Study on the Residual Deflection of Large Sleeved Back up Rolls : 5th Report, Analysis on the Machanism of the Deflection and the Efficacy of the Counter-measure of the Residual Deflection about Actual Rolls

Quasi-Equilibrium Stress Zone with Residual Displacement Causing Permanent Slippage in Shrink-Fitted Sleeve Rolls

“…Figure 4 shows the obtained residual deflection after removing load W = 294 kN. In Figure 4, the experimental results by Shimoda et al [6][7][8][9]. With µ = 0.2 are also plotted.…”

“…Therefore, there are some advantages over integrated type. Figure 1 shows the sleeve constructed roll previously studied [6][7][8][9]. The sleeve was assembled The rolling rolls also require the straightness roll axis center within 0.02 mm error at the end of shaft.…”

“…Therefore, if a permanent residual roll deflection occurs during the operation, the sleeve constructed rolls cannot be used anymore. In the previous study [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], the residual deflection was investigated experimentally for small rolls. However, the residual deflection was not compared with the deflection due to the standard load and therefore the deflection mechanisms has not been sufficiently clarified.…”

“…The sleeve was assembled to the shaft by shrinkage fitting. Then, the residual deflection was studied experimentally by Shimoda et al [6][7][8][9]. The ratio of the sleeve thickness to the shaft diameter is slightly larger than the actual ratio.…”

“…The ratio of the sleeve thickness to the shaft diameter is slightly larger than the actual ratio. And the ratio of the trunk length to the trunk diameter is larger than the actual ratio in order to clarify the influence of the length [9]. To measure deflection, a 980 kN hydraulic press machine was used by applying 3 point bending method.…”