CN114888117A - Aluminum-based composite pipe and manufacturing method thereof - Google Patents
Aluminum-based composite pipe and manufacturing method thereof Download PDFInfo
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- CN114888117A CN114888117A CN202210659787.7A CN202210659787A CN114888117A CN 114888117 A CN114888117 A CN 114888117A CN 202210659787 A CN202210659787 A CN 202210659787A CN 114888117 A CN114888117 A CN 114888117A
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- 239000002131 composite material Substances 0.000 title claims abstract description 100
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 91
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 38
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 18
- 239000000956 alloy Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 230000001680 brushing effect Effects 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 230000003647 oxidation Effects 0.000 claims abstract description 3
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 3
- 239000011701 zinc Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 239000010687 lubricating oil Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000005219 brazing Methods 0.000 claims description 5
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 4
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000001953 recrystallisation Methods 0.000 claims description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 49
- 230000007797 corrosion Effects 0.000 description 11
- 238000005260 corrosion Methods 0.000 description 11
- 230000007547 defect Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 4
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 4
- 239000000110 cooling liquid Substances 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000009785 tube rolling Methods 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- -1 aluminum-manganese Chemical compound 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/085—Making tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
- B32B1/08—Tubular products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2597/00—Tubular articles, e.g. hoses, pipes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention relates to the technical field of metallurgical composite pipes, in particular to an aluminum-based composite pipe, which comprises an inner composite aluminum layer and an outer composite aluminum layer, wherein the inner composite aluminum layer and the outer composite aluminum layer are compositely rolled on a joint surface to form a metallurgical bonding layer, and an alloy layer is composited on the outer surface of the outer composite aluminum layer; the aluminum-base composite pipe is produced through compounding outer composite aluminum layer with outer alloy layer at the surface temperature of 480-550 deg.c and extruding speed of 1-5m/min and cooling with 660-720 deg.c liquid aluminum alloy to form base pipe; brushing and grinding the surface of the pipe for the inner composite aluminum layer to remove an oxidation film, penetrating the pipe into a base pipe, and expanding the pipe to form a sleeved pipe blank; and (4) carrying out single-pass rolling on the sleeved pipe blank by using a planetary pipe mill. The invention has the advantages of less manufacturing procedures, high production efficiency and low manufacturing cost, and the aluminum-based composite pipe manufactured by the method has excellent quality and good mechanical property and can meet the requirements of subsequent processing and use.
Description
Technical Field
The invention relates to the technical field of metallurgical composite pipes, in particular to an aluminum-based composite pipe and a manufacturing method thereof.
Background
Aluminum and its alloy have good corrosion resistance, thermal conductivity and good mechanical properties, so that it is widely used as fluid delivery pipe in the fields and products of building, refrigeration, air conditioner, refrigerator, solar energy, water heater, condenser, radiator, etc.
Due to the inclusion and segregation of aluminum alloy during smelting and casting, the defect of perforation corrosion (pitting corrosion) of the pipe body is easy to appear during application. The zinc-aluminum alloy is commonly used as a sacrificial anode protection material of a pipe, the corrosion of fluid and environment to the zinc-aluminum alloy is generally in a plane uniform corrosion mode, but the strength of the zinc-aluminum alloy is difficult to meet the requirements of the pipe on the mechanical processing performances such as pressure resistance, flaring and the like. In the conventional method, thick plates of 7 series zinc-aluminum alloy and 3 series aluminum-manganese alloy are welded, then a composite strip is produced by adopting hot rolling and cold rolling processing methods, and then the composite strip is used for producing an aluminum composite pipe on a high-frequency pipe welding machine set. However, the leakage rate of the composite welded pipe is obviously higher than that of a seamless pipe, the leakage of the pipe almost appears on the welded seam, and meanwhile, the production process has long processing period, high cost and high selling price and limits the application of the production process.
Still another method for manufacturing aluminum-based composite tubes by using sleeve processing mainly includes sleeve rolling, drawing and extruding. The methods adopt the aluminum-based tube blank with the surface treated and the aluminum tube blank to be compounded to be sleeved, and then the aluminum-based tube blank is correspondingly rolled, drawn and extruded or the three methods are comprehensively used by a tube rolling machine, a drawing machine or an extruding machine, and the aluminum-based composite tube can be produced only by multi-pass rolling or drawing. The existing methods have the disadvantages of multiple processes, low yield, limited pipe length, low production efficiency, high cost and incapability of realizing large-scale production. The sample is easy to be taken out, but the industrialized product cannot be formed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an aluminum-based composite pipe and a manufacturing method thereof, the manufacturing method has the advantages of few manufacturing processes, high production efficiency and low manufacturing cost, and the aluminum-based composite pipe manufactured by the method has excellent quality and good mechanical property and can meet the requirements of subsequent processing and use.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the aluminum-based composite pipe comprises an inner composite aluminum layer and an outer composite aluminum layer, wherein the inner composite aluminum layer and the outer composite aluminum layer are compositely rolled on a joint surface to form a metallurgical bonding layer, and an alloy layer is composited on the outer surface of the outer composite aluminum layer.
As a further scheme of the invention, the thickness ratio of the inner composite aluminum layer to the outer composite aluminum layer is 5-20%.
As a further scheme of the invention, the thickness of the metallurgical bonding layer is 1-10 μm.
As a further scheme of the invention, the alloy layer is an aluminum alloy brazing filler metal layer, and the thickness of the aluminum alloy brazing filler metal layer is 8-12% of that of the outer composite aluminum layer.
As a further proposal of the invention, the material of the aluminum alloy solder layer is 4 series aluminum alloy.
As a further scheme of the invention, the alloy layer is an aluminum-zinc alloy layer, and the thickness of the aluminum-zinc alloy layer is 2-10% of that of the outer composite aluminum layer.
A manufacturing method of an aluminum-based composite pipe comprises the following specific steps:
step one, compounding an upper alloy layer on the outer surface of an outer composite aluminum layer with the extrusion speed of 1-5m/min at 480-550 ℃ and the surface temperature of the outlet of an extruder by using 660-720 ℃ liquid aluminum alloy, and cooling to prepare a base pipe;
secondly, brushing and grinding the surface of the pipe for the inner composite aluminum layer to remove an oxidation film, penetrating the pipe into the base pipe, and expanding the pipe to form a sleeved pipe blank;
and step three, carrying out single-pass rolling on the sleeved pipe blank by using a planetary pipe mill.
As a further scheme of the invention, the reduction of area is 50% -90% when rolling in the third step, the rolling speed is 8-12 m/min, the temperature rise of the deformation zone is 300-500 ℃, the inner surface of the sleeved pipe blank, which is in contact with the rolling mill mandrel, is coated with high-viscosity lubricating oil, the structure of the rolled pipe is in a recrystallization state, and the layers are combined into a metallurgical bonding layer.
In a further aspect of the present invention, the outlet pipe of the extruder is made of 3-series, 5-series, or 6-series aluminum alloy.
As a further scheme of the invention, the material of the alloy layer is 3 series aluminum alloy + (0.5% -2.5%) Zn or 7072 aluminum alloy; the pipe material of the inner composite aluminum layer is 3 series aluminum alloy + (0.5% -2.5%) Zn or 7072 aluminum alloy or red copper.
As the technical scheme is adopted, the invention has the advantages and positive effects that:
1. the aluminum-based composite pipe prepared by the method has good mechanical property and can meet the requirements of subsequent processing and use;
2. the aluminum-based composite pipe prepared by the method has wide application and can greatly reduce the production cost of products;
3. the manufacturing method of the invention can realize metallurgical bonding of the aluminum-aluminum bonding surface and can also realize that the tube structure is completely converted into a recrystallized structure;
4. the manufacturing method of the invention has the advantages of less working procedures, high efficiency and low cost, and can produce the aluminum-based composite pipe in large batch.
Drawings
Figure 1 is a schematic cross-sectional view of an aluminum-based composite pipe of the present invention.
In the figure: 1 is an inner composite aluminum layer, 2 is an outer composite aluminum layer, 3 is a metallurgical bonding layer, and 4 is an alloy layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in FIG. 1, the present invention produces an aluminum composite pipe with internal and external corrosion resistance. Rolling the aluminum-based composite pipe with the inner layer 7072 aluminum alloy and the middle 3003 aluminum alloy. The rolling is carried out on a three-roller planetary tube mill. The outer composite pipe blank is produced with a 3003 aluminum alloy pipe of 48X 11.25mm diameter extruded in a horizontal extruder as base pipe, the aluminum pipe has surface temperature of 520 deg.c and speed of 3m/min, the base pipe passes through 7072 aluminum liquid bag in the outlet, the aluminum liquid temperature is 700 and 720 deg.c, and there are graphite guide molds before and after the aluminum liquid bag. The base pipe is out of the guide die, the specification is phi 52 multiplied by 13.25mm, the length is 15m after the base pipe is cut to length, and the base pipe is used as a composite sleeved base pipe. The inner composite layer 7072 aluminum alloy pipe is extruded by an extruder and drawn by 20 percent plastic deformation, and has the length of 15.2m and the diameter of 24 multiplied by 1.5 mm; deoiling the surface of the 7072 pipe, removing a surface oxide layer by using a steel brush to polish, penetrating into a base pipe, expanding the pipe to enable the inner pipe and the outer pipe to be attached, and coating a layer of high-viscosity lubricating oil in the pipe while expanding the pipe. And (4) after the core rod is penetrated, sending the core rod into a three-roller planetary tube mill for single-pass composite rolling. The exit rolling speed of the rolled pipe is controlled to be 10 m/min by adjusting the parameters of the three-roller planetary pipe mill such as the rotating speed, the flow rate of cooling liquid, the feeding amount of a pipe blank and the like, the exit temperature of a pipe deformation area is about 400 ℃, the exit size is phi 32 multiplied by 2mm, and the single-pass reduction of area is about 89.1%. The rolled pipe enters an emulsion bath with the length of 1m, is rapidly cooled to room temperature, and then is bent into a coil to enter a charging basket with the diameter of phi 3 m. The inner surface and the outer surface of the prepared composite pipe and the pipe body have no fold lines, cracks or other defects, the metallurgical bonding of the bonding surface is completely realized, and the surface of the core rod has no aluminum-sticking trace. The pipe can be processed into a good pipe blank of the corrosion-resistant internal thread aluminum pipe through subsequent drawing, and the product is used for an evaporator and a condenser of a household air conditioner. The solar heat collector can also be used for replacing copper pipes.
Example 2
The invention produces seamless headers. And compositely rolling the aluminum-based composite pipe with an outer layer of 4045 aluminum alloy, a middle part of 3003 aluminum alloy and an inner layer of 7072 aluminum alloy. The rolling is carried out on a three-roller planetary tube mill. The outer composite pipe blank is produced by extruding a 3003 aluminum alloy pipe with the diameter of 48X 11.25mm with a horizontal extruder as a base pipe, wherein the surface temperature of the aluminum pipe during extrusion is 520 ℃, the speed is 3m/min, the base pipe passes through a 4045 aluminum liquid bag arranged at an outlet, the temperature of the aluminum liquid is 660 and 680 ℃, and graphite guide dies are arranged in front of and behind the aluminum liquid bag. The base pipe is out of the guide die, the specification is phi 52 multiplied by 13.25mm, the length is 15m after the base pipe is cut to length, and the base pipe is used as a composite sleeved base pipe. In order to ensure that the proportion of the thickness of the outer composite layer to the total wall thickness meets the standard, the outer diameter of the sized base pipe is milled to phi 51mm through a surface milling machine. The inner composite layer 7072 aluminum alloy pipe is extruded by an extruder and drawn by 20 percent plastic deformation, and has the length of 15.2m and the diameter of 24 multiplied by 1.5 mm; deoiling the surface of the 7072 pipe, removing a surface oxide layer by using a steel brush to polish, penetrating into a base pipe, expanding the pipe to enable the inner pipe and the outer pipe to be attached, and coating a layer of high-viscosity lubricating oil in the pipe while expanding the pipe. And (4) after the core rod is penetrated, sending the core rod into a three-roller planetary tube mill for single-pass composite rolling. The exit rolling speed of the rolled pipe is controlled to be 10 m/min by adjusting the parameters of the three-roller planetary pipe mill, such as the rotating speed, the flow of cooling liquid in a deformation zone, the feeding amount of a pipe blank and the like, the temperature of the pipe exiting the deformation zone is about 400 ℃, the exit dimension is phi 32 multiplied by 2mm, and the single-pass reduction of area is about 88.5 percent. After rolling, the pipe enters an emulsion bath with the length of 1m to be rapidly cooled to room temperature, and then is bent into a coil to enter a charging basket with the diameter of phi 3 m. The inner surface and the outer surface of the prepared composite pipe and the pipe body have no fold lines, cracks or other defects, the metallurgical bonding of the bonding surface is completely realized, and the surface of the core rod has no aluminum-sticking trace. The pipe can be processed into a collecting pipe for the micro-channel radiator through drawing for 2 times.
Example 3
The invention produces the internal and external corrosion-resistant aluminum-based composite pipe. Rolling the aluminum-based composite pipe with the inner layer 3003+1% of Zn aluminum alloy, the middle layer 3003 aluminum alloy and the aluminum matrix. The rolling is carried out on a three-roller planetary tube mill. The composite pipe blank is produced with 3003 aluminum alloy pipe of 48X 11.25mm diameter extruded in a horizontal extruder as base pipe, the aluminum pipe has surface temperature of 520 deg.c and speed of 3m/min, the base pipe passes through 3003+1% Zn aluminum liquid bag in the outlet, the aluminum liquid has temperature of 700 plus 720 deg.c, and there are graphite guide molds in the front and back of the aluminum liquid bag. The base pipe is out of the guide die, the specification is phi 52 multiplied by 13.25mm, the length is 15m after the base pipe is cut to length, and the base pipe is used as a composite sleeved base pipe. The internal composite layer 3003+1% Zn aluminum alloy pipe is an aluminum alloy pipe with phi 24 multiplied by 1.5mm which is extruded by an extruder and then drawn by 20% plastic deformation, and the length is 15.2 m; the surface of a 3003+1% Zn pipe is degreased, a steel wire brush is used for grinding to remove a surface oxide layer, then the surface oxide layer penetrates into a base pipe, then the pipe expansion is carried out to enable an inner pipe and an outer pipe to be attached, and a layer of high-viscosity lubricating oil is coated in the pipe while the pipe is expanded. And after the core rod is penetrated, the core rod is sent into a three-roller planetary tube mill for single-pass composite rolling. The exit rolling speed of the rolled pipe is controlled to be 10 m/min by adjusting the parameters of the three-roller planetary pipe mill such as the rotating speed, the flow rate of cooling liquid, the feeding amount of a pipe blank and the like, the exit temperature of a pipe deformation area is about 400 ℃, the exit size is phi 32 multiplied by 2mm, and the single-pass reduction of area is about 89.1%. The rolled pipe enters an emulsion bath with the length of 1m, is rapidly cooled to room temperature, and then is bent into a coil to enter a charging basket with the diameter of phi 3 m. The inner surface and the outer surface of the prepared composite pipe and the pipe body have no fold lines, cracks or other defects, the metallurgical bonding of the bonding surface is completely realized, and the surface of the core rod has no aluminum-sticking trace. The pipe can be processed into a good pipe blank of the corrosion-resistant internal thread aluminum pipe through subsequent drawing, and the product is used for an evaporator and a condenser of a household air conditioner. The solar heat collector can also be used for replacing copper pipes.
Example 4
The invention produces an aluminum-based composite pipe with the outer surface of 7072 protective layer, the middle part of 3003 aluminum alloy and the inner layer of T2 red copper. The rolling is carried out on a three-roller planetary tube mill. The outer composite pipe blank is produced by extruding a 3003 aluminum alloy pipe with the diameter of 48X 11.25mm with a horizontal extruder as a base pipe, wherein the surface temperature of the aluminum pipe during extrusion is 520 ℃, the speed is 2m/min, the base pipe passes through a 7072 aluminum liquid bag arranged at an outlet, the temperature of the aluminum liquid is 680-710 ℃, and graphite guide dies are arranged in front of and behind the aluminum liquid bag. The base pipe is made into a composite sleeved base pipe with the specification of phi 52 multiplied by 13.25mm after being discharged from a guide die, the length of the base pipe after being cut to length is 15m, and the surface of the base pipe is precisely milled into a surface with the specification of phi 50 multiplied by 12.25 mm. The red copper tube made of the internal composite layer T2 is in an annealing state, the specification is phi 24 multiplied by 1.2mm, and the length is 15.2 m; removing oil on the surface of the copper tube, removing an oxide layer on the surface by using a steel wire brush, and then penetrating into the base tube to expand the tube so as to joint the inner tube and the outer tube. And (4) after the core rod is penetrated, sending the core rod into a three-roller planetary tube mill for single-pass composite rolling. The exit rolling speed of the rolled pipe is controlled to be 12 m/min by adjusting the parameters of the three-roller planetary pipe mill such as the rotating speed, the flow of cooling liquid, the feeding amount of pipe blanks and the like, the exit temperature of a pipe deformation zone is 400-450 ℃, the exit size is phi 30 multiplied by 2mm, and the single-pass reduction of area is about 88.6%. The rolled pipe enters an emulsion bath with the length of 1m, is rapidly cooled to room temperature, and then is bent into a coil to enter a charging basket with the diameter of phi 3 m. The inner surface and the outer surface of the prepared composite pipe and the pipe body have no folding, cracking or other defects, and the copper-aluminum junction surface realizes metallurgical bonding. The pipe can be made into a corrosion-resistant inner thread copper-aluminum composite pipe through subsequent drawing processing, and the product is used for an evaporator and a condenser of a household air conditioner.
The invention produces the inner corrosion-resistant composite pipe. As a special example of the invention, the tube is directly extruded into 3003 aluminum tube blank without liquid cladding. The rolling is carried out on a three-roller planetary tube rolling machine, the initial size of a 3003 aluminum tube blank is phi 48 multiplied by 11.25mm, a 7072 tube blank with phi 24 multiplied by 1mm is penetrated through the tube blank, the outer surface of the tube blank is degreased and brushed after 20% plastic deformation hardening, after the tube blank is in place, the inner tube expansion tube and the outer tube are fixed, and meanwhile, high-viscosity lubricating oil is coated in the 7072 tube. Introducing into a three-roller planetary tube rolling mill, rolling thereafter, as with the first embodiment, wherein the deformation zone temperature is 350 ℃, the exit rolling speed is 9 m/min, the single pass reduction of area is about 86.3%, the specification of the composite tube after rolling is phi 32 x 2mm, the composite tube is collected in a charging basket, the surface of the composite tube and the tube body have no fold lines and layering phenomena, and the tensile strength and the elongation are respectively 110-115MPa and 35-40%. Through detection, the metallographic structure of the pipe body of the rolled composite pipe is compact and is in a recrystallization state, the metallurgical bonding of the bonding surface is completely realized, and the rolling is successful. The composite pipe has good drawability in subsequent processing, and can be processed into products such as a solar heat collecting pipe for fluid transportation and the like meeting requirements.
In conclusion, the method for manufacturing the aluminum-based pipe has the advantages of few working procedures, high production efficiency, high yield, low manufacturing cost, good quality of the manufactured pipe and the like, overcomes the defects and the shortcomings of the prior art, and has obvious substantive characteristics and obvious technical progress compared with the prior art.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
Claims (10)
1. An aluminum-based composite pipe, characterized in that: the composite pipe comprises an inner composite aluminum layer (1) and an outer composite aluminum layer (2), the inner composite aluminum layer (1) and the outer composite aluminum layer (2) are compositely rolled on a joint surface to form a metallurgical bonding layer (3), and an alloy layer (4) is composited on the outer surface of the outer composite aluminum layer (2).
2. The aluminum-based composite pipe of claim 1, wherein: the thickness ratio of the inner composite aluminum layer (1) to the outer composite aluminum layer (2) is 5-20%.
3. The aluminum-based composite pipe of claim 1, wherein: the thickness of the metallurgical bonding layer (3) is 1-10 mu m.
4. The aluminum-based composite pipe of claim 1, wherein: the alloy layer (4) is an aluminum alloy brazing filler metal layer, and the thickness of the aluminum alloy brazing filler metal layer is 8% -12% of the thickness of the outer composite aluminum layer (2).
5. The aluminum-based composite pipe and the manufacturing method thereof as claimed in claim 4, wherein: the aluminum alloy brazing material layer is made of 4-series aluminum alloy.
6. The aluminum-based composite pipe and the manufacturing method thereof according to claim 1, wherein: the alloy layer (4) is an aluminum-zinc alloy layer, and the thickness of the aluminum-zinc alloy layer is 2% -10% of that of the outer composite aluminum layer (2).
7. A method for manufacturing an aluminum-based composite pipe is characterized by comprising the following steps: the method comprises the following specific steps:
step one, cooling an upper alloy layer (4) compounded on the outer surface of an outer composite aluminum layer (2) with the temperature of 480-550 ℃ and the extrusion speed of 1-5m/min by using 660-720 ℃ liquid aluminum alloy to prepare a base pipe;
secondly, brushing and grinding the outer surface of the pipe for the inner composite aluminum layer (1) to remove an oxidation film, penetrating the pipe into a base pipe, and expanding the pipe to form a sleeved pipe blank;
and step three, carrying out single-pass rolling on the sleeved pipe blank by using a planetary pipe mill.
8. The aluminum-based composite pipe and the manufacturing method thereof as claimed in claim 7, wherein: and in the third step, the reduction of area is 50-90%, the rolling speed is 8-12 m/min, the temperature rise of a deformation zone is 300-500 ℃, the inner surface of the sleeved pipe blank, which is in contact with a rolling mill mandrel, is coated with high-viscosity lubricating oil, the structure of the rolled pipe is in a recrystallization state, and the layers are combined into a metallurgical bonding layer (3).
9. The method of manufacturing an aluminum-based composite pipe as recited in claim 7, wherein: the outlet pipe of the extruder is made of 3 series, 5 series and 6 series aluminum alloys.
10. The method of manufacturing an aluminum-based composite pipe as recited in claim 7, wherein: the alloy layer (4) is made of 3 series aluminum alloy + (0.5% -2.5%) Zn or 7072 aluminum alloy; the pipe material of the inner composite aluminum layer (1) is 3 series aluminum alloy + (0.5% -2.5%) Zn or 7072 aluminum alloy or red copper.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210659787.7A CN114888117A (en) | 2022-06-13 | 2022-06-13 | Aluminum-based composite pipe and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210659787.7A CN114888117A (en) | 2022-06-13 | 2022-06-13 | Aluminum-based composite pipe and manufacturing method thereof |
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| CN114888117A true CN114888117A (en) | 2022-08-12 |
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| CN202210659787.7A Withdrawn CN114888117A (en) | 2022-06-13 | 2022-06-13 | Aluminum-based composite pipe and manufacturing method thereof |
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| Country | Link |
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| CN (1) | CN114888117A (en) |
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- 2022-06-13 CN CN202210659787.7A patent/CN114888117A/en not_active Withdrawn
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Application publication date: 20220812 |