CN117548635A - Casting shunt and design method thereof - Google Patents
Casting shunt and design method thereof Download PDFInfo
- Publication number
- CN117548635A CN117548635A CN202311618156.1A CN202311618156A CN117548635A CN 117548635 A CN117548635 A CN 117548635A CN 202311618156 A CN202311618156 A CN 202311618156A CN 117548635 A CN117548635 A CN 117548635A
- Authority
- CN
- China
- Prior art keywords
- outlet
- casting
- inlet
- flow
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005266 casting Methods 0.000 title claims abstract description 151
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000013461 design Methods 0.000 title claims abstract description 8
- 239000000155 melt Substances 0.000 claims abstract description 82
- 238000009826 distribution Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims description 34
- 238000005192 partition Methods 0.000 claims description 15
- 230000008676 import Effects 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims 3
- 238000004513 sizing Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 14
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 238000005204 segregation Methods 0.000 description 11
- 229910000838 Al alloy Inorganic materials 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000007872 degassing Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910018580 Al—Zr Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910018182 Al—Cu Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/15—Correlation function computation including computation of convolution operations
-
- 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
-
- 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
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Data Mining & Analysis (AREA)
- Mathematical Physics (AREA)
- Algebra (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Databases & Information Systems (AREA)
- Computing Systems (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a casting shunt and a design method of the casting shunt, the casting shunt comprises: the first diversion cavity is provided with a first inlet and a first outlet which are oppositely arranged, the first inlet is a melt inlet, the first inlet is positioned at the top of the first diversion cavity, and the first outlet is positioned on the side wall of the first diversion cavity; the second flow dividing cavity is mutually independent from the first flow dividing cavity, the second flow dividing cavity is provided with a second inlet and a second outlet which are oppositely arranged, the second inlet is positioned at the bottom of the second flow dividing cavity, the first inlet is positioned above the second inlet, the second outlet is positioned on the side wall of the second flow dividing cavity, the second inlet is used for being communicated with the bottom of the crystallizer casting cavity, and the second outlet is arranged adjacent to the first outlet. By the technical scheme, the problem that the flow distribution bag in the prior art is poor in melt flow performance can be solved.
Description
Technical Field
The invention relates to the technical field of metal casting, in particular to a casting shunt and a design method of the casting shunt.
Background
At present, a metal ingot is a primary working procedure of metal processing, particularly in the field of aluminum alloy casting, the quality of the ingot determines the material performance of a product to be processed subsequently to a great extent, in the process of the aluminum alloy ingot, a crystallizer is used for cooling and forming a liquid aluminum alloy melt, but with the increasing demands of aerospace, ships and rail transit in China on a large-scale aluminum alloy structure, the specification of the aluminum alloy ingot is also larger and larger, the larger the size of the ingot is, the larger the difference between the internal cooling rate and the external cooling rate of the ingot is, the more serious the macrosegregation of the ingot is, the macrosegregation scale runs through the whole ingot and cannot be eliminated through subsequent processing and heat treatment, so the macrosegregation is a permanent irreversible defect, and the stability of the product quality is seriously influenced.
In the prior art, a glass fiber cloth combined shunt bag is mainly adopted for shunting a melt in the semi-continuous casting of an aluminum alloy slab ingot, the flow direction of fluid is controlled, so that the solid-liquid two-phase aluminum alloy in the casting process generates relative motion, the degree of macrosegregation is reduced, but the traditional shunt bag has a smaller melt proportion from the bottom outlet, the improvement on the melt flow in a liquid cavity in a casting cavity is limited, negative segregation of an ingot core part can be caused, the segregation degree can reach more than 20% along with the increase of the ingot specification, and sometimes the components possibly exceed the standard grade range of the alloy.
Disclosure of Invention
The invention provides a casting shunt and a design method of the casting shunt, which are used for solving the problem that a shunt bag in the prior art is poor in melt flow performance improvement.
According to one aspect of the present invention, there is provided a cast shunt, the cast shunt comprising: the first diversion cavity is provided with a first inlet and a first outlet which are oppositely arranged, the first inlet is a melt inlet, the first inlet is positioned at the top of the first diversion cavity, and the first outlet is positioned on the side wall of the first diversion cavity; the second flow dividing cavity is mutually independent from the first flow dividing cavity, the second flow dividing cavity is provided with a second inlet and a second outlet which are oppositely arranged, the second inlet is positioned at the bottom of the second flow dividing cavity, the first inlet is positioned above the second inlet, the second outlet is positioned on the side wall of the second flow dividing cavity, the second inlet is used for being communicated with the bottom of the crystallizer casting cavity, and the second outlet is arranged adjacent to the first outlet.
Further, the first outlets and the second outlets are all provided with a plurality of, the first outlets are symmetrically arranged on the first flow distribution cavity in the center of the first flow distribution cavity, and the first outlets and the second outlets are arranged in one-to-one correspondence.
Further, the flow area at the first outlet is 0.8 to 1.2 times the flow area at the second outlet.
Further, it is characterized in that the flow direction of the second outlet is parallel to the flow direction of the first outlet, and the end face of the second inlet is arranged along the horizontal direction.
Further, a filter assembly is disposed at the first outlet.
Further, the casting shunt comprises a shell and a partition plate, wherein the partition plate is arranged in the shell to form a first shunt cavity and a second shunt cavity which are distributed up and down, a first inlet is formed in the top of the shell, a first outlet and a second outlet are formed in the side wall of the shell, the first outlet is located above the partition plate, the second outlet is located below the partition plate, and a second inlet is formed in the bottom of the shell.
Further, a honeycomb duct is arranged at the second inlet and is communicated with the second inlet.
Further, the casting shunt includes first advance pipe, first exit tube, second advance pipe and second exit tube, first advance pipe and the intercommunication of first exit tube each other, first advance the pipe and be located the top of first exit tube, the tip of first advance pipe forms first import, the tip of first exit tube forms first export, the second advances the pipe and communicates with each other with the second exit tube, the second advances the pipe and is located the below of second exit tube, the tip of second advances the pipe forms the second import, the tip of second exit tube forms the second export, the outside at the second exit tube is established to first exit tube cover.
Further, the first inlet pipe and the second inlet pipe are coaxially arranged, and the first outlet pipe and the second outlet pipe are coaxially arranged.
According to another aspect of the present invention, there is provided a method of designing a casting shunt, the casting shunt being the casting shunt described above, the method comprising: step one: acquiring the size of a casting cavity of the crystallizer, and determining the size of a casting shunt according to the size of the casting cavity of the crystallizer; step two: establishing a steady-state heat flow coupling model in the casting process according to the size of a casting cavity of the crystallizer, the size of a casting shunt and the casting process, and acquiring flow field distribution in the casting cavity of the crystallizer according to the steady-state heat flow coupling model; step three: performing CFD analysis according to the flow field distribution, and preparing a casting shunt according to the size of the casting shunt if the flow rate of the melt at the second inlet meets a preset standard; if the melt flow rate at the second inlet does not meet the preset standard, the casting diverter is re-sized and steps two and three are repeatedly performed until the melt flow rate at the second inlet meets the preset standard.
Further, the casting shunt includes casing and baffle, and the baffle setting is in the casing in order to form first reposition of redundant personnel chamber and the second reposition of redundant personnel chamber of upper and lower distribution, and the top of casing has first import, is provided with first export and second export on the lateral wall of casing, and first export is located the top of baffle, and the second export is located the below of baffle, and the bottom of casing is provided with the second import, and step one specifically includes: step 101: obtaining the size of a casting cavity of the crystallizer, and calculating the depth of a liquid cavity in the casting cavity of the crystallizer according to the size of the casting cavity of the crystallizer; step 102: determining the length of the guide pipe according to the depth of the liquid cavity; step 103: and obtaining the flow rate of the melt at the first outlet, and calculating the flow areas of the first outlet and the second outlet according to the vertical cross-sectional area of the casting cavity of the crystallizer, the casting speed and the flow rate of the melt at the first outlet.
Further, the flow area of the first outlet is S1, the flow area of the second outlet is S2, the area of the vertical cross section of the casting cavity of the crystallizer is S3, the flow area at the first outlet is V1, the casting speed is V2, and the flow areas of the first outlet and the second outlet are calculated by the following formula;wherein S2 is 0.8 to 1.2 times that of S1.
Further, in the third step, if the melt flow rate at the second inlet does not meet the preset standard, the size of the casting diverter is redetermined, which specifically includes: when the flow rate of the melt at the second inlet is smaller than a preset standard, the flow area of the first outlet is reduced, or the length of the flow guide pipe is reduced; when the flow rate of the melt at the second inlet is greater than a preset standard, the flow area of the first outlet is increased, or the length of the flow guide pipe is increased.
By applying the technical scheme of the invention, in the casting process, after the melt enters the first diversion cavity from the first inlet, the melt can flow out of the first outlet rapidly, the flow of the melt near the first outlet can generate higher flow velocity, the second outlet adjacent to the first outlet can generate negative pressure according to Bernoulli's theorem, the melt in the liquid cavity of the casting cavity of the crystallizer can enter the second diversion cavity through the second inlet and flow back into the liquid cavity from the second outlet, so that the melt in the casting cavity of the crystallizer can be driven to flow through the natural flow of the melt in the casting process, the melt in the casting cavity is caused to perform convection, the macroscopic influence is further reduced, the quality of metal cast ingots is improved, and the performance of the product processed later is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 shows a schematic view of a cast diverter provided in accordance with a first embodiment of the present invention;
FIG. 2 shows a cross-sectional view of a cast diverter provided in accordance with a first embodiment of the present invention;
FIG. 3 shows a schematic view of a cast diverter provided in accordance with a second embodiment of the present invention;
FIG. 4 shows a schematic view of the effect of a casting diverter provided in accordance with an embodiment of the present invention in diverting a melt in a casting cavity of a mold;
FIG. 5 shows a flow field distribution diagram of a test set of a method for designing a cast shunt provided by the present invention;
FIG. 6 shows a flow field distribution diagram of a control group of the method for designing a cast shunt provided by the present invention.
Wherein the above figures include the following reference numerals:
100. a first shunt chamber; 110. a first inlet; 120. a first outlet;
200. a second shunt cavity; 210. a second inlet; 220. a second outlet;
10. a housing; 20. a partition plate; 30. a flow guiding pipe;
40. a first inlet pipe; 50. a first outlet pipe; 60. a second inlet pipe; 70. and a second outlet pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 4, a cast shunt is provided according to one aspect of the present invention, the cast shunt including a first shunt cavity 100 and a second shunt cavity 200. The first diversion cavity 100 has a first inlet 110 and a first outlet 120, which are oppositely disposed, the first inlet 110 is a melt inlet, the first inlet 110 is located at the top of the first diversion cavity 100, and the first outlet 120 is located on a sidewall of the first diversion cavity 100. Second split-flow chamber 200 the second split-flow chamber 200 is arranged independent of the first split-flow chamber 100, the second split-flow chamber 200 has a second inlet 210 and a second outlet 220 arranged opposite to each other, the second inlet 210 is arranged at the bottom of the second split-flow chamber 200, the first inlet 110 is arranged above the second inlet 210, the second outlet 220 is arranged on the side wall of the second split-flow chamber 200, the second inlet 210 is used for communicating with the bottom of the casting chamber of the crystallizer, and the second outlet 220 is arranged adjacent to the first outlet 120.
By applying the technical scheme of the invention, in the casting process, after the melt enters the first diversion cavity 100 from the first inlet 110, the melt can flow out of the first outlet 120 quickly, the flow of the melt near the first outlet 120 can generate higher flow velocity, the second outlet 220 adjacent to the first outlet 120 can generate negative pressure according to Bernoulli's theorem, the melt in the liquid cavity of the casting cavity of the crystallizer can enter the second diversion cavity 200 through the second inlet 210 and flow back into the liquid cavity from the second outlet 220, so that the melt in the casting cavity of the crystallizer can be driven to flow through the natural flow of the melt in the casting process, the melt in the casting cavity is caused to perform convection, the influence of macroscopic segregation is further reduced, the quality of a metal ingot is improved, and the performance of a product to be processed subsequently is improved.
Specifically, the first outlets 120 and the second outlets 220 are provided in plural, the plural first outlets 120 are symmetrically disposed on the first distribution chamber 100 with respect to the center of the first distribution chamber 100, and the first outlets 120 are disposed in one-to-one correspondence with the second outlets 220. Through the arrangement, the first outlets 120 and the second outlets 220 are arranged in a plurality, so that the melt can be convected through the first outlets 120 and the second outlets 220, the melt flow effect inside the liquid cavity is further improved, the difference of cooling speeds inside and outside the cast ingot is reduced, and the influence of macroscopic remote use is reduced. Specifically, the number of the first outlets 120 and the second outlets 220 may be 2, 4 or 6, and may be adjusted according to the specific ingot shape, so as to adapt to different ingot scenes.
Further, the flow area at the first outlet 120 is 0.8 to 1.2 times the flow area at the second outlet 220. When the ratio of the flow area at the first outlet 120 to the flow area at the second outlet 220 is less than 0.8, then the flow area at the second outlet 220 is too small to affect the flow effect of the melt at the second outlet 220; when the ratio of the flow area at the first outlet 120 to the flow area at the second outlet 220 is greater than 1.2, the flow area at the second outlet 220 is too large, and under the condition that the negative pressure at the second outlet 220 is unchanged, the flow area at the second outlet 220 is too large, so that the flow rate at the second outlet 220 is reduced, and the flow effect of the melt in the liquid cavity is reduced. Specifically, the flow area at the first outlet 120 may be set to be 0.8 times, 1.0 times, or 1.2 times the flow area at the second outlet 220.
Specifically, the flow direction of the second outlet 220 is parallel to the flow direction of the first outlet 120, and the end surface of the second inlet 210 is disposed in the horizontal direction. Through the arrangement, the circulation direction of the second outlet 220 is consistent with the circulation direction of the first outlet 120, so that the stable flow of the casting cavity liquid cavity melt is ensured, the possibility of turbulent flow of the melt in the liquid cavity is reduced, and the stability of melt flow in the casting process is ensured.
Further, a filter assembly is provided at the first outlet 120. Through the arrangement, the filtering structure can reduce the content of impurities and the content of oxides in the melt, and the material performance of the cast ingot is improved.
In particular, the filter assembly may be provided as a sieve.
As shown in fig. 2, in the first embodiment of the present application, the cast diverter includes a housing 10 and a partition 20, the partition 20 is disposed in the housing 10 to form a first diversion chamber 100 and a second diversion chamber 200 which are distributed up and down, a top of the housing 10 has a first inlet 110, a side wall of the housing 10 is provided with a first outlet 120 and a second outlet 220, the first outlet 120 is located above the partition 20, the second outlet 220 is located below the partition 20, and a bottom of the housing 10 is provided with a second inlet 210. Through the arrangement, the inner cavity of the shell 10 can be divided into the first flow dividing cavity 100 and the second flow dividing cavity 200 by the partition plate 20, so that the casting flow divider is convenient to process, when the proportion between the first outlet 120 and the second outlet 220 is required to be adjusted, the shell 10 is not required to be manufactured again, the position of the partition plate 20 in the shell is only required to be adjusted, and the casting flow divider is convenient to adjust according to production requirements.
Further, a flow guiding pipe 30 is arranged at the second inlet 210, and the flow guiding pipe 30 is communicated with the second inlet 210. Through the arrangement, the flow guide pipe 30 can penetrate into the bottom of the liquid cavity of the casting cavity, so that the negative pressure generated at the second outlet 220 can drive the melt at the bottom of the liquid cavity to perform convection, the effect of the casting flow divider on the flow of the fluid in the liquid cavity is improved, and macrosegregation is further reduced.
As shown in fig. 3, in the second embodiment of the present application, the cast diverter includes a first inlet pipe 40, a first outlet pipe 50, a second inlet pipe 60 and a second outlet pipe 70, the first inlet pipe 40 is mutually communicated with the first outlet pipe 50, the first inlet pipe 40 is located above the first outlet pipe 50, the end portion of the first inlet pipe 40 forms a first inlet 110, the end portion of the first outlet pipe 50 forms a first outlet 120, the second inlet pipe 60 is mutually communicated with the second outlet pipe 70, the second inlet pipe 60 is located below the second outlet pipe 70, the end portion of the second inlet pipe 60 forms a second inlet 210, the end portion of the second outlet pipe 70 forms a second outlet 220, and the first outlet pipe 50 is sleeved outside the second outlet pipe 70. Through the arrangement, the first outlet 120 can be arranged around the periphery of the second outlet 220, so that the suction effect of the negative pressure at the first outlet 120 on the melt at the second outlet 220 is improved, and the flow effect of the melt is further improved.
Further, the first inlet pipe 40 and the second inlet pipe 60 are coaxially arranged, the first outlet pipe 50 and the second outlet pipe 70 are coaxially arranged, and the first outlet pipe 50 and the second outlet pipe 70 are coaxially arranged. Through the arrangement, the circulation direction of the second outlet 220 is consistent with the circulation direction of the first outlet 120, the circulation direction of the second inlet 210 is consistent with the circulation direction of the first inlet 110, so that the stable flow of the casting cavity liquid cavity melt is ensured, the possibility of turbulent flow of the melt in the liquid cavity is reduced, and the macrosegregation of the cast ingot is further reduced.
According to another aspect of the present invention, there is provided a method for designing a casting shunt as described above, the method comprising the steps of: and obtaining the size of the casting cavity of the crystallizer, and determining the size of the casting shunt according to the size of the casting cavity of the crystallizer. Step two: and establishing a steady-state heat flow coupling model in the casting process according to the size of the casting cavity of the crystallizer, the size of the casting shunt and the casting process, and acquiring flow field distribution in the casting cavity of the crystallizer according to the steady-state heat flow coupling model. Step three: performing CFD analysis according to the flow field distribution, and if the melt flow rate at the second inlet 210 meets a preset standard, preparing a casting shunt according to the size of the casting shunt; if the melt flow rate at the second inlet 210 does not meet the predetermined criteria, the casting diverter is resized and steps two and three are repeated until the melt flow rate at the second inlet 210 meets the predetermined criteria.
According to the technical scheme, when the casting diverter provided by the application is required to be used for diverting the melt, through carrying out CFD analysis on the distribution of the flow field in the third step, the flow velocity of the melt at the second inlet 210 can be obtained, the flow condition of the melt in the liquid cavity can be judged according to the flow velocity of the melt at the second inlet 210, and the size of the casting diverter is adjusted according to the design schemes in the first step and the second step, so that the casting diverter can obtain a better effect of enabling the melt to flow, the using effect of the casting diverter is improved, macrosegregation in the casting process is reduced, and the product performance of an ingot is ensured.
Specifically, the casting diverter is the casting diverter of the first embodiment in the present application, where the casting diverter includes a flow guiding pipe 30, and step one specifically includes step 101: and obtaining the size of the casting cavity of the crystallizer, and calculating the depth of the liquid cavity in the casting cavity of the crystallizer according to the size of the casting cavity of the crystallizer. Step 102: the length of the draft tube 30 is determined based on the depth of the liquid pocket. Step 103: the melt flow rate at the first outlet 120 is obtained and the flow areas of the first outlet 120 and the second outlet 220 are calculated from the vertical cross-sectional area of the casting cavity of the mold, the casting speed and the melt flow rate at the first outlet 120.
Specifically, in step 101, the dimensions of the casting cavity of the mold are obtained, including the length L0 and the width W0 of the casting cavity of the mold, and according to the length L0 and the width W0 of the casting cavity of the mold, the length L1, the width W1, and the height H1 of the housing 10 may be determined, and specifically may be set: l1=l0/3, w1=w0/5,0.8W.ltoreq.h1.ltoreq.1.2W.
The liquid cavity depth H2 can be calculated according to the width W1 of the housing 10, and specifically can be set: 0.8H1 is less than or equal to H2 and is less than or equal to 1.2H1.
Specifically, in step 102, the length of the flow guiding tube 30 is H3, and the length H3 of the flow guiding tube 30 should be smaller than H2-H1, so as to prevent the second inlet 210 from directly contacting with the bottom of the liquid cavity, so as to ensure the flow guiding effect of the flow guiding tube 30, which can be specifically set: H2-H1 is greater than or equal to 0.1 and H3 is greater than or equal to 0.8 (H2-H1), and if H3 is less than 0.1 (H2-H1), the flow guide tube 30 cannot enter the liquid cavity, and cannot have a good flow guide effect on the melt in the liquid cavity; if H3 > 0.8 x (H2-H1), the draft tube 30 is too deep into the bottom of the cavity to achieve good flow guiding effect on the melt in the overall casting cavity. Specifically, h3=0.1 (H2-H1), h3=0.5 (H2-H1), or h3=0.8 (H2-H1) may be set to ensure that the second inlet 210 can be located in the middle of the liquid cavity, so as to improve the flow guiding capability of the casting diverter for the melt in the liquid cavity and enhance the flow property of the melt in the casting cavity.
Further, the flow area of the first outlet 120 is S1, the flow area of the second outlet 220 is S2, the vertical cross-sectional area of the casting cavity of the mold is S3, the flow rate of the melt at the first outlet 120 is V1, the casting speed is V2, and the first calculation is performed by the following formulaFlow area of one outlet 120 and second outlet 220:wherein S2 is 0.8 to 1.2 times that of S1. Specifically, the flow rate of the melt at the first outlet 120 may be set to be 0.3-0.5m/s, and when V1 is less than 0.3m/s, the speed of the melt entering the casting cavity is slower, and the negative pressure generated by the melt at the first outlet 120 on the melt at the second outlet 220 is smaller, so that the flow of the melt in the casting cavity is not facilitated; when V1 is larger than 0.5m/s, the speed of the melt entering the casting cavity is high, the casting cavity is not beneficial to the formation of the cast ingot, preferably, V1 can be set to be 0.5m/s, so that the casting cavity is ensured to have certain circulation performance while the casting cavity is ensured to have the casting ingot forming effect. Specifically, V1 may be set to 0.3m/s, 0.4m/s, and 0.5m/s.
In step three, if the melt flow rate at the second inlet 210 does not meet the preset criteria, the size of the cast diverter is re-determined, including, in particular, reducing the flow area of the first outlet 120 or reducing the length of the draft tube 30 when the melt flow rate at the second inlet 210 is less than the preset criteria; when the melt flow rate at the second inlet 210 is greater than a preset level, the flow area of the first outlet 120 is increased, or the length of the draft tube 30 is increased. Specifically, the melt flow rate at the second inlet 210 may be preset to be 0.05-0.2m/s to ensure that the melt within the liquid cavity can have a certain flow rate.
The design method provided by the invention is described in detail below in connection with control experiments.
Experimental group:
experimental group casting of 6050 aluminum alloy slab ingot with specification of 520X 1620mm, casting speed of 50mm/min and water quantity of 90m 3 And/h, the casting temperature is 600 ℃. Length l0=1620 mm of the casting cavity of the crystallizer, width w0=520 mm of the casting cavity of the crystallizer, and casting shunt using the casting shunt of the first embodiment of the present application, the casting shunt is sized according to step 101: l1=540 mm, w1=104 mm, h1=w1=104 mm, and the liquid pool depth H2 is calculated to be 500mm, h3=0.5× (H2-H1) =200 mm, and v1 is preset to be 0.5m/S, and s3=600 mm is calculated to be 2 . According to the upper partThe alloy composition, casting process parameters and the shunt bag structure are used for establishing a steady-state temperature field flow field coupling model in the casting process, obtaining flow field distribution in the casting cavity of the crystallizer according to the steady-state heat flow coupling model, performing CFD analysis, obtaining the flow field distribution as shown in figure 5, obtaining that the flow velocity of the melt at the second outlet 220 is 0.4m/S and exceeds 0.2m/S, and reducing the side outlet area S3 to 600mm 2 After the re-modeling calculation and analysis, the bottom suction melt speed was 0.2, the structure of the cast diverter was determined, the cast diverter of the specification was molded, the cast diverter was mounted to the casting platform, and baked and heated.
The alloy comprises the following main alloy elements in percentage by weight: 6.2% Zn, 2.0% Mg, 2.2% Cu, 0.1% Zr and 0.02% Ti. Melting the aluminum block, the Al-Cu intermediate alloy and the Al-Zr intermediate alloy in a smelting furnace, heating the Mg ingot to 730-750 ℃, measuring the components, finely adjusting the components to meet target components, transferring the melt into a standing furnace, heating a refining agent for refining, standing for 2 hours after slagging, sequentially passing through a degassing and filtering device, and adding an Al-Ti-C rod refiner on line. The melt is introduced into the casting diverter through the launder and the nozzle and flows into the bath from the first outlet 120 to achieve on-line continuous casting. The fluid with higher speed promotes the flow in the bottom cavity to realize the suction effect on the melt at the bottom of the liquid cavity, improves the flow field at the bottom of the liquid cavity, and simultaneously sucks the melt with low solute content at the bottom into the upper part of the liquid cavity so as to achieve the purpose of reducing segregation by repeated mixing.
After casting, sampling analysis is carried out on the cross section of the ingot, and the segregation degree of the ingot is evaluated, so that the result shows that the segregation degree of the main element Zn of the ingot is 5.1%, and the segregation degree of the large-size ingot is greatly reduced.
Control group:
the control group is a 6050 aluminum alloy slab ingot with the specification of 520X 1620mm, the casting speed is 50mm/min, the water quantity is 90m3/h, and the casting temperature is 600 ℃. The length of the inner cavity of the crystallizer is L0=1620 mm, the width of the inner cavity of the crystallizer is W0=520 mm, a conventional shunt bag in the prior art is adopted, the shunt bag is arranged on a casting platform, baking and heating are carried out, and the flow field distribution is shown in figure 6.
The alloy comprises the following main alloy elements in percentage by weight: 6.2% Zn, 2.0% Mg, 2.2% Cu, 0.1% Zr and 0.02% Ti. Melting aluminum blocks, al-Cu intermediate alloy and Al-Zr intermediate alloy in a smelting furnace, heating Mg ingots to 730-750 ℃, measuring fine tuning components, transferring the melt into a standing furnace, heating a refining agent for refining, standing for 2 hours after slagging off, sequentially passing through a degassing and filtering device, and adding an Al-Ti-C rod refiner on line. The melt flows into a molten pool through a launder and a casting nozzle through a shunt bag, so that online continuous casting is realized. After casting, sampling and analyzing the cross section of the ingot, and evaluating the segregation degree of the ingot, wherein the result shows that the segregation degree of the main element Zn of the ingot is 8.9%, and the center negative segregation of the ingot is serious.
According to the control experiment, the casting shunt provided by the invention can be used for remarkably reducing the segregation degree of cast ingots.
According to still another aspect of the present application, there is provided a metal casting method for splitting a melt using the casting split provided herein, the casting method specifically including: fixing the casting diverter on a casting platform, roasting and drying, and sequentially melting the alloy, finely adjusting the components, degassing and deslagging, standing, degassing and filtering, adding a refiner on line according to the ingredients of the alloy, and completing casting.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A cast shunt, the cast shunt comprising:
a first distribution chamber (100) having a first inlet (110) and a first outlet (120) arranged opposite to each other, the first inlet (110) being a melt inlet, the first inlet (110) being located at the top of the first distribution chamber (100), the first outlet (120) being located on a side wall of the first distribution chamber (100);
the second reposition of redundant personnel chamber (200), second reposition of redundant personnel chamber (200) with first reposition of redundant personnel chamber (100) mutually independent sets up, second reposition of redundant personnel chamber (200) have second import (210) and second export (220) of relative setting, second import (210) are located the bottom of second reposition of redundant personnel chamber (200), first import (110) are located the top of second import (210), second export (220) are located on the lateral wall of second reposition of redundant personnel chamber (200), second import (210) are used for the bottom intercommunication with the crystallizer casting chamber, second export (220) with first export (120) are adjacent to be set up.
2. The casting diverter according to claim 1, wherein a plurality of the first outlets (120) and the second outlets (220) are provided, the plurality of the first outlets (120) are arranged on the first diversion chamber (100) with the center symmetry of the first diversion chamber (100), and the first outlets (120) are arranged in one-to-one correspondence with the second outlets (220).
3. The cast diverter as in claim 1, wherein the flow area at the first outlet (120) is 0.8 to 1.2 times the flow area at the second outlet (220).
4. The casting diverter as recited in claim 1, characterized in that the flow direction of the second outlet (220) is arranged parallel to the flow direction of the first outlet (120), and the end face of the second inlet (210) is arranged in a horizontal direction.
5. The cast diverter as defined in claim 1, wherein a filter assembly is provided at the first outlet (120).
6. The casting diverter according to claim 1, characterized in that the casting diverter comprises a housing (10) and a partition (20), the partition (20) being arranged in the housing (10) to form the first and second diversion cavities (100, 200) distributed up and down, the top of the housing (10) having the first inlet (110), the side wall of the housing (10) being provided with the first and second outlets (120, 220), the first outlet (120) being located above the partition (20), the second outlet (220) being located below the partition (20), the bottom of the housing (10) being provided with the second inlet (210).
7. The casting diverter according to claim 6, characterized in that a flow guide pipe (30) is provided at the second inlet (210), the flow guide pipe (30) being in communication with the second inlet (210).
8. The cast shunt according to claim 1, characterized in that the cast shunt comprises a first inlet pipe (40), a first outlet pipe (50), a second inlet pipe (60) and a second outlet pipe (70), the first inlet pipe (40) is in communication with the first outlet pipe (50), the first inlet pipe (40) is located above the first outlet pipe (50), the end of the first inlet pipe (40) forms the first inlet (110), the end of the first outlet pipe (50) forms the first outlet (120), the second inlet pipe (60) is in communication with the second outlet pipe (70), the second inlet pipe (60) is located below the second outlet pipe (70), the end of the second inlet pipe (60) forms the second inlet (210), the end of the second outlet pipe (70) forms the second outlet (220), and the first outlet pipe (50) is sleeved outside the second outlet pipe (70).
9. The cast shunt according to claim 8, characterized in that said first inlet tube (40) is arranged coaxially with said second inlet tube (60), said first outlet tube (50) being arranged coaxially with said second outlet tube (70).
10. A method of designing a cast shunt, characterized in that the cast shunt is the cast shunt according to any one of claims 1 to 9, the method comprising:
step one: obtaining the size of a casting cavity of a crystallizer, and determining the size of the casting shunt according to the size of the casting cavity of the crystallizer;
step two: establishing a steady-state heat flow coupling model in the casting process according to the size of the casting cavity of the crystallizer, the size of the casting shunt and the casting process, and acquiring flow field distribution in the casting cavity of the crystallizer according to the steady-state heat flow coupling model;
step three: performing CFD analysis according to the flow field distribution, if the melt flow rate at the second inlet (210) meets a preset criterion, preparing the casting diverter according to the size of the casting diverter; if the melt flow rate at the second inlet (210) does not meet a predetermined criteria, the casting diverter is resized and steps two and three are repeated until the melt flow rate at the second inlet (210) meets a predetermined criteria.
11. The method of designing according to claim 10, wherein the casting shunt is the casting shunt according to claim 7, and the step one specifically includes:
step 101: acquiring the size of the casting cavity of the crystallizer, and calculating the depth of a liquid cavity in the casting cavity of the crystallizer according to the size of the casting cavity of the crystallizer;
step 102: determining the length of the guide pipe (30) according to the liquid cavity depth;
step 103: obtaining a melt flow rate at a first outlet (120), calculating a flow area of the first outlet (120) and the second outlet (220) based on a vertical cross-sectional area of a casting cavity of the crystallizer, a casting speed, and the melt flow rate at the first outlet (120).
12. The design method according to claim 11, characterized in that the flow area of the first outlet (120) is S1, the flow area of the second outlet (220) is S2, the area of the vertical cross section of the casting cavity of the crystallizer is S3, the flow velocity of the melt at the first outlet (120) is V1, the casting velocity is V2, the flow areas of the first outlet (120) and the second outlet (220) are calculated by the following formula;
wherein S2 is 0.8 to 1.2 times that of S1.
13. The method according to claim 12, wherein in step three, if the melt flow rate at the second inlet (210) does not meet a preset criterion, the sizing of the casting diverter is re-determined, in particular comprising:
reducing the flow area of the first outlet (120) or reducing the length of the draft tube (30) when the melt flow rate at the second inlet (210) is less than the preset standard;
when the melt flow rate at the second inlet (210) is greater than the preset criteria, the flow area of the first outlet (120) is increased, or the length of the draft tube (30) is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311618156.1A CN117548635A (en) | 2023-11-29 | 2023-11-29 | Casting shunt and design method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311618156.1A CN117548635A (en) | 2023-11-29 | 2023-11-29 | Casting shunt and design method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117548635A true CN117548635A (en) | 2024-02-13 |
Family
ID=89821642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311618156.1A Pending CN117548635A (en) | 2023-11-29 | 2023-11-29 | Casting shunt and design method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117548635A (en) |
-
2023
- 2023-11-29 CN CN202311618156.1A patent/CN117548635A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108300913A (en) | A kind of continuous casting and rolling process for production of 5356 aluminum alloy welding bar | |
| CN112317692B (en) | Pouring system for casting alloy standard sample and manufacturing method of formwork | |
| CN102021457A (en) | High-toughness aluminum lithium alloy and preparation method thereof | |
| CN207026463U (en) | A kind of automatic anti-slag of modified, aluminium alloy ingots pouring device of guaranteeing the quality | |
| CN101733373A (en) | Submerged nozzle for sheet billet continuous casting crystallizer | |
| CN207746384U (en) | A kind of alloy casting shunting purifier | |
| CN108262455A (en) | A kind of integrated reho-forming method for manufacturing high-quality semi-solid light alloy casting | |
| CN201979055U (en) | Horizontal continuous ingot casting crystallizer | |
| CN221388830U (en) | Casting diverter | |
| CN206593482U (en) | A kind of vaccum sensitive stove chute | |
| CN117548635A (en) | Casting shunt and design method thereof | |
| CN105358723B (en) | The method of aluminium alloy of the production comprising lithium | |
| CN209736576U (en) | Novel rotational flow downward casting device | |
| CN106929699B (en) | A kind of large volume high-alloying aluminium alloy melt treatment device and method | |
| CN107498001B (en) | Pouring cup device with electromagnetic purification treatment for continuous production of ductile iron casting mold | |
| CN203956074U (en) | Hot Metal in Beam Blank is submersed nozzle and arrangement thereof for casting | |
| CN106180606A (en) | One has core scolding tin bar continuous casting and extrusion system of processing and moulding process thereof | |
| CN106041042A (en) | Special-shaped stainless steel continuous casting tundish | |
| CN203030884U (en) | Multihole type immersive type water port for continuous casting | |
| CN206028672U (en) | There is core soldering tin rod to cast crowded system of processing in succession | |
| CN109482825A (en) | A kind of lower casting device | |
| CN210132028U (en) | Lower casting device | |
| CN203209685U (en) | Quasi-four-hole immersed nozzle for FTSC thin slab continuous casting crystallizer | |
| CN100391651C (en) | Technological method for producing iron bronze alloy strip plate by horizontal continuous casting method and its crystallizer | |
| CN112548055A (en) | Device and method for semi-continuous casting of ultra-wide aluminum alloy slab ingot |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |