Afterburner main stabilizer calibration method and tool

Abstract

The present invention discloses a method and tool for correcting the main stabilizer of an afterburner. When the gap between the main stabilizer of the afterburner and the heat shield is insufficient for correction by dynamic knocking, the static pressure correction method is used to correct the main stabilizer. That is, in the state where the main stabilizer and the heat shield have been assembled, a correction tool is inserted into the gap between the outer side surface of the outer ring of the main stabilizer and the heat shield from one side of the V-shaped opening of the main stabilizer. At the same time, a correction tool is synchronously inserted between the inner side surface of the outer ring of the main stabilizer and the inner side surface of the inner ring of the main stabilizer. The correction tool includes two correction claws with conical working surfaces and guiding chamfers, and the two correction claws are connected by an operating rod. The present invention can implement correction when the gap is greater than or less than the specified requirement, and can avoid damage, shape error and hard injury caused by impact during the correction process, ensuring that the requirements of the drawing are met.

Description

Technical Field

[0001] The present invention belongs to the field of assembly technology, and particularly relates to a method and tool for correcting the main stabilizer of an afterburner. Background Art

[0002] As Figure 1 shown, it is a local schematic diagram of an aero-engine convergent-divergent afterburner component. The afterburner component is an annular structural part, mainly composed of an afterburner casing assembly, a heat shield, a main stabilizer assembly, etc. The casing assembly, heat shield, and main stabilizer assembly are sheet metal welded parts. The design drawing requires that the gap between the outer side of the main stabilizer and the heat shield be X after assembly. Due to the low precision of sheet metal welded parts and large dimensional accumulation errors during assembly, the assembly cannot directly meet the design gap requirements and must be corrected to meet the requirements. Since the profile of the heat shield single piece has been guaranteed, the design drawing does not allow correction.

[0003] The main stabilizer is as Figure 2 shown. The main stabilizer is an annular structural part, with a V-shaped cross-section, that is, the outer side is a conical surface. The length of the conical generatrix L1 is 51 mm, the material thickness δ is 1.5 mm, α is the V-shaped angle, and α = 30 0 ±2 0 , with a relatively large tolerance. The design drawing requires ensuring the overall drawing gap and allows correcting the main stabilizer during assembly.

[0004] The main stabilizer is located in the middle of the inner cavity of the afterburner, at a distance of L1 = 230 mm from the right end and close to the heat shield. When assembling, when the gap X between the outer side of the main stabilizer and the heat shield is large , that is, greater than 31.2, a copper rod can be used in cooperation with a hammer to perform knocking correction from the inner side of the main stabilizer. During the correction process, due to the impact, scars will be generated on the inner side of the stabilizer, and in severe cases, pits will appear; when the gap X between the outer side of the main stabilizer and the heat shield is small , that is, less than 28.2, due to space limitations, the hammer cannot be waved, that is, physical kinetic energy cannot be generated, so the knocking correction method cannot be used in the assembled state of the component. Technologically, only the position with a small gap can be marked first, disassembled, corrected, and then assembled. Sometimes, it cannot be corrected in place in one time and there is a repeated process. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention aims to provide a method and tool for correcting the main stabilizer of an afterburner. The correction surface of the designed correction tool fits the outer side profile of the main stabilizer, enabling correction to be carried out when the gap is greater than or less than the specified requirements, and avoiding damage caused by impact during the correction process. At the same time, it can avoid shape errors and hard injuries caused by correction and ensure the requirements of the drawing.

[0006] The basic idea of the present invention is as follows: The static pressure correction method is adopted to implement the correction method for the assembly of the main stabilizer in the afterburner. A correction tool is designed, and the corrected surface of the tool fits the outer surface of the main stabilizer. No matter what the gap between the outer side of the main stabilizer and the heat shield is after assembly, it can be corrected, and shape errors and hard injuries are avoided in the axial and circumferential directions to ensure the requirements of the drawing.

[0007] The present invention adopts the following technical solutions:

[0008] For the correction method of the main stabilizer of the afterburner, when the gap between the main stabilizer of the afterburner and the heat shield is not enough to be corrected by the dynamic knocking method, the static pressure correction method is adopted to correct the main stabilizer. The static pressure correction method includes:

[0009] In the state where the main stabilizer and the heat shield have been assembled, a correction tool is inserted into the gap between the outer surface of the outer ring of the main stabilizer and the heat shield from one side of the V-shaped opening of the main stabilizer. At the same time, a correction tool is synchronously inserted between the inner surface of the outer ring of the main stabilizer and the inner surface of the inner ring of the main stabilizer.

[0010] An afterburner main stabilizer correction tool for the above correction method, including a first correction claw, a second correction claw and an operating rod;

[0011] The thickness of the first correction claw is less than the gap between the outer surface of the outer ring of the main stabilizer and the heat shield, and includes:

[0012] A first working surface for correcting the outer surface of the outer ring of the main stabilizer. The first working surface is an inner conical surface. The cone angle and curvature radius of the inner conical surface are equal to the parameters of the outer surface of the outer ring of the main stabilizer, and the length of the inner conical surface is equal to the length of the conical generatrix of the outer ring of the main stabilizer;

[0013] A first chamfer, which is located at one end of the first working surface inserted into the main stabilizer;

[0014] A boss, which is located at one end of the first working surface away from the first chamfer;

[0015] The second correction claw includes:

[0016] A second working surface for correcting the inner surface of the outer ring of the main stabilizer. The second working surface is an outer conical surface. The cone angle and curvature radius of the outer conical surface are equal to the parameters of the inner surface of the outer ring of the main stabilizer, and the length of the outer conical surface is equal to the length of the conical generatrix of the outer ring of the main stabilizer;

[0017] A second chamfer, which is located at one end of the second working surface inserted into the main stabilizer;

[0018] A groove matching the boss, which is located at one end of the second working surface away from the second chamfer;

[0019] The operating rod is connected to the first correction claw and the second correction claw at the same time, and the connection point is located at the end where the boss of the first correction claw is located and the end where the groove of the second correction claw is located.

[0020] Furthermore, a third chamfer is processed on the surface of one end of the first correction claw corresponding to the boss.

[0021] Furthermore, a fourth chamfer is processed on the non-second working surface surface of the end of the second correction claw inserted into the main stabilizer.

[0022] As an option, the first chamfer angle and the second chamfer angle are equal to half of the V-angle of the main stabilizer ±1°.

[0023] As an option, the operating rod is a round rod.

[0024] As an option, the first correction claw, the second correction claw and the operating rod are made of 45 steel in a quenched and tempered state.

[0025] As an option, the operating rod is welded to the first correction claw and the second correction claw at the same time, and a thick plate is placed between the first working surface of the first correction claw and the second working surface of the second correction claw during the welding process, and the thickness of the thick plate is greater than the thickness of the outer ring of the main stabilizer.

[0026] The correction tool and correction method of the present invention have the following characteristics:

[0027] (1) Surface correction is adopted to avoid block-shaped protrusions, ridge-shaped protrusions and other defects on the main stabilizer surface. The working surfaces of the two correction claws are precisely processed by CNC milling to form a conical surface that is the same as the outer ring surface of the main stabilizer;

[0028] (2) The correction tool is manufactured by splitting and then combining, that is, the two correction surfaces are designed to be milled on the two correction claws respectively, and then positioned and combined through grooves and bosses, and finally welded into one body, which reduces the manufacturing difficulty on the one hand and improves the processing accuracy of the working surface on the other hand;

[0029] (3) The correction is performed by inserting two correction working surfaces simultaneously from the V-shaped opening of the main stabilizer. On the one hand, the outer ring of the main stabilizer is restricted between the two working surfaces to ensure that no other defects will be generated during the correction process. On the other hand, the extrusion effect of the profile correction is generated during the insertion process.

[0030] (4) There is no need to disassemble the main stabilizer and the heat shield. Even when the gap X value is very small, the outer ring of the main stabilizer can be corrected in the assembled state, reducing unnecessary disassembly and assembly operations;

[0031] (5) The correcting force and moment include the extrusion force normal to the working surfaces of the two correcting claws, the extrusion force in the direction of the generatrix of the working surface of the correcting claw (the generatrix of the conical surface) during the insertion of the two correcting claws, and the correcting moment generated by the operating rod relative to the V-shaped tip of the main stabilizer when clamping the outer ring of the main stabilizer by the two correcting claws (i.e., reducing or enlarging the V-shaped angle α).

[0032] Compared with the prior art, under the premise that impact correction cannot be implemented due to space limitations, the present invention designs and manufactures a correcting tool. The working surface of the correcting tool fits the surface of the main stabilizer. Whether the gap is greater than or less than the requirements of the design drawing, correction can be implemented, ensuring the axial and circumferential shape accuracy of the corrected surface and avoiding the situation of hard damage caused by correction knocking. Brief Description of the Drawings

[0033] Figure 1 is a schematic diagram of the variable-area afterburner component of the aeroengine related to the present invention;

[0034] Figure 2 is a schematic diagram of the structure of the main stabilizer;

[0035] Figure 3 is a schematic diagram of the combined welding of the correcting tool of the present invention;

[0036] Figure 4 is a schematic diagram of the structure of the correcting claw A of the correcting tool of the present invention;

[0037] Figure 5 is a schematic diagram of the structure of the correcting claw B of the correcting tool of the present invention. Detailed Embodiment

[0038] The present invention will be further described below in conjunction with the drawings and specific embodiments. However, it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, all modifications, substitutions, and changes made according to ordinary technical knowledge and customary means in the art are included in the scope of the present invention.

[0039] As Figure 1 shown, it is a variable-area afterburner component of an aeroengine. The afterburner component is an annular structural assembly, mainly composed of a combustion chamber casing assembly, a heat shield, a main stabilizer assembly, etc. The combustion chamber casing assembly, the heat shield, and the main stabilizer assembly are sheet metal welded parts. The design drawing requires that the gap between the outer side of the main stabilizer and the heat shield be X after assembly. The main stabilizer is an annular sheet metal structural part, with a cross-section in a "V" shape, and the outer side is a conical surface, and the generatrix length of the conical surface is L1.

[0040] As Figures 2 to 5As shown in the figure, for the correction problem of the main stabilizer of the afterburner, the basic principle of the adopted correction method is as follows: The static pressure correction method is adopted, and a correction tool is designed. The structural dimensions of the working part of the correction tool are designed based on the main stabilizer. The correction tool is designed according to the outer ring structure dimension of the main stabilizer. During correction, the correction tool and the outer ring of the stabilizer are in surface contact to ensure the axial and circumferential shape accuracy of the correction surface and avoid hard injuries caused by knocking during correction.

[0041] Figures 1 to 5 Among them, X is the assembly clearance requirement between the outside of the main stabilizer of the afterburner component and the heat shield, L2 is the axial dimension of the main stabilizer from the rear end face of the combustion chamber casing, δ is the thickness of the main stabilizer material, L1 is the length of the outer conical generatrix of the main stabilizer, α is the V-shaped angle of the main stabilizer, A1 is the working surface of the correction claw A, La is the length of the working surface A, δa is the thickness of the correction claw A, αa is the guiding chamfer, ha is the step height, Sa is the step width, Ra is the back transition fillet, B1 is the working surface of the correction claw B, Lb is the length of the working surface B, δb is the thickness of the correction claw B, αb is the guiding chamfer, hb is the groove depth, Sb is the width of the groove, and Rb is the back fillet at the front end of the correction claw B.

[0042] After assembly, it is required that the clearance between the outside of the main stabilizer and the heat shield after assembly is The main stabilizer is an annular structural part, and its cross-section is V-shaped, that is, the outer side is a conical surface. The length of the conical generatrix L1 is 51 mm, the material thickness δ = 1.5, and the V-shaped angle α = 30 0 .

[0043] The correction scheme of the present invention is as follows:

[0044] 1. Design a correction tool. The material of the correction tool is selected as 45 steel in a quenched and tempered state. The correction tool mainly consists of three parts: a correction claw A, a correction claw B, and an operating rod C.

[0045] The correction claw A, as Figure 4 shown, A1 is the working surface, and its shape is an inner conical surface. The cone angle and curvature radius are equal to the parameters of the outer surface of the outer ring of the stabilizer. The length La is equal to the length of the conical generatrix L1 of the outer ring of the stabilizer, La = 51 mm. The thickness δa of the correction claw A is equal to the clearance X - 10 mm ∽ 15 mm. In this embodiment, δa is taken as 18 mm (to ensure that the correction claw A can be smoothly inserted into the clearance X). The right end is a "convex" step structure. The left end of the working surface A1 is a chamfer αa, αa = (α / 2) ± 1 0 = 15 0 ± 1 0 , the step height ha and width Sa are symmetrically designed, and the dimensions are determined according to needs. The back transition part is ground into a transition fillet Ra according to needs to prevent interference, and the size is determined according to needs.

[0046] The correction claw B, as Figure 5As shown, B1 is the working surface, which is in the shape of an outer conical surface. The cone angle, curvature radius are equal to the inner surface parameters of the stabilizer outer ring, and the length Lb is equal to the length L1 of the conical generatrix of the stabilizer outer ring. Lb = 51mm. The thickness δb of the correction claw is determined according to the size of the V-groove of the main stabilizer. The right end is a "concave" step structure. The left end of the correction claw B has a chamfer αb, and αb = (α / 2) ± 1 0 = 15 0 ±1 0 , the step height hb = ha - (δ + 0.5), the width Sb = Sa. The front end of the back is ground into a transition fillet Rb as needed to prevent interference, and others are determined according to needs

[0047] The operating rod C is rod

[0048] Welding: Assemble the correction claw A, correction claw B and operating rod C according to the drawing, such as Figure 4 for welding. When welding, a plate with the same size as the outer ring of the stabilizer ring and a thickness equal to δ + 0.5mm is placed between the working surface A1 of the correction claw A and the working surface B1 of the correction claw B. The function of this plate is to ensure that the working surface gap between the correction claw A and the correction claw B can be smoothly inserted into the outer ring of the main stabilizer

[0049] 2. Calibration: Guided by the chamfers (two guiding angles αa and αb) at the opening of the calibration tool, quickly insert the calibration tool from one side of the V-shaped opening of the main stabilizer into the outer ring of the main stabilizer to the limit position. Calibrate inwards or outwards according to the actual measured gap (that is, hold the outer ring of the main stabilizer with the correction claw A and the correction claw B, and then swing through the operating rod C. Swing inwards corresponding to Figure 2 in which the V-shaped angle α is reduced and the gap X is increased, and swing outwards corresponding to Figure 2 in which the V-shaped angle α is enlarged and the gap X is reduced) to obtain the required gap X between the outer ring of the main stabilizer and the heat shield. During the calibration process, the gap X can be measured by measuring means to check whether it meets the requirements, that is, measure and verify while calibrating, and adjust the calibration direction of the calibration tool according to the measured X value

[0050] The content not described in detail in the specification of the present invention belongs to the prior art well-known to those skilled in the art. Although the illustrative specific embodiments of the present invention have been described above for the convenience of those skilled in the art to understand the present invention, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection

Claims

1. Afterburner main stabilizer correction method, characterized in that: When the gap between the main stabilizer of the afterburner and the heat shield is not sufficient to be corrected by the method of dynamic knocking, the static pressure correction method is used to correct the main stabilizer. The static pressure correction method includes: In the state where the main stabilizer and the heat shield have been assembled, insert the correction tool into the gap between the outer surface of the outer ring of the main stabilizer and the heat shield from one side of the V-shaped opening of the main stabilizer. At the same time, insert the correction tool synchronously between the inner surface of the outer ring of the main stabilizer and the inner surface of the inner ring of the main stabilizer; The correction tool includes a first correction claw, a second correction claw and an operating rod; The thickness of the first correction claw is less than the gap between the outer surface of the outer ring of the main stabilizer and the heat shield, and includes: The first working surface for correcting the outer surface of the outer ring of the main stabilizer, the first working surface is an inner conical surface, the cone angle and the curvature radius of the inner conical surface are equal to the parameters of the outer surface of the outer ring of the main stabilizer, and the length of the inner conical surface is equal to the length of the conical generatrix of the outer ring of the main stabilizer; The first chamfer is located at one end of the first working surface inserted into the main stabilizer; The convex platform is located at one end of the first working surface far from the first chamfer; The second correction claw includes: The second working surface for correcting the inner surface of the outer ring of the main stabilizer, the second working surface is an outer conical surface, the cone angle and the curvature radius of the outer conical surface are equal to the parameters of the inner surface of the outer ring of the main stabilizer, and the length of the outer conical surface is equal to the length of the conical generatrix of the outer ring of the main stabilizer; The second chamfer is located at one end of the second working surface inserted into the main stabilizer; The groove matching the convex platform is located at one end of the second working surface far from the second chamfer; The operating rod is connected to the first correction claw and the second correction claw at the same time, and the connection part is located at the end where the convex platform of the first correction claw is located and the end where the groove of the second correction claw is located.

2. The afterburner main stabilizer calibration method according to claim 1, characterized in that: The third chamfer is machined on the surface of the first correction claw corresponding to the end of the convex platform.

3. The afterburner main stabilizer calibration method according to claim 1, characterized in that: The fourth chamfer is machined on the surface of the non-second working surface at one end of the second correction claw inserted into the main stabilizer.

4. The afterburner main stabilizer calibration method according to claim 1, characterized in that: The first chamfer and the second chamfer are equal to half of the V-angle of the main stabilizer ±1 0 .

5. The afterburner main stabilizer calibration method according to claim 1, characterized in that: The operating rod is a round rod.

6. The method for correcting the main stabilizer of the afterburner according to claim 1, wherein: The first correction claw, the second correction claw and the operating rod are made of 45 steel in a quenched and tempered state.

7. The method for correcting the main stabilizer of the afterburner according to claim 1, characterized in that: The operating rod is welded to the first correction claw and the second correction claw at the same time, and a thick plate is placed between the first working surface of the first correction claw and the second working surface of the second correction claw during the welding process. The thickness of the thick plate is greater than the thickness of the outer ring of the main stabilizer.

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