CN110976671A - Solid particle medium forming method and device for aluminum-clad magnesium composite pipe fitting - Google Patents

Solid particle medium forming method and device for aluminum-clad magnesium composite pipe fitting Download PDF

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Publication number
CN110976671A
CN110976671A CN201911275807.5A CN201911275807A CN110976671A CN 110976671 A CN110976671 A CN 110976671A CN 201911275807 A CN201911275807 A CN 201911275807A CN 110976671 A CN110976671 A CN 110976671A
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gland
die
punch
pipe
alloy pipe
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CN201911275807.5A
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林鹏
黄钟森
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Taiyuan University of Technology
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Taiyuan University of Technology
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Priority to CN201911275807.5A priority Critical patent/CN110976671A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B21D39/048—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods using presses for radially crimping tubular elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
    • B23K20/023—Thermo-compression bonding

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The invention discloses a method and a device for forming solid particle media of an aluminum-clad magnesium composite pipe fitting, wherein a die sleeve and a die core are arranged on a workbench, a thermocouple is arranged in the die core, and a die cavity is arranged between the die cores; the top of the die is provided with an upper gland, the bottom of the die is provided with a lower gland, the centers of the upper gland and the lower gland are provided with through holes, an upper punch is penetrated in the through hole of the upper gland, a lower pressure head is movably penetrated in the through hole of the lower gland, and the upper punch and the lower punch are both connected with a hydraulic system; water cooling pipes are arranged in the upper gland and the lower gland, and an induction heating coil is arranged on the outer ring of the die; firstly, the magnesium alloy and the aluminum alloy pipe are overlapped, solid particle medium is adopted for stretch forming, and the aluminum-coated magnesium alloy component with continuous structure, high layer interface strength and good corrosion resistance is finally obtained by controlling forming and connecting temperature, time and pressure. The method and the device save the previous process of preparing the composite board, reduce the cost, improve the efficiency and simultaneously avoid the interface layer damage caused by the bulging forming of the composite board.

Description

Solid particle medium forming method and device for aluminum-clad magnesium composite pipe fitting
Technical Field
The invention discloses a method and a device for forming solid particle media of an aluminum-clad magnesium composite pipe fitting, and belongs to the technical field of composite pipe forming.
Background
Poor corrosion resistance of magnesium and magnesium alloys is one of the major factors limiting their widespread use. In order to improve the corrosion resistance, the surface of the alloy can be modified, and common methods include a chemical conversion film method, anodic oxidation, vapor deposition, laser cladding, thermal spraying and the like. However, these methods require special equipment, and the process is complicated and the production cost is high. In contrast, aluminum and aluminum alloys generally have better corrosion resistance and plastic formability, and have good surface repairability and decorativeness. Therefore, the magnesium alloy product is coated with the aluminum alloy layer with good corrosion resistance to prepare the aluminum alloy coated magnesium alloy member, so that the magnesium alloy substrate can be protected, and the advantages of high specific strength and specific rigidity, good damping performance, good electromagnetic wave shielding performance and the like can be exerted, and special surface modification equipment and process are not needed. At present, for aluminum alloy coated magnesium alloy composite pipe fittings, the traditional processing method is to prepare an aluminum alloy coated magnesium alloy composite plate by various processing methods, and then to weld the aluminum alloy coated magnesium alloy composite plate after pipe coiling to obtain an aluminum magnesium alloy welded pipe blank; or obtaining the aluminum magnesium alloy pipe blank by an extrusion process at high temperature.
In recent years, diffusion bonding, explosion cladding, and the like have been commonly used as methods for producing composite pipes. The rolling compounding method is characterized in that two kinds of metal plates with clean surfaces are overlapped, the plate combination interface is stably connected through the powerful acting force of a rolling mill and the heat treatment process, the thickness of the aluminum-clad magnesium composite plate is obtained, and then the composite pipe fitting is obtained through pipe coiling and welding. The diffusion bonding method is to keep the metal pipes overlapped with each other under the action of high temperature and high pressure for a certain time to cause the diffusion between atoms to form firm diffusion bonding. The explosion cladding method is a special welding technology, and realizes metallurgical bonding at an interface by causing metal movement to collide and deform through high-pressure shock waves generated by explosive explosion. The three methods can successfully prepare the aluminum alloy coated magnesium alloy composite tube, but hard and brittle intermetallic compounds are generated at the interface, so that the forming performance of the composite tube is reduced in the subsequent processing process, and interlayer cracking is easy to occur. Therefore, the process of firstly preparing the composite plate and then forming the tubular product has the advantages of complex process flow, large energy consumption, low production efficiency and high production cost, and the formed multilayer structural component has serious layer interface cracking and low part quality.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the method and the device for forming the solid particle medium of the aluminum-clad magnesium composite pipe fitting.
The invention is realized by the following technical scheme:
a solid particle medium forming device for an aluminum-clad magnesium composite pipe fitting comprises a workbench, a die, an induction heating coil and a hydraulic system;
the workbench is provided with a mold, the mold comprises a mold sleeve and a mold core, the mold core is detachably embedded in the mold sleeve, the mold core is internally provided with a thermocouple, the mold core comprises two symmetrical halves, and a hollow mold cavity is arranged between the two halves of the mold core; the top of the die is provided with an upper gland, the bottom of the die is provided with a lower gland, the bottom of the lower gland is connected with a workbench, clamping bosses are arranged at the centers of the upper gland and the lower gland respectively, a through hole is arranged at the center of each clamping boss, an upper punch is penetrated in the through hole of the upper gland, a lower press head is movably penetrated in the through hole of the lower gland, and the upper punch and the lower punch are both connected with a hydraulic system;
the upper gland and the lower gland are clamped in the die cavity through clamping bosses, water cooling pipes are arranged in the upper gland and the lower gland, and the water cooling pipes are connected with a water cooling machine;
the die is characterized in that an induction heating coil is arranged on the outer ring of the die and connected with an induction heating power supply.
The hydraulic system comprises a hydraulic cylinder, a hydraulic frame and an ejection cylinder, the hydraulic frame is arranged on a workbench, a hydraulic slide block penetrates through the upper part of the hydraulic frame, a hydraulic upper cross beam is arranged at the top of the hydraulic frame, the hydraulic cylinder is arranged in the middle of the hydraulic upper cross beam, the hydraulic slide block is connected with the bottom of the hydraulic cylinder, a die holder is arranged at the bottom of the hydraulic slide block, a spring is arranged between the die holder and an upper gland, and an upper punch is connected with the bottom of the die; the bottom of the workbench is provided with a jacking cylinder, and the jacking cylinder is connected with the lower punch; the hydraulic cylinder and the ejection cylinder are connected with a hydraulic pump station, and the hydraulic pump station is controlled by a control console.
A solid particle medium forming method for an aluminum-clad magnesium composite pipe fitting comprises the following steps:
firstly, preparing a magnesium alloy pipe, an outer aluminum alloy pipe and an inner aluminum alloy pipe, and cutting the magnesium alloy pipe, the outer aluminum alloy pipe and the inner aluminum alloy pipe to be equal in length;
secondly, performing surface treatment on the cut magnesium alloy and aluminum alloy pipe to remove oxide skins on the inner side and the outer side of the magnesium alloy and aluminum alloy pipe;
thirdly, the lower press cover is arranged on a workbench of the hydraulic press and is aligned with the lower punch;
step four, the two split mold cores are closed and then placed into a mold sleeve; placing the mold core and the mold sleeve on a lower gland and positioning the mold core and the mold sleeve through a clamping boss of the lower gland, respectively sleeving an embedded aluminum alloy pipe and an outer sleeved aluminum alloy pipe into the inner side and the outer side of the magnesium alloy pipe to form a laminated pipe, and placing the laminated pipe in the mold core; filling solid particles with the volume of 0.6-0.8 times of that of the die cavity into the die cavity as a pressure transmission medium; placing the upper gland on the mold core and the mold sleeve and positioning the upper gland and the mold core;
fifthly, adjusting the height of the induction heating coil to enable the induction heating coil to be sleeved outside the die sleeve, adjusting the positions of the upper punch and the lower punch to enable the induction heating coil to contact solid medium particles without generating pressure, and enabling a spring fixed on the die holder to apply pressure to the upper pressing plate;
step six, heating the die and the blank to a forming temperature T1, and enabling the upper punch and the lower punch to simultaneously apply pressure P to the solid particle medium respectively0The laminated tube is plastically deformed, and after the upper punch and the lower punch contact with the solid particle mediumThe feed displacement of the upper punch and the lower punch is as follows: s = V/2L, wherein V is the bulging amount of the pipe fitting, and L is the cross-sectional area of the punch;
step seven, after the part is formed, the formed part and the solid particle medium are connected at the connection temperature T1 and the connection pressure P1And in time t, realizing diffusion connection among the multilayer pipes;
and step eight, opening the two-petal mold core, and taking the part to finish the preparation of the multilayer pipe fitting of the aluminum alloy pipe coated with the magnesium alloy.
Preferably, the thickness of the magnesium alloy pipe is less than 5mm, the thickness of the outer sleeve aluminum alloy pipe and the thickness of the inner embedded aluminum alloy pipe are less than 3mm, the inner diameter of the outer sleeve aluminum alloy pipe is greater than the outer diameter of the magnesium alloy pipe by 0.5-1.0 mm, and the outer diameter of the inner embedded aluminum alloy pipe is less than the inner diameter of the magnesium alloy pipe by 0.5-1.0 mm.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of firstly superposing the magnesium alloy and the aluminum alloy pipe, carrying out stretch forming by adopting a solid particle medium in a certain temperature range, continuing to carry out high-temperature pressure maintaining for a certain time after the laminated pipe is fully adhered to a mold, so that the laminated pipe realizes diffusion connection under the action of high temperature and high pressure, and finally obtaining the aluminum-coated magnesium alloy component with continuous structure, high layer interface strength and good corrosion resistance by controlling forming and connecting temperature, time and pressure. The invention omits the previous process of preparing the composite board, adopts solid particle medium expansion to realize full film pasting of the pipe fitting, and has excellent quality and precision of the obtained part. The cost is reduced, the efficiency is improved, and meanwhile, the interface layer damage caused by secondary forming of the composite board is avoided.
(1) The application range is wide. According to the method and the device, the combination mode of different pipes is mechanical combination and diffusion connection combination, so that the combination of one or more of various alloy pipes such as aluminum alloy, titanium alloy, copper alloy and the like and the magnesium alloy pipe can be realized.
(2) Low cost and high efficiency. At present, the traditional method for manufacturing the aluminum alloy-coated magnesium alloy multilayer structural part is to firstly prepare other metal-coated magnesium alloy composite plates by rolling, hot pressing and other methods, and then perform pipe coiling welding forming on the composite plates to prepare the multilayer structural part. The invention directly carries out sleeve superposition forming and diffusion connection compounding on the aluminum alloy pipe and the magnesium alloy pipe, namely, the forming and compounding integration of the multilayer pipe is realized, the previous process of preparing the composite plate is omitted, the cost can be greatly reduced, and the efficiency is improved.
(3) The layer interface bonding was good. The invention carries out compounding after the multilayer pipe is formed, can avoid the problem of interlayer cracking caused by deformation in the forming process of the traditional composite plate reelpipe, and can realize good layer interface combination among the multilayer pipes.
(4) The mold has low cost and can form a complex inner cavity. The invention adopts solid particles as forming media, has low requirements on the shape and the precision of the male die, and has strong universality of the male die, thereby reducing the processing cost of the die. Compared with the simple deep drawing forming, the fluid medium forming can form the member with the complex inner cavity.
Drawings
FIG. 1 is a schematic view of the Al/Mg/Al pipe member of the present invention alternately stacked;
FIG. 2 is a schematic view of a forming apparatus according to the present invention;
FIG. 3 is a sectional view showing the forming die and the tube blank in the initial state of the invention;
fig. 4 is a sectional view showing a state where the forming die and the laminated tube of the present invention are formed.
In the figure, 1 is an upper punch, 2 is a lower punch, 3 is an upper gland, 4 is a lower gland, 5 is a water-cooled tube, 6 is a die sleeve, 7 is a die core, 8 is a thermocouple, and 9 is a magnesium-aluminum pipe fitting; 10 is a workbench, 11 is a hydraulic press console, 12 is a hydraulic press upper beam, 13 is a spring, 14 is a hydraulic frame, 15 is an industrial water-cooling machine, 16 is an ejection cylinder, 17 is an induction heating coil, 18 is a bracket, 19 is an induction heating power supply, 20 is a die cavity, 21 is a clamping boss, 22 is a hydraulic press slide block, 23 is a hydraulic cylinder, 24 is a die holder, 25 is a pressure transfer medium, 26 is a magnesium alloy tube, 27 is an outer sleeve aluminum alloy tube, and 28 is an embedded aluminum alloy tube.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the scope of the present invention is not limited to these examples, and all changes or equivalent substitutions that do not depart from the spirit of the present invention are intended to be included within the scope of the present invention.
Example 1
A solid particle medium forming device for an aluminum-clad magnesium composite pipe fitting comprises a workbench 10, a die, an induction heating coil 17 and a hydraulic system;
a mould is arranged on the workbench 10 and comprises a mould sleeve 6 and a mould core 7, the mould core 7 is detachably embedded in the mould sleeve 6, a thermocouple 8 is arranged in the mould core 7, the mould core 7 comprises two symmetrical halves, and a hollow mould cavity 20 is arranged between the two halves of the mould core; the top of the die is provided with an upper gland 3, the bottom of the die is provided with a lower gland 4, the bottom of the lower gland 4 is connected with a workbench 10, the centers of the upper gland 3 and the lower gland 4 are both provided with a clamping boss 21, the center of the clamping boss 21 is provided with a through hole, the through hole of the upper gland 3 penetrates through the clamping boss 21 and the upper gland 3, an upper punch 1 is penetrated in the through hole, the through hole of the lower gland penetrates through the clamping boss and the lower gland, a lower punch 2 is movably penetrated in the through hole, and the upper punch 1 and the lower punch 2 are both connected with a hydraulic system;
the upper gland 3 and the lower gland 4 are clamped in the die cavity 20 through clamping bosses 21, water-cooled tubes 5 are arranged in the upper gland 3 and the lower gland 4, and the water-cooled tubes 5 are connected with a water-cooled machine 15;
the outer ring of the die is provided with an induction heating coil 17, the induction heating coil 17 is connected with an induction heating power supply, and the induction heating coil 17 is connected with the workbench 10 through a support 18.
The hydraulic system comprises a hydraulic cylinder 23, a hydraulic machine frame 14, a jacking cylinder 16, a hydraulic pump station and a control console, wherein the hydraulic machine frame 14 is arranged on the workbench 10, a hydraulic machine sliding block 22 penetrates through the upper part of the hydraulic machine frame 14, and a hydraulic machine upper cross beam 12 is arranged at the top of the hydraulic machine frame; the middle part of the upper cross beam 12 of the hydraulic machine is provided with a hydraulic cylinder 23, the bottom of the hydraulic cylinder 23 is connected with a hydraulic machine slide block 22, the bottom of the hydraulic machine slide block 22 is provided with a die holder 24, a spring 13 is arranged between the die holder 24 and the upper gland 3, the bottom of the die holder 24 is connected with an upper punch 1, the bottom of the workbench 10 is provided with a knockout cylinder 16, the knockout cylinder 16 is connected with a lower punch 4, and the lower punch 4 is movably arranged in a hollow cavity die cavity 20 of the die core.
The size of the upper punch and the lower punch is matched with the through hole in the center of the upper gland and the lower gland, and the size of the lower punch 4 is smaller than that of the through hole in the center of the lower gland, so that the lower punch can freely pass through the through hole in the center of the lower gland.
The hydraulic cylinder 23 is connected with a hydraulic pump station, the hydraulic cylinder and the ejection cylinder are both connected with the hydraulic pump station, and the hydraulic pump station is controlled by a hydraulic machine control console 11.
The solid particle medium forming method for the aluminum-clad magnesium composite pipe fitting by using the device comprises the following steps:
firstly, preparing a magnesium alloy pipe, an outer aluminum alloy pipe and an inner aluminum alloy pipe, and cutting the magnesium alloy pipe, the outer aluminum alloy pipe and the inner aluminum alloy pipe to be equal in length; according to the requirements of the geometric dimension and performance of a formed component, the selected magnesium alloy pipe is AZ31, the thickness is 2mm, the inner diameter is 45mm, in order to improve the corrosion resistance of the component, the pipe for coating is an antirust aluminum alloy 5052 pipe, the thickness is 0.5mm, the inner diameter is 44mm and 46mm, and the size of the pipe is determined by the geometric dimension of the component.
Step two, performing surface treatment on the cut magnesium alloy and aluminum alloy pipes, and removing surface oxide skins, which are in contact with each other, of the cut AZ31 and 5052 pipes by adopting an electric steel wire brush to expose the surfaces of fresh matrixes so as to promote the diffusion bonding of the two;
step three, placing the lower press cover on a hydraulic press workbench to be aligned with the lower punch, placing the AZ31 magnesium alloy pipe in the middle, placing the 5052 pipe outside and inside the AZ31 pipe for stacking, and placing the laminated pipe between the upper punch and the lower punch, as shown in figure 3, coating a layer of boron nitride solder resist on the upper surface and the lower surface of the laminated pipe, which are in contact with the die, and coating a layer of boron nitride solder resist on the upper punch, the lower punch and the inner wall of the die cavity, so that the die is prevented from being adhered to the formed part and is not easy to demould, and the lubricating effect is achieved, so that the material is easy to flow and fill the die, and then realizing the edge pressing;
step four, the two split mold cores are closed and then placed into a mold sleeve; placing the mold core and the mold sleeve on a lower gland and positioning the mold core and the mold sleeve through a clamping boss of the lower gland, respectively sleeving an embedded aluminum alloy pipe and an outer sleeved aluminum alloy pipe into the inner side and the outer side of the magnesium alloy pipe to form a laminated pipe, and placing the laminated pipe in the mold core; filling quartz sand with the granularity of less than 1mm, which is 0.6-0.8 times of the volume of the die cavity, into the die cavity as a pressure transfer medium; placing the upper gland on the mold core and the mold sleeve and positioning the upper gland and the mold core; preferably, the pressure-transmitting medium is filled in an amount of 0.75 times the volume of the mold cavity.
Adjusting the height of the induction heating coil support to enable the induction heating coil to be sleeved outside the die sleeve, adjusting the positions of the upper punch and the lower punch to enable the upper punch and the lower punch to be in contact with solid medium particles but not generate pressure, and enabling a spring fixed on the die holder to apply pressure to the upper pressing plate;
step six, heating the die and the blank to 300 ℃ to enable the multilayer tube to be formed under the pressure transfer effect of the quartz sand particle medium, as shown in figure 4;
the upper punch and the lower punch respectively and simultaneously apply 10MPa pressure to the solid particle medium to enable the laminated pipe to generate plastic deformation, the plastic deformation degree is controlled by the displacement after the upper punch and the lower punch contact the solid particle medium, and the total feeding displacement of the upper punch and the lower punch is as follows: the bulging capacity (or core volume) of the tube was 502.4cm3Divided by the cross-sectional area of the punch 38.5cm2The feed displacement of a single punch is 6.5 cm;
and step seven, after the part is formed and pasted with the film, heating the die and the blank to 400 ℃, and keeping the formed part for 1h under the pressure of 20MPa, so that the diffusion connection among the multilayer pipes is realized.
And step eight, opening the two-petal mold core, and taking the part to finish the preparation of the multilayer pipe fitting of the aluminum alloy pipe coated with the magnesium alloy.
Preferably, the thickness of the magnesium alloy pipe is less than 5mm, the thickness of the outer aluminum alloy pipe and the thickness of the inner aluminum alloy pipe are less than 3mm, the inner diameter of the outer aluminum alloy pipe is greater than the outer diameter of the magnesium alloy pipe by 0.5-1.0 mm, and the outer diameter of the inner aluminum alloy pipe is less than the inner diameter of the magnesium alloy pipe by 0.5-1.0 mm.
The invention enables the magnesium pipe and the aluminum pipe to be overlapped together for integral forming, and simultaneously can realize in-situ compounding, thereby not only saving the previous process for preparing the aluminum alloy coated magnesium alloy composite plate, reducing the cost and improving the efficiency, but also avoiding the interface layer damage caused by the welding of the coiled pipe, and finally obtaining the aluminum alloy coated magnesium alloy pipe with continuous structure, uniform performance, good interface bonding performance and good corrosion resistance.
The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. The solid particle medium forming device for the aluminum-clad magnesium composite pipe fitting is characterized by comprising a workbench, a die, an induction heating coil and a hydraulic system;
the workbench is provided with a mold, the mold comprises a mold sleeve and a mold core, the mold core is detachably embedded in the mold sleeve, the mold core is internally provided with a thermocouple, the mold core comprises two symmetrical halves, and a hollow mold cavity is arranged between the two halves of the mold core; the top of the die is provided with an upper gland, the bottom of the die is provided with a lower gland, the bottom of the lower gland is connected with a workbench, clamping bosses are arranged at the centers of the upper gland and the lower gland respectively, a through hole is arranged at the center of each clamping boss, an upper punch is penetrated in the through hole of the upper gland, a lower punch is movably penetrated in the through hole of the lower gland, and the upper punch and the lower punch are both connected with a hydraulic system; the upper gland and the lower gland are clamped in the die cavity through clamping bosses, water cooling pipes are arranged in the upper gland and the lower gland, and the water cooling pipes are connected with a water cooling machine;
the die is characterized in that an induction heating coil is arranged on the outer ring of the die and connected with an induction heating power supply.
2. The forming device for the solid particle medium of the aluminum-clad magnesium composite pipe fitting according to claim 1, wherein the hydraulic system comprises a hydraulic cylinder, a hydraulic frame and an ejection cylinder, the hydraulic frame is arranged on a workbench, a hydraulic machine slide block is arranged on the upper portion of the hydraulic frame in a penetrating manner, a hydraulic machine upper cross beam is arranged on the top of the hydraulic frame, the hydraulic cylinder is arranged in the middle of the hydraulic machine upper cross beam, the hydraulic cylinder bottom is connected with a hydraulic machine slide block, a die holder is arranged on the hydraulic machine slide block bottom, a spring is arranged between the die holder and an upper gland, and an upper punch is connected; the bottom of the workbench is provided with a jacking cylinder, and the jacking cylinder is connected with the lower punch; the hydraulic cylinder and the ejection cylinder are connected with a hydraulic pump station, and the hydraulic pump station is controlled by a control console.
3. A method for forming solid particle media for aluminum-clad magnesium composite pipe fittings by using the device of any one of claims 1 or 2, which is characterized by comprising the following steps:
firstly, preparing a magnesium alloy pipe, an outer aluminum alloy pipe and an inner aluminum alloy pipe, and cutting the magnesium alloy pipe, the outer aluminum alloy pipe and the inner aluminum alloy pipe to be equal in length;
secondly, performing surface treatment on the cut magnesium alloy and aluminum alloy pipe to remove oxide skins on the inner side and the outer side of the magnesium alloy and aluminum alloy pipe;
thirdly, the lower press cover is arranged on a workbench of the hydraulic press and is aligned with the lower punch;
step four, the two split mold cores are closed and then placed into a mold sleeve; placing the mold core and the mold sleeve on a lower gland and positioning the mold core and the mold sleeve through a clamping boss of the lower gland, respectively sleeving an embedded aluminum alloy pipe and an outer sleeved aluminum alloy pipe into the inner side and the outer side of the magnesium alloy pipe to form a laminated pipe, and placing the laminated pipe in the mold core; filling solid particles with the volume of 0.6-0.8 times of that of the die cavity into the die cavity as a pressure transmission medium; placing the upper gland on the mold core and the mold sleeve and positioning the upper gland and the mold core;
step five, adjusting the induction heating coil to be sleeved outside the die sleeve, adjusting the positions of the upper punch and the lower punch to enable the upper punch and the lower punch to be in contact with solid medium particles but not generate pressure, and enabling a spring fixed on the die holder to apply pressure to the upper pressing plate;
step six, heating the die and the blank to a forming temperature T1, and enabling the upper punch and the lower punch to simultaneously apply pressure P to the solid particle medium respectively0And the laminated tube is subjected to primary plastic deformation, the plastic deformation degree is controlled by the displacement after the upper punch and the lower punch contact the solid particle medium, and the feeding displacement of the upper punch and the lower punch is as follows: s = V/2L, wherein S is the feeding displacement of the lower punch, V is the bulging amount of the pipe fitting, and L is the cross-sectional area of the punch;
step seven, connecting the formed part and the solid particle medium at a connecting temperature T1Pressure receiving force P1And in time t, realizing diffusion connection among the multilayer pipes;
and step eight, opening the two-petal mold core, and taking the part to finish the preparation of the multilayer pipe fitting of the aluminum alloy pipe coated with the magnesium alloy.
4. The method for forming the solid particle medium of the aluminum-clad magnesium composite pipe fitting according to claim 3, wherein the thickness of the magnesium alloy pipe is less than 5mm, the thickness of the outer aluminum alloy pipe and the thickness of the inner aluminum alloy pipe are less than 3mm, the inner diameter of the outer aluminum alloy pipe is greater than the outer diameter of the magnesium alloy pipe by 0.5-1.0 mm, and the outer diameter of the inner aluminum alloy pipe is less than the inner diameter of the magnesium alloy pipe by 0.5-1.0 mm.
5. The method for forming the solid particle medium of the aluminum-clad magnesium composite pipe fitting according to claim 3, wherein the pressure transfer medium is quartz sand.
6. The method as claimed in claim 3, wherein the solder resist is coated on the upper and lower surfaces of the laminated tube in the fourth step, which are in contact with the die, and the solder resist is also coated on the upper punch, the lower punch and the inner wall of the die cavity.
7. The method as claimed in claim 6, wherein the solder resist is boron nitride.
CN201911275807.5A 2019-12-12 2019-12-12 Solid particle medium forming method and device for aluminum-clad magnesium composite pipe fitting Pending CN110976671A (en)

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CN201911275807.5A CN110976671A (en) 2019-12-12 2019-12-12 Solid particle medium forming method and device for aluminum-clad magnesium composite pipe fitting

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