CN111889636B - Bulb type continuous casting crystallizer core rod - Google Patents
Bulb type continuous casting crystallizer core rod Download PDFInfo
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- CN111889636B CN111889636B CN202010741052.XA CN202010741052A CN111889636B CN 111889636 B CN111889636 B CN 111889636B CN 202010741052 A CN202010741052 A CN 202010741052A CN 111889636 B CN111889636 B CN 111889636B
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- core rod
- continuous casting
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- crystallizer
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 105
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052802 copper Inorganic materials 0.000 claims abstract description 28
- 239000010949 copper Substances 0.000 claims abstract description 28
- 230000007704 transition Effects 0.000 claims abstract description 7
- 238000013461 design Methods 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000007711 solidification Methods 0.000 abstract description 9
- 230000008023 solidification Effects 0.000 abstract description 9
- 238000001816 cooling Methods 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 206010033675 panniculitis Diseases 0.000 description 4
- 210000004304 subcutaneous tissue Anatomy 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/043—Curved moulds
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a bulb-type continuous casting crystallizer core rod. The curvature of the central axis of the core rod is matched with that of a continuous casting machine, and the design sizes of all sections are different; the cross section of the A end of the core rod is in a convex quadrilateral shape, each side is formed by clamping 1 straight line in the middle of 2 arc lines and is connected by a transition fillet; the cross section of the B end of the core rod is in a round corner rectangle shape; the outer contour lines of each section of the mandrel form a continuous variable-taper composite shape line of the mandrel; the average taper of the shape line at the end A of the core rod is larger than that at the end B; the section of the core rod is gradually changed from an outer convex quadrangle to a rectangle, the taper of the shape line is gradually reduced, and the shape of the core rod is similar to that of a bulb. The copper pipe processed and prepared by the core rod can be better attached to the solidification surface of a continuous casting billet and is closer to the solidification forming rule of the small square billet continuous casting billet, the thermal resistance of a crystallizer system is reduced, the heat exchange performance of the crystallizer is improved, the pulling speed of a continuous casting machine is accelerated, the abrasion of the copper pipe is reduced, the service life is prolonged, and the problems of shape defects and surface quality caused by uneven cooling of the corner part and the face part of the continuous casting small square billet are solved.
Description
Technical Field
The invention belongs to the technical field of continuous casting technology, metal solidification temperature field and thermal stress contraction displacement field, and particularly relates to a bulb-type core rod for preparing a copper pipe of a continuous casting crystallizer.
Background
Continuous casting technology is an important technology in the field of steel smelting, and a crystallizer is the core of a continuous casting machine. At present, most of the inner cavities of the continuous casting billet crystallizer copper pipes in China are in single taper or parabolic curves, the cross sections of the copper pipes are rectangular, when the pulling speed of a continuous casting machine is improved and the production rhythm is accelerated, the continuous casting billet continuous casting production line cannot well adapt to the solidification shrinkage rule of metal in the crystallizer, a large amount of uneven air gaps are generated between the inner cavity of the copper pipe and the surface of the continuous casting billet, the heat conductivity coefficient of the air gaps is far smaller than that of the metal, so that the internal thermal resistance of the crystallizer is increased, the heat transfer efficiency is reduced, the face cooling of corners is uneven, the shape defects of the continuous casting billet, such as squaring and diamond deformation are caused, the surface and subcutaneous tissue quality of the continuous casting billet are influenced, and the steel leakage is caused in serious cases, and the normal operation of the continuous casting production. The continuous casting crystallizer is a bottleneck which restricts the high speed and high quality of continuous casting production, and the design and optimization improvement of the crystallizer copper tube are not slow.
The bulb type continuous casting crystallizer core rod solves the reasonable distribution of a continuous casting billet temperature field, a thermal stress field and a shrinkage displacement field through finite element analysis simulation, physical modeling and numerical calculation, and further obtains the corresponding rules of the forming and thermal deformation of different metal materials under certain continuous casting conditions. The bulb type continuous casting crystallizer core rod is used as a mold, the inner cavity of the crystallizer copper pipe is processed by extrusion molding, the total thermal resistance of a crystallizer system is effectively reduced, the internal heat exchange capacity of the crystallizer system is improved, the problem of uneven cooling of the corners and the faces is solved, and the pulling speed and the continuous casting production efficiency of a continuous casting machine are further improved.
Disclosure of Invention
The invention provides a bulb-type continuous casting crystallizer core rod which is used as a mold for extrusion forming to process an inner cavity of a crystallizer copper pipe and is used for solving the problems that the existing single-taper or parabolic-taper crystallizer copper pipe has uneven cooling on the corner face, limited heat conduction performance, low production efficiency due to slow drawing speed of a continuous casting machine, abrasion of the inner cavity of the copper pipe, poor quality of a casting blank surface and a subcutaneous tissue of the casting blank and the like.
The technical scheme adopted by the invention is as follows:
a bulb-type continuous casting mold core rod comprising:
the plug for forming crystallizer copper pipe inner chamber shape and shape line includes:
the section of the core rod close to the upper half part of the core rod is an outward convex quadrangle, the four sides of the outward convex quadrangle are respectively composed of 2 arc lines, 1 straight line and a transition arc, and the outward convex quadrangle is continuous and smoothly transited as shown in the section A-A in figure 3.
The outer contour line at one end of the cambered surface of the mandrel consists of an arc R42 (minor arc), a straight line segment L11, an arc R11 (minor arc) and a fillet curve R51; an arc R21 (minor arc), a straight line segment L12, an arc R31 (minor arc) and a fillet curve R52 form an outer contour line at one end of the straight surface of the mandrel; an arc R12 (minor arc), a straight line segment L13, an arc R41 (minor arc) and a fillet curve R53 form the outer contour line at the other end of the arc surface of the mandrel; an arc R32 (minor arc), a straight line segment L14, an arc R22 (minor arc) and a fillet curve R54 form the outer contour line of the other end of the straight surface of the mandrel; r51, R52, R53 and R54 are transition arcs.
The sizes of all the sections close to the upper half part of the core rod are different, and the specific size of the section is determined by finite element simulation and numerical calculation according to the continuous casting process condition and the continuous casting material parameters;
when the continuous casting billet cross-section is the rectangle, during its continuous casting crystallizer plug that corresponds was close first half cross section, the inequality of plug cambered surface arc line and the straight surface arc line size of plug includes: arc R21 ≠ R11, arc R31 ≠ R12, arc R41 ≠ R32, and arc R42 ≠ R22; in a similar way, the sizes of the arc surface straight line and the straight surface straight line in the cross section are unequal, and the method comprises the following steps: l11 ≠ L12, L12 ≠ L13, L13 ≠ L14, and L11 ≠ L14; the section A-A of the core rod is of a central symmetrical structure about the symmetry axes of the x and y axes, namely: r11 ═ R12, R21 ═ R22, R31 ═ R32, R41 ═ R42, L11 ═ L13, and L12 ═ L14.
When the continuous casting billet cross-section is square, all arc sizes of the cross-section of the upper half part of the continuous casting crystallizer core rod corresponding to the square are equal, and the method comprises the following steps: the arc R11 ═ R21 ═ R31 ═ R12 ═ R41 ═ R32 ═ R22 ═ R42. Similarly, all lines are equal in size, including: L11-L12-L13-L14.
The cross section of the core rod close to the lower half part of the core rod is rectangular, and four corners of the core rod are transition fillets adaptive to the continuous casting billet, as shown in the cross section B-B in figure 4. When the continuous casting billet is square, the section of the lower half part of the continuous casting crystallizer core rod corresponding to the continuous casting billet is a rounded square.
The bulb type continuous casting crystallizer core rod integrally has a certain radian along the length direction, the curvature radius of the bulb type continuous casting crystallizer core rod is matched with a corresponding model type continuous casting machine, the radian is not only arranged on the length direction of the core rod, but also the taper is continuously changed, namely, the sizes of all sections are different. The cross section of the core rod is smoothly transited from the convex quadrangle at the A end to the rectangle at the B end, and the section intercept point position of the convex quadrangle transformed into the rectangle is obtained by a physical modeling and numerical calculation method.
The taper of the upper opening of the bulb-type core rod is larger than that of the lower opening, and the taper change rate of the upper opening is higher than that of the lower opening; on the cross section, if the arc length of the arc line of the arc surface of the core rod is greater than that of the arc line of the straight surface of the core rod, namely the side length of the arc surface of the correspondingly produced continuous casting billet is greater than that of the straight surface, the overall average taper of the arc surface of the core rod is smaller than that of the straight surface of the core rod; otherwise, the overall average taper of the arc surface of the core rod is larger than that of the straight surface of the core rod; the conicity values of any section of the core rod are different, and the specific values are obtained by a physical modeling and numerical calculation method.
The invention has the beneficial effects that: the inner cavity of the copper pipe of the continuous casting crystallizer, which is processed and prepared by the core rod, can be better attached to the solidification surface of the continuous casting billet, so that the copper pipe and the inner cavity of the copper pipe of the continuous casting crystallizer are not extruded in a contact manner, a larger or uneven air gap does not exist, the copper pipe is closer to the solidification forming rule of the continuous casting billet, the thermal resistance of a crystallizer system is reduced, the heat exchange performance and efficiency of the crystallizer are improved, the pulling speed of a continuous casting machine is accelerated, the abrasion of the copper pipe is reduced, the service life is prolonged, and the problems.
Drawings
FIG. 1 is a schematic view of a bulb-type continuous casting mold core rod of the present invention.
Fig. 2 is a top view of the bulb-type continuous casting mold core rod of the present invention.
FIG. 3 is an enlarged sectional view of the bulb-type continuous casting mold core rod A-A of the present invention.
FIG. 4 is an enlarged sectional view of the bulb-type continuous casting mold core rod B-B of the present invention.
Detailed Description
As shown in figure 1, the bulb-type continuous casting crystallizer core rod has the advantages that the overall external contour dimension of the core rod is shrunk from top to bottom, the taper and the radian exist, the cross section close to the upper half part of the core rod is a convex quadrilateral, and the cross section close to the lower half part of the core rod is a rectangle.
In the embodiment of the invention, aiming at a billet continuous casting crystallizer core rod, the cross section close to the upper half part is an outward convex quadrangle, so that the shape of the inner cavity of the copper pipe more accurately conforms to the solidification forming rule of continuous casting steel, because the corner of the continuous casting billet is subjected to heat flow loss from the x axis and the y axis simultaneously in the crystallizer copper pipe, and the face is only subjected to heat flow loss in one direction, the total heat conduction amount of the corner of the same section is larger than that of the face, the temperature distribution condition of the cross section of the continuous casting billet is that the temperature of the corner is lower than that of the face, according to a thermal elastoplasticity model and a Chorinov solidification square root law, the elastoplasticity arc line of the corner of the continuous casting billet is larger than that of the face, the distribution gradient and the change rate of the temperature field and the contraction displacement field of the corner are larger.
In the invention, the structure has the advantages that: the outer contour line of the core rod is more suitable for the solidification deformation rule of a continuous casting billet, so that an air gap between the inner surface of a copper pipe and the surface of the continuous casting billet is uniform, the heat exchange uniformity in a crystallizer system is improved, the sum of the contact thermal resistances of the system is reduced, the heat exchange cooling capacity and the heat exchange efficiency of the crystallizer are enhanced, the sufficient thickness of a continuous casting billet shell at the outlet of the crystallizer is ensured, the drawing speed of a continuous casting machine can be accelerated under the condition of reasonably controlling the continuous casting process, the surface quality and the subcutaneous tissue quality of the continuous casting billet are improved, the abrasion of the inner cavity of the copper pipe of the crystallizer is reduced, the service life and the steel passing amount of the copper pipe are prolonged, the shape defects of.
In the embodiment of the invention, aiming at the billet continuous casting crystallizer core rod, the section close to the lower half part is rectangular, so as to meet the requirement of billet continuous casting forming at the position close to an outlet of a crystallizer to obtain continuous casting billets with different models meeting production requirements, when the continuous casting billet enters the middle and rear sections of a continuous casting process, a continuous casting billet shell enters a stable growth state from an initial state, a continuous casting billet temperature field and a shrinkage displacement field are gradually and uniformly stabilized, meanwhile, the temperature field distribution gradient of the corner part and the face part of the casting billet is gradually reduced, the thermal deformation difference is reduced, and at the moment, the section of the continuous casting billet in the inner cavity of a copper pipe is required to meet the production requirements, and the continuous casting billet passes through an.
In the embodiment of the invention, the specific section size of the small square billet continuous casting crystallizer core rod is obtained by finite element simulation, physical modeling and numerical calculation methods.
In the embodiment of the invention, the central axis of the whole bulb type continuous casting crystallizer core rod is an arc line with radius Rz, the surface of the external contour thereof has both radian and conicity, the radian is kept to be matched with a continuous casting machine, the conicity can be expressed as a composite curve with continuously variable conicity, and the specific design size of the conicity of the core rod is obtained by a physical modeling and numerical calculation method according to actual continuous casting conditions and process parameters.
In the implementation mode of the invention, the outer contour dimension of the bulb type continuous casting crystallizer core rod is partially overlapped with the dimension of the inner cavity of the crystallizer copper pipe designed and processed, the overlapped part is an effective design dimension, and a margin is reserved according to the processing requirement.
The bulb-type continuous casting crystallizer core rod can be applied to the processing and preparation of crystallizer copper tubes in the field of steel continuous casting, and has the advantages of good heat transfer balance, high total heat exchange amount, strong heat exchange performance, long service life, good quality of continuous casting billet surface and subcutaneous tissues, high continuous casting production efficiency and the like.
Finally, it should be noted that the present specification and the accompanying drawings are only used for matching with the technical solutions of the present invention, and are not used for limiting the limit conditions that the present invention can implement, so that modifications in structure, changes in proportion and adjustments in size are all within the scope that can be covered by the technical contents disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Claims (2)
1. A bulb-type continuous casting crystallizer core rod is characterized in that the bulb-type continuous casting crystallizer core rod is a mold for forming the inner surface of a continuous casting crystallizer copper pipe when the bulb-type continuous casting crystallizer core rod is used for preparing the copper pipe; the overall outline size of the core rod is shrunk from top to bottom, the section close to the upper half part is a convex quadrilateral, the section close to the lower half part is a rectangle or a square, and the shape is similar to a bulb, so the bulb type continuous casting crystallizer core rod is named;
two side surfaces of the core rod with radian are called cambered surfaces, and two side surfaces of the core rod without radian and only with conicity are called straight surfaces;
the core rod is used for preparing and processing the shape line of the inner cavity of the copper pipe of the crystallizer and the design size thereof, and comprises the following components:
the cross section close to the upper half part of the core rod is an outward convex quadrangle, the four sides of the outward convex quadrangle are respectively composed of 2 arc lines, 1 straight line and a transition arc, and the outward convex quadrangle is continuous and smooth;
the outer contour line at one end of the cambered surface of the mandrel consists of an arc R42, a straight line segment L11, an arc R11 and a fillet curve R51; the arc R12, the straight line segment L13, the arc R41 and the fillet curve R53 form the outer contour line at the other end of the arc surface of the mandrel; an arc R21, a straight line segment L12, an arc R31 and a fillet curve R52 form an outer contour line at one end of a straight surface of the mandrel; the arc R32, the straight line segment L14, the arc R22 and the fillet curve R54 form the outer contour line of the other end of the straight surface of the mandrel; r51, R52, R53 and R54 are transition arcs;
the sizes of all the sections close to the upper half part of the core rod are different, and the specific size of the section is determined by finite element simulation and numerical calculation according to the continuous casting process condition and the continuous casting material parameters;
when the section of the continuous casting billet is rectangular, the size of the arc line of the arc surface of the core rod is not equal to that of the arc line of the straight surface of the core rod in the corresponding continuous casting crystallizer core rod close to the upper half part of the cross section; in a similar way, the sizes of the arc surface straight line and the straight surface straight line in the cross section are not equal; the cross section is symmetrical about the x, y axes;
when the cross section of the continuous casting billet is square, all circular arc lines of the cross section of the upper half part of the continuous casting crystallizer core rod corresponding to the continuous casting billet are equal in size; in the same way, all the straight lines are equal in size;
the section of the core rod close to the lower half part of the core rod is rectangular, and four corners of the core rod are transition fillets adaptive to continuous casting billets; when the continuous casting billet is square, the section of the lower half part of the continuous casting crystallizer core rod corresponding to the continuous casting billet is a rounded square;
the bulb-type continuous casting crystallizer core rod integrally has a certain radian along the length direction, the curvature radius of the bulb-type continuous casting crystallizer core rod is matched with a corresponding model continuous casting machine, the radian and the continuously variable taper exist in the length direction of the core rod, the taper of an upper opening of the core rod is larger than that of a lower opening, and the taper change rate of the upper opening is higher than that of the lower opening; on the cross section, if the arc length of the arc line of the arc surface of the core rod is greater than that of the arc line of the straight surface of the core rod, the side length of the arc surface of the correspondingly produced continuous casting billet is greater than that of the straight surface of the core rod, and the overall average taper of the arc surface of the core rod is smaller than that of the straight surface of the core rod; otherwise, the overall average taper of the cambered surface of the core rod is larger than that of the straight surface of the core rod; the conicity values of any section of the core rod are different, and the specific values are obtained by a physical modeling and numerical calculation method.
2. The bulb-type continuous casting mold mandrel as recited in claim 1, wherein arc R42, arc R11, arc R21, arc R31, arc R12, arc R41, arc R32, and arc R22 are minor arcs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010741052.XA CN111889636B (en) | 2020-07-29 | 2020-07-29 | Bulb type continuous casting crystallizer core rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010741052.XA CN111889636B (en) | 2020-07-29 | 2020-07-29 | Bulb type continuous casting crystallizer core rod |
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| CN111889636A CN111889636A (en) | 2020-11-06 |
| CN111889636B true CN111889636B (en) | 2021-05-18 |
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| CN202010741052.XA Active CN111889636B (en) | 2020-07-29 | 2020-07-29 | Bulb type continuous casting crystallizer core rod |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5641051A (en) * | 1979-09-14 | 1981-04-17 | Nippon Steel Corp | Continuous casting method of steel |
| ES2056670T5 (en) * | 1991-02-06 | 2001-02-01 | Concast Standard Ag | LINGOTERA FOR CONTINUOUS METAL COLADA, PARTICULARLY STEEL. |
| CN103537638A (en) * | 2013-11-07 | 2014-01-29 | 济南东方结晶器有限公司 | Crystallizer copper pipe molding core rod |
| CN205200475U (en) * | 2015-12-09 | 2016-05-04 | 西南铝业（集团）有限责任公司 | Aluminum alloy side is crystallizer for spindle |
| CN110744020A (en) * | 2019-11-29 | 2020-02-04 | 济南东方结晶器有限公司 | Crystallizer copper pipe curve taper structure |
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