Pressurizing jig for diffusion welding and welding method

Abstract

The invention discloses a pressurizing jig for diffusion welding and a welding method, and belongs to the technical field of welding, the pressurizing jig comprises a pressing die, a fixed die and a sealing box, the pressing die is fixed right above the fixed die through a lifting power device, the bottom surface of the pressing die and the top surface of the fixed die are fixedly connected with heating plates, the heating plates are connected with a heating assembly, and the heating assembly is connected with the sealing box. The sealing box comprises a box body and a sealing cover, the sealing cover is provided with an air pressure adjusting assembly, the air pressure adjusting assembly comprises a containing groove located in the bottom face of the sealing cover, a piston body is connected into the containing groove in a matched mode, the piston body is in sliding sealing connection with the containing groove, and a through hole is formed in the top face of the sealing cover and internally connected with a push rod in a sliding mode. The top end of the push rod is located outside the sealing box, the bottom end of the push rod is fixedly connected with the piston body, and the length of the push rod extending out of the sealing box is smaller than the depth of the containing groove. According to the pressurization jig for diffusion welding and the welding method, the machining efficiency of diffusion welding is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and particularly relates to a pressure jig for diffusion welding and a welding method. Background Art

[0002] Diffusion welding refers to a solid-state welding method in which workpieces are pressurized at high temperature without visible deformation and relative movement. Diffusion welding is particularly suitable for joining dissimilar metal materials, heat-resistant alloys and ceramics, intermetallic compounds, composite materials and other new materials. Especially for materials that are difficult to weld by fusion welding methods, diffusion welding has obvious advantages and has increasingly attracted people's attention.

[0003] Chinese Patent with application number CN214518147U provides a vacuum diffusion welding die, including a lower die and an upper die. Welding grooves are provided in the middle of the top end of the lower die and the middle of the bottom end of the upper die. 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. One end of the hot oil flow channel is provided with a hot oil inlet, and the other end of the hot oil flow channel is provided with a hot oil outlet. A heat conduction plate is arranged above the hot oil flow channel. Thermal conductive silicone grease is filled between the hot oil flow channel and the heat conduction plate. An air extraction pipe is provided in the middle of one side of the welding groove.

[0004] When the above structure is in use, it is necessary to first connect the air extraction pipe with a vacuum pump to extract the air in the welding groove, and then inject hot oil into the hot oil flow channel to achieve rapid heating of the workpiece, and then complete the welding of the workpiece. Since the above welding method needs to first evacuate the air and then heat to a certain temperature before welding can be carried out, the working efficiency is low.

[0005] To solve the above problems, a new type of jig and method for diffusion welding are needed. Summary of the Invention

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

[0007] To achieve the above object, the present invention provides a pressure jig for diffusion welding, which includes a lower pressing die, a fixed die, and a sealing box. The lower pressing die is fixed directly above the fixed die through a lifting power device. Heating plates are fixedly connected to the bottom surface of the lower pressing die and the top surface of the fixed die, and the heating plates are connected to a heating assembly. The sealing box includes a box body and a sealing cover, and 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 includes a receiving groove on the bottom surface of the sealing cover. A piston body is adaptively connected in the receiving groove, and the piston body is slidably and sealingly connected to the receiving groove. A through hole is provided on the top surface of the sealing cover, and a push rod adapted to the structure of the through hole is slidably connected in the through hole. The top end of the push rod is located outside the sealing box, and 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 depth of the receiving groove.

[0008] Preferably, the top end of the piston body is fixedly connected to an end cap, and a guide rod is fixedly connected to the bottom surface of the end cap. A groove adapted to the structure of the end cap is provided on the top surface of the sealing cover, and a guide groove adapted to the structure of the guide rod is provided at the bottom of the groove. 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, a first sealing sleeve is fixedly connected to the sealing cover on the surface where the sealing cover and the box body are in contact, a second sealing sleeve is fixedly connected to the piston body on the surface where the piston body and the receiving groove are in contact, and a third sealing sleeve is fixedly connected to the push rod on the surface where the push rod and the through hole are in contact.

[0010] Preferably, the heating assembly includes heating holes uniformly distributed on the heating plate, and a heating rod is adaptively connected in each heating hole.

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

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

[0013] Preferably, an air inlet and an air outlet are provided on the side wall of the sealing box, and valves are provided in both the air inlet and the air outlet.

[0014] A welding method using the pressure jig for diffusion welding includes the following steps: Step 1: Stack the welding surfaces of the products to be welded together and place them into the box body. Then, place the sealing cover on the top opening of the box body to assemble and seal the sealed box. Subsequently, place the sealed box on the heating plate of the fixed mold. Step 2: Use the heating component to heat the heating plate. Step 3: Use the lifting power device to drive the lower pressing mold to descend. The heating plate on the lower pressing mold presses the push rod down into the through hole. At this time, the heating plate on the lower pressing mold contacts the top surface of the sealed box to heat the sealed box, and the heating plate on the fixed mold contacts the bottom surface of the sealed box to heat the sealed box. At the same time, the piston body moves downward under the action of the push rod, occupying more cavity space inside the sealed box, thereby increasing the gas pressure inside the sealed box. The combined use of the heating plate and the piston body realizes a high-temperature and high-pressure environment inside the sealed box, and thus completes the welding of the products to be welded.

[0015] Therefore, the pressure application fixture and welding method for diffusion welding using the above structure in the present invention have the following beneficial effects: By using the action of the lifting power device to drive the lower pressing mold to descend, it can simultaneously heat the sealed box and increase the pressure of the gas inside the sealed box, making the environment inside the sealed box reach a high-temperature and high-pressure environment that meets the requirements of diffusion welding, and improving the processing efficiency.

[0016] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of an embodiment of a pressure application fixture for diffusion welding according to the present invention; Figure 2 It is a schematic structural diagram of an embodiment of a sealed box in a pressure application fixture for diffusion welding according to the present invention; Figure 3 It is a schematic structural diagram of another angle of an embodiment of a sealed box in a pressure application fixture for diffusion welding according to the present invention; Figure 4 It is a schematic structural diagram of an embodiment of a push rod in a pressure application fixture for diffusion welding according to the present invention; Figure 5 It is a schematic structural diagram of an embodiment of a through hole in a pressure application fixture for diffusion welding according to the present invention.

[0018] In the figure: 1. Lower pressing mold; 2. Fixed mold; 3. Sealed 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. Inflation port; 16. Exhaust port. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes. Embodiment

[0021] Refer to Figures 1-5 As shown, this embodiment provides a pressure tool for diffusion welding, including a lower pressing die 1, a fixed die 2, and a sealing box 3. The lower pressing die 1 is fixed directly above the fixed die 2 through a lifting power device. The lifting power device is a hydraulic press. During use, the lower pressing die 1 is fixed on the pressing head of the hydraulic press, so that the hydraulic press drives the lower pressing die 1 to lift and lower. Heating plates 4 are fixedly connected to the bottom surface of the lower pressing die 1 and the top surface of the fixed die 2. The heating plates 4 are connected to a heating component, and the heating component is used to increase the temperature of the heating plates 4. The sealing box 3 includes a box body 301 and a sealing cover 302. The sealing cover 302 is adaptively 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. A pressure regulating component is provided on the sealing cover 302. The number of pressure regulating components can be set to multiple according to needs. In this embodiment, one pressure regulating component is provided.

[0022] The air pressure regulating component includes a receiving groove on the bottom surface of the sealing cover 302. A piston body 5 is adaptively connected in the receiving groove, and the piston body 5 is slidably and sealingly connected to the receiving groove. When the piston body 5 moves downward along the receiving groove, the piston body 5 will occupy the space of the inner cavity of the sealing box 3, thereby increasing the gas pressure in the sealing box 3. A through hole 6 is provided on the top surface of the sealing cover 302, and 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, 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 lower pressing die 1 to transmit a downward acting force to the piston body 5, so as to urge 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 receiving groove. This length design can ensure that when the piston body 5 descends to the lowest position under the action of the push rod 7, the piston body 5 will not come out of the receiving groove, and the air in the inner cavity of the sealing box 3 will not enter the receiving groove to affect the pressurization effect; this length design can also ensure that when the piston body 5 descends 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 make more comprehensive contact with the sealing box 3, thereby ensuring the heat conduction efficiency from the heating plate 4 to the sealing box 3.

[0023] A welding method using a pressurizing jig for diffusion welding includes the following steps: 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 complete the assembly and sealing of the sealing box 3. Subsequently, place the sealing box 3 on the heating plate 4 of the fixed die 2. Step 2: Use the heating component to heat the heating plate 4. Step 3: Use the lifting power device to drive the lower pressing die 1 to descend. The heating plate 4 on the lower pressing die 1 presses the push rod 7 into the through hole 6. At this time, the heating plate 4 on the lower pressing die 1 contacts the top surface of the sealing box 3 to heat the sealing box 3, and the heating plate 4 on the fixed die 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 combined use of the heating plate 4 and the piston body 5 creates a high-temperature and high-pressure environment in the sealing box 3, thereby completing the welding of the products to be welded.

[0024] A further preferred solution is that the top end of the piston body 5 is fixedly connected to the end cap 8, and a guide rod 9 is fixedly connected to the bottom surface of the end cap 8. A groove 10 adapted to the structure of the end cap 8 is provided on the top surface of the sealing cover 302. After the push rod 7 descends to the lowest position, the end cap 8 can enter the groove 10, thereby ensuring that the sealing box 3 can be in full contact with the heating plate 4 and ensuring the heat conduction efficiency. A guide groove 11 adapted to the structure of the guide rod 9 is provided at the bottom of the groove 10, and 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. The spring 12 can enable the push rod 7 to reset after separating the heating plate 4 on the lower pressing die 1 from the sealing box 3, thereby restoring the air pressure value in the inner cavity of the sealing box 3 and avoiding the danger of ejecting the sealing cover 302 due to the too high air pressure value in the inner cavity of the sealing box 3.

[0025] A further preferred solution is that a first sealing sleeve is fixedly connected to the sealing cover 302 on the surface where the sealing cover 302 contacts the box body 301, and the first sealing sleeve can ensure the sealing performance between the sealing cover 302 and the box body 301. A second sealing sleeve is fixedly connected to the piston body 5 on the surface where the piston body 5 contacts the receiving groove, and the second sealing sleeve can ensure the sealing performance between the piston body 5 and the receiving groove. A third sealing sleeve is fixedly connected to the push rod 7 on the surface where the push rod 7 contacts the through hole 6, and the third sealing sleeve can ensure the sealing performance between the push rod 7 and the through hole 6. According to the use environment, the first sealing sleeve, the second sealing sleeve and the third sealing sleeve should be made of high-temperature resistant materials.

[0026] A further preferred solution is that the heating assembly includes heating holes uniformly distributed on the heating plate 4, and a heating rod 13 is adaptively connected in each heating hole. The heating rods 13 can be connected in parallel, and after one heating rod 13 is damaged, the other heating rods 13 can still realize the heating function of the heating plate 4.

[0027] A further preferred solution is that a cooling channel is provided in the side wall of the sealing box 3 perpendicular to the lower pressing die 1. Pipe joints 14 are provided at both ends of the cooling channel. According to the use environment, the pipe joints 14 should be made of high-temperature resistant materials. After the diffusion welding is completed, one end of the cooling channel is connected to the coolant supply device through a coolant delivery pipe by using the pipe joint 14, and the other end of the cooling channel is connected to the recovery barrel through a coolant recovery pipe. The heat on the sealing box 3 is carried away by the flow of the coolant in the cooling channel to realize the rapid cooling of the sealing box 3.

[0028] A further preferred solution is that an inflation port 15 and an exhaust port 16 are provided on the side wall of the sealing box 3. Valves are provided in both the inflation port 15 and the exhaust port 16. According to the use environment, the valves should be made of heat-resistant and high-pressure-resistant materials. Before welding, consider whether it is necessary to use inert gas to reduce the oxygen concentration in the sealing box 3 according to the need for oxidation resistance of the welded parts. When it is necessary to reduce the oxygen concentration, connect the inflation port 15 to the inert gas delivery pipe, then open the valves at the inflation port 15 and the exhaust port 16, and close the valves at the inflation port 15 and the exhaust port 16 after filling with inert gas for a certain time, so that the oxygen concentration in the sealing box 3 meets the welding requirements, and then carry out the normal welding process.

[0029] Therefore, by adopting the above-mentioned structure of a pressure jig and welding method for diffusion welding, the processing efficiency of diffusion welding can be improved.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus cannot be understood as a limitation of the present invention.

[0031] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A pressure tool for diffusion welding, characterized in that: It includes a pressing die (1), a fixed die (2) and a sealing box (3). The pressing die (1) is fixed directly above the fixed die (2) by a lifting power device. Heating plates (4) are fixedly connected to the bottom surface of the pressing die (1) and the top surface of the fixed die (2). The heating plates (4) are connected to a heating assembly. The sealing box (3) includes a box body (301) and a sealing cover (302). The sealing cover (302) is adaptively connected to the opening at the top of the box body (301). An air pressure regulating assembly is provided on the sealing cover (302). The air pressure regulating assembly includes a receiving groove on the bottom surface of the sealing cover (302). A piston body (5) is adaptively connected in the receiving groove. The piston body (5) is slidably 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). The length of the push rod (7) extending out of the sealing box (3) is less than the depth of the receiving groove.

2. The pressure jig for diffusion welding according to claim 1, characterized in that: The top end of the piston body (5) is fixedly connected to an end cap (8). A guide rod (9) is fixedly connected to the bottom surface of the end cap (8). A groove (10) adapted to the structure of the end cap (8) is provided on the top surface of the sealing cover (302). A guide groove (11) adapted to the structure of the guide rod (9) is provided at the bottom of the groove (10). 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). The top end of the spring (12) is fixedly connected to the guide rod (9).

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

4. The pressure jig for diffusion bonding according to claim 1, characterized in that: The heating assembly includes heating holes uniformly distributed on the heating plates (4). A heating rod (13) is adaptively connected in each heating hole.

5. The pressure jig for diffusion welding according to claim 1, characterized in that: The lifting power device is a hydraulic press.

6. The pressure jig for diffusion welding according to claim 1, characterized in that: A cooling channel is provided in the side wall of the sealing box (3) perpendicular to the side wall of the pressing die (1). Pipe joints (14) are provided at both ends of the cooling channel.

7. The pressure jig for diffusion welding according to claim 1, wherein: An air inlet (15) and an air outlet (16) are provided on the side wall of the sealing box (3). Valves are provided in both the air inlet (15) and the air outlet (16).

8. A welding method using the pressure jig for diffusion welding according to any one of claims 1-7, characterized in that: It includes the following steps: 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 sealed box (3). Subsequently, place the sealed box (3) on the heating plate (4) of the fixed mold (2). Step 2: Use the heating component to heat the heating plate (4). Step 3: Use the lifting power device to drive the lower pressing mold (1) to descend. The heating plate (4) on the lower pressing mold (1) presses the push rod (7) into the through hole (6). At this time, the heating plate (4) on the lower pressing mold (1) contacts the top surface of the sealed box (3) to heat the sealed box (3), and the heating plate (4) on the fixed mold (2) contacts the bottom surface of the sealed box (3) to heat the sealed box (3). At the same time, the piston body (5) moves downward under the action of the push rod (7), occupying more cavity space inside the sealed box (3), thereby increasing the gas pressure inside the sealed box (3). The combined use of the heating plate (4) and the piston body (5) realizes a high-temperature and high-pressure environment inside the sealed box (3), thereby completing the welding of the products to be welded.

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