Method of clamping a rotary body structure product in a furnace for brazing

Abstract

A kind of clamping method of rotary structure product brazing in furnace, belong to mechanical manufacturing processing field.This method uses the device mainly by spindle, support ring, support disc is formed, by connecting the product with tooling, realize product brazing in furnace.The assembly method involved in the present application can inhibit the product instability deformation when high-temperature brazing, suitable for rotary structure product brazing in furnace, also can realize the continuous rotation of product brazing, with the characteristics of simple structure, easy operation, can be repeatedly used, can be used for the brazing connection of product in mechanical processing field, forms the brazing structure piece of whole.

Description

Technical Field

[0001] This invention relates to a clamping method for brazing rotating structure products in a furnace, belonging to the field of mechanical manufacturing and processing technology. Background Technology

[0002] Currently, brazing of rotating structural products generally employs a non-rotating method, where the workpiece remains stationary and the product is in a vacuum state to achieve the brazing connection. This method places high demands on equipment; as product size increases, the equipment volume increases significantly. It also results in prolonged vacuum chamber extraction time, lower efficiency, and higher production costs. Furthermore, the direct heating of the product by the equipment leads to spatial and temporal unevenness around the perimeter, easily causing solder blockage during brazing, especially in large structural components. To overcome these shortcomings, a clamping method for brazing rotating structural products is proposed, allowing the product to remain rotated during the brazing process while maintaining a non-vacuum environment, thereby improving brazing efficiency and reducing production costs. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a clamping method for brazing rotating products in a furnace, which realizes rotating brazing of the product, and the brazing environment can be in a non-vacuum environment. The structure is simple, the operation is convenient, and it can be reused multiple times, thereby reducing production costs and improving production efficiency.

[0004] The technical solution of the present invention is: a clamping fixture for brazing rotating structure products in a furnace, comprising a main shaft, a second connecting pipe, a first support ring, a fixing frame, a connecting piece, a second support ring, and a support plate;

[0005] The fixed frame and support plate are fixedly connected to the main shaft and cannot be disassembled;

[0006] The second connecting tube is fixedly connected to the main shaft and the product;

[0007] The first support ring is connected to the product, but not to the mounting bracket;

[0008] The second support ring is fixedly connected to the product connecting piece, but not to the support plate;

[0009] The first connecting tube is connected to the product and the spindle, meeting the requirements for vacuum brazing of the product's inner cavity interlayer.

[0010] The clamping method for brazing a rotary structure product in a furnace, based on the clamping fixture described above, includes:

[0011] S1, use a connecting piece to fix the second support ring to the product;

[0012] S2, load the product into the main shaft and connect the first support ring to the product;

[0013] S3, connects the second connecting pipe to the product and the main shaft for fixation;

[0014] S4, the first connecting tube is connected and fixed to the product and the spindle;

[0015] S5, the product and the spindle are brazed together in the furnace.

[0016] Furthermore, in S1, the materials of the connecting piece and the second support ring should be the same as the outer wall material; the maximum fitting gap between the second support ring and the product should not be greater than 1mm; the thickness of the connecting piece base material is δ2~δ3mm, and it is connected at the thick wall part of the product or the process allowance part; the connecting pieces should be distributed around the perimeter, spaced 150mm~200mm apart, and evenly distributed around the perimeter.

[0017] Furthermore, in S2, the material of the first support ring is the same as that of the product, the assembly gap with the fixing frame is no greater than 0.2mm, and the maximum fitting gap with the product is no greater than 0.5mm; 4 to 6 positions are evenly distributed around the perimeter using argon arc welding.

[0018] Furthermore, in S2, after the product is loaded into the tooling, sufficient axial clearance is ensured between the second support ring and the support plate. The longer the product is axially, the larger the reserved axial clearance is, not less than 50mm. In the circumferential direction, the support plate is reserved with a limit block to restrict the circumferential rotation of the second support ring and ensure that the gap between the two is not greater than 1.0mm.

[0019] Furthermore, in S3, the connecting pipe material is selected as 1Cr18NI9Ti or the same as the product base material.

[0020] Furthermore, the pipe wall thickness δ is not less than 3mm, with 6 evenly distributed around the perimeter, each connected by argon arc welding, resulting in high weld strength.

[0021] Furthermore, in step S4, the material of the first connecting pipe is selected as 1Cr18Ni9Ti.

[0022] Furthermore, the pipe wall thickness δ is not less than 1.0 mm.

[0023] Furthermore, before the product is brazed in the furnace, all connection points are inspected using a negative pressure method with helium mass spectrometry, requiring a leak rate of no more than 1.0 x 10⁻⁶. -6 MPa.

[0024] The advantages of this invention compared to the prior art are:

[0025] (1) The present invention solves the problem of uniform deformation of products during high-temperature brazing by fixing one end and moving the other end.

[0026] (2) The present invention achieves uniform flow of brazing material by rotating the product together with the mounting device during the brazing process, thus solving the problem of clogging;

[0027] (3) The present invention uses a vacuum system pipeline to ensure that the brazing surface is in a vacuum environment throughout the brazing process, thus ensuring the quality of the brazed joint; Attached Figure Description

[0028] Figure 1 Schematic diagram of the mounting fixture structure;

[0029] Figure 2 Product packaging diagram. Detailed Implementation

[0030] To better understand the above technical solutions, the technical solutions of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0031] The following description, in conjunction with the accompanying drawings, provides a more detailed explanation of a method for clamping a rotating structure product in a furnace for brazing, as provided in the embodiments of this application. Specific implementation methods may include (e.g.) Figures 1-2 As shown): Considering the brazing characteristics of rotating body structure products, a product mounting method is selected. The product is brazed by fixing one end to the main shaft and allowing the other end to move freely. During the brazing process, the product rotates to ensure the uniformity of the brazing material flow. At the same time, the vacuum system pipeline ensures that the inner cavity of the product is in a vacuum environment during the brazing process, thus achieving a high-quality connection of the product.

[0032] like Figure 1 The diagram shows a mounting fixture structure used for mounting and supporting products.

[0033] like Figure 2 The diagram shown illustrates the product mounting process, demonstrating the connection between the product and the tooling. The specific assembly process includes the following steps:

[0034] (1) Connection between product and support ring

[0035] The first support ring 4 is connected to the small end (fixed port) of the product by welding, with 4 to 8 intermittent positioning connections around the perimeter; the second support ring 8 is installed into the large end (sliding end) of the product, and the two are connected and fixed by welding with connecting pieces 7, with 18 to 36 evenly distributed fixing points around the perimeter.

[0036] (2) Cardboard products

[0037] The product connected in step 1 is loaded into the spindle of the tooling. The first support ring 4 at the small end is in contact with the support frame 5 but not fixed; the second support ring 8 at the large end is in contact with the support plate 9 but not fixed. At the same time, the second support ring 8 and the support plate 9 are not allowed to be in fixed contact.

[0038] (3) Fix the small end of the product.

[0039] The second connecting pipe 3 is connected to the main shaft in the product and support plate 9 using a welding method. The number of connections and their distribution around the perimeter need to be determined based on the product size and weight, ensuring that the connection at this point is reliable and stable. Generally, there are 4 to 6 connections evenly distributed around the perimeter.

[0040] (4) Connect the vacuum line.

[0041] The first connecting pipe 2 is connected to the vacuum pipeline inlet on the main shaft of the product and support 9 using a welding method, with two locations distributed symmetrically at 180° intervals. The diameter of the first connecting pipe 2 needs to be determined based on the internal cavity dimensions of the product and the vacuum system's evacuation speed. Generally, the pipe diameter is φ10.

[0042] (5) Detection

[0043] The sealing of the vacuum system piping is tested using helium mass spectrometry leak detection or airtightness testing, requiring that the connections be tight and leak-free. Generally, the leak rate for helium mass spectrometry leak detection is no greater than 1.0 x 1.0 x 10⁻⁶. -6 MPa.

[0044] (6) Brazing

[0045] Product 6 and tooling were loaded into the brazing furnace for in-furnace brazing.

[0046] (7) Disassemble and remove the product

[0047] Mechanical cleaning methods are used to cut off the parts where the product and tooling are connected, and the product is removed; at the same time, the connecting parts are ground and cleaned, and the tooling can be reused.

[0048] In the solution provided in this application embodiment, a clamping fixture for brazing a rotating structure product in a furnace includes a main shaft, a second connecting pipe, a first support ring, a fixed frame, a connecting piece, a second support ring, and a support plate; the fixed frame and the support plate are fixedly connected to the main shaft and are not detachable; the second connecting pipe is fixedly connected to the main shaft and the product; the first support ring is connected to the product but not to the fixed frame; the second support ring is fixedly connected to the product by the connecting piece but not to the support plate; the first connecting pipe is connected to the product and the main shaft, satisfying the requirements for vacuum brazing of the inner cavity layer of the product.

[0049] Based on the same inventive concept, a clamping method for brazing a rotary structure product in a furnace, implemented using a clamping fixture for brazing in a furnace, includes:

[0050] S1, use a connecting piece to fix the second support ring to the product;

[0051] S2, load the product into the main shaft and connect the first support ring to the product;

[0052] S3, connects the second connecting pipe to the product and the main shaft for fixation;

[0053] S4, the first connecting tube is connected and fixed to the product and the spindle;

[0054] S5, the product and the spindle are brazed together in the furnace.

[0055] Furthermore, in S1, the materials of the connecting piece and the second support ring should be the same as the outer wall material; the maximum fitting gap between the second support ring and the product should not be greater than 1mm; the thickness of the connecting piece base material is δ2~δ3mm, and it is connected at the thick wall part of the product or the process allowance part; the connecting pieces should be distributed around the perimeter, spaced 150mm~200mm apart, and evenly distributed around the perimeter.

[0056] In one possible implementation, in S2, the material of the first support ring is the same as that of the product, the assembly gap with the fixing frame is no greater than 0.2 mm, and the maximum fitting gap with the product is no greater than 0.5 mm; 4 to 6 positions are evenly distributed around the perimeter using argon arc welding.

[0057] In one possible implementation, in step S2, after the product is loaded into the tooling, a sufficient axial clearance is maintained between the second support ring and the support plate. The longer the product is axially, the larger the reserved axial clearance is, not less than 50mm. In the circumferential direction, the support plate is reserved with a limit block to restrict the circumferential rotation of the second support ring, ensuring that the gap between the two is not greater than 1.0mm.

[0058] Furthermore, in one possible implementation, in S3, the connecting pipe material is selected as 1Cr18NI9Ti or the same as the product base material.

[0059] In one possible implementation, the pipe wall thickness δ is not less than 3mm, with 6 evenly distributed points around the perimeter, each connected by argon arc welding, resulting in a high weld structure strength.

[0060] Furthermore, in one possible implementation, in S4, the material of the first connecting pipe is selected as 1Cr18Ni9Ti.

[0061] In one possible implementation, the pipe wall thickness δ is not less than 1.0 mm.

[0062] In one possible implementation, before the product is brazed in the furnace, all connection points are inspected using helium mass spectrometry with a negative pressure method, requiring a leak rate of no more than 1.0 x 10⁻⁶. -6 MPa.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0064] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0065] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A clamping fixture for brazing rotating structure products in a furnace, characterized in that, It includes a main shaft (1), a second connecting pipe (3), a first support ring (4), a fixing frame (5), a connecting piece (7), a second support ring (8), and a support plate (9); The fixed frame (5) and the support plate (9) are fixedly connected to the main shaft (1) and cannot be disassembled; The second connecting tube (3) is fixedly connected to the main shaft (1) and the product (6); The first support ring (4) is connected to the product, but not to the fixing frame (5); The second support ring (8) is fixedly connected to the product (6) by a connecting piece (7), but not to the support plate (9); The first connecting pipe (2) is connected to the product (6) and the main shaft (1) to meet the requirements of vacuum brazing of the inner cavity of the product (6); The materials of the connecting piece (7) and the second support ring (8) should be the same as the outer wall material; the maximum fitting gap between the second support ring (8) and the product (6) should not be greater than 1mm; the thickness of the base material of the connecting piece (7) is δ2~δ3mm, and it is connected to the thick wall part or process allowance part of the product (6); the connecting pieces (7) should be distributed around the perimeter, with a spacing of 150mm~200mm, and evenly distributed around the perimeter; The material of the first support ring (4) is the same as that of the product (6), the assembly gap with the fixing frame (5) is no more than 0.2mm, and the maximum fitting gap with the product (6) is no more than 0.5mm; 4 to 6 positioning points are evenly distributed around the perimeter using argon arc welding. After the product (6) is installed into the tooling, there is a sufficient axial gap between the second support ring (8) and the support plate (9). The longer the product (6) is axially, the larger the reserved axial gap is, not less than 50mm. In the circumferential direction, the support plate (9) is reserved with a limit block to restrict the circumferential rotation of the second support ring (8) and ensure that the gap between the two is not greater than 1.0mm. The pipe wall thickness δ is not less than 3mm, with 6 evenly distributed around the perimeter. Each connection is made by argon arc welding, resulting in a high weld strength.

2. The clamping method for brazing a rotary structure product in a furnace using a clamping fixture as described in claim 1, characterized in that, include: S1, the second support ring (8) and the product (6) are fixedly connected by the connecting piece (7); S2, insert the product (6) into the main shaft (1) and connect the first support ring (4) to the product (6); S3, connect the second connecting pipe (3) to the product (6) and the main shaft (1) and fix them together; S4, the first connecting pipe (2) is connected and fixed to the product (6) and the main shaft (1); S5, the product (6) and the spindle (1) are brazed together in the furnace; In S1, the materials of the connecting piece (7) and the second support ring (8) should be the same as the outer wall material; the maximum fitting gap between the second support ring (8) and the product (6) should not be greater than 1mm; the thickness of the base material of the connecting piece (7) is δ2~δ3mm, and it is connected to the thick wall part or process allowance part of the product (6); the connecting pieces (7) should be distributed around the perimeter, with a spacing of 150mm~200mm, and evenly distributed around the perimeter; In S2, the material of the first support ring (4) is the same as that of the product (6), the assembly gap with the fixing frame (5) is no more than 0.2mm, and the maximum fitting gap with the product (6) is no more than 0.5mm; 4 to 6 positions are evenly distributed around the perimeter using argon arc welding. In S2, after the product (6) is installed into the tooling, there is a sufficient axial gap between the second support ring (8) and the support plate (9). The longer the product (6) is axially, the larger the reserved axial gap is, not less than 50mm. In the circumferential direction, the support plate (9) is reserved with a limit block to restrict the circumferential rotation of the second support ring (8) and ensure that the gap between the two is not greater than 1.0mm. The pipe wall thickness δ is not less than 3mm, with 6 evenly distributed around the perimeter. Each connection is made by argon arc welding, resulting in a high weld strength.

3. The clamping method for brazing a rotating structure product in a furnace according to claim 2, characterized in that, In S3, the connecting pipe material is selected as 1Cr18NI9Ti or the same as the product base material.

4. The clamping method for brazing a rotating structure product in a furnace according to claim 2, characterized in that, In S4, the material of the first connecting pipe (2) is selected as 1Cr18NI9Ti.

5. The clamping method for brazing a rotating structure product in a furnace according to claim 4, characterized in that, The wall thickness δ of the pipe shall not be less than 1.0 mm.

6. The clamping method for brazing a rotating structure product in a furnace according to claim 2, characterized in that, Before product (6) is brazed in the furnace, all connection parts are checked by helium mass spectrometry using the negative pressure method, and the leakage rate is required to be no greater than 1.0 x 10⁻⁶. - 6 MPa.

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