CN100574972C - The manufacture method of composite aluminum foil for car heat exchanger - Google Patents
The manufacture method of composite aluminum foil for car heat exchanger Download PDFInfo
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- CN100574972C CN100574972C CN200710191851A CN200710191851A CN100574972C CN 100574972 C CN100574972 C CN 100574972C CN 200710191851 A CN200710191851 A CN 200710191851A CN 200710191851 A CN200710191851 A CN 200710191851A CN 100574972 C CN100574972 C CN 100574972C
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Abstract
The invention discloses a kind of process technology of metal material, especially a kind of manufacture method of producing aluminium alloy composite insulating foil, this manufacture method is by fusing, refining, slagging-off, stir, earlier aluminium liquid is poured into ingot blank, again ingot blank is rolled into the aluminium alloy plate, then will go up, the upper and lower surface that covers the sandwich layer cast panel after following clad aluminium alloy plate cleans is carried out seam, subsequently the alloy sheets after the seam is rolled into blank under certain condition, blank with hot rolling on cold-rolling mill rolls into foil, at last foil is placed on and carries out intermediate annealing in the annealing furnace, take out after finish rolling, the finishing straightening, behind the accurate-shearing, promptly make car heat exchanger composite insulating foil of the present invention.The invention has the advantages that the microscopic structure of having improved composite insulating foil and the distributional pattern and the structure of the second phase particle, thereby improved the inherent structure property of composite insulating foil, and seam, hot rolling, cold rolling and intermediate annealing process by optimizing make composition even tissue, coating thickness consistent size.
Description
Technical field
The present invention relates to a kind of process technology of metal material, especially a kind of manufacture method of producing aluminium alloy composite insulating foil.
Background technology
In light weight, corrosion-resistant, advantages such as braze ability is good, dependable performance that clad aluminum foil has, it has been widely used in the car heat exchanger, as automobile water tank radiator, automotive air-conditioning condenser, evaporimeter etc.The eighties in 20th century, because the development of Vacuum Soldering Technology, automobile produced in USA has 50% vacuum brazing aluminium foil heat exchanger has been installed, and to the nineties, industrially developed country's car heat exchanger composite brazing aluminium foil utilization rate reaches more than 90%.In recent years, the domestic automobile development is very fast, and automobile annual production has at present reached 3,000,000, and the automotive society recoverable amount is above 2,000 ten thousand.But the heat exchanger material in some domestic automobile is traditional Copper Foil mostly at present, not only increased the deadweight of automobile, and heat dispersion is unsatisfactory.Though also the heat exchanger in some automobile has adopted clad aluminum foil, the overwhelming majority is import, and cost is higher.Mechanical property owing to matrix alloy and high silicon clad alloy differs greatly again, so its complex manufacturing, the production difficulty is big, and making only has minority producer to be confined to the supply of small lot, do not form large-scale production yet, far can not satisfy the requirement of Domestic Automotive Industry development.And clad aluminum foil instability, the clad aluminum foil of existing explained hereafter are organized bad, tensile strength, combined strength bination, the anti-ability of subsiding can not get technology and guarantee, the sagging resistance of material is bad, and heat-radiation belt is yielding when soldering, makes that easily the heat exchanger bulk strength is not enough.
Along with the development of Domestic Automotive Industry, automobile also increases severely with day to the clad aluminum foil demand with the raising of heat exchanger calorize rate.The mode of the sort of dependence import has not simply satisfied the development need of Domestic Automotive Industry.Based on this, the construction high-tech, specialized composite brazing aluminium foil production line, satisfy the automobile aluminium interchanger market demand, alleviate the imbalance between supply and demand of domestic anxiety, reduce China's automobile production cost, enhancing our international competitiveness has great importance for Chinese economic development.
Summary of the invention
1, goal of the invention: the objective of the invention is deficiency at the manufacturing process of existing clad aluminum foil, propose a kind of manufacture method of composite aluminum foil for car heat exchanger, this method has solved that organizing of existing composite insulating foil is bad, tensile strength is low, combined strength bination is low, the anti-bad problem of ability of subsiding.
2, technical scheme: for achieving the above object, the manufacture method of composite aluminum foil for car heat exchanger of the present invention is characterized in that this method may further comprise the steps:
1) will be according to the 3 series alloys trade mark, as 3003 or 3003+Zn trade mark preparation as the raw material of clad aluminum foil sandwich layer with according to the 4 series alloys trades mark, raw material as the trades mark such as 4004,4343 preparation as the upper and lower clad of composite insulating foil, join respectively in the smelting furnace, all melting under 740-750 ℃ the temperature, the aluminium liquid that forms put into respectively after the refining, slagging-off, stirring and leave standstill stove;
2) under 695-705 ℃ of temperature, sandwich layer aluminium liquid and upper and lower clad aluminium liquid are poured into ingot casting respectively; Need to add rare earth aluminium titanium carbon (AlTiCRE) in casting process, need after the adding to guarantee that the content of Ti is 0.35-0.45%, the content of rare-earth elements of lanthanum (La) is 0.015-0.035%.Purpose is a crystal grain thinning, reduces or eliminates column crystal, and the removal of impurities of degassing purifies metal, reduces the ingot structure defective;
3) ingot casting that will be used for making upper and lower clad is placed on heating furnace, and heating-up temperature is 460-470 ℃, is incubated after 1 hour, ingot casting is rolled into the aluminium alloy plate of 48～52mm;
4) upper and lower surface that covers the sandwich layer ingot casting after the upper and lower clad aluminium alloy plate cleaning is carried out seam;
5) with the alloy sheets after the seam under 490-510 ℃ condition, be incubated after 3 hours, the beginning hot rolling, roll into the sheet material that thickness is 5.0-5.8mm;
6) sheet material that 5.0-5.8mm is thick rolls into the thick foil of 0.09-0.18mm on cold-rolling mill;
7) foil that 0.09-0.18mm is thick is placed on and carries out intermediate annealing in the annealing furnace, and annealing temperature is 300-350 ℃, and foil keeps taking out after 2-5 hour to temperature, is cooled to normal temperature;
8) foil rolling that 0.09-0.18mm is thick becomes 0.07-0.14mm on cold-rolling mill, behind finishing straightening, accurate-shearing, and the car heat exchanger composite insulating foil of promptly making.
In order to guarantee the quality of melt, in the fusion process of step 1), use injection refining equipment, by crossing gas carrier N
2Si is sprayed in the melt with crystallization silica flour form, and silicon particle size is not more than 1.8mm, and purity is not less than 99%.Silicon can not only make composite insulating foil intensity even after evenly distributing in melt, and when soldering good fluidity, increase clearance filling capability, and make the welding zone even tissue fine and closely woven, thereby improved the anti-ability of subsiding.Both analysis Na, Li, Ca content all are controlled at 4.9 * 10 with it
-5Below the %, defectives such as embrittlement, cold shut appear when preventing to pour into a mould.And Mn adds in the melt with the additive form, and Zn adds with the zinc ingot metal form, to guarantee uniform component.
In order to guarantee casting quality and efficient, in step 2) casting process in, casting speed is 50-60mm/min, cooling water pressure is 0.1-0.3MPa, flow is 210-250m
3/ h.
For reduce ingot casting end to end, the nonmetal tissue, casting flaw etc. on surface, in described step 2) and step 3) between, will be used to make the ingot casting of clad, time clad and be used to make the sandwich layer ingot casting and saw respectively end to end and mill face.The single face milling amount is 10-15mm.
Dirty in order to prevent that the ingot casting surface from producing, reduce oxidation.As behind the sandwich layer ingot mill surface, thickness is 350～360mm, and limit portion burr polishes with frustrating cutter, covers the surface with plastic sheeting then.
In order to guarantee the no greasy dirt in seam surface, oxide-film and other bur.Step 4) center core layer and clad seam face are cleaned, should cooperate gasoline to clean with mop or gauze earlier, clean seam face with cleaning fluid again, scrape clean surface with the rubber skin then, dry with clean silk again, and dry up with blower fan.
For the combined strength bination between clad about guaranteeing and the sandwich layer, and can not produce the changing of the relative positions by hot rolling.Step 4) center core layer and clad are carried out in the seam process, upper and lower clad aluminium alloy plate should be covered on the upper and lower surface of sandwich layer ingot casting, and compress sandwich layer ingot casting and coating layer material with big slab ingot, make contact-making surface closely smooth, adopt the aluminium wire bonding machine that the contact-making surface edge is carried out seam then.
Between clad about making and sandwich layer, both, middle air was discharged smoothly in conjunction with firmly.Reduce the bare area of core ingot, surface oxidation degree when reducing follow-up heating in the process of step 4), to whole full welds on the whole length of clad up and down and sandwich layer faying face seam, welds several points and gets final product on width.
For quality and the efficient that guarantees course of hot rolling, improve the adhesion between clad and sandwich layer.In the course of hot rolling of step 5), alloy sheets sheet material end face welding position after the seam is introduced into roll, the position, intermediate portion moves to static pressure in the middle of the milling train, depresses by technological requirement, rolling 4 passages in two ends to the left and right, the 1-4 passage is dried rolling, drafts≤4mm.Passage is rolling by normal milling method later on, and emulsion concentration is adjusted into 4.0-4.3%, and finishing temperature is controlled at 310-350 ℃.
3, beneficial effect: the present invention compared with prior art, its remarkable advantage:
1) the present invention has added rare earth aluminium titanium carbon (AlTiCRE) when the cast ingot casting, has improved the microscopic structure of composite insulating foil and the distributional pattern and the structure of the second phase particle, thereby has improved the inherent structure property of composite insulating foil.
2) the present invention passes through the position of the cold rolling intermediate annealing of regulation, thereby determines the best cold working rate (20-24%) of intermediate annealing to finished product, can guarantee that the clad aluminum foil finished product has the perfect recrystallization crystal grain of bigger elongation when soldering.Soldering strength and the anti-ability of subsiding are improved.Because when soldering, the Si in the cover layer diffuses to form diffusion zone along crystal boundary to core, α (Al)+Si eutectic occurs; The increase of Si reduces the solubility of Mn, produces α (Al)+MnAl6 eutectic in diffusion zone, and this has just reduced the intensity of core material.Element is diffused into sandwich layer along crystal boundary in the solder and the recrystal grain of bigger elongation can stop.The degree of the creep that crystal boundary produced when the recrystal grain of simultaneously bigger elongation made soldering because of crystal boundary is few is low.The final performance indications of the present invention can reach: tensile strength is 160-190MPa, sagging resistance≤10mm.(prior art is that tensile strength is 150-170MPa, sagging resistance≤15mm).
3) the present invention is by melting, casting process control alloying component, tissue, pass through seam, hot rolling, the cold rolling and intermediate annealing process of optimization then, make composition even tissue, coating thickness consistent size, clad ratio is 9-12%, guarantee that composite surface in conjunction with firmly, can obviously improve the tensile strength and the anti-ability of subsiding of composite insulating foil.Clad ratio just is meant that the single face coating thickness accounts for the percentage of gross thickness.Clad ratio is too small, and solder can be under-supply during soldering, causes rosin joint or dry joint, influences the conductivity of heat and the robustness of heat exchanger.Clad ratio is excessive, and core layer thickness reduces relatively, is difficult to support the weight of heat exchanger when soldering, the phenomenon of can caving in.
The specific embodiment
Embodiment 1: the manufacture method of composite aluminum foil for car heat exchanger is:
1) will according to 3003 or 3003+Zn trade mark preparation as the raw material of clad aluminum foil sandwich layer with according to the raw material as the upper and lower clad of clad aluminum foil of trade mark preparations such as 4004 or 4343, join respectively in the smelting furnace, melting under 740 ℃ the temperature, the aluminium liquid that forms put into after the refining, slagging-off, stirring and leave standstill stove.In order to guarantee the quality of melt, in fusion process, use injection refining equipment, by crossing gas carrier N
2Si is sprayed in the aluminum melt with crystallization silica flour form, and silicon particle size is controlled at 1mm, and purity is 99%.Both analysis Li, Na, Ca content all are controlled at 4.9 * 10 with it
-5Below the %.And Mn adds in the melt with the additive form, and Zn adds with zinc ingot metal piece form, thereby guarantees uniform component.
2) in order to guarantee casting quality and efficient, temperature is controlled at 695 ℃, and with 50mm/min, cooling water pressure is 0.1MPa, and flow is 210m
3The casting speed of/h pours into hot rolling ingot with aluminium liquid.Need to add rare earth aluminium titanium carbon (AlTiCRE) in casting process, need after the adding to guarantee that the content of Ti is 0.35%, the content of rare-earth elements of lanthanum (La) is 0.015%.Purpose is a crystal grain thinning, reduces or eliminates column crystal, and the removal of impurities of degassing purifies metal, reduces the ingot structure defective.
3) will be used to make clad, down clad ingot casting and be used to make the sandwich layer ingot casting and saw respectively end to end and mill face, the single face milling amount is 10mm.As behind the sandwich layer ingot mill surface, thickness should be 350mm, and it is smooth to mill the rear surface, does not have sticking aluminium, no milling knurl, and limit portion burr polishes with frustrating cutter, covers the surface with plastic sheeting after milling the face end, prevents that dust from dropping in the surface;
The ingot casting that being used for after 4) will sawing end to end made upper and lower clad is placed on heating furnace, and heating-up temperature is 460 ℃, is incubated after 1 hour, ingot casting is rolled into the aluminium alloy plate of 48mm;
5) sandwich layer and clad seam face are cleaned, clean with No. 200 gasoline with mop or gauze earlier, clean seam face with cleaning fluid again, scrape clean surface with the rubber skin then, dry with clean silk again, and dry up with blower fan.
6) upper and lower clad aluminium alloy plate is covered on the upper and lower surface of sandwich layer ingot casting, and compress sandwich layer ingot casting and coating layer material, make contact-making surface closely smooth, adopt the aluminium wire bonding machine that the contact-making surface edge is carried out seam then with big slab ingot; Wherein in order to reduce the bare area of core ingot, surface oxidation degree when reducing follow-up heating to whole full welds on the whole length of clad up and down and sandwich layer faying face seam, gets final product at the enterprising spot welding of width.
7) with the alloy sheets after the seam in heating furnace, under 490 ℃ condition, be incubated after 3 hours, the beginning hot rolling, roll into the sheet material that thickness is 5.0mm;
For quality and the efficient that guarantees course of hot rolling, in the course of hot rolling of step 7), alloy sheets end face welding position after the seam is introduced into roll, the position, intermediate portion moves to the middle static pressure of milling train, depress by technological requirement, rolling 4 passages in two ends to the left and right, the 1-4 passage is dried rolling, drafts is 3mm.Passage is rolling by normal milling method later on, and emulsion concentration is adjusted into 4.0%, and finishing temperature is controlled at 310 ℃.
8) sheet material that 5.0mm is thick rolls into the thick foil of 0.09mm on cold-rolling mill;
9) foil that 0.09mm is thick is placed on and carries out intermediate annealing in the annealing furnace, and annealing temperature is 300 ℃, and foil keeps taking out after 2 hours to temperature, is cooled to normal temperature;
10) foil rolling that 0.09mm is thick becomes 0.07mm on cold-rolling mill, behind finishing straightening, accurate-shearing, promptly makes composite aluminum foil for car heat exchanger.
Embodiment 2:
1) will according to 3003 or 3003+Zn trade mark preparation as the raw material of clad aluminum foil sandwich layer with according to the raw material as the upper and lower clad of clad aluminum foil of trade mark preparations such as 4004 or 4343, join respectively in the smelting furnace, melting under 745 ℃ the temperature, the aluminium liquid that forms put into after the refining, slagging-off, stirring and leave standstill stove.In order to guarantee the quality of melt, in fusion process, use injection refining equipment, by crossing gas carrier N
2Si is sprayed in the aluminum melt with crystallization silica flour form, and silicon particle size is controlled at 1mm, and purity is 99.2%.Both analysis Li, Na, Ca content all are controlled at 4.9 * 10 with it
-5Below the %.And Mn adds in the melt with the additive form, and Zn adds with zinc ingot metal piece form, thereby guarantees uniform component.
2) in order to guarantee casting quality and efficient, temperature is controlled at 700 ℃, and with 50mm/min, cooling water pressure is 0.15MPa, and flow is 220m
3The casting speed of/h pours into hot rolling ingot with aluminium liquid.Need to add rare earth aluminium titanium carbon (AlTiCRE) in casting process, need after the adding to guarantee that the content of Ti is 0.35%, the content of rare-earth elements of lanthanum (La) is 0.020%.Purpose is a crystal grain thinning, reduces or eliminates column crystal, and the removal of impurities of degassing purifies metal, reduces the ingot structure defective.Casting speed pours into hot rolling ingot with aluminium liquid.
3) will be used to make clad, down clad ingot casting and be used to make the sandwich layer ingot casting and saw respectively end to end and mill face, the single face milling amount is 11mm.As behind the sandwich layer ingot mill surface, thickness should be 355mm, and it is smooth to mill the rear surface, does not have sticking aluminium, no milling knurl, and limit portion burr polishes with frustrating cutter, covers the surface with plastic sheeting after milling the face end, prevents that dust from dropping in the surface;
The ingot casting that being used for after 4) will sawing end to end made upper and lower clad is placed on heating furnace, and heating-up temperature is 465 ℃, is incubated after 1 hour, ingot casting is rolled into the aluminium alloy plate of 50mm;
5) sandwich layer and clad seam face are cleaned, clean with No. 200 gasoline with mop or gauze earlier, clean seam face with cleaning fluid again, scrape clean surface with the rubber skin then, dry with clean silk again, and dry up with blower fan.
6) upper and lower clad aluminium alloy plate is covered on the upper and lower surface of sandwich layer ingot casting, and compress sandwich layer ingot casting and coating layer material, make contact-making surface closely smooth, adopt the aluminium wire bonding machine that the contact-making surface edge is carried out seam then with big slab ingot; Wherein in order to reduce the bare area of core ingot, surface oxidation degree when reducing follow-up heating to whole full welds on the whole length of clad up and down and sandwich layer faying face seam, gets final product at the enterprising spot welding of width.
7) with the alloy sheets after the seam in heating furnace, under 495 ℃ condition, be incubated after 3 hours, the beginning hot rolling, roll into the sheet material that thickness is 5.2mm;
For quality and the efficient that guarantees course of hot rolling, in the course of hot rolling of step 7), alloy sheets end face welding position after the seam is introduced into roll, the position, intermediate portion moves to the middle static pressure of milling train, depress by technological requirement, rolling 4 passages in two ends to the left and right, the 1-4 passage is dried rolling, drafts is 3.5mm.Passage is rolling by normal milling method later on, and emulsion concentration is adjusted into 4.0%, and finishing temperature is controlled at 315 ℃.
8) sheet material that 5.2mm is thick rolls into the thick foil of 0.11mm on cold-rolling mill;
9) foil that 0.11mm is thick is placed on and carries out intermediate annealing in the annealing furnace, and annealing temperature is 315 ℃, and foil keeps taking out after 2 hours to temperature, is cooled to normal temperature;
10) foil rolling that 0.11mm is thick becomes 0.09mm on cold-rolling mill, behind finishing straightening, accurate-shearing, promptly makes composite aluminum foil for car heat exchanger.
Embodiment 3:
1) will according to 3003 or 3003+Zn trade mark preparation as the raw material of clad aluminum foil sandwich layer with according to the raw material as the upper and lower clad of clad aluminum foil of trade mark preparations such as 4004 or 4343, join respectively in the smelting furnace, melting under 745 ℃ the temperature, the aluminium liquid that forms put into after the refining, slagging-off, stirring and leave standstill stove.In order to guarantee the quality of melt, in fusion process, use injection refining equipment, by crossing gas carrier N
2Si is sprayed in the aluminum melt with crystallization silica flour form, and silicon particle size is controlled at 1mm, and purity is 99.5%.Both analysis Li, Na, Ca content all are controlled at 4.9 * 10 with it
-5Below the %.And Mn adds in the melt with the additive form, and Zn adds with zinc ingot metal piece form, thereby guarantees uniform component.
2) in order to guarantee casting quality and efficient, temperature is controlled at 700 ℃, and with 55mm/min, cooling water pressure is 0.2MPa, and flow is 230m
3The casting speed of/h pours into hot rolling ingot with aluminium liquid.Need to add rare earth aluminium titanium carbon (AlTiCRE) in casting process, need after the adding to guarantee that the content of Ti is 0.4%, the content of rare-earth elements of lanthanum (La) is 0.025%.Purpose is a crystal grain thinning, reduces or eliminates column crystal, and the removal of impurities of degassing purifies metal, reduces the ingot structure defective.Casting speed pours into hot rolling ingot with aluminium liquid.
3) will be used to make clad, down clad ingot casting and be used to make the sandwich layer ingot casting and saw respectively end to end and mill face, the single face milling amount is 12mm.As behind the sandwich layer ingot mill surface, thickness should be 355mm, and it is smooth to mill the rear surface, does not have sticking aluminium, no milling knurl, and limit portion burr polishes with frustrating cutter, covers the surface with plastic sheeting after milling the face end, prevents that dust from dropping in the surface;
The ingot casting that being used for after 4) will sawing end to end made upper and lower clad is placed on heating furnace, and heating-up temperature is 465 ℃, is incubated after 1 hour, ingot casting is rolled into the aluminium alloy plate of 50mm;
5) sandwich layer and clad seam face are cleaned, clean with No. 200 gasoline with mop or gauze earlier, clean seam face with cleaning fluid again, scrape clean surface with the rubber skin then, dry with clean silk again, and dry up with blower fan.
6) upper and lower clad aluminium alloy plate is covered on the upper and lower surface of sandwich layer ingot casting, and compress sandwich layer ingot casting and coating layer material, make contact-making surface closely smooth, adopt the aluminium wire bonding machine that the contact-making surface edge is carried out seam then with big slab ingot; Wherein in order to reduce the bare area of core ingot, surface oxidation degree when reducing follow-up heating to whole full welds on the whole length of clad up and down and sandwich layer faying face seam, gets final product at the enterprising spot welding of width.
7) with the alloy sheets after the seam in heating furnace, under 500 ℃ condition, be incubated after 3 hours, the beginning hot rolling, roll into the sheet material that thickness is 5.4mm;
For quality and the efficient that guarantees course of hot rolling, in the course of hot rolling of step 7), alloy sheets end face welding position after the seam is introduced into roll, the position, intermediate portion moves to the middle static pressure of milling train, depress by technological requirement, rolling 4 passages in two ends to the left and right, the 1-4 passage is dried rolling, drafts is 2.5mm.Passage is rolling by normal milling method later on, and emulsion concentration is adjusted into 4.1%, and finishing temperature is controlled at 320 ℃.
8) sheet material that 5.4mm is thick rolls into the thick foil of 0.13mm on cold-rolling mill;
9) foil that 0.13mm is thick is placed on and carries out intermediate annealing in the annealing furnace, and annealing temperature is 320 ℃, and foil keeps taking out after 3 hours to temperature, is cooled to normal temperature;
10) foil rolling that 0.13mm is thick becomes 0.10mm on cold-rolling mill, behind finishing straightening, accurate-shearing, promptly makes composite aluminum foil for car heat exchanger.
Embodiment 4:
1) will according to 3003 or 3003+Zn trade mark preparation as the raw material of clad aluminum foil sandwich layer with according to the raw material as the upper and lower clad of clad aluminum foil of trade mark preparations such as 4004 or 4343, join respectively in the smelting furnace, melting under 745 ℃ the temperature, the aluminium liquid that forms put into after the refining, slagging-off, stirring and leave standstill stove.In order to guarantee the quality of melt, in fusion process, use injection refining equipment, by crossing gas carrier N
2Si is sprayed in the aluminum melt with crystallization silica flour form, and silicon particle size is controlled at 1mm, and purity is 99.6%.Both analysis Li, Na, Ca content all are controlled at 4.9 * 10 with it
-5Below the %.And Mn adds in the melt with the additive form, and Zn adds with zinc ingot metal piece form, thereby guarantees uniform component.
2) in order to guarantee casting quality and efficient, temperature is controlled at 700 ℃, and with 55mm/min, cooling water pressure is 0.2MPa, and flow is 240m
3The casting speed of/h pours into hot rolling ingot with aluminium liquid.Need to add rare earth aluminium titanium carbon (AlTiCRE) in casting process, need after the adding to guarantee that the content of Ti is 0.4%, the content of rare-earth elements of lanthanum (La) is 0.025%.Purpose is a crystal grain thinning, reduces or eliminates column crystal, and the removal of impurities of degassing purifies metal, reduces the ingot structure defective.Casting speed pours into hot rolling ingot with aluminium liquid.
3) will be used to make clad, down clad ingot casting and be used to make the sandwich layer ingot casting and saw respectively end to end and mill face, the single face milling amount is 13mm.As behind the sandwich layer ingot mill surface, thickness should be 355mm, and it is smooth to mill the rear surface, does not have sticking aluminium, no milling knurl, and limit portion burr polishes with frustrating cutter, covers the surface with plastic sheeting after milling the face end, prevents that dust from dropping in the surface;
The ingot casting that being used for after 4) will sawing end to end made upper and lower clad is placed on heating furnace, and heating-up temperature is 465 ℃, is incubated after 1 hour, ingot casting is rolled into the aluminium alloy plate of 50mm;
5) sandwich layer and clad seam face are cleaned, clean with No. 200 gasoline with mop or gauze earlier, clean seam face with cleaning fluid again, scrape clean surface with the rubber skin then, dry with clean silk again, and dry up with blower fan.
6) upper and lower clad aluminium alloy plate is covered on the upper and lower surface of sandwich layer ingot casting, and compress sandwich layer ingot casting and coating layer material, make contact-making surface closely smooth, adopt the aluminium wire bonding machine that the contact-making surface edge is carried out seam then with big slab ingot; Wherein in order to reduce the bare area of core ingot, surface oxidation degree when reducing follow-up heating to whole full welds on the whole length of clad up and down and sandwich layer faying face seam, gets final product at the enterprising spot welding of width.
7) with the alloy sheets after the seam in heating furnace, under 510 ℃ condition, be incubated after 3 hours, the beginning hot rolling, roll into the sheet material that thickness is 5.6mm;
For quality and the efficient that guarantees course of hot rolling, in the course of hot rolling of step 7), alloy sheets end face welding position after the seam is introduced into roll, the position, intermediate portion moves to the middle static pressure of milling train, depress by technological requirement, rolling 4 passages in two ends to the left and right, the 1-4 passage is dried rolling, drafts is 3.5mm.Passage is rolling by normal milling method later on, and emulsion concentration is adjusted into 4.2%, and finishing temperature is controlled at 330 ℃.
8) sheet material that 5.6mm is thick rolls into the thick foil of 0.16mm on cold-rolling mill;
9) foil that 0.16mm is thick is placed on and carries out intermediate annealing in the annealing furnace, and annealing temperature is 330 ℃, and foil keeps taking out after 4 hours to temperature, is cooled to normal temperature;
10) foil rolling that 0.16mm is thick becomes 0.11mm on cold-rolling mill, behind finishing straightening, accurate-shearing, promptly makes composite aluminum foil for car heat exchanger.
Embodiment 5:
1) will according to 3003 or 3003+Zn trade mark preparation as the raw material of clad aluminum foil sandwich layer with according to the raw material as the upper and lower clad of clad aluminum foil of trade mark preparations such as 4004 or 4343, join respectively in the smelting furnace, melting under 750 ℃ the temperature, the aluminium liquid that forms put into after the refining, slagging-off, stirring and leave standstill stove.In order to guarantee the quality of melt, in fusion process, use injection refining equipment, by crossing gas carrier N
2Si is sprayed in the aluminum melt with crystallization silica flour form, and silicon particle size is controlled at 1.8mm, and purity is 99.8%.Both analysis Li, Na, Ca content all are controlled at 4.9 * 10 with it
-5Below the %.And Mn adds in the melt with the additive form, and Zn adds with zinc ingot metal piece form, thereby guarantees uniform component.
2) in order to guarantee casting quality and efficient, temperature is controlled at 705 ℃, and with 60mm/min, cooling water pressure is 0.3MPa, and flow is 250m
3The casting speed of/h pours into hot rolling ingot with aluminium liquid.Need to add rare earth aluminium titanium carbon (AlTiCRE) in casting process, need after the adding to guarantee that the content of Ti is 0.45%, the content of rare-earth elements of lanthanum (La) is 0.035%.Purpose is a crystal grain thinning, reduces or eliminates column crystal, and the removal of impurities of degassing purifies metal, reduces the ingot structure defective.Casting speed pours into hot rolling ingot with aluminium liquid.
3) will be used to make clad, down clad ingot casting and be used to make the sandwich layer ingot casting and saw respectively end to end and mill face, the single face milling amount is 14mm.As behind the sandwich layer ingot mill surface, thickness should be 360mm, and it is smooth to mill the rear surface, does not have sticking aluminium, no milling knurl, and limit portion burr polishes with frustrating cutter, covers the surface with plastic sheeting after milling the face end, prevents that dust from dropping in the surface;
The ingot casting that being used for after 4) will sawing end to end made upper and lower clad is placed on heating furnace, and heating-up temperature is 470 ℃, is incubated after 1 hour, ingot casting is rolled into the aluminium alloy plate of 52mm;
5) sandwich layer and clad seam face are cleaned, clean with No. 200 gasoline with mop or gauze earlier, clean seam face with cleaning fluid again, scrape clean surface with the rubber skin then, dry with clean silk again, and dry up with blower fan.
6) upper and lower clad aluminium alloy plate is covered on the upper and lower surface of sandwich layer ingot casting, and compress sandwich layer ingot casting and coating layer material, make contact-making surface closely smooth, adopt the aluminium wire bonding machine that the contact-making surface edge is carried out seam then with big slab ingot; Wherein in order to reduce the bare area of core ingot, surface oxidation degree when reducing follow-up heating to whole full welds on the whole length of clad up and down and sandwich layer faying face seam, gets final product at the enterprising spot welding of width.
7) with the alloy sheets after the seam in heating furnace, under 510 ℃ condition, be incubated after 3 hours, the beginning hot rolling, roll into the sheet material that thickness is 5.8mm;
For quality and the efficient that guarantees course of hot rolling, in the course of hot rolling of step 7), alloy sheets end face welding position after the seam is introduced into roll, the position, intermediate portion moves to the middle static pressure of milling train, depress by technological requirement, rolling 4 passages in two ends to the left and right, the 1-4 passage is dried rolling, drafts is 4mm.Passage is rolling by normal milling method later on, and emulsion concentration is adjusted into 4.3%, and finishing temperature is controlled at 340 ℃.
8) sheet material that 5.8mm is thick rolls into the thick foil of 0.15mm on cold-rolling mill;
9) foil that 0.15mm is thick is placed on and carries out intermediate annealing in the annealing furnace, and annealing temperature is 340 ℃, and foil keeps taking out after 5 hours to temperature, is cooled to normal temperature;
10) foil rolling that 0.15mm is thick becomes 0.12mm on cold-rolling mill, behind finishing straightening, accurate-shearing, promptly makes composite aluminum foil for car heat exchanger.
Embodiment 6:
1) will according to 3003 or 3003+Zn trade mark preparation as the raw material of clad aluminum foil sandwich layer with according to the raw material as the upper and lower clad of clad aluminum foil of trade mark preparations such as 4004 or 4343, join respectively in the smelting furnace, melting under 750 ℃ the temperature, the aluminium liquid that forms put into after the refining, slagging-off, stirring and leave standstill stove.In order to guarantee the quality of melt, in fusion process, use injection refining equipment, by crossing gas carrier N
2Si is sprayed in the aluminum melt with crystallization silica flour form, and silicon particle size is controlled at 1.8mm, and purity is 99%.Both analysis Li, Na, Ca content all are controlled at 4.9 * 10 with it
-5Below the %.And Mn adds in the melt with the additive form, and Zn adds with zinc ingot metal piece form, thereby guarantees uniform component.
2) in order to guarantee casting quality and efficient, temperature is controlled at 705 ℃, and with 60mm/min, cooling water pressure is 0.3MPa, and flow is 250m
3The casting speed of/h pours into hot rolling ingot with aluminium liquid.Need to add rare earth aluminium titanium carbon (AlTiCRE) in casting process, need after the adding to guarantee that the content of Ti is 0.45%, the content of rare-earth elements of lanthanum (La) is 0.035%.Purpose is a crystal grain thinning, reduces or eliminates column crystal, and the removal of impurities of degassing purifies metal, reduces the ingot structure defective.Casting speed pours into hot rolling ingot with aluminium liquid.
3) will be used to make clad, down clad ingot casting and be used to make the sandwich layer ingot casting and saw respectively end to end and mill face, the single face milling amount is 15mm.As behind the sandwich layer ingot mill surface, thickness should be 360mm, and it is smooth to mill the rear surface, does not have sticking aluminium, no milling knurl, and limit portion burr polishes with frustrating cutter, covers the surface with plastic sheeting after milling the face end, prevents that dust from dropping in the surface;
The ingot casting that being used for after 4) will sawing end to end made upper and lower clad is placed on heating furnace, and heating-up temperature is 470 ℃, is incubated after 1 hour, ingot casting is rolled into the aluminium alloy plate of 52mm;
5) sandwich layer and clad seam face are cleaned, clean with No. 200 gasoline with mop or gauze earlier, clean seam face with cleaning fluid again, scrape clean surface with the rubber skin then, dry with clean silk again, and dry up with blower fan.
6) upper and lower clad aluminium alloy plate is covered on the upper and lower surface of sandwich layer ingot casting, and compress sandwich layer ingot casting and coating layer material, make contact-making surface closely smooth, adopt the aluminium wire bonding machine that the contact-making surface edge is carried out seam then with big slab ingot; Wherein in order to reduce the bare area of core ingot, surface oxidation degree when reducing follow-up heating to whole full welds on the whole length of clad up and down and sandwich layer faying face seam, gets final product at the enterprising spot welding of width.
7) with the alloy sheets after the seam in heating furnace, under 510 ℃ condition, be incubated after 3 hours, the beginning hot rolling, roll into the sheet material that thickness is 5.8mm;
For quality and the efficient that guarantees course of hot rolling, in the course of hot rolling of step 7), alloy sheets end face welding position after the seam is introduced into roll, the position, intermediate portion moves to the middle static pressure of milling train, depress by technological requirement, rolling 4 passages in two ends to the left and right, the 1-4 passage is dried rolling, drafts is 4mm.Passage is rolling by normal milling method later on, and emulsion concentration is adjusted into 4.3%, and finishing temperature is controlled at 340 ℃.
8) sheet material that 5.8mm is thick rolls into the thick foil of 0.18mm on cold-rolling mill;
9) foil that 0.18mm is thick is placed on and carries out intermediate annealing in the annealing furnace, and annealing temperature is 350 ℃, and foil keeps taking out after 5 hours to temperature, is cooled to normal temperature;
10) foil rolling that 0.18mm is thick becomes 0.14mm on cold-rolling mill, behind finishing straightening, accurate-shearing, promptly makes composite aluminum foil for car heat exchanger.
Claims (10)
1, a kind of manufacture method of composite aluminum foil for car heat exchanger is characterized in that: comprise the steps:
1) will according to 3 series alloys trades mark preparations as the raw material of clad aluminum foil sandwich layer with according to the raw material as the upper and lower clad of composite insulating foil of 4 series alloys trades mark preparation, join respectively in the smelting furnace, all melting under 740-750 ℃ the temperature, the aluminium liquid that forms put into respectively after the refining, slagging-off, stirring and leave standstill stove;
2) under 695-705 ℃ of temperature, sandwich layer aluminium liquid and upper and lower clad aluminium liquid are poured into ingot casting respectively;
3) ingot casting that will be used for making upper and lower clad is placed on heating furnace, and heating-up temperature is 460-470 ℃, after the insulation, ingot casting is rolled into the aluminium alloy plate of 48～52mm;
4) upper and lower surface that covers the sandwich layer ingot casting after the upper and lower clad aluminium alloy plate cleaning is carried out seam;
5) alloy sheets after the seam is incubated under 490-510 ℃ condition, begins hot rolling afterwards, roll into the sheet material that thickness is 5.0-5.8mm;
6) sheet material that 5.0-5.8mm is thick rolls into the thick foil of 0.09-0.18mm on cold-rolling mill;
7) foil that 0.09-0.18mm is thick is placed on and carries out intermediate annealing in the annealing furnace, and annealing temperature is 300-350 ℃, and foil keeps the back to take out to temperature, is cooled to normal temperature;
8) the thick foil rolling of 0.09-0.18mm after will annealing on the cold-rolling mill becomes 0.07-0.14mm, behind finishing straightening, accurate-shearing, and the car heat exchanger composite insulating foil of promptly making.
2, the manufacture method of composite aluminum foil for car heat exchanger according to claim 1, it is characterized in that: in the fusion process of step 1), use injection refining equipment, by crossing gas carrier Si is sprayed in the melt with crystallization silica flour form, silicon particle size is not more than 1.8mm, purity is not less than 99%, and both analysis Na, Li, Ca content all are controlled at 4.9 * 10 with it
-5Below the %, and Mn adds in the melt with the additive form, and Zn adds with the zinc ingot metal form.
3, the manufacture method of composite aluminum foil for car heat exchanger according to claim 1, it is characterized in that: in step 2) casting process in add rare earth aluminium titanium carbon AlTiCRE, need after the adding to guarantee that the content of Ti is 0.35-0.45%, the content of rare-earth elements of lanthanum (La) is 0.015-0.035%, and casting speed is 50-60mm/min.
4, the manufacture method of composite aluminum foil for car heat exchanger according to claim 1, it is characterized in that: in described step 2) and step 3) between, will be used to make clad, down clad ingot casting and be used to make the sandwich layer ingot casting and saw respectively end to end and mill face.
5, the manufacture method of composite aluminum foil for car heat exchanger according to claim 4 is characterized in that: as behind the sandwich layer ingot mill surface, thickness is 350～360mm, and limit portion burr polishes with frustrating cutter, covers the surface with plastic sheeting then.
6, the manufacture method of composite aluminum foil for car heat exchanger according to claim 1, it is characterized in that: step 4) center core layer and clad seam face are cleaned, should cooperate gasoline to clean with mop or gauze earlier, clean seam face with cleaning fluid again, scrape clean surface with the rubber skin then, dry with clean silk again, and dry up with blower fan.
7, the manufacture method of composite aluminum foil for car heat exchanger according to claim 1, it is characterized in that: step 4) center core layer and clad are carried out in the seam process, upper and lower clad aluminium alloy plate should be covered on the upper and lower surface of sandwich layer ingot casting, and compress sandwich layer ingot casting and coating layer material with big slab ingot, make contact-making surface closely smooth, adopt the aluminium wire bonding machine that the contact-making surface edge is carried out seam then.
8, the manufacture method of composite aluminum foil for car heat exchanger according to claim 7 is characterized in that: to whole full welds on the whole length of clad up and down and sandwich layer faying face seam, at the enterprising spot welding of width.
9, the manufacture method of composite aluminum foil for car heat exchanger according to claim 1 is characterized in that: in the course of hot rolling of step 5), alloy sheets blank end face welding position after the seam is introduced into roll, the position, intermediate portion moves to the middle static pressure of milling train.
10, the manufacture method of composite aluminum foil for car heat exchanger according to claim 9, it is characterized in that: rolling 4 passages in two ends to the left and right, the 1-4 passage is dried rolling, drafts≤4mm, passage is rolling by normal milling method later on, emulsion concentration is adjusted into 4.0-4.3%, and finishing temperature is controlled at 310-350 ℃.
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