CN112872032B - Vacuum brazing oil cooler bottom plate material and preparation method thereof - Google Patents
Vacuum brazing oil cooler bottom plate material and preparation method thereof Download PDFInfo
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- CN112872032B CN112872032B CN202011428334.0A CN202011428334A CN112872032B CN 112872032 B CN112872032 B CN 112872032B CN 202011428334 A CN202011428334 A CN 202011428334A CN 112872032 B CN112872032 B CN 112872032B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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Abstract
The invention discloses a vacuum brazing oil cooler bottom plate material and a preparation method thereof, wherein the preparation method comprises the following steps: and (3) composite hot rolling: the skin material and the core material are compounded and then hot rolled, so that a hot rolled plate is obtained; first cold rolling: carrying out multi-pass cold rolling on the hot rolled plate, wherein the deformation amount of each pass is 10-16%, and obtaining a cold rolled plate 1; and (3) primary annealing: carrying out recrystallization annealing on the cold-rolled sheet 1 to obtain a sheet material; and (3) cold rolling for the second time: carrying out multi-pass cold rolling on the plate, wherein the deformation amount of each pass is 10-16%, and obtaining a cold-rolled plate 2; and (3) secondary annealing: performing recrystallization annealing on the cold-rolled sheet 2; wherein the sheath material is 3003 aluminum alloy, and the core material is 6 series aluminum alloy. The preparation method prepares the composite material with the thickness of 2.20-4.00 mm and the average grain size of more than 400 mu m by adopting a method combining non-uniform treatment, small deformation cold rolling and recrystallization annealing, so as to solve the problems that the grains of the material produced by the conventional manufacturing method are tiny, and the brazing filler metal is easy to climb to the stamping mounting hole or the surface.
Description
Technical Field
The invention relates to the field of materials, in particular to a vacuum brazing oil cooler bottom plate material and a preparation method thereof.
Background
The oil cooler is an important part for ensuring the safe operation and the service life of an automobile engine in an automobile heat exchange system, and is an aluminum alloy integral welding structure formed by connecting a plurality of layers of densely arranged zigzag fins with a bottom plate, and the main production process is brazing one-step forming. The aluminum alloy composite plate has light weight, good corrosion resistance, good brazability and reliable performance, and is widely applied to an automobile heat exchange system.
The traditional automobile oil cooler bottom plate adopts 3 XX aluminum alloy and modified 3 XX aluminum alloy plates thereof, and the yield strength after brazing is generally lower, so that the requirement of the oil cooler bottom plate on the strength after butt welding cannot be met. At present, 6 series aluminum alloy plates with certain ageing strengthening are adopted to meet the requirement of the bottom plate of the oil cooler on the post-braze strength. Since the 6-series aluminum alloy brazing sheet contains 0.35 to 1.0wt.% of Mg, the Mg element forms Mg vapor during brazing and O in the braze furnace 2 、CO 2 、N 2 After the reaction, black reaction products are generated on the surface of the part, and the surface quality of the part is seriously affected. At the same time, mg and MgO react with the brazing flux to generate MgF 2 The melting point of the brazing flux is increased to lose activity, and the quality of Controlled Atmosphere Brazing (CAB) is seriously affected, so that a Vacuum Brazing (VB) mode is generally adopted when the 6-series aluminum alloy plate is used as a bottom plate of an oil cooler.
The vacuum brazed Al-Si connection layer generally contains about 1.5% of Mg element, and the existence of the element reduces the melting point of the Al-Si brazing layer, so that the fluidity of the molten brazing layer is greatly increased, and the molten brazing layer is extremely easy to flow to punching holes and climb up the outer surface of the bottom plate of the oil cooler in the brazing process, thereby forming a "climbing" phenomenon. The solidified brazing filler metal in the punching hole can reduce the inner hole diameter of the punching hole, so that the assembly of the oil cooler is affected; the solder climbs to the outer surface through the inner hole, so that the corrosion of the surface is easy to cause the surface to be dark and grey, and the appearance and the corrosion performance of the oil cooler in the service process are affected due to the fact that the surface is uneven.
Disclosure of Invention
Aiming at the defects that the 6-series aluminum alloy for the bottom plate of the conventional vacuum brazing oil cooler and the composite material thereof are not attractive after brazing and are easy to climb up, the invention discloses the bottom plate material of the vacuum brazing oil cooler and the preparation method thereof, the prepared material has coarse grains, the average grain size is more than 400 mu m, the brazing material has no climbing up phenomenon, and the surface color is uniform.
The invention aims at providing a preparation method of a vacuum brazing oil cooler bottom plate material, which comprises the following steps:
and (3) composite hot rolling: the skin material and the core material are compounded and then hot rolled, so that a hot rolled plate is obtained; first cold rolling: carrying out multi-pass cold rolling on the hot rolled plate, wherein the deformation amount of each pass is 10-16%, and obtaining a cold rolled plate 1; and (3) primary annealing: carrying out recrystallization annealing on the cold-rolled sheet 1 to obtain a sheet material; and (3) cold rolling for the second time: carrying out multi-pass cold rolling on the plate, wherein the deformation amount of each pass is 10-16%, and obtaining a cold-rolled plate 2; and (3) secondary annealing: performing recrystallization annealing on the cold-rolled sheet 2; wherein the sheath material is 3003 aluminum alloy, and the core material is 6 series aluminum alloy.
Preferably, the temperature of the first annealing and the second annealing is 370-410 ℃, and the heat preservation time is 3-6 h.
Preferably, the thickness of the aluminum alloy composite material is 2.20-4.00 mm, and the aluminum alloy composite material comprises a three-layer structure which is respectively a skin material, a core material and a skin material; wherein, the single-layer leather accounts for 3-6%.
Preferably, the 6-series aluminum alloy is 6061, 6063 or 6a02 aluminum alloy.
Preferably, before the hot-rolling, the method further comprises:
alloy casting: alloy ingots were cast by a semi-continuous casting method.
Preferably, before the hot-rolling, the method further comprises:
preparation of the skin material: and hot-rolling the skin ingot for multiple times, wherein the hot-rolling temperature is 440-480 ℃, and the heat preservation time is 4-8 h.
Preferably, in the composite hot rolling, the hot rolling temperature is 440-480 ℃ and the heat preservation time is 4-8 h; the thickness of the hot rolled plate is 5.0-8.0 mm.
Preferably, the number of times of the first cold rolling and the second cold rolling is 2;
preferably, the preparation method further comprises a third cold rolling and a third annealing according to the thickness requirement of the finished product.
It is another object of the present invention to provide a vacuum brazing oil cooler soleplate material, which is manufactured by the method as set forth in any one of the above, and which has a thickness of 2.20-4.00 mm.
Preferably, the average grain size of the vacuum brazing oil cooler soleplate material is greater than 400 μm.
The invention discloses a preparation method of a bottom plate material of a vacuum brazing oil cooler, which comprises the following process flows: alloy casting, sawing and milling, skin preparation, composite hot rolling, first cold rolling, first annealing, second cold rolling, second annealing (→third cold rolling→third annealing). The process combines non-homogenization treatment of aluminum alloy, multi-pass 10-16% critical deformation cold rolling and recrystallization annealing to prepare 3003/6XX/3003 composite board with thickness of 2.20-4.00 mm and coarse grain structure (grain size is more than 400 μm). The bottom plate material of the vacuum brazing oil cooler adopts 3003 brazing aluminum alloy with the thickness compounding ratio of 3-6% and no easily-oxidizable elements as the upper surface and the lower surface, and has bright and uniform surface and attractive surface and no climbing material after brazing at 600 ℃. The 3003 aluminum alloy and the 6 aluminum alloy have coarse grain structure, the average grain size is more than 400 mu m along the rolling direction, and the problems that the grains of the materials produced by the conventional manufacturing method are fine and the brazing filler metal easily climbs to the stamping mounting hole or the surface are solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art from these drawings without departing from the scope of protection of the present application.
FIG. 1 is a schematic view showing the structure of a hot rolled sheet according to an embodiment of the present invention;
FIG. 2 is a flow chart of preparing a vacuum brazing oil cooler soleplate material according to an embodiment of the present invention;
FIG. 3 is a metallographic structure diagram of a vacuum brazing oil cooler soleplate material according to an embodiment of the present invention;
FIG. 4 is a diagram showing a metallographic structure of a vacuum brazing oil cooler bottom plate material after brazing according to an embodiment of the present invention;
FIG. 5 is a metallographic structure diagram of a vacuum brazing oil cooler soleplate material according to another embodiment of the present invention;
FIG. 6 is a metallographic view of a further embodiment of the invention vacuum brazing of an oil cooler soleplate material;
FIG. 7 is a metallographic structure diagram of a comparative vacuum brazing oil cooler soleplate material;
FIG. 8 is a metallographic structure diagram of a comparative example after brazing of a vacuum brazing oil cooler bottom plate material;
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are obtained by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
In the embodiment shown in fig. 1, the vacuum brazing oil cooler bottom plate material is not subjected to homogenization treatment, and 100 is formed by hot rolling and compounding of a skin material 110 and a core material 120, and then carrying out multi-pass cold rolling with 10-16% critical deformation and recrystallization annealing. Wherein, the skin material, the core material and the skin material are stacked and bundled in the sequence from top to bottom. The leather material is 3003 aluminum alloy; the 6 series aluminum alloy is 6061, 6063 or 6A02 aluminum alloy.
The composite ratio is the thickness proportion of the composite material, the thickness of the aluminum alloy composite material is 2.20-4.00 mm, and the aluminum alloy composite material comprises a three-layer structure which is respectively a skin material, a core material and a skin material; wherein the composite ratio of the single-layer leather is 3-6%.
The average grain size of the vacuum brazing oil cooler soleplate material of the invention is more than 400 mu m.
The preparation method of the vacuum brazing oil cooler bottom plate material provided by the invention comprises the following steps: composite hot rolling, first cold rolling, first annealing, second cold rolling and second annealing. As shown in fig. 2, specifically:
and (3) composite hot rolling: the skin material and the core material are compounded and then hot rolled, so that a hot rolled plate is obtained; the hot rolling temperature is 440-480 ℃ and the heat preservation time is 4-8 h; the thickness of the hot rolled plate is 5.0-8.0 mm.
First cold rolling: carrying out multi-pass cold rolling on the hot rolled plate, wherein the deformation amount of each pass is 10-16%, and obtaining a cold rolled plate 1 with the thickness of 3.50-6.50 mm;
and (3) primary annealing: carrying out recrystallization annealing on the cold-rolled sheet 1 to obtain a sheet material; the temperature is 370-410 ℃, and the heat preservation time is 3-6 h.
And (3) cold rolling for the second time: carrying out multi-pass cold rolling on the plate, wherein the deformation amount of each pass is 10-16%, and obtaining a cold-rolled plate 2 with the thickness of 2.50-5.30 mm;
and (3) secondary annealing: performing recrystallization annealing on the cold-rolled sheet 2; the temperature is 370-410 ℃, and the heat preservation time is 3-6 h.
Optionally, the preparation method further comprises:
annealing: and (3) carrying out recrystallization annealing on the composite coil, wherein the annealing temperature is 370-410 ℃, and the heat preservation time is 3-6 h, so as to obtain the aluminum alloy composite material for brazing without soldering flux.
Preferably, before the hot-compounding, further comprising:
alloy casting: alloy ingots were cast by a semi-continuous casting method.
Sawing and milling: and sawing the head and the tail of the alloy ingot and milling the surface.
Preferably, the method further comprises the preparation of the skin material before the composite hot rolling, wherein the preparation of the skin material comprises the steps of hot rolling the skin material ingot for a plurality of times, wherein the hot rolling temperature is 440-480 ℃, and the heat preservation time is 4-8 h.
Preferably, the number of times of the first cold rolling and the second cold rolling is 2;
preferably, the preparation method further comprises a third cold rolling and a third annealing according to the thickness requirement of the finished product:
third cold rolling: and performing multi-pass cold rolling according to the pass deformation of 10-16%.
And (3) annealing for the third time: preserving heat for 3-6 hours in a furnace with the temperature of 370-410 ℃ to obtain the vacuum brazing oil cooler bottom plate material. The thickness is 2.20-4.00 mm.
Further, in the third cold rolling, the multi-pass cold rolling is 2 passes.
Example 1
The bottom plate material of the vacuum brazing oil cooler provided by the embodiment is 3003 aluminum alloy as a skin material and 6A02 aluminum alloy as a core material.
The preparation process of the vacuum brazing oil cooler bottom plate material is shown in fig. 2, and specifically comprises the following steps:
alloy casting: the alloys were melted according to the alloy compositions 3003, 6a02, and 3003 and 6a02 alloy ingots having dimensions of 450×1620×7000mm were cast by a semi-continuous casting method.
Sawing and milling: after sawing the head and tail and milling the surface, the size of the two alloy ingots is about 430×1620×6500mm.
Preparation of the skin material: after 3003 aluminum alloy is heated to 440 ℃ and is kept for 6 hours, hot rolling is carried out for 29.5mm by multiple passes, and the thick plate with the length of 6500mm is manufactured by cutting.
And (3) composite hot rolling: the method comprises the steps of stacking a 430mm 6A02 aluminum alloy cast ingot and a 29.3mm 3003 aluminum alloy sheet subjected to surface treatment in sequence from top to bottom, heating to 440 ℃, preserving heat for 6 hours, and then carrying out repeated hot rolling to 8.0mm by multiple passes, wherein the final rolling temperature is higher than 300 ℃.
First cold rolling: cold rolling the hot rolled plate cooled to room temperature to 7.20mm for the first time, wherein the pass deformation is 10%; the second pass cold rolling to 6.40mm, the pass deformation is 11%.
And (3) primary annealing: incubate in a 390℃oven for 4.5 hours.
And (3) cold rolling for the second time: cold rolling the sheet material with the thickness of 6.40mm cooled to room temperature to 5.75mm for the first time, wherein the pass deformation is 10%; the second pass cold rolling to 5.17mm, the pass deformation is 10%.
And (3) secondary annealing: incubate in a 390℃oven for 4.5 hours.
Third cold rolling: cold rolling the 5.17mm plate cooled to room temperature to 4.50mm for the first time, wherein the pass deformation is 13%; the second pass cold rolling to 3.20mm, the pass deformation is 11%.
And (3) annealing for the third time: the temperature was kept in a 390℃furnace for 4.5 hours to obtain a 4.00mm vacuum brazing oil cooler soleplate material.
The 3003 layer of the vacuum brazing oil cooler soleplate material was 6% in composition. After vacuum brazing with other plates with brazing filler metal, the surfaces are shiny and consistent in color, no climbing material is seen on the surfaces of 3003 layers, and the average grain size of the metallographic phase display 6A02 layer in the horizontal direction is about 500 mu m, as shown in figures 3 and 4.
Example 2
The bottom plate material of the vacuum brazing oil cooler is made of 3003 aluminum alloy, and the core material is 6061 aluminum alloy.
The preparation process of the vacuum brazing oil cooler bottom plate material is shown in fig. 2, and specifically comprises the following steps:
alloy casting: the alloy was melted according to the alloy compositions of 3003 and 6061, and 3003 and 6061 alloy ingots having a size of 450×1620×7000mm were cast by a semi-continuous casting method.
Sawing and milling: after sawing the head and tail and milling the surface, the size of the two alloy ingots is about 430×1620×6500mm.
Preparation of the skin material: after 3003 aluminum alloy is heated to 480 ℃ and is kept for 4 hours, hot rolling is carried out for 14mm by multiple times, and the aluminum alloy is cut into thick plates with the length of 6500mm.
And (3) composite hot rolling: 430mm 6061 aluminum alloy cast ingot and 3003 aluminum alloy plate with 13.7mm after surface treatment are stacked in sequence from top to bottom according to 3003-6061-3003, heated to 480 ℃ and kept for 4 hours, and then repeatedly hot-rolled to 5.0mm through multiple passes, wherein the final rolling temperature is more than 300 ℃.
First cold rolling: cold rolling the hot rolled plate cooled to room temperature to 4.5mm for the first time, wherein the pass deformation is 10%; the second pass cold rolling to 3.80mm, and the pass deformation is 15.5%.
And (3) primary annealing: incubate in an oven at 410℃for 3 hours.
And (3) cold rolling for the second time: cold rolling the sheet material with the thickness of 3.80mm cooled to room temperature to 3.20mm for the first time, wherein the pass deformation is 16%; the second pass cold rolling to 2.88mm, the pass deformation is 10%.
And (3) secondary annealing: incubate in an oven at 410℃for 3 hours.
Third cold rolling: cold rolling the sheet material with the thickness of 2.88mm cooled to room temperature to 2.45mm for the first time, wherein the pass deformation is 15%; and cold rolling to 2.20mm in the second pass, wherein the pass deformation is 10%.
And (3) annealing for the third time: the mixture was incubated in a 410℃oven for 3 hours to give a 2.20mm vacuum brazing oil cooler soleplate material.
The 3003 layers of the vacuum brazing oil cooler soleplate material had a composite ratio of 3%. After vacuum brazing with other plates with brazing filler metal, the surface is shiny and consistent in color, no climbing material is seen on the surface of 3003 layers, and the average grain size of a metallographic phase display 6061 layer in the horizontal direction is about 450 mu m, as shown in fig. 5.
Example 3
The bottom plate material of the vacuum brazing oil cooler is made of 3003 aluminum alloy, and the core material is 6063 aluminum alloy.
The preparation process of the vacuum brazing oil cooler bottom plate material is shown in fig. 2, and specifically comprises the following steps:
alloy casting: the alloy was melted according to the alloy compositions of 3003 and 6063, and 3003 and 6063 alloy ingots were cast by a semi-continuous casting method, the ingot size being 450×1620×7000mm.
Sawing and milling: after sawing the head and tail and milling the surface, the size of the two alloy ingots is about 430×1620×6500mm.
Preparation of the skin material: after 3003 aluminum alloy is heated to 440 ℃ and is kept warm for 8 hours, hot rolling is carried out for 21.6mm by multiple passes, and the thick plate with the length of 6500mm is manufactured by cutting.
And (3) composite hot rolling: 430mm 6063 aluminum alloy cast ingots and 3003 aluminum alloy plates with the surface treated thickness of 21.3mm are stacked in sequence from top to bottom according to 3003-6063-3003, heated to 440 ℃ and heat-preserved for 8 hours, and then repeatedly hot-rolled to 5.5mm by multiple passes, wherein the final rolling temperature is higher than 300 ℃.
First cold rolling: cold rolling the hot rolled plate cooled to room temperature to 4.70mm for the first time, wherein the pass deformation is 14%; the second pass cold rolling to 4.00mm, and the pass deformation is 15%.
And (3) primary annealing: incubate in a furnace at 370℃for 6 hours.
And (3) cold rolling for the second time: cold rolling the 4.00mm plate cooled to room temperature to 3.60mm for the first time, wherein the pass deformation is 10%; the second pass cold rolling to 3.20mm, the pass deformation is 12.5%.
And (3) secondary annealing: the mixture was incubated in a furnace at 370℃for 6 hours to give a 3.20mm vacuum brazing oil cooler soleplate material.
The 3003 layer thickness composite ratio of the vacuum brazing oil cooler soleplate material was 4.5%. After vacuum brazing with other plates with brazing filler metal, the surface is shiny and consistent in color, no climbing is seen on the surface of 3003 layers, and the average grain size of a metallographic phase 6063 layer in the horizontal direction is about 410 mu m, as shown in fig. 6.
Comparative example 1
The comparative example was prepared by another preparation method for a vacuum brazing oil cooler bottom plate material, the skin material was 3003 aluminum alloy, and the core material was 6061 aluminum alloy. The preparation process comprises the following steps:
alloy casting: the alloy was melted according to the alloy compositions of 3003 and 6061, and 3003 and 6061 alloy ingots having a size of 450×1620×7000mm were cast by a semi-continuous casting method.
Homogenizing: the ingot is kept warm in a 600 ℃ furnace for 16 hours, and homogenization treatment is carried out. Sawing and milling: after sawing the head and tail and milling the surface, the size of the two alloy ingots is about 430×1620×6500mm.
Preparation of the skin material: after 3003 aluminum alloy is heated to 440 ℃ and is kept warm for 8 hours, hot rolling is carried out for 21.6mm by multiple passes, and the thick plate with the length of 6500mm is manufactured by cutting.
And (3) composite hot rolling: 430mm 6063 aluminum alloy cast ingots and 3003 aluminum alloy plates with the surface treated thickness of 21.3mm are stacked in sequence from top to bottom according to 3003-6063-3003, heated to 440 ℃ and heat-preserved for 8 hours, and then repeatedly hot-rolled to 6.0mm through multiple passes, wherein the final rolling temperature is higher than 300 ℃.
Cold rolling: cold rolling the hot rolled plate with the thickness of 6.0mm cooled to room temperature to 4.50mm for the first time, wherein the pass deformation is 25%; cold rolling to 3.60mm in the second pass, wherein the pass deformation is 20%; cold rolling for the third time to 3.0mm, wherein the pass deformation is 16.7%; and the fourth pass cold rolling to 2.50mm, wherein the pass deformation is 16.7%. The total cold rolling deformation is about 58%.
Annealing: preserving heat in a 380 ℃ furnace for 5 hours, and cooling to obtain the bottom plate material of the vacuum brazing oil cooler with the thickness of 2.50 mm.
The 3003 layer thickness composite ratio of this material was 4.5%. After vacuum brazing with other sheets with braze, the metallographic images showed an average grain size of the core material of about 100 μm, as shown in fig. 7. The surface of the material near the punching hole is blackened and uneven, and metallographic pictures show that the brazing filler metal climbs from the edge of the plate to the surface to generate a melting phenomenon, as shown in fig. 8.
The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples have been provided herein to illustrate the principles and embodiments of the present application, and wherein the above examples are provided to assist in the understanding of the methods and concepts of the present application. Meanwhile, based on the ideas of the present application, those skilled in the art can make changes or modifications on the specific embodiments and application scope of the present application, which belong to the scope of the protection of the present application. In view of the foregoing, this description should not be construed as limiting the application.
Claims (6)
1. A method for preparing a vacuum brazing oil cooler soleplate material having an average grain size of more than 400 μm, comprising:
and (3) composite hot rolling: stacking the skin material and the core material from top to bottom in the order of skin material-core material-skin material, and then hot rolling to obtain a hot rolled plate; in the composite hot rolling, the hot rolling heating temperature is 440-480 ℃ and the heat preservation time is 4-8 hours; the thickness of the hot rolled plate is 5.0-8.0 mm;
first cold rolling: carrying out multi-pass cold rolling on the hot rolled plate, wherein the deformation amount of each pass is 10-16%, and obtaining a cold rolled plate 1;
and (3) primary annealing: carrying out recrystallization annealing on the cold-rolled sheet 1 to obtain a sheet material;
and (3) cold rolling for the second time: carrying out multi-pass cold rolling on the plate, wherein the deformation amount of each pass is 10-16%, and obtaining a cold-rolled plate 2;
and (3) secondary annealing: carrying out recrystallization annealing on the cold-rolled sheet 2 to obtain a sheet 2;
third cold rolling: carrying out multi-pass cold rolling on the plate 2, wherein the deformation amount of each pass is 10-16%, and obtaining a cold-rolled plate 3;
annealing for the third time; carrying out recrystallization annealing on the cold-rolled sheet 3 to obtain a vacuum brazing oil cooler bottom plate material with an average grain size of more than 400 mu m; the thickness of the bottom plate material of the vacuum brazing oil cooler is 2.20-4.00 mm;
wherein the skin material is 3003 aluminum alloy, and the core material is 6 series aluminum alloy; the aluminum alloy is not subjected to homogenization treatment;
the temperature of the first annealing, the second annealing and the third annealing is 370-410 ℃, and the heat preservation time is 3-6 h.
2. The method of claim 1, wherein the vacuum brazing oil cooler soleplate material comprises a three-layer structure, namely a skin material, a core material and a skin material; wherein, the thickness of the single-layer skin material accounts for 3-6% of the thickness of the bottom plate material of the vacuum brazing oil cooler.
3. The method according to claim 1, wherein the 6-series aluminum alloy is 6061, 6063 or 6a02 aluminum alloy.
4. The method of manufacturing according to claim 1, further comprising, prior to the composite hot rolling:
alloy casting: and smelting alloy according to the alloy components of the skin material and the core material, and casting skin material cast ingots and core material cast ingots by adopting a semi-continuous casting method.
5. The method according to claim 4, further comprising, before the composite hot rolling:
preparation of the skin material: and hot-rolling the skin ingot for multiple times, wherein the hot-rolling heating temperature is 440-480 ℃, and the heat preservation time is 4-8 hours.
6. A vacuum brazing oil cooler soleplate material prepared according to the method of any one of claims 1 to 5, characterised in that the vacuum brazing oil cooler soleplate material has an average grain size of more than 400 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011428334.0A CN112872032B (en) | 2020-12-09 | 2020-12-09 | Vacuum brazing oil cooler bottom plate material and preparation method thereof |
Applications Claiming Priority (1)
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| CN103276149B (en) * | 2013-06-13 | 2014-07-16 | 广西南南铝加工有限公司 | Preparation method of aluminum alloy composite material for automobile heat exchanger |
| CN105478474A (en) * | 2015-12-16 | 2016-04-13 | 银邦金属复合材料股份有限公司 | Method for compounding aluminum alloy composite board used for machining automobile oil cooler bottom board |
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| CN111299322A (en) * | 2020-03-16 | 2020-06-19 | 银邦金属复合材料股份有限公司 | Preparation method of brazing aluminum alloy material and brazing aluminum alloy material |
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