Aluminum skived-tooth radiator profile, extrusion production method and application thereof

Abstract

The present invention provides an aluminum skived-tooth radiator profile, an extrusion production method and its application, and relates to the field of aluminum skived-tooth radiator profiles. The extrusion production method of the aluminum skived-tooth radiator profile consists of the following steps: smelting, casting, and extrusion. The aluminum skived-tooth radiator profile, the extrusion production method and its application of the present invention are aimed at the problems of poor production stability in the extrusion production process of high-magnification aluminum skived-tooth radiator profiles, serious coarse crystal problems in the extruded aluminum plate profiles obtained by extrusion and air cooling, uneven grain size, and undesirable low-magnification structure. It can avoid the problems of bent teeth or slightly bent teeth, broken teeth, uneven tooth surface, burrs on tooth plates, uneven hardness, etc. in the extruded profiles, improve the qualified rate of finished products, and reduce raw material loss; at the same time, further improve the production efficiency of the extrusion production of aluminum skived-tooth radiator profiles.

Description

Technical Field

[0001] The invention relates to the field of aluminum skived-tooth radiator profiles, and in particular to an aluminum skived-tooth radiator profile, an extrusion production method and applications thereof. Background Art

[0002] As a device for conducting and dissipating heat, radiators are widely used in new energy vehicles, photovoltaic energy storage inverters, wind power generation, electronic communications, 5G base stations, charging piles, smart devices, etc. Radiators are roughly divided into copper, cast iron, steel and aluminum alloy according to their materials. Among them, aluminum alloy radiators have the advantages of light weight, corrosion resistance, beautiful appearance, high cost performance and diversified shapes, and have been increasingly favored in recent years. Existing aluminum alloy radiators can be divided into extruded radiators, skived radiators, slotted radiators and other types according to different processing methods. Among them, skived radiators are known for their high thermal efficiency, light weight and small size. In recent years, the heat dissipation efficiency of skived radiators has been continuously improved, and they are widely used in many fields such as construction, automobiles, industry, aerospace, photovoltaic new energy, etc.

[0003] The existing skived-tooth radiator production process usually involves using a skived-tooth machine to machine the heat dissipation fins on extruded aluminum sheets or hot-rolled aluminum sheets, and then sawing them to obtain extruded aluminum sheet skived-tooth radiators and hot-rolled aluminum sheet skived-tooth radiators, respectively. Among them, hot-rolled aluminum sheet skived-tooth radiators have problems such as large aluminum material loss and high production costs, and are currently being replaced by extruded aluminum sheet skived-tooth radiators. At the same time, extruded aluminum sheet skived-tooth radiators can also solve the shortcomings of the traditional one-time extrusion molding process, such as the difficulty of extrusion discharge and the inability to achieve ultra-high-tooth extrusion. They can produce ultra-wide radiators with high density, large tooth height, and a high number of teeth, thereby obtaining better heat dissipation efficiency and air ducts, which are about 30% more efficient than traditional aluminum alloy extruded radiators. In addition, due to the relatively simple cross-section of the extruded profile, the requirements for the extrusion die during the production process can be significantly reduced, which can further improve product production efficiency. As a result, the research and development and application of high-tooth extruded aluminum sheet skived-tooth radiators have increased in recent years.

[0004] While extruded aluminum skived-tooth radiators offer all of the aforementioned advantages, they place extremely high demands on the material and production process. During the production process, the extruded aluminum profiles are prone to problems such as bent teeth, broken teeth, uneven tooth surfaces, and burrs on the teeth. This results in a low yield rate and high raw material loss. For example, skived-tooth radiator profiles extruded from national standard aluminum rods exhibit noticeable coarse grains on the surface and numerous pinhole defects in the cross-section. Furthermore, after skiving, the profiles exhibit defects such as bent teeth, broken teeth, uneven tooth surfaces, and burrs on the teeth, which cannot be effectively overcome. Furthermore, the production efficiency of the extrusion production of aluminum skived-tooth radiator profiles still needs to be further improved.

[0005] Furthermore, the inventors discovered through research that the existing high-tooth (tooth height to tooth spacing ratio is greater than 40) aluminum skived-tooth radiator profiles have poor production stability during the extrusion production process, and the extruded aluminum plate profiles obtained by extrusion and air cooling have serious coarse grain problems, uneven grain size, and unsatisfactory low-magnification structure; and the skived teeth of the high-tooth aluminum skived-tooth radiator produced are often slightly bent, and the qualified rate of finished products is low. Summary of the Invention

[0006] In order to solve the technical problems existing in the prior art, the present invention provides an aluminum skived-tooth radiator profile, an extrusion production method and its application. In view of the poor production stability during the extrusion production of aluminum skived-tooth radiator profiles with high teeth (the ratio of tooth height to tooth spacing is greater than 40), the extruded aluminum plate profiles obtained by extrusion and air cooling have serious coarse grain problems, uneven grain size, and unsatisfactory low-magnification structure. The present invention can avoid the problems of bent teeth or slightly bent teeth, broken teeth, uneven tooth surface, burrs on tooth plates, uneven hardness and other undesirable problems in the extruded profiles, improve the qualified rate of finished products, and reduce raw material loss; at the same time, further improve the production efficiency of the extrusion production of aluminum skived-tooth radiator profiles.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0008] An extrusion production method for an aluminum skived-tooth radiator profile comprises the following steps: melting, casting, and extrusion;

[0009] The smelting and casting method comprises: melting and casting an ingot to obtain a cast rod having an average grain size of 135-137 μm;

[0010] The ingot contains the following components in percentage: Si 0.1-0.13wt%, Mg≤0.03wt%, Fe≤0.15wt%, Cu≤0.03wt%, Mn≤0.03wt%, Cr≤0.03wt%, Zn≤0.03wt%, Ti≤0.03wt%, V≤0.03wt%, Al≥99.6wt%, and unavoidable impurities;

[0011] The extrusion method comprises controlling the extrusion speed to be 3-6 mm / s, extruding the cast rod, quenching the rod after extrusion, controlling the temperature of the profile entering the quenching zone to be 380-390° C., and the temperature of the profile exiting the quenching zone to be no greater than 40° C.; then controlling the stretching rate to be 1-2%, straightening the profile, and sawing the profile to obtain the aluminum skived-tooth radiator profile;

[0012] The quenching cooling method is water spray cooling.

[0013] Preferably, during the extrusion, the extrusion die temperature is controlled to be 390-410° C., the extrusion barrel temperature is controlled to be 370-390° C., the cast rod temperature is controlled to be 350-370° C.; and the extrusion pulling speed is controlled to be 2.6-3 m / min.

[0014] Preferably, during the extrusion, the water flow rate of the water spray cooling is 0.65-0.75m 3 / h.

[0015] Furthermore, the smelting and casting is as follows: the ingot is put into a melting and casting furnace, the melting and casting temperature is controlled to be 750-760°C, and the ingot is stirred and melted to obtain a melt; argon is introduced for the first refining and online degassing and slag removal; then a second refining and online degassing and slag removal are carried out, and after standing, a casting modifier is added at a temperature of 700-750°C, filtered, and cast to obtain a cast rod.

[0016] Preferably, in the smelting and casting, the first refining temperature is 750-760° C., and the first refining time is 20-30 min;

[0017] The second refining temperature is 740-750℃ and the second refining time is 15-20min;

[0018] The casting speed is 115-130 mm / min.

[0019] Preferably, in the smelting and casting, the casting modifier is aluminum titanium boron wire, and the amount of the casting modifier added to each ton of melt is 0.04-0.05wt%.

[0020] Preferably, in the smelting and casting, the ingot contains the following components in percentage: Si 0.12-0.13wt%, Mg 0.015-0.03wt%, Fe 0.1-0.15 wt%, Cu 0.015-0.03wt%, Mn 0.015-0.03wt%, Cr 0.015-0.03wt%, Zn 0.015-0.03wt%, Ti 0.015-0.03wt%, V 0.015-0.03wt%, Al≥99.6wt%, and inevitable impurities.

[0021] An aluminum skived-tooth radiator profile is produced by the production method described in claim 1; the aluminum skived-tooth radiator profile has an average grain size of 66-90 μm, a Barcol hardness of 38-40 HBA, and a macrostructure coarse grain layer depth of ≤1 mm.

[0022] An application of the aforementioned aluminum skived-tooth radiator profile, the application of the aluminum skived-tooth radiator profile in the preparation of a high-multiple aluminum skived-tooth radiator; the high-multiple tooth ratio is not less than 43 times.

[0023] Furthermore, the skiving angle is controlled to be 11.7°, and the aluminum skived radiator profile is skived. The skiving tooth spacing is controlled to be 1.5-1.6mm, the tooth thickness is 1.0-1.1mm, and the high-multiple tooth multiple is not less than 43 times. After the skiving process is completed, the milling surface is processed to obtain a high-multiple aluminum skived radiator.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The extrusion production method of the aluminum skived-tooth radiator profile of the present invention adopts an improved composition ingot in the melting and casting process, controls the Cu content to 0.03wt% or less, reduces the Si and Fe contents, and controls the Fe content to be slightly greater than the Si content, and appropriately controls the Cr, Ti, and V contents. At the same time, primary and secondary distillation are set in the melting and casting process, and the hydrogen content of the melt is controlled to ≤0.15mL / 100g to control the grain size of the profile. In the extrusion process, the specific extrusion speed, quenching cooling method, and straightening elongation are controlled to further control the The grain size, hardness and coarse grain layer depth of the profile are controlled, which effectively overcomes the problems of serious coarse grain defects, many pinhole defects, uneven grain size, uneven hardness, and unsatisfactory low-magnification structure of the aluminum skived-tooth radiator profile, and effectively adjusts the hardness and plasticity of the profile, avoiding defects such as bent teeth, broken teeth, uneven tooth surface, and burrs on the tooth pieces during the subsequent extrusion process of the profile, reducing the bending rate of the skived teeth to 0%, effectively improving the qualified rate of finished products, reducing raw material loss, and reducing production costs; at the same time, further improving the production efficiency of the extrusion production of aluminum skived-tooth radiator profiles.

[0026] 2. The extrusion production method of aluminum skived-tooth radiator profiles disclosed herein effectively overcomes the problems of noticeable coarse grains on the profile surface and numerous pinhole defects in the profile cross-section that often occur when using national standard aluminum rod raw materials. The extruded aluminum skived-tooth radiator profiles have an average grain size of 66-90 μm, a Bacol hardness of 38-40 HBA, no pinhole defects in the macrostructure, a coarse-grain layer depth of less than 1 mm, and fine and uniform grains in the macrostructure.

[0027] 3. The extrusion production method of the aluminum skived-tooth radiator profile of the present invention can efficiently extrude, quench and cool, and straighten the cast rod profile obtained by smelting and casting. There is no platform traffic jam during the processing, which effectively realizes the continuous production of the aluminum skived-tooth radiator profile, further improves production efficiency, reduces production costs, and is suitable for large-scale industrial production.

[0028] 4. The aluminum skived-tooth radiator profile of the present invention is used in the preparation of high-tooth aluminum skived-tooth radiators. After skiving, the high-tooth aluminum skived-tooth radiator has a high-tooth ratio of 43-50, a skived-tooth pitch of 1.5-1.6 mm, a tooth thickness of 1.0-1.1 mm, a Bacol hardness of 38-40 HBA, and a skived-tooth curvature of 0%. It can be effectively applied to working scenarios such as high-power inverters in photovoltaic energy storage stations that require the use of high-tooth aluminum skived-tooth radiators. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a 200x microstructure image of the aluminum skived-tooth radiator profile of Example 1;

[0030] Figure 2 This is a 500x microstructure image of the aluminum skived-tooth radiator profile of Example 1;

[0031] Figure 3 This is a pinhole defect image of the aluminum profile cross section of Comparative Example 1;

[0032] Figure 4 This is the "orange peel" defect image on the surface of the aluminum profile of Comparative Example 1;

[0033] Figure 5 This is a diagram showing the tooth bending of the skived-tooth radiator after skived-tooth processing using the aluminum profile of Comparative Example 1;

[0034] Figure 6 This is a picture of the unqualified finished product after the aluminum profile of comparative example 1 was processed with tooth skiving. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described.

[0036] Example 1

[0037] This embodiment provides an extrusion production method for an aluminum skived-tooth radiator profile, and the specific steps are as follows:

[0038] 1) Melting and casting

[0039] The ingot includes the following components, in percentage by mass: Si 0.12wt%, Mg 0.015wt%, Fe 0.1wt%, Cu 0.015wt%, Mn 0.015wt%, Cr 0.015wt%, Zn 0.015wt%, Ti 0.015wt%, V 0.015wt%, and the balance is Al (Al>99.6wt%), and inevitable impurities.

[0040] The ingot was melted and cast to obtain a cast rod with an average grain size of 135 μm.

[0041] Specifically, the ingot is put into a melting furnace, the melting temperature is controlled at 755°C, the ingot is stirred and melted to obtain a melt; argon is introduced for the first refining and online degassing, the hydrogen content in the melt is controlled to be ≤0.15mL / 100g, the first refining temperature is 755°C, and after the first refining for 25 minutes, the slag is removed; then the second refining is carried out and online degassing is carried out, the second refining temperature is controlled at 745°C, and after the second refining for 17 minutes, the slag is removed; then it is allowed to stand for 20 minutes, and at a temperature of 720°C, a casting modifier is added, and after online double-stage filtration using 40-mesh and 60-mesh foam ceramic filter plates, casting is carried out, and the casting speed is controlled at 120mm / min to obtain a cast rod with an average grain size of 135μm.

[0042] Among them, the casting modifier is aluminum titanium boron wire, and the amount of casting modifier added to each ton of melt is 0.045wt%, that is, 0.45kg of aluminum titanium boron wire is added to each ton of melt.

[0043] 2) Squeeze

[0044] The extrusion die temperature is controlled at 395°C, the extrusion barrel temperature is 380°C, the casting rod temperature is 360°C, the casting rod is extruded, the extrusion traction speed is controlled at 2.7m / min, and the extrusion speed is 3mm / s; after the extrusion is completed, quenching is performed, and the temperature of the profile entering the quenching zone is controlled to be 385°C, and the temperature of the profile exiting the quenching zone is not greater than 40°C; then the stretching rate is controlled to be 1%, and the profile is straightened and sawed to obtain an extruded aluminum plate profile (i.e., an aluminum skived tooth radiator profile); the average grain size of the aluminum skived tooth radiator profile is 66μm, the Babcock hardness is 39HBA, the depth of the macrostructure coarse grain layer is 0.8mm, and the macrostructure has no pinhole defects. As shown in the attached manual Figure 1-2 As shown in the 200x microstructure diagram and 500x microstructure diagram of the aluminum skived-tooth radiator profile obtained in this embodiment, it can be seen that the high-magnification microstructure grain size of the obtained aluminum skived-tooth radiator profile is uniform.

[0045] The quenching cooling method in the quenching zone is water spray cooling, and the water spray flow rate is 0.7m 3 / h.

[0046] This embodiment also provides an aluminum skived-tooth radiator profile produced by the extrusion production method of the aforementioned aluminum skived-tooth radiator profile.

[0047] This embodiment also provides an application of the aluminum skived-tooth radiator profile in a high-multiple-tooth aluminum skived-tooth radiator. Specifically, the skiving angle is controlled to be 11.7°, and the aluminum skived-tooth radiator profile is skived. The skived tooth spacing is controlled to be 1.5mm, the tooth thickness is 1.0mm, and the high-multiple-tooth multiple is 50 times. After the skiving is completed, the high-multiple-tooth aluminum skived-tooth radiator is obtained by milling.

[0048] The high-tooth aluminum skived-tooth radiator has a Bacol hardness of 38HBA and a tooth curvature of 0%.

[0049] Example 2

[0050] This embodiment provides an extrusion production method for an aluminum skived-tooth radiator profile, and the specific steps are as follows:

[0051] 1) Melting and casting

[0052] The ingot includes the following components, in percentage by mass: Si 0.12wt%, Mg 0.015wt%, Fe 0.1wt%, Cu 0.015wt%, Mn 0.015wt%, Cr 0.015wt%, Zn 0.015wt%, Ti 0.015wt%, V 0.015wt%, and the balance is Al (Al>99.6wt%), and inevitable impurities.

[0053] The above ingot was melted and cast to obtain a cast rod with an average grain size of 136 μm.

[0054] Specifically, the ingot is put into a melting furnace, the melting temperature is controlled to 750°C, the ingot is stirred and melted to obtain a melt; argon is introduced for the first refining and online degassing, the hydrogen content in the melt is controlled to be ≤0.15mL / 100g, the first refining temperature is 750°C, and after the first refining for 20 minutes, the slag is removed; then the second refining is carried out and online degassing is carried out, the second refining temperature is controlled to 740°C, and after the second refining for 15 minutes, the slag is removed; then it is allowed to stand for 15 minutes, and at a temperature of 700°C, a casting modifier is added, and after online double-stage filtration using 40-mesh and 60-mesh foam ceramic filter plates, casting is carried out, the casting speed is controlled to 115mm / min, and a cast rod with an average grain size of 136μm is obtained.

[0055] Among them, the casting modifier is aluminum titanium boron wire, and the amount of casting modifier added to each ton of melt is 0.04wt%, that is, 0.4kg of aluminum titanium boron wire is added to each ton of melt.

[0056] 2) Squeeze

[0057] The extrusion die temperature, the extrusion barrel temperature, and the cast rod temperature are controlled at 390°C, 370°C, and 350°C, and the cast rod is extruded. The extrusion pulling speed and the extrusion speed are controlled at 2.6 m / min and 4 mm / s. After extrusion, the extrusion rod is quenched, and the temperature of the profile entering the quenching zone is controlled at 380°C and the temperature of the profile exiting the quenching zone is controlled to be no greater than 40°C. The elongation is then controlled at 1.2%, and the profile is straightened and sawed to obtain an extruded aluminum plate profile (i.e., an aluminum skived-tooth radiator profile). The aluminum skived-tooth radiator profile has an average grain size of 72 μm, a Babcock hardness of 38 HBA, a macrostructure coarse-grained layer depth of 0.8 mm, and no pinhole defects in the macrostructure.

[0058] The quenching cooling method in the quenching zone is water spray cooling, and the water spray flow rate is 0.65m 3 / h.

[0059] This embodiment also provides an aluminum skived-tooth radiator profile produced by the extrusion production method of the aforementioned aluminum skived-tooth radiator profile.

[0060] This embodiment also provides an application of the aluminum skived-tooth radiator profile in a high-multiple-tooth aluminum skived-tooth radiator. Specifically, the skiving angle is controlled to be 11.7°, and the aluminum skived-tooth radiator profile is skived. The skived tooth spacing is controlled to be 1.55mm, the tooth thickness is 1.05mm, and the high-multiple-tooth multiple is 45 times. After the skiving process is completed, the high-multiple-tooth aluminum skived-tooth radiator is obtained by milling the surface.

[0061] The high-tooth aluminum skived-tooth radiator has a Bacol hardness of 38HBA and a tooth curvature of 0%.

[0062] Example 3

[0063] This embodiment provides an extrusion production method for an aluminum skived-tooth radiator profile, and the specific steps are as follows:

[0064] 1) Melting and casting

[0065] The ingot includes the following components, in percentage by mass: Si 0.12wt%, Mg 0.015wt%, Fe 0.1wt%, Cu 0.015wt%, Mn 0.015wt%, Cr 0.015wt%, Zn 0.015wt%, Ti 0.015wt%, V 0.015wt%, and the balance is Al (Al>99.6wt%), and inevitable impurities.

[0066] The ingot was melted and cast to obtain a cast rod with an average grain size of 137 μm.

[0067] Specifically, the ingot is put into a melting furnace, the melting temperature is controlled to 760°C, the ingot is stirred and melted to obtain a melt; argon is introduced for the first refining and online degassing, the hydrogen content in the melt is controlled to be ≤0.15mL / 100g, the first refining temperature is 760°C, and after the first refining for 30 minutes, the slag is removed; then the second refining is carried out and online degassing is carried out, the second refining temperature is controlled to 750°C, and after the second refining for 20 minutes, the slag is removed; then it is allowed to stand for 25 minutes, and at a temperature of 750°C, a casting modifier is added, and after online double-stage filtration using 40-mesh and 60-mesh foam ceramic filter plates, casting is carried out, the casting speed is controlled to 130mm / min, and a cast rod with an average grain size of 137μm is obtained.

[0068] Among them, the casting modifier is aluminum titanium boron wire, and the amount of casting modifier added to each ton of melt is 0.05wt%, that is, 0.5kg of aluminum titanium boron wire is added to each ton of melt.

[0069] 2) Squeeze

[0070] The extrusion die temperature, the extrusion barrel temperature, and the cast rod temperature are controlled at 410°C, 390°C, and 370°C, and the cast rod is extruded. The extrusion pulling speed and the extrusion speed are controlled at 2.8 m / min and 6 mm / s. After extrusion, the extrusion rod is quenched, and the temperature of the profile entering the quenching zone is controlled at 390°C and the temperature of the profile exiting the quenching zone is controlled to be no greater than 40°C. The elongation rate is then controlled at 2%, and the profile is straightened and sawed to obtain an extruded aluminum plate profile (i.e., an aluminum skived-tooth radiator profile). The aluminum skived-tooth radiator profile has an average grain size of 90 μm, a Babcock hardness of 40 HBA, a macrostructure coarse-grained layer depth of 0.9 mm, and no pinhole defects in the macrostructure.

[0071] The quenching cooling method in the quenching zone is water spray cooling, and the water spray flow rate is 0.75m 3 / h.

[0072] The present invention also provides an aluminum skived-tooth radiator profile produced by the extrusion production method of the above-mentioned aluminum skived-tooth radiator profile.

[0073] The present invention also provides an application of the aluminum skived-tooth radiator profile in a high-multiple-tooth aluminum skived-tooth radiator. Specifically, the skived-tooth angle is controlled to be 11.7°, and the aluminum skived-tooth radiator profile is subjected to skived-tooth processing. The skived-tooth tooth spacing is controlled to be 1.6 mm, the tooth thickness is 1.1 mm, and the high-multiple-tooth multiple is 43 times. After the skived-tooth processing is completed, the high-multiple-tooth aluminum skived-tooth radiator is obtained by milling the surface.

[0074] The high-tooth aluminum skived-tooth radiator has a Barcol hardness of 40HBA and a tooth curvature of 0%.

[0075] Example 4

[0076] This embodiment provides an extrusion production method for an aluminum skived-tooth radiator profile, and the specific steps are as follows:

[0077] 1) Melting and casting

[0078] The ingot includes the following components, in percentage by mass: Si 0.12wt%, Mg 0.015wt%, Fe 0.1wt%, Cu 0.015wt%, Mn 0.015wt%, Cr 0.015wt%, Zn 0.015wt%, Ti 0.015wt%, V 0.015wt%, and the balance is Al (Al>99.6wt%), and inevitable impurities.

[0079] The ingot was melted and cast to obtain a cast rod with an average grain size of 125 μm.

[0080] Specifically, the ingot is put into a melting furnace, the melting temperature is controlled to 755°C, the ingot is stirred and melted to obtain a melt; argon is introduced for the first refining and online degassing, the hydrogen content in the melt is controlled to be ≤0.15mL / 100g, the first refining temperature is 755°C, and after the first refining for 25 minutes, the slag is removed; then the second refining is carried out and online degassing is carried out, the second refining temperature is controlled to 745°C, and after the second refining for 17 minutes, the slag is removed; then it is allowed to stand for 20 minutes, and at a temperature of 720°C, a casting modifier is added, and after online double-stage filtration using 40-mesh and 60-mesh foam ceramic filter plates, casting is carried out, the casting speed is controlled to 120mm / min, and a cast rod with an average grain size of 125μm is obtained.

[0081] Among them, the amount of casting modifier added to each ton of melt is 0.05wt%, that is, 0.5kg of casting modifier is added to each ton of melt.

[0082] The casting modifier is a mixture of aluminum titanium boron wire and a modification aid, and the weight ratio of the aluminum titanium boron wire to the modification aid is 4:1.

[0083] The deterioration aid is prepared by the following method:

[0084] The ammonium bifluoride solution, the mixed rare earth solution and the hexadecyltrimethylammonium bromide are uniformly mixed, the temperature is increased to 65°C at a heating rate of 0.5°C / min, and the mixture is stirred at 150 rpm for 220 hours. The mixture is then transferred into a high-pressure reactor, the high-pressure reactor is sealed, the temperature is controlled to be increased to 120°C, the temperature is kept for 36 hours, and the mixture is naturally cooled to room temperature. After the solid is separated, the solid is washed with deionized water to neutrality, and then dried at 90°C to constant weight in a vacuum environment of 0.08 MPa to obtain nano-rare earth fluoride. The nano-rare earth fluoride and nano-titanium dioxide are uniformly mixed in a weight ratio of 1:5 to obtain a deterioration aid.

[0085] Wherein, the ammonium bifluoride solution is an ammonium bifluoride aqueous solution with a concentration of 20wt%.

[0086] The mixed rare earth solution is an aqueous solution containing lanthanum nitrate, praseodymium nitrate and yttrium nitrate; the concentration of lanthanum nitrate is 8wt%, the concentration of praseodymium nitrate is 4wt% and the concentration of yttrium nitrate is 2wt%.

[0087] The molar ratio of ammonium bifluoride, lanthanum nitrate, praseodymium nitrate, yttrium nitrate and hexadecyltrimethylammonium bromide is 10:0.8:0.4:0.2:1.

[0088] 2) Squeeze

[0089] The extrusion die temperature, the extrusion barrel temperature, and the cast rod temperature are controlled at 395°C, 380°C, and 360°C, and the cast rod is extruded. The extrusion pulling speed and the extrusion speed are controlled at 2.7m / min and 3mm / s, respectively. After extrusion, the extrusion rod is quenched, and the temperature of the profile entering the quenching zone is controlled at 385°C and the temperature of the profile exiting the quenching zone is controlled to be no greater than 40°C. The elongation rate is then controlled to 1%, and the profile is straightened and sawed to obtain an extruded aluminum plate profile (i.e., an aluminum skived-tooth radiator profile). The aluminum skived-tooth radiator profile has an average grain size of 61μm, a Babcock hardness of 40HBA, a macrostructure coarse-grained layer depth of 0.6mm, no pinhole defects in the macrostructure, and uniform grain size in the macrostructure.

[0090] The quenching cooling method in the quenching zone is water spray cooling, and the water spray flow rate is 0.7m 3 / h.

[0091] This embodiment also provides an aluminum skived-tooth radiator profile produced by the extrusion production method of the aforementioned aluminum skived-tooth radiator profile.

[0092] This embodiment also provides an application of the aluminum skived-tooth radiator profile in a high-multiple-tooth aluminum skived-tooth radiator. Specifically, the skiving angle is controlled to be 11.7°, and the aluminum skived-tooth radiator profile is skived. The skived tooth spacing is controlled to be 1.5mm, the tooth thickness is 1.0mm, and the high-multiple-tooth multiple is 55 times. After the skiving is completed, the high-multiple-tooth aluminum skived-tooth radiator is obtained by milling.

[0093] The high-tooth aluminum skived-tooth radiator has a Barcol hardness of 40HBA and a tooth curvature of 0%.

[0094] In this embodiment, an improved composition ingot is used in smelting and casting, the Cu content is controlled at 0.03wt% or less, the Si and Fe contents are reduced, and the Fe content is controlled to be slightly greater than the Si content, as well as appropriate Cr, Ti, and V. At the same time, in smelting and casting, primary distillation and secondary distillation are set, and the hydrogen content of the melt is controlled to be ≤0.15mL / 100g, thereby controlling the grain size of the profile. After refining, aluminum titanium boron wire and a modification agent containing nano-rare earth fluoride and nano-titanium dioxide are used as casting modifiers to further control the grain size of the profile, improve the stability of the profile in subsequent processing, and further improve the corrosion resistance of the profile, thereby obtaining a cast rod with an average grain size of 125μm. Then, a specific extrusion speed, quenching cooling method, and straightening elongation are controlled in extrusion. Further control the grain size, hardness and coarse grain layer depth of the profile, effectively overcome the problems of severe coarse grain defects, multiple pinhole defects, uneven grain size, uneven hardness, and unsatisfactory low-magnification structure of the aluminum skived-tooth radiator profile, and obtain an aluminum skived-tooth radiator profile with an average grain size of 61μm, a Bacol hardness of 40HBA, a low-magnification coarse grain layer depth of 0.6mm, no pinhole defects in the low-magnification structure, and uniform grain size in the high-magnification structure; thereby effectively avoiding defects such as bent teeth, broken teeth, uneven tooth surfaces, and burrs on the tooth pieces during the subsequent extrusion process of the profile. In the preparation of aluminum skived-tooth radiators with a high-magnification tooth ratio of 55 times using the profile, the skived tooth bending rate is maintained at 0%, which effectively improves the qualified rate of finished products, reduces raw material loss, and reduces production costs; at the same time, further improves the production efficiency of the extrusion production of aluminum skived-tooth radiator profiles.

[0095] Comparative Example 1

[0096] The technical solution of Example 1 is adopted, except that: 1) national standard 1060 aluminum rod is used for extrusion production, and the specific composition and percentage content of the aluminum rod are Si≤0.25wt%, Mg≤0.03wt%, Fe≤0.35 wt%, Cu≤0.05wt%, Mn≤0.03wt%, Zn≤0.05wt%, Ti≤0.03wt%, Al≥99.6wt%, and unavoidable impurities; 2) in the extrusion step, the extrusion speed is controlled to 6mm / s and the elongation is 2%; the cooling method is replaced by air cooling, and the air cooling air flow rate is 3m 3 / min.

[0097] The longest grain size of the profile obtained after extrusion treatment in Comparative Example 1 is 370μm, the Barcol hardness is 48HBA, the depth of the macrostructure coarse grain layer is 5mm, the macrostructure surface coarse grain is obvious, and there are a lot of pinhole defects on the cross section (see the attached manual). Figure 3 As shown in the figure), the profile surface has "orange peel" defects (as shown in the attached manual Figure 4 At the same time, in the subsequent tooth-removing process, the tooth curvature after tooth-removing exceeds 10% (as shown in the attached manual). Figure 5 As shown in the instruction manual), serious defects such as uneven tooth surface, broken teeth, and burrs on the teeth are likely to occur (see the attached Figure 6 As shown), the qualified rate of finished products is low.

[0098] Furthermore, the temperature of the profile after extrusion is 385°C, and it requires about 2 hours of air cooling time before subsequent straightening treatment can be carried out, which can easily lead to traffic congestion on the extrusion platform, inability to produce continuously, and low production efficiency.

[0099] Unless otherwise specified, all percentages used in the present invention are by mass.

[0100] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for producing an aluminum skived-tooth radiator profile by extrusion, characterized in that: It consists of the following steps: melting, casting and extrusion; The aluminum skived-tooth radiator profile is used to prepare a high-multiple aluminum skived-tooth radiator; the high-multiple tooth ratio is not less than 43 times; The smelting and casting method comprises the following steps: placing an ingot into a melting and casting furnace, controlling the melting and casting temperature to be 750-760° C., maintaining the temperature and stirring to melt, obtaining a melt; introducing argon gas for a first refining, online degassing, and slag removal; then performing a second refining, online degassing, and slag removal, and after standing, adding a casting modifier at a temperature of 700-750° C., filtering, and casting to obtain a cast rod with an average grain size of 135-137 μm. The first refining temperature is 750-760°C, and the first refining time is 20-30 minutes; the second refining temperature is 740-750°C, and the second refining time is 15-20 minutes; the casting speed is 115-130 mm / min; The ingot contains the following components in percentage: Si 0.12-0.13wt%, Mg 0.015-0.03wt%, Fe 0.1-0.15 wt%, Cu 0.015-0.03wt%, Mn 0.015-0.03wt%, Cr 0.015-0.03wt%, Zn 0.015-0.03wt%, Ti 0.015-0.03wt%, V 0.015-0.03wt%, Al≥99.6wt%, and unavoidable impurities; The extrusion method comprises controlling the extrusion die temperature to be 390-410° C., the extrusion barrel temperature to be 370-390° C., and the cast rod temperature to be 350-370° C.; the extrusion pulling speed to be 2.6-3 m / min, the extrusion speed to be 3-6 mm / s, extruding the cast rod, quenching the cast rod after the extrusion is completed, controlling the temperature of the profile entering the quenching zone to be 380-390° C., and the temperature of the profile exiting the quenching zone to be no greater than 40° C.; then controlling the stretching rate to be 1-2%, straightening the profile, and sawing the profile to obtain the aluminum skived-tooth radiator profile; The quenching cooling method is water spray cooling, and the water flow rate of the water spray cooling is 0.65-0.75m 3 / h.

2. The extrusion production method of the aluminum skived-tooth radiator profile according to claim 1, characterized in that: In the smelting and casting, the casting modifier is aluminum titanium boron wire, and the amount of the casting modifier added to each ton of melt is 0.04-0.05wt%.

3. An aluminum skived-tooth radiator profile, characterized in that: The aluminum skived-tooth radiator profile is produced by the production method according to claim 1 or 2; the average grain size of the aluminum skived-tooth radiator profile is 66-90 μm, the Barcol hardness is 38-40 HBA, and the depth of the macrostructure coarse grain layer is ≤1 mm.

4. An application of the aluminum skived-tooth radiator profile according to claim 3, characterized in that: The aluminum skived-tooth radiator profile is used to prepare a high-multiple aluminum skived-tooth radiator; the high-multiple tooth ratio is not less than 43 times; The skiving angle is controlled to be 11.7°, and the aluminum skived-tooth radiator profile is skived. The skiving tooth spacing is controlled to be 1.5-1.6mm, the tooth thickness is 1.0-1.1mm, and the high-multiple tooth multiple is not less than 43 times. After the skiving process is completed, the high-multiple tooth aluminum skived-tooth radiator is obtained by milling the surface.

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