling Process

Pesin

Chukin

Pustovoytov

2015

MATEC Web of Conferences

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Abstract.A three-roll process is a significant technique in the production of wire rod, round bars and hexagonal profiles for structural applications. Better mechanical properties of wire rod, round bars and hexagonal profiles can be achieved due to large plastic deformation by the three-roll process. Asymmetric rolling is a novel technique characterised by a kinematic asymmetry linked to the difference in peripheral speed of the rolls, able to introduce additional shear strains through the bar thickness. In order to achieve this, asymmetrical three-roll rolling process was investigated to better control the deformation compared to the conventional three-roll rolling process in a stand with two three-roll calibers located very close to each other. Simulation of round-triangle-triangle pass rolling was performed. FEM simulations were carried out with using software DEFORM 3D. The influence of the friction coefficient and speed asymmetry on the shear strain and material flow was discussed. The results of simulation can be used to optimize the asymmetric three-roll rolling process to improve the mechanical properties of wire rod, round bars and hexagonal profiles.

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A New Rolling Model for Three-Roll Rolling Mills

Cited by 10 publications

References 3 publications

Models for Rod and Bar Rolling Mills with 2‑roll, 3‑roll, and 4‑roll Stands

Models for Rod and Bar Rolling Mills with 2‑roll, 3‑roll, and 4‑roll Stands

A computational method for pass design of the four-roll rolling process for sizing of round sections

Finite Element Analysis of Symmetric and Asymmetric Three-roll Rolling Process

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