CN116000258B - Hole pattern manufacturing method for continuous casting round billet solidification tail end pressing - Google Patents
Hole pattern manufacturing method for continuous casting round billet solidification tail end pressing Download PDFInfo
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- CN116000258B CN116000258B CN202310049062.0A CN202310049062A CN116000258B CN 116000258 B CN116000258 B CN 116000258B CN 202310049062 A CN202310049062 A CN 202310049062A CN 116000258 B CN116000258 B CN 116000258B
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 122
- 238000003825 pressing Methods 0.000 title claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000007711 solidification Methods 0.000 title claims abstract description 16
- 230000008023 solidification Effects 0.000 title claims abstract description 16
- 230000009467 reduction Effects 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000007704 transition Effects 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims 1
- 230000000881 depressing effect Effects 0.000 abstract description 7
- 238000005299 abrasion Methods 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 description 10
- 238000005204 segregation Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The application discloses a hole pattern manufacturing method for continuous casting round billet solidification end depressing, which comprises the following steps: determining a first hole pattern shape parameter, a second hole pattern shape parameter and a third hole pattern shape parameter of the pressing device according to the number of the pressing rollers; calculating a first hole pattern curve of the first hole according to the initial radius of the continuous casting round billet, the first target radius reduction amount and the first hole pattern shape parameter; calculating a target radius of the continuous casting round billet based on the initial radius of the continuous casting round billet, the first target radius reduction amount and the preset second target radius reduction amount, and calculating a second hole pattern curve of the second hole according to the target radius of the continuous casting round billet, the initial radius of the continuous casting round billet and the second hole pattern shape parameter; calculating a third hole type curve of a third hole according to the target radius of the continuous casting round billet and the third hole type shape parameter; three hole patterns of the continuous casting machine pressing device are manufactured. The method helps to prevent the continuous casting round billet from being flanged and reduce the abrasion of the reduction rolls.
Description
Technical Field
The application relates to the technical field of metallurgical continuous casting equipment, in particular to a hole type manufacturing method for continuous casting round billet solidification tail end pressing.
Background
The center of the continuous casting round billet is easy to generate center segregation and center porosity, and the center segregation and center porosity of the continuous casting round billet can be effectively reduced by adopting the continuous casting round billet solidification end weight pressing technology, so that the center quality of the continuous casting round billet is improved. The continuous casting round billet solidification end heavy rolling technology needs to be completed by adopting a rolling device, wherein two rolling rollers or three rolling rollers in the rolling device are combined into a rolling hole type, and the deformation of the continuous casting round billet is directly influenced by the hole type of the rolling device. The reasonable depressing hole type can prevent the continuous casting round billet from producing flange and reduce the abrasion of the depressing roller.
In order to ensure the shape precision of the continuous casting round billet, prevent the generation of flanges, reduce the abrasion of the reduction rolls, and the reduction device of the solidification tail end of the continuous casting round billet needs to adopt a reasonable hole pattern. However, the existing roll shapes applied to slabs and square billets cannot be applied to continuous casting round billets, and meanwhile, the hole patterns adopted in rolling the continuous casting round billets do not meet the technological requirements of the continuous casting round billets solidification end weight pressing technology.
Disclosure of Invention
In view of this, the present application provides a hole pattern making method for continuous casting round billet solidification end pressing.
The application provides a hole pattern manufacturing method for continuous casting round billet solidification end pressing, which comprises the following steps:
determining the number of the reduction rolls of a reduction device of the continuous casting machine, and determining a first hole pattern shape parameter, a second hole pattern shape parameter and a third hole pattern shape parameter of the reduction device according to the number of the reduction rolls;
obtaining an initial radius of a continuous casting round billet and a first target radius reduction amount of the continuous casting round billet, and calculating a first hole pattern curve of a first hole according to the initial radius of the continuous casting round billet, the first target radius reduction amount and the first hole pattern shape parameter;
calculating a target radius of the continuous casting round billet based on the initial radius of the continuous casting round billet, the first target radius reduction amount and a preset second target radius reduction amount, and calculating a second hole pattern curve of a second hole according to the target radius of the continuous casting round billet, the initial radius of the continuous casting round billet and the second hole pattern shape parameter;
calculating a third hole pattern curve of a third hole according to the target radius of the continuous casting round billet and the third hole pattern shape parameter;
and manufacturing three hole patterns of the continuous casting machine pressing device according to the first hole pattern curve, the second hole pattern curve and the third hole pattern curve.
Optionally, the manufacturing three hole patterns of the continuous casting machine pressing device according to the first hole pattern curve, the second hole pattern curve and the third hole pattern curve comprises:
obtaining hole pattern arrangement data corresponding to the number of the pressing rollers;
and manufacturing three hole patterns of the continuous casting machine pressing device according to the hole pattern arrangement data, the first hole pattern curve, the second hole pattern curve and the third hole pattern curve.
Optionally, when the number of the pressing rollers is 3, the hole pattern arrangement data is 180-degree crossed arrangement between two adjacent hole patterns;
when the number of the reduction rolls is 2, the hole pattern arrangement data is a 90-degree crossed arrangement between two adjacent hole patterns.
Optionally, when the number of the pressing rollers is 3, the first hole-type curve is three sections of first parabolas with the same shape, each section of first parabolas corresponds to an angle of 120 °, and any section of first parabolas is expressed as y= - ((R-h)/(r+h) 2 )X 2 (R-h), wherein R represents the initial radius of the continuous casting round billet, h represents the first target radius reduction amount, X represents X-axis coordinate data, and Y represents Y-axis coordinate data;
when the number of the pressing rollers is 2, the first hole-type curve is two sections of second parabolas with the same shape, one section of the second parabolas forms an upper arc of the first hole-type curve, the other section of the second parabolas forms a lower arc of the first hole-type curve, and any section of the second parabolas is expressed as Y= - ((R-h)/(R+h) 2 )X 2 +(R-h)。
Optionally, when the number of the pressing rollers is 3, the second hole pattern curve is three sections of third parabolas with the same shape, the corresponding angle of each section of third parabolas is 120 degrees, and any section of third parabolas is expressed as Y= - (R1/R) 2 )X 2 +r1, wherein R1 represents a target radius of the continuous casting round billet, r1=r-h-a, a represents a preset second target radius reduction amount;
when the number of the pressing rollers is 2, the second hole pattern curve is formed by two sections of fourth parabolas with the same shape, one section of the fourth parabola forms the left arc of the second hole pattern curve, and the other section of the fourth parabola forms the first parabolaRight arc of two-hole curve, and any section of fourth parabola is expressed as Y= - (R1/R) 2 )X 2 +R1。
Optionally, when the number of the pressing rolls is 3, the third hole type curve is three sections of first circular arcs with the same shape, the corresponding angle of each section of first circular arc is 120 degrees, the radiuses of the three sections of first circular arcs are all target radiuses of the continuous casting round billet, the first circular arcs and the roll gaps are in smooth transition, and the three sections of first circular arcs form a circle taking the center of the continuous casting round billet as the origin of coordinates;
when the number of the reduction rolls is 2, the third hole type curve is two sections of second circular arcs with the same shape, one section of second circular arc forms an upper arc of the third hole type curve, the other section of second circular arc forms a lower arc of the third hole type curve, the radius of each section of second circular arc is the target radius of the continuous casting round billet, the second circular arcs and the roll gaps are in smooth transition, and the two sections of second circular arcs form a circle taking the center of the continuous casting round billet as the origin of coordinates.
Optionally, the size of the roll gap is 4mm-10mm.
Optionally, the initial radius of the continuous casting round billet is 140mm-175mm.
The prior pressing roller shape suitable for square billets and slabs does not meet the deformation requirement of the round section of the continuous casting round billets, and the prior hole patterns for rolled bars and pipes are not suitable for pressing the solidification tail end of the continuous casting round billets. By means of the technical scheme, the application provides a hole type manufacturing method of the continuous casting round billet solidification tail end pressing device, and the continuous casting round billet is pressed through the cooperation of three holes. Compared with the common elliptical hole type, the parabolic hole type continuous casting round billet has higher elongation, and can rapidly reduce the size of the continuous casting round billet to reach the target rolling reduction. The parabolic hole pattern is smoother than the straight hole pattern, the shape of the continuous casting round billet is closer to a round shape after being pressed down, and the smooth hole pattern curve reduces stress concentration. And finally, adopting a hole pattern close to a circle to ensure the roundness of the continuous casting round billet after pressing. The upper and lower pressing rollers or the left and right pressing rollers in the pressing device are combined into a pressing hole type, and the deformation of the continuous casting round billet is directly influenced by the hole type of the pressing device. The reasonable depressing hole type can prevent the continuous casting round billet from producing flange and reduce the abrasion of the depressing roller. The production cost is reduced, and the improvement effect of the continuous casting round billet solidification end pressing technology on center segregation and looseness is improved.
The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a schematic flow chart of a hole pattern manufacturing method under the condition of solidifying tail end of a continuous casting round billet, which is provided by the embodiment of the application;
FIG. 2 shows a three-roll hole pattern schematic provided in an embodiment of the present application;
fig. 3 shows a schematic diagram of a two-roll hole pattern provided in an embodiment of the present application.
Detailed Description
The present application will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
In this embodiment, a hole pattern manufacturing method for pressing the solidification end of a continuous casting round billet is provided, as shown in fig. 1, the method includes:
step 101, determining the number of the reduction rolls of a reduction device of the continuous casting machine, and determining a first hole pattern shape parameter, a second hole pattern shape parameter and a third hole pattern shape parameter of the reduction device according to the number of the reduction rolls.
And 103, calculating a target radius of the continuous casting round billet based on the initial radius of the continuous casting round billet, the first target radius reduction amount and a preset second target radius reduction amount, and calculating a second hole pattern curve of a second hole according to the target radius of the continuous casting round billet, the initial radius of the continuous casting round billet and the second hole pattern shape parameter.
And 104, calculating a third hole pattern curve of a third hole according to the target radius of the continuous casting round billet and the third hole pattern shape parameter.
When the number of the pressing rollers is 3, the first hole pattern curve is three sections of first parabolas with the same shape, the corresponding angle of each section of first parabolas is 120 degrees, the three sections of first parabolas form the first hole pattern curve, and any section of first parabolas is expressed as Y= - ((R-h)/(R+h) 2 )X 2 (R-h), wherein R represents the initial radius of the continuous casting round billet, h represents the first target radius reduction amount, X represents X-axis coordinate data, and Y represents Y-axis coordinate data; the second hole-type curve is formed by three sections of third parabolas with the same shape, the corresponding angle of each section of third parabola is 120 degrees, the three sections of third parabolas form the second hole-type curve, and any section of third parabolas is expressed as Y= - (R1/R) 2 )X 2 +r1, wherein R1 represents a target radius of the continuous casting round billet, r1=r-h-a, a represents a preset second target radius reduction amount; the third hole type curve is three sections of first circular arcs with the same shape, the corresponding angle of each section of first circular arc is 120 degrees, the radiuses of the three sections of first circular arcs are all target radiuses of the continuous casting round billet, the first circular arcs and the roll gaps are in smooth transition, and the three sections of first circular arcs form a circle taking the center of the continuous casting round billet as the origin of coordinates.
When the number of the pressing rollers is 2, the first hole-type curve is two sections of second parabolas with the same shape, one section of the second parabolas forms an upper arc of the first hole-type curve, the other section of the second parabolas forms a lower arc of the first hole-type curve, and any section of the second parabolas is expressed as Y= - ((R-h)/(R+h) 2 )X 2 ++ (R-h); the second hole type curve is two sections of fourth parabolas with the same shape, one section of the fourth parabola forms a left arc of the second hole type curve, and the other section of the fourth parabola forms a fourth arcThe parabola forms the right arc of the second hole type curve, and any section of the fourth parabola is expressed as Y= - (R1/R) 2 )X 2 +R1; when the number of the reduction rolls is 2, the third hole type curve is two sections of second circular arcs with the same shape, one section of second circular arc forms an upper arc of the third hole type curve, the other section of second circular arc forms a lower arc of the third hole type curve, the radius of each section of second circular arc is the target radius of the continuous casting round billet, the second circular arcs and the roll gaps are in smooth transition, and the two sections of second circular arcs form a circle taking the center of the continuous casting round billet as the origin of coordinates.
And 105, manufacturing three hole patterns of the continuous casting machine pressing device according to the first hole pattern curve, the second hole pattern curve and the third hole pattern curve.
Optionally, step 105 includes: obtaining hole pattern arrangement data corresponding to the number of the pressing rollers; and manufacturing three hole patterns of the continuous casting machine pressing device according to the hole pattern arrangement data, the first hole pattern curve, the second hole pattern curve and the third hole pattern curve. When the number of the pressing rollers is 3, the hole pattern arrangement data are arranged in a 180-degree crossed mode between two adjacent hole patterns; when the number of the reduction rolls is 2, the hole pattern arrangement data is a 90-degree crossed arrangement between two adjacent hole patterns.
In the embodiment of the application, the hole pattern system of the continuous casting machine pressing device comprises three hole patterns. The three holes are respectively a first hole type, a second hole type and a third hole type. When the pressing device is two rollers, two adjacent holes are arranged in a 90-degree crossed mode. When the pressing device is a three-roller, two adjacent hole patterns are arranged in a 180-degree crossed mode.
For the first hole type, when three-roller pressing is employed, as shown in fig. 2, schematic diagrams of the first hole type, the second hole type, and the third hole type are respectively from left to right. The first hole pattern curve is composed of three sections of parabolas, and the shapes of the three sections of parabolas are the same. Each segment of parabola corresponds to an angle of 120. The three parabolas together form a hole pattern. When two-roll reduction is employed, a schematic view of the first hole pattern, the second hole pattern, and the third hole pattern is shown from left to right as shown in fig. 3. The first hole type curve consists of two sections of parabolas, the two sections of parabolas have the same shape, and one section of parabola consists ofThe upper arc and the lower arc are formed by one section to form a hole pattern together. The hole pattern curve formula of the three-roller pressing device is the same as that of the two-roller pressing device. Taking the center of the continuous casting round billet as the origin of coordinates, when the first target radius reduction amount is h, any section of parabola of the first hole pattern is Y= - ((R-h)/(R+h) 2 )X 2 +(R-h)。
As shown in fig. 2 and 3, the first hole pattern curve is parabolic, and can be applied to two-roll reduction or three-roll reduction. The center of the continuous casting round billet is taken as a coordinate origin, the initial radius of the continuous casting round billet is R, the reduction amount of the first target radius is h, and the range of h is 3-5mm. Any section of parabola of the first hole type is Y= - ((R-h)/(R+h) 2 )X 2 ++ (R-h). Optionally, the initial radius of the continuous casting round billet is 140mm-175mm.
For the second hole pattern, when three-roller reduction is employed, the second hole pattern curve is composed of three parabolas, the three parabolas being identical in shape. Each segment of parabola corresponds to an angle of 120. The three parabolas together form a hole pattern. When two rollers are adopted for pressing down, the second hole pattern curve consists of two sections of parabolas, the shapes of the two sections of parabolas are the same, one section of parabolas forms a left arc, and the other section of parabolas forms a right arc, and the two sections of parabolas form a hole pattern together. The hole pattern curve formula of the three-roller pressing device is the same as that of the two-roller pressing device. Taking the center of a continuous casting round billet as a coordinate origin, wherein the target radius of the continuous casting round billet is R1, and any section of parabola of the hole pattern is Y= - (R1/R) 2 )X 2 +R1. R1=r-h-a, a is a preset second target radius reduction, a ranges from 2 to 3mm, and h ranges from 3 to 5mm.
As shown in fig. 2 and 3, the second hole pattern curve is parabolic, and can be applied to two-roll pressing or three-roll pressing. And taking the center of the continuous casting round billet as a coordinate origin, wherein the target radius of the continuous casting round billet expected to be formed after the continuous casting round billet is pressed down by the second hole type is R1. Taking the center of a continuous casting round billet as a coordinate origin, wherein the parabolic curves of the second hole patterns corresponding to the two-roll pressing or the three-roll pressing are Y= - (R1/R) 2 )X 2 +R1。
For the third hole type, when three-roller pressing is adopted, the third hole type curve is three sections of first circular arcs with the same shape, and the center of the first circular arcs is the same as the center of the continuous casting round billet. The corresponding angle of each section of arc is 120 degrees, the three sections of first arcs form a circle with the center of the continuous casting round billet as the origin of coordinates, and the radius of the circle is the target radius R1 of the continuous casting round billet. When two rolls are adopted for pressing down, the third hole pattern curve consists of two sections of second circular arcs taking the center of the continuous casting round billet as the center of a circle, the second circular arcs and the roll gaps are in smooth transition, the hole pattern of the continuous casting round billet is a circle, the target radius R1 of the continuous casting round billet is formed by the two sections of second circular arcs, the center of the continuous casting round billet is a circle with the origin of coordinates, and the radius of the circle is the target radius R1 of the continuous casting round billet. The size of the roll gap is 4mm-10mm. The third hole type plays a role in maintaining the shape of the round billet.
By applying the technical scheme of the embodiment, the continuous casting round billet is pressed down by the cooperation of the three holes. Compared with the common elliptical hole type, the parabolic hole type continuous casting round billet in the patent has higher elongation, and can rapidly reduce the size of the continuous casting round billet to reach the target rolling reduction. The parabolic hole pattern is smoother than the straight hole pattern, the shape of the continuous casting round billet is closer to a round shape after being pressed down, and the smooth hole pattern curve reduces stress concentration. And finally, adopting a round hole shape to ensure the roundness of the continuous casting round billet after pressing. The upper and lower pressing rollers or the left and right pressing rollers in the pressing device are combined into a pressing hole type, and the deformation of the continuous casting round billet is directly influenced by the hole type of the pressing device. The reasonable depressing hole type can prevent the continuous casting round billet from producing flange and reduce the abrasion of the depressing roller. The production cost is reduced, and the improvement effect of the continuous casting round billet solidification end pressing technology on center segregation and looseness is improved.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (5)
1. A hole pattern manufacturing method for pressing down the solidification tail end of a continuous casting round billet, which is characterized by comprising the following steps:
determining the number of the reduction rolls of a reduction device of the continuous casting machine, and determining a first hole pattern shape parameter, a second hole pattern shape parameter and a third hole pattern shape parameter of the reduction device according to the number of the reduction rolls;
obtaining an initial radius of a continuous casting round billet and a first target radius reduction amount of the continuous casting round billet, and calculating a first hole pattern curve of a first hole according to the initial radius of the continuous casting round billet, the first target radius reduction amount and the first hole pattern shape parameter, wherein when the number of the reduction rolls is 3, the first hole pattern curve is three sections of first parabolas with the same shape, the corresponding angle of each section of first parabolas is 120 degrees, and any section of first parabolas is expressed as Y= - ((R-h)/(R+h) 2 )X 2 (R-h), wherein R represents the initial radius of the continuous casting round billet, h represents the first target radius reduction amount, X represents X-axis coordinate data, and Y represents Y-axis coordinate data; when the number of the pressing rollers is 2, the first hole-type curve is two sections of second parabolas with the same shape, one section of the second parabolas forms an upper arc of the first hole-type curve, the other section of the second parabolas forms a lower arc of the first hole-type curve, and any section of the second parabolas is expressed as Y= - ((R-h)/(R+h) 2 )X 2 +(R-h)；
Calculating a target radius of the continuous casting round billet based on the initial radius of the continuous casting round billet, the first target radius reduction amount and a preset second target radius reduction amount, and calculating a second hole pattern curve of a second hole according to the target radius of the continuous casting round billet, the initial radius of the continuous casting round billet and the second hole pattern shape parameter, wherein when the number of the reduction rolls is 3, the second hole pattern curve is three sections of third parabolas with the same shape, the corresponding angle of each section of third parabolas is 120 degrees, and any one section of third parabolas is expressed as Y= - (R1/R) 2 )X 2 +R1Wherein R1 represents a target radius of the continuous casting round billet, r1=r-h-a, and a represents a preset second target radius reduction amount; when the number of the pressing rollers is 2, the second hole-type curve is formed by two sections of fourth parabolas with the same shape, one section of the fourth parabola forms the left arc of the second hole-type curve, the other section of the fourth parabola forms the right arc of the second hole-type curve, and any section of the fourth parabola is expressed as Y= - (R1/R) 2 )X 2 +R1；
Calculating a third hole type curve of a third hole according to the target radius of the continuous casting round billet and the third hole type shape parameter, wherein when the number of the pressing rolls is 3, the third hole type curve is three sections of first circular arcs with the same shape, the corresponding angle of each section of first circular arc is 120 degrees, the radiuses of the three sections of first circular arcs are all the target radius of the continuous casting round billet, the first circular arcs and the roll gaps are in smooth transition, and the centers of the three sections of first circular arcs form a circle taking the center of the continuous casting round billet as a coordinate origin; when the number of the reduction rolls is 2, the third hole type curve is two sections of second circular arcs with the same shape, one section of second circular arc forms an upper arc of the third hole type curve, the other section of second circular arc forms a lower arc of the third hole type curve, the radius of each section of second circular arc is the target radius of the continuous casting round billet, the second circular arcs and the roll gaps are in smooth transition, and the two sections of second circular arcs form a circle taking the center of the continuous casting round billet as a coordinate origin;
and manufacturing three hole patterns of the continuous casting machine pressing device according to the first hole pattern curve, the second hole pattern curve and the third hole pattern curve.
2. The method of claim 1, wherein said creating three passes of the caster screw down apparatus according to said first pass profile, said second pass profile and said third pass profile comprises:
obtaining hole pattern arrangement data corresponding to the number of the pressing rollers;
and manufacturing three hole patterns of the continuous casting machine pressing device according to the hole pattern arrangement data, the first hole pattern curve, the second hole pattern curve and the third hole pattern curve.
3. The method of claim 2, wherein the step of determining the position of the substrate comprises,
when the number of the pressing rollers is 3, the hole pattern arrangement data are arranged in a 180-degree crossed mode between two adjacent hole patterns;
when the number of the reduction rolls is 2, the hole pattern arrangement data is a 90-degree crossed arrangement between two adjacent hole patterns.
4. The method of claim 3, wherein the step of,
the size of the roll gap is 4mm-10mm.
5. The method of claim 3, wherein the step of,
the initial radius of the continuous casting round billet is 140mm-175mm.
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