PURPOSE: To support a pipe stock stably, and to roll it smoothly into an excellent shape, by setting the taper angles at the inlet and outlet sides of a roll shoe, the lengths of the inlet and outlet sides of roll shoe and the distance between the max. diam. part of roll shoe and the gorged part of rolling roll, by using the equations.
CONSTITUTION: The inlet-side taper angle γ and outlet-side taper angle δ of a roll shoe 22 are set by the equation I, and the inlet-side length Le and outlet- side length L0 of roll shoe 22 are set by the equation II. Next, the distance P from the gorged part of a rolling roll 21 to the max. diam. part of roll shoe 22 in the direction toward the inlet side of rolling, made as the plus direction, is set by the equation III. Further, the following signs are used in the equations, where; Di: outer diam. of pipe stock at inlet side, Df: outer diam. of pipe stock at outlet side, E: gorge of rolling roll 21, α: inlet-side face angle of roll 21, β: outlet-side face angle of roll 21, K: influence angle, influence of slant angle of roll 21 upon contact length between rolls.
KAGAWA MASAHIRO
TOGASHI FUSAO
KOBAYASHI TERUO
