Sector-shaped section of continuous casting machine for heavy reduction of solidified terminal of continuously cast slab and heavy reduction method thereof

Abstract

The present invention provides a sector-shaped section of a continuous casting machine for heavy reduction of a solidified terminal of a continuously cast slab and a heavy reduction method. The sector-shaped section of a continuous casting machine comprises an upper frame, a lower frame, an upper driving roller, a lower driving roller, a left driven roller set, a right driven roller set, a screw-down gear and clamping cylinders which are positioned on the sector-shaped section; the clamping cylinders are used for clamping the upper frame and the lower frame and keeping the upper frame and the lower frame at a set interval; the upper driving roller is connected with the screw-down gear; the upper driving roller is connected to the upper frame through a bearing base; the lower driving roller is connected to the lower frame through a bearing base; the left driven roller set and the right driven roller set, are respectively positioned on two sides of the driving rollers; the left driven roller set is used for clamping the cast slab before reduction; the right driven roller set is used for clamping the cast slab after reduction; and the diameter ratio of the driving rollers to the driven rollers is 1.1:1-2:1. The deformation permeability of the present invention is increased, equivalent to the deformation of one rolling pass of a two-roller mill with a relatively large roller diameter, which facilitates improvement on the looseness and segregation of the center area of the continuously cast slab.

We claim: 
     
         1 . A sector-shaped section of a continuous casting machine for heavy reduction of a solidified terminal of a continuously cast slab, comprising an upper frame, a lower frame, an upper driving roller, a lower driving roller, a left driven roller set, a right driven roller set, a screw-down gear and clamping cylinders which are positioned on the sector-shaped section of the continuous casting machine, characterized in that the clamping cylinders are used for clamping the upper frame and the lower frame and keeping the upper frame and the lower frame at a set interval; the upper driving roller is connected with the screw-down gear; the upper driving roller is connected to the upper frame through an upper bearing base; the lower driving roller is connected to the lower frame through a lower bearing base; the left driven roller set and the right driven roller set are respectively positioned on two sides of the driving rollers; the left driven roller set is used for clamping the cast slab before reduction; the right driven roller set is used for clamping the cast slab after reduction; and the diameter ratio of the driving rollers to the driven rollers is 1.1:1-2:1. 
     
     
         2 . The sector-shaped section of a continuous casting machine for heavy reduction of a solidified terminal of a continuously cast slab according to  claim 1 , wherein the opening degrees of the right driven roller set and the driving rollers are identical with the thickness of the cast slab after reduction. 
     
     
         3 . The sector-shaped section of a continuous casting machine for heavy reduction of a solidified terminal of a continuously cast slab according to  claim 2 , wherein the opening degree of the left driven roller set is identical with the thickness of the cast slab before reduction. 
     
     
         4 . The sector-shaped section of a continuous casting machine for heavy reduction of a solidified terminal of a continuously cast slab according to  claim 3 , wherein the driving rollers are integrated and manufactured through an integral forming process. 
     
     
         5 . A method for heavy reduction of a solidified terminal of a continuously cast slab, characterized by comprising the following steps:
 (1) applying a certain pressure to the upper frame via the clamping cylinders such that the opening degree of the left driven roller set is identical with the thickness of the cast slab before reduction, and clamping the cast slab before reduction via the clamping cylinders;   (2) setting the rolling reduction to 5-20 mm, operating the screw-down gear to drive the driving rollers to apply heavy reduction onto the cast slab and to deform the cast slab;   (3) adjusting the right driven roller set such that the opening degree thereof equals the interval between the upper and lower driving rollers, and clamping the cast slab after reduction by the right driven roller set.