Multi-section sheet metal part brazing forming method

Abstract

The invention discloses a brazing forming method for a multi-section sheet metal part. The brazing forming method comprises the following steps that (1) positioning argon arc welding is conducted; 2) positioning electric resistance welding; (3) prefabricating brazing filler metal; 4) drying; and 5) vacuum brazing. The forming method is convenient to operate and accurate in positioning, accurate welding of the multiple sections of sheet metal parts is guaranteed, the welding quality is guaranteed, and the welding efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of parts welding, and in particular to a brazing forming method for multi-section sheet metal parts. Background Art

[0002] like Figure 2 and Figure 3 The combustion chamber outer wall shown is an important part of the engine, and during processing, it is necessary to complete the welding of multiple inner ring plates inside it. The inner ring plate is an annular sheet metal part. Since there are many inner ring plates to be welded, a problem in the welding of one of them will cause the entire part to be scrapped. Therefore, the existing welding solution cannot guarantee the welding quality for the welding of the above-mentioned multiple sheet metal parts, and the welding efficiency is low. Summary of the invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a method for brazing and forming multi-section sheet metal parts, which is convenient to operate and has accurate positioning, ensures accurate welding of multi-section sheet metal parts, guarantees welding quality, and has high welding efficiency.

[0004] The present invention provides a method for brazing a multi-section sheet metal part, comprising the following steps:

[0005] 1) Positioning argon arc welding: use the positioning tool to position each inner ring plate and the outer wall of the combustion chamber from top to bottom one by one, and fix them by argon arc spot welding;

[0006] 2) Positioning resistance welding: spot welding and reinforcement between each inner ring plate and the outer wall of the combustion chamber is performed by resistance welding;

[0007] 3) Prefabricate the brazing filler metal and pre-place the brazing filler metal into the weld between each inner ring plate and the outer wall of the combustion chamber by means of a brazing filler pre-placer;

[0008] 4) Drying: Drying the pre-set solder to remove moisture from the solder;

[0009] 5) Vacuum brazing: clamp and support the outer wall of the combustion chamber through the support tooling, and put the outer wall of the combustion chamber and the support tooling into the vacuum brazing equipment for vacuum brazing.

[0010] Furthermore, the positioning tooling includes a first bottom plate, a first center column and a limit plate;

[0011] The top surface of the first bottom plate is provided with a positioning step for positioning and supporting the inner ring plate at the bottom of the outer wall of the combustion chamber, and the outer diameter of the positioning step is in clearance with the inner diameter of the bottom end of the outer wall of the combustion chamber;

[0012] The first center column is fixedly disposed concentrically on the top surface of the positioning step, and the side wall of the first center column is provided with a plurality of supporting steps with decreasing outer diameters from bottom to top;

[0013] The limiting plates are sleeved on the supporting steps in a one-to-one correspondence, and are respectively used to position and support the inner ring plates at different positions in the outer wall of the combustion chamber.

[0014] Furthermore, a first limiting plane is respectively arranged on one side of each positioning step; a through hole adapted to the corresponding supporting step is opened on the limiting plate, and a second limiting plane adapted to the corresponding first limiting plane is arranged on one side of the through hole.

[0015] Furthermore, the positioning tool is made of stainless steel.

[0016] Furthermore, the solder presetter includes a barrel, the bottom end of which is connected to a slender injection tube, a piston rod is inserted into the top end of the barrel, the bottom end of the piston rod is fixedly connected to an injection piston, the top end of the piston rod is fixedly connected to an end cap, and a limiting ring is fixedly provided on the inner periphery of the top end of the barrel.

[0017] Furthermore, the bottom end of the injection tube is bent to one side by 30°-50°.

[0018] Further, the supporting tooling includes a second bottom plate, a second center column and a cover plate;

[0019] The top surface of the second bottom plate is provided with a lower supporting step;

[0020] The second center column is fixedly disposed concentrically on the top surface of the lower support step, and a threaded hole is concentrically disposed on the top end of the second center column;

[0021] The bottom surface of the cover plate is provided with an upper supporting step, and the cover plate and the upper supporting step are provided with through holes, the through holes are concentric with the upper supporting step, and the screws pass through the through holes and are threadedly connected with the threaded holes;

[0022] Among them, the outer diameter of the lower supporting step is matched with the inner diameter clearance of the bottom end of the outer wall of the combustion chamber, and the outer diameter of the upper supporting step is matched with the inner diameter clearance of the top end of the outer wall of the combustion chamber; or the outer diameter of the lower supporting step is matched with the inner diameter clearance of the top end of the outer wall of the combustion chamber, and the outer diameter of the upper supporting step is matched with the inner diameter clearance of the bottom end of the outer wall of the combustion chamber.

[0023] Furthermore, the supporting tooling is made of stainless steel.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The brazing forming method of the present invention first positions each inner ring plate and the outer wall of the combustion chamber one by one from top to bottom through a positioning tool, and fixes them through argon arc spot welding; then spot welding is reinforced through resistance welding; then the brazing material is preset through a brazing material presetter; then the preset brazing material is dried; finally, the outer wall of the combustion chamber is clamped and supported by a supporting tool, thereby completing vacuum brazing. The forming method of the present application is convenient to operate, accurate in positioning, ensures accurate welding of multiple sections of sheet metal parts, guarantees welding quality, completes vacuum brazing of multiple sections of sheet metal parts at one time, and has high welding efficiency.

[0026] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 It is a flow chart of a method for brazing and forming a multi-section sheet metal part;

[0029] Figure 2 It is a schematic diagram of the cross-sectional structure of the outer wall of the combustion chamber;

[0030] Figure 3 It is a schematic diagram of the structure of the outer wall and inner ring plate of the combustion chamber;

[0031] Figure 4 It is a structural schematic diagram of the positioning tooling;

[0032] Figure 5 It is a schematic diagram of the cross-sectional structure of the positioning tooling;

[0033] Figure 6 This is a schematic diagram of the exploded structure of the positioning tooling;

[0034] Figure 7 It is a structural schematic diagram of a solder presetter;

[0035] Figure 8 It is a schematic diagram of the cross-sectional structure of the solder presetter;

[0036] Fig. 9 It is a schematic diagram of the structure of the supporting tooling;

[0037] Fig.10 Schematic diagram of the cross-sectional structure of the supporting tooling.

[0038] Numbers in the figure: 1. Outer wall of combustion chamber; 2. Inner ring plate; 3. Positioning fixture; 4. Brazing material presetter; 5. Support fixture;

[0039] 31. first bottom plate; 32. first center column; 33. limiting plate; 34. positioning step; 35. supporting step; 36. first limiting plane; 37. through hole; 38. second limiting plane;

[0040] 41. barrel; 42. injection tube; 43. piston rod; 44. injection piston; 45. end cap; 46. limit ring;

[0041] 51. Second base plate; 52. Second center column; 53. Cover plate; 54. Lower supporting step; 55. Threaded hole; 56. Upper supporting step; 57. Through hole; 58. Screw. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] Please refer to Figures 1 to 10 The embodiment of the present invention provides a method for brazing a multi-section sheet metal part, comprising the following steps:

[0045] 1) Positioning argon arc welding: use the positioning tool 3 to position each inner ring plate 2 and the outer wall 1 of the combustion chamber from top to bottom one by one, and fix them by argon arc spot welding;

[0046] 2) Positioning resistance welding, spot welding and reinforcement between each inner ring plate 2 and the outer wall 1 of the combustion chamber by resistance welding;

[0047] 3) Prefabricate the brazing material, and pre-place the brazing material into the weld between each inner ring plate 2 and the outer wall 1 of the combustion chamber by means of a brazing material pre-placer 4;

[0048] 4) Drying: Drying the pre-set solder to remove moisture from the solder;

[0049] 5) Vacuum brazing: The outer wall 1 of the combustion chamber is clamped and supported by the supporting fixture 5, and the outer wall 1 of the combustion chamber and the supporting fixture 5 are placed in a vacuum brazing device for vacuum brazing.

[0050] In this embodiment, when vacuum brazing the outer wall 1 of the combustion chamber and the inner ring plate 2 is performed, the inner ring plate 2 and the outer wall 1 of the combustion chamber are first positioned one by one from top to bottom by the positioning tool 3, and fixed by argon arc welding. The argon arc welding strength is relatively low, but the welding process is gentle, which greatly avoids the problem of misalignment between the inner ring plate 2 and the outer wall 1 of the combustion chamber caused by welding; then, spot welding is performed by resistance welding to reinforce, which makes up for the problem of insufficient strength of argon arc welding, and because it has been fixed by argon arc welding spot welding, resistance welding will not cause the problem of misalignment between the inner ring plate 2 and the outer wall 1 of the combustion chamber;

[0051] Then, the brazing material is preset by the brazing material presetter, ensuring that the brazing material is accurately and conveniently injected into the weld between the inner ring plate 2 and the outer wall 1 of the combustion chamber; the preset brazing material is then dried to remove the moisture in the brazing material, thus avoiding the rapid evaporation of the moisture in the brazing material during the high-temperature brazing process, resulting in bubbles, splashes, etc., which seriously affect the quality and strength of the weld. This ensures the stability of the brazing process and improves the quality and strength of the weld;

[0052] Finally, the top and bottom of the outer wall 1 of the combustion chamber are clamped and supported by the supporting tool 5, thereby completing the vacuum brazing. The concentricity of the top and bottom of the outer wall 1 of the combustion chamber is ensured, and the roundness of the outer wall 1 of the combustion chamber is ensured, which greatly avoids the problem of deformation of the outer wall 1 of the combustion chamber during the welding process.

[0053] The forming method of the present application is convenient to operate and has accurate positioning, which ensures accurate welding of multiple sections of sheet metal parts, guarantees welding quality, completes vacuum brazing of multiple sections of sheet metal parts at one time, and has high welding efficiency.

[0054] In a preferred embodiment, if Figures 4 to 6 As shown, the positioning tool 3 includes a first bottom plate 31, a first center column 32 and a limiting plate 33;

[0055] The top surface of the first bottom plate 31 is provided with a positioning step 34 for positioning and supporting the inner ring plate 2 at the bottom of the outer wall 1 of the combustion chamber. The outer diameter of the positioning step 34 is in clearance with the inner diameter of the bottom end of the outer wall 1 of the combustion chamber.

[0056] The first center column 32 is fixedly disposed concentrically on the top surface of the positioning step 34, and the side wall of the first center column 32 is provided with a plurality of supporting steps 35 with decreasing outer diameters from bottom to top;

[0057] The limiting plates 33 are sleeved on the supporting steps 35 in a one-to-one correspondence, and are respectively used to position and support the inner ring plates 2 at different positions in the outer wall 1 of the combustion chamber.

[0058] In this embodiment, when performing argon arc welding, firstly, the uppermost limiting plate 33 is sleeved on the corresponding supporting step 35, and the other limiting plates 33 are not installed; then, the uppermost inner ring plate 2 is placed inside the outer wall 1 of the combustion chamber, and the outer wall 1 of the combustion chamber is sleeved on the positioning fixture 3; the positioning step 34 is embedded in the bottom end of the outer wall 1 of the combustion chamber to position the axial direction of the outer wall 1 of the combustion chamber, and the limiting plate 33 is supported on the bottom of the inner ring plate 2 to position it, and then argon arc spot welding can be performed to fix it;

[0059] Then remove the combustion chamber outer wall 1, and check the position between the combustion chamber outer wall 1 and the spot-welded inner ring plate 2; after the position is qualified, assemble the second limit plate 33 from top to bottom to the first center column 32 separately, and complete the spot welding of the corresponding inner ring plate 2, and then perform the corresponding position detection; in this way, the spot welding of each inner ring plate 2 is completed one by one from top to bottom. The operation is convenient and the spot welding positioning effect is good.

[0060] In a preferred embodiment, if Figure 5 As shown, a first limiting plane 36 is provided on one side of each positioning step 35; a through hole 37 matching the corresponding support step 35 is provided on the limiting plate 33, and a second limiting plane 38 matching the corresponding first limiting plane 36 is provided on one side of the through hole 37. After the limiting plate 33 is assembled on the corresponding support step 35, the first limiting plane 36 cooperates with the second limiting plane 38 to prevent the limiting plate 33 from rotating, thereby improving the stability of the positioning support of the limiting plate 33.

[0061] In a preferred embodiment, the positioning tool 3 is made of stainless steel, which has high structural strength, is not easy to deform, corrode or rust, and has a long service life.

[0062] In a preferred embodiment, if Figure 7 and Figure 8 As shown, the solder presetter 4 includes a barrel 41, the bottom end of which is connected to a slender injection tube 42, the top end of which is inserted with a piston rod 43, the bottom end of which is fixedly connected to an injection piston 44, the top end of which is fixedly connected to an end cap 45, and the inner periphery of the top end of the barrel 41 is fixedly provided with a limiting ring 46.

[0063] In this embodiment, when presetting the paste solder, it is first sucked into the barrel 41, then the injection tube 42 is aligned with the solder presetting position, and the piston rod 43 is slowly pushed to inject the solder into the weld between the inner ring plate 2 and the outer wall 1 of the combustion chamber. The injection is convenient and the injection amount is easy to control, thereby ensuring the welding quality.

[0064] In a preferred embodiment, if Figure 7 and Figure 8 As shown, the bottom end of the injection tube is bent to one side by 30°-50°, thereby improving the convenience of solder presetting.

[0065] In a preferred embodiment, if Fig. 9 and Fig.10 As shown, the supporting tool 5 includes a second bottom plate 51, a second center column 52 and a cover plate 53;

[0066] The top surface of the second bottom plate 51 is provided with a lower support step 54;

[0067] The second center column 52 is fixedly disposed concentrically on the top surface of the lower support step 54, and a threaded hole 55 is concentrically disposed on the top of the second center column 52;

[0068] An upper support step 56 is provided on the bottom surface of the cover plate 53. A through hole 57 is provided on the cover plate 53 and the upper support step 56. The through hole 57 is concentric with the upper support step 56. A screw 58 passes through the through hole 57 and is threadedly connected with the threaded hole 55.

[0069] Among them, the outer diameter of the lower supporting step 54 is matched with the inner diameter clearance of the bottom end of the outer wall 1 of the combustion chamber, and the outer diameter of the upper supporting step 56 is matched with the inner diameter clearance of the top end of the outer wall 1 of the combustion chamber; or the outer diameter of the lower supporting step 54 is matched with the inner diameter clearance of the top end of the outer wall 1 of the combustion chamber, and the outer diameter of the upper supporting step 56 is matched with the inner diameter clearance of the bottom end of the outer wall 1 of the combustion chamber.

[0070] In this embodiment, when the outer wall 1 of the combustion chamber is clamped and supported, its top or bottom end is firstly put on the lower support step 54, and then the cover plate 53 is fixedly installed to the top of the second center column 52 by screws 58, so that the upper support step 56 is embedded in the bottom or top end of the outer wall 1 of the combustion chamber, forming a positioning support for the bottom and top ends of the outer wall 1 of the combustion chamber, ensuring the concentricity of the top and bottom ends of the outer wall 1 of the combustion chamber, ensuring the roundness of the outer wall 1 of the combustion chamber, and greatly avoiding the problem of deformation of the outer wall 1 of the combustion chamber during welding, thereby ensuring the welding quality.

[0071] In a preferred embodiment, the supporting tooling 5 is made of stainless steel, which has high structural strength, is not easy to deform, corrode, and rust, and has a long service life.

[0072] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] In the description of this specification, the description of the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for brazing a multi-section sheet metal part, characterized in that: The steps include: 1) Positioning argon arc welding, positioning each inner ring plate (2) and the outer wall (1) of the combustion chamber one by one from top to bottom by means of a positioning tool (3), and fixing them by argon arc spot welding; 2) Positioning resistance welding, spot welding and reinforcement between each inner ring plate (2) and the outer wall (1) of the combustion chamber by resistance welding; 3) prefabricating the brazing filler metal, and presetting the brazing filler metal into the weld between each inner ring plate (2) and the outer wall (1) of the combustion chamber by means of a brazing filler presetting device (4); 4) Drying: Drying the pre-set solder to remove moisture from the solder; 5) Vacuum brazing: the outer wall (1) of the combustion chamber is clamped and supported by a supporting tool (5), and the outer wall (1) of the combustion chamber and the supporting tool (5) are placed together in a vacuum brazing device for vacuum brazing.

2. The method for brazing a multi-segment sheet metal part according to claim 1, characterized in that: The positioning tool (3) comprises a first bottom plate (31), a first central column (32) and a limiting plate (33); The top surface of the first bottom plate (31) is provided with a positioning step (34) for positioning and supporting the inner ring plate (2) at the bottom of the outer wall (1) of the combustion chamber, and the outer diameter of the positioning step (34) is in clearance with the inner diameter of the bottom end of the outer wall (1) of the combustion chamber; The first center column (32) is fixedly disposed concentrically on the top surface of the positioning step (34), and the side wall of the first center column (32) is provided with a plurality of supporting steps (35) with decreasing outer diameters from bottom to top; The limiting plates (33) are sleeved on the supporting steps (35) in a one-to-one correspondence, and are respectively used to position and support the inner ring plates (2) at different positions in the outer wall (1) of the combustion chamber.

3. The method for brazing a multi-segment sheet metal part according to claim 2, characterized in that: A first limiting plane (36) is provided on one side of each positioning step (34); a through hole (37) adapted to the corresponding supporting step (34) is provided on the limiting plate (33); and a second limiting plane (38) adapted to the corresponding first limiting plane (36) is provided on one side of the through hole (37).

4. The method for brazing a multi-section sheet metal part according to claim 2, characterized in that: The positioning tool (3) is made of stainless steel.

5. The method for brazing a multi-segment sheet metal part according to claim 1, characterized in that: The solder presetter (4) comprises a barrel (41), the bottom end of the barrel (41) is connected to a slender injection tube (42), the top end of the barrel (41) is inserted with a piston rod (43), the bottom end of the piston rod (43) is fixedly connected to an injection piston (44), the top end of the piston rod (43) is fixedly connected to an end cap (45), and a limit ring (46) is fixedly provided on the inner periphery of the top end of the barrel (41).

6. The method for brazing a multi-section sheet metal part according to claim 5, characterized in that: The bottom end of the injection pipe (42) is bent to one side by 30°-50°.

7. The method for brazing a multi-segment sheet metal part according to claim 1, characterized in that: The supporting tool (5) comprises a second bottom plate (51), a second central column (52) and a cover plate (53); The top surface of the second bottom plate (51) is provided with a lower supporting step (54); The second center column (52) is fixedly disposed concentrically on the top surface of the lower support step (54), and a threaded hole (55) is concentrically disposed on the top end of the second center column (52); The bottom surface of the cover plate (53) is provided with an upper supporting step (56), the cover plate (51) and the upper supporting step (56) are provided with a through hole (57), the through hole (57) is concentric with the upper supporting step (56), and a screw (58) passes through the through hole (57) and is threadedly connected to the threaded hole (55); The outer diameter of the lower support step (54) is in clearance with the inner diameter of the bottom end of the outer wall (1) of the combustion chamber, and the outer diameter of the upper support step (56) is in clearance with the inner diameter of the top end of the outer wall (1) of the combustion chamber; or the outer diameter of the lower support step (54) is in clearance with the inner diameter of the top end of the outer wall (1) of the combustion chamber, and the outer diameter of the upper support step (56) is in clearance with the inner diameter of the bottom end of the outer wall (1) of the combustion chamber.

8. The method for brazing a multi-segment sheet metal part according to claim 7, characterized in that: The supporting tooling (5) is made of stainless steel.

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