A brazing fixture for large honeycomb parts with a split structure

Abstract

This utility model discloses a brazing fixture for large honeycomb parts with a split structure, relating to the field of brazing technology for large honeycomb parts. It includes a lower mold, with an upper mold assembly above the lower mold. The lower mold has concave cavities extending through both ends. A punch is located on the lower surface of the upper mold assembly corresponding to the concave cavity, and the punch mates with the concave cavity. Connecting bolt grooves are provided on the upper surface of the lower mold along the outer edges of both sides of the concave cavity. Connecting grooves are provided on the lower surface of the upper mold assembly along the outer edges of both sides of the punch, corresponding to the connecting bolt grooves. A first process groove is provided on one side of the lower surface of the upper mold assembly, and a second process groove is provided on the other side. A process boss is provided on the lower surface of the upper mold assembly inside the second process groove. The overall structure is simple, easy to install and disassemble, and improves the production efficiency and yield of honeycomb brazed parts.

Description

Technical Field

[0001] This utility model relates to the field of brazing technology for large honeycomb parts, specifically to a brazing fixture for large honeycomb parts with a split structure. Background Technology

[0002] Metal honeycomb structure is a thin-walled polygonal structure with a material wall thickness typically less than 0.1 mm and a cell side length typically less than 10 mm. This structure exhibits high strength along the cell axis. Using the metal honeycomb structure as the core layer, upper and lower skins are brazed to both sides of the honeycomb to form honeycomb parts. These parts offer advantages such as light weight, high rigidity, high strength, and good sound and heat insulation, making them widely used in the aerospace field.

[0003] In the brazing production of honeycomb components, the honeycomb core layer needs to be accurately positioned and placed between the upper and lower skins using brazing fixtures. After secure clamping, the entire assembly is placed into the vacuum brazing equipment. The equipment is then started, and the processes of vacuuming, heating, brazing, cooling, and unloading are completed according to the workflow. Problems encountered in production include inaccurate part positioning due to thermal deformation, uneven heating, low welding rate of the upper and lower skins, and low part qualification rate. Furthermore, with the development of the aerospace industry, the demand for large honeycomb structure parts is increasing, making it an urgent issue to improve the production efficiency and qualification rate of brazed honeycomb parts. Utility Model Content

[0004] The purpose of this utility model is to provide a brazing fixture for large honeycomb parts with a split structure, in order to solve the problems mentioned in the background art that exist in the production process, such as inaccurate part positioning, uneven heating, low welding rate of upper and lower skins, and low part qualification rate due to thermal deformation. Moreover, with the development of the aerospace industry, the demand for large honeycomb structure parts is increasing, and improving the production efficiency and qualification rate of honeycomb brazed parts is also an urgent problem to be solved.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a brazing fixture for a large honeycomb part with a split structure, comprising a lower mold, an upper mold assembly above the lower mold, and concave cavities penetrating through both ends of the lower mold. A punch body is provided on the lower surface of the upper mold assembly at a position corresponding to the concave cavity, the punch body cooperating with the concave cavity. A connecting bolt groove is provided on the upper surface of the lower mold and at the outer edges on both sides of the concave cavity. A connecting groove is provided on the lower surface of the upper mold assembly and at the outer edges on both sides of the punch body. The connecting groove is correspondingly arranged with the connecting bolt groove. A first process groove is provided on one side of the lower surface of the upper mold assembly, and a second process groove is provided on the other side of the lower surface of the upper mold assembly. A process boss is provided on the lower surface of the upper mold assembly inside the second process groove.

[0006] Preferably, the upper module assembly includes an upper mold No. 1, an upper mold No. 2, an upper mold No. 3, and an upper mold No. 4. Limiting holes are provided on both sides between the upper mold No. 1, the upper mold No. 2, the upper mold No. 3, and the upper mold No. 4. The upper mold No. 1, the upper mold No. 2, the upper mold No. 3, and the upper mold No. 4 are connected to each other by interlocking with the limiting holes.

[0007] Preferably, process grooves are provided at the lower interior of the lower mold and at the upper interior of the upper mold assembly, reinforcing ribs are provided between the process grooves, weight-reducing holes are provided on the reinforcing ribs inside the lower mold, and weight-reducing grooves are provided on the front and rear side walls of the lower mold.

[0008] Preferably, pin holes are provided at the front and rear outer edges of the lower mold and at the front and rear outer edges of the upper mold assembly.

[0009] Preferably, both the outer edge of the concave mold cavity and the outer edge of the convex mold body are provided with process edges.

[0010] Compared with the prior art, the beneficial effects of this utility model are: simple overall structure, convenient installation and disassembly, improved part positioning accuracy in production, improved heating uniformity, higher welding rate of upper and lower skins, and higher part qualification rate. Moreover, with the development of the aerospace industry, the demand for large honeycomb structure parts is increasing, thus improving the production efficiency and qualification rate of honeycomb brazed parts. Attached Figure Description

[0011] Figure 1 This is an isometric view of the main structure of this utility model; Figure 2 This is a bottom-view axonometric drawing of the main structure of this utility model; Figure 3 This is an exploded isometric view of the main structure of this utility model; Figure 4 This is an isometric view of the lower mold structure of this utility model; Figure 5 This is an isometric view of the upper module structure of this utility model; Figure 6 This is a schematic diagram of the lower mold structure of this utility model; Figure 7 This is a schematic diagram of the upper module structure of this utility model.

[0012] In the diagram: 1-lower mold, 2-upper mold assembly, 201-first upper mold, 202-second upper mold, 203-third upper mold, 204-fourth upper mold, 3-cavity mold, 4-punch body, 5-connecting bolt groove, 6-connecting groove, 7-first process groove, 8-second process groove, 9-process boss, 10-limiting hole, 11-process groove, 12-reinforcing rib, 13-weight reduction hole, 14-weight reduction groove, 15-pin hole, 16-process edge. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1-7 This utility model provides a brazing fixture for a large honeycomb part with a split structure, including a lower mold 1, an upper mold assembly 2 above the lower mold 1, and a cavity 3 penetrating through both ends of the lower mold 1. A punch 4 is provided on the lower surface of the upper mold assembly 2 at a position corresponding to the cavity 3, and the punch 4 cooperates with the cavity 3. A connecting bolt groove 5 is provided on the upper surface of the lower mold 1 at the outer edges on both sides of the cavity 3. A connecting groove 6 is provided on the lower surface of the upper mold assembly 2 at the outer edges on both sides of the punch 4, and the connecting groove 6 is corresponding to the connecting bolt groove 5. A first process groove 7 is provided on one side of the lower surface of the upper mold assembly 2, and a second process groove 8 is provided on the other side of the lower surface of the upper mold assembly 2. A process boss 9 is provided on the lower surface of the upper mold assembly 2 inside the second process groove 8.

[0015] In use, the lower mold 1 is designed as an integrated structure to facilitate the positioning and installation of blanks such as the lower skin, core layer, upper skin, and brazing foil of large honeycomb parts. The upper mold 2 is designed as a split structure to facilitate the positioning and installation of parts. During heating, it expands uniformly with the lower mold 1 to prevent the blanks from being squeezed and deformed. The blanks that need to be brazed are placed inside the cavity 3, and the upper mold 2 is installed in sequence. The lower end of the upper mold 2 is provided with a punch 4 to fix the blanks. The lower surface of the punch 4 is provided with a first process groove 7, a second process groove 8, and a process boss 9. The wall thickness of the mold cavity is consistent with the shape of the product. The mold deforms uniformly when heated. Its shape is adapted to the forming requirements of blanks such as the lower skin, core layer, upper skin, and brazing foil of large honeycomb parts, ensuring that the formed shape meets the production requirements. A connecting nut is provided inside the connecting bolt groove 5. The connecting bolt passes through the connecting groove 6 and is threaded to the connecting nut. The upper mold 2 is fixed to the upper end of the lower mold 1 by setting the connecting bolt groove 5 and the connecting groove 6.

[0016] The upper mold assembly 2 includes a first upper mold 201, a second upper mold 202, a third upper mold 203, and a fourth upper mold 204. Limiting holes 10 are provided on both sides between the first upper mold 201, the second upper mold 202, the third upper mold 203, and the fourth upper mold 204. The first upper mold 201, the second upper mold 202, the third upper mold 203, and the fourth upper mold 204 are connected by interlocking with the limiting holes 10. The four sets of first upper molds 201, second upper molds 202, third upper molds 203, and fourth upper molds 204 are thus connected. 02. While meeting the installation and fixing requirements of large honeycomb parts, the No. 3 upper mold 203 and the No. 4 upper mold 204 balance the weight and shape requirements of each upper mold group 2. The No. 1 upper mold 201, the No. 2 upper mold 202, the No. 3 upper mold 203 and the No. 4 upper mold 204 are limited by the splicing limiting holes 10 to ensure the dimensional requirements when connecting the No. 1 upper mold 201, the No. 2 upper mold 202, the No. 3 upper mold 203 and the No. 4 upper mold 204. During heating, they expand evenly with the lower mold to prevent the part blank from being squeezed and deformed.

[0017] Process grooves 11 are provided on the lower part of the lower mold 1 and the upper part of the upper mold 2. Reinforcing ribs 12 are provided between the process grooves 11. Weight-reducing holes 13 are provided on the reinforcing ribs 12 inside the lower mold 1. Weight-reducing grooves 14 are provided on the front and rear side walls of the lower mold 1. By forming the reinforcing rib 12 structure through the process grooves 11, the overall strength and rigidity are increased, and the resistance to deformation is improved. Weight-reducing holes 13 and weight-reducing grooves 14 are provided on the reinforcing ribs 12 to reduce the heat capacity of the mold itself, improve the heat conduction efficiency, accelerate the heating and cooling speed of the mold, improve productivity, and at the same time reduce the concentration of thermal stress in the mold body.

[0018] Pin holes 15 are provided at the front and rear outer edges of the lower mold 1 and the front and rear outer edges of the upper mold 2. The positioning structure is simple and reliable, easy to install, prevents the mold position from changing during movement, and maintains uniform thermal expansion during heating.

[0019] Process edges 16 are provided at the outer edges of the concave cavity 3 and the outer edges of the convex body 4 to separate the concave cavity 3 from the lower mold 1 and the convex body 4 from the upper mold assembly 2, and to ensure the smoothness of the outer edges of the blanks such as the lower skin, core layer, upper skin and brazing foil.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A split structure large honeycomb part brazing tool, characterized by: The assembly includes a lower mold (1), an upper mold assembly (2) above the lower mold (1), a cavity (3) penetrating through both ends of the lower mold (1), a punch (4) corresponding to the cavity (3) on the lower surface of the upper mold assembly (2), the punch (4) cooperating with the cavity (3), a connecting bolt groove (5) on the upper surface of the lower mold (1) and at the outer edges on both sides of the cavity (3), a connecting groove (6) on the lower surface of the upper mold assembly (2) and at the outer edges on both sides of the punch (4), the connecting groove (6) corresponding to the connecting bolt groove (5), a first process groove (7) on one side of the lower surface of the upper mold assembly (2), a second process groove (8) on the other side of the lower surface of the upper mold assembly (2), and a process boss (9) inside the second process groove (8) on the lower surface of the upper mold assembly (2).

2. The split structure large honeycomb part brazing tool according to claim 1, characterized in that: The upper module assembly (2) includes an upper mold No. 1 (201), an upper mold No. 2 (202), an upper mold No. 3 (203), and an upper mold No. 4 (204). Limiting holes (10) are provided on both sides between the upper mold No. 1 (201), the upper mold No. 2 (202), the upper mold No. 3 (203), and the upper mold No. 4 (204). The upper mold No. 1 (201), the upper mold No. 2 (202), the upper mold No. 3 (203), and the upper mold No. 4 (204) are connected to each other by interlocking with the limiting holes (10).

3. The split structure large honeycomb part brazing tool according to claim 1, characterized in that: Process grooves (11) are provided in the lower part of the lower mold (1) and the upper part of the upper mold assembly (2). Reinforcing ribs (12) are provided between the process grooves (11). Weight reduction holes (13) are provided on the reinforcing ribs (12) inside the lower mold (1). Weight reduction grooves (14) are provided on the front and rear side walls of the lower mold (1).

4. The split structure large honeycomb part brazing tool of claim 1, wherein: Pin holes (15) are provided at the front and rear outer edges of the lower mold (1) and the front and rear outer edges of the upper mold (2).

5. The split structure large honeycomb part brazing tool of claim 1, wherein: Both the outer edge of the concave mold cavity (3) and the outer edge of the convex mold body (4) are provided with process edges (16).

Images