CN112548055A - Device and method for semi-continuous casting of ultra-wide aluminum alloy slab ingot - Google Patents
Device and method for semi-continuous casting of ultra-wide aluminum alloy slab ingot Download PDFInfo
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- CN112548055A CN112548055A CN202011445343.0A CN202011445343A CN112548055A CN 112548055 A CN112548055 A CN 112548055A CN 202011445343 A CN202011445343 A CN 202011445343A CN 112548055 A CN112548055 A CN 112548055A
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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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
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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
- B22D11/14—Plants for continuous casting
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Abstract
The invention discloses a device and a method for the semi-continuous casting of an ultra-wide aluminum alloy slab ingot, and the device for the semi-continuous casting of the ultra-wide aluminum alloy slab ingot comprises the following steps: the device comprises a launder, a stopper rod, a crystallizer, a dummy bar head and at least two shunting bags, wherein the stopper rod is arranged on the launder and used for controlling the flow of aluminum alloy melt, the tail end of the launder is communicated with all the shunting bags through a guide pipe, the crystallizer is positioned below all the shunting bags, and the dummy bar head is positioned below the crystallizer. The device for semi-continuous casting of the ultra-wide aluminum alloy flat ingot efficiently improves the flowing uniformity of the aluminum alloy melt in the crystallizer, the temperature distribution of the aluminum alloy melt is uniform, the liquid cavity appearance is mild, and finally the uniformity of solute and tissue in the ultra-wide aluminum alloy flat ingot is favorably improved.
Description
Technical Field
The invention relates to the technical field of aluminum alloy casting, in particular to a device and a method for semi-continuous casting of an ultra-wide aluminum alloy slab ingot.
Background
It is well known that an aluminum alloy ingot is a base material for processing an application end aluminum alloy member, and the quality of the ingot directly affects the properties of a final processed product. In the semi-continuous casting process of the aluminum alloy, the difference of the internal cooling speed and the external cooling speed of a casting blank is large, and the solidification of a melt is asynchronous, so that the solidification structure and the components of the cast ingot are not uniform inevitably, namely the non-uniformity of the cast ingot. The severe inhomogenity of the ingot is difficult to eliminate by subsequent heat treatment processes, which can significantly deteriorate the properties of the final product or lead to product scrap.
Disclosure of Invention
The invention aims to provide a device and a method for semi-continuous casting of an ultra-wide aluminum alloy flat ingot, which effectively improve the flow uniformity of an aluminum alloy melt in a crystallizer, ensure the uniform temperature distribution of the aluminum alloy melt and the smooth liquid cavity appearance, and finally are beneficial to improving the uniformity of solute and tissues in the ultra-wide aluminum alloy flat ingot.
In order to achieve the above object, the present invention provides an apparatus for semi-continuous casting of an ultra-wide aluminum alloy slab ingot, comprising: the device comprises a launder, a stopper rod, a crystallizer, a dummy bar head and at least two shunting bags, wherein the stopper rod is arranged on the launder and used for controlling the flow of aluminum alloy melt, the tail end of the launder is communicated with all the shunting bags through a guide pipe, the crystallizer is positioned below all the shunting bags, and the dummy bar head is positioned below the crystallizer.
Optionally, the flow groove is vertically arranged above all the diversion bags.
Optionally, the number of the diversion bags is two, and the flow groove is located in the middle of the two diversion bags.
Optionally, all the distribution bags are uniformly distributed above the crystallizer.
Optionally, all of the diversion bags are horizontally disposed.
The embodiment of the invention also provides a method for the semi-continuous casting of the ultra-wide aluminum alloy slab ingot, which is suitable for the device for the semi-continuous casting of the ultra-wide aluminum alloy slab ingot and comprises the following steps:
1) introducing cooling water into the crystallizer;
2) introducing an aluminum alloy melt into the launder, wherein the aluminum alloy melt flows through the flow guide pipe and then is divided into two flow dividing bags, and the aluminum alloy melt enters the crystallizer through the flow dividing bags, and after a blank shell is formed by solidification in the crystallizer, a dummy bar head is started for casting;
3) and when the dummy bar head moves to the preset position, stopping leading in the aluminum alloy melt, and controlling the dummy bar head to stop running to finish casting.
Compared with the background art, the device for the semi-continuous casting of the ultra-wide aluminum alloy slab ingot provided by the embodiment of the invention comprises the following components: the runner is arranged on the stopper rod and used for controlling the flow of the aluminum alloy melt, the tail end of the runner is communicated with all the shunting bags through a guide pipe, the crystallizer is located below all the shunting bags, and the dummy bar head is located below the crystallizer.
The device for semi-continuous casting of the ultra-wide aluminum alloy flat ingot adopts a flow distribution method of two flow distribution bags, so as to improve the homogeneity of the ultra-wide flat ingot; compared with the distribution mode of a single distribution bag in the aluminum alloy semi-continuous casting, the scheme of the application can effectively improve the uniformity of melt flow and temperature distribution in the whole molten pool, is very favorable for the production of ultra-wide aluminum alloy homogeneous cast ingots, has small change to the whole pouring distribution system, low investment and good effect, and is more suitable for industrial popularization and use.
The embodiment of the invention also provides a method for semi-continuous casting of the ultra-wide aluminum alloy slab ingot, which has the beneficial effects and is not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural view of an apparatus for semi-continuous casting of an ultra-wide aluminum alloy slab ingot according to an embodiment of the present invention;
FIG. 2 is a diagram showing the effect of the semi-continuous casting apparatus for ultra-wide aluminum alloy slab ingot according to the embodiment of the present invention;
wherein:
1-stopper rod, 2-launder, 3-draft tube, 4-crystallizer, 5-dummy bar head, 61-first diversion bag, 62-second diversion bag and 01-cooling water.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides a device for semi-continuous casting of an ultra-wide aluminum alloy slab ingot, which is shown in the attached figure 1 in the reference specification and comprises the following components: stopper rod 1, launder 2, draft tube 3, crystallizer 4, dummy bar head 5 and at least two split bags, herein exemplified by a first split bag 61 and a second split bag 62.
The stopper rod 1 is arranged in the launder 2, and after the aluminum alloy melt meets the requirements through the refining of the standing furnace, the aluminum alloy melt flows through the degassing and filtering processes in sequence through the launder 2 and finally reaches the upper part of a pouring gate of the crystallizer 4, and the stopper rod 1 is matched to control the flow and then flows into the crystallizer 4 through the shunt bag.
The tail end of the launder 2 is communicated with a first diversion bag 61 and a second diversion bag 62 through a diversion pipe 3, the crystallizer 4 is positioned below the first diversion bag 61 and the second diversion bag 62, and the dummy bar head 5 is positioned below the crystallizer 4.
That is, the aluminum alloy melt forms a solidified shell with certain strength under the action of the cooling water 01 of the crystallizer 4, the casting blank gradually descends to a casting well at a certain pulling speed under the supporting action of the dummy bar head 5, the aluminum alloy melt which is not solidified in the liquid cavity is gradually solidified from outside to inside under the further cooling action of secondary cooling water, and finally the casting blank with certain specification is cast.
In the forming process, the uniformity of the structure and components of the casting blank is closely related to the flow condition of the aluminum alloy melt in the liquid cavity, and the unreasonable flow distribution mode directly causes the uneven flow distribution of the aluminum alloy melt in the liquid cavity, and finally deteriorates the uniformity of the casting blank.
Especially for the semi-continuous casting process of the ultra-wide flat ingot, the applicant finds that if a single shunting bag is adopted for distributing the high-temperature molten aluminum, due to the fact that momentum of the high-temperature molten aluminum shunted out from the side surface is small, the high-temperature molten aluminum is difficult to reach the side surface of the ultra-wide flat ingot, a flow dead zone exists in a liquid cavity, and the flow field distribution is extremely uneven; in addition, as a large amount of fresh high-temperature aluminum liquid is limited in the central area of the slab ingot, the depth of the liquid cavity is deeper, and the homogeneity of the slab ingot is further deteriorated; therefore, the flow distribution mode of the single flow distribution bag arranged in the middle is difficult to meet the preparation requirement of the ultra-large wide homogeneous slab ingot.
The applicant considers: the heterogeneity of the ingot is an inherent property of the cast metal material, and the degree of heterogeneity of the ingot can be reduced to an acceptable range only by an appropriate method. The liquid cavity is relatively shallow in the semi-continuous casting process of the aluminum alloy, and the uniformity of the solidification structure and components is mainly influenced by the solidification rate of the melt in the liquid cavity, the flow state of the melt in the liquid cavity and other factors. The flow state of the melt in the liquid cavity directly influences the uniformity of the temperature distribution of the melt and the transmission and distribution of the precipitated solute in the solidification process. Therefore, for the aluminum alloy semi-continuous casting process, among the influence factors of the homogeneity degree of the cast ingot, the reasonability of the melt flow in the liquid cavity is particularly critical.
At present, aiming at the problem of the heterogeneity of aluminum alloy ingots in the semi-continuous casting process, the control is usually carried out by adapting reasonable casting process parameters and optimizing key structure parameters such as the size, the opening size and the position of a shunting bag. The method is suitable for improving the homogeneity of the narrow-width small-section casting blank. For an ultra-wide aluminum alloy slab ingot, the pouring speed is low, the momentum of an aluminum alloy melt flowing out of a shunting bag is insufficient, the melt in a liquid cavity is difficult to flow uniformly in the flow distribution mode of a single shunting bag arranged in the middle, particularly, the fresh aluminum alloy melt is difficult to reach in a side area far away from the center of a casting blank, the temperature gradient of the cross section is increased due to the non-uniformity of the melt flow, the solute transmission in the width direction is limited, and finally the non-uniformity of the ultra-wide ingot is aggravated.
Obviously, the limitation of the distribution mode of the single shunting bag determines that the method is difficult to reduce the heterogeneous degree of the ultra-wide aluminum alloy slab ingot. Therefore, in order to solve the problem of serious ingot casting heterogeneity caused by unreasonable distribution mode of a single distribution bag in the ultra-wide aluminum alloy flat ingot semi-continuous casting process, a distribution method suitable for ultra-wide aluminum alloy flat ingot casting is urgently needed to be provided, so that the heterogeneity degree of the ingot casting is reduced.
Based on this, the device that is used for semi-continuous casting of super broad width aluminum alloy slab ingot that this paper provided, through the first reposition of redundant personnel bag 61 of width direction suitable position symmetry biasing and second reposition of redundant personnel bag 62 at crystallizer 4, can overcome because of setting up the limitation of single reposition of redundant personnel bag distribution mode, super broad width slab ingot limit portion and central zone melt flow are all more abundant, effectively improved the flow homogeneity of aluminum alloy melt in whole molten bath, the temperature distribution of aluminum alloy melt is even, the liquid cave appearance is mild, finally be favorable to improving the homogeneity of solute and tissue in the super broad width slab ingot of aluminum alloy.
The shunting bag is used for shunting and guiding aluminum alloy melt in a crystallizer and filtering the melt during casting, so that the melt is uniformly distributed and guided from the center to the periphery, and the shunting bag also plays a role in buffering the melt, stably flowing and filling and filtering the melt, and the specific shape and structure of the shunting bag can refer to the prior art, and the shunting bag is not substantially improved.
Obviously, before designing a device for the semi-continuous casting of ultra-wide aluminum alloy slab ingots, the structure and parameters of the distribution bag are firstly determined according to the crystallizer 4; then, the positions of the first branch bag 61 and the second branch bag 62 are determined according to the width of the crystallizer 4; finally, the size of the draft tube 3 is determined according to the positions of the first diversion bag 61 and the second diversion bag 62. And after the related parts are installed, the device for semi-continuous casting of the ultra-wide aluminum alloy slab ingot is formed.
Of course, the launder 2 may be arranged vertically above all the distribution bags, as shown in the description of fig. 1. In addition, in the case of providing two split bags, the launder 2 is preferably provided at an intermediate position between the first split bag 61 and the second split bag 62, so that the first split bag 61 and the second split bag 62 can simultaneously discharge the aluminum alloy melt, thereby further reducing the degree of non-homogeneity of the ingot.
All the shunting bags can be uniformly distributed above the crystallizer 4, so that the flowing of the aluminum alloy melt in the crystallizer 4 and the uniformity of temperature distribution can be further improved, and the production of ultra-wide aluminum alloy homogeneous ingots is facilitated.
All the diversion bags can be horizontally arranged, namely the first diversion bag 61 and the second diversion bag 62 can be uniformly and horizontally distributed above the crystallizer 4, as shown in the specification and attached drawings 1 and 2, so that the uniformity of the flow and the temperature distribution of the aluminum alloy melt can be improved to the maximum extent, and the non-homogeneous degree of the cast ingot can be reduced.
The embodiment of the invention also provides a method for the semi-continuous casting of the ultra-wide aluminum alloy slab ingot, which is suitable for the device for the semi-continuous casting of the ultra-wide aluminum alloy slab ingot, and the method comprises the following steps:
1) introducing cooling water 01 into the crystallizer 4;
2) introducing an aluminum alloy melt into the launder 2, wherein the aluminum alloy melt flows through the flow guide pipe 3 and then is divided into two flow dividing bags, and then enters the crystallizer 4 through the flow dividing bags, and after a blank shell is formed by solidification in the crystallizer 4, a dummy bar head 5 is started for casting;
3) and when the dummy bar head 5 moves to the preset position, stopping introducing the aluminum alloy melt, and controlling the dummy bar head 5 to stop running to finish casting.
The method for semi-continuous casting of the ultra-wide aluminum alloy flat ingot can effectively improve the flow of the aluminum alloy melt in the crystallizer and the uniformity of temperature distribution, is very favorable for the production of ultra-wide aluminum alloy homogeneous ingots, has small change to the whole pouring and distributing system, low investment and good effect, and is more suitable for industrial popularization and use.
The apparatus and method for semi-continuous casting of ultra-wide aluminum alloy slab ingots according to the present invention have been described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. An apparatus for semi-continuous casting of ultra-wide aluminum alloy slab ingots, comprising: the device comprises a launder, a stopper rod, a crystallizer, a dummy bar head and at least two shunting bags, wherein the stopper rod is arranged on the launder and used for controlling the flow of aluminum alloy melt, the tail end of the launder is communicated with all the shunting bags through a guide pipe, the crystallizer is positioned below all the shunting bags, and the dummy bar head is positioned below the crystallizer.
2. The apparatus for the semi-continuous casting of an ultra-wide aluminum alloy slab ingot according to claim 1, wherein the launder is vertically disposed above all of the split pockets.
3. An apparatus for semi-continuous casting of ultra-wide aluminum alloy slab ingot according to claim 2, wherein the number of the diversion bags is two, and the launder is located at the middle position of the two diversion bags.
4. An apparatus for semi-continuous casting of ultra-wide aluminum alloy slab ingot according to any one of claims 1 to 3, wherein all the distribution bags are evenly distributed over the crystallizer.
5. An apparatus for semi-continuous casting of ultra-wide aluminum alloy slab ingot according to any one of claims 1 to 3, wherein all of the diversion bags are horizontally disposed.
6. A method for semi-continuous casting of ultra-wide aluminum alloy slab ingots, suitable for use in the apparatus of any of the preceding claims 1-5, comprising the steps of:
1) introducing cooling water into the crystallizer;
2) introducing an aluminum alloy melt into the launder, wherein the aluminum alloy melt flows through the flow guide pipe and then is divided into two flow dividing bags, and the aluminum alloy melt enters the crystallizer through the flow dividing bags, and after a blank shell is formed by solidification in the crystallizer, a dummy bar head is started for casting;
3) and when the dummy bar head moves to the preset position, stopping leading in the aluminum alloy melt, and controlling the dummy bar head to stop running to finish casting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011445343.0A CN112548055A (en) | 2020-12-11 | 2020-12-11 | Device and method for semi-continuous casting of ultra-wide aluminum alloy slab ingot |
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| CN202011445343.0A CN112548055A (en) | 2020-12-11 | 2020-12-11 | Device and method for semi-continuous casting of ultra-wide aluminum alloy slab ingot |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115717208A (en) * | 2021-08-24 | 2023-02-28 | 昆山晶微新材料研究院有限公司 | Aviation aluminum alloy material and production method thereof |
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| CN108637200A (en) * | 2018-04-03 | 2018-10-12 | 东北大学 | The long flat bloom semi-continuous casting device of big specification magnesium alloy |
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| JPH11156487A (en) * | 1997-11-25 | 1999-06-15 | Showa Alum Corp | Semi-continuous casting method of aluminum and apparatus therefor |
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| CN115717208B (en) * | 2021-08-24 | 2024-05-24 | 昆山晶微新材料研究院有限公司 | Aviation aluminum alloy material and production method thereof |
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Application publication date: 20210326 |