Numerical Simulation on Interfacial Creep Generation for Shrink-fitted Bimetallic Roll

Abstract

The bimetallic work rolls are widely used in the roughing stands of hot rolling stand mills. The rolls are classified into two types; one is a single-solid type, and the other is a shrink-fitted assembled type consisting of a sleeve and a shaft. Regarding the assembled rolls, the interfacial creep sometimes appears between the shaft and the shrink-fitted sleeve. This interfacial creep means the relative displacement on the interface between the sleeve and the shaft. This creep phenomenon often causes damage to the roll such as shaft breakage due to fretting cracks. Although to clarify this creep mechanism is an important issue, experimental simulation is very difficult to be conducted. Since few studies are available, in this paper, the interfacial creep phenomenon is simulated by using the elastic finite element method (FEM) analysis. Here, the roll rotation is replaced by the road shift on the fixed roll surface. It is found that the interface creep can be explained as the accumulation of the relative circumferential displacement along the interface.

Fatigue failure risk evaluation of bimetallic rolls in four‐high hot rolling mills

“…To clarify the rolling stress near the HSS/DCI boundary, no residual stress was assumed in this study. Assume the following rolling conditions that can be regarded as the average values in present steelworks 8 : the work roll diameter with the length , the high chrome steel backup roll diameter of with the length , the width of the rolled steel , and the standard rolling force 8,9 . Then, the conclusions obtained can be summarized in the following way.…”

“…The width dimension is commonly used and is recognized as a typical condition by many roll makers and steel companies. The work roll as well as the backup roll is subjected to the total rolling force whose standard value is 8,9 . Then, the work roll is subjected to the average line force from the rolled steel.…”

Fatigue Failure Analysis for Bimetallic Work Roll in Hot Strip Mills

“…Rolling technology is developing and advancing further although seemingly mature. [ 1–13 ] Figure 1 shows the rolling roll in roughing stands of hot rolling stand mills. By replacing the conventional single‐material rolls, bimetallic work rolls are developed through improving wear resistance and heat crack resistance.…”