CN111394624A - High-strength composite aluminum material for partition plate of oil cooler of engineering machinery produced by cold rolling composite method and manufacturing method thereof - Google Patents
High-strength composite aluminum material for partition plate of oil cooler of engineering machinery produced by cold rolling composite method and manufacturing method thereof Download PDFInfo
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- 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
- C22F1/057—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 copper as the next major constituent
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Abstract
The invention belongs to the technical field of aluminum processing, and relates to a high-strength composite aluminum material for an engineering machinery oil cooler partition plate produced by a cold rolling composite method and a manufacturing method thereof, wherein the composite aluminum material consists of a core material and brazing clad materials on the upper surface and the lower surface, and the core material comprises the following components in percentage by weight: fe is less than or equal to 0.5 percent, Si: less than or equal to 0.3 percent, Cu: 0.50-0.70%, Mn: 0.65-1.0%, Mg: 0.1-0.3%, Zn: less than or equal to 0.1 percent, Zr: less than or equal to 0.05 percent, Ti: less than or equal to 0.1 percent, less than or equal to 0.05 percent of other elements, less than or equal to 0.15 percent of the total amount and the balance of aluminum. The high-strength composite aluminum material has excellent mechanical properties after brazing, and the yield strength after brazing reaches 60-70 MPa.
Description
Technical Field
The invention relates to an aluminum alloy composite strip produced by a cold rolling composite method and a manufacturing method thereof, in particular to a high-strength composite aluminum material for an engineering machinery oil cooler partition plate produced by the cold rolling composite method and a manufacturing method thereof, belonging to the technical field of aluminum material processing.
Background
The oil cooler is mainly used for cooling lubricating oil or fuel oil of engines of vehicles, engineering machinery, ships and the like. The hot side of the product is lubricating oil or fuel oil, and the cold side can be cooling water or air. In the running process of the vehicle, lubricating oil in each large lubricating system passes through the hot side channel of the oil cooler by means of the power of an oil pump to transfer heat to the cold side of the oil cooler, and cooling water or cold air takes away the heat through the cold side channel of the oil cooler, so that heat exchange between cold and hot fluids is realized, and the lubricating oil is ensured to be at a proper working temperature. Including cooling engine oil, automatic transmission oil, power steering gear oil, and the like. The main material of the product comprises metal materials such as aluminum, copper, stainless steel, castings and the like, and after welding or assembly, the hot side channel and the cold side channel are connected into a complete heat exchanger.
The materials of the oil cooler are mainly two types: aluminum and copper, the former being used for general passenger vehicles and the latter being used for large commercial vehicles; oil cooler materials and manufacturing techniques are developing rapidly. Aluminum oil coolers are used for replacing copper oil coolers in the fields of cars and light vehicles due to the obvious advantages of the aluminum oil coolers in light weight of materials, and the aluminum oil coolers are the absolute mainstream configuration of passenger vehicles at present.
At present, the aluminum oil cooler mainly comprises a plurality of components: mainboard, baffle, cooling tube and fin. The main plate and the side plate mainly play a structural supporting role, so the main plate and the side plate are required to have good processing performance, corrosion resistance, brazing performance and strength. At present, the most common main plate and partition plate materials are mainly 3 series aluminum alloy composite plates, and the strength of the 3 series aluminum alloy after brazing is lower, so that the method of thickening the oil cooler partition plate material is mainly adopted to ensure the strength of the partition plate material, so that the use cost of the material is improved, and the weight of engineering machinery or automobiles is increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the high-strength composite aluminum material for the partition plate of the oil cooler of the engineering machinery, which is produced by a cold composite method, and solves the problems that the yield strength is low (35-45 MPa) after common 3003MOD welding, the anti-explosion pressure is insufficient after the oil cooler is welded into a workpiece, and the aluminum material is not suitable for manufacturing the oil cooler of the engineering machinery or the automobile. The technical scheme of the invention can be used as the material of the oil cooler partition plate, thereby improving the structural strength of the whole radiator of the material and simultaneously reducing the weight of the whole part.
The technical scheme of the invention is as follows:
the high-strength composite aluminum material for the engineering machinery oil cooler partition plate produced by the cold rolling composite method comprises a core material and two layers of brazing clad materials, wherein the two layers of brazing clad materials are respectively compounded on the upper surface and the lower surface of the core material, the thickness of each layer of brazing clad material is 5-10% of the total thickness of the aluminum material, and the core material comprises the following components in percentage by weight: fe is less than or equal to 0.5 percent, Si: less than or equal to 0.3 percent, Cu: 0.50-0.70%, Mn: 0.65-1.0%, Mg: 0.1-0.3%, Zn: less than or equal to 0.1 percent, Zr: less than or equal to 0.05 percent, Ti: less than or equal to 0.1 percent, less than or equal to 0.05 percent of single content of other elements, less than or equal to 0.15 percent of total content of other elements and the balance of aluminum; the brazing layer skin material is aluminum-silicon alloy, and the brazing layer skin material comprises the following components in percentage by weight: fe: less than or equal to 0.80%, Si: 8.0 to 11.0%, Cu: less than or equal to 0.20 percent, Mn: less than or equal to 0.05 percent, Zn: less than or equal to 0.1 percent, Ti: less than or equal to 0.05 percent, less than or equal to 0.05 percent of single other elements, less than or equal to 0.15 percent of the total amount of the other elements and the balance of aluminum.
A high-strength composite aluminium material for the partition board of oil cooler is prepared through continuously casting and rolling the core material and brazing layer and skin material alloy to obtain core material blank and brazing layer and skin material blank, cold rolling to form the structure of brazing layer-core material-brazing layer, and finish rolling.
Preferably, the method comprises the following steps:
respectively smelting a brazing layer skin material and a core material according to the chemical components in the claim 1 to obtain a smelted brazing layer skin material aluminum alloy and a smelted core material aluminum alloy;
continuously casting and rolling the smelted brazing layer skin material aluminum alloy and core material aluminum alloy into a brazing layer skin material cast-rolled plate and a core material cast-rolled plate respectively;
preparing a core material cast-rolled plate into a core material blank;
preparing a brazing layer skin material casting and rolling plate into a brazing layer skin material blank;
rolling the core material blank and the brazing layer skin material blank by a cold rolling composite rolling mill, and carrying out processing, rolling and compounding to obtain a 1.6-3.2mm cold rolling composite plate;
tightening a steel strip on the surface of an aluminum coil plate of the cold-rolled composite plate, performing diffusion annealing in an annealing furnace, heating to the target heating temperature of 420-;
cold rolling the cold-rolled composite plate after diffusion annealing into a composite plate with the thickness of 0.45-1.2 mm, and performing finishing and trimming by a slitting machine to obtain an aluminum coil after finishing and trimming;
carrying out pre-finished product annealing treatment on the finished and trimmed aluminum coil, and fixing the surface of the aluminum coil by using a high-temperature adhesive tape during annealing;
and (5) performing finish rolling on the aluminum alloy composite strip obtained after the pre-finished product annealing treatment, and rolling into a finished product.
Preferably, the thickness of the finished aluminum alloy composite strip is 0.3-0.5 mm.
Preferably, the obtained finished product is cut, packaged and put in storage.
Preferably, the step of preparing the core material cast-rolled plate into the core material blank comprises the following steps: cold rolling the core material cast-rolled plate prepared by the continuous casting-rolling method to obtain a plate with the thickness of 3.8-5.2mm, welding an outer ring, tightening a steel belt on the plate surface, annealing in an annealing furnace, discharging from the furnace and air cooling to obtain a core material blank; the annealing conditions were as follows: heating to the target heating temperature of 580 ℃ within 3h, preserving the heat for 24-26h, and then discharging and air cooling.
Preferably, the step of preparing the brazing layer skin material cast-rolled plate into the brazing layer skin material blank comprises the following steps: performing blank heat treatment on a brazing layer skin material cast-rolled plate prepared by a continuous casting-rolling method, performing first cold rolling until the thickness of the brazing layer skin material cast-rolled plate is 0.4-0.75mm, and then performing finishing trimming by a slitting mill, wherein the width of the trimming of the brazing layer skin material is the width matched with the prepared core material; after finishing treatment, pulling and straightening the correction plate type, and cleaning surface residual oil; performing a second heat treatment after the straightening and cleaning.
Preferably, the blank heat treatment step is as follows: welding the inner ring and the outer ring, tightening the steel belt on the surface of the steel belt, and annealing in an annealing furnace, wherein the annealing conditions are as follows: heating to the target heating temperature of 500-540 ℃ within 2-4h, preserving the heat for 10-18h, then transferring to the temperature of 480-520 ℃ and preserving the heat for 2-6h, and taking out from the furnace and air cooling.
Preferably, the second heat treatment comprises the following specific steps: and (3) tightening the steel strip on the plate surface, annealing in an annealing furnace, heating to the target heating temperature of 430-470 ℃ within 2-4h, preserving heat for 8-12h, rotating to the temperature of 360-410 ℃ and preserving heat for 2-5h, and then discharging from the furnace and air cooling to obtain the brazing layer skin material blank.
Preferably, the annealing treatment before the finished product comprises the following steps: heating to 240-plus-one temperature for 2-5h at 280 ℃, transferring to 350-plus-one temperature for 8-12h at 450 ℃, and then transferring to 320-plus-one temperature for 2h at 360 ℃.
Preferably, the cold rolling composite pass reduction rate is 55 +/-5%.
The invention provides a high-strength composite aluminum material for an engineering machinery oil cooler partition plate, which consists of a core material and a brazing layer, wherein the brazing layer is at least arranged on one surface of the core material, the thickness of each brazing layer accounts for 5-10% of the total thickness, and the core material comprises the following components in percentage by weight: fe is less than or equal to 0.5 percent, Si: less than or equal to 0.3 percent, Cu: 0.50-0.70%, Mn: 0.65-1.0%, Mg: 0.1-0.3%, Zn: less than or equal to 0.1 percent, Zr: less than or equal to 0.05 percent, Ti: less than or equal to 0.1 percent, less than or equal to 0.05 percent of single content of other elements, less than or equal to 0.15 percent of total amount and the balance of aluminum; the brazing layer is aluminum-silicon alloy, and the aluminum-silicon alloy comprises the following components in percentage by weight: fe: less than or equal to 0.80%, Si: 8.0 to 11.0%, Cu: less than or equal to 0.20 percent, Mn: less than or equal to 0.05 percent, Zn: less than or equal to 0.1 percent, Ti: less than or equal to 0.05 percent, less than or equal to 0.05 percent of other elements, less than or equal to 0.15 percent of the total amount and the balance of aluminum.
Preferably, the core material comprises the following components in percentage by weight: 0.3-0.45% of Fe, Si: 0.2 to 0.3%, Cu: 0.50-0.70%, Mn: 0.7-1.0%, Mg: 0.1 to 0.25%, Zn: less than or equal to 0.1 percent, Zr: less than or equal to 0.05 percent, Ti: less than or equal to 0.1 percent, less than or equal to 0.05 percent of other elements, less than or equal to 0.15 percent of the total amount and the balance of aluminum.
The invention also discloses a preparation method of the high-strength composite aluminum material for the partition plate of the oil cooler of the engineering machinery, which is produced by the cold rolling composite method, and the preparation method comprises the following steps:
(1) aluminum alloy smelting: smelting an aluminum alloy raw material according to chemical components of the core material and the brazing layer skin material to obtain a smelted brazing layer skin material aluminum alloy and a core material aluminum alloy;
(2) continuous casting and rolling;
(3) preparing a core material: the core material cast-rolled plate prepared by the continuous casting and rolling method in the step (2) is cold-rolled to obtain a plate with the thickness of 3.8-5.2mm, the outer ring is welded, the steel strip is tightened on the plate surface, and annealing is carried out in an annealing furnace, wherein the specific annealing conditions are as follows: heating to the target heating temperature of 580 ℃ within 3h, preserving heat for 24-26h, and then discharging from the furnace for air cooling to obtain a core material blank;
(4) preparing a brazing layer material: and (3) performing blank heat treatment on the brazing layer skin material cast-rolled plate prepared by the continuous casting-rolling method in the step (2), wherein the blank heat treatment comprises the following specific steps: heating to the target heating temperature of 500 ℃ and 540 ℃ within 2-4h, preserving the heat for 16-22h, and then discharging and air cooling; performing the blank heat treatment on the brazing layer skin material cast-rolled plate prepared by the continuous casting and rolling method in the step (2), then performing first cold rolling to 0.4-0.75mm, and then performing finishing trimming by a slitting machine, wherein the trimming size is the width matched with the prepared core material; after finishing treatment, pulling and straightening the correction plate type, and cleaning surface residual oil; and (3) carrying out secondary heat treatment after withdrawal, straightening and cleaning, wherein the specific conditions of the secondary heat treatment are as follows: heating to the target heating temperature of 430-470 ℃ within 2-4h, preserving heat for 8-12h, rotating to the temperature of 360-410 ℃ and preserving heat for 2-5h, and then taking out from the furnace and air cooling to obtain a brazing layer skin material blank;
(5) cold rolling and compounding: rolling the brazing layer skin material blank and the core material blank obtained in the steps (3) and (4) by a cold compound rolling mill, and processing, rolling and compounding at a proper processing rate to obtain a 1.8-3.0mm cold-rolled composite plate;
the cold rolling compounding realizes the combination of the brazing layer and the core material, the traditional hot rolling compounding can be realized only by surface treatment (cleaning), matching of the core material and the brazing layer, heating and hot rolling compounding, and the cold rolling compounding of the invention integrates the surface treatment, the matching of the core material and the brazing layer and the cold rolling compounding together, and can be completed by one process, thereby greatly improving the production efficiency. The thickness control precision of the core material and the brazing layer material in the preparation process is high, and the surface treatment of cold rolling compounding is realized in a mechanical automation mode, so that the surface treatment effect and the stability of the cladding rate can be effectively ensured.
(6) And (3) diffusion annealing: tightening a steel strip on the surface of the cold-rolled composite plate obtained in the step (5), and performing diffusion annealing in an annealing furnace to obtain a cold-rolled composite plate after diffusion annealing; the specific conditions of the diffusion annealing are as follows: heating to the target heating temperature of 420-;
the higher driving force stored in the composite process and the high-temperature diffusion annealing can effectively promote the metal diffusion so as to improve the bonding depth and the strength of the metal.
(7) Rolling the diffusion annealed cold-rolled composite plate obtained in the step (6) into a composite plate with the thickness of 0.5-0.8 mm, and then performing finishing trimming by a slitting machine to obtain an aluminum coil subjected to finishing trimming;
(8) annealing treatment before the finished product is carried out on the aluminum coil after finishing and trimming in the step (7), the surface of the aluminum coil before annealing is pasted with a high-temperature adhesive tape so as to fix the surface of the aluminum coil (the high-temperature adhesive tape on the surface of the aluminum coil does not drop and keeps the adhesion with the aluminum coil during annealing), the outer ring of the aluminum coil is prevented from being blown away by a circulating fan during annealing, and the specific conditions of the annealing treatment before the finished product are as follows: heating to 240-temperature and 280-temperature for 2-5h after 1-2h, transferring to 420-temperature and 450-temperature and preserving for 8-12h, and then transferring to 320-temperature and 360-temperature and preserving for 2 h;
(9) performing finish rolling on the aluminum alloy composite strip obtained after the pre-annealing treatment of the finished product in the step (8), and rolling the finished product to ensure that the thickness of the finished aluminum alloy composite strip is 0.3-0.5 mm;
(10) cutting and packaging: and cutting the obtained finished product to the required width to obtain a qualified product, and then packaging and warehousing.
According to the preparation method of the high-strength composite aluminum material for the partition board of the engineering machinery oil cooler, the core material and the brazing layer skin material are both prepared by adopting a continuous casting and rolling method;
the partition plate of the oil cooler of the engineering machinery is made of high-strength composite aluminum materials by a cold rolling composite method, and the cold rolling composite pass working rate is 55 +/-5% (namely the proper working rate);
according to the preparation method of the high-strength composite aluminum material for the partition board of the oil cooler of the engineering machinery, after cold rolling and compounding, diffusion annealing treatment is needed, so that deeper combination of the core material and the skin material is realized;
compared with the prior art, the invention has the advantages and beneficial effects that:
the high-strength composite aluminum material for the partition board of the oil cooler of the engineering machinery, which is obtained by the manufacturing method, is applied to the field of brazing engineering machinery in batches, and the brazing mode ensures that the oil cooler has good welding quality, neat appearance, high dimensional accuracy after welding and the like, and the component proportion of the core material ensures that the oil cooler has high strength and high anti-explosion pressure after welding.
The invention adopts the continuous casting and rolling method to prepare the core material and the brazing layer skin material, the thickness of the core material and the brazing layer skin material cast-rolled plate is about 7.2mm, the thickness is greatly reduced compared with the thickness of an ingot (generally 400mm), the production period is shortened, the production efficiency is improved, and the production cost is reduced. The cold rolling compounding integrates the surface treatment, the matching of the core material and the brazing layer skin material and the cold rolling compounding, and can be completed in one process, thereby greatly improving the production efficiency. The thickness control precision of the core material and the brazing layer material in the preparation process is high, and the surface treatment of cold rolling compounding is realized in a mechanical automation mode, so that the surface treatment effect and the stability of the cladding rate are effectively ensured. The composite aluminum material prepared by the method has high post-welding strength and good corrosion resistance after high-temperature welding, and ensures that the partition board has excellent anti-explosion pressure performance after brazing, the post-welding yield strength reaches 60-70 MPa, and the elongation is more than 15%. The material can be used for common controlled atmosphere brazing, the composite material has high strength after welding and excellent anti-explosion performance, can meet the performance requirement of an oil cooler on a composite plate, and the manufacturing method has the advantages of controllable process, good repeatability, easy mastering and capability of meeting the industrial development requirement.
Detailed Description
In order to enhance the understanding of the present invention, the present invention will be described in further detail with reference to the following examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Example 1
The method for manufacturing the high-strength composite aluminum material for the partition plate of the oil cooler of the engineering machinery comprises the following steps:
1. according to the alloy proportion: 0.3 wt% of Si, 0.45 wt% of Fe, 0.55 wt% of Cu, 0.9 wt% of Mn, 0.2 wt% of Mg0.2 wt%, 0.1 wt% of Zn, 0.05 wt% of Zr and 0-0.05 wt% of Ti, and preparing a core material cast-rolled plate by a continuous cast-rolling method after smelting; according to the alloy proportion: 9.8 wt% of Si, 0.5 wt% of Fe, 0.05 wt% of Cu, 0.05 wt% of Mn, 0.02 wt% of Zn and the balance of aluminum, and preparing a brazing layer cast-rolled plate by a continuous casting-rolling method after smelting;
2. preparing a core material: cold rolling the core material cast-rolled plate to 5.2mm, welding an outer ring, tightening a steel strip on the plate surface, annealing in a high-temperature annealing furnace, heating to a target heating temperature of 580 ℃ within 3 hours, keeping the temperature for 24-26 hours, and then discharging from the furnace for air cooling to obtain a core material blank;
3. preparing a brazing layer material: the brazing layer skin material cast-rolled coil is subjected to blank heat treatment, and the method comprises the following specific steps: welding the inner ring and the outer ring, tightening the steel belt on the plate surface, annealing in a high-temperature annealing furnace, heating to the target heating temperature of 530 ℃ within 3h, keeping the temperature for 20h, and then discharging from the furnace for air cooling; the brazing layer skin material cast-rolled coil is subjected to blank heat treatment, then is subjected to cold rolling to 0.45mm, and then is subjected to finishing and trimming by a slitting machine, wherein the trimming size is the width matched with the prepared core material; after finishing treatment, pulling and straightening the correction plate type, and cleaning surface residual oil; performing secondary heat treatment after straightening and cleaning, heating to the target heating temperature of 460 ℃ within 2h, preserving heat for 10h, transferring to the temperature of 400 ℃ and preserving heat for 3h, and then discharging from a furnace and air cooling to obtain a brazing layer skin material blank;
4. cold rolling and compounding: rolling and compounding the brazing layer skin material blank and the core material blank by a cold compounding rolling mill to obtain a 2.2mm cold-rolled composite plate;
5. and (3) diffusion annealing: tightening a steel strip on the surface of the cold-rolled composite plate, performing diffusion annealing in an annealing furnace, heating to a target heating temperature of 460 ℃ within 3 hours, keeping the temperature for 8 hours, and rotating to a temperature of 400 ℃ and keeping the temperature for 2 hours;
6. after the composite board is diffused, rolling the composite board by a roughing mill for 1.2mm, and then performing finishing and trimming by a slitting machine; then cold rolling to 0.68mm, sticking a high-temperature adhesive tape on the surface of the aluminum coil to fix the surface, and then placing the aluminum coil in an annealing furnace for annealing treatment before forming a finished product, wherein the specific process is as follows: heating to 450 ℃ for 4h, preserving heat for 6h, and transferring to 340 ℃ for preserving heat for 3 h; and (4) annealing the finished product before, finish rolling to 0.5mm, and slitting to reach the required width.
Taking a finished product sample, and detecting the mechanical properties of the finished product sample as shown in the following table 1:
TABLE 1 mechanical Properties of the finished product obtained in example 1
The coating rates of the resulting products are shown in table 2 below:
table 2 coating rate of the product obtained in example 1
| Position of the sample | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Measured as the coating rate% | 10.3 | 9.6 | 9.7 | 10.1 | 9.5 | 10.2 | 9.7 | 9.3 |
Remarking: the target cladding rate is 10 +/-2%, the positions of the sampled sheets are equidistant sampling of the transverse plate surface of the product, and the data show that the deviation of the cladding rate of the cold rolling compounding is within 1.0 and relatively stable.
Taking a finished product sample, firstly carrying out a simulated brazing test (process: 600 ℃/10min), then carrying out a tensile test according to the sample preparation requirement, and detecting the post-welding mechanical property of the finished material, wherein the detection results are as follows in table 3:
table 3 post weld mechanical properties simulated for the finished product made in example 1
The tensile strength of the aluminum alloy composite strip after simulated brazing is larger than 130MPa, the yield strength after brazing is 60-70 MPa, and the support strength after high-temperature brazing is good, so that the requirement of the partition plate material of the oil cooler of the engineering machinery can be met.
Comparative example 1
1. According to the alloy proportion: 0.25 wt% of Si, 0.55 wt% of Fe, 0.05 wt% of Cu, 1.1 wt% of Mn, 0.005wt% of Mg0.05 wt%, 0.05 wt% of Zn, 0.005 wt% of Zr and 0.05-0.1 wt% of Ti, and preparing a core material cast-rolled plate by a continuous cast-rolling method after smelting; according to the alloy proportion: 9.8 wt% of Si, 0.5 wt% of Fe, 0.05 wt% of Cu, 0.05 wt% of Mn, 0.02wt% of Zns and the balance of aluminum, and preparing a brazing layer skin material cast-rolled plate by a continuous casting-rolling method after smelting;
2. preparing a core material: cold rolling the core material cast-rolled plate to 5.2mm, welding an outer ring, tightening a steel strip on the plate surface, annealing in a high-temperature annealing furnace, heating to a target heating temperature of 580 ℃ within 3 hours, keeping the temperature for 24-26 hours, and then discharging from the furnace for air cooling to obtain a core material blank;
3. preparing a brazing layer material: the brazing layer skin material cast-rolled coil is subjected to blank heat treatment, and the method comprises the following specific steps: welding the inner ring and the outer ring, tightening the steel belt on the plate surface, annealing in a high-temperature annealing furnace, heating to the target heating temperature of 530 ℃ within 3h, keeping the temperature for 20h, and then discharging from the furnace for air cooling; carrying out heat treatment on the brazing layer cast-rolled coil through a blank, then carrying out cold rolling to 0.45mm, and then carrying out finishing and trimming by a slitting machine, wherein the trimming size is the width matched with the width of the prepared core material; after finishing treatment, pulling and straightening the correction plate type, and cleaning surface residual oil; performing secondary heat treatment after straightening and cleaning, heating to the target heating temperature of 460 ℃ within 2h, preserving heat for 10h, transferring to the temperature of 400 ℃ and preserving heat for 3h, and then discharging from a furnace and air cooling to obtain a brazing layer skin material blank;
4. cold rolling and compounding: rolling and compounding the brazing layer skin material blank and the core material blank by a cold compounding rolling mill to obtain a 2.2mm cold-rolled composite plate;
5. and (3) diffusion annealing: tightening a steel strip on the surface of the cold-rolled composite plate, performing diffusion annealing in an annealing furnace, heating to a target heating temperature of 460 ℃ within 3 hours, keeping the temperature for 8 hours, and rotating to a temperature of 400 ℃ and keeping the temperature for 2 hours;
6. after the composite board is diffused, rolling the composite board by a roughing mill for 1.2mm, and then performing finishing and trimming by a slitting machine; then cold rolling to 0.68mm, sticking a high-temperature adhesive tape on the surface of the aluminum coil to fix the surface, and then placing the aluminum coil in an annealing furnace for annealing treatment before forming a finished product, wherein the specific process is as follows: heating to 450 ℃ for 4h, preserving heat for 6h, and transferring to 340 ℃ for preserving heat for 3 h; and (4) annealing the finished product before, finish rolling to 0.5mm, and slitting to reach the required width.
Taking a finished product sample, and detecting the mechanical properties as the following table 4:
TABLE 4 mechanical Properties of the finished product obtained in comparative example 1
The coating rates of the resulting products are given in table 5 below:
TABLE 5 coating rate of the product obtained in comparative example 1
| Position of the sample | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Measured as the coating rate% | 10.1 | 9.5 | 9.6 | 10.2 | 9.8 | 10.3 | 9.2 | 9.6 |
Remarking: the target cladding rate is 10 +/-2%, the positions of the sampled sheets are equidistant sampling of the transverse plate surface of the product, and the data show that the deviation of the cladding rate of the cold rolling compounding is within 1.0 and relatively stable.
Taking a finished product sample, firstly carrying out a simulated brazing test (process: 600 ℃/10min), then carrying out a tensile test according to the sample preparation requirement, and detecting the post-welding mechanical property of the finished material, wherein the detection results are as follows:
TABLE 6 mechanical properties after simulated welding of the finished product prepared in comparative example 1
The tensile strength of the aluminum alloy composite strip after simulated brazing is only 100-110 MPa, the yield strength after brazing is only 30-40 MPa, and the support strength deviation after high-temperature brazing.
The above is one of the preferred embodiments of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The high-strength composite aluminum material for the partition plate of the oil cooler of the engineering machinery, which is produced by a cold rolling composite method, is characterized in that: the high-strength composite aluminum material for the partition board of the oil cooler of the engineering machinery comprises a core material and two layers of brazing clad materials, wherein the two layers of brazing clad materials are respectively compounded on the upper surface and the lower surface of the core material, the thickness of each layer of brazing clad material is 5-10% of the total thickness of the aluminum material, and the core material comprises the following components in percentage by weight: fe is less than or equal to 0.5 percent, Si: less than or equal to 0.3 percent, Cu: 0.50-0.70%, Mn: 0.65-1.0%, Mg: 0.1-0.3%, Zn: less than or equal to 0.1 percent, Zr: less than or equal to 0.05 percent, Ti: less than or equal to 0.1 percent, less than or equal to 0.05 percent of single content of other elements, less than or equal to 0.15 percent of total content of other elements and the balance of aluminum; the brazing layer skin material is aluminum-silicon alloy, and the brazing layer skin material comprises the following components in percentage by weight: fe: less than or equal to 0.80%, Si: 8.0 to 11.0%, Cu: less than or equal to 0.20 percent, Mn: less than or equal to 0.05 percent, Zn: less than or equal to 0.1 percent, Ti: less than or equal to 0.05 percent, less than or equal to 0.05 percent of single other elements, less than or equal to 0.15 percent of the total amount of the other elements and the balance of aluminum.
2. The high-strength composite aluminum material for a partition board of an oil cooler of construction machinery produced by the cold rolling composition method as set forth in claim 1, wherein the core material and the brazing layer skin material alloy are continuously cast and rolled to obtain a core material blank and a brazing layer skin material blank, respectively, and the core material and the brazing layer are combined by the cold rolling composition method to form a brazing layer-core material-brazing layer structure, and the high-strength composite aluminum material for a partition board of an oil cooler of construction machinery is obtained after finish rolling.
3. A method for manufacturing a high-strength composite aluminum material for an oil cooler partition board of construction machinery as claimed in claim 1 or 2, comprising the steps of:
respectively smelting a brazing layer skin material and a core material according to the chemical components in the claim 1 to obtain a smelted brazing layer skin material aluminum alloy and a smelted core material aluminum alloy;
continuously casting and rolling the smelted brazing layer skin material aluminum alloy and core material aluminum alloy into a brazing layer skin material cast-rolled plate and a core material cast-rolled plate respectively;
preparing a core material cast-rolled plate into a core material blank;
preparing a brazing layer skin material casting and rolling plate into a brazing layer skin material blank;
rolling the core material blank and the brazing layer skin material blank by a cold rolling composite rolling mill, and carrying out processing, rolling and compounding to obtain a 1.6-3.2mm cold rolling composite plate;
tightening a steel strip on the surface of an aluminum coil plate of the cold-rolled composite plate, performing diffusion annealing in an annealing furnace, heating to the target heating temperature of 420-;
cold rolling the cold-rolled composite plate after diffusion annealing into a composite plate with the thickness of 0.45-1.2 mm, and performing finishing and trimming by a slitting machine to obtain an aluminum coil after finishing and trimming;
carrying out pre-finished product annealing treatment on the finished and trimmed aluminum coil, and fixing the surface of the aluminum coil by using a high-temperature adhesive tape during annealing;
and (5) performing finish rolling on the aluminum alloy composite strip obtained after the pre-finished product annealing treatment, and rolling into a finished product.
4. The method of claim 3, wherein the finished aluminum alloy composite strip has a thickness of 0.3 to 0.5 mm.
5. The method of manufacturing as claimed in claim 3, wherein the step of manufacturing the core cast-rolled plate into the core material blank comprises: cold rolling the core material cast-rolled plate prepared by the continuous casting-rolling method to obtain a plate with the thickness of 3.8-5.2mm, welding an outer ring, tightening a steel belt on the plate surface, annealing in an annealing furnace, discharging from the furnace and air cooling to obtain a core material blank; the annealing conditions were as follows: heating to the target heating temperature of 580 ℃ within 3h, preserving the heat for 24-26h, and then discharging and air cooling.
6. The production method according to claim 3, wherein the step of producing the brazing sheet cast-rolled sheet as a brazing sheet blank comprises: performing blank heat treatment on a brazing layer skin material cast-rolled plate prepared by a continuous casting-rolling method, performing first cold rolling until the thickness of the brazing layer skin material cast-rolled plate is 0.4-0.75mm, and then performing finishing trimming by a slitting mill, wherein the width of the trimming of the brazing layer skin material is the width matched with the prepared core material; after finishing treatment, pulling and straightening the correction plate type, and cleaning surface residual oil; and performing secondary heat treatment after the withdrawal, straightening and cleaning.
7. The method of claim 6, wherein the billet is heat treated by the steps of: welding the inner ring and the outer ring, tightening the steel belt on the surface of the steel belt, and annealing in an annealing furnace, wherein the annealing conditions are as follows: heating to the target heating temperature of 500-540 ℃ within 2-4h, preserving the heat for 10-18h, then transferring to the temperature of 480-520 ℃ and preserving the heat for 2-6h, and taking out from the furnace and air cooling.
8. The method of claim 6, wherein the second heat treatment comprises the following steps: and (3) tightening the steel strip on the plate surface, annealing in an annealing furnace, heating to the target heating temperature of 430-470 ℃ within 2-4h, preserving heat for 8-12h, rotating to the temperature of 360-410 ℃ and preserving heat for 2-5h, and then discharging from the furnace and air cooling to obtain the brazing layer skin material blank.
9. The method of claim 3, wherein the pre-finish annealing step comprises: heating to 240-plus-one temperature for 2-5h at 280 ℃, transferring to 350-plus-one temperature for 8-12h at 450 ℃, and then transferring to 320-plus-one temperature for 2h at 360 ℃.
10. The method of claim 3, wherein the cold rolling reduction is 55 ± 5%.
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