Continuous-curvature convex roll for continuously casting bloom, and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-11298744-B2
Application number	US-201917271094-A
Country	US
Kind code	B2
Filing date	Aug 16, 2019
Priority date	Aug 31, 2018
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

Disclosed are a continuous-curvature convex roll for continuously casting a bloom, and a manufacturing method therefore. An outer contour curve of a working portion of a body of the continuous-curvature convex roll contains a first straight-line segment (AB), a first transition curve segment (BC), an intermediate straight-line segment (CD), a second transition curve segment (DE) and a second straight-line segment (EF). The BC, the AB, and the CD have continuous first-order derivatives, continuous second-order derivatives, and continuous curvatures, thus forming a first transition curve with a continuous curvature. The BC and the DE are mirror-symmetrical. The continuous-curvature convex roll can uniformly deform a blank cast in a deformation area, thereby reducing cracks. The transition curve of the convex roll can be reduced, thereby being capable of further reducing a rolling pressure and the withdrawal resistance.

First claim

What is claimed is:

1. A method of manufacturing a continuous curvature convex roll for a continuous casting bloom, wherein:
an outer profile curve of a working part of a roll body of the continuous curvature convex roll body is composed of a first straight line section (AB), a first transition curve section (BC), an intermediate straight line section (CD), a second transition curve section (DE), and a second straight line section (EF);
wherein the first transition curve section (BC), the first straight line section (AB), and the intermediate straight line section (CD) have first-order derivative continuity, second-order derivative continuity, and curvature continuity, forming a first transition curve having a continuous curvature;
wherein the second transition curve section (DE), the intermediate straight line section (CD) and the second straight line section (EF) have first-order derivative continuity, second-order derivative continuity, and curvature continuity, forming a second transition curve having a continuous curvature;
wherein the first transition curve (BC) and the second transition curve (DE) are mirror symmetrical;
wherein when manufacturing and processing the convex roll, a blank is first cast according to shape and size requirements of the convex roll, and then the working part of the roll body is formed by subjecting the blank to rotational processing along a central axis (O 1 O 2 ) of the convex roll according to a shape of the outer profile curve to form the continuous curvature convex roll;
alternatively, for an existing flat roll, a protuberance is first formed on the flat roll at a position corresponding to the working part of the roll body by resurfacing welding, and then the working part of the roll body is formed by subjecting the protuberance to rotational processing along a central axis (O 1 O 2 ) of the convex roll according to a shape of the outer profile curve to form the continuous curvature convex roll.

2. The method of manufacturing a continuous curvature convex roll for a continuous casting bloom according to claim 1 , wherein the method of forming the first and second transition curve sections having a continuous curvature is as follows:
establishing a coordinate system, wherein an origin of coordinates (0, 0), a central point (L/2, H) and an end point (L, 0) are set; generating a convex curve passing through the origin, central point and end point, wherein the origin and the end point meet second-order derivative continuity, the central point meets first-order derivative continuity, L is a sum of projection lengths of the first and second transition curves on the x axis, and H is a height of the protuberance of the convex roll;
wherein the convex curve is a curve that is axisymmetric about a vertical line passing through the central point, the first curve section (OA) is a left half of the curve, and the second curve section (AB) is a right half of the curve; and
wherein the first curve section (OA) serves as the first transition curve section; and the second curve section (AB) serves as the second transition curve section.

3. The method of manufacturing a continuous curvature convex roll for a continuous casting bloom according to claim 2 , wherein the convex curve is depicted by equation:

y
=

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6
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4
⁢
H

L
6

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x
6

+

1
⁢
9
⁢
2
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H

L
5

⁢

x
5

-

1
⁢
9
⁢
2
⁢
H

L
4

⁢

x
4

+

6
⁢
4
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H

L
3

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x
3

.

4. A continuous curvature convex roll for a continuous casting bloom, wherein:
an outer profile curve of a working part of a roll body of the continuous curvature convex roll body is composed of a first straight line section (AB), a first transition curve section (BC), an intermediate straight line section (CD), a second transition curve section (DE), and a second straight line section (EF);
wherein the first transition curve section (BC), the first straight line section (AB), and the intermediate straight line section (CD) have first-order derivative continuity, second-order derivative continuity, and curvature continuity, forming a first transition curve having a continuous curvature;
wherein the second transition curve section (DE), the intermediate straight line section (CD) and the second straight line section (EF) have first-order derivative continuity, second-order derivative continuity, and curvature continuity, forming a second transition curve having a continuous curvature;
wherein the first transition curve (BC) and the second transition curve (DE) are mirror symmetrical.

5. The continuous curvature convex roll for a continuous casting bloom according to claim 4 , wherein
in a coordinate system, an origin of coordinates (0, 0), a central point (L/2, H) and an end point (L, 0) are set; and a convex curve passes through the origin, central point and end point, wherein the origin and the end point meet second-order derivative continuity, the central point meets first-order derivative continuity, L is a sum of projection lengths of the first and second transition curves on the x axis, and H is a height of the protuberance of the convex roll;
wherein the convex curve is a curve that is axisymmetric about a vertical line passing through the central point, the first curve section (OA) is a left half of the curve, and the second curve section (AB) is a right half of the curve; and
wherein the first transition curve section is configured according to the first curve section (OA); and the second transition curve section is configured according to the second curve section (AB).

6. The continuous curvature convex roll for a continuous casting bloom according to claim 5 , wherein
the convex curve is depicted by equat

Assignees

• Baoshan Iron & Steel

Inventors

• Xu Rongjun
• Liu Junjiang
• Wan Genjie
• Li Chengbin
• Liu Xiangchun
• Meng Qingyu

Classifications

• B21B1/46 Primary

  for rolling metal immediately subsequent to continuous casting (metal-rolling stands B21B13/22; continuous casting B22D11/00, e.g. into moulds with rolls B22D11/06) · CPC title

• B22D11/1206 Primary

  for plastic shaping of strands (rolling mills B21B1/46) · CPC title

• B22D11/1287 Primary

  Rolls; Lubricating, cooling or heating rolls while in use · CPC title

• B22D11/16

  Controlling or regulating processes or operations · CPC title