A brazing fixture for a columnar shell type metal wire mesh sandwich component and a manufacturing method thereof

Abstract

The present invention provides a brazing fixture for a columnar shell type metal wire mesh sandwich component and a manufacturing method thereof, including an end cover, a base, a split mandrel, a conical support block, a split pressing block and the base; the split mandrel, the conical support block and the split pressing block are arranged between the end cover and the base; the conical support block is arranged rotationally symmetrically along the central axis of the fixture, the split mandrel is arranged rotationally symmetrically along the central axis of the fixture, and the split pressing block is arranged rotationally symmetrically along the central axis of the fixture; the conical support block, the split mandrel and the split pressing block are arranged axially from inside to outside along the central axis of the fixture; the thickness of the conical support block gradually increases along the direction from the end cover to the base, and the thickness of the split mandrel gradually decreases along the direction from the end cover to the base. By applying the technical solution, a metal wire mesh sandwich columnar shell with excellent properties such as light weight, shock absorption and noise reduction can be obtained, and it can be widely applied to fields such as aviation hot end components.

Description

Technical Field

[0001] The present invention relates to the technical field of welding processing, in particular to a brazing fixture for a columnar shell type metal wire mesh sandwich component and a manufacturing method thereof. Background Art

[0002] The sandwich structural component has excellent mechanical properties such as high specific strength and specific stiffness, and has the advantages of light weight, vibration damping, impact energy absorption, noise reduction, etc., and is very suitable for harsh environments. In recent years, the sandwich structural component has received extensive attention in the field of integrated design and application of functions and structures. However, at present, the research on the metal wire mesh sandwich structural component is very few. The metal wire mesh has high compressive strength, good high temperature resistance, chemical corrosion resistance, and good formability. The metal wire can be woven into meshes with different shapes, densities and specifications according to requirements. Designing the metal wire mesh into a composite material structure can improve its structural stability as a functional component and enhance its comprehensive mechanical properties. The rigid-flexible heterogeneous composite sandwich structure composed of a panel absorbs energy through the elastic deformation of the core layer under load, allows greater deformation and has a wider elastic range, reducing the occurrence and damage of plastic deformation. The metal wire mesh sandwich structure has many excellent properties such as high temperature resistance, good damping performance, energy absorption and buffering vibration damping, and has important application potential in the fields of aerospace, national defense, construction, transportation, etc.

[0003] In the manufacturing of the sandwich structure, the connection processes mainly include two methods: cementing and welding. At present, the most widely used connection process is adhesive bonding. Through adhesive bonding, the connection of heterogeneous materials can be realized without affecting the characteristics of the material itself. The process is simple to process and suitable for mass production. However, due to the poor high temperature resistance, corrosion resistance and aging resistance of the adhesive layer, the interfacial bonding strength is not high, and the application range has great limitations. Welding, as a traditional metal bonding method, is an effective way to realize the connection between the same metal or different metals. Compared with the cementing process, the welding process realizes the metallurgical bonding between the panel and the core. During the welding process, it has the advantages of small deformation and high connection strength. The prepared sandwich structure has high interfacial bonding strength, stable performance and good damping energy dissipation effect. Therefore, compared with the cementing process, the sandwich structural component prepared by the welding process has great advantages in terms of high temperature resistance, anti-aging, etc., and has a wider application range.

[0004] At present, the methods for preparing sandwich structural components by welding mainly include laser welding, diffusion welding and brazing. Since it is difficult to control the energy of the laser beam during the laser welding process, pores of different sizes are easily formed in the panel after welding. The mechanical properties of the material at the diffusion welding weld are much lower than those of the base material. Metallurgical connection is achieved through the molten filler metal, and the interfacial bonding is good. However, most of the welding of the sandwich structure is mainly planar welding, and there are few brazing fixtures for columnar shell sandwich panels, which to a certain extent limits the engineering application of columnar shell sandwich panels.

[0005] The following problems exist in the prior art: 1) The sandwich structure parts prepared by traditional cementing methods have poor high-temperature resistance, corrosion resistance, and anti-aging performance, and are prone to a decrease in material mechanical properties due to face / core debonding; 2) In the sandwich structure parts prepared by existing welding methods, pores of different sizes are likely to form in the face plate after laser welding, and the material mechanical properties at the diffusion welding seam are much lower than those of the base material. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a brazing fixture for a columnar shell type metal wire mesh sandwich part and its manufacturing method. The prepared metal wire mesh sandwich columnar shell part has excellent properties such as light weight, shock absorption, and noise reduction, and can be widely applied in fields such as aviation hot end components.

[0007] To achieve the above purpose, the present invention adopts the following technical scheme: A brazing fixture for a columnar shell type metal wire mesh sandwich part includes an end cover, a split mandrel, a conical support block, a split pressing block, and a base; the split mandrel, the conical support block, and the split pressing block are arranged between the end cover and the base; the conical support block is rotationally symmetrically arranged along the central axis of the fixture, the split mandrel is rotationally symmetrically arranged along the central axis of the fixture, and the split pressing block is rotationally symmetrically arranged along the central axis of the fixture; the conical support block, the split mandrel, and the split pressing block are axially arranged from inside to outside along the central axis of the fixture; the thickness of the conical support block gradually increases along the direction from the end cover to the base, and the thickness of the split mandrel gradually decreases along the direction from the end cover to the base; the conical support block and the split mandrel form a combined component, and the thicknesses of both ends of the combined component facing the end cover and the base are the same.

[0008] In a preferred embodiment, connection threaded holes are opened in the base, the end cover, the split mandrel, the conical support block, and the split pressing block, and the split mandrel and the split pressing block are fixed to the base by bolts, and the end cover is fixed to the conical support block by bolts.

[0009] In a preferred embodiment, both sides of the split pressing block and the split mandrel are arc-shaped surfaces, and the centers of the arc-shaped surfaces are on the central axis of the fixture.

[0010] In a preferred embodiment, an annular space is left in the middle of the split pressing block and the split mandrel.

[0011] In a preferred embodiment, the split mandrel is specifically provided with 4.

[0012] In a preferred embodiment, the split pressing block is provided with 8.

[0013] The present invention also provides a manufacturing method for a brazing fixture of a columnar shell type metal wire mesh sandwich component. Using the above-mentioned brazing fixture of a columnar shell type metal wire mesh sandwich component, first, the split mandrels are assembled into a cylindrical shape and placed above the base. The coiled inner panel is arranged closely against the mandrel. The BNi-2 foil tape, the metal wire mesh core layer, the BNi-2 foil tape, and the outer panel are placed in sequence. After aligning each layer, 8 split pressing blocks are sequentially locked with the split mandrels through bolts. The panel and the core layer are clamped in the reserved space between the split pressing blocks and the split mandrels and pressed tightly with a pre-pressure. When preparing the metal wire mesh core layer, a positive tolerance of 5% is reserved for the thickness. A tapered support block is sleeved inside the split mandrel for internal support, and then the end cover is covered to fix the tooling as a whole. The lifting ring is connected to the split mandrel through threads, and the sample to be welded is lifted and sent into the vacuum brazing furnace. The vacuum degree in the furnace is pumped to 2.0×10 -3 Pa or below, then heating and heat preservation are started, and finally cooling is carried out to obtain the metal wire mesh sandwich columnar shell.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This product provides a brazing device for welding a sandwich columnar shell, which can well realize the connection at the interface of the sandwich panel and is flexible and convenient for loading and unloading. It has the following advantages:

[0016] (1) Adopting a split design, the aligned sandwich materials are sequentially locked with the mandrel through arc pressing blocks by bolts, which can well fix the panel and the core layer in the reserved space between the arc pressing blocks and the mandrel. At the same time, the installation and disassembly are both flexible and convenient.

[0017] (2) In order to overcome the elasticity of the metal wire mesh itself and the internal stress of the coiled panel and ensure good contact between the surface and the core, through the inclined surface fit of the tapered mandrel and the tapered support shaft and the locking of the bolt and the mandrel, a certain pre-pressure is given to press and fix the metal wire mesh core layer and the panel during installation.

[0018] (3) A movable tapered support mandrel is sleeved inside the split mandrel for internal support. The inner diameter can be flexibly adjusted through the inclined surface fit of the taper, which is more suitable for the part size, convenient for loading and unloading, and can also prevent the heat deformation of the metal fixture during high-temperature brazing.

[0019] (4) Threaded holes are respectively provided on the tapered support and the split mandrel core, and the lifting ring can be connected through threads, which is convenient for the transportation and disassembly of the tooling.

[0020] Use: It is used for preparing sandwich columnar shell parts such as metal wire meshes. These parts have excellent properties such as light weight, shock absorption and noise reduction, and can be widely used in fields such as aviation hot end components. Description of the Drawings

[0021] Figure 1Schematic diagram of the overall structure of a brazing fixture for a columnar shell - type metal wire mesh sandwich component in a preferred embodiment of the present invention;

[0022] Figure 2 Schematic cross - sectional view along the central axis direction of a brazing fixture for a columnar shell - type metal wire mesh sandwich component in a preferred embodiment of the present invention. Specific embodiments

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] A manufacturing method of a brazing fixture for a columnar shell - type metal wire mesh sandwich component adopts a brazing fixture for a columnar shell - type metal wire mesh sandwich component. Refer to Figures 1 to 2 , a brazing fixture for a columnar shell - type metal wire mesh sandwich component includes an end cover 1, a split mandrel 2, a tapered support block 3, a split pressing block 4, and a base 5; the split mandrel 2, the tapered support block 3, and the split pressing block 4 are arranged between the end cover 1 and the base 5; the tapered support block 3 is rotationally symmetrically arranged along the central axis of the fixture, the split mandrel 2 is rotationally symmetrically arranged along the central axis of the fixture, and the split pressing block 4 is rotationally symmetrically arranged along the central axis of the fixture; the tapered support block 3, the split mandrel 2, and the split pressing block 4 are arranged axially from the inside to the outside along the central axis of the fixture; the thickness of the tapered support block 3 gradually increases along the direction from the end cover 1 to the base 5, and the thickness of the split mandrel 2 gradually decreases along the direction from the end cover 1 to the base 5; the tapered support block 3 and the split mandrel 2 form a combined component, and the thicknesses of both ends of the combined component facing the end cover 1 and the base 5 are the same.

[0027] The base 5, the end cover 1, the split mandrel 2, the tapered support block 3, and the split pressing block 4 are all provided with connecting threaded holes, and the split mandrel 2 and the split pressing block 4 are fixed to the base 5 by bolts 6, and the end cover 1 is fixed to the tapered support block 3 by bolts 6.

[0028] Both sides of the split pressing block 4 and the split mandrel 2 are arc-shaped surfaces, and the center of the arc-shaped surface is on the central axis of the fixture.

[0029] An annular space is left in the middle of the split pressing block 4 and the split mandrel 2.

[0030] In this embodiment, specifically, 4 split mandrels 2 are provided.

[0031] In this embodiment, 8 split pressing blocks 4 are provided.

[0032] A manufacturing method of a columnar shell type metal wire mesh sandwich part brazing fixture. First, the split mandrels 2 are assembled into a circle and placed above the fixture base 5. The coiled inner panel is arranged closely against the mandrel. Then, the BNi-2 foil tape, the metal wire mesh core layer, the BNi-2 foil tape, and the outer panel are placed in sequence. After aligning each layer, 8 split pressing blocks 4 are used to lock the split mandrels 2 through bolts 6 in sequence. The panel and the core layer are clamped in the reserved space between the split pressing block 4 and the split mandrel 2 and pressed with a certain pre-pressure. To ensure good contact between the elastic core layer, the filler metal, and the panel, a positive tolerance of 5% is reserved for the thickness when preparing the metal wire mesh core layer. To prevent the heat deformation of the metal fixture during high-temperature brazing, a tapered support block 3 is sleeved inside the split mandrel 2 for internal support, and then the end cover 1 is covered to fix the tooling as a whole. The lifting ring is connected to the split mandrel 2 through threads, and the sample to be welded is lifted and sent into the vacuum brazing furnace. When the vacuum degree in the furnace is pumped to below 2.0×10 -3 Pa, heating and heat preservation are started, and finally, it is cooled to obtain the metal wire mesh sandwich columnar shell.

Claims

1. A brazing fixture for a columnar shell type metal wire mesh sandwich component, characterized in that, It includes an end cover, a split mandrel, a conical support block, a split pressing block and a base; the split mandrel, the conical support block and the split pressing block are arranged between the end cover and the base; the conical support block is rotationally symmetrically arranged along the central axis of the fixture, the split mandrel is rotationally symmetrically arranged along the central axis of the fixture, and the split pressing block is rotationally symmetrically arranged along the central axis of the fixture; the conical support block, the split mandrel and the split pressing block are axially arranged in sequence from inside to outside along the central axis of the fixture; the thickness of the conical support block gradually increases along the direction from the end cover to the base, and the thickness of the split mandrel gradually decreases along the direction from the end cover to the base; the conical support block and the split mandrel form an assembly, and the thicknesses of both ends of the assembly facing the end cover and the base are the same; The base, the end cover, the split mandrel, the conical support block and the split pressing block are all provided with connecting threaded holes, and the split mandrel and the split pressing block are fixed to the base by bolts, and the end cover is fixed to the conical support block by bolts; Both sides of the split pressing block and the split mandrel are arc-shaped surfaces, and the centers of the arc-shaped surfaces are on the central axis of the fixture; There is an annular space left in the middle of the split pressing block and the split mandrel.

2. The brazing fixture for a columnar shell type wire mesh sandwich part according to claim 1, wherein Specifically, there are 4 split mandrels.

3. A brazing fixture for a columnar shell type metal wire mesh sandwich member according to claim 1, characterized in that, There are 8 split pressing blocks.

4. A manufacturing method of a brazing fixture for a columnar shell type metal wire mesh sandwich component, characterized in that Adopt a brazing fixture for a columnar shell type metal wire mesh sandwich component described in any one of the above claims 1 to 3. First, assemble the split mandrels into a cylindrical shape and place it above the base. Arrange the coiled inner panel tightly against the mandrel. Then, place the BNi-2 foil tape, the metal wire mesh core layer, the BNi-2 foil tape, and the outer panel in sequence. After aligning each layer, lock 8 split pressing blocks to the split mandrels through bolts in sequence. The panel and the core layer are clamped in the reserved space between the split pressing blocks and the split mandrels and pressed with a pre-pressure. When preparing the metal wire mesh core layer, a positive tolerance of 5% is reserved for the thickness. A conical support block is sleeved inside the split mandrel for internal support, and then the end cover is covered to fix the tooling as a whole. Connect the lifting ring to the split mandrel through threads, lift the sample to be welded and send it into the vacuum brazing furnace. When the vacuum degree in the furnace is pumped to below 2.0×10 -3 Pa, start heating and heat preservation, and finally cool to obtain the columnar shell of the metal wire mesh sandwich.

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