CN112080673A - Production process for improving conductivity of aluminum alloy plate - Google Patents
Production process for improving conductivity of aluminum alloy plate Download PDFInfo
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- CN112080673A CN112080673A CN202010958048.9A CN202010958048A CN112080673A CN 112080673 A CN112080673 A CN 112080673A CN 202010958048 A CN202010958048 A CN 202010958048A CN 112080673 A CN112080673 A CN 112080673A
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- 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
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/21—Presses specially adapted for extruding metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/003—Cooling or heating of work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
- B21C35/02—Removing or drawing-off work
- B21C35/03—Straightening the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
- B22D43/004—Retaining slag during pouring molten metal by using filtering means
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
-
- 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
Abstract
The invention belongs to the field of aluminum alloy manufacturing, and relates to a production process for improving the conductivity of an aluminum alloy plate, wherein aluminum alloy raw materials are proportioned according to the weight percentage, namely: si: 0.35-0.45%, Fe is less than or equal to 0.35%, Cu is less than or equal to 0.10%, Mn is less than or equal to 0.03%, Mg: 0.40-0.50%, Cr is less than or equal to 0.03%, Zn is less than or equal to 0.10%, Re: 0.25-0.30%, less than or equal to 0.05% of single impurities, less than or equal to 0.15% in total and the balance of Al, carrying out solution treatment on the extruded aluminum alloy section, wherein the heating temperature is 525 +/-5 ℃, the heat preservation time is 2 hours, the tensile strength, the yield strength and the elongation after fracture of the aluminum alloy section prepared by formula improvement and process improvement are similar to those of a 6-series aluminum section prepared by the prior art, and the electric conductivity reaches more than 57.6 MS/m; the conductivity is improved by 2.2 percentage points, and the performance requirements of high strength and high conductivity of the 6-series aluminum alloy plate can be met.
Description
Technical Field
The invention belongs to the field of aluminum alloy manufacturing, and relates to a production process for improving the conductivity of an aluminum alloy plate.
Background
6101 is a low alloyed Al-Mg-Si series conductive aluminum alloy. Such alloys have been widely used in the field of electrical conductivity because of their high specific strength, good electrical conductivity, corrosion resistance and formability. In order to meet increasingly stringent engineering requirements, conductive aluminum alloys need to have both high strength and good electrical conductivity. However, conventional methods for strengthening aluminum alloys, such as alloying, strain strengthening, precipitation strengthening, etc., all reduce the conductivity of the material by increasing the number of solid solution atoms of the alloying elements, introducing crystal defects (point defects, dislocations, grain boundaries, etc.), and producing high density precipitates, which enhance the scattering of conductive electrons. Therefore, high strength and high conductivity cannot be obtained in the conventional method of reinforcing conductive aluminum alloy.
Disclosure of Invention
In view of the above, the invention provides a production process for improving the conductivity of an aluminum alloy plate, in order to solve the problem that the high strength and the high conductivity of a 6-series aluminum alloy plate prepared by the existing extrusion production process cannot be simultaneously achieved.
In order to achieve the purpose, the invention provides a production process for improving the conductivity of an aluminum alloy plate, which comprises the following steps:
A. the aluminum alloy raw materials are proportioned according to the weight percentage, namely: si: 0.35-0.45%, Fe is less than or equal to 0.35%, Cu is less than or equal to 0.10%, Mn is less than or equal to 0.03%, Mg: 0.40-0.50%, Cr is less than or equal to 0.03%, Zn is less than or equal to 0.10%, Re: 0.25-0.30%, less than or equal to 0.05% of single impurity, less than or equal to 0.15% in total, and the balance of Al; placing the prepared aluminum alloy raw material into a smelting furnace to be smelted into liquid aluminum alloy, and casting the liquid aluminum alloy into aluminum alloy cast ingots after slagging-off and filtering;
B. homogenizing the aluminum alloy cast ingot, wherein the temperature of the homogenizing treatment is 450-500 ℃, and the heat preservation time is 10-20 h;
C. extruding the homogenized aluminum alloy cast ingot in an extruder to obtain a required aluminum alloy section, wherein the heating temperature of an extrusion die is 450-480 ℃, the heating temperature of the extrusion cast ingot is 400-420 ℃, the barrel body temperature of an extrusion barrel is 400-420 ℃, and the extrusion speed in the extrusion process is 16.0-17.0 m/min;
D. carrying out solution treatment on the extruded aluminum alloy section, wherein the heating temperature is 525 +/-5 ℃, and the heat preservation time is 2 h;
E. quenching the aluminum alloy profile subjected to the solution treatment in a water-through quenching mode, wherein the temperature of the aluminum alloy profile out of a quenching area is not more than 40 ℃;
E. stretching and straightening the quenched aluminum alloy section by a traction straightening machine, wherein the stretching deformation rate is 0.7-1.2%, standing the stretched and straightened aluminum alloy section for 2h, and then sizing and sawing;
F. and (3) carrying out artificial aging treatment on the aluminum alloy section after stretching and straightening, wherein the aging system is 205 +/-3 ℃ multiplied by 6h, so as to obtain the 6-series aluminum alloy section with high strength and high conductivity.
Further, step a dosing follows the following procedure: the method comprises the steps of putting ingredients into a smelting furnace in sequence for smelting, refining and covering by using a flux, stirring after the ingredients are put into the furnace until molten aluminum appears, refining and slagging off to obtain qualified components, and then bringing hydrogen and fine impurities in the molten aluminum to the surface by using a chlorine and argon mixed gas, so that the hydrogen content in the molten aluminum is reduced.
And further, filtering by using 40-50 ppi foamed ceramic plates and glass fiber cloth in the casting process of the aluminum alloy ingot casting in the step A, controlling the purity, and refining by using Al-Ti-B alloy, so that the grain size of the aluminum alloy ingot is ensured, and no pore, impurity and crack defects are caused in the aluminum alloy ingot casting.
And further, the temperature of homogenizing treatment of the aluminum alloy cast ingot in the step B is 480 ℃, and the heat preservation time is 15 h.
Further, the extruder in the step C is a horizontal 880T extruder.
And furthermore, the quenching cooling speed of the aluminum alloy section in the step E is 50-80 ℃/min.
And furthermore, the temperature of the aluminum alloy section after quenching in the step E is 20-30 ℃.
The invention has the beneficial effects that:
1. in the production process for improving the conductivity of the aluminum alloy plate, the resistivity of aluminum is increased along with the reduction of the purity of the aluminum, so that the content of alloy elements is higher and the resistivity is higher. Therefore, on the premise of ensuring the mechanical property, the contents of Mg, Si and the like are reduced. The addition of the rare earth element makes impurities in the aluminum alloy to be segregated to the spherical phase with high rare earth, so that the impurity elements at the finally solidified crystal boundary are greatly reduced, particularly the segregation amount of the rare earth in the spherical phase of the aluminum alloy is larger than that of pure aluminum, so that the rare earth is distributed on the crystal boundary of the aluminum alloy in a tiny way, the crystal boundary of the aluminum alloy added with the rare earth element is thinner and purer than that of the aluminum alloy without the rare earth element, the electron scattering is reduced, and the conductivity is improved.
2. According to the production process for improving the conductivity of the aluminum alloy plate, disclosed by the invention, the solution treatment temperature is higher than the recrystallization temperature, so that the crushed and distorted crystal grains are recrystallized in the solution treatment process after extrusion, the defects in the crystal grains are reduced, and the effects of reducing the electron scattering probability and improving the conductivity are achieved. Solution treatment causes grain growth, reduces the grain boundary area, and also increases the electrical conductivity, but at the same time, grain growth causes a reduction in the mechanical properties of the profile. Therefore, the size of the crystal grains is controlled by controlling the solid solution temperature and time, and the conductive performance and the mechanical performance which meet the requirements are obtained. Through multiple tests, the solid solution temperature and the solid solution time are determined to be 525 +/-5 ℃ multiplied by 2 h.
3. According to the production process for improving the conductivity of the aluminum alloy plate, the supersaturated solute atoms dissolved in the matrix can be separated out through aging treatment, the lattice distortion is reduced, the uniformity and the purity of the matrix are improved, and the scattering probability of electronic waves is reduced, so that the conductivity of the alloy can be improved. Through multiple tests, the aging system is determined to be 205 +/-3 ℃ multiplied by 6 h.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1
A production process for improving the conductivity of an aluminum alloy plate comprises the following steps:
A. calculating the use amount of each aluminum alloy raw material and preparing the aluminum alloy raw material according to the mixture ratio, wherein the 6-series aluminum alloy raw material comprises the following elements in percentage by mass:
| Si | Fe | Cu | Mn | Mg | Cr | Zn | Re | impurities | Al | |
| Content (wt.) | 0.35 | 0.35 | 0.10 | 0.03 | 0.40 | 0.03 | 0.10 | 0.25 | 0.06 | Balance of |
Adding the prepared aluminum alloy raw material into a smelting furnace, refining, online degassing, online filtering, smelting into liquid aluminum alloy, and casting the liquid aluminum alloy into an aluminum alloy ingot;
B. homogenizing the aluminum alloy cast ingot, wherein the temperature of the homogenizing treatment is 450-500 ℃, and the heat preservation time is 10-20 h;
C. extruding the homogenized aluminum alloy cast ingot in an extruder to obtain a required aluminum alloy section, wherein the heating temperature of an extrusion die is 450-480 ℃, the heating temperature of the extrusion cast ingot is 400-420 ℃, the barrel body temperature of an extrusion barrel is 400-420 ℃, and the extrusion speed in the extrusion process is 16.0-17.0 m/min;
D. carrying out solution treatment on the extruded aluminum alloy section, wherein the heating temperature is 525 +/-5 ℃, and the heat preservation time is 2 h;
E. quenching the aluminum alloy section after the solution treatment, wherein the quenching mode is water-through quenching, and the temperature of the aluminum alloy section out of a quenching area is not more than 180 ℃;
E. stretching and straightening the quenched aluminum alloy section by a traction straightening machine, wherein the stretching deformation rate is 0.7-1.2%, standing the stretched and straightened aluminum alloy section for 2h, and then sizing and sawing;
F. and (3) carrying out artificial aging treatment on the aluminum alloy section after stretching and straightening, wherein the aging system is 205 +/-3 ℃ multiplied by 6h, so as to obtain the 6-series aluminum alloy section with high strength and high conductivity.
Example 2
The difference between the embodiment 2 and the embodiment 1 is that the 6 series aluminum alloy raw materials in the step A comprise the following elements in percentage by mass:
| Si | Fe | Cu | Mn | Mg | Cr | Zn | Re | impurities | Al | |
| Content (wt.) | 0.45 | 0.35 | 0.10 | 0.03 | 0.50 | 0.03 | 0.10 | 0.30 | 0.06 | Balance of |
Example 3
The difference between the embodiment 3 and the embodiment 1 is that the mass percent ratio of each element of the 6 series aluminum alloy raw material in the step A is as follows:
| Si | Fe | Cu | Mn | Mg | Cr | Zn | Re | impurities | Al | |
| Content (wt.) | 0.40 | 0.35 | 0.10 | 0.03 | 0.45 | 0.03 | 0.10 | 0.28 | 0.06 | Balance of |
Comparative example
The difference between the comparative example and the example 1 is that the mass percent ratio of each element of the 6 series aluminum alloy raw material in the step A is as follows:
| Si | Fe | Cu | Mn | Mg | Cr | Zn | impurities | Al | |
| Content (wt.) | 0.35 | 0.35 | 0.10 | 0.03 | 0.40 | 0.03 | 0.10 | 0.06 | Balance of |
And sampling the aluminum alloy sections processed in the above examples 1-3 and comparative examples for mechanical property, conductivity and hardness detection. The mechanical property is tested according to GB/T16865 sampling; conductivity was measured according to GB/T12966 sampling; the results are shown in Table 1.
TABLE 1
As can be seen from Table 1, the comparison of the mechanical properties, the electrical conductivity and the hardness of the aluminum alloy sections prepared in the examples 1-3 and the comparative example shows that the tensile strength, the yield strength and the elongation after fracture of the aluminum alloy sections prepared by the formula improvement and the process improvement of the invention are all similar to those of the comparative example, and the electrical conductivity reaches more than 57.6 MS/m; compared with a comparative example, the conductivity of the alloy is improved by 2.2 percentage points, and the performance requirements of high strength and high conductivity of the 6-series aluminum alloy plate can be met.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (7)
1. A production process for improving the conductivity of an aluminum alloy plate is characterized by comprising the following steps:
A. the aluminum alloy raw materials are proportioned according to the weight percentage, namely: si: 0.35-0.45%, Fe is less than or equal to 0.35%, Cu is less than or equal to 0.10%, Mn is less than or equal to 0.03%, Mg: 0.40-0.50%, Cr is less than or equal to 0.03%, Zn is less than or equal to 0.10%, Re: 0.25-0.30%, less than or equal to 0.05% of single impurity, less than or equal to 0.15% in total, and the balance of Al; placing the prepared aluminum alloy raw material into a smelting furnace to be smelted into liquid aluminum alloy, and casting the liquid aluminum alloy into aluminum alloy cast ingots after slagging-off and filtering;
B. homogenizing the aluminum alloy cast ingot, wherein the temperature of the homogenizing treatment is 450-500 ℃, and the heat preservation time is 10-20 h;
C. extruding the homogenized aluminum alloy cast ingot in an extruder to obtain a required aluminum alloy section, wherein the heating temperature of an extrusion die is 450-480 ℃, the heating temperature of the extrusion cast ingot is 400-420 ℃, the barrel body temperature of an extrusion barrel is 400-420 ℃, and the extrusion speed in the extrusion process is 16.0-17.0 m/min;
D. carrying out solution treatment on the extruded aluminum alloy section, wherein the heating temperature is 525 +/-5 ℃, and the heat preservation time is 2 h;
E. quenching the aluminum alloy section after the solution treatment, wherein the quenching mode is water-through quenching, and the temperature of the aluminum alloy section out of a quenching area is not more than 180 ℃;
E. stretching and straightening the quenched aluminum alloy section by a traction straightening machine, wherein the stretching deformation rate is 0.7-1.2%, standing the stretched and straightened aluminum alloy section for 2h, and then sizing and sawing;
F. and (3) carrying out artificial aging treatment on the aluminum alloy section after stretching and straightening, wherein the aging system is 205 +/-3 ℃ multiplied by 6h, so as to obtain the 6-series aluminum alloy section with high strength and high conductivity.
2. The production process for improving the conductivity of the aluminum alloy plate as claimed in claim 1, wherein the step A batching follows the following process: the method comprises the steps of putting ingredients into a smelting furnace in sequence for smelting, refining and covering by using a flux, stirring after the ingredients are put into the smelting furnace when molten aluminum appears in the furnace, refining and slagging off to obtain qualified components, and then bringing hydrogen and fine impurities in molten aluminum to the surface by using a chlorine and argon mixed gas, so that the hydrogen content in the molten aluminum is reduced.
3. The production process for improving the conductivity of the aluminum alloy plate according to claim 2, wherein in the step A, the aluminum alloy ingot casting process is carried out by filtering with 40-50 Ppi foamed ceramic plates and glass fiber cloth, controlling the purity, and carrying out refining treatment with Al-Ti-B alloy, so that the grain size of the aluminum alloy ingot is ensured, and no air holes, impurities or crack defects are caused in the aluminum alloy ingot.
4. The production process for improving the conductivity of the aluminum alloy sheet according to claim 3, wherein the homogenization treatment temperature of the aluminum alloy ingot in the step B is 480 ℃, and the holding time is 15 h.
5. The process for improving the conductivity of aluminum alloy plates according to claim 4, wherein the extruder in the step C is a horizontal 880T extruder.
6. The production process for improving the conductivity of the aluminum alloy plate as claimed in claim 5, wherein the quenching cooling speed of the aluminum alloy section in the step E is 50-80 ℃/min.
7. The production process for improving the conductivity of the aluminum alloy plate as claimed in claim 6, wherein the temperature of the aluminum alloy section after quenching in the step E is 20-30 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112853173A (en) * | 2020-12-31 | 2021-05-28 | 山东裕航特种合金装备有限公司 | Rhenium element-added heat-resistant aluminum alloy and preparation method and application thereof |
| CN113528900A (en) * | 2021-07-20 | 2021-10-22 | 中铝瑞闽股份有限公司 | Short-process high-conductivity 6-series aluminum alloy plate strip and preparation method thereof |
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| CN110983124A (en) * | 2019-12-26 | 2020-04-10 | 营口忠旺铝业有限公司 | High-conductivity 6-series aluminum alloy and production process thereof |
| CN111485150A (en) * | 2020-06-09 | 2020-08-04 | 天津忠旺铝业有限公司 | Preparation method of high-conductivity aluminum alloy plate strip |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106929718A (en) * | 2017-04-06 | 2017-07-07 | 辽宁忠旺集团有限公司 | A kind of wind-power electricity generation aluminium-alloy pipe bus group preparation technology |
| CN110983124A (en) * | 2019-12-26 | 2020-04-10 | 营口忠旺铝业有限公司 | High-conductivity 6-series aluminum alloy and production process thereof |
| CN111485150A (en) * | 2020-06-09 | 2020-08-04 | 天津忠旺铝业有限公司 | Preparation method of high-conductivity aluminum alloy plate strip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112853173A (en) * | 2020-12-31 | 2021-05-28 | 山东裕航特种合金装备有限公司 | Rhenium element-added heat-resistant aluminum alloy and preparation method and application thereof |
| CN113528900A (en) * | 2021-07-20 | 2021-10-22 | 中铝瑞闽股份有限公司 | Short-process high-conductivity 6-series aluminum alloy plate strip and preparation method thereof |
| CN113528900B (en) * | 2021-07-20 | 2022-05-27 | 中铝瑞闽股份有限公司 | Short-process high-conductivity 6-series aluminum alloy plate strip and preparation method thereof |
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Application publication date: 20201215 |