CN113199132A - Method for manufacturing dissimilar pipe joint by adopting bar stirring friction - Google Patents

Method for manufacturing dissimilar pipe joint by adopting bar stirring friction Download PDF

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Publication number
CN113199132A
CN113199132A CN202110551784.7A CN202110551784A CN113199132A CN 113199132 A CN113199132 A CN 113199132A CN 202110551784 A CN202110551784 A CN 202110551784A CN 113199132 A CN113199132 A CN 113199132A
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China
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stirring rod
stirring
rod
bar
die
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Chinese (zh)
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石磊
田春燕
武传松
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Shandong University
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Shandong University
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    • 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
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
    • 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
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
    • B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
    • 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
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
    • B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
    • B23K20/1255—Tools therefor, e.g. characterised by the shape of the probe
    • 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
    • B23K20/24—Preliminary treatment
    • 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
    • B23K20/26—Auxiliary equipment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

The invention discloses a method for manufacturing a dissimilar pipe joint by adopting bar stirring friction, which adopts the technical scheme that: sequentially placing at least two bars with different materials into a die, wherein the butt ends of the adjacent bars are matched; the stirring rod finishes the stirring friction preparation process by setting the pressing amount, the rotating speed and the pressing speed; under the rotating and stirring action of the stirring rod, the surrounding materials generate plastic flow, and meanwhile, under the action of the stirring rod, friction and plastic deformation occur among the materials, so that connection is realized; the material which generates plastic flow is limited in an annular cavity formed by the die and the stirring rod to form a structural member; and taking out the structural part in the die, and carrying out post-treatment to obtain the heterogeneous pipe joint. The invention can effectively avoid the problems of low welding efficiency, low mechanical property of joints, unstable size and the like when dissimilar thin-wall pipes are directly welded, thereby ensuring that dissimilar thin-wall tubular structures are stably connected and improving the service performance.

Description

Method for manufacturing dissimilar pipe joint by adopting bar stirring friction
Technical Field
The invention relates to the field of friction stir welding of dissimilar materials, in particular to a method for manufacturing a dissimilar pipe joint by adopting bar friction stir welding.
Background
In products in various fields, various pipes are often used as channels for conveying system media. Different pipes need to be used for different pipe fittings, and in the practical application of the pipes, because the length of the pipes is limited, a plurality of pipes are generally needed to be connected for use. The connecting forms of the pipe fittings are various and mainly divided into two types of additional connecting structural components and direct connection. The former passes through the sealed mode of fastening of sealing washer to be connected, though the installation is convenient, can dismantle, but joint strength is lower, and stability is relatively poor, and applicable pipe diameter scope is narrower, and service life receives the restriction of sealing washer. Meanwhile, the joint usually has a structure protrusion, which causes space limitation in the assembly of other structural members of the instrument equipment and also causes problems of poor cleanliness and the like. The pipe fitting is directly connected by adopting a welding technology, so that the jointless connection can be realized, the application range is wide, the joint strength at the joint is high, and the special advantages are realized.
With the continuous development of the industry in China and the continuous progress of the engineering technology, the requirements on the safety performance, energy conservation and environmental protection of products are continuously improved. In order to meet the use requirements of product equipment and realize the lightweight structure, multiple materials are usually required to be mixed for use, and the advantages of the materials in the aspects of mechanical property, process property, economy and the like are comprehensively exerted. Therefore, two adjacent pipes to be connected may be made of different materials, and the application of the connection of different pipes is more and more common.
Due to the large difference of physical properties, chemical properties, tissue components and the like of different materials, the welding of different materials is more complicated and difficult than the welding of the same materials, and the requirements on connecting technology and connecting devices are higher. Welding defects such as air holes, slag inclusion, welding impermeability and the like are easy to occur by adopting a fusion welding method, and waste products are easy to occur. The welding efficiency of diffusion welding and brazing is low, and the requirements on the size and the shape of a workpiece are strict. The rotary friction welding joint has good quality, but when the thin-wall pipe fitting is connected, the pipe fitting is easy to deform or even bend under the action of jacking and pressing force, and the performance of the joint is influenced. As a novel solid phase connection technology, friction stir welding effectively solves the problem of welding light alloy materials, can realize high-efficiency and high-quality connection of light alloy materials such as aluminum, magnesium, copper and the like, and has unique advantages in connection of dissimilar materials. During welding, under the action of friction heat and plastic deformation heat, metal on two sides of a welding seam is softened, plastic flow is generated under the driving of the stirring pin, and a welding joint is formed through the stirring of the stirring pin and the forging and pressing action of the shaft shoulder. In the welding process, the material is not melted, the welding seam has no defects of air holes, slag inclusion, cracks and the like, the operation is simple, and the automation is convenient to realize. However, in the welding process, the workpiece to be welded bears a large upsetting force in the direction of the main shaft, and has certain shape requirements on the workpiece to be welded, and the realization of the friction stir welding of the pipe fitting, particularly the thin-wall pipe fitting, has technical difficulties.
The prior art discloses a novel device for friction stir welding of heterogeneous tubular structures, which mainly comprises a tray, a tray shaft, a bearing, a stirring head and a circular frame for fixing the stirring head, wherein the worktable and the stirring head rotate in opposite directions to form higher heat to realize superposition welding of two connecting pipes, so that the novel device is suitable for friction stir welding of lightweight alloy pipe joints, and solves the problems of low welding efficiency and easy occurrence of waste products of the existing pipes with different pipe diameters. However, when the method is used for welding the pipes with the same pipe diameter, the requirements for fixing the pipes and positioning the stirring head are higher. On the other hand, when the thin-walled pipe is connected, the pressing amount of the stirring pin is difficult to control, the problems of unconnected joints, collapse and deformation and the like easily occur at the joints, and the quality of the joints is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for manufacturing a dissimilar pipe joint by adopting bar material stirring friction, which can effectively avoid the problems of low welding efficiency, low mechanical property of the joint, unstable size and the like when dissimilar thin-walled pipes are directly welded, thereby ensuring that the dissimilar thin-walled tubular structures are stably connected and improving the service performance.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the embodiment of the invention provides a method for manufacturing a dissimilar pipe joint by adopting bar stirring friction, which comprises the following steps:
sequentially placing at least two bars with different materials into a die, wherein the butt ends of the adjacent bars are matched;
the stirring rod finishes the stirring friction preparation process by setting the pressing amount, the rotating speed and the pressing speed; under the rotating and stirring action of the stirring rod, the surrounding materials generate plastic flow, and the materials generating the plastic flow are limited in an annular cavity formed by the die and the stirring rod to form a structural member;
and taking out the structural part in the die, and carrying out post-treatment to obtain the heterogeneous pipe joint.
As a further implementation, the stirring rod cannot directly contact the die during the pressing process; the downward pressing amount of the stirring rod is larger than the length of a single bar and smaller than the sum of the lengths of all the butt ends of the bars after the butt ends are matched, so that the stirring friction preparation process is finished before the stirring rod is about to contact the lower surface of the bar positioned on the lower side.
As a further implementation mode, the stirring rod rotates at a high speed and is slowly inserted into the bar, the stirring rod and the bar generate heat through friction, and the generated friction heat enables the materials around the stirring rod to be in a thermoplastic state.
As a further implementation, the material of the pipe formed between the die and the stirring rod is changed along with the continuous pressing of the stirring rod; the material of the upper pipe fitting is consistent with the material of the bar positioned on the upper side, the middle pipe fitting is a required heterogeneous pipe joint, and the material of the lower pipe fitting is consistent with the material of the bar positioned on the lower side.
As a further implementation, the excess bottom surface of the structural member is removed to obtain a tubular structure, and the tubular structure is further trimmed to make the two end surfaces of the pipe fitting smooth, thereby obtaining the dissimilar pipe joint.
As a further implementation, it is desirable to retain the single material tube portions at both ends of the tube structure when removing the excess portions of the structure and finishing the ends of the tube structure.
As a further implementation, the stir bar diameter is smaller than the rod diameter.
As a further implementation mode, the diameters of the rods are the same, and the rods are arranged from top to bottom in the order of the materials from soft to hard.
As a further realization, adjacent bars are fitted with a groove structure by means of mutually fitting projections.
As a further implementation mode, the central axis of the inner cavity of the die, the central axis of the bar and the central axis of the stirring rod are superposed.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
(1) according to one or more embodiments of the invention, bar material stirring friction is adopted to manufacture the dissimilar pipe joint, so that direct friction welding of thin-wall dissimilar pipe fittings is avoided, the risk of deformation and even bending of the thin-wall pipe fittings is reduced, and the rejection rate is reduced; the mechanical property at the transition pipe joint is ensured to be excellent, and the service life of the connecting part of the tubular structure is prolonged; the size precision of the joint of the thin-wall pipe is convenient to control, and the size stability of the joint of the tubular structure is improved.
(2) The rod-shaped material required by one or more embodiments of the invention has simple structural shape, can be obtained by adopting the modes of mechanical processing, die forging and the like, and saves the processing cost; meanwhile, the friction stir process is simple to operate, automation is convenient to realize, and the production efficiency is improved.
(3) According to one or more embodiments of the invention, the existing friction stir welding equipment does not need to be greatly modified, the required die has a simple structure, and the rapid industrial application is easy to realize.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow diagram in accordance with one or more embodiments of the invention;
fig. 2(a) -2 (e) are schematic illustrations of a manufacturing process of the present invention according to one or more embodiments.
Wherein, 1-a stirring rod; 2-a mould; 3-a first bar; 4-a second bar; 5-a structural member; 6-dissimilar tube joint.
Detailed Description
The first embodiment is as follows:
the embodiment provides a method for manufacturing a dissimilar pipe joint by using bar material friction stir welding, as shown in fig. 1, comprising the following steps:
putting a plurality of bars made of different materials into the die 2 in sequence, wherein the butt ends of the bars are matched;
the stirring rod 1 finishes the stirring friction preparation process at the set pressing amount, the set rotating speed and the set pressing speed; under the rotating and stirring action of the stirring rod 1, the material around the stirring rod 1 generates plastic flow, and the material generating the plastic flow is limited in an annular cavity formed by the mold 2 and the stirring rod 1 to form a structural part 5;
and (5) taking out the structural part 5 in the die 2, and carrying out post-treatment to obtain the dissimilar pipe joint 6.
In this embodiment, the bar may be two or more metal or nonmetal materials, such as aluminum alloy, copper alloy, magnesium alloy, titanium alloy, composite material, polymer material, etc.; the number of the bars can be determined according to the requirements of actual pipe joints. This example is specifically described in terms of two types of bars:
specifically, the method comprises the following steps:
the method comprises the following steps: preparation before the process:
determining the material of the mould 2; in this embodiment, a cylindrical mold is used, which has an open top and a cavity inside. Two bars made of different materials, namely a first bar 3 and a second bar 4, are adopted, and the ends, close to each other, of the first bar and the second bar form a butt joint end.
In an embodiment, first rod 3 and second rod 4 interface with the groove using a mating boss. The shape and size of the lug boss and the groove are consistent, so that the stable relative position relationship of the two materials is ensured in the friction stir welding process, and meanwhile, a contact area of the dissimilar materials is provided, and the composite plastic flow and welding of the dissimilar materials are realized.
In this embodiment, the boss and the groove may be spherical or other shapes; the height of the lug boss or the groove is 5-50% of the length of the cylindrical part of the rod-shaped material, and the outer diameter of the lug boss or the groove is 50-80% of the diameter of the rod.
Further, the first rod 3 and the second rod 4 have the same diameter, and when placed in the die 2, the generally relatively soft material is located above and the harder material is located below. In this embodiment, as shown in fig. 2(a), the second bar 4 with the groove is located below and directly contacts the bottom surface of the inner cavity of the die 2, and one side of the groove faces upwards; first rod 3 with the boss is located the top, and the boss one side is down, and in the recess of embedding second rod 4, two rod shapes agree with, guarantee that its contact surface closely laminates, avoid taking place to remove at the friction stir in-process.
Further, in order to ensure that the two materials can be fully contacted, the pressing amount of the stirring rod 1 should be greater than the length of a single rod, and meanwhile, in order to avoid damaging the die, the pressing amount of the stirring rod 1 should be less than the sum of the lengths of the two rods after the butt ends are engaged. The end of the stirring rod 1 can be in any shape such as plane, spherical surface, boss, groove, etc.
It should be understood that the selection of the different rod-shaped materials is based on the different pipes to be connected, and the material of the rod-shaped materials should be consistent with the material of the different pipes to be connected.
Further, the inner diameter phi of the cavity of the mold 2 is determined1Cavity depth h1And die wall thickness h2. Determining the material and wall thickness h of the dissimilar pipe fitting to be connected3And selecting a proper diameter phi of the stirring rod 12. Determining the dimensions of a heterogeneous rod-shaped material (rod material), including the diameter phi of the rod material3And length L of bar1Determining the height (depth) L of the boss (groove) of the bar2And the major diameter phi of the bar boss4Small diameter of sum phi5. Determining the amount of depression h4The rotational speed ω of the stirring rod 1 and the pressing speed v are determined.
In this embodiment, the rotational speed ω of the stirring rod is selected within a range of 50 to 10000rpm, and the pressing speed v may be selected within a range of 0.1 to 100 mm/s.
And then, removing dust and oil stains on the surface of the dissimilar rod-shaped material, and ensuring the cleanness of the contact surface of the dissimilar material. The two kinds of rods are put into the die 2 in sequence according to the shape fit of the lug boss and the groove. The inner diameter of the die 2 determines the outer diameter of the transition pipe joint (the dissimilar pipe joint 6), and for this purpose, the appropriate size of the die 2 should be selected according to the pipe to be connected later.
The diameter size of the stirring rod 1 determines the inner diameter of the transition pipe joint, the diameter size of the stirring rod 1 should be determined according to the inner diameter of a subsequent heterogeneous pipe to be connected, and the diameter size of the stirring rod should be consistent with the inner diameter of the subsequent connected pipe.
Further, the diameter of the stirring rod 1 should be smaller than that of the rod material so that the stirring rod is screwed into a proper position of the rod-shaped materials to be connected during the welding process.
It should be noted that the central axis of the cavity of the mold 2, the central axis of the rod-like material, and the central axis of the stirring rod 1 should coincide.
The stirring friction method of the embodiment can be used for manufacturing the dissimilar transition pipe joint with the pipe wall thickness of 0.2-20 mm. The raw materials of the transition pipe joint can be the same or different; if the two types of pipe joints are the same, preparing the same type of pipe joint; if different, the different pipe joints are prepared.
Step two: the friction stir welding preparation process comprises the following steps:
fixing the die 2 and the bar, confirming the relative positions of the die 2, the bar and the stirring rod 1, and completing the stirring friction preparation process according to the pre-selected pressing amount, the rotating speed of the stirring rod 1 and the pressing speed.
It should be noted that the stirring rod 1 cannot directly contact the mold during the pressing process, and the pressing amount is smaller than the total length of the two rod-shaped materials, so as to ensure that the friction stir preparation process is finished just before the stirring rod 1 contacts the lower surface of the rod-shaped material with the groove. The stirring rod 1 applies certain axial pressure to the rod-shaped materials to enable the joint surfaces of the two rod-shaped materials to be tightly combined together.
Further, as shown in fig. 2(b), the stirring rod 1 is rotated at a high speed and slowly inserted into the interior of the rod, and the stirring rod 1 and the rod generate heat by friction, and the generated friction heat brings the metal around the stirring rod 1 into a thermoplastic state. Under the rotating stirring action of the stirring rod 1, the material around the stirring rod 1 generates plastic flow. The material that flows plastically is confined in the annular cavity formed by the die 3 and the stirring rod 1, forming the structural part 5 (tube).
Along with stirring rod 1 constantly pushes down, the material of the pipe fitting that forms between mould 2 and stirring rod 1 also changes thereupon, and the top pipe fitting material is unanimous with the material of first rod 3, and middle pipe fitting is required heterogeneous material transition coupling (heterogeneous coupling 6), and the material of the bottom pipe fitting is then unanimous with the material of second rod 4.
Step three: and (3) post-treatment:
after the friction stir process is completed, as shown in fig. 2(c), the stirring rod 1 is withdrawn, and then the mold is removed to form the structural member 5 as shown in fig. 2 (d). Removing the excessive bottom surface of the structural member to obtain a tubular structure, and further trimming to make the two end surfaces of the pipe fitting smooth, thereby obtaining the dissimilar material transition pipe joint shown in fig. 2 (e).
In this embodiment, material removing processing methods such as mechanical processing, electrical discharge cutting, flame cutting, and the like may be employed.
It should be noted that care must be taken to retain the single material tube portions at both ends of the prepared structural member when removing the excess portion and trimming the end faces of the tube structure. So as to convert the dissimilar pipe connection into the pipe connection of the same material, and exert the effect of the dissimilar material transition pipe joint.
Example two:
in this embodiment, the method described in the first embodiment is adopted to manufacture an aluminum/copper dissimilar alloy transition pipe joint with an outer diameter of 20mm, an inner diameter of 14mm, and a wall thickness of 3mm, where the two materials are respectively T2 copper alloy and 1050 aluminum alloy, and the method specifically includes the following steps:
the method comprises the following steps: preparation before the process:
selecting stainless steel mold, and determining the inner diameter phi of the cavity1Is 20mm and the cavity depth h140mm, die wall thickness h2Is 5 mm. The materials of the different pipe fittings to be connected are T2 copper alloy and 1050 aluminum alloy respectively, and the wall thickness h3Is 3mm, the diameter phi of the stirring rod2Is 14 mm.
Determining the diameter phi of the rod-shaped material3Is 19mm and the material length L19mm, determining the height (depth) L of the boss (groove) of the bar22mm, the major diameter phi of the bar boss416mm, small diameter phi5Is 12 mm; correspondingly, the major diameter in the groove is 16mm, and the minor diameter is 12 mm. Determining the amount of depression h4The rotating speed omega of the stirring rod is 600rpm and the pressing speed is determined to be 12mmv is 0.5 mm/s.
And then, removing dust and oil stains on the surface of the dissimilar rod-shaped material, and ensuring the cleanness of the contact surface of the dissimilar material. And (3) fitting the two rod-shaped materials into the groove according to the shape of the boss, and sequentially placing the two rod-shaped materials into a die.
Step two: and (3) stirring and rubbing:
and fixing the die and the bar, and finishing the stirring friction process according to the preset pressing amount, the rotating speed of the stirring bar and the pressing speed after confirming that the relative positions of the die, the bar and the stirring bar are finished.
Step three: and (3) post-treatment:
after the friction stir process is complete, the stir bar is withdrawn from the bar and the new structure newly formed in the mold is then removed. And removing the redundant lower bottom surface in the new structural member to obtain a tubular structure, and further finishing to enable two end surfaces of the pipe fitting to be flat and smooth, thereby obtaining the dissimilar material transition pipe joint. Machining and the like can be adopted.
Example three:
in this embodiment, the method described in the first embodiment is adopted, and the aluminum/magnesium dissimilar alloy transition pipe joint with a pipe wall thickness of 2mm, an outer diameter of 30mm and an inner diameter of 26mm is adopted, wherein the two materials are 6061-T6 aluminum alloy and AZ31B-H24 magnesium alloy, and the specific steps are as follows:
the method comprises the following steps: preparation before the process:
selecting stainless steel mold, and determining the inner diameter phi of the cavity1Is 30mm and the cavity depth h160mm, die wall thickness h2Is 5 mm. The materials of the different pipes to be connected are 6061-T6 aluminum alloy and AZ31B-H24 magnesium alloy respectively, and the wall thickness H3Is 2mm, the diameter phi of the stirring rod2Is 26 mm.
Determining the diameter phi of the rod-shaped material3Is 29mm and the material length L19mm, determining the height (depth) L of the boss (groove) of the bar23mm, the major diameter phi of the bar boss427mm, minor diameter phi5Is 24 mm; correspondingly, the major diameter of the groove is 27mm and the minor diameter thereof is 24 mm. Determining the amount of depression h4For 14mm, the rotational speed ω of the stirring rod was determined to be 500rpm, and the pressing speed v was determined to be 0.4 mm/s.
And then, removing dust and oil stains on the surface of the dissimilar rod-shaped material, and ensuring the cleanness of the contact surface of the dissimilar material. And (3) fitting the two rod-shaped materials into the groove according to the shape of the boss, and sequentially placing the two rod-shaped materials into a die.
Step two: and (3) stirring and rubbing:
and fixing the die and the bar, and finishing the stirring friction process according to the preset pressing amount, the rotating speed of the stirring bar and the pressing speed after confirming that the relative positions of the die, the bar and the stirring bar are finished.
Step three: and (3) post-treatment:
after the friction stir process is complete, the stir bar is withdrawn from the bar and the new structure newly formed in the mold is then removed. And removing the redundant lower bottom surface in the new structural member to obtain a tubular structure, and further finishing to enable two end surfaces of the pipe fitting to be flat and smooth, thereby obtaining the dissimilar material transition pipe joint. Machining and the like can be adopted.
Example four:
in this embodiment, the method described in the first embodiment is adopted, and the aluminum/titanium dissimilar alloy transition pipe joint with a pipe wall thickness of 3mm, an inner diameter of 9mm, and an outer diameter of 15mm is adopted, wherein the two materials are TC4 titanium alloy and 2a14 aluminum alloy, and the method is manufactured by using bar material friction stir, and specifically includes the following steps:
the method comprises the following steps: preparation before the process:
selecting stainless steel mold, and determining the inner diameter phi of the cavity1Is 15mm and the cavity depth h140mm, die wall thickness h2Is 5 mm. The materials of the different pipe fittings to be connected are TC4 titanium alloy and 2A14 aluminum alloy respectively, and the wall thickness h is3Is 3mm, the diameter of the stirring rod is phi2Is 9 mm.
Determining the diameter phi of the rod-shaped material3Is 14mm and a material length L1The height (depth) L of a bar boss (groove) is determined to be 10mm22mm, the major diameter phi of the bar boss412mm, minor diameter phi5Is 8 mm; correspondingly, the major diameter of the groove is 12mm, and the minor diameter is 8 mm. Determining the amount of depression h4The rotation speed omega of the stirring rod is 700rpm and the pressing is performed for 16mmThe velocity v is 0.6 mm/s.
And then, removing dust and oil stains on the surface of the dissimilar rod-shaped material, and ensuring the cleanness of the contact surface of the dissimilar material. And (3) fitting the two rod-shaped materials into the groove according to the shape of the boss, and sequentially placing the two rod-shaped materials into a die.
Step two: and (3) stirring and rubbing:
and fixing the die and the bar, and finishing the stirring friction process according to the preset pressing amount, the rotating speed of the stirring bar and the pressing speed after confirming that the relative positions of the die, the bar and the stirring bar are finished.
Step three: and (3) post-treatment:
after the friction stir process is complete, the stir bar is withdrawn from the bar and the new structure newly formed in the mold is then removed. And removing the redundant lower bottom surface in the new structural member to obtain a tubular structure, and further finishing to enable two end surfaces of the pipe fitting to be flat and smooth, thereby obtaining the dissimilar material transition pipe joint. Machining and the like can be adopted.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A method for manufacturing a dissimilar pipe joint by adopting bar stirring friction is characterized by comprising the following steps:
sequentially placing at least two bars with different materials into a die, wherein the butt ends of the adjacent bars are matched;
the stirring rod finishes the stirring friction preparation process by setting the pressing amount, the rotating speed and the pressing speed; under the rotating and stirring action of the stirring rod, the surrounding materials generate plastic flow, and the materials generating the plastic flow are limited in an annular cavity formed by the die and the stirring rod to form a structural member;
and taking out the structural part in the die, and carrying out post-treatment to obtain the heterogeneous pipe joint.
2. The method for manufacturing dissimilar tubular joints by means of bar friction stir according to claim 1, wherein the stirring rod cannot directly contact the die during the pressing down process; the downward pressing amount of the stirring rod is larger than the length of a single bar and smaller than the sum of the lengths of all the butt ends of the bars after the butt ends are matched, so that the stirring friction preparation process is finished before the stirring rod is about to contact the lower surface of the bar positioned on the lower side.
3. The method of claim 1, wherein the stirring rod is rotated at a high speed and slowly inserted into the rod, and the stirring rod and the rod generate heat due to friction, and the friction heat is generated to make the material around the stirring rod in a thermoplastic state.
4. The method for manufacturing a dissimilar tubular joint by friction stir welding of a bar according to claim 1, wherein the material of the pipe formed between the die and the stirring rod is changed with the continuous pressing of the stirring rod; the material of the upper pipe fitting is consistent with the material of the bar positioned on the upper side, the middle pipe fitting is a required heterogeneous pipe joint, and the material of the lower pipe fitting is consistent with the material of the bar positioned on the lower side.
5. The method for manufacturing a dissimilar tubular joint using bar friction stir according to claim 1 or 4, wherein the lower bottom surface of the structural member is removed to obtain a tubular structure, and the tubular structure is further trimmed to make both end surfaces of the tubular member flat and smooth, thereby obtaining a dissimilar tubular joint.
6. The method of claim 1, wherein the single material pipe sections at both ends of the pipe are retained when removing the excess structural parts and finishing the ends of the pipe structure.
7. The method of claim 1, wherein the diameter of the stirring rod is smaller than the diameter of the rod.
8. The method of claim 1, wherein the diameter of the rods is the same, and the rods are arranged from top to bottom in the order of soft to hard.
9. The method of claim 1 or 8, wherein the adjacent bars are engaged with the groove structure by means of the engaging protrusions.
10. The method of claim 1, wherein the central axis of the mold cavity, the central axis of the rod, and the central axis of the stirring rod coincide.
CN202110551784.7A 2021-05-20 2021-05-20 Method for manufacturing dissimilar pipe joint by adopting bar stirring friction Pending CN113199132A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023087631A1 (en) * 2021-11-22 2023-05-25 西南技术工程研究所 Device and method for friction additive manufacturing of blanks

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101670482A (en) * 2009-09-29 2010-03-17 西安交通大学 Embedded stirring friction spot welding method
US20150240970A1 (en) * 2014-02-24 2015-08-27 Lockheed Martin Corporation Friction stir welded pipes
CN106271028A (en) * 2016-09-07 2017-01-04 东南大学 A kind of agitating friction girth welding connects the method for dissimilar metal
CN110216366A (en) * 2019-06-13 2019-09-10 上海航天设备制造总厂有限公司 Aluminium-alloy pipe circumferential direction friction welding method and device
CN110548986A (en) * 2019-09-09 2019-12-10 山东大学 friction stir welding device and method for dissimilar materials and application
US20210053100A1 (en) * 2013-03-22 2021-02-25 Battelle Memorial Institute Devices and Methods for Performing Shear-Assisted Extrusion and Extrusion Processes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101670482A (en) * 2009-09-29 2010-03-17 西安交通大学 Embedded stirring friction spot welding method
US20210053100A1 (en) * 2013-03-22 2021-02-25 Battelle Memorial Institute Devices and Methods for Performing Shear-Assisted Extrusion and Extrusion Processes
US20150240970A1 (en) * 2014-02-24 2015-08-27 Lockheed Martin Corporation Friction stir welded pipes
CN106271028A (en) * 2016-09-07 2017-01-04 东南大学 A kind of agitating friction girth welding connects the method for dissimilar metal
CN110216366A (en) * 2019-06-13 2019-09-10 上海航天设备制造总厂有限公司 Aluminium-alloy pipe circumferential direction friction welding method and device
CN110548986A (en) * 2019-09-09 2019-12-10 山东大学 friction stir welding device and method for dissimilar materials and application

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DINAHARAN, I，SATHISKUMAR, R，VIJAY, SJ ，MURUGAN, N: "Microstructural Characterization of Pure Copper Tubes Produced by A Novel Method Friction Stir Back Extrusion", 《PROCEDIA MATERIALS SCIENCE》 *
FADI ABU-FARHA: "A preliminary study on the feasibility of friction stir back extrusion", 《SCRIPTA MATERIALIA》 *
MATHEW, N ，DINAHARAN, I，VIJAY, SJ，MURUGAN, N: "Microstructure and Mechanical Characterization of Aluminum Seamless Tubes Produced by Friction Stir Back Extrusion", 《METALLURGY MATERIALS ENGINEERING》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023087631A1 (en) * 2021-11-22 2023-05-25 西南技术工程研究所 Device and method for friction additive manufacturing of blanks

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Application publication date: 20210803