CN110135073B - Ultrahigh-strength aluminum alloy pulse current regulation casting and rolling simulation method - Google Patents
Ultrahigh-strength aluminum alloy pulse current regulation casting and rolling simulation method Download PDFInfo
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Abstract
A casting and rolling simulation method for ultra-high strength aluminum alloy pulse current regulation relates to a casting and rolling simulation method, which comprises the following steps: collecting electric pulse technical parameters in the casting and rolling process on site; collecting various technological parameters of a casting and rolling process and a melt solidification area on site; establishing a finite element three-dimensional dynamic casting and rolling model according to the division of the unit grids; simulating the rheological and electromagnetic induction stirring of a melt solidification area by combining electromagnetic induction characteristics; obtaining electromagnetic stirring intensity under different casting and rolling technological parameters, and calculating the temperature change difference of the melt in the rheological region in a simulation manner; obtaining a critical solid phase rate at a solidification interface, wherein the melt can flow; changing the electric pulse technical parameters in the casting and rolling process; simulating the rheological condition and electromagnetic induction distribution condition of the cast-rolling alloy under pulse regulation; the simulation method is applied to the optimization of aluminum alloy plate blanks under different specifications, equipment and technical parameters thereof, and is suitable for casting and rolling processes of ultra-high strength aluminum alloy melt current regulation and control and plate blank products meeting the use conditions.
Description
Technical Field
The invention relates to a casting and rolling simulation method for ultra-high-strength aluminum alloy pulse current regulation, in particular to a casting and rolling simulation method.
Background
The additive elements of the ultrahigh-strength aluminum alloy mainly consist of magnesium, zinc, copper, a small amount of chromium, manganese, titanium and the like. The room temperature strength can reach 600-800 mpa, and is the highest strength aluminum alloy at present. The alloy is widely used as a base material commonly used in the light weight of large structural parts in the fields of aerospace, rail transit, civil automobiles and the like. Zinc and magnesium are main strengthening elements, copper has the functions of supplementing strengthening and improving stress corrosion resistance, and manganese and chromium can improve the artificial aging strengthening effect. So that the total content of the alloy elements can reach more than 13 percent. Therefore, the alloy has the characteristics of multiple components, high components and the like, so that the defects of large solidification temperature difference, extremely easy segregation and the like are caused. When serious, the product has organization delamination, failure and the like. The control of the diffusion and uniform distribution of alloy elements in the solidification process is a main means for optimizing the structure of the product and improving the performance of the product.
The conventional casting-hot rolling cogging-hot continuous rolling working procedures of the ultra-high strength aluminum alloy plate have the defects of high production cost, difficult control, serious segregation, environmental pollution and the like; the conventional casting and rolling process has the defects of slab tissue segregation, high technical difficulty and the like. Therefore, pulse current is introduced in the casting and rolling process, so that the diffusion capacity of alloy elements can be effectively controlled and improved, the solidification structure is refined, and the mechanical properties of the slab are optimized and improved. Because the pulse current has the advantages of strong oscillation, environmental protection, reproducibility and the like, the pulse current can be used as an equipment accessory for continuous production of a casting and rolling machine, so that the slab product of the ultra-high strength aluminum alloy plays an important role in a plurality of technical fields.
The solid phase ratio is the ratio of the solid phase region in the solid-liquid two-phase region to the total solidification region, and is an index for judging the internal shrinkage flow capacity of the alloy melt. It is generally considered that the solid phase ratio in the casting and rolling process reaches more than 10%, and the melt does not have flowability during solidification and shrinkage. Under the action of electromagnetic stirring, the flow capacity of the melt is greatly improved, the diffusion is sufficient, and the structure is refined. So that intense electromagnetic stirring can affect the whole area of the slab cross section.
Disclosure of Invention
The invention aims to provide a simulation method for ultra-high-strength aluminum alloy pulse current regulation and control casting and rolling, which is a simulation method for electromagnetic induction of pulse current in the casting and rolling process of an aluminum alloy melt.
The invention aims at realizing the following technical scheme:
an ultra-high strength aluminum alloy pulse current regulation casting and rolling simulation method comprises the following steps: collecting electric pulse technical parameters in the casting and rolling process on site; collecting various technological parameters of a casting and rolling process and a melt solidification area on site; dividing the solidification area into unit grids; carrying out three-dimensional finite element analysis based on various technological parameters by utilizing finite element simulation software, and establishing a finite element three-dimensional dynamic casting and rolling model according to the division of unit grids; simulating the rheological and electromagnetic induction stirring of a melt solidification area by combining electromagnetic induction characteristics; obtaining electromagnetic stirring intensity under different casting and rolling technological parameters, and calculating the temperature change difference of the melt in the rheological region in a simulation manner; obtaining a critical solid phase rate at a solidification interface, wherein the melt can flow; changing the electric pulse technical parameters in the casting and rolling process; simulating the rheological condition and electromagnetic induction distribution condition of the cast-rolling alloy under pulse regulation;
by the finite element simulation electromagnetic induction casting and rolling method, electric pulse parameters are optimized aiming at electromagnetic induction simulation and critical solid phase rate change conditions with different pulse current parameters; and thereby improving the local flow condition of the melt in the solidification process, improving the diffusion capability of the alloy elements, reducing the segregation degree of the alloy elements at different areas of the slab and improving the segregation defect of the core of the slab.
The pulse-controlled casting and rolling simulation method for the ultra-high-strength aluminum alloy pulse current comprises the characteristics of ultra-high-strength aluminum alloy materials, current distribution characteristics, electromagnetic induction distribution characteristics and casting and rolling speed characteristics.
According to the ultra-high-strength aluminum alloy pulse current regulation casting-rolling simulation method, the melt obtained through simulation can flow the slab size parameter determined by the critical solid phase difference; in this way, by adjusting the pulse frequency, duty cycle and pulse current intensity of the pulse current, the electromagnetic induction intensity and distribution in the melt solidification process can be effectively controlled; the hot rheological state of the melt is regulated and controlled by adjusting the casting and rolling speed, and the electromagnetic stirring strength is matched, so that the critical solid phase rate of the melt in the solidification area, which can flow, is improved, the alloy element diffusion capacity is further improved, and the segregation defect is reduced.
The pulse current introduction device is a key component for forming the size of an aluminum alloy cast-rolling plate blank, and the pulse current waveform and the current peak intensity play a vital role in refining alloy tissues, homogenizing alloy components and ensuring the quality and performance of the cast-rolling plate blank; the introduction device has a circular cross section and a cylindrical body, and the pulse current introduction device determines the introduction position according to the distribution of electromagnetic induction obtained by the pulse electromagnetic casting-rolling simulation method.
The ultra-high-strength aluminum alloy pulse current regulation casting-rolling simulation method is characterized in that a device for pulse introduction into an alloy melt solidification zone in the casting-rolling process is adopted, wherein a boron nitride ceramic insulating film is coated on the side surface of the pulse current introduction device, and the core of the pulse current introduction device is provided with an arc chamfer.
The pulse current regulation and control casting-rolling simulation method for the ultra-high-strength aluminum alloy comprises the step of introducing the pulse current into the device, wherein the diameter of the cross section of the pulse current introducing device is 3mm.
The ultra-high strength aluminum alloy pulse current regulation casting and rolling simulation method is applied to ultra-high strength aluminum alloy casting and rolling slabs and is formed according to the pulse current introduction device and the optimized conditions of the electromagnetic regulation casting and rolling simulation.
The invention has the advantages and effects that:
1. according to the invention, the three-dimensional electromagnetic regulation casting-rolling model is established, so that the cost of verifying the casting-rolling production real object is greatly reduced;
2. according to the invention, through introducing electric pulses with proper waveforms and current intensity, the internal quality and the service performance of the high-strength aluminum alloy cast-rolling slab are obviously improved, and the method is suitable for the service conditions of serving as base materials in the fields;
3. the invention improves the electromagnetic induction condition of the melt solidification process by adjusting the material and the shape of the pulse introducing device. The plate blank finished product is suitable for mass production;
4. the invention is easy to realize, has no influence on the existing casting and rolling process, and can be widely applied to the existing casting and rolling production of various aluminum alloy materials, working procedures after heat treatment and the like.
Drawings
FIG. 1 is a top view of a pulse current introduction method and apparatus according to the present invention;
fig. 2 is a schematic diagram of a pulse current introducing method and apparatus according to the present invention.
In the figure: reference numeral 1 is roll cooling water; 2 is a casting roller; 3 is a cast-rolled plate product; 4 is an electrode; 5, casting and rolling the mouth side seal; 6 is a cast-rolling heat insulation plate; 7 is a pulse power supply; 8 is an aluminum alloy melt casting inlet; 9 is a melt standing container; 10 is a casting mill stand.
Detailed Description
The present invention will be described in detail with reference to the embodiments shown in the drawings.
The invention improves the technology and the product quality of the ultra-high strength aluminum alloy cast-rolled plate blank, and improves the critical flow solid phase rate of the melt in the plate blank molding solidification, thereby improving the segregation, refining the structure and improving the quality and the performance of the alloy product.
To this end, in one aspect of the present invention, a method for simulating a pulse current cast-rolling slab of 7075 ultra-high strength aluminum alloy is provided. Wherein the simulation method comprises the following steps: collecting electric pulse technical parameters in the casting and rolling process on site; collecting various technological parameters of a casting and rolling process and a melt solidification area on site; dividing the solidification area into unit grids; carrying out three-dimensional finite element analysis based on various technological parameters by utilizing finite element simulation software, and establishing a finite element three-dimensional dynamic casting and rolling model according to the division of unit grids; simulating the rheological and electromagnetic induction stirring of a melt solidification area by combining electromagnetic induction characteristics; obtaining electromagnetic stirring intensity under different casting and rolling technological parameters, and calculating the temperature change difference of the melt in the rheological region in a simulation manner; obtaining a critical solid phase rate at a solidification interface, wherein the melt can flow; changing the electric pulse technical parameters in the casting and rolling process; simulating the rheological condition and electromagnetic induction distribution condition of the cast-rolling alloy under pulse regulation.
By the finite element simulation electromagnetic induction casting and rolling method, electric pulse parameters are optimized aiming at electromagnetic induction simulation and critical solid phase rate change conditions with different pulse current parameters. And thereby improving the local flow condition of the melt in the solidification process, improving the diffusion capability of the alloy elements, reducing the segregation degree of the alloy elements at different areas of the slab and improving the segregation defect of the core part of the slab.
In certain preferred embodiments, the pulse modulated casting process characteristics include ultra high strength aluminum alloy material characteristics, current distribution characteristics, electromagnetic induction distribution characteristics, and casting speed characteristics. The melt obtained by simulation can flow the slab size parameter determined by the critical solid phase rate difference. In this way, by adjusting the pulse frequency, duty cycle and pulse current intensity of the pulse current, the electromagnetic induction intensity and distribution in the melt solidification process can be effectively controlled; the hot rheological state of the melt is regulated and controlled by adjusting the casting and rolling speed, and the electromagnetic stirring strength is matched, so that the critical solid phase rate of the melt in the solidification area, which can flow, is improved, the alloy element diffusion capacity is further improved, and the segregation defect is reduced.
The pulse current introducing device is a key component for forming the size of the cast-rolling plate blank of the aluminum alloy, and the pulse current waveform and the current peak intensity play a vital role in refining alloy tissues, homogenizing alloy components and ensuring the quality and performance of the cast-rolling plate blank.
According to another aspect of the present invention, an apparatus for pulse introducing into a solidification zone of an alloy melt during casting is provided. Wherein the introducing device has a circular cross section and a cylindrical body, and the pulse current introducing device determines the introducing position according to the distribution of electromagnetic induction obtained by the pulse electromagnetic casting-rolling simulation method.
In certain preferred embodiments, the pulse current introducing means side surface is coated with a boron nitride ceramic insulating film, and the pulse current introducing means core has an arc chamfer. Preferably, the cross-sectional diameter of the pulse current introducing means is 3mm.
According to another aspect of the invention, there is also provided a casting and rolling slab under the pulse electromagnetic control of the ultra-high-strength aluminum alloy, wherein the ultra-high-strength aluminum alloy casting and rolling slab is molded according to the pulse current introducing device and the optimized conditions of the electromagnetic control casting and rolling simulation.
In order to optimize the electric pulse technical parameters introduced in the casting and rolling process, avoid the defects of slab tissue segregation, coarse grains and the like, improve the quality and the service performance of cast-rolled slab products, the invention provides a pulse current regulated casting and rolling model which is used for determining the parameter design process of the ultra-high strength aluminum alloy cast-rolled slab. In the simulation method of the pulse electromagnetic cast-rolling slab of the ultra-high-strength aluminum alloy. Collecting electric pulse technical parameters of a casting and rolling process according to a production site; and simultaneously collecting various technological parameters of the casting and rolling process and a melt solidification area. The characteristics of the ultra-high strength aluminum alloy material, the electromagnetic induction and distribution characteristics and the casting and rolling speed characteristics are respectively considered. And establishing a finite element three-dimensional pulse current casting-rolling model aiming at the influence of the division rule of the grid unit of the solidification area on the casting-rolling result. Simulating the rheology and electromagnetic stirring of a melt solidification area by combining electromagnetic induction characteristics; simulating and calculating the temperature variation difference of the melt in the rheological region; obtaining a critical solid phase rate at a solidification interface, wherein the melt can flow; simulating different electric pulse technical parameters in the casting and rolling process by using the model; thereby adjusting the casting and rolling speed according to electromagnetic induction and distribution, effectively improving the diffusion capacity of the alloy in the solidification process and improving segregation.
FIG. 1 is a top view of a pulse current introduction method and apparatus according to the present invention; fig. 2 is a schematic diagram of a pulse current introducing method and apparatus according to the present invention. In fig. 1, reference numeral 1 is roll cooling water; 2 is a casting roller; 3 is a cast-rolled plate product; 4 is an electrode; 5, casting and rolling the mouth side seal; 6 is a cast-rolling heat insulation plate; 7 is a pulse power supply; 8 is an aluminum alloy melt casting inlet. In fig. 2, reference numeral 1 is roll cooling water; 2 is a casting roller; 3 is a cast-rolled plate product; 4 is an electrode; 6 is a cast-rolling heat insulation plate; 7 is a pulse power supply; 8 is an aluminum alloy melt casting inlet; 9 is a melt standing container; 10 is a casting mill stand.
The casting roller 2, the casting nozzle side seal 5 and the casting heat insulation plate 6 are jointly used for rheoforming a casting plate product 3 of an aluminum alloy melt, the aluminum alloy melt is solidified at the surface of the casting roller 2 firstly through the cooling effect of the casting roller cold area water 1, and a solidification layer is quickly thickened along with time until the plate blank product 3 is formed. According to the invention, the existing casting and rolling device and casting process are not required to be changed, the casting and rolling nozzle side seal 5 is improved to be a side seal tip end processing through hole and an electrode 4 is inserted, the electrode 4 directly contacted with the melt end slightly protrudes out of the inner surface of the side seal 5, and the side surface of the electrode is coated with a BN insulating coating. The other end of the electrode 4 is directly connected with a pulse power supply 7 through a wire. In a preferred embodiment, the waveform, the current intensity, the rotational speed of the casting rolls 2, etc. of the pulse current generated by the pulse power source 7 are variable process parameters. In this way, the invention can introduce the required pulse current in the casting and rolling process and generate strong electromagnetic oscillation effect in the melt by properly adjusting the casting and rolling process parameters based on the existing casting and rolling machine equipment. Further improves the diffusion capability of the alloy elements, reduces the segregation degree of the alloy elements in the cast-rolling slab until the segregation defect is eliminated and the slab structure is thinned. Therefore, the pulse current introduction mode can flexibly adjust current parameters according to the needs, cast and roll the ultrahigh-strength aluminum alloy with different specifications and brands, greatly improve the quality and efficiency of cast and rolled products and greatly save the cast and rolled cost.
According to the invention, by establishing a three-dimensional electromagnetic regulation casting-rolling model and combining electromagnetic induction distribution conditions, optimized pulse technical parameters and casting-rolling technological parameters are obtained. And further improves the existing casting and rolling equipment to improve the internal segregation defect of the alloy plate blank and improve the quality and performance of the alloy plate blank. The invention greatly reduces the cost of verifying the cast-rolling production entity; the method is easy to realize, has no influence on the existing casting and rolling process, and can be widely applied to the existing casting and rolling production of various aluminum alloy materials, the working procedures of heat treatment post-processing and the like.
The foregoing has outlined the basic principles, main technical features and technical advantages of the present invention. Various changes and modifications to the disclosed technical features and embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, which is intended to fall within the scope of the invention. The above description of embodiments is illustrative and not restrictive, the scope of the invention being indicated by the claims.
Claims (5)
1. The ultra-high strength aluminum alloy pulse current regulation casting and rolling simulation method is characterized by comprising the following steps of: collecting electric pulse technical parameters in the casting and rolling process on site; collecting various technological parameters of a casting and rolling process and a melt solidification area on site; dividing the solidification area into unit grids; carrying out three-dimensional finite element analysis based on various technological parameters by utilizing finite element simulation software, and establishing a finite element three-dimensional dynamic casting and rolling model according to the division of unit grids; simulating the rheological and electromagnetic induction stirring of a melt solidification area by combining electromagnetic induction characteristics; obtaining electromagnetic stirring intensity under different casting and rolling technological parameters, and calculating the temperature change difference of the melt in the rheological region in a simulation manner; obtaining a critical solid phase rate at a solidification interface, wherein the melt can flow; changing the electric pulse technical parameters in the casting and rolling process; simulating the rheological condition and electromagnetic induction distribution condition of the cast-rolling alloy under pulse regulation;
by the finite element simulation electromagnetic induction casting and rolling method, electric pulse parameters are optimized aiming at electromagnetic induction simulation and critical solid phase rate change conditions with different pulse current parameters; the local flow condition of the melt in the solidification process is improved, the diffusion capacity of alloy elements is improved, the segregation degree of the alloy elements in different areas of the slab is reduced, and the segregation defect of the core part of the slab is improved;
the characteristics of the pulse-controlled casting and rolling comprise ultrahigh-strength aluminum alloy material characteristics, current distribution characteristics, electromagnetic induction distribution characteristics and casting and rolling speed characteristics;
the pulse current introduction device is a key component for forming the size of the cast-rolled plate blank of the aluminum alloy, and the pulse current waveform and the current peak intensity play a vital role in refining alloy tissues, homogenizing alloy components and ensuring the quality and performance of the cast-rolled plate blank; the introduction device has a circular cross section and a cylindrical body, and the pulse current introduction device determines the introduction position according to the distribution of electromagnetic induction obtained by the pulse electromagnetic casting-rolling simulation method.
2. The ultra-high strength aluminum alloy pulse current controlled casting and rolling simulation method according to claim 1, wherein the slab size parameter is determined by obtaining the difference of critical solid phase rate at which the melt can flow at the solidification interface; in this way, by adjusting the pulse frequency, duty cycle and pulse current intensity of the pulse current, the electromagnetic induction intensity and distribution in the melt solidification process can be effectively controlled; the hot rheological state of the melt is regulated and controlled by adjusting the casting and rolling speed, and the electromagnetic stirring strength is matched, so that the critical solid phase rate of the melt in the solidification area, which can flow, is improved, the alloy element diffusion capacity is further improved, and the segregation defect is reduced.
3. The ultra-high strength aluminum alloy pulse current regulated casting and rolling simulation method according to claim 1, wherein the casting and rolling process pulses are introduced into an alloy melt solidification zone device, wherein the side surface of the pulse current introduction device is coated with a boron nitride ceramic insulating film, and the core of the pulse current introduction device is provided with an arc chamfer.
4. The ultra-high strength aluminum alloy pulse current regulation casting and rolling simulation method according to claim 1, wherein the cross section diameter of the pulse current introducing device is 3mm.
5. The method for simulating ultra-high-strength aluminum alloy pulse current controlled casting and rolling according to claim 1, wherein the method is applied to ultra-high-strength aluminum alloy casting and rolling slabs and is molded according to the pulse current introducing device and the optimized conditions of the electromagnetic controlled casting and rolling simulation.
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Application publication date: 20190816 Assignee: Tiedong District Yangtong Material Business Department Assignor: SHENYANG University Contract record no.: X2023210000183 Denomination of invention: A Simulation Method for Pulse Current Controlled Casting and Rolling of Ultra High Strength Aluminum Alloy Granted publication date: 20230616 License type: Exclusive License Record date: 20231121 |