CN109877410B - Manufacturing method of double-cavity structure with thin-wall cooling flow channel - Google Patents
Manufacturing method of double-cavity structure with thin-wall cooling flow channel Download PDFInfo
- Publication number
- CN109877410B CN109877410B CN201910175049.3A CN201910175049A CN109877410B CN 109877410 B CN109877410 B CN 109877410B CN 201910175049 A CN201910175049 A CN 201910175049A CN 109877410 B CN109877410 B CN 109877410B
- Authority
- CN
- China
- Prior art keywords
- thin
- wall cooling
- assembly
- cover plate
- cooling flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a manufacturing method of a double-cavity structure with a thin-wall cooling flow channel, which comprises the steps of firstly, mounting a first pre-assembly of the double-cavity structure, uniformly coating paste-shaped brazing filler metal on the surface of a pairwise joint of the first pre-assembly, and then carrying out first vacuum brazing to form a first assembly; and then, mounting a second pre-assembly on the first assembly and the upper cover plate, and carrying out second vacuum brazing on the second pre-assembly coated with the paste brazing filler metal to form a second assembly. The invention can realize the manufacture of the double-cavity structure with the thin-wall cooling flow channel by twice pre-assembly installation and twice vacuum brazing, and can meet the working condition application under special environmental conditions.
Description
Technical Field
The invention belongs to the field of aerospace, and particularly relates to a manufacturing method of a double-cavity structure with a thin-wall cooling flow channel.
Background
The double-cavity structure with the thin-wall cooling flow channel is a three-layer double-cavity cylindrical structure which is respectively composed of a high-temperature-resistant upper cover plate, a stainless steel middle-layer partition plate and a stainless steel lower cover plate, the diameter of the double-cavity cylindrical structure is larger than or equal to 600mm, at least 20 thin-wall cooling pipelines with the diameter of 30mm are uniformly distributed on the plane of the cylinder, absolute sealing is required between the upper cavity and the lower cavity of the structure, and the double-cavity structure is mainly used for harsh working conditions of high temperature resistance (higher than 1000 ℃) and high pressure resistance (higher than 100 MPa).
At present, the manufacturing method of the double-cavity structure with the thin-wall cooling flow channel mainly comprises welding and 3D printing processes. Because the structure is a double-layer absolute sealing cavity body structure, a large number of thin-wall cooling pipelines exist, the number of joints is large, the processes of conventional resistance welding, fusion welding (argon arc welding, laser welding, plasma welding, electron beam welding) and the like cannot ensure absolute sealing and control the thermal deformation of the thin-wall cooling pipelines, and the technical requirements cannot be met; certain pressure needs to be applied to the joint parts in the implementation process of diffusion welding, so that great difficulty is brought to the application of pressure to a large number of joint parts, and the technical requirement on absolute sealing is difficult to achieve; when the brazing is carried out in the atmosphere, an anti-oxidation brazing flux needs to be added, the influence on a thin-wall pipeline is easily caused, and the local high-temperature stress of the assembly is difficult to eliminate to generate cracks. The laser selective 3D printing process cannot realize precise printing of parts made of different materials under the current technical level, has stress deformation, is immature in process and high in cost when the parts with the diameter larger than or equal to 600mm are subjected to 3D printing.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for manufacturing a double-cavity structure with a thin-wall cooling flow channel.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method of making a dual cavity structure with thin wall cooling channels, said method comprising the steps of:
(1) placing a lower cover plate into a structural body provided with a middle layer clapboard, forming a lower cavity together with the structural body and the middle layer clapboard, and assembling a first pre-assembly after the lower ends of a plurality of thin-wall cooling runners with the wall thickness less than or equal to 2.5mm sequentially penetrate through the middle layer clapboard and the lower cover plate; uniformly coating and injecting paste-shaped brazing filler metal on the surface of the joint of every two parts of the first pre-assembly;
(2) pressing and fixing the first pre-assembly coated with the paste brazing filler metal by using a fixing tool, then carrying out first vacuum brazing under the conditions that the vacuum degree is 0.008-40Pa and the brazing temperature is 800-1100 ℃, and removing the fixing tool after the brazing time is 40-60min to obtain a first assembly with a sealed lower chamber;
(3) placing an upper cover plate into a structural body of the first assembly, forming an upper cavity together with the structural body and the middle-layer partition plate, and sequentially penetrating the upper ends of the thin-wall cooling flow channels through the middle-layer partition plate and the structural body to form a second pre-assembly; uniformly coating and injecting paste-shaped brazing filler metal on the surfaces of the pairwise joints of the parts of the second pre-assembly;
(4) and (3) after the second pre-assembly coated with the paste brazing filler metal is pressed and fixed by a fixing tool, carrying out second vacuum brazing under the conditions that the vacuum degree is 0.008-40Pa and the brazing temperature is 800-1080 ℃, removing the fixing tool after 40-60min of brazing, and finishing the sealing of the upper chamber to obtain the double-cavity structure with the thin-wall cooling flow channel.
Furthermore, the double-cavity structure comprises a cylindrical upper cavity and a cylindrical lower cavity, and the diameters of the upper cavity and the lower cavity are not less than 600 mm.
Furthermore, the structural body is of a cylindrical structure, and the upper cover plate is a circular upper cover plate matched with the cylindrical structure; the lower cover plate is a circular lower cover plate matched with the cylindrical structure; the thin-wall cooling flow channel adopts cylindrical thin-wall cooling pipelines, and the number of the thin-wall cooling flow channels is not less than 20.
Furthermore, the structural body, the lower cover plate and the thin-wall cooling flow channel are all made of stainless steel materials; the upper cover plate is made of high-temperature-resistant alloy materials.
Furthermore, the structure body is provided with an upper boss for placing an upper cover plate and a lower boss for placing a lower cover plate on the two sides of the top and the bottom of the middle layer partition plate respectively, and the upper boss, the lower boss, the middle layer partition plate and the structure body are of an integrated structure.
Furthermore, the thin-wall cooling flow channel penetrates through the upper chamber and the lower chamber through mounting holes which are respectively formed in the upper cover plate, the middle-layer partition plate and the lower cover plate; the mounting hole is matched with the thin-wall cooling flow channel structure, and the mounting gap between the mounting hole and the single side of the thin-wall cooling flow channel is 0.02-0.06 mm.
Furthermore, the joint of each two of the first pre-assemblies comprises an installation gap between the thin-wall cooling flow channel and an installation hole of the lower cover plate, an installation gap between the thin-wall cooling flow channel and an installation hole of the middle-layer clapboard, and an installation gap between the lower cover plate and the structural body; the joint of every two of the second pre-assemblies comprises an installation gap between the thin-wall cooling flow channel and an installation hole of the upper cover plate, an installation gap between the thin-wall cooling flow channel and an installation hole of the middle-layer partition plate and an installation gap between the upper cover plate and the structural body.
Further, the paste brazing filler metal is prepared by blending a binder and a powdery brazing filler metal in a mass ratio of 1: 4.
Furthermore, the upper end of the thin-wall cooling flow channel is flush with the top of the upper cover plate, and the lower end of the thin-wall cooling flow channel extends out of the lower cover plate;
the fixing tool comprises an upper fixing plate and a lower fixing plate; when the first pre-assembly or the second pre-assembly is fixed between the upper fixing plate and the lower fixing plate through the fasteners, two ends of the thin-wall cooling flow channel and the top and the bottom of the middle-layer partition plate respectively abut against the upper fixing plate and the lower fixing plate; the fasteners are assembled on two sides of the upper fixing plate and the lower fixing plate, and two ends of the thin-wall cooling flow channel and the top and the bottom of the middle-layer partition plate respectively abut against the upper fixing plate and the lower fixing plate.
Further, the first component and the second component need to be subjected to tightness inspection before the step and after the second vacuum brazing respectively; the tightness test comprises a hydrostatic test.
Has the advantages that: compared with the prior art, the method comprises the steps of firstly installing the first pre-assembly with the double-cavity structure, uniformly coating paste-shaped brazing filler metal on the surface of the joint of every two of the first pre-assembly, and then carrying out first vacuum brazing; then, mounting a second pre-assembly on the first assembly, and carrying out second vacuum brazing on the second pre-assembly coated with the paste brazing filler metal; the manufacturing of the upper and lower chambers of the double-cavity structure is realized through twice pre-assembly installation and twice vacuum brazing, and the manufactured upper and lower chambers are kept for 10min without leakage when the water pressure is 4MPa through a water pressure test, which shows that the upper and lower chambers of the double-cavity structure manufactured by the manufacturing method of the invention have good sealing performance; secondly, the paste-shaped brazing filler metal is used for coating and injecting the outer surface of the joint to ensure the coating uniformity of the brazing filler metal and the quality of a welding seam, so that the sealing performance of the upper chamber and the lower chamber is ensured; and finally, fixing the first pre-assembly or the second pre-assembly by a fixing tool during vacuum brazing, so that the first pre-assembly or the second pre-assembly can be integrally heated and brazed during vacuum brazing, and each point of the first pre-assembly or the second pre-assembly is heated at a constant temperature and synchronously shrunk and deformed.
Drawings
FIG. 1 is a schematic structural view of a dual cavity structure with thin wall cooling channels according to the present invention;
FIG. 2 is a schematic view of a first assembly brazing of a dual cavity structure with thin wall cooling channels according to the present invention;
FIG. 3 is a schematic view of a second assembly brazing of a dual cavity structure with thin wall cooling channels according to the present invention.
In the figure: 1-upper cover plate, 2-structural body, middle layer partition plate, 3-lower cover plate, 4-thin wall cooling flow channel, 5-upper fixing plate, 6-lower fixing plate, 7-fastening piece, 8-middle layer partition plate, 9-upper boss and 10-lower boss.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, which are merely for convenience of description and simplification of description, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
Firstly, mounting a first pre-assembly with a double-cavity structure, uniformly coating paste-shaped brazing filler metal at the joint of every two pre-assemblies, and then carrying out first vacuum brazing; then, mounting a second pre-assembly on the first assembly, and carrying out second vacuum brazing on the second pre-assembly coated with the paste brazing filler metal; the manufacturing of the upper and lower chambers of the double-cavity structure is realized through twice pre-assembly installation and twice vacuum brazing, and the manufactured upper and lower chambers are kept for 10min without leakage when the water pressure is 4MPa through a water pressure test, which shows that the upper and lower chambers of the double-cavity structure manufactured by the manufacturing method of the invention have good sealing performance; secondly, the paste brazing filler metal is used for coating and injecting the outer surface of the joint, so that the coating uniformity of the brazing filler metal at the joint is ensured, the quality of a welding seam is ensured, and the sealing performance of the upper chamber and the lower chamber is further ensured; and finally, fixing the first pre-assembly or the second pre-assembly by a fixing tool during vacuum brazing, so that the first pre-assembly or the second pre-assembly can be integrally heated and brazed during vacuum brazing, and each point of the first pre-assembly or the second pre-assembly is heated at a constant temperature and synchronously shrunk and deformed.
The invention is further elucidated with reference to the figures and embodiments.
Example 1
Referring to fig. 1-3, a method of fabricating a dual cavity structure with thin wall cooling channels, the method comprising the steps of:
(1) placing the lower cover plate 2 into the structural body 3 provided with the middle-layer partition plate 8, forming a lower cavity together with the middle-layer partition plate 8 and the structural body 3, and sequentially penetrating the lower ends of a plurality of thin-wall cooling flow channels 4 with the wall thickness less than or equal to 2.5mm through the middle-layer partition plate 8 and the lower cover plate 2 to assemble a first pre-assembly; the thin-wall cooling flow passages 4 are uniformly distributed on the lower cover plate 2; uniformly coating and injecting paste-shaped brazing filler metal on the surface of the joint of every two parts of the first pre-assembly; the joint of every two of the first pre-assemblies comprises an installation gap between a thin-wall cooling flow channel 4 and an installation hole of a lower cover plate 2, an installation gap between the thin-wall cooling flow channel 4 and an installation hole of a middle-layer clapboard 8, and installation gaps between the lower cover plate 2 and a structural body 3 and a lower boss 10 respectively, wherein the installation gap distance between the structural body 3 and the lower cover plate 2 and the installation gap distance between the lower boss 10 and the lower cover plate 2 are the same as the installation gap distance between the installation holes on the middle-layer clapboard 8;
(2) after the first pre-assembly coated with the paste brazing filler metal is pressed and fixed by a fixing tool, carrying out first vacuum brazing under the conditions that the vacuum degree is 0.008-40Pa and the brazing temperature is 800-1100 ℃, removing the fixing tool after the brazing time is 50min to obtain a first assembly with a sealed lower cavity, and when the brazing temperature is reached, the paste brazing filler metal permeates the first pre-assembly through the capillary action so as to achieve the effect of welding and fixing; carrying out a tightness test on the first component; the tightness test comprises but is not limited to a water pressure test, and the test shows that the upper chamber can be kept for 10min without leakage when the water pressure is 4MPa, which shows that the upper chamber of the double-cavity structure manufactured by the invention has good sealing performance;
(3) placing an upper cover plate 1 into a structural body 3 of a first assembly, forming an upper cavity together with a middle layer partition plate 8 and the structural body 3, and assembling a second pre-assembly after the upper ends of a plurality of thin-wall cooling flow channels 4 sequentially penetrate through the middle layer partition plate 8 and the structural body 3; uniformly coating paste-shaped brazing filler metal on the outer surface of the joint of every two parts of the second pre-assembly; the joint of the second pre-assembly comprises the joint of the upper cover plate 1 and the thin-wall cooling flow channel 4 and the middle-layer clapboard 8 respectively; the joint of every two of the second pre-assemblies comprises an installation gap between the thin-wall cooling flow channel 4 and an installation hole of the upper cover plate 1, an installation gap between the thin-wall cooling flow channel 4 and an installation hole of the middle-layer partition plate 8, and installation gaps between the upper cover plate 1 and the structural body 3 and the upper boss 9 respectively, wherein the installation gap distance between the structural body 3 and the upper cover plate 1, and the installation gap distance between the upper boss 9 and the upper cover plate 1 are the same as the installation gap distance between the installation holes on the middle-layer partition plate 8; the paste brazing filler metal is uniformly coated on the outer surface of the mounting gap;
(4) and (3) after the second pre-assembly coated with the paste brazing filler metal is pressed and fixed by a fixing tool, carrying out second vacuum brazing under the conditions that the vacuum degree is 0.008-40Pa and the brazing temperature is 800-1080 ℃, removing the fixing tool after 50min of brazing, and completing the sealing of the upper chamber to obtain the double-cavity structure with the thin-wall cooling flow channel. Carrying out a tightness test on the second assembly; the tightness test comprises but not limited to a hydraulic test, and the test shows that the lower chamber can keep no leakage for 10min under the water pressure of 4MPa, which shows that the lower chamber with the double-cavity structure manufactured by the invention has good sealing performance.
Further, it is necessary to process the upper cover plate 1, the lower cover plate 2, the structural body 3, and the plurality of thin-walled cooling flow channels 4 before the step (1); the processing method of the upper cover plate 1, the lower cover plate 2 and the structural body 3 is the prior art, the thin-wall cooling flow passage 4 is processed by a cold processing method (turning and electric spark), the cold processing method is the prior art, and details are not repeated in this embodiment; the dual-cavity structure in this embodiment includes a cylindrical dual-cavity structure, and the diameter of the cylindrical dual-cavity structure is not less than 600 mm.
Further, referring to fig. 1, the dual-cavity structure includes a cylindrical upper cavity and a cylindrical lower cavity, and the diameters of the upper cavity and the lower cavity are not less than 600 mm; the structure 3 is preferably a cylindrical structure made of stainless steel; the upper cover plate 1 is a circular upper cover plate which is matched with the cylindrical structure and is made of high-temperature-resistant alloy materials; the lower cover plate 2 is a circular lower cover plate which is matched with the cylindrical structure and is made of stainless steel materials; the thin-wall cooling flow channel 4 is made of cylindrical stainless steel materials, the wall thickness of the thin-wall cooling pipe is 2.5mm, and the number of the thin-wall cooling flow channels is not less than 20.
Further, the high-temperature resistant alloy material is Cr-Zr-Cu; the stainless steel material is 06Cr19Ni10 stainless steel.
Further, referring to fig. 1, the structural body 3 is provided with an upper boss 9 for placing the upper cover plate 1 and a lower boss 10 for placing the lower cover plate 2 on two sides of the top and the bottom of the middle layer partition plate 8, respectively, and the upper boss 9, the lower boss 10 and the middle layer partition plate 8 are integrated with the structural body 3.
Further, referring to fig. 2 and 3, the thin-wall cooling flow passage 4 penetrates through the upper chamber and the lower chamber through mounting holes respectively formed in the upper cover plate 1, the middle partition plate 4 and the lower cover plate 2; the mounting hole is matched with the thin-wall cooling flow passage structure, and the single-side mounting gap between the mounting hole and the thin-wall cooling flow passage 4 is 0.02-0.06 mm.
Further, the paste brazing filler metal is prepared by blending a binder and a powdery brazing filler metal in a mass ratio of 1:4, wherein the powdery brazing filler metal comprises but is not limited to powdery HBNi82CrSiB brazing filler metal, the binder is a common binder for vacuum brazing, and the binder comprises but is not limited to polystyrene with 20% of mass fraction and xylene as a solvent. The coating of the paste brazing filler metal on the outer surface of the joint is ensured, the uniformity of the brazing filler metal coating on the joint is ensured, the quality of a welding seam is ensured, and the sealing performance of the upper cavity and the lower cavity is further ensured.
Further, referring to fig. 2 and 3, the upper end of the thin-wall cooling flow channel 4 is flush with the top of the upper cover plate 1, and the lower end extends out of the lower cover plate 2; the fixing tool comprises an upper fixing plate 5 and a lower fixing plate 6; when the first pre-assembly or the second pre-assembly is fixed between the upper fixing plate 5 and the lower fixing plate 6 through the fastening piece 7, two ends of the thin-wall cooling flow channel 4 and the top and the bottom of the middle layer partition plate 8 are respectively abutted against the upper fixing plate 5 and the lower fixing plate 6; the fastening members 7 are assembled at both sides of the upper fixing plate 5 and the lower fixing plate 6.
It should be noted that, referring to fig. 2 and fig. 3, the fastening member 7 of this embodiment includes a bolt and nuts that are sleeved on the bolt and are in threaded connection with two ends of the bolt, one of the nuts is placed in the upper fixing plate 5, and the other nut is located below the lower fixing plate 6, and the upper fixing plate and the lower fixing plate are drawn together by the two nuts and the bolt, so as to fix the first pre-assembly or the second pre-assembly between the upper fixing plate and the lower fixing plate. The first pre-assembly or the second pre-assembly is fixed through the fixing tool during vacuum brazing, so that the first pre-assembly or the second pre-assembly can be integrally heated and brazed during vacuum brazing, each point of the first pre-assembly or the second pre-assembly is heated at a constant temperature and is synchronously shrunk and deformed, the manufacturing method can control the deformation of the thin-wall cooling flow channel during the welding process, and the thin-wall cooling flow channel has the defects of difficult assembly and large-gap brazing in an upper chamber and a lower chamber.
It should be noted that, in the practical application, the recombination time according to the embodiment may be properly adjusted according to the influence of different vacuum furnaces, tool materials and thicknesses, and the adjustment range is ± 10 mm.
Example 2
This example was the same as example 1 except that the brazing parameters of the first vacuum brazing and the second vacuum brazing were different from those of example 1. In the embodiment, the vacuum degree of the first vacuum brazing is 3-40Pa, the brazing temperature is 820-1100 ℃, and the brazing time is 50 min; the vacuum degree of the second vacuum brazing is 3-40Pa, the brazing temperature is 800-1060 ℃, and the brazing time is 50 min. A hydraulic pressure test shows that the upper chamber and the lower chamber of the double-cavity structure with the thin-wall cooling flow channel, which are manufactured by the manufacturing method, are kept under the condition that the water pressure is 4MPa for 10min without leakage, and the upper chamber and the lower chamber of the double-cavity structure manufactured by the manufacturing method have good sealing performance.
Example 3
This example was the same as example 1 except that the brazing parameters of the first vacuum brazing and the second vacuum brazing were different from those of example 1. In the embodiment, the vacuum degree of the first vacuum brazing is 3-40Pa, the brazing temperature is 820-1068 ℃, and the brazing time is 60 min; the vacuum degree of the second vacuum brazing is 3-40Pa, the brazing temperature is 800-1048 ℃, and the brazing time is 60 min. A hydraulic pressure test shows that the upper chamber and the lower chamber of the double-cavity structure with the thin-wall cooling flow channel, which are manufactured by the manufacturing method, are kept under the condition that the water pressure is 4MPa for 10min without leakage, and the upper chamber and the lower chamber of the double-cavity structure manufactured by the manufacturing method have good sealing performance.
Example 4
This example was the same as example 1 except that the brazing parameters of the first vacuum brazing and the second vacuum brazing were different from those of example 1. In the embodiment, the vacuum degree of the first vacuum brazing is 5-40Pa, the brazing temperature is 820-1100 ℃, and the brazing time is 40 min; the vacuum degree of the second vacuum brazing is 5-40Pa, the brazing temperature is 800-1080 ℃, and the brazing time is 40 min. A hydraulic pressure test shows that the upper chamber and the lower chamber of the double-cavity structure with the thin-wall cooling flow channel, which are manufactured by the manufacturing method, are kept under the condition that the water pressure is 4MPa for 10min without leakage, and the upper chamber and the lower chamber of the double-cavity structure manufactured by the manufacturing method have good sealing performance.
Example 5
This example was the same as example 1 except that the brazing parameters of the first vacuum brazing and the second vacuum brazing were different from those of example 1. In the embodiment, the vacuum degree of the first vacuum brazing is 5-40Pa, the brazing temperature is 800-1068 ℃, and the brazing time is 60 min; the vacuum degree of the second vacuum brazing is 5-40Pa, the brazing temperature is 800-1048 ℃, and the brazing time is 60 min. A hydraulic pressure test shows that the upper chamber and the lower chamber of the double-cavity structure with the thin-wall cooling flow channel, which are manufactured by the manufacturing method, are kept under the condition that the water pressure is 4MPa for 10min without leakage, and the upper chamber and the lower chamber of the double-cavity structure manufactured by the manufacturing method have good sealing performance.
Example 6
This example was the same as example 1 except that the brazing parameters of the first vacuum brazing and the second vacuum brazing were different from those of example 1. In the embodiment, the vacuum degree of the first vacuum brazing is 0.008-35Pa, the brazing temperature is 820-1100 ℃, and the brazing time is 50 min; the vacuum degree of the second vacuum brazing is 0.008-35Pa, the brazing temperature is 800-1080 ℃, and the brazing time is 50 min. A hydraulic pressure test shows that the upper chamber and the lower chamber of the double-cavity structure with the thin-wall cooling flow channel, which are manufactured by the manufacturing method, are kept under the condition that the water pressure is 4MPa for 10min without leakage, and the upper chamber and the lower chamber of the double-cavity structure manufactured by the manufacturing method have good sealing performance.
Example 7
This example was the same as example 1 except that the brazing parameters of the first vacuum brazing and the second vacuum brazing were different from those of example 1. In the embodiment, the vacuum degree of the first vacuum brazing is 0.008-35Pa, the brazing temperature is 800-1068 ℃, and the brazing time is 60 min; the vacuum degree of the second vacuum brazing is 0.008-35Pa, the brazing temperature is 800-1048 ℃, and the brazing time is 60 min. A hydraulic pressure test shows that the upper chamber and the lower chamber of the double-cavity structure with the thin-wall cooling flow channel, which are manufactured by the manufacturing method, are kept under the condition that the water pressure is 4MPa for 10min without leakage, and the upper chamber and the lower chamber of the double-cavity structure manufactured by the manufacturing method have good sealing performance.
The foregoing is a preferred embodiment of the present invention, and it should be noted that it would be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are also considered to be within the scope of the invention.
Claims (8)
1. A manufacturing method of a double-cavity structure with a thin-wall cooling flow passage is characterized by comprising the following steps: the manufacturing method comprises the following steps:
(1) placing a lower cover plate (2) into a structural body (3) provided with a middle-layer partition plate (8), forming a lower cavity together with the structural body (3) and the middle-layer partition plate (8), and sequentially penetrating the lower ends of a plurality of thin-wall cooling flow channels (4) with the wall thickness of less than or equal to 2.5mm through the middle-layer partition plate (8) and the lower cover plate (2) to assemble a first pre-assembly; uniformly coating and injecting paste-shaped brazing filler metal on the surface of the joint of every two parts of the first pre-assembly;
(2) after the first pre-assembly coated with the paste brazing filler metal is pressed and fixed by a fixing tool, carrying out first vacuum brazing under the conditions that the vacuum degree is 0.008-40Pa and the brazing temperature is 800-1100 ℃, and removing the fixing tool after brazing for 40-60min to obtain a first assembly with a sealed lower chamber;
(3) placing an upper cover plate (1) into a structural body (3) of a first assembly, forming an upper cavity together with the structural body (3) and a middle-layer partition plate (8), and assembling a second pre-assembly after the upper end of a thin-wall cooling flow channel (4) penetrates through the middle-layer partition plate (8) and the structural body (3) in sequence; uniformly coating and injecting paste-shaped brazing filler metal on the surfaces of the pairwise joints of the parts of the second pre-assembly;
an upper boss (9) for placing an upper cover plate (1) and a lower boss (10) for placing a lower cover plate (2) are respectively arranged on two sides of a middle layer partition plate (8) of the structure body (3), and the upper boss (9), the lower boss (10) and the middle layer partition plate (8) are integrated with the structure body (3);
the thin-wall cooling runner (4) penetrates through the upper cavity and the lower cavity through mounting holes respectively formed in the upper cover plate (1), the middle-layer partition plate (8) and the lower cover plate (2); the mounting hole is matched with the thin-wall cooling flow passage (4) in structure, and the unilateral mounting gap between the mounting hole and the thin-wall cooling flow passage (4) is 0.02-0.06 mm;
(4) after the second pre-assembly coated with the paste brazing filler metal is pressed and fixed by a fixing tool, second vacuum brazing is carried out under the conditions that the vacuum degree is 0.008-40Pa and the brazing temperature is 800-1080 ℃, the fixing tool is removed after brazing is carried out for 40-60min, the upper chamber is sealed, and the double-cavity structure with the thin-wall cooling flow channel is obtained.
2. The method of claim 1 for making a dual cavity structure with thin wall cooling channels, wherein: the double-cavity structure comprises a cylindrical upper cavity and a cylindrical lower cavity, and the diameters of the upper cavity and the lower cavity are not less than 600 mm.
3. The method of manufacturing a dual cavity structure with thin wall cooling channels as claimed in claim 1 or 2, wherein: the structural body (3) is of a cylindrical structure, and the upper cover plate (1) is a circular upper cover plate matched with the cylindrical structure; the lower cover plate (2) is a circular lower cover plate matched with the cylindrical structure; the thin-wall cooling flow channel (4) adopts cylindrical thin-wall cooling pipelines, and the number of the thin-wall cooling flow channels is not less than 20.
4. The method of claim 3 for making a dual cavity structure with thin wall cooling channels, wherein: the structure body (3), the lower cover plate (2) and the thin-wall cooling flow channel (4) are all made of stainless steel materials; the upper cover plate (1) is made of high-temperature-resistant alloy materials.
5. The method of claim 1 for making a dual cavity structure with thin wall cooling channels, wherein: the joint of each two of the first pre-assemblies comprises an installation gap of a thin-wall cooling flow channel (4) and an installation hole of the lower cover plate (2), an installation gap of the thin-wall cooling flow channel (4) and an installation hole of the middle-layer partition plate (8), and a gap between the lower cover plate (2) and the structural body (3);
the joint of each two of the second pre-assemblies comprises an installation gap between the thin-wall cooling flow channel (4) and an installation hole in the upper cover plate (1), an installation gap between the thin-wall cooling flow channel (4) and an installation hole in the middle layer partition plate (8), and an installation gap between the upper cover plate (1) and the structural body (3).
6. The method of claim 1 for making a dual cavity structure with thin wall cooling channels, wherein: the paste brazing filler metal is prepared by blending a binder and a powdery brazing filler metal in a mass ratio of 1: 4.
7. The method of claim 1 for making a dual cavity structure with thin wall cooling channels, wherein: the upper end of the thin-wall cooling flow channel (4) is flush with the top of the upper cover plate (1), and the lower end of the thin-wall cooling flow channel extends out of the lower cover plate (2);
the fixing tool comprises an upper fixing plate (5) and a lower fixing plate (6); when the first pre-assembly or the second pre-assembly is fixed between the upper fixing plate (5) and the lower fixing plate (6) through the fasteners (7) on the two sides of the fixing tool, the two ends of the thin-wall cooling flow channel (4) and the top and the bottom of the structural body (3) are respectively abutted to the upper fixing plate (5) and the lower fixing plate (6).
8. The method of claim 1 for making a dual cavity structure with thin wall cooling channels, wherein: performing tightness inspection on the first assembly and the second assembly before the step (3) and after the second vacuum brazing respectively; the tightness test comprises a hydrostatic test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910175049.3A CN109877410B (en) | 2019-03-08 | 2019-03-08 | Manufacturing method of double-cavity structure with thin-wall cooling flow channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910175049.3A CN109877410B (en) | 2019-03-08 | 2019-03-08 | Manufacturing method of double-cavity structure with thin-wall cooling flow channel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109877410A CN109877410A (en) | 2019-06-14 |
| CN109877410B true CN109877410B (en) | 2021-08-06 |
Family
ID=66931309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910175049.3A Active CN109877410B (en) | 2019-03-08 | 2019-03-08 | Manufacturing method of double-cavity structure with thin-wall cooling flow channel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109877410B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112338453B (en) * | 2020-10-23 | 2021-09-28 | 西安远航真空钎焊技术有限公司 | Machining method of thin-wall complex cavity |
| CN113664399B (en) * | 2021-08-16 | 2023-10-24 | 西安远航真空钎焊技术有限公司 | Processing method of K-shaped baffle cavity |
| CN113654083B (en) * | 2021-08-25 | 2022-06-07 | 西安远航真空钎焊技术有限公司 | Anti-cavity-crossing structure between parallel runners |
| CN113751966B (en) * | 2021-08-25 | 2022-07-26 | 西安远航真空钎焊技术有限公司 | Thin-wall part runner forming method based on vacuum brazing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2389175A (en) * | 1942-10-07 | 1945-11-20 | Clifford Mfg Co | Method of making heat exchange apparatus |
| JPS60137566A (en) * | 1983-12-27 | 1985-07-22 | Showa Alum Corp | Production of heat exchanging tube provided with aluminum fin |
| CN102649187A (en) * | 2012-05-22 | 2012-08-29 | 哈尔滨汽轮机厂有限责任公司 | Vacuum brazing method of gas burner of combustion chamber of gas turbine |
| CN103962669A (en) * | 2013-01-31 | 2014-08-06 | 通用电气公司 | Brazing process and plate assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6871774B2 (en) * | 2002-01-04 | 2005-03-29 | Triumph Brands, Inc. | Aluminum tubular heat exchanger and method of construction |
-
2019
- 2019-03-08 CN CN201910175049.3A patent/CN109877410B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2389175A (en) * | 1942-10-07 | 1945-11-20 | Clifford Mfg Co | Method of making heat exchange apparatus |
| JPS60137566A (en) * | 1983-12-27 | 1985-07-22 | Showa Alum Corp | Production of heat exchanging tube provided with aluminum fin |
| CN102649187A (en) * | 2012-05-22 | 2012-08-29 | 哈尔滨汽轮机厂有限责任公司 | Vacuum brazing method of gas burner of combustion chamber of gas turbine |
| CN103962669A (en) * | 2013-01-31 | 2014-08-06 | 通用电气公司 | Brazing process and plate assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109877410A (en) | 2019-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109877410B (en) | Manufacturing method of double-cavity structure with thin-wall cooling flow channel | |
| US3072225A (en) | Honeycomb sandwich structure | |
| EP1422018A1 (en) | Rocket engine combustion chamber having multiple conformal throat supports | |
| US4046305A (en) | Metallic bonding method | |
| US5701670A (en) | Method of making rocket engine combustion chamber utilizing "slide in" port liner | |
| CN107825046B (en) | Welding tool and welding method for thin-wall corrugated pipe sheet | |
| US4856163A (en) | Combustor of high pressure burner for rocket engine and method of fabrication thereof | |
| US4623087A (en) | Application of coatings to articles | |
| CN109834396A (en) | Composite tooling and thrust chamber welding procedure for thrust chamber welding | |
| US4304350A (en) | Method of pressurization system for superplastic forming and diffusion bonding | |
| CN111069759A (en) | Diffusion connection tool and diffusion connection method special for copper steel | |
| US4326117A (en) | Weld braze technique | |
| JP2017535696A (en) | Method for producing insulating window glass | |
| JPH1054688A (en) | Manufacture of wall body for cooling | |
| US9427817B2 (en) | Brazing method | |
| CN109735863B (en) | Electrolytic cell for water electrolysis hydrogen production and design method | |
| CN110508957B (en) | Brazing and instantaneous liquid state diffusion welding step-by-step composite connection method for double-layer plate structure | |
| CN106271034B (en) | The positive and negative Compound Extrusion of covering the first wall isothermal and vacuum diffusion welding composite manufacturing method | |
| US20070259192A1 (en) | Method for producing components for rocket construction | |
| TWI485023B (en) | Aluminum alloy oil hot plate manufacturing method | |
| RU178435U1 (en) | A device for assembling cylindrical parts from aluminum alloys for soldering | |
| CN219004098U (en) | Titanium steel composite sheet assembly | |
| CN111408904B (en) | Method for preparing sandwich plate with high efficiency and high quality by electric arc and sandwich plate | |
| JPH04315524A (en) | Member for bonding together copper material and aluminum material and manufacture thereof | |
| JP3719945B2 (en) | Hot static pressure bonding method and first wall structure manufacturing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20191220 Address after: Room A112, floor 1, block a, building 15, Jingwei new City Innovation Industrial Park, Xi'an Economic and Technological Development Zone, Xi'an City, Shaanxi Province 710200 Applicant after: Xi'an Yuanhang Vacuum Brazing Technology Co., Ltd. Address before: 710200 Room A112, First Floor, Area A, Building 15, Innovation Industrial Park, Jingwei New Town, Xi'an Economic and Technological Development Zone, Shaanxi Province Applicant before: Ren Yaowen |
|
| TA01 | Transfer of patent application right | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |