Abstract

Rolling back-up rolls require high fracture toughness, particularly in the shaft portion, and high-hardness in the sleeve portion. The rolls are classified into two types; one is an integrated type and the other is a shrink-fitted type consisting of a sleeve and a shaft. The shrink-fitted roll has several advantages, for example, suitable materials can be chosen and the shaft can be reused by replacing the damaged sleeve. However, during use if the residual permanent deflection occurs, the roll cannot be used anymore. In this paper, an elastic-contact finite element method FEM analysis is performed to explain the residual permanent deflection mechanism. It is found that the quasi-equilibrium stress zone with the residual displacement causes the permanent slippage in the axial direction. In a similar way, the interface creep in the circumferential direction can be also explained from the quasi-equilibrium stress zone with the residual displacement.

Highlights

  • The rolling rolls require the high toughness shafts to support large rolling load

  • Most of the rolls are classified into integrated type, but another type sleeve rolls are developed by shrink fitting the sleeve to the shaft as shown in Figure 1 [4,5]

  • The simulation and experimental results suggested that the residual deflection may be controlled by the friction coefficient, the frictional surface stress and the slip condition

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Summary

Introduction

The rolling rolls require the high toughness shafts to support large rolling load. the rolls require the high hardness surface to prevent spalling caused by the cyclic contact loading [1,2,3].Currently most of the rolls are classified into integrated type, but another type sleeve rolls are developed by shrink fitting the sleeve to the shaft as shown in Figure 1 [4,5]. The rolling rolls require the high toughness shafts to support large rolling load. The rolls require the high hardness surface to prevent spalling caused by the cyclic contact loading [1,2,3]. Most of the rolls are classified into integrated type, but another type sleeve rolls are developed by shrink fitting the sleeve to the shaft as shown in Figure 1 [4,5]. In this sleeve roll, 8, x FOR PEER. REVIEW suitable materials can be chosen independently for the shaft and the sleeve.

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