Rolling Characteristics of Oval Caliber Roll

摘要

Recently, size free rolling and fine rolling have been highly required in bar and wire rolling process. Generally, a 4-roll rolling process is inferior to a 2- or 3-roll rolling process in area reduction, but superior in precise rolling capability. However there have been very few reports about the 4-roll rolling process. The deformation mechanism and characteristics of this process are thus not well understood. In this work, rolling characteristics are examined by means of experiments which are conducted in the process of high reduction during the first pass and finishing during the second pass. As a result of the experiments, the following findings are obtained. 1) Lateral reduction increases with an increase of area reduction. 2) Rolling load and rolling torque increase lineally with an increase of area reduction. 3) In the case of a bar 25 mm in diameter, after 2 passes, about 25 percent reduction in area is attained and in this case the roundness is 0.2 mm.4) With an increase of area reduction, the rolling load factor becomes almost constant.