A method for processing pressure measuring holes of brazed parts with invisible interlayer cooling structure

Abstract

The present invention proposes a method for processing pressure measuring holes of brazed parts with invisible interlayer cooling structures, including: processing inner wall cooling grooves and pressure measuring bosses, aligning the boss center and marking lines; introducing the inner wall boss marking lines into the inner surface of the inner wall; electroplating the inner wall and outer wall, assembling and brazing; introducing the marking lines on the inner surface of the brazed part into the outer wall; pre-drilling a small hole; expanding the hole after fluoroscopic inspection; re-perspective after expanding the hole, and processing the nozzle hole after meeting the requirements. The present invention proposes an empirical formula and a processing judgment method for iterative adjustment of the hole position offset and processing size considering the influence of X-ray detection error, positioning tool error and thermal deformation of the brazed part, which realizes the precise processing of the nozzle hole with an offset of no more than 0.5 mm, and solves the problem of processing the invisible state of the nozzle hole of the interlayer cooling structure brazed part. Two sets of marking and positioning tooling are set to realize the transformation between the inner surface and the outer surface of the marking position of the cylindrical structural part, which can realize the rapid determination of the initial position and improve the detection efficiency.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing, and in particular to a method for processing a pressure measuring hole of a brazing part with an invisible interlayer cooling structure. Background Art

[0002] The high temperature of liquid rocket engine gas is as high as 3000-4000K, and the heat flux density can reach 160W / m 2 , far exceeding the temperature limit that current materials can withstand. In order to adapt to the high-temperature oxygen-rich gas high-speed flushing operating conditions, the combustion assembly of the liquid oxygen-kerosene high-pressure regenerative engine adopts a milled slot sandwich cooling structure design. The inner wall is a copper alloy with excellent heat dissipation performance, and the outer wall is high-strength stainless steel. The inner and outer walls are connected by vacuum diffusion brazing. When the engine is working, one side of the inner wall is high-temperature gas, and the other side is filled with low-temperature liquid oxygen propellant. Liquid oxygen is used to reduce the temperature of the inner wall of the rocket engine to keep it below the melting point to ensure the service performance of the material.

[0003] With the increase of engine thrust, higher requirements are put forward for the effective volume of the gas generator and the reliable operation of the inner wall of the body. The body structure design of a large thrust engine gas generator adopts a sandwich cooling structure. For the first time, a pulsating pressure and temperature probe is added to the body to measure the pulsating pressure and temperature of the oxygen-rich gas of the gas generator, evaluate the working reliability of the gas generator, and provide data support for the autonomous shutdown of the engine during the start-up phase. However, the installation and processing of the pulsating pressure and temperature probe on the body structure has the following difficulties:

[0004] 1. In order not to reduce the cooling effect of the cooling circuit, the size of the nozzle platform for the sandwich cooling structure brazing part is only 1mm larger than the nozzle;

[0005] 2. After the inner and outer walls of the sandwich cooling structure brazing parts are brazed, the inner wall boss is invisible and the processing position of the nozzle cannot be determined;

[0006] 3. If the nozzle hole is skewed during machining, it will directly lead to leakage in the sandwich cooling brazing structure, causing the product to be scrapped. Therefore, how to accurately machine the nozzle hole is very critical. Summary of the invention

[0007] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art, to provide a positioning and marking tool and a processing method for the pressure measuring hole of a sandwich cooling structure brazing part in an invisible state, to achieve precise processing of the measuring nozzle hole with an offset of no more than 0.5 mm, and to solve the problem of positioning and processing the measuring nozzle hole of the sandwich cooling structure brazing part in an invisible state.

[0008] The technical solution of the present invention is:

[0009] A method for processing a pressure measuring hole of an invisible interlayer cooling brazing part, comprising:

[0010] S1: Process cooling grooves and pressure measuring bosses on the outer surface of the inner wall, find the center of the pressure measuring boss and mark it;

[0011] S2: Use the first marking and positioning tool to lead the center mark line of the pressure measuring boss in S1 to the inner surface of the inner wall;

[0012] S3: electroplating the outer surface of the inner wall and the inner surface of the outer wall; after the inner wall and the outer wall are assembled, they are connected by diffusion brazing to obtain a brazed assembly;

[0013] S4: Using a second marking and positioning tool to draw the center line of the pressure measuring boss on the inner surface of the inner wall of the brazing assembly obtained in S3 to the outer surface of the outer wall of the brazing assembly;

[0014] S5: using the center line of the pressure measuring boss on the outer surface of the outer wall of the brazing assembly determined in S4 as the center point to process a hole with a diameter of R1;

[0015] S6: Taking the hole processed in step 5 as the center, perform perspective, draw lines on the X-ray film to determine the center (0, 0) of the pressure measuring boss and the center (X1, Y1) of the small hole, and measure the radius R2 of the pressure measuring boss;

[0016] S7: Taking the center of the pressure measuring boss determined in S6 as a reference, the hole obtained in S5 is enlarged by a radius R3;

[0017] S8: Taking the hole processed in S7 as the center, perform perspective, determine the hole center (X2, Y2), and measure the radius R4 of the pressure measuring boss;

[0018] S9: Determine the change value (ΔX, ΔY) based on the hole center of S8 and S6. If the change value (ΔX, ΔY) is less than the allowable value (ΔX 允许 , ΔY 允许 ), then directly determine the hole center and the nozzle hole R according to S8 测嘴 Processing nozzle hole;

[0019] S10: If the change value (ΔX, ΔY) is greater than the allowable value (ΔX 允许 , ΔY 允许 ), the hole of S7 is further enlarged based on the center of the pressure measuring boss, and the adjustment is repeated according to the process of S8 to S9 until the change value (ΔX i , ΔY i ) is less than the allowable value (ΔX 允许 , ΔY 允许 ), the X-ray probe is used to perform perspective with the i-th hole as the center, and the coordinate value of the hole center is (X i ,Y i ), according to the hole center and the nozzle hole radius R determined for the i-th time 测嘴 Process the nozzle hole.

[0020] The first marking and positioning tool includes a first positioning block, a first marking plate, a first fastening screw and a second fastening screw. The first positioning block includes a fixedly connected outer positioning ring and a first block. The outer positioning ring includes a first ring body and a second ring body that are integrally connected. The second ring body is used to be inserted into the inner side of the inner wall. The first ring body is connected to one end of the second ring body and abuts against the top of the inner wall. The first block is located on the side of the first ring body away from the second ring body. The first fastening screw is threadedly connected to the second ring body, and the end of the first fastening screw abuts against the inner surface of the inner wall. A groove is provided on the first block, and the first marking plate is placed in the groove. The second fastening screw is threadedly connected to the first block, and one end extends into the groove. The two ends of the first marking plate are respectively located on the inner and outer sides of the inner wall.

[0021] The step 2 includes inserting the first positioning block into the inner side of the inner wall, rotating the first positioning block, bringing one end of the first scoring plate into close contact with the boss on the outer surface of the inner wall, rotating the first fastening screw to tighten the outer positioning ring of the first positioning block to the inner wall, moving the position of the first scoring plate, bringing the other end of the first scoring plate into close contact with the inner surface of the inner wall, rotating the second fastening screw to tighten the first scoring plate to the first positioning block, outlining the outer contour of the contact area, determining the center of the outer contour, and using the center as the center scale line of the pressure measuring boss on the inner surface of the inner wall.

[0022] The second marking and positioning tool includes a second positioning block, a second marking plate, a third fastening screw and a fourth fastening screw. The second positioning block includes an inner positioning ring and a second block. The inner positioning ring includes a third ring body and a fourth ring body that are integrally connected. The fourth ring body is located on the outside of the outer surface of the outer wall. The third ring body is connected to the end of the fourth ring body and abuts against the end of the outer wall. The second block is located on the side of the third ring body away from the fourth ring body. The third fastening screw is threadedly connected to the fourth ring body, and the end of the third fastening screw abuts against the outer surface of the outer wall. A groove is provided on the second block, and the second marking plate is placed in the groove. The fourth fastening screw is threadedly connected to the second block, and one end extends into the groove. The two ends of the second marking plate are respectively located on the inner side of the inner wall and the outer side of the outer wall.

[0023] The step 4 includes installing the second positioning block into the outer wall of the brazing component with the outer wall end face as a positioning reference, adjusting the circumferential position of the second positioning block, tightly connecting one end of the second scoring plate with the score line of step 2 on the inner surface of the inner wall of the brazing component, tightening the second positioning block and the brazing component by a third fastening screw, moving the position of the second scoring plate, tightly contacting the other end of the second scoring plate with the outer surface of the outer wall of the brazing component, tightening the second scoring plate and the second positioning block by a fourth fastening screw, outlining the outer contour of the contact area, determining the center of the outer contour, and using the center as the center score line of the pressure measuring boss on the outer surface of the outer wall of the brazing assembly.

[0024] R1≤1 / 5R凸台 , R 凸台 is the radius of the pressure measuring boss.

[0025] The size of the hole after expansion in step 7 R 测嘴 is the radius of the measuring nozzle.

[0026] In step 9,

[0027] ΔX=X2-X1, ΔY=Y2-Y1, ΔX 允许 =(R 凸台 -R 测嘴 )×R,ΔY 允许 =(R 凸台 -R 测嘴 )×R,

[0028] R is the X-ray detection system error,

[0029] Size after expansion

[0030] In step 10, ΔX i =X i -X i-1 , ΔY=Y i -Y i-1 , (X i ,Y i ) is the center of the hole after the i-th expansion, (X i-1 ,Y i-1 ) is the center of the hole after the i-1th expansion.

[0031] In summary, this application at least includes the following beneficial technical effects:

[0032] (1) The present invention proposes a precision machining method for invisible holes based on X-ray detection. Based on the advantages of X-ray detection for non-destructive inspection, the problem of nozzle positioning in an invisible state is solved. An empirical formula and a machining judgment method for iterative adjustment of hole position offset and machining size are given that take into account the influence of X-ray detection error, positioning tooling error and thermal deformation of brazed parts, thereby achieving precise machining of nozzle holes with an offset of no more than 0.5 mm and solving the problem of machining nozzle holes in an invisible state for brazed parts with sandwich cooling structures.

[0033] (2) In order to meet the positioning requirements of parts and brazed parts, the present invention proposes two sets of positioning and marking tools, which realize the transformation between the inner surface and the outer surface of the marking position of the cylindrical structural parts through the U-shaped marking plate. At the same time, combined with the characteristics of cylindrical thin-walled parts and brazed parts, the reference positioning position and the positioning form and fastening method are reasonably selected to ensure the reliability of the positioning and marking functions. Compared with the traditional end face positioning and marking method, this method avoids the influence of brazing thermal deformation on the marking method. Secondly, compared with X-ray detection positioning, the positioning and marking tool can realize the rapid determination of the initial position, thereby improving the detection efficiency.

[0034] This method is not limited by product structure and is applicable to the strict requirements for the processing of nozzle holes of brazed parts of liquid oxygen-kerosene rocket engine sandwich cooling structures. It is also applicable to processing in aviation, nuclear power, weapons and civil fields where the positioning benchmark is not visible. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural diagram of an embodiment of the present invention.

[0036] Figure 2 Positioning tooling for the first scribing.

[0037] Figure 3 Position the tooling for the second scribing line.

[0038] Description of reference numerals: 1, outer wall; 2, inner wall;

[0039] 21. Pressure measuring boss; 22. Measuring nozzle hole;

[0040] 11. first positioning block; 12. first scoring plate; 121. outer end; 122. inner end; 13. first fastening screw; 14. second fastening screw; 111. first handle; 112. outer positioning ring; 113. first block;

[0041] 21. Second positioning block; 22. Second scoring plate; 221. Inner end; 222. Outer end; 23. Third fastening screw; 24. Fourth fastening screw; 211. Second handle; 212. Inner positioning ring; 213. Second block. DETAILED DESCRIPTION

[0042] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0043] The following is a more detailed description of the specific implementation of the present invention in conjunction with specific examples, so that the scheme of the present invention and its advantages can be better understood. However, the specific implementation and examples described below are only for the purpose of illustration, rather than limitation of the present invention.

[0044] The embodiment of the present invention is a gas generator cone section of a large thrust liquid rocket engine, such as Figure 1 As shown, it is mainly formed by diffusion brazing of the outer wall 1 and the inner wall 2, the inner wall material is QCr0.8 copper alloy, and the outer wall material is S-03 high-strength stainless steel. The pressure measuring boss 21 on the inner wall surface has a diameter of 20 mm, and the measuring nozzle hole 22 has a diameter of 18 mm.

[0045] The implementation steps are as follows:

[0046] (1) The cooling groove on the outer surface of the inner wall 2 is milled, and the pressure measuring boss 21 of the inner wall 2 is processed by a machining center. During processing, the center of the pressure measuring boss 21 is aligned and engraved by the machine tool.

[0047] (2) Use the first marking and positioning tool 1 to lead the marking line of the inner wall boss center 21 in step 1 to the inner surface of the inner wall 2.

[0048] (3) Electroplating the outer surface of the inner wall 2 and the inner surface of the outer wall 1 in step 1. After the inner wall and the outer wall are assembled, they are connected by diffusion brazing to obtain a brazed assembly. Specifically, the outer surface of the inner wall is silver-plated and the inner surface of the outer wall is copper-plated. The assembly gap is required to be no greater than 50 μm, and the brazing method is gas-shielded diffusion brazing.

[0049] (4) For the brazing assembly obtained in step 3, a second marking and positioning tool 2 is used to lead the marking line on the inner surface of the inner wall determined in step 2 to the outer surface of the outer wall of the brazing assembly.

[0050] (5) Use the position determined in step 4 as the center point to process a hole with a diameter of R1. The diameter of the small hole R1 ≤ 1 / 5R 凸台 , where R 凸台 is the radius of the pressure measuring boss.

[0051] (6) The X-ray probe is used to perform radioscopy with the small hole processed in step 5 as the center. On the X-ray film, lines are drawn to determine the center of the pressure measuring boss (0, 0) and the center of the small hole (X1, Y1), and the radius R2 of the boss is measured.

[0052] (7) Based on the center of the pressure measuring boss determined in step 6, the hole obtained in step 5 is enlarged by a radius of R3. The size of the expanded hole is

[0053] (8) The X-ray probe is used to perform perspective viewing with the hole processed in step 7 as the center, the hole center (X2, Y2) is determined, and the radius R4 of the boss is measured.

[0054] (9) Calculate the change value (ΔX, ΔY) of the hole center in step 8 and step 6. If the change value (ΔX, ΔY) is less than the allowable value (ΔX 允许 , ΔY 允许 ), then directly follow step 8 to determine the center of the hole and the nozzle hole R 测嘴 Processing nozzle hole; ΔX = X2-X1, ΔY = Y2-Y1, ΔX允许 =(R 凸台 -R 测嘴 )×R,ΔY 允许 =(R 凸台 -R 测嘴 )×R, where R is the X-ray detection system error, Size after expansion

[0055] (10) If the change value (ΔX, ΔY) in step 9 is greater than the allowable value (ΔX 允许 , ΔY 允许 ), continue to expand the hole in step 7. Repeat the adjustment according to the process from step 8 to step 9 until the change value (ΔX i , ΔY i ) is less than the allowable value (ΔX 允许 , ΔY 允许 ), the X-ray probe is used to perform perspective with the i-th hole as the center, and the coordinate value of the hole center is (X i ,Y i ). Determine the hole center and the nozzle hole radius R for the i-th time 测嘴 Process the nozzle hole. ΔX i =X i -X i-1 , ΔY=Y i -Y i-1 ,

[0056] like Figure 2 As shown, the first marking and positioning tool 1 includes a first positioning block 11, a first marking plate 12, a first fastening screw 13 and a second fastening screw 14. The first positioning block 11 is welded by a first handle 111, an outer positioning ring 112 and a first block 113. The outer positioning ring 112 includes a first ring body and a second ring body connected in one piece. The second ring body is used to be inserted into the inner side of the inner wall. The first ring body is connected to one end of the second ring body and abuts against the top of the inner wall. The first block 113 is located on the side of the first ring body away from the second ring body. The first fastening screw is threadedly connected to the second ring body, and the end of the first fastening screw abuts against the inner surface of the inner wall. A groove is provided on the first block, and the first marking plate is placed in the groove. The second fastening screw is threadedly connected to the first block, and one end extends into the groove. The two ends of the first marking plate are respectively located on the inner side and the outer side of the inner wall. The outer positioning ring 112 is processed with a threaded hole for matching with the first fastening screw 13, and the first block 113 is processed with a threaded hole for matching with the second fastening screw 14.

[0057] like Figure 3As shown, the positioning block 11 is installed into the inner wall by the handle 111 with the inner wall end face as the positioning reference. The distance between the inner wall end face and the positioning block 11 measured by a feeler gauge should be no more than 3μm. The marking plate 12 is placed on the groove of the block 113 of the positioning block 11, and the circumferential position of the positioning block I is adjusted. The end of the marking plate 12 located outside the inner wall 2 is the outer end 121, and the end located inside the inner wall 1 is the inner end 122. The outer end 121 is aligned with the pressure measuring boss on the outer surface of the inner wall, and the outer positioning ring 112 of the positioning block 11 is tightened with the inner wall by the fastening screw 13. Move the position of the marking plate 12, and make the inner end 122 closely contact with the inner surface of the inner wall. The marking plate 12 is tightened with the block 113 of the positioning block I1 by the fastening screw 4. The outer contour of the contact area is depicted by an electric engraving table, and the center of the outer contour is determined, and the center is used as the center engraved line of the pressure measuring boss on the inner surface of the inner wall.

[0058] The second marking and positioning tool 2 includes a second positioning block 21, a second marking plate 22, a third fastening screw 23, and a fourth fastening screw 24. The positioning block 21 includes an integrally connected second handle 211, an inner positioning ring 212, and a second block 213. The inner positioning ring 212 includes an integrally connected third ring body and a fourth ring body. The fourth ring body is located outside the outer surface of the outer wall. The third ring body is connected to the end of the fourth ring body and abuts against the end of the outer wall. The second block 213 is located on the side of the third ring body away from the fourth ring body. The third fastening screw 23 is threadedly connected to the fourth ring body, and the end of the third fastening screw 23 abuts against the outer surface of the outer wall. A groove is provided on the second block. The second marking plate 22 is placed in the groove. The fourth fastening screw 24 is threadedly connected to the second block 213, and one end extends into the groove. The two ends of the second marking plate 22 are respectively located inside the inner wall and outside the outer wall.

[0059] The second positioning block 21 is installed into the outer wall of the brazing component by the handle 211, with the outer wall end face as the positioning reference, and the fourth ring body is located outside the outer surface of the outer wall. The circumferential position of the positioning block 21 is adjusted. The end of the second scoring plate 22 located inside the brazing component is the inner end 221, and the end located outside the brazing component is the outer end 222. The inner end 221 is aligned with the center scale line of the inner surface of the inner wall of the brazing component, and the third fastening screw 23 is tightened to fix the inner positioning ring 212 to the brazing component. The position of the second scoring plate 22 is moved, and the outer end 222 is contacted with the outer surface of the outer wall of the brazing component. The fourth fastening screw 24 is tightened to fix the scoring plate 22 to the second block 213. The outer contour of the contact area is depicted by an electric engraving table, and the center of the outer contour is determined, and the center is used as the center scale line of the pressure measuring boss on the outer surface of the outer wall of the brazing component.

[0060] The implementation principle of this application is:

[0061] First, the center line of the pressure measuring boss on the outer surface of the inner wall is roughly drawn to the inner surface of the inner wall through the first marking and positioning tool 1, and then the inner wall and the outer wall are fixed to obtain a brazing assembly, and then the center line of the pressure measuring boss on the inner surface of the inner wall is roughly drawn out to the outer surface of the outer wall of the brazing assembly through the second marking and positioning tool 2. In this step, during the process of fixing the inner wall and the outer wall, there may be deformation of the inner wall and the outer wall, and the center line of the pressure measuring boss is drawn to the outer surface of the outer wall through the first marking and positioning tool 1 and the second marking and positioning tool 2 to obtain an approximate center line of the pressure measuring boss.

[0062] After that, a hole with a smaller diameter is preliminarily processed with the center line of the pressure measuring boss as the center, and then the center of the pressure measuring boss is determined by perspective. Then, the hole is expanded based on the center of the pressure measuring platform until the difference between the center of the hole after expansion and the center of the hole before expansion is less than the set allowable value. According to the center of the hole determined at this time and the nozzle hole R 测嘴 Processing of nozzle holes. The precision processing of nozzle holes with an offset of no more than 0.5 mm was achieved, solving the problem of invisible processing of nozzle holes in sandwich cooling structure brazing parts.

[0063] Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A method for processing a pressure measuring hole of an invisible interlayer cooling brazing part, characterized in that: include S1: Processing a cooling groove and a pressure measuring boss (21) on the outer surface of the inner wall (2), aligning the center of the pressure measuring boss (21) and marking a line; S2: using a first marking and positioning tool to lead the center mark line of the pressure measuring boss (21) in S1 to the inner surface of the inner wall (2); S3: electroplating the outer surface of the inner wall (2) and the inner surface of the outer wall (1); after assembling the inner wall (2) and the outer wall (1), they are connected by diffusion brazing to obtain a brazed assembly; S4: using a second marking and positioning tool to draw the center line of the pressure measuring boss (21) on the inner surface of the inner wall (2) of the brazing assembly obtained in S3 to the outer surface of the outer wall (1) of the brazing assembly; S5: using the center line of the pressure measuring boss (21) on the outer surface of the outer wall (1) of the brazing assembly determined in S4 as the center point to process a hole with a diameter of R1; S6: Taking the hole processed in step 5 as the center, perform perspective viewing, draw lines on the X-ray film to determine the center (0, 0) of the pressure measuring boss (21) and the center (X1, Y1) of the small hole, and measure the radius R2 of the pressure measuring boss (21); S7: Taking the center of the pressure measuring boss (21) determined in S6 as a reference, the hole obtained in S5 is enlarged by a radius R3; S8: Taking the hole processed in S7 as the center, perform perspective viewing to determine the hole center (X2, Y2) and measure the radius R4 of the pressure measuring boss (21); S9: Determine the change value (ΔX, ΔY) based on the hole center of S8 and S6. If the change value (ΔX, ΔY) is less than the allowable value (ΔX 允许 , ΔY 允许 ), then directly determine the hole center and the nozzle hole R according to S8 测嘴 Processing nozzle hole; S10: If the change value (ΔX, ΔY) is greater than the allowable value (ΔX 允许 , ΔY 允许 ), the hole of S7 is further enlarged based on the center of the pressure measuring boss, and the adjustment is repeated according to the process of S8 to S9 until the change value (ΔX i , ΔY i ) is less than the allowable value (ΔX 允许 , ΔY 允许 ), the X-ray probe is used to perform perspective with the i-th hole as the center, and the coordinate value of the hole center is (X i ,Y i ), according to the hole center and the nozzle hole radius R determined for the i-th time 测嘴 Process the nozzle hole.

2. The method for processing a pressure measuring hole of an invisible interlayer cooling brazing component according to claim 1, characterized in that: The first marking and positioning tool comprises a first positioning block (11), a first marking plate (12), a first fastening screw (13) and a second fastening screw (14); the first positioning block (11) comprises an outer positioning ring (112) and a first block (113) which are fixedly connected; the outer positioning ring (112) comprises a first ring body and a second ring body which are integrally connected; the second ring body is used to be inserted into the inner side of the inner wall (2); the first ring body is connected to one end of the second ring body and abuts against the top of the inner wall (2); A block (113) is located on a side of the first ring body away from the second ring body, a first fastening screw (13) is threadedly connected to the second ring body, and an end of the first fastening screw (13) abuts against an inner surface of the inner wall (2), a groove is provided on the first block (113), a first scoring plate (12) is placed in the groove, a second fastening screw (14) is threadedly connected to the first block (113), and one end extends into the groove, and two ends of the first scoring plate (12) are respectively located on the inner side and the outer side of the inner wall (2).

3. A method for processing a pressure measuring hole of an invisible interlayer cooling brazing component according to claim 2, characterized in that: The step 2 comprises: The first positioning block (11) is inserted into the inner side of the inner wall (2), and the first positioning block (11) is rotated to bring one end of the first scoring plate (12) into close contact with the boss on the outer surface of the inner wall (2), and the first fastening screw (13) is rotated to tighten the outer positioning ring (112) of the first positioning block (11) with the inner wall (2), and the position of the first scoring plate (12) is moved to bring the other end of the first scoring plate (12) into close contact with the inner surface of the inner wall (2), and the second fastening screw (14) is rotated to tighten the first scoring plate (12) with the first positioning block (11), and the outer contour of the contact area is traced, and the center of the outer contour is determined, and the center is used as the center mark of the pressure measuring boss (21) on the inner surface of the inner wall (2).

4. The method for processing a pressure measuring hole of a brazing component with invisible interlayer cooling according to claim 1, characterized in that: The second marking and positioning tool comprises a second positioning block (21), a second marking plate (22), a third fastening screw (23), and a fourth fastening screw (24); the second positioning block (21) comprises an inner positioning ring (212) and a second block (213); the inner positioning ring (212) comprises a third ring body and a fourth ring body which are integrally connected; the fourth ring body is located outside the outer surface of the outer wall (1); the third ring body is connected to the end of the fourth ring body and abuts against the end of the outer wall (1); the second block (213) 13) is located on the side of the third ring body away from the fourth ring body, the third fastening screw (23) is threadedly connected to the fourth ring body, and the end of the third fastening screw (23) abuts against the outer surface of the outer wall (1), the second block (213) is provided with a groove, the second scoring plate (22) is placed in the groove, the fourth fastening screw (24) is threadedly connected to the second block (213), and one end extends into the groove, and the two ends of the second scoring plate (22) are respectively located on the inner side of the inner wall (2) and the outer side of the outer wall (1).

5. The method for processing a pressure measuring hole of a brazing component with invisible interlayer cooling according to claim 4, characterized in that: The step 4 comprises: installing the second positioning block (21) into the outer wall (1) of the brazing component using the end face of the outer wall (1) as a positioning reference, adjusting the circumferential position of the second positioning block (21), tightly connecting one end of the second scoring plate (22) with the score line of step 2 on the inner surface of the inner wall (2) of the brazing component, tightening the second positioning block (21) and the brazing component by means of a third fastening screw (23), moving the position of the second scoring plate (22), tightly contacting the other end of the second scoring plate (22) with the outer surface of the outer wall (1) of the brazing component, tightening the second scoring plate (22) and the second positioning block (21) by means of a fourth fastening screw (24), drawing the outer contour of the contact area, determining the center of the outer contour, and using the center as the center score line of the pressure measuring boss (21) on the outer surface of the outer wall (1) of the brazing component.

6. The method for processing a pressure hole of a brazing component with invisible interlayer cooling according to claim 1, characterized in that: The fluoroscopy uses an X-ray probe.

7. The method for processing a pressure measuring hole of a brazing component with invisible interlayer cooling according to claim 1, characterized in that: R1≤1 / 5R 凸台 , R 凸台 is the radius of the pressure measuring boss (21).

8. The method for processing a pressure measuring hole of a brazing component with invisible interlayer cooling according to claim 1, characterized in that: The size of the hole after expansion in step 7 R 测嘴 is the radius of the nozzle hole (22).

9. The method for processing a pressure measuring hole of a brazing component with invisible interlayer cooling according to claim 1, characterized in that: In step 9, ΔX=X2-X1,ΔY=Y2-Y1,ΔX 允许 =(R 凸台 -R 测嘴 )×R,ΔY 允许 =(R 凸台 -R 测嘴 )×R, R is the X-ray detection system error, Size after expansion .

10. The method for processing a pressure hole of a brazing component with invisible interlayer cooling according to claim 1, characterized in that: In the step 10, ΔX i =X i -X i-1 ,ΔY=Y i -Y i-1 , (X i , Y i ) is the center of the hole after the i-th expansion, (X i-1 , Y i-1 ) is the center of the hole after the i-1th expansion.

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