Ultrasonic-assisted vacuum brazing device

Abstract

The utility model relates to the technical field of brazing, in particular to an ultrasonic-assisted vacuum brazing device which comprises a vacuum chamber, the lower end of the vacuum chamber is fixedly connected with a heater, the upper end of the vacuum chamber is provided with a connecting pipe, and the side face of the vacuum chamber is provided with an operation opening. The brazing mechanism is mounted in the vacuum chamber; the brazing mechanism comprises a heating coil installed on the bottom wall of the vacuum chamber. Under the action of the weldment attaching assembly, to-be-welded pieces needing to be brazed are attached to each other through the weldment positioning assembly to form a brazing seam gap with the appropriate size, the positions of the to-be-welded pieces can be longitudinally adjusted through the action of the weldment attaching assembly, the two to-be-welded pieces can be located on the inner side of a heating coil, and the purpose that in the brazing process, the brazing seam gap with the appropriate size is formed is achieved. The ultrasonic vibration is applied to ensure that the brazing seam gap between the two to-be-welded parts is 0.03-0.6 mm, gas in the liquid brazing filler metal can be promoted to overflow by applying the ultrasonic vibration, grains are refined, and therefore the connection strength of the two to-be-welded parts is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of brazing, in particular to an ultrasonic assisted vacuum brazing device. Background Art

[0002] Vacuum brazing is a hot working welding method performed in a vacuum environment. It uses the high temperature environment in a vacuum furnace to heat the brazing material (a metal material with a lower melting point than the parent material) to a molten state, and then the liquid brazing material wets and fills the gap between the parent materials to form a firm welded joint. Under a vacuum state, oxidation and contamination during the welding process are greatly reduced, thereby improving the quality and stability of the welded joint. However, under a vacuum state, due to operational limitations, the assembly gap between the welded parts is difficult to control. The appropriate brazing gap is 0.03-0.6 mm. Too large or too small a brazing gap will reduce the performance of the brazed joint. Therefore, precise control of the brazing gap during vacuum brazing is a technical problem that needs to be solved urgently. In addition, during non-vacuum brazing, the operator promotes the wetting and spreading of the liquid brazing material and the exhaust and slag removal by squeezing, pushing and pulling the workpieces to be welded when the brazing material is melted. However, under vacuum conditions, due to operational limitations, it is difficult to regulate the wetting, filling and solidification behavior of the liquid brazing material, which is not conducive to the exhaust and slag removal of the liquid brazing material. In particular, a large number of coarse hard and brittle phases are formed in the liquid brazing material, which hinders the flow of the brazing material. After cooling, a large number of shrinkage cavities, shrinkage and pores are formed in the brazing seam, which significantly reduces the performance of the brazed joint. The existing ultrasonic mechanism includes an ultrasonic generator, an ultrasonic transducer and an ultrasonic amplitude transformer. During the brazing process, ultrasonic vibration is applied to the workpiece. The ultrasonic oscillation motion, cavitation effect and acoustic streaming effect are used to promote the wetting and filling of the liquid brazing material on the one hand, and on the other hand, the coarse hard and brittle phases are broken and the grains are refined during the solidification of the liquid brazing material, which promotes the flow of the liquid brazing material and the overflow of the gas, significantly reducing the porosity, shrinkage and shrinkage in the brazing seam alloy, and greatly improving the performance of the brazed joint.

[0003] After searching the prior art for "ultrasonic assisted vacuum brazing equipment", the announcement number is "CN103394783B". This device completes the brazing connection of the workpieces to be welded under non-oxidizing gas protection conditions by backfilling nitrogen, argon and other protective gases after vacuuming. However, when two workpieces to be welded are brazed, it is easy for the two workpieces to be welded to have a large loose gap, which will affect the connection strength of the welding. In addition, the vacuum brazing device in this patent fails to effectively integrate ultrasonic auxiliary equipment, which is not conducive to maximizing the performance of the brazed joint.

[0004] Therefore, an ultrasonic assisted vacuum brazing device is proposed to solve the above problems. Utility Model Content

[0005] The purpose of the present utility model is to provide an ultrasonic-assisted vacuum brazing device to solve the above problems, accurately control the assembly gap between workpieces to be brazed, prevent large and loose connection gaps between two workpieces to be brazed, ensure that the brazing seam gap is 0.03 - 0.6 mm during the brazing process, refine the alloy structure of the brazing seam, reduce defects such as pores, shrinkage cavities, and porosity, improve the brazing rate, and enhance the brazing connection strength.

[0006] The present utility model realizes the above purpose through the following technical solutions. An ultrasonic-assisted vacuum brazing device includes: a vacuum chamber, a heater is fixedly connected to the lower end of the vacuum chamber, an ultrasonic horn is installed at the upper end of the vacuum chamber, the lower end of the ultrasonic horn extends into the interior of the vacuum chamber, and an operation port is installed on the side of the vacuum chamber; wherein, the brazing mechanism includes a heating coil installed on the bottom wall of the vacuum chamber, and workpiece fitting components are respectively arranged on both sides of the heating coil, the workpiece fitting components are installed on the inner wall of the vacuum chamber, and workpiece positioning components are arranged on the surfaces of the workpiece fitting components.

[0007] Preferably, the workpiece fitting component includes a guiding track fixedly connected to the inner bottom wall of the vacuum chamber, a positioning frame is fixedly connected to the side of the guiding track away from the operation port, the positioning frame is fixedly connected to the inner wall of the vacuum chamber, a sliding seat is slidably connected to the side of the guiding track away from the positioning frame, a threaded rod is arranged inside the sliding seat, the threaded rod is rotatably connected to the inner wall of the vacuum chamber. During induction brazing, the length of the ultrasonic horn is adjusted so that the end of the ultrasonic horn contacts the surface of the placement frame, and the sliding seat maintains a stable vertical movement effect. Moreover, under the combined action of the guiding track and the positioning frame, a stable supporting state of the guiding track is maintained;

[0008] The workpiece positioning component includes a placement frame installed on the side of the sliding seat away from the guiding track, positioning side plates are fixedly connected to both sides of the placement frame, the positioning side plates are slidably connected to one side of the sliding seat, a threaded counterbore is opened on one side of the positioning side plate and penetrates into the adjacent sliding seat, a connecting bolt is threadedly connected to the inner wall of the threaded counterbore. By passing the connecting bolt into the threaded counterbore and through its threaded connection, the positioning side plate is positioned on the side of the sliding seat, achieving the effect of keeping the position of the placement frame stable.

[0009] Preferably, a threaded pipe is fixedly connected to the inner wall of the sliding seat, the threaded pipe is threadedly connected to the surface of the threaded rod, and an operation knob is fixedly connected to the upper end of the threaded rod. Manually rotate the operation knob, and then when the operation knob rotates, it drives the threaded rod to rotate synchronously. Furthermore, under the cooperation of the threaded connection between the threaded pipe and the threaded rod, the sliding seat can be driven to move synchronously.

[0010] Preferably, a chute is formed on one side of the sliding seat close to the guiding track, and the chute is slidably connected to the inner wall of the guiding track. The chute will make the cooperation between the sliding seat and the guiding track stable.

[0011] Preferably, the longitudinal section of the placement frame is C-shaped, and a threaded sleeve is fixedly connected to the upper end of the placement frame. The lower end of the threaded sleeve penetrates to the inside of the placement frame, and the welding material is placed inside the placement frame.

[0012] Preferably, a positioning bolt is threadedly connected to the inner wall of the threaded sleeve, and the lower end of the positioning bolt extends to the inside of the placement frame. By manually rotating the positioning bolt, under the action of the threaded sleeve, the lower end of the positioning bolt positions the upper end of the welding material.

[0013] The beneficial effects of the present utility model are as follows:

[0014] 1. For the above ultrasonic-assisted vacuum brazing device, the welding parts positioning assembly can make the workpieces to be brazed fit together through the welding parts fitting assembly to form a brazing seam gap of appropriate size. The device can adjust the longitudinal position of the workpieces to be brazed through the action of the welding parts fitting assembly. Two workpieces to be brazed will be located inside the heating coil, ensuring that the brazing seam gap between the two workpieces to be brazed is 0.03 - 0.6 mm during the brazing process. Applying ultrasonic vibration can promote the gas overflow in the liquid brazing filler metal and refine the grains, thereby ensuring the connection strength between the two workpieces to be brazed;

[0015] 2. By setting the welding parts positioning assembly, the workpieces to be brazed can be positioned and clamped under the action of the welding parts positioning assembly. The device maintains the positioning of the placement frame through the positioning side plates on both sides. The connecting bolts penetrate into the internal threaded counterbores, and through the threaded connection, the positioning side plates are positioned on the side of the sliding seat, achieving the stability of the position of the placement frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a schematic diagram of the internal structure of the vacuum chamber of the present utility model;

[0018] Figure 3 is an exploded structural diagram of the welding parts fitting assembly of the present utility model;

[0019] Figure 4 is an exploded structural diagram of the welding parts positioning assembly of the present utility model.

[0020] In the figure: 1. Vacuum chamber; 11. Ultrasonic horn; 12. Operation port; 2. Heater; 3. Brazing mechanism; 31. Workpiece fitting assembly; 311. Guide rail; 312. Positioning frame; 313. Sliding seat; 314. Threaded rod; 315. Operation knob; 316. Threaded tube; 317. Chute; 32. Workpiece positioning assembly; 321. Placement frame; 322. Positioning side plate; 323. Threaded counterbore; 324. Connecting bolt; 325. Threaded sleeve; 326. Positioning bolt; 33. Heating coil. Detailed implementation mode

[0021] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] During specific implementation: As Figures 1-4 shown, an ultrasonic-assisted vacuum brazing device includes: a vacuum chamber 1, a heater 2 is fixedly connected to the lower end of the vacuum chamber 1, an ultrasonic horn 11 is installed at the upper end of the vacuum chamber 1, the lower end of the ultrasonic horn 11 extends into the interior of the vacuum chamber 1, and an operation port 12 is installed on the side of the vacuum chamber 1; wherein, the brazing mechanism 3 includes a heating coil 33 installed on the bottom wall of the vacuum chamber 1, workpiece fitting assemblies 31 are respectively arranged on both sides of the heating coil 33, the workpiece fitting assemblies 31 are installed on the inner wall of the vacuum chamber 1, and a workpiece positioning assembly 32 is arranged on the surface of the workpiece fitting assemblies 31;

[0023] As Figures 1-4 shown, the workpiece fitting assembly 31 includes a guide rail 311 fixedly connected to the inner bottom wall of the vacuum chamber 1, a positioning frame 312 is fixedly connected to the side of the guide rail 311 away from the operation port 12, the positioning frame 312 is fixedly connected to the inner wall of the vacuum chamber 1, a sliding seat 313 is slidably connected to the side of the guide rail 311 away from the positioning frame 312, a threaded rod 314 is arranged inside the sliding seat 313, the threaded rod 314 is rotatably connected to the inner wall of the vacuum chamber 1, a threaded tube 316 is fixedly connected to the inner wall of the sliding seat 313, the threaded tube 316 is threadedly connected to the surface of the threaded rod 314, an operation knob 315 is fixedly connected to the upper end of the threaded rod 314, and a chute 317 is opened on the side of the sliding seat 313 close to the guide rail 311, and the chute 317 is slidably connected to the inner wall of the guide rail 311;

[0024] When in use, two workpieces to be brazed can be placed inside the workpiece positioning assembly 32. The two workpieces to be brazed and the brazing filler metal are clamped by the workpiece fitting assemblies 31 on both sides. Then, the manual knob can be operated to rotate the knob 315. When the knob 315 rotates, the threaded rod 314 will rotate synchronously. Then, under the cooperation of the threaded connection between the threaded tube 316 and it, the sliding seat 313 can be driven to move synchronously. Among them, under the cooperation of the guiding track 311 and the sliding groove 317, the sliding seat 313 can maintain the effect of stable vertical movement. And under the combined action of the guiding track 311 and the positioning frame 312, the stable supporting state of the guiding track 311 is maintained;

[0025] As Figure 1 , Figure 2 and Figure 4 shown, the workpiece positioning assembly 32 includes a placement frame 321 installed on the side of the sliding seat 313 away from the guiding track 311. Both sides of the placement frame 321 are fixedly connected with positioning side plates 322. The positioning side plates 322 are slidably connected to one side of the sliding seat 313. A threaded counterbore 323 is opened on one side of the positioning side plate 322, and the threaded counterbore 323 penetrates into the adjacent interior of the sliding seat 313. A connecting bolt 324 is threadedly connected to the inner wall of the threaded counterbore 323. During induction brazing, the length of the ultrasonic horn 11 is adjusted so that the end of the ultrasonic horn 11 contacts the surface of the placement frame 321. The longitudinal section of the placement frame 321 is in a C shape. A threaded sleeve 325 is fixedly connected to the upper end of the placement frame 321. The lower end of the threaded sleeve 325 penetrates into the inner side of the placement frame 321. A positioning bolt 326 is threadedly connected to the inner wall of the threaded sleeve 325, and the lower end of the positioning bolt 326 extends into the inner side of the placement frame 321;

[0026] By placing the brazing workpiece inside the placement frame 321, through the cooperation of the two positioning bolts 326 and the threaded sleeve 325, the positioning bolt 326 can be manually rotated. Under the action of the threaded sleeve 325, the lower end of the positioning bolt 326 positions the upper ends of the workpiece to be brazed and the brazing filler metal. The device maintains the positioning effect on the placement frame 321 through the positioning side plates 322 on both sides. Among them, the connecting bolt 324 penetrates into the interior of the threaded counterbore 323, and under the action of its threaded connection, the positioning side plate 322 is positioned on the side of the sliding seat 313, achieving the effect of maintaining the stable position of the placement frame 321 and positioning and clamping the workpiece to be brazed.

[0027] When the utility model is in use, the workpiece to be welded is placed inside the placement frame 321. The positioning bolt 326 manually rotated and the threaded sleeve 325 threadedly connected thereto will cause the lower end of the positioning bolt 326 to have a pressure contact with the upper end of the welding material. The positioning side plates 322 on both sides maintain the positioning effect on the placement frame 321. The connecting bolt 324 penetrates into the internal threaded counterbore 323, and the positioning side plates 322 position the side surface of the sliding seat 313, achieving the effect of maintaining the stable position of the placement frame 321. Then, the operating knob 315 is manually rotated. When the operating knob 315 rotates, it drives the threaded rod 314 to rotate synchronously. Under the cooperation of the threaded connection between the threaded tube 316 and the threaded rod 314, the sliding seat 313 is driven to move synchronously. Among them, under the cooperation of the guiding track 311 and the sliding groove 317, the sliding seat 313 maintains the effect of stable vertical movement. Moreover, under the combined action of the guiding track 311 and the positioning frame 312, the stable supporting state of the guiding track 311 is maintained. Thus, during the adjustment process, the two workpieces to be welded can be mutually attached to form a suitable-sized brazing seam gap.

[0028] In addition, it should be understood that although this specification is described according to the embodiments, not each embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An ultrasonic-assisted vacuum brazing device, characterized in that, Comprising: A vacuum chamber (1), a heater (2) is fixedly connected to the lower end of the vacuum chamber (1), an ultrasonic horn (11) is installed at the upper end of the vacuum chamber (1), the lower end of the ultrasonic horn (11) extends into the interior of the vacuum chamber (1), and an operation port (12) is installed on the side of the vacuum chamber (1); A brazing mechanism (3), the brazing mechanism (3) is installed inside the vacuum chamber (1); Wherein, the brazing mechanism (3) includes a heating coil (33) installed on the bottom wall of the vacuum chamber (1), welding part fitting assemblies (31) are respectively arranged on both sides of the heating coil (33), the welding part fitting assemblies (31) are installed on the inner wall of the vacuum chamber (1), and a welding part positioning assembly (32) is arranged on the surface of the welding part fitting assemblies (31).

2. The ultrasonic-assisted vacuum brazing device according to claim 1, wherein: The welding part fitting assembly (31) includes a guiding track (311) fixedly connected to the inner bottom wall of the vacuum chamber (1), a positioning frame (312) is fixedly connected to the side of the guiding track (311) away from the operation port (12), the positioning frame (312) is fixedly connected to the inner wall of the vacuum chamber (1), a sliding seat (313) is slidably connected to the side of the guiding track (311) away from the positioning frame (312), a threaded rod (314) is arranged inside the sliding seat (313), and the threaded rod (314) is rotatably connected to the inner wall of the vacuum chamber (1); The welding part positioning assembly (32) includes a placement frame (321) installed on the side of the sliding seat (313) away from the guiding track (311), positioning side plates (322) are fixedly connected to both sides of the placement frame (321), the positioning side plates (322) are slidably connected to one side of the sliding seat (313), a threaded counterbore (323) is formed on one side of the positioning side plate (322) and penetrates through to the inside of the adjacent sliding seat (313), a connecting bolt (324) is threadedly connected to the inner wall of the threaded counterbore (323), and during induction brazing, the length of the ultrasonic horn (11) is adjusted so that the end of the ultrasonic horn (11) contacts the surface of the placement frame (321).

3. An ultrasonic-assisted vacuum brazing device according to claim 2, characterized in that: A threaded tube (316) is fixedly connected to the inner wall of the sliding seat (313), the threaded tube (316) is threadedly connected to the surface of the threaded rod (314), and an operation knob (315) is fixedly connected to the upper end of the threaded rod (314).

4. An ultrasonic-assisted vacuum brazing device according to claim 2, characterized in that: A chute (317) is formed on the side of the sliding seat (313) close to the guiding track (311), and the chute (317) is slidably connected to the inner wall of the guiding track (311).

5. The ultrasonic-assisted vacuum brazing device according to claim 2, wherein: The longitudinal section of the placement frame (321) is C-shaped, a threaded sleeve (325) is fixedly connected to the upper end of the placement frame (321), and the lower end of the threaded sleeve (325) penetrates through to the inside of the placement frame (321).

6. The ultrasonic-assisted vacuum brazing device according to claim 5, characterized in that: A positioning bolt (326) is threadedly connected to the inner wall of the threaded sleeve (325), and the lower end of the positioning bolt (326) extends into the inside of the placement frame (321).

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