CN111961890A - Production process method of section bar for high-conductivity and high-strength aluminum alloy electrical equipment - Google Patents
Production process method of section bar for high-conductivity and high-strength aluminum alloy electrical equipment Download PDFInfo
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- CN111961890A CN111961890A CN202010940054.1A CN202010940054A CN111961890A CN 111961890 A CN111961890 A CN 111961890A CN 202010940054 A CN202010940054 A CN 202010940054A CN 111961890 A CN111961890 A CN 111961890A
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- 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
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- 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
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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
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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
- C22F1/002—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
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/023—Alloys based on aluminium
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Abstract
The invention discloses a production process method of a section for high-conductivity and high-strength aluminum alloy electrical equipment, wherein the melting temperature is controlled to be 710-; the surface quality and the metallographic structure of the cast rod can reach the requirement of above grade II of YS/T67 by adopting the equal-level hot-top semi-continuous casting; through a homogenizing process, the segregation of the components of the cast bar structure is eliminated, and the cast bar is used for stabilizing the metallographic structure of the cast bar; molding by an extrusion process, wherein the rod temperature in the extrusion process is 510-530 ℃, the cylinder temperature is 380-420 ℃, the mold temperature is 480-520 ℃, and the discharge port temperature is 530-550 ℃; forming a completely supersaturated solid solution in the metallographic structure of the alloy by a solid solution process; the electrochemical properties such as the electrical conductivity and the like of the alloy are improved through an aging process. The invention can realize the mechanical properties of RM more than or equal to 350MPa, Rp0.2 more than or equal to 320MPa and the conductivity IACS more than or equal to 46. The mechanical property is improved by more than 12 percent, and the conductivity is also improved by 10 percent. Multiple batch supplies are now being realized.
Description
Technical Field
The invention relates to a production process method of a section bar for high-conductivity and high-strength aluminum alloy electrical equipment, belonging to the technical field of aluminum extrusion processing.
Background
The chemical composition range of 6082 aluminum alloy given by the national standard GB/T3190 is wide. And the mechanical properties of 6082-T6 in the national standard GB/T6892 are only Rm more than or equal to 310MPa and Rp0.2 more than or equal to 260 MPa. The conductivity IACS is more than or equal to 40. The mechanical property and the electrochemical property can not meet the market demand.
At present, the chemical components and the metallographic structure of the alloy are direct factors influencing the mechanical property and the electrochemical property of the alloy. The higher the alloying degree of the aluminum alloy under the same condition, the higher the mechanical property of the aluminum alloy, and the poorer the electrical conductivity of the aluminum alloy. The more strengthening phases in the same aluminum alloy metallographic structure, the more crystal boundaries in the structure, the higher the mechanical property, and the lower the conductivity, and the mechanical property and the conductivity are one spear.
Mg and Si are 6082 main strengthening alloys, and the produced Mg2Si alloy phase is a main strengthening phase. The chemical composition of the material is controlled, so that the alloy proportion of the Mg2Si strengthening phase is sufficient, the content of Si element is excessive, and the wear resistance of the alloy and the surface quality of the extruded section are improved. The content of Mn element is controlled to be lower limit, and a certain amount of Mn element can increase the recrystallization temperature and obviously refine recrystallized grains. Mainly forms MnAl6 compound dispersoid points which have the function of inhibiting the growth of recrystallized grains. MnAl6 also dissolves iron as an impurity to form (Fe. Mn) Al6, reducing the deleterious effects of iron. When MnAl6 dispersed particles act on an aluminum alloy matrix, the conductivity of the profile is seriously influenced. Therefore, a production process method of a section bar for high-conductivity and high-strength aluminum alloy electrical equipment is urgently needed to solve the problem in the prior art.
In order to solve the technical problems, a new technical scheme is especially provided.
Disclosure of Invention
The invention aims to provide a production process method of a section bar for high-conductivity and high-strength aluminum alloy electrical equipment, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a production process method of a section bar for high-conductivity and high-strength aluminum alloy electrical equipment comprises the following steps:
step one, controlling the smelting temperature at 710-;
step two, casting technology, namely adopting an equal-level hot top semi-continuous casting, standing the melt after 20-30min, uniformly adding an AlTiB refiner, filtering the melt by a 30-60-mesh ceramic filter plate, and controlling the casting temperature of 680-730 ℃ and the casting speed to ensure that the surface quality and the metallographic structure of the cast rod meet the requirements of above grade II of YS/T67;
thirdly, eliminating the segregation of the components of the cast bar structure through a homogenization process, and stabilizing the metallographic structure of the cast bar;
step four, forming by an extrusion process, wherein the rod temperature in the extrusion process is 510-;
step five, forming a completely supersaturated solid solution for the alloy metallographic structure by a solid solution process, wherein the temperature of a discharge port of the solid solution process is strictly controlled at 530 ℃ and 550 ℃, and an online water penetration quenching solid solution process is adopted, and the cooling speed is more than or equal to 150 ℃/S;
and sixthly, improving the electrochemical properties such as the conductivity of the alloy through an aging process, wherein the aging process comprises two times of aging, the temperature of the first time of aging is 170 +/-5 ℃, the temperature is kept for 10-11 hours, the aging process is low-temperature long-time aging, the strengthening phase in the supersaturated solid solution can be fully precipitated, the temperature of the second time of aging is 200 +/-5 ℃, and the temperature is kept for 3-4 hours.
Preferably, the number of refining is 3, each for 20 minutes. The amount of the refiner is 1-2Kg/T
Preferably, the controlled casting speed is 140mm/min and 120-50-180mm/min, wherein the casting speed is phi 170-100-.
Compared with the prior art, the invention has the beneficial effects that: the process method can realize that the mechanical property is RM more than or equal to 350MPa, Rp0.2 more than or equal to 320MPa and the electrical conductivity IACS more than or equal to 46 by optimizing the alloy components, strictly controlling the homogenizing process, the extruding process, the solid solution process and the aging process. The mechanical property is improved by more than 12 percent, and the conductivity is also improved by 10 percent. Multiple batch supplies are now being realized.
Drawings
FIG. 1 is a schematic diagram of the optimized components of the invention.
FIG. 2 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached drawings of the specification, the invention provides a technical scheme that: a production process method of a section bar for high-conductivity and high-strength aluminum alloy electrical equipment comprises the following steps:
step one, controlling the smelting temperature at 710-;
step two, casting technology, namely adopting an equal-level hot top semi-continuous casting, standing the melt after 20-30min, uniformly adding an AlTiB refiner, filtering the melt by a 30-60-mesh ceramic filter plate, and controlling the casting temperature of 680-730 ℃ and the casting speed to ensure that the surface quality and the metallographic structure of the cast rod meet the requirements of above grade II of YS/T67;
thirdly, eliminating the segregation of the components of the cast bar structure through a homogenization process, and stabilizing the metallographic structure of the cast bar;
step four, forming by an extrusion process, wherein the rod temperature in the extrusion process is 510-;
step five, forming a completely supersaturated solid solution for the alloy metallographic structure by a solid solution process, wherein the temperature of a discharge port of the solid solution process is strictly controlled at 530 ℃ and 550 ℃, and an online water penetration quenching solid solution process is adopted, and the cooling speed is more than or equal to 150 ℃/S;
and sixthly, improving the electrochemical properties such as the conductivity of the alloy through an aging process, wherein the aging process comprises two times of aging, the temperature of the first time of aging is 170 +/-5 ℃, the temperature is kept for 10-11 hours, the aging process is low-temperature long-time aging, the strengthening phase in the supersaturated solid solution can be fully precipitated, the temperature of the second time of aging is 200 +/-5 ℃, and the temperature is kept for 3-4 hours.
Preferably, the number of refining is 3, each for 20 minutes. The amount of the refiner is 1-2Kg/T
Preferably, the controlled casting speed is 140mm/min and 120-50-180mm/min, wherein the casting speed is phi 170-100-.
The technical method aims to provide a technical method to meet the requirements of high mechanical property and high conductivity of 6082 aluminum alloy. The purpose of the electrical equipment is met, and the requirements of customers are met.
Referring to FIG. 1, the optimized composition table controls the smelting temperature to be 710-760 ℃ and the refining temperature to be 740-760 ℃. The melt was refined using argon. Refining was carried out 3 times for 20 minutes each time. Can make the melt completely alloyed and avoid the composition segregation. But also can lead the slag in the melt to gather and float up, is convenient for slag skimming and leads the melt to be purer. And the melt cannot be over-burnt, so that the alloy is excessively burnt.
2. And (3) casting process: adopting an equal level hot top semi-continuous casting, standing the melt for 20-30min, uniformly adding 1-2Kg/T of AlTiB refiner, filtering the melt by a ceramic filter plate with 30-60 meshes, and controlling the casting temperature of 680-730 ℃ and the casting speed (phi 170-100-140mm/min and phi 120-50-180 mm/min). The surface quality and the metallographic structure of the cast rod can meet the requirement of more than II grade of YS/T67.
3. And (3) homogenizing: 6-8H strong wind at 565 +/-5 ℃ and water mist cooling. Can effectively eliminate the segregation of the structure components of the cast rod. The metallographic structure of the cast rod is stabilized, and the extrusion performance of the cast rod is improved.
4. An extrusion process: the rod temperature is 510 ℃ and 530 ℃, and the cylinder temperature is 380 ℃ and 420 ℃. The mold 480-. The outlet temperature 530 ℃ and 550 ℃. The size and the surface quality of the product can meet the technical requirements of the product.
5. Solid solution process: the temperature of the discharge port is strictly controlled at 530 ℃ and 550 ℃, and an on-line water penetration quenching solid solution process is adopted. Cooling rate: not less than 150 ℃/S. Continuously cooling to room temperature without temperature return phenomenon. Compared with the mode of off-line solid solution treatment, the mode saves energy and can improve the production efficiency. And can make the alloy metallographic structure form a completely supersaturated solid solution.
6. The aging process comprises the following steps: the aging is carried out for two times, the temperature of the primary aging is 170 +/-5 ℃, the heat preservation is carried out for 10-11 hours, the low-temperature long-time aging is carried out, and the strengthening phase (Mg2Si) in the supersaturated solid solution can be fully precipitated. The mechanical property of the alloy reaches the peak value. However, the conductivity at this time is not satisfactory. And then carrying out secondary aging at the temperature of 200 +/-5 ℃ for 3-4 h. The internal structure stress of the alloy and the dislocation in the metallographic structure can be further eliminated, and the metallographic structure in the alloy is more uniform, smooth and stable. Improve the electrochemical properties of the alloy such as conductivity and the like. And the mechanical property is not reduced much or is not changed basically.
The electrical conductivity and mechanical property of the 6082-T6 alloy for the electrical equipment can reach RM being more than or equal to 350MPa, Rp0.2 being more than or equal to 320MPa and the electrical conductivity IACS being more than or equal to 46 by the process method.
Examples
The parallel groove clamp product for electrical equipment has the material state requirement of 6082-T6, mechanical performance of RM not less than 350MPa, Rp0.2 not less than 320MPa and conductivity IACS not less than 46. The production of the product comprises the following steps:
1. smelting: the smelting temperature is 750 ℃ at the temperature of minus 20T of a rectangular regenerative dome radiant furnace, the refining temperature is 735 ℃, and argon and an environment-friendly sodium-free refining agent are adopted for refining. Refining for 3 times, and removing waste residue after 20Min refining is completed each time. The chemical components are as follows: si 1.05Mg 0.77Fe 0.18Cu 0.01Mn 0.51Cr 0.07
2. Casting: the melt temperature is 750 ℃, casting is carried out after standing for 30Min, and 1.2kg/T of refiner ALTIB wire is added. And filtered through a 40 mesh ceramic filter plate. The melt temperature on the casting pan was 710 ℃. The casting bar diameter was 170mm, the speed was 130mm/Miin, and the casting length was 9 m.
3. Homogenizing: the heating is carried out by adopting a trolley type natural gas heat circulation furnace, the heating temperature is 565 ℃, and the heat preservation is carried out for 7 hours. And after the furnace is discharged, a cooling mode of strong wind and water mist is adopted. And cooling to room temperature.
4. Extruding: A2000T horizontal forward extruder is provided with an online water cooling system. Heating rod temperature 510 ℃, mold temperature: 500 ℃ and the temperature of the extrusion cylinder is 390 ℃. The extrusion speed was controlled and the discharge port temperature was 550 ℃. The size and the surface quality of the section meet the requirements of technical drawings.
5. Solid solution: and an online water cooling mode is adopted. The outlet temperature was 550 ℃. After leaving the water cooling device, the temperature of the profile was 28 ℃.
And (5) straightening the subsequent section, sawing the section into a standard 6m fixed length, and framing the section. And (5) preparing for aging.
6. Aging: a trolley type natural gas thermal cycle aging furnace is adopted, the primary aging heating temperature is 170 ℃, and the heat preservation is carried out for 11 hours. Taking out of the furnace, air cooling to room temperature, performing secondary aging, heating to 200 ℃, and preserving heat for 4 hours. Discharging and air cooling.
And randomly sampling to detect the mechanical property and the conductivity. Mechanical properties: r Rm: 392.2 MPa. Rp0.2376.4Mpa A% 15.5. Conductivity IACS% 46.5 Rm: 388.8 MPa. Rp0.2373.1Mpa A% 16. Conductivity IACS% 46.8.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A production process method of a section bar for high-conductivity and high-strength aluminum alloy electrical equipment is characterized by comprising the following steps:
step one, controlling the smelting temperature at 710-;
step two, casting technology, namely adopting an equal-level hot top semi-continuous casting, standing the melt after 20-30min, uniformly adding an AlTiB refiner, filtering the melt by a 30-60-mesh ceramic filter plate, and controlling the casting temperature of 680-730 ℃ and the casting speed to ensure that the surface quality and the metallographic structure of the cast rod meet the requirements of above grade II of YS/T67;
thirdly, eliminating the segregation of the components of the cast bar structure through a homogenization process, and stabilizing the metallographic structure of the cast bar;
step four, forming by an extrusion process, wherein the rod temperature in the extrusion process is 510-;
step five, forming a completely supersaturated solid solution for the alloy metallographic structure by a solid solution process, wherein the temperature of a discharge port of the solid solution process is strictly controlled at 530 ℃ and 550 ℃, and an online water penetration quenching solid solution process is adopted, and the cooling speed is more than or equal to 150 ℃/S;
and sixthly, improving the electrochemical properties such as the conductivity of the alloy through an aging process, wherein the aging process comprises two times of aging, the temperature of the first time of aging is 170 +/-5 ℃, the temperature is kept for 10-11 hours, the aging process is low-temperature long-time aging, the strengthening phase in the supersaturated solid solution can be fully precipitated, the temperature of the second time of aging is 200 +/-5 ℃, and the temperature is kept for 3-4 hours.
2. The production process method of the section bar for the high-conductivity high-strength aluminum alloy electrical equipment, according to claim 1, is characterized in that: the number of refining was 3 times, each for 20 minutes. The amount of the refiner is 1-2 Kg/T.
3. The production process method of the section bar for the high-conductivity high-strength aluminum alloy electrical equipment, according to claim 1, is characterized in that: the casting speed is controlled to be phi 170-100-140mm/min and phi 120-50-180 mm/min.
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Application publication date: 20201120 |