A pressure jig for diffusion welding and welding method

Abstract

The present invention discloses a pressurized tool for diffusion welding and a welding method, belonging to the field of welding technology. The tool comprises a lower pressing mold, a fixed mold, and a sealing box. The lower pressing mold is fixed directly above the fixed mold by a lifting power device. The bottom surface of the lower pressing mold and the top surface of the fixed mold are both fixedly connected to a heating plate, which is connected to a heating component. The sealing box comprises a box body and a sealing cover. The sealing cover is provided with an air pressure regulating assembly. The air pressure regulating assembly includes a receiving groove located on the bottom surface of the sealing cover. A piston body is adapted to be connected in the receiving groove. The piston body is slidably and sealingly connected to the receiving groove. The top surface of the sealing cover is provided with a push rod slidably connected in the through hole. The top end of the push rod is located outside the sealing box. The bottom end of the push rod is fixedly connected to the piston body. The length of the push rod extending out of the sealing box is less than the groove depth of the receiving groove. The present invention adopts a pressurized tool for diffusion welding and a welding method of the above structure to improve the processing efficiency of diffusion welding.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and in particular relates to a pressurized tool for diffusion welding and a welding method. Background Art

[0002] Diffusion welding is a solid-state welding method that applies pressure to workpieces at high temperatures without causing visible deformation or relative movement. Diffusion welding is particularly well-suited for joining dissimilar metals, heat-resistant alloys, ceramics, intermetallic compounds, composite materials, and other new materials. Diffusion welding offers significant advantages, particularly for materials difficult to join by fusion welding, and is gaining increasing attention.

[0003] The Chinese patent application number CN214518147U provides a vacuum diffusion welding mold, including a lower mold and an upper mold. A welding groove is provided in the middle of the top end of the lower mold and the middle of the bottom end of the upper mold. A hot oil flow channel is provided at the bottom of the welding groove. The hot oil flow channel is arranged in a "bow" shape. A hot oil inlet is provided at one end of the hot oil flow channel, and a hot oil outlet is provided at the other end of the hot oil flow channel. A heat conduction plate is provided above the hot oil flow channel. Thermal grease is filled between the hot oil flow channel and the heat conduction plate. An exhaust pipe is provided in the middle of one side of the welding groove.

[0004] When using the above structure, a vacuum pump must first be connected to an exhaust pipe to extract the air from the welding tank. Then, hot oil is injected into the hot oil flow channel to quickly heat the workpiece and complete the welding. The above welding method has low efficiency because it requires vacuuming and then heating to a certain temperature before welding can begin.

[0005] In order to solve the above problems, it is necessary to provide a new type of diffusion welding jig and method. Summary of the Invention

[0006] The object of the present invention is to provide a pressurized jig for diffusion welding and a welding method, which can improve the processing efficiency of diffusion welding.

[0007] To achieve the above-mentioned objectives, the present invention provides a pressurized metallurgy for diffusion welding, comprising a lower pressing mold, a fixed mold and a sealing box, wherein the lower pressing mold is fixed directly above the fixed mold by a lifting power device, the bottom surface of the lower pressing mold and the top surface of the fixed mold are fixedly connected to a heating plate, the heating plate is connected to the heating component, the sealing box comprises a box body and a sealing cover, the sealing cover is adaptively connected to the opening at the top of the box body, an air pressure regulating assembly is provided on the sealing cover, the air pressure regulating assembly comprises a receiving groove located on the bottom surface of the sealing cover, a piston body is adaptively connected in the receiving groove, the piston body is slidingly and sealingly connected to the receiving groove, a through hole is provided on the top surface of the sealing cover, a push rod adapted to the through hole structure is slidably connected in the through hole, the top end of the push rod is located on the outside of the sealing box, the bottom end of the push rod is fixedly connected to the piston body, and the length of the push rod extending out of the sealing box is less than the groove depth of the receiving groove.

[0008] Preferably, the top end of the piston body is fixedly connected to the end cap, the bottom surface of the end cap is fixedly connected to a guide rod, the top surface of the sealing cover is provided with a groove adapted to the end cap structure, the bottom of the groove is provided with a guide groove adapted to the guide rod structure, a spring is provided in the guide groove, the bottom end of the spring is fixedly connected to the guide groove, and the top end of the spring is fixedly connected to the guide rod.

[0009] Preferably, the sealing cover is fixedly connected to a first sealing sleeve located on the surface where the sealing cover and the box body are in contact, the piston body is fixedly connected to a second sealing sleeve located on the surface where the piston body and the accommodating groove are in contact, and the push rod is fixedly connected to a third sealing sleeve located on the surface where the push rod and the through hole are in contact.

[0010] Preferably, the heating assembly comprises heating holes evenly distributed on the heating plate, and a heating rod is adapted to be connected in each of the heating holes.

[0011] Preferably, the lifting power device is a hydraulic press.

[0012] Preferably, a cooling channel is provided in a side wall of the sealing box perpendicular to the pressing die, and pipe joints are provided at both ends of the cooling channel.

[0013] Preferably, an inflation port and an exhaust port are provided on the side wall of the sealing box, and valves are provided in the inflation port and the exhaust port.

[0014] The welding method using a pressurized jig for diffusion welding includes the following steps:

[0015] Step 1: stack the welding surfaces of the products to be welded together and place them in the box body, then place the sealing cover on the top opening of the box body to assemble and seal the sealed box, and then place the sealed box on the heating plate of the fixed mold;

[0016] Step 2: heating the heating plate by using the heating assembly;

[0017] Step 3: Use the lifting power device to drive the pressing mold to descend, and the heating plate on the pressing mold presses the push rod down into the through hole. At this time, the heating plate on the pressing mold contacts the top surface of the sealing box to heat the sealing box, and the heating plate on the fixed mold contacts the bottom surface of the sealing box to heat the sealing box. At the same time, the piston body moves downward under the action of the push rod, occupying more cavity space in the sealing box, thereby increasing the gas pressure in the sealing box. The cooperation of the heating plate and the piston body realizes a high temperature and high pressure environment in the sealing box, thereby completing the welding of the product to be welded.

[0018] Therefore, the present invention adopts a pressurized jig and welding method for diffusion welding with the above-mentioned structure, which has the following beneficial effects: by utilizing the lifting power device to drive the lower pressing mold to descend, it is possible to simultaneously heat the sealing box and pressurize the gas in the sealing box, so that the environment in the sealing box reaches a high temperature and high pressure environment that meets the requirements of diffusion welding, thereby improving processing efficiency.

[0019] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of an embodiment of a pressurized jig for diffusion welding according to the present invention;

[0021] Figure 2 This is a schematic structural diagram of an embodiment of a sealing box in a pressurized jig for diffusion welding according to the present invention;

[0022] Figure 3 Schematic diagram of the structure of another embodiment of a sealing box in a pressurized jig for diffusion bonding according to the present invention;

[0023] Figure 4 This is a schematic structural diagram of an embodiment of a push rod in a pressurized jig for diffusion welding according to the present invention;

[0024] Figure 5 The figure is a schematic structural diagram of an embodiment of a through hole in a pressurized jig for diffusion welding according to the present invention.

[0025] In the figure: 1. Pressing mold; 2. Fixed mold; 3. Sealing box; 301. Box body; 302. Sealing cover; 4. Heating plate; 5. Piston body; 6. Through hole; 7. Push rod; 8. End cap; 9. Guide rod; 10. Groove; 11. Guide groove; 12. Spring; 13. Heating rod; 14. Pipe joint; 15. Inflating port; 16. Exhaust port. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0028] Reference Figure 1-5 As shown, this embodiment provides a pressurized tool for diffusion welding, including a lower pressing mold 1, a fixed mold 2 and a sealing box 3. The lower pressing mold 1 is fixed directly above the fixed mold 2 by a lifting power device. The lifting power device is a hydraulic press. When in use, the lower pressing mold 1 is fixed to the pressure head of the hydraulic press so that the hydraulic press drives the lower pressing mold 1 to rise and fall. The bottom surface of the lower pressing mold 1 and the top surface of the fixed mold 2 are fixedly connected with a heating plate 4. The heating plate 4 is connected to a heating component. The heating component is used to increase the temperature of the heating plate 4. The sealing box 3 includes a box body 301 and a sealing cover 302. The sealing cover 302 is adapted to be connected to the opening at the top of the box body 301. The specific connection method can be that a boss adapted to the structure of the sealing cover 302 is provided on the inner wall of the box body 301. An air pressure regulating assembly is provided on the sealing cover 302. The number of air pressure regulating assemblies can be set as needed. In this embodiment, there is only one air pressure regulating assembly.

[0029] The air pressure regulating assembly includes a receiving groove located on the bottom surface of the sealing cover 302, in which a piston body 5 is adapted to be connected. The piston body 5 is slidably and sealedly connected to the receiving groove. When the piston body 5 moves downward along the receiving groove, the piston body 5 will occupy the space in the inner cavity of the sealing box 3, thereby increasing the gas pressure in the sealing box 3. The top surface of the sealing cover 302 is provided with a through hole 6, in which a push rod 7 adapted to the structure of the through hole 6 is slidably connected. The top end of the push rod 7 is located on the outside of the sealing box 3, and the bottom end of the push rod 7 is fixedly connected to the piston body 5. The push rod 7 is used to contact the heating plate 4 on the pressing mold 1 and then transmit a downward force to the piston body 5, prompting the piston body 5 to move downward along the receiving groove. The length of the push rod 7 extending out of the sealing box 3 is less than the depth of the accommodating groove. This length design can ensure that when the piston body 5 drops to the lowest position under the action of the push rod 7, the piston body 5 will not fall out of the accommodating groove, and the air in the inner cavity of the sealing box 3 will not enter the accommodating groove and thus affect the pressurization effect; this length design can also ensure that when the piston body 5 drops to the lowest position under the action of the push rod 7, the push rod 7 can completely enter the through hole 6, and the heating plate 4 can have more comprehensive contact with the sealing box 3, thereby ensuring the heat conduction efficiency from the heating plate 4 to the sealing box 3.

[0030] The welding method using a pressurized jig for diffusion welding includes the following steps:

[0031] Step 1: Stack the welding surfaces of the products to be welded together and place them into the box body 301. Then, place the sealing cover 302 on the top opening of the box body 301 to assemble and seal the sealing box 3. Then, place the sealing box 3 on the heating plate 4 of the fixed mold 2.

[0032] Step 2: Using a heating assembly to heat the heating plate 4;

[0033] Step 3: Use the lifting power device to drive the pressing mold 1 to descend, and the heating plate 4 on the pressing mold 1 presses the push rod 7 down into the through hole 6. At this time, the heating plate 4 on the pressing mold 1 contacts the top surface of the sealing box 3 to heat the sealing box 3, and the heating plate 4 on the fixed mold 2 contacts the bottom surface of the sealing box 3 to heat the sealing box 3. At the same time, the piston body 5 moves downward under the action of the push rod 7, occupying more cavity space in the sealing box 3, thereby increasing the gas pressure in the sealing box 3. The coordinated use of the heating plate 4 and the piston body 5 realizes a high temperature and high pressure environment in the sealing box 3, thereby completing the welding of the product to be welded.

[0034] In a further preferred embodiment, the top of the piston body 5 is fixedly connected to the end cap 8, and the bottom surface of the end cap 8 is fixedly connected to the guide rod 9. The top surface of the sealing cover 302 is provided with a groove 10 that is compatible with the structure of the end cap 8. After the push rod 7 is lowered to the lowest position, the end cap 8 can enter the groove 10, thereby ensuring that the sealing box 3 can fully contact the heating plate 4 and ensure heat conduction efficiency. The bottom of the groove 10 is provided with a guide groove 11 that is compatible with the structure of the guide rod 9. A spring 12 is installed in the guide groove 11. The bottom end of the spring 12 is fixedly connected to the guide groove 11, and the top end of the spring 12 is fixedly connected to the guide rod 9. The spring 12 can reset the push rod 7 after the heating plate 4 on the pressing mold 1 is separated from the sealing box 3, thereby restoring the air pressure value in the cavity of the sealing box 3, and preventing the sealing cover 302 from being ejected due to excessive air pressure in the cavity of the sealing box 3.

[0035] In a further preferred embodiment, the sealing cover 302 is fixedly connected to a first sealing sleeve located on the surface where the sealing cover 302 contacts the box body 301. The first sealing sleeve ensures the seal between the sealing cover 302 and the box body 301. The piston body 5 is fixedly connected to a second sealing sleeve located on the surface where the piston body 5 contacts the receiving groove. The second sealing sleeve ensures the seal between the piston body 5 and the receiving groove. The push rod 7 is fixedly connected to a third sealing sleeve located on the surface where the push rod 7 contacts the through hole 6. The third sealing sleeve ensures the seal between the push rod 7 and the through hole 6. Depending on the operating environment, the first, second, and third sealing sleeves should be made of high-temperature resistant materials.

[0036] In a further preferred embodiment, the heating assembly includes heating holes evenly distributed on the heating plate 4, each of which is adapted to be connected to a heating rod 13. The heating rods 13 can be connected in parallel, so that if one heating rod 13 is damaged, the other heating rods 13 can still heat the heating plate 4.

[0037] In a further preferred embodiment, a cooling channel is provided in the side wall of the sealing box 3 perpendicular to the lower pressing die 1. Pipe connectors 14 are provided at both ends of the cooling channel. Pipe connectors 14 should be made of a high-temperature resistant material, depending on the intended use environment. After diffusion welding is completed, pipe connectors 14 are used to connect one end of the cooling channel to a coolant supply device via a coolant delivery pipe, and the other end of the cooling channel is connected to a recovery tank via a coolant recovery pipe. The coolant flowing in the cooling channel removes heat from the sealing box 3, thereby rapidly cooling the sealing box 3.

[0038] In a further preferred embodiment, the side wall of the sealed box 3 is provided with an air filling port 15 and an air exhaust port 16, and valves are provided in the air filling port 15 and the air exhaust port 16. The valves should be made of high-temperature and high-pressure resistant materials according to the use environment. Before welding, it is considered whether it is necessary to use inert gas to reduce the oxygen concentration in the sealed box 3 according to the anti-oxidation needs of the welded parts. When the oxygen concentration needs to be reduced, the air filling port 15 is connected to the inert gas delivery pipe, and then the valves at the air filling port 15 and the air exhaust port 16 are opened. After the inert gas is filled for a certain period of time, the valves at the air filling port 15 and the air exhaust port 16 are closed so that the oxygen concentration in the sealed box 3 meets the welding requirements, and then the normal welding process is carried out.

[0039] Therefore, the present invention adopts a diffusion welding pressurized jig and welding method having the above-mentioned structure, which can improve the processing efficiency of diffusion welding.

[0040] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A pressurized tool for diffusion welding, characterized in that: The invention comprises a pressing mold (1), a fixed mold (2) and a sealing box (3), wherein the pressing mold (1) is fixed directly above the fixed mold (2) by a lifting power device, the bottom surface of the pressing mold (1) and the top surface of the fixed mold (2) are fixedly connected with a heating plate (4), and the heating plate (4) is connected to a heating component, and the sealing box (3) comprises a box body (301) and a sealing cover (302), the sealing cover (302) is adapted to be connected to the opening at the top of the box body (301), and an air pressure regulating component is provided on the sealing cover (302), and the air pressure regulating component is provided on the sealing cover (302). The component includes a receiving groove located on the bottom surface of the sealing cover (302), a piston body (5) is adapted to be connected in the receiving groove, the piston body (5) is slidingly and sealingly connected to the receiving groove, a through hole (6) is provided on the top surface of the sealing cover (302), a push rod (7) adapted to the structure of the through hole (6) is slidably connected in the through hole (6), the top end of the push rod (7) is located outside the sealing box (3), the bottom end of the push rod (7) is fixedly connected to the piston body (5), and the length of the push rod (7) extending out of the sealing box (3) is less than the groove depth of the receiving groove.

2. The diffusion bonding press jig according to claim 1, wherein: The top end of the piston body (5) is fixedly connected to the end cap (8), the bottom surface of the end cap (8) is fixedly connected to the guide rod (9), the top surface of the sealing cover (302) is provided with a groove (10) adapted to the structure of the end cap (8), the bottom of the groove (10) is provided with a guide groove (11) adapted to the structure of the guide rod (9), a spring (12) is provided in the guide groove (11), the bottom end of the spring (12) is fixedly connected to the guide groove (11), and the top end of the spring (12) is fixedly connected to the guide rod (9).

3. The diffusion bonding press jig according to claim 1, wherein: The sealing cover (302) is fixedly connected to a first sealing sleeve located on a surface where the sealing cover (302) and the box body (301) are in contact. The piston body (5) is fixedly connected to a second sealing sleeve located on a surface where the piston body (5) and the receiving groove are in contact. The push rod (7) is fixedly connected to a third sealing sleeve located on a surface where the push rod (7) and the through hole (6) are in contact.

4. The diffusion bonding press jig according to claim 1, wherein: The heating assembly comprises heating holes evenly distributed on the heating plate (4), and a heating rod (13) is adapted to be connected in each of the heating holes.

5. The diffusion bonding press jig according to claim 1, wherein: The lifting power device is a hydraulic press.

6. The diffusion bonding press jig according to claim 1, wherein: A cooling channel is provided in the side wall of the sealing box (3) perpendicular to the pressing die (1), and pipe joints (14) are provided at both ends of the cooling channel.

7. The diffusion bonding press jig according to claim 1, wherein: An air filling port (15) and an air discharge port (16) are provided on the side wall of the sealing box (3), and valves are provided in the air filling port (15) and the air discharge port (16).

8. A welding method using the diffusion welding press jig according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: stack the welding surfaces of the products to be welded together and place them into the box body (301), then place the sealing cover (302) on the top opening of the box body (301) to assemble and seal the sealing box (3), and then place the sealing box (3) on the heating plate (4) of the fixed mold (2); Step 2: using the heating assembly to heat the heating plate (4); Step 3: The lower pressing mold (1) is driven to descend by the lifting power device, and the heating plate (4) on the lower pressing mold (1) presses the push rod (7) down into the through hole (6). At this time, the heating plate (4) on the lower pressing mold (1) contacts the top surface of the sealing box (3) to heat the sealing box (3), and the heating plate (4) on the fixed mold (2) contacts the bottom surface of the sealing box (3) to heat the sealing box (3). At the same time, the piston body (5) moves downward under the action of the push rod (7), occupying more cavity space in the sealing box (3), thereby increasing the gas pressure in the sealing box (3). The coordinated use of the heating plate (4) and the piston body (5) realizes a high temperature and high pressure environment in the sealing box (3), thereby completing the welding of the product to be welded.

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