Back-up roll device and method for conducting corner deformation on chamfered continuous casting slab

Abstract

A back-up roll device and method for conducting corner deformation on a chamfered continuous casting slab. The back-up roll device includes back-up rolls with -angle bevels, movable bearing seats, bearing seat moving rails, bearing seat motion holding mechanisms and inner arc or outer arc frames of a casting machine. The back-up rolls are arranged on the inner and/or outer arc frames of the horizontal segment of the casting machine. Support surfaces of the back-up rolls make contact with and squeeze smaller obtuse angles adjacent to the wide face of the inner or outer arc on the chamfered continuous casting slab, and therefore each smaller obtuse angle is squeezed into two larger obtuse angles. The back-up roll device and method for conducting corner deformation on the chamfered casting slab can achieve the purposes of eliminating edge slivers.

Claims

1. A back-up roll device for conducting corner deformation on a chamfered continuous casting slab, wherein the chamfered continuous casting slab is provided with two to four original chamfered bevels, and each original chamfered bevel has an obtuse angle on a wide face of the continuous casting slab, wherein, the back-up roll device comprises back-up rolls with -angle bevels, movable bearing seats, bearing seat moving rails, bearing seat motion holding mechanisms, and inner arc or outer arc frames of a casting machine; the back-up rolls with -angle bevels are arranged on the inner arc and/or outer arc frames of a horizontal segment of the casting machine, and support surfaces of the back-up rolls with -angle bevels make contact with and squeeze obtuse angles adjacent to the wide face of the inner or outer arc on the chamfered continuous casting slab, so that each obtuse angle is squeezed into two larger obtuse angles; displacement sensors for measuring working positions of the back-up rolls with -angle bevels are arranged in the holding mechanisms for moving the bearing seats.

2. The back-up roll device for conducting corner deformation on the chamfered continuous casting slab of claim 1, wherein the corner deformation completed by squeezing the continuous casting slab with the back-up roll device is: each original chamfered bevel is squeezed into two chamfered bevels, and a total length of L1+L2 of the two squeezed chamfered bevels is longer than a length S of the original chamfered bevel.

3. The back-up roll device for conducting corner deformation on the chamfered continuous casting slab of claim 1, wherein the angles formed between the support surfaces of the back-up rolls with -angle bevels and a horizontal plane (or the wide face of the casting slab) are 15-30.

4. The back-up roll device for conducting corner deformation on the chamfered continuous casting slab of claim 1, wherein a thickness of the chamfered continuous casting slab is 130-450 mm, an original chamfer angle is 25-45, and a length S of the original chamfered bevel is 30-85 mm; and a length L2 of the squeezed chamfered bevel is 10-50 mm, and a height H is 3-25 mm.

5. The back-up roll device for conducting corner deformation on the chamfered continuous casting slab of claim 1, wherein the support surfaces of the back-up rolls with -angle bevels are selected from one of the following conditions: a, bevels; b, curved surfaces; c, bevels and a plane; d, curved surfaces and a plane; in the conditions c and d, the height of plane parts of the support surfaces are kept consistent with that of a supporting plane of the casting slab supported by an inner arc or outer arc of a roll arrangement of the casting machine.

6. The back-up roll device for conducting corner deformation on the chamfered continuous casting slab of claim 1, wherein the bearing seat motion holding mechanisms, which are used for holding and moving the bearing seats, have a structure of hydraulically driving a piston rod or a structure of electrically driving a lead screw to rotate.

7. The back-up roll device for conducting corner deformation on the chamfered continuous casting slab of claim 1, wherein the bearing seat moving rails for moving the movable bearing seats are square or dovetailed.

8. The back-up roll device for conducting corner deformation on the chamfered continuous casting slab of claim 1, wherein the back-up rolls with -angle bevels are arranged on the position of a last back-up roll of a last horizontal segment of the casting machine, or hung over an outlet of a horizontal segment, or arranged on the position of any back-up roll of any horizontal segment.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic diagram of a back-up roll device for conducting corner deformation on a chamfered continuous casting slab;

(2) FIG. 2a is a partial enlarged schematic diagram before a corner of the chamfered continuous casting slab is deformed;

(3) FIG. 2b is a partial enlarged schematic diagram after a corner of the chamfered continuous casting slab is deformed;

(4) FIG. 3 is a partial enlarged schematic diagram of conducting corner deformation on the chamfered continuous casting slab;

(5) FIG. 4 is a schematic diagram showing that back-up rolls with -angle bevels are only arranged on the inner arc of a casting machine;

(6) FIG. 5 is a schematic diagram showing that the back-up rolls with -angle bevels are only arranged on the outer arc of the casting machine;

(7) FIG. 6a is a schematic diagram showing that the support surface of a back-up roll with -angle bevel is a bevel;

(8) FIG. 6b is a schematic diagram showing that the support surface of a back-up roll with -angle bevel is a curved surface;

(9) FIG. 6c is a schematic diagram showing that the support surface of a back-up roll with -angle bevel is a bevel and a plane;

(10) FIG. 6d is a schematic diagram showing that the support surface of a back-up roll with -angle bevel is a curved surface and a plane;

(11) FIG. 7a is a schematic diagram showing that a bearing seat moving rail is square;

(12) FIG. 7b is a schematic diagram showing that a bearing seat moving rail is dovetailed;

(13) FIG. 8 is a schematic diagram showing that the back-up rolls with -angle bevels are hung over the outlet of a horizontal segment.

MAIN REFERENCES IN DRAWINGS

(14) 1 back-up roll with -angle bevel 2 movable bearing seat 3 bearing seat moving rail 4 bearing seat motion holding mechanism 5 inner or outer arc frame of horizontal segment of casting machine 6 chamfered continuous casting slab 7 smaller obtuse angle adjacent to the wide face of an inner or outer arc on the chamfered continuous casting slab 8-1, 8-2 two larger obtuse angles naturally squeezed from a smaller obtuse angle 9 conventional back-up roll of the horizontal segment of the casting machine 10 plane part of support surface of back-up roll with -angle bevel 11 original chamfered bevel 12-1, 12-2 two squeezed chamfered bevels angles between the support surfaces of back-up rolls 1 with -angle bevels and the horizontal plane original angle of chamfered continuous casting slab S length of original chamfered bevel of chamfered continuous casting slab L1, L2 lengths of squeezed chamfered bevels of chamfered continuous casting slab H height of squeezed bevel of chamfered continuous casting slab

DETAILED DESCRIPTION OF THE EMBODIMENTS

(15) Specific embodiments of the present invention will be further described as follows according to the accompanying drawings.

(16) FIG. 1 shows a back-up roll device for conducting corner deformation on a chamfered continuous casting slab. The back-up roll device mainly includes back-up rolls 1 with -angle bevels, movable bearing seats 2, bearing seat moving rails 3, bearing seat motion holding mechanisms 4, and inner arc or outer arc frames 5 of a casting machine. Wherein, a pair of symmetrical back-up rolls 1 with -angle bevels is arranged on the movable bearing seats 2, the bearing seat moving rails 3 are arranged below the movable bearing seats 2, the bearing seat moving rails 3 are arranged on the inner arc or outer arc frames 5 of the horizontal segment of the casting machine, the bearing seat motion holding mechanisms 4 are connected with the movable bearing seats 2, and the movable bearing seats 2 are moved and positioned through the bearing seat motion holding mechanisms 4.

(17) Wherein, the angles formed between the support surfaces of the back-up rolls 1 with -angle bevels and the horizontal plane are 15-30. The support surfaces make contact with and squeeze smaller obtuse angles 7 adjacent to the wide face of the inner or outer arc on the chamfered continuous casting slab 6, so that each smaller obtuse angle 7 adjacent to the wide face of the inner arc or outer arc is squeezed into two larger obtuse angles 8-1 and 8-2, the length L2 of the squeezed bevels is 10-50 mm, and the height H is 3-25 mm. FIG. 3 shows a partial enlarged schematic diagram of conducting corner deformation on the chamfered continuous casting slab.

(18) The support surfaces of the back-up rolls 1 with -angle bevels may be bevels as shown in FIG. 6a, curved surfaces as shown in FIG. 6b, a combination of bevels and a plane as shown in FIG. 6c or a combination of curved surfaces and a plane as shown in FIG. 6d. Wherein, under the conditions of FIG. 6c and FIG. 6d, the height of the plane parts 10 of the support surfaces of the back-up rolls 1 with -angle bevels are kept consistent with that of the supporting plane of the casting slab supported by the inner arc or outer arc of a roll arrangement of the casting machine.

(19) The back-up rolls 1 with -angle bevels may be simultaneously arranged on the inner arc and the outer arc of the casting machine, or only arranged on the inner arc or the outer arc of the casting machine. FIG. 4 and FIG. 5 respectively show a schematic diagram showing that back-up rolls with -angle bevels are only arranged on the inner arc of the casting machine and a schematic diagram showing that the back-up rolls with -angle bevels are only arranged on the outer arc of the casting machine.

(20) The bearing seat motion holding mechanisms 4 for holding and moving the bearing seats may have a structure of hydraulically driving a piston rod or a structure of electrically driving a lead screw to rotate.

(21) The bearing seat moving rails 3 for moving the movable bearing seats 2 may be square as shown in FIG. 7a, or dovetailed as shown in FIG. 7b.

(22) The back-up rolls 1 with -angle bevels are arranged on the position of the last back-up roll of the last horizontal segment of the casting machine as shown in FIG. 1, or hung over the outlet of the horizontal segment as shown in FIG. 8, or arranged on the position of any back-up roll of any horizontal segment and combined with a conventional back-up roll 9 of the horizontal segment of the casting machine.

(23) In the back-up roll device for conducting corner deformation on the chamfered continuous casting slab, the thickness of the chamfered continuous casting slab is 130-450 mm, the original chamfer angle is 25-45, and the length S of the original chamfered bevel is 30-85 mm.

(24) When the back-up roll device is used, the back-up rolls 1 with -angle bevels are arranged on the inner arc and/or outer arc frames 5 of the horizontal segment of the casting machine. Displacement sensors are arranged in the holding mechanisms 4 for moving the bearing seats, and the displacement sensors may be used for measuring the working positions of the back-up rolls 1 with -angle bevels. According to the width of the cross section of the continuous casting slab, the positions of the movable bearing seats 2 are adjusted through the bearing seat motion holding mechanisms 4, and then the positions of the back-up rolls 1 with -angle bevels are adjusted, so that the bevels of the back-up rolls are just supported on the corners of the four smaller obtuse angles 7 adjacent to the wide face of the inner or outer arc on the chamfered continuous casting slab 6.

(25) Thus, along with the drawing process, each smaller obtuse angle 7 is naturally squeezed into two larger obtuse angles 8-1 and 8-2. FIG. 2a shows a partial enlarged schematic diagram before a corner of the chamfered continuous casting slab is deformed, and FIG. 2b shows a partial enlarged schematic diagram after a corner of the chamfered continuous casting slab is deformed. The continuous casting slab in such corner shape may achieve the purposes of optimizing the corner shape of the casting slab and eliminating edge slivers of a plate under the condition that the transverse corner cracks are completely controlled and eliminated.