CN113088842A - System and method for laminating alloy foils - Google Patents
System and method for laminating alloy foils Download PDFInfo
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- CN113088842A CN113088842A CN202110381061.7A CN202110381061A CN113088842A CN 113088842 A CN113088842 A CN 113088842A CN 202110381061 A CN202110381061 A CN 202110381061A CN 113088842 A CN113088842 A CN 113088842A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
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Abstract
The invention discloses an alloy foil laminating system which comprises a cutting device, a collecting and arranging device and a hot isostatic pressing device, wherein the cutting device is used for cutting an alloy foil; the device comprises a cutting device, a collecting and arranging device and a hot isostatic pressing device, wherein the cutting device is used for cutting the alloy foils into strips, the collecting and arranging device is used for collecting the strip-shaped alloy foils in a sealable container side by side, and the hot isostatic pressing device is used for carrying out hot isostatic pressing treatment on the sealed container.
Description
Technical Field
The invention relates to the field of metal manufacturing, in particular to an alloy foil laminating system and method.
Background
According to the Hall-Patch formula (Hall-Patch): sigma1＝σ0+K/d1/2，σ1Is the yield strength, σ, of the material0The yield strength of the single crystal, d is the grain size, and k is the characteristic constant of the material, and the above formula shows that the finer the grains are, the smaller the dendrite spacing is, the higher the yield strength is, and the higher the hardness is. Therefore, grain refining is the only method which can improve the strength and toughness of the alloy at present.
In addition to the improvement of strength and toughness, grain refining has other positive effects, such as marmorin (electrochemical performance of anode material for aluminum air battery prepared by rapid cooling, journal of material heat treatment, 2019.2, vol.40No.2) mentions that rapid cooling significantly reduces the alloy grain size from (60 + -14) μm to (3 + -2) μm, and simultaneously reduces the pitting corrosion and intercrystalline corrosion tendencies of the alloy, compared with as-cast alloy.
The most advanced rapid cooling techniques at present have two types:
one is represented by melt on single roll surface rapid cooling line, which can be used to prepare super aluminum alloy materials, such as RSA6061, which is a high quality optical grade application studied by Guido P.H. Gubbels (Rapid solid aluminum for optical applications, Proc. of SPIE Vol.701870183A-8), produced by RSP corporation of the Netherlands using single roll surface rapid cooling technology.
The other is represented by the atomization and deposition of molten mass into ingots, which can be used to prepare super aluminum alloys containing metal components with extremely high melting point temperature in the alloy formulation, such as silicon-aluminum alloys with silicon content as high as 50%, which are widely used in the manufacture of high-speed moving parts and aviation parts, and are represented by the model number CE50 aluminum alloy available from Sandvik company, sweden.
However, both RSP and Sandvik technologies present a risk of coarse crystallization; the RSP single-roller surface rapid cooling technology has the competition problem between centrifugal force and van der Waals force (between melt and a roller body), if the rotating speed of the roller body is too high, melt liquid drops can be directly thrown out by the centrifugal force, the thrown melt liquid drops cannot be rapidly cooled in protective gas, the risk of coarse crystallization exists, and if the rotating speed of the roller body is too low, the cooling speed of the roller body per se is reduced, so that the brought thermal residue can also cause the coarse crystallization of the alloy; in addition, because of the different wettability between the melt and the roller body of different alloy formulas (alloy types), different alloys finally have the problem of inconsistent degree on microcrystallization in order to balance the competition between centrifugal force and van der waals force in actual production, namely the grain size of the microcrystallization cannot be designed.
However, the process of Sandvik company is a process of atomized particle deposition (similar to 3D metal printing), so that for the preparation of a multi-alloy-component metal formula aluminum alloy, there is a high risk of dissimilarity of metal grains between a deposition layer and a deposition layer, the microscopic physical uniformity and component uniformity of an alloy material are difficult to be ensured, and the application range of the process is severely limited and is only suitable for the preparation of a two-component aluminum alloy material.
In addition, the fine-grained alloy foil produced may have a large grain growth during subsequent densification by hot isostatic pressing or the like.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to provide a method for restraining the ability of the microscopic grains of the final alloy product to grow in various cross sections (particularly cross sections).
In order to achieve the above object, the present invention provides in a first aspect an alloy foil lamination system comprising a cutting device, a collecting and arranging device, and a hot isostatic pressing device; the device comprises a cutting device, a collecting and arranging device and a hot isostatic pressing device, wherein the cutting device is used for cutting the alloy foils into strips, the collecting and arranging device is used for collecting the strip-shaped alloy foils in a sealable container side by side, and the hot isostatic pressing device is used for carrying out hot isostatic pressing treatment on the sealed container.
Further, the container is made of aluminum or aluminum alloy.
Further, the cold cutting device is a cutting wheel.
Further, the collecting and arranging device comprises a vibrating device with a horn-shaped feeding hole and an inclined cylindrical collecting device positioned below the vibrating device.
Furthermore, the peeling device is used for peeling the sealed container filled with the strip alloy foils after the hot isostatic pressing.
The invention provides an alloy foil laminating method in a second aspect, which comprises the following steps:
cutting the alloy foil into strips;
collecting the strip-shaped alloy foils in a sealable container side by side;
and sealing the container and then carrying out hot isostatic pressing treatment in a hot isostatic pressing device.
Further, the alloy foil strips are closely arranged within the sealable container.
Further, before the container is sealed, vacuum pumping is carried out, or protective gas is filled in the container firstly and then vacuum pumping is carried out.
Further, the sealed container filled with the strip-shaped alloy foil is peeled after being subjected to hot isostatic pressing, and the pressed compact alloy is obtained.
According to the invention, the alloy foil is cut into strips and packed in a pot in a equidirectional and close-packed manner (the arrangement direction of the strips in the invention is defined as the longitudinal direction, and the surface vertical to the longitudinal direction is defined as the section), so that the possible metal grain growth can be restrained in the longitudinal range to the maximum extent by utilizing the natural boundaries between the strips in the hot isostatic pressing process, thereby ensuring the physical consistency and the chemical consistency of each point of the whole section, and reducing the generation of alloy metal dendrites which are not beneficial to ultra-precision processing on the section.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic view of an alloy manufacturing apparatus in a preferred embodiment of the present invention;
fig. 2 shows two other embodiments of the cylindrical cooling roll of the present invention.
FIG. 3 is a schematic view of an alloy foil lamination system according to a preferred embodiment of the present invention
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
An embodiment of an alloy production apparatus according to the present invention is shown in fig. 1, and includes a cylindrical cooling roll 1. In the present embodiment, the cylindrical cooling roll 1 is a truncated cone having a small top and a large bottom, but in other embodiments, it may be a truncated cone or a cylinder having a large top and a small bottom as shown in fig. 2 (a) and (b). The cylindrical cooling roll 1 is provided with a support part 5 and a transmission part 2 with a gear. The cylindrical cooling roll 1 is provided obliquely on a frame 7 via a support part 5 and a support bearing 6, and the inclination angle thereof is adjustable. In the present embodiment, the inclination angle of the cylindrical cooling roll 1 is adjustable between 30 degrees and 60 degrees with respect to the vertical direction. The motor 10 drives the cylindrical cooling roller 1 to rotate through the matching of the transmission gear 11 and the transmission part 2, and the rotating speed of the cylindrical cooling roller is adjustable.
The cooling wall of the cylindrical cooling roller 1 is internally provided with a refrigerant flow channel 4, the roller body material can be copper but is not limited to copper, the cooling mode is water cooling but is not limited to water cooling, different from the prior art, the cooling surface of the cooling roller 1 is an inner wall surface 3 instead of a common outer wall surface, and the cooling position of the refrigerant is the inner wall surface 3 of the roller body.
Unlike the prior art, in the present embodiment, the pouring level of the nozzle 7 is set inside the roller body, and the alloy melt can be poured onto the inner wall surface 3 of the roller body from the top down.
The protective atmosphere device comprises a protective gas pipe 12, and a plurality of exhaust holes 13 are arranged on the protective gas pipe 12 and used for providing protective gas such as nitrogen or inert gas in the roller body.
When producing an alloy, the inclination angle and the rotation speed of the cylindrical cooling roll 1 are set as required, and while the cylindrical cooling roll 1 is rotated, the molten alloy 9 is poured onto the inner wall surface 3 from the top down through the pouring nozzle 7, so that the molten alloy is cooled, solidified and crystallized on the inner wall surface 3 to form a spiral alloy strip 9, and finally the alloy strip 9 falls from the lower end opening of the cylindrical cooling roll 1 onto the collecting tray 15 and is collected as an alloy foil 14. The producer controls the solidification time of the alloy melt by controlling the rotating speed and/or the inclination angle of the cylindrical cooling roller, thereby controlling the grain size of the alloy.
Because the melt is cooled on the inner wall of the single roller, the negative influence caused by centrifugal force when the melt rotates on the roller body does not need to be considered, the risk that protective gas is thrown into melt liquid drops to generate coarse crystals does not exist, the process step of selecting an intermediate product can be omitted, and the risk of defective products and the cost of a final product can be reduced at the same time; the centrifugal force of the melt in the rotation of the roller body ensures that the melt can form a foil solidified state and fully covers the inner wall of the whole roller body until the foil is fallen off, so that the production efficiency in unit time is higher than that of the traditional single-roller surface rapid cooling technology; because the melt is cooled on the inner wall of the single roller, the melt can be more tightly attached to the inner wall of the roller body due to the centrifugal force generated by the rotation of the roller body, so that the heat exchange efficiency between the melt and the roller body is higher, the energy conservation is facilitated, and the control of the solidification time is more accurately realized; because the time of the process that the melt is limited on the inner wall of the single roller to be rapidly cooled and solidified is consistent for each melt liquid drop, the grain growth time on the micro scale is consistent, the consistency of the final grain size of the alloy is ensured, and the physical properties of the final alloy at each mass point position can be the same on the macro scale; the speed of heat exchange can be correspondingly adjusted by adjusting the rotating speed of the roller body, the solidification time of the melt can be shortened or prolonged when the speed of heat exchange is increased or decreased, and the change of the solidification time can bring about the change of the grain growth time, so that the invention not only can obtain ultra-fine crystal and even amorphous alloy, but also can design the final grain size of the alloy on the premise of ensuring the microscopic uniformity and consistency of the alloy according to the requirements of end users.
Further, as shown in fig. 3, the alloy foil 14 prepared and collected in fig. 1 is sent to a cutting wheel 16 through a feeding conveyor 15 to be cut into alloy strips 22. Alloy strips 22 enter the vibrating device 23 through the feeding bell mouth 17, so that all the alloy strips 22 are adjusted to enter the first collecting conveyor belt 18 and the second collecting conveyor belt 19 by taking the length direction as the advancing direction, the first collecting conveyor belt 18 and the second collecting conveyor belt 19 are mutually spaced, the shorter alloy strips fall into the first collecting tank 20 and are arranged in the same direction, and the longer alloy strips 22 which enter the second collecting conveyor belt 19 fall into the second collecting tank 21 and are arranged in the same direction.
The first and second collection tanks 20 and 21 are preferably made of aluminum or an aluminum alloy.
And sealing the collecting tank 24 filled with the alloy strips 22 which are densely arranged in the same direction, vacuumizing or filling nitrogen and vacuumizing again, and then putting the alloy strips into a hot isostatic pressing machine 25 for hot isostatic pressing treatment. Alternatively, the alloy strip 22 may be removed and placed in another sealable container.
And peeling the collection tank after the hot isostatic pressing, and removing the external collection tank part to obtain the compacted densified alloy block.
It should be noted that the alloy foil pressing system shown in fig. 3 can be applied to the alloy foil manufactured by the alloy manufacturing apparatus shown in fig. 1 according to the present invention, and can also be applied to alloy foils manufactured by other processes.
In a preferred embodiment, the batch materials were weighed accurately according to the 6061 metal formula (Al si0.5% cu0.3% Mg 1%), charged to a melting furnace and heated to 1450 ℃ to produce a completely molten melt.
The obtained 6061 melt was fed into the alloy production apparatus shown in fig. 1 under the protection of a nitrogen atmosphere, and the rotation speed of the roller body of the cylindrical cooling roller 1 was set at 20rpm and the inclination angle was set at 45 degrees, followed by rapid cooling and solidification to obtain a6061 alloy foil 14. And (3) feeding the 6061 alloy foil 14 into an alloy foil laminating system in the figure 3, and carrying out hot isostatic pressing by a hot isostatic pressing machine 25 with the set parameters of 560 ℃, the pressure of 120MPa, the temperature rise of 2 hours, the heat preservation of 5 hours and the temperature reduction of 4 hours. And (3) peeling the 6061 aluminum can which is densified by hot isostatic pressing, and performing artificial aging treatment to obtain HSS-6061T 6.
In another preferred embodiment, the batch materials are accurately weighed according to the metal formula table of 4019 (Al Si 20% Fe 5% Ni 2%) and charged to a melting furnace and heated to 1500 ℃ to produce a melt that is completely molten.
The obtained 6061 melt was fed into the alloy production apparatus shown in fig. 1 under the protection of a nitrogen atmosphere, and the roller body of the cylindrical cooling roller 1 was rapidly cooled and solidified at a rotation speed of 20rpm and an inclination angle of 45 degrees, to obtain 4019 alloy foil 14. And (3) delivering the 4019 alloy foil 14 into the alloy foil pressing system in the figure 3, and carrying out hot isostatic pressing by a hot isostatic pressing machine 25 with the set parameters of 560 ℃, the pressure of 120MPa, the temperature rise of 2 hours, the heat preservation of 5 hours and the temperature reduction of 4 hours. The 4019 aluminum can after hot isostatic pressing densification is peeled, sent to an extrusion device for further densification, and extruded into HSS-4019 bar materials with different diameters.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. An alloy foil laminating system is characterized by comprising a cutting device, a collecting and arranging device and a hot isostatic pressing device; the device comprises a cutting device, a collecting and arranging device and a hot isostatic pressing device, wherein the cutting device is used for cutting the alloy foils into strips, the collecting and arranging device is used for collecting the strip-shaped alloy foils in a sealable container side by side, and the hot isostatic pressing device is used for carrying out hot isostatic pressing treatment on the sealed container.
2. The alloy foil lamination system of claim 1, wherein the container is aluminum or an aluminum alloy.
3. The alloy foil lamination system of claim 1, wherein the cutting device is a cutting wheel.
4. The alloy foil pressing system of claim 1, wherein the collecting and aligning device comprises a vibration device having a trumpet-shaped feed port and an inclined cylindrical collecting device located below the vibration device.
5. The alloy foil pressing system according to claim 1, further comprising a peeling device for peeling the hot isostatic pressed hermetic container containing the alloy strip foil.
6. An alloy foil laminating method is characterized by comprising the following steps:
cutting the alloy foil into strips;
collecting the strip-shaped alloy foils in a sealable container side by side;
and sealing the container and then carrying out hot isostatic pressing treatment in a hot isostatic pressing device.
7. The alloy foil laminating method of claim 6, wherein the alloy foils in the form of strips are closely arranged in the sealable container.
8. The alloy foil laminating method of claim 6, wherein the container is evacuated before sealing, or the container is evacuated after filling with a protective gas.
9. The alloy foil pressing method according to claim 6, wherein the sealed container containing the alloy foil strip is hot isostatic pressed and peeled to obtain the pressed alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110381061.7A CN113088842A (en) | 2021-04-09 | 2021-04-09 | System and method for laminating alloy foils |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110381061.7A CN113088842A (en) | 2021-04-09 | 2021-04-09 | System and method for laminating alloy foils |
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| CN113088842A true CN113088842A (en) | 2021-07-09 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108421980A (en) * | 2018-03-16 | 2018-08-21 | 华中科技大学 | A kind of hot isostatic pressing manufacturing process based on increasing material manufacturing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108421980A (en) * | 2018-03-16 | 2018-08-21 | 华中科技大学 | A kind of hot isostatic pressing manufacturing process based on increasing material manufacturing |
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