A tool and method for repairing deformation of a conical-to-conical seal joint in a pressure test

Abstract

The application discloses a kind of repair cone-to-cone sealing joint deformation in pressurization experiment tool and method, belong to sealing device technical field.Working tool includes nut, flared cone and cylindrical pin;The flared cone is located in the inner hole of the nut, the cylindrical pin is arranged between the nut and the flared cone, realize the axial location and the radial floating connection of the flared cone and the nut;The nut is sleeved on the joint to be repaired by thread connection during work.The working tool is compact in structure, the number of parts is less, only contains three main components of nut, flared cone and cylindrical pin, which is convenient for on-site quick assembly and disassembly, and does not need additional power tools, suitable for wing or off-wing repair scene of aero-engine pipeline, significantly reduces the maintenance cycle and cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of sealing devices, and relates to a tooling and method for repairing the deformation of a cone-to-cone sealing joint in a pressurization test. Background Art

[0002] As a key component for medium transportation and pressure transmission of an aero-engine pipeline system, the sealing reliability of pipeline joints directly determines the operation safety and service life of the whole engine. At present, the pipeline sealing connections of aero-engines mostly adopt a ball-cone sealing structure with a spherical surface and a conical surface matched, which has easily controllable matching precision and uniform stress, the conical port of the joint is not easy to deform after the pressurization test, with mature technical application and stable sealing performance. Compared with the conventional ball-cone sealing structure, the cone-to-cone matching sealing structure is an important form of special pipeline connection for aero-engines, which realizes combined end face and radial sealing by high-precision fitting of the inner and outer conical surfaces, and puts forward extremely high requirements for the machining coaxiality, fit tolerance and port morphology of the inner and outer conical surfaces. The outer conical port of such cone-to-cone sealing joint is mostly designed as a sharp-edge structure, with thin metal wall thickness and small material volume at the port position. During the pressure-bearing process of the whole engine and pipeline pressurization test, under the action of internal pressure load and structural stress, slight necking and closing deformation defects are very likely to occur, such as Figure 1 and Figure 2 shown in the figures. This kind of slight necking deformation is concealed: under the traditional ball-cone sealing assembly working condition, the spherical surface can adapt to the tiny deformation of the conical port in a self-adaptive manner, and the port deformation defect cannot be directly observed; but under the precise alignment assembly working condition of cone-to-cone, even a tiny necking deformation of the conical port will directly damage the matching precision of the inner and outer conical surfaces, causing subsequent problems such as assembly interference and alignment eccentricity, and in severe cases, the signal sensor matched with the pipeline cannot be smoothly installed into the inner hole of the conical surface, leading to cascading problems such as assembly blockage and pipeline sealing failure.

[0003] The existing conventional repair methods for the conical port necking deformation of the cone-to-cone sealing joint after the pressurization test generally adopt a reamer to bore and remove the excess deformed material at the necking position. However, this processing method will passively thin the base wall thickness of the joint port, and damage the material distribution and structural mechanical properties of the original design of the part; at the same time, mechanical reaming processing is easy to form an unstable grain boundary layer on the cutting surface, changing the local metallographic structure state of the port. Under the long-term service conditions of aero-engines with high pressure and alternating loads, it is very easy to induce grain boundary cracking, which extends to form fatigue cracks, and then causes hidden troubles such as pipeline leakage and transmission failure, and cannot meet the application requirements of deformation repair, structural integrity and long-term service reliability at the same time. Contents of the Invention

[0004] The purpose of this invention is to solve the technical problems in the prior art where cone-to-cone sealing joints are prone to slight shrinkage deformation at the port after pressure testing. Conventional reamer cutting repair methods thin the base material, damage the original structure and metallographic structure, and easily induce high-pressure cracks, assembly interference, and sensor installation failure. This invention provides a tooling and method for repairing cone-to-cone sealing joints deformed during pressure testing.

[0005] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention discloses a tooling for repairing the deformation of a cone-to-cone sealing joint during a pressure test, comprising a nut, a flared cone, and a cylindrical pin; the flared cone is disposed in the inner hole of the nut, and the cylindrical pin passes between the nut and the flared cone, thereby achieving axial limiting and radial floating connection between the flared cone and the nut; during operation, the nut is threaded onto the joint to be repaired.

[0006] Further improvements are made in the following aspects: The nut has an internal thread that matches the external thread of the connector. The end of the nut away from the connector has a stepped hole for accommodating the flared cone. The diameter of the stepped hole is larger than the outer diameter of the flared cone, forming a radial floating clearance.

[0007] The flared cone includes a guide section and a straightening section arranged coaxially; the guide section has a low-angle conical surface structure, the taper of the straightening section is consistent with the original inner taper of the cone-to-cone sealing joint, and the dimensional tolerance of the straightening section is not greater than 1 / 3 of the inner taper tolerance of the joint.

[0008] The taper of the guide section is 1.5°~3°, the maximum outer diameter of the guide section is less than the minimum inner diameter of the joint after the joint is shrunken and deformed, and the axial length of the straightening section is not less than the effective mating length of the inner conical surface of the joint.

[0009] The end of the flaring cone's calibration section is provided with a limiting step. The outer diameter of the limiting step is larger than the maximum theoretical diameter of the inner cone surface of the cone-to-cone sealing joint. This is used to limit the maximum feed depth of the flaring cone and prevent port expansion caused by overcalibration.

[0010] The tail of the flared cone is provided with an annular limiting groove. The cylindrical pin passes through the side wall of the nut and the annular limiting groove, which restricts the axial disengagement of the flared cone, while allowing the flared cone to float radially and deflect at an angle within the stepped hole of the nut.

[0011] The tail of the flared cone is provided with an operating surface for applying axial thrust. The operating surface cooperates with the end face of the nut. By tightening the nut, the flared cone is driven to feed axially toward the inner conical surface of the cone-to-cone sealing joint, thereby correcting the narrowing deformation.

[0012] Secondly, this invention discloses a method for repairing the deformation of a cone-to-cone sealing joint during a pressure test based on the above-mentioned tooling, comprising: Fit the nut onto the joint to be repaired, and align the flared cone with the inner conical surface of the joint; The nut is driven to rotate relative to the connector, causing the nut to move along the axial direction of the connector. At the same time, the flaring cone is driven to feed towards the inner conical surface of the connector, and the flaring cone is used to squeeze and correct the inner conical surface that has undergone shrinkage deformation. Rotate the nut in the opposite direction to remove the flared cone and complete the repair.

[0013] Before driving the flaring cone feed, the process also includes applying polishing paste or lubricant to the surface of the flaring cone's shaping section.

[0014] By controlling the number of turns or torque of the nut, the maximum feed depth of the flared cone is limited to avoid overcorrection.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a tooling for repairing deformation of a cone-to-cone sealing joint during a pressure test. A cylindrical pin enables axial positioning and radial floating connection between the flared cone and the nut, allowing the flared cone to float freely radially a certain distance within the nut's inner bore. This floating design automatically compensates for coaxiality deviations caused by machining or assembly when the tooling is threaded onto the joint to be repaired, ensuring uniform contact between the flared cone's conical surface and the joint's inner conical surface. This avoids localized overload or secondary scratches caused by rigid alignment, thereby improving the uniformity and reliability of the repair. The nut and joint are connected by a threaded drive; the operator only needs to rotate the nut to smoothly feed the flared cone axially. Compared to direct hammering or pressing, the threaded drive provides precise and controllable feed rate and extrusion force, preventing further deformation or cracking of the joint due to excessive impact force, achieving gentle and controllable correction of the constriction deformation. The tooling features a compact structure and a small number of parts, comprising only three main components: a nut, a flared cone, and a cylindrical pin. This facilitates rapid on-site assembly and disassembly without the need for additional power tools. It is suitable for on-wing or off-wing repairs of aircraft engine piping, significantly reducing maintenance time and costs. The cylindrical pin also serves as an anti-loosening element, preventing the flared cone from detaching from the nut when not in operation. During operation, the flared cone allows for adaptive floating based on the actual shape of the inner conical surface of the joint, ensuring both ease of operation and flexible adaptability during the repair process.

[0016] This invention discloses a method for repairing deformation of cone-to-cone sealing joints during pressurization tests. The method employs a correction principle combining threaded drive and radial floating. The operator simply places a nut on the joint to be repaired and rotates the nut to allow the flared cone to be smoothly fed axially. Simultaneously, the flared cone, under the action of the radial floating connection, automatically adapts to the actual axial position of the inner conical surface of the joint, ensuring that the correction force is evenly distributed across the entire conical surface. Compared to traditional straightening methods relying on hammering or pressing, this method effectively avoids excessive compression or secondary scratches on one side due to centering deviations, significantly improving the dimensional accuracy and surface quality of the repair. This method achieves precise controllability of the correction process. Because the threaded connection between the nut and the joint has self-locking characteristics and the feed amount is easily quantifiable (e.g., by controlling the number of rotations or torque), the operator can precisely control the feed depth and extrusion force of the flared cone, thus avoiding expansion or cracking of the inner conical surface port due to excessive feed, and also avoiding incomplete elimination of shrinkage deformation due to insufficient feed. This controllability makes this method particularly suitable for the on-site repair of sealing joints in aero-engine pipelines with extremely high precision requirements. This method is simple to operate and requires no disassembly of the entire piping system. Throughout the process, the tooling is directly fitted onto the outside of the joint, and the flared cone is fed in and out simply by rotating the nut in both directions. There is no need to remove the entire pipeline from the engine, nor is it necessary to use a hydraulic press or specialized pulling equipment. This significantly reduces maintenance downtime, lowers maintenance costs, and also reduces the risk of additional damage from repeated disassembly and reassembly. The method has good compatibility and repeatability. Because the dimensions of the flared cone's calibration section are strictly designed according to the original inner cone surface of the joint, and the radial floating connection allows for a certain installation deviation, this method is applicable to cone-to-cone sealing joints of different specifications and degrees of deformation. Furthermore, if the calibration effect is unsatisfactory the first time, the operator can repeat the "fitting—rotating feed—reverse withdrawal" steps until the inner cone surface of the joint returns to the shape and surface state that meets the sealing requirements, and each operation will not cause additional damage to the tooling or the joint. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a cone-to-cone sealing joint according to an embodiment of the present invention; Figure 2This is a schematic diagram of the structure of a cone-to-cone sealing joint before and after deformation in a pressure test according to an embodiment of the present invention; the dashed line part is the structure before deformation, and the solid line part is the structure after deformation. Figure 3 This is a schematic diagram of the structure of a tooling for repairing the deformation of a cone-to-cone sealing joint during a pressure test, according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the connection structure between a tooling for repairing deformation of a cone-to-cone sealing joint during a pressure test, as described in an embodiment of the present invention, and the cone-to-cone sealing joint during operation.

[0019] Wherein: 301-Connector; 302-Rounding tool; 3011-Structure before deformation; 3012-Structure after deformation; 201-Nut; 202-Flanged cone; 203-Cylindrical pin. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 3 and Figure 4This invention discloses a tooling for repairing deformation of a cone-to-cone sealing joint during a pressure test, comprising a nut 201, a flared cone 202, and a cylindrical pin 203. The flared cone 202 is disposed in the inner hole of the nut 201, and the cylindrical pin 203 passes between the nut 201 and the flared cone 202, achieving axial limiting and radial floating connection between the flared cone 202 and the nut 201. During operation, the nut 201 is threaded onto the joint 301 to be repaired. The inner hole of the nut 201 has an internal thread adapted to the external thread of the joint 301, and the end of the nut 201 away from the joint 301 has a stepped hole for accommodating the flared cone 202. The diameter of the stepped hole is larger than the outer diameter of the flared cone 202, forming a radial floating gap. The flared cone 202 includes a guide section and a straightening section coaxially arranged. The guide section has a low-angle conical surface structure, and the taper of the straightening section is consistent with the original inner taper of the cone-to-cone sealing joint 301. The dimensional tolerance of the straightening section is no greater than 1 / 3 of the inner taper tolerance of the joint. The taper of the guide section is 1.5°~3°. The maximum outer diameter of the guide section is less than the minimum inner diameter of the joint 301 after narrowing deformation, and the axial length of the straightening section is not less than the effective mating length of the inner conical surface of the joint 301. A limiting step is provided at the end of the straightening section of the flared cone 202. The outer diameter of the limiting step is greater than the maximum theoretical diameter of the inner conical surface of the cone-to-cone sealing joint 301, used to limit the maximum feed depth of the flared cone 202 and prevent port expansion due to over-correction. The tail of the flared cone 202 is provided with an annular limiting groove. The cylindrical pin 203 passes through the side wall of the nut 201 and the annular limiting groove, restricting the axial disengagement of the flared cone 202 while allowing the flared cone 202 to float radially and deflect angularly within the stepped hole of the nut 201. The tail of the flared cone 202 is provided with an operating surface for applying axial thrust. The operating surface mates with the end face of the nut 201. By tightening the nut 201, the flared cone 202 is driven to feed axially toward the inner conical surface of the cone-to-cone sealing joint 301, thereby correcting the constriction deformation.

[0027] This invention discloses a tooling for repairing deformation of a cone-to-cone sealing joint during a pressure test. A cylindrical pin enables axial positioning and radial floating connection between the flared cone and the nut, allowing the flared cone to float freely radially a certain distance within the nut's inner bore. This floating design automatically compensates for coaxiality deviations caused by machining or assembly when the tooling is threaded onto the joint to be repaired, ensuring uniform contact between the flared cone's conical surface and the joint's inner conical surface. This avoids localized overload or secondary scratches caused by rigid alignment, thereby improving the uniformity and reliability of the repair. The nut and joint are connected by a threaded drive; the operator only needs to rotate the nut to smoothly feed the flared cone axially. Compared to direct hammering or pressing, the threaded drive provides precise and controllable feed rate and extrusion force, preventing further deformation or cracking of the joint due to excessive impact force, achieving gentle and controllable correction of the constriction deformation. The tooling features a compact structure and a small number of parts, comprising only three main components: a nut, a flared cone, and a cylindrical pin. This facilitates rapid on-site assembly and disassembly without the need for additional power tools. It is suitable for on-wing or off-wing repairs of aircraft engine piping, significantly reducing maintenance time and costs. The cylindrical pin also serves as an anti-loosening element, preventing the flared cone from detaching from the nut when not in operation. During operation, the flared cone allows for adaptive floating based on the actual shape of the inner conical surface of the joint, ensuring both ease of operation and flexible adaptability during the repair process.

[0028] This invention discloses a method for repairing deformation of a cone-to-cone sealing joint during a pressure test, comprising: Step 1: Fit the nut 201 onto the connector 301 to be repaired, and align the flared cone 202 with the inner conical surface of the connector 301; before driving the flared cone 202 to feed, the following steps are also included: applying polishing paste or lubricant to the surface of the shaping section of the flared cone 202.

[0029] Step two: Drive the nut 201 to rotate relative to the connector 301, causing the nut 201 to move along the axial direction of the connector 301. At the same time, drive the flaring cone 202 to feed towards the inner conical surface of the connector 301. Use the flaring cone 202 to compress and correct the inner conical surface that has undergone narrowing deformation. By controlling the number of turns or torque of the nut 201, limit the maximum feed depth of the flaring cone 202 to avoid overcorrection.

[0030] Step 3: Rotate the nut 201 in the opposite direction to remove the flared cone 202 and complete the repair.

[0031] This invention discloses a method for repairing deformation of cone-to-cone sealing joints during pressurization tests. The method employs a correction principle combining threaded drive and radial floating. The operator simply places a nut on the joint to be repaired and rotates the nut to allow the flared cone to be smoothly fed axially. Simultaneously, the flared cone, under the action of the radial floating connection, automatically adapts to the actual axial position of the inner conical surface of the joint, ensuring that the correction force is evenly distributed across the entire conical surface. Compared to traditional straightening methods relying on hammering or pressing, this method effectively avoids excessive compression or secondary scratches on one side due to centering deviations, significantly improving the dimensional accuracy and surface quality of the repair. This method achieves precise controllability of the correction process. Because the threaded connection between the nut and the joint has self-locking characteristics and the feed amount is easily quantifiable (e.g., by controlling the number of rotations or torque), the operator can precisely control the feed depth and extrusion force of the flared cone, thus avoiding expansion or cracking of the inner conical surface port due to excessive feed, and also avoiding incomplete elimination of shrinkage deformation due to insufficient feed. This controllability makes this method particularly suitable for the on-site repair of sealing joints in aero-engine pipelines with extremely high precision requirements. This method is simple to operate and requires no disassembly of the entire piping system. Throughout the process, the tooling is directly fitted onto the outside of the joint, and the flared cone is fed in and out simply by rotating the nut in both directions. There is no need to remove the entire pipeline from the engine, nor is it necessary to use a hydraulic press or specialized pulling equipment. This significantly reduces maintenance downtime, lowers maintenance costs, and also reduces the risk of additional damage from repeated disassembly and reassembly. The method has good compatibility and repeatability. Because the dimensions of the flared cone's calibration section are strictly designed according to the original inner cone surface of the joint, and the radial floating connection allows for a certain installation deviation, this method is applicable to cone-to-cone sealing joints of different specifications and degrees of deformation. Furthermore, if the calibration effect is unsatisfactory the first time, the operator can repeat the "fitting—rotating feed—reverse withdrawal" steps until the inner cone surface of the joint returns to the shape and surface state that meets the sealing requirements, and each operation will not cause additional damage to the tooling or the joint.

[0032] The working principle of this invention is as follows: This invention provides a tooling and method for repairing the deformation of a cone-to-cone sealing joint during a pressure test. Utilizing the principle of metal extrusion deformation, a suitable flared cone is inserted into the conical opening of the deformed joint, and the deformed conical opening is rounded by tightening a nut. This is achieved through the following scheme: The calibrating fixture 302 includes a nut 201, a flared cone 202, and a cylindrical pin 203. The flared cone 202 and the nut 201 are designed as separate parts. The cylindrical pin 203 limits the flared cone 202 assembled on the nut.

[0033] Flaring Taper 202: The micro-taper angle of the flaring taper is (2°~3.5°)±1°, and the micro-taper length is 2±0.10cm. Its function is to guide the shaft of the shaping part smoothly into the deformed hole. The shaft size of the shaping part should be larger than the theoretical size of the joint hole. Taking the general tolerance HB5800-2021 as an example, for example, if the diameter of the hole is Ф4... +0.12 Then the dimension of the shaft in the calibration section should be Ф4. +0.04 That is, the theoretical dimensions are the same, and the tolerance zone is selected as 1 / 3 of the hole diameter tolerance to be calibrated. If the tolerance zone is too wide, the hole diameter will be locally expanded and deformed after calibration. If the tolerance zone is too narrow, the deformed opening cannot be calibrated properly, and there is still a risk of interference in the later assembly.

[0034] Nut 201: The thread size of the nut should match the external thread size of the connector 301. The gap between the limiting hole of the flared cone 202 and the outer diameter of the flared cone is 0.5±0.1cm, so that the flared cone can swing and rotate freely on the nut without excessive swing. This structure allows the flared cone to flexibly adjust according to the deformation of the hole diameter. The nut only provides a pulling force for the flared cone to enter the inner hole.

[0035] The following steps are involved in its use: 1. Insert the flared cone 202 of the rounding fixture into the cone opening of the deformed connector 301.

[0036] 2. Connect the nut 201 of the rounding fixture to the threaded connection of the connector 301.

[0037] 3. Tighten the nut 201 to allow the flared cone 202 to enter the cone opening of the deformed connector 301. By increasing the size of the rear end of the flared cone 202, the deformed cone opening that has narrowed is rounded, and the original size of the connector 301 is restored.

[0038] The present invention is easy to operate and does not damage the parts. It maintains the integrity of the material around the hole and does not weaken the structural strength around the hole. It can better withstand external forces in subsequent use and maintain the performance of the parts.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tooling for repairing deformation of a cone-to-cone sealing joint during a pressure test, characterized in that, It includes a nut (201), a flared cone (202), and a cylindrical pin (203); the flared cone (202) is disposed in the inner hole of the nut (201), and the cylindrical pin (203) passes between the nut (201) and the flared cone (202), so as to realize the axial limiting and radial floating connection between the flared cone (202) and the nut (201); when working, the nut (201) is threaded onto the joint (301) to be repaired.

2. The tooling for repairing the deformation of the cone-to-cone sealing joint during the pressure test as described in claim 1, characterized in that, The inner hole of the nut (201) is provided with an internal thread that is compatible with the external thread of the connector (301). The end of the nut (201) away from the connector (301) is provided with a stepped hole for accommodating the flared cone (202). The diameter of the stepped hole is larger than the outer diameter of the flared cone (202), forming a radial floating gap.

3. The tooling for repairing the deformation of the cone-to-cone sealing joint during the pressure test as described in claim 1, characterized in that, The flared cone (202) includes a guide section and a straightening section arranged coaxially; the guide section is a low-angle conical surface structure, the taper of the straightening section is consistent with the original inner taper of the cone-to-cone sealing joint (301), and the dimensional tolerance of the straightening section is not greater than 1 / 3 of the inner taper tolerance of the joint.

4. The tooling for repairing the deformation of the cone-to-cone sealing joint during the pressure test as described in claim 3, characterized in that, The taper of the guide section is 1.5°~3°, the maximum outer diameter of the guide section is less than the minimum inner diameter of the connector (301) after shrinkage deformation, and the axial length of the straightening section is not less than the effective mating length of the inner conical surface of the connector (301).

5. The tooling for repairing the deformation of the cone-to-cone sealing joint during the pressure test as described in claim 3, characterized in that, The end of the calibration section of the flared cone (202) is provided with a limiting step. The outer diameter of the limiting step is greater than the maximum theoretical diameter of the inner cone surface of the cone-to-cone sealing joint (301). This is used to limit the maximum feed depth of the flared cone (202) and prevent port expansion caused by overcalibration.

6. The tooling for repairing the deformation of the cone-to-cone sealing joint during the pressure test as described in claim 1, characterized in that, The tail of the flared cone (202) is provided with an annular limiting groove. The cylindrical pin (203) passes through the side wall of the nut (201) and the annular limiting groove, which restricts the axial disengagement of the flared cone (202) and allows the flared cone (202) to float radially and deflect at an angle within the stepped hole of the nut (201).

7. The tooling for repairing the deformation of the cone-to-cone sealing joint during the pressure test as described in claim 1, characterized in that, The tail of the flared cone (202) is provided with an operating surface for applying axial thrust. The operating surface cooperates with the end face of the nut (201). By screwing the nut (201), the flared cone (202) is driven to feed axially toward the inner cone surface of the cone-to-cone sealing joint (301) to correct the constriction deformation.

8. A method for repairing the deformation of a cone-to-cone sealing joint in a pressure test using the tooling described in any one of claims 1-7, characterized in that, include: Fit the nut (201) onto the joint (301) to be repaired, and align the flared cone (202) with the inner conical surface of the joint (301); The nut (201) is driven to rotate relative to the connector (301), causing the nut (201) to move along the axial direction of the connector (301), while simultaneously driving the flared cone (202) to feed into the inner conical surface of the connector (301), and using the flared cone (202) to squeeze and correct the inner conical surface that has undergone shrinkage deformation; Rotate the nut (201) in the opposite direction to remove the flared cone (202) and complete the repair.

9. The method for repairing the deformation of a cone-to-cone sealing joint during a pressure test according to claim 8, characterized in that, Before driving the flaring cone (202) to feed, the method further includes: applying polishing paste or lubricant to the surface of the flaring cone (202) in the shaping section.

10. The method for repairing the deformation of a cone-to-cone sealing joint during a pressure test according to claim 8, characterized in that, By controlling the number of turns or torque of the nut (201), the maximum feed depth of the flared cone (202) is limited to avoid overcorrection.

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