Device and method for correcting roundness of pipe orifice of aero-engine pipeline and application

Abstract

The invention belongs to the technical field of aero-engine pipeline opening correction, and relates to an aero-engine pipeline opening roundness correction device and method and application, the aero-engine pipeline opening roundness correction device comprises an opening correction clamp left half part and an opening correction clamp right half part, and the opening correction clamp left half part and the opening correction clamp right half part are detachably connected; the auxiliary clamping device comprises a base, a lead screw, a fixed clamp and a movable clamp, when the pipe orifice roundness correction device is used, the pipe orifice roundness correction device is placed between the fixed clamp and the movable clamp, the movable clamp moves in the axial direction of the lead screw by driving the lead screw, and clamping or loosening of the pipe orifice roundness correction device is achieved; by arranging the combined structure of the pipe orifice roundness correction device and the auxiliary clamping device and adopting the mode that the auxiliary clamping device applies external force to the roundness correction device, clamping of a part is achieved, the problem of secondary deformation caused by uneven stress in a traditional roundness correction method is solved, the roundness of a pipe orifice is guaranteed, and the product quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of nozzle correction of aircraft engine pipelines, and relates to a device, method and application for correcting the roundness of the nozzle of an aircraft engine pipeline. Background Art

[0002] As the aviation industry's requirements for engine thrust-to-weight ratio continue to increase, in order to meet the development trend of aircraft engine weight reduction, the structural design of the engine has gradually become compact, and compact structural design has become the main development trend. While this design change brings performance improvements, it also triggers new challenges for the layout of the piping system.

[0003] The aviation engine piping system is a vital component of the engine, and its performance directly impacts the engine's performance, lifespan, and safety. As the main artery of the engine piping system, the fuel pipeline is particularly important for reliable quality and good performance.

[0004] As aircraft engines pursue weight reduction to improve performance and reduce energy consumption, their structural design is evolving towards compactness. While this compact design brings many advantages, it also poses a huge challenge to the layout of external piping. Due to space constraints, pipelines have to be arranged more densely, and the distance between them is significantly shortened. Moreover, the straight sections of the pipeline welding parts also become shorter, which not only increases the difficulty of welding operations, but also places more stringent requirements on the precision and quality of the welding process. How to ensure the reliability and stability of pipeline welding in a limited and complex space has become a key problem that needs to be overcome in the field of aircraft engine manufacturing. At present, the manufacture of aircraft engine oil pipelines mainly adopts the traditional combination fixture manufacturing method. This method has problems such as the combination fixture is expensive, time-consuming and labor-intensive, low precision, easy misalignment, low processing efficiency, difficult inspection, and low product quality consistency.

[0005] CN115592245A discloses an integrated process for positioning and automatic welding of small-diameter pipelines in aircraft engines. This method involves installing a positioning device on the welding head of an all-position automatic pipeline welder, including a left positioning assembly and a right positioning assembly. These components cooperate to achieve angular positioning of the joint and pipeline, ensuring close contact between the joint and the pipeline end face. The welding head then performs welding of the small-diameter pipeline and joint. This method achieves precise positioning welding without the need for secondary assembly and correction. However, this patent still suffers from issues such as the incomplete structure and functionality of the positioning device, making it difficult to adapt to complex small-diameter pipeline and joint structures. CN109500151A discloses a tool for rounding and butting steel pipes. The tool comprises a first half-ring, a second half-ring, an ear plate, and a locking member. The first and second half-rings engage with the deformed steel pipe ends to forcibly restore the deformed steel pipe ends to a circular shape. This tool has a simple, convenient, and efficient structure, and can address the issues of aligning the center positions of two butting pipe ends and the deformation of steel pipe ends. However, this patent still has the problem that the tooling structure and design are not optimized enough, and it is difficult to adapt to the rounding and docking of steel pipes with different diameters.

[0006] To meet the growing trend of aircraft engine weight reduction, engine structural designs are becoming increasingly compact, resulting in denser external piping and shorter straight sections in pipe welds. Due to pipe curvature, pipe ends near the bend tend to deform into an elliptical shape. This not only affects the assembly of the fitting and pipe, but also easily causes weld misalignment, impacting product quality and posing a safety hazard. Existing methods for rounding pipe ends primarily rely on manual tapping or a small hydraulic calibrator to round the pipe end. This is cumbersome, labor-intensive, and has a low pass rate. Summary of the Invention

[0007] In response to the problems existing in the prior art, the present invention provides a device, method and application for correcting the roundness of the pipe mouth of an aircraft engine pipeline, which can quickly correct the roundness of the pipe mouth and improve the product welding quality, qualification rate and processing efficiency.

[0008] This is achieved through the following technical solutions: A device for correcting the roundness of an aero-engine pipe nozzle, comprising a pipe nozzle roundness correction device and an auxiliary clamping device; The pipe mouth rounding device comprises a left half of a mouth aligning fixture and a right half of a mouth aligning fixture, and the left half of the mouth aligning fixture and the right half of the mouth aligning fixture are detachably connected; The auxiliary clamping device includes a base, a screw, a fixed clamp and a movable clamp, and is used to apply a clamping force to the pipe orifice rounding device; the fixed clamp is fixed to one end of the base, the movable clamp is movably mounted on the base, and the screw is passed through the other end of the base and is movably connected to the movable clamp; When in use, the pipe mouth rounding device is placed between the fixed clamp and the movable clamp, and the movable clamp is moved along the axial direction of the screw by driving the screw to achieve the clamping or loosening of the pipe mouth rounding device; A plurality of semicircular grooves are symmetrically provided on the left half and the right half of the calibration fixture, and the semicircular grooves on both sides are closed to form a calibration hole.

[0009] Preferably, the correction holes on the left half of the calibration fixture and the right half of the calibration fixture are arranged in a straight line.

[0010] Preferably, the apertures of the correction holes are arranged at intervals of 0.05 mm according to the nominal size of the pipe, and the apertures of the correction holes are in a form of increasing or decreasing in sequence.

[0011] Preferably, the correction hole comprises at least 6 correction holes arranged in series, and the center distance between adjacent holes is 10-15 mm.

[0012] Preferably, the auxiliary clamping device further comprises a rotating handle, which is mounted on one end of a lead screw, and the lead screw passes through the base and is connected to the rotating handle.

[0013] Preferably, the movable clamp is threadedly connected to the lead screw.

[0014] The left half of the calibrating fixture and the right half of the calibrating fixture are symmetrically arranged and movably connected via a connecting pin.

[0015] Preferably, the pipe mouth rounding device is suitable for pipes of different specifications and can realize batch rapid correction.

[0016] A method for correcting the roundness of an aero-engine pipeline nozzle, using the aero-engine pipeline nozzle roundness correction device, comprises the following steps: Select the matching pipe rounding device according to the nominal size of the pipe to be calibrated; Measure the outer diameter of the pipe to be calibrated and select the calibration hole closest to the measured value; Place the end of the pipe to be calibrated into the corresponding calibration hole; The auxiliary clamping device applies a clamping force to the pipe mouth rounding device to restore the roundness of the deformed part of the pipe mouth.

[0017] Application of the pipe orifice roundness correction device for aircraft engine pipelines, the pipe orifice roundness correction device for aircraft engine pipelines is suitable for fuel pipelines, hydraulic pipelines and environmental control pipelines of aircraft engines, Compared with the prior art, the present invention has the following beneficial technical effects: The present invention realizes the clamping of parts by providing a combined structure of a pipe orifice rounding device and an auxiliary clamping device, and adopts a method of applying external force to the rounding device by the auxiliary clamping device, thereby avoiding the secondary deformation problem caused by uneven force in the traditional rounding method, ensuring the roundness of the pipe orifice and improving product quality; realizes rapid correction of the pipe orifice, overcomes the problems of cumbersome operation and high labor intensity of traditional manual hammering or hydraulic rounding machines, and significantly improves the efficiency of pipe orifice correction; by actually measuring the outer diameters of the same batch of pipe raw materials and selecting a position close to the measured value for rounding, the accuracy of pipe orifice rounding is ensured, errors caused by manual operation are avoided, and the welding qualification rate is effectively improved; The present invention adopts a design in which the aperture of the pipe orifice rounding device increases or decreases in intervals of 0.05 mm according to the nominal size of the pipe, and the holes are arranged evenly in a straight line. This structure can quickly and accurately find the position of the pipe orifice that needs to be corrected, ensuring the correction accuracy and effectively solving the problem of correction failure caused by thin inner wall in the prior art. The pipe mouth rounding device of the present invention is applicable to pipes of different specifications and can realize the demand of batch processing. It has strong versatility and practicality, meets the processing requirements of different pipe types, and improves production efficiency.

[0018] The present invention adopts a quick-replacement design, which reduces the installation and disassembly time of parts, improves production efficiency, and reduces the labor intensity of workers; through the precise positioning design and uniform force-bearing capacity of the pipe mouth rounding device, the weld misalignment phenomenon is effectively prevented, the product welding quality and consistency are significantly improved, and safety hazards are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the pipe mouth rounding device; Figure 2 Schematic diagram of the auxiliary clamping device; In the figure: base 1, rotating handle 2, screw 3, pipe mouth rounding device, fixed clamp 5, movable clamp 6, left half of the mouth rounding fixture 7, right half of the mouth rounding fixture 8, connecting pin 9. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] A device for correcting the roundness of the pipe opening of an aircraft engine pipe, such as Figure 1 and Figure 2 As shown, the pipe mouth rounding device includes a mouth rounding fixture left half 7 and a mouth rounding fixture right half 8, and the mouth rounding fixture left half 7 and the mouth rounding fixture right half 8 are detachably connected; the mouth rounding fixture is a rectangular block structure; The auxiliary clamping device includes a base 1, a screw 3, a fixed clamp 5, and a movable clamp 6, which are used to apply clamping force to the pipe orifice rounding device. The fixed clamp 5 is fixed to one end of the base 1, and the movable clamp 6 is movably mounted on the base 1. The screw 3 is provided through the other end of the base 1 and is movably connected to the movable clamp 6. The auxiliary clamping device also includes a rotating handle 2, which is mounted on one end of the screw 3. The screw 3 passes through the base 1 and is connected to the rotating handle 2. The movable clamp 6 is threadedly connected to the screw 3. The base 1 has a concave structure, and the fixed clamp 5 and movable clamp 6 are rectangular block structures. When in use, the pipe orifice rounding device is placed between the fixed clamp 5 and the movable clamp 6. By driving the screw 3, the movable clamp 6 moves axially along the screw 3 to achieve the clamping or loosening of the pipe orifice rounding device. The left and right halves of the calibrating fixture are symmetrically provided with multiple semicircular grooves, which are closed to form a calibration hole. The inner walls of the left and right halves of the calibrating fixture are provided with arcuate grooves that match the outer diameter of the pipe, and the radius of curvature of the arcuate grooves is equal to the radius of curvature of the outer cylindrical surface of the pipe.

[0023] The left half 7 and the right half 8 of the calibrating fixture are detachably connected by a connecting pin 9. The connecting pin 9 is made of high-strength alloy steel and has threads at both ends. The length of the connecting pin 9 is 1.2 times the diameter of the pipe mouth to ensure the stability and strength of the connection.

[0024] The inner surfaces of the left and right halves of the calibrating fixture (7), (8) are provided with a non-slip coating to prevent the pipe nozzle from slipping during the calibration process. Both halves (7) and (8) are made of aluminum alloy with a precision polished surface for excellent thermal conductivity and wear resistance.

[0025] The base 1 is made of cast iron and has an adjustable rubber pad at the bottom for fixing on the ground or work surface.

[0026] The rotating handle 2 is made of carbon steel, and its surface is quenched to improve its hardness and wear resistance. The lead screw 3 is made of high-strength alloy steel, and its surface is carburized to have good wear resistance and torsional resistance.

[0027] The fixed clamp 5 and the movable clamp 6 are made of stainless steel, and the surface is polished to ensure good fit with the outer surface of the pipe.

[0028] The clamping distance between the fixed clamp 5 and the movable clamp 6 of the auxiliary clamping device is adjustable to adapt to pipes of different specifications of the pipe mouth rounding device. The bottom of the base 1 is provided with an anti-slip rubber pad to enhance the stability of the device.

[0029] The diameter of the pipe rounding device increases or decreases in 0.05mm intervals according to the nominal pipe size, and the holes are arranged evenly in a straight line. The maximum diameter tolerance is controlled within ±0.02mm to ensure a good fit with pipes of different specifications. The pipe orifice rounding device operates as follows: first, the outer diameter of the pipe is measured using a measuring device. A hole position close to the measured value is selected for rounding, and the pipe end face is placed into the hole position that matches the outer diameter. Then, by rotating the handle 2 to drive the screw 3, the fixed clamp 5 and the movable clamp 6 apply pressure to the pipe orifice, restoring the roundness. Finally, while ensuring uniform force on the pipe orifice, an auxiliary clamping device applies external force to achieve rounding. Throughout this process, the orifice is positioned by the orifice diameter of the pipe orifice rounding device, avoiding errors caused by manual operation and ensuring calibration accuracy.

[0030] Embodiment 1: The present invention provides a method and device for calibrating the orifice of an aircraft engine pipeline. The device includes a pipe orifice rounding device and an auxiliary clamping device.

[0031] The pipe mouth rounding device includes a left half of the mouth aligning fixture 7, a right half of the mouth aligning fixture 8 and a connecting pin 9. The left half of the mouth aligning fixture 7 and the right half of the mouth aligning fixture 8 are both made of aluminum alloy, and the surface is precisely polished, with good thermal conductivity and wear resistance.

[0032] The inner walls of the left and right halves 7 and 8 of the calibrating fixture are designed with arcuate grooves that match the outer diameter of the pipe. The radius of curvature of the arcuate grooves is equal to the radius of curvature of the outer cylindrical surface of the pipe. A connecting pin 9, made of high-strength alloy steel and threaded at both ends, is used to detachably connect the left and right halves 7 and 8 of the calibrating fixture. The diameter of the pipe orifice rounding device increases or decreases in 0.05mm increments according to the nominal pipe size, and the holes are arranged evenly in a straight line. The maximum tolerance of the hole diameter is controlled within ±0.02mm to ensure a good fit with pipes of different specifications. The hole depth is 1.2-1.5 times the pipe wall thickness to ensure effective clamping of the pipe orifice. The auxiliary clamping device includes a base 1, a rotating handle 2, a screw 3, a fixed clamp 5, and a movable clamp 6. The base 1 is made of cast iron and has an adjustable rubber pad at the bottom for fixing to the ground. The rotating handle 2 is made of carbon steel and has a galvanized surface. The handle is designed based on ergonomic principles and conforms to the habitual grip of the human hand. The screw 3 is made of high-strength alloy steel and has a quenched surface, which has good wear resistance and torsion resistance. The fixed clamp 5 and movable clamp 6 are made of stainless steel and have a polished surface to ensure a good fit with the outer surface of the pipe.

[0033] The pipe orifice rounding device operates as follows: the pipe end is placed into a hole matching its outer diameter. Handle 2 is rotated to drive screw 3, causing fixed clamp 5 and movable clamp 6 to apply pressure to the pipe orifice, restoring its circular shape. Once the rounding is complete, a hydraulic cylinder drives the limit slider, disengaging the pipe orifice rounding device for quick replacement. The device also includes a displacement sensor for real-time monitoring of the pipe orifice's correction status to ensure the required accuracy. The displacement sensor utilizes a high-precision magnetic scale, capable of accuracy to 0.01 mm. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a component is referred to as being "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be an intermediate component at the same time. When a component is considered to be "set on" another component, it can be directly set on the other component or there can be an intermediate component at the same time.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in this industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A device for correcting the roundness of an aero-engine pipe nozzle, characterized in that: Including, pipe mouth rounding device and auxiliary clamping device; The pipe mouth rounding device comprises a left half of a mouth aligning fixture and a right half of a mouth aligning fixture, and the left half of the mouth aligning fixture and the right half of the mouth aligning fixture are detachably connected; The auxiliary clamping device includes a base, a screw, a fixed clamp and a movable clamp, and is used to apply a clamping force to the pipe orifice rounding device; the fixed clamp is fixed to one end of the base, the movable clamp is movably mounted on the base, and the screw is passed through the other end of the base and is movably connected to the movable clamp; When in use, the pipe mouth rounding device is placed between the fixed clamp and the movable clamp, and the movable clamp is moved along the axial direction of the screw by driving the screw to achieve the clamping or loosening of the pipe mouth rounding device; A plurality of semicircular grooves are symmetrically provided on the left half and the right half of the calibration fixture, and the semicircular grooves on both sides are closed to form a calibration hole.

2. The device for correcting the roundness of the nozzle of an aircraft engine pipeline according to claim 1, characterized in that: The correction holes on the left half of the calibration fixture and the right half of the calibration fixture are arranged in a straight line.

3. The device for correcting the roundness of the nozzle of an aircraft engine pipeline according to claim 1, characterized in that: The apertures of the correction holes are arranged at intervals of 0.05 mm according to the nominal size of the pipe, and the apertures of the correction holes are in a form of increasing or decreasing in sequence.

4. The device for correcting the roundness of the nozzle of an aircraft engine pipeline according to claim 3, characterized in that: The correction hole comprises at least 6 correction hole positions arranged continuously, and the center distance between adjacent hole positions is 10-15 mm.

5. The device for correcting the roundness of the nozzle of an aircraft engine pipeline according to claim 1, characterized in that: The auxiliary clamping device also includes a rotating handle, which is installed at one end of a lead screw, and the lead screw passes through the base and is connected to the rotating handle.

6. The device for correcting the roundness of the nozzle of an aircraft engine pipeline according to claim 1, characterized in that: The movable clamp is threadedly connected to the lead screw.

7. The device for correcting the roundness of the nozzle of an aircraft engine pipeline according to claim 1, characterized in that: The left half of the calibrating fixture and the right half of the calibrating fixture are symmetrically arranged and movably connected via a connecting pin.

8. The device for correcting the roundness of the nozzle of an aircraft engine pipeline according to claim 1, characterized in that: The pipe mouth rounding device is suitable for pipes of different specifications and can realize batch rapid correction.

9. A method for correcting the roundness of an aero-engine pipe nozzle, using the aero-engine pipe nozzle roundness correction device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Select the matching pipe rounding device according to the nominal size of the pipe to be calibrated; Measure the outer diameter of the pipe to be calibrated and select the calibration hole closest to the measured value; Place the end of the pipe to be calibrated into the corresponding calibration hole; The auxiliary clamping device applies a clamping force to the pipe mouth rounding device to restore the roundness of the deformed part of the pipe mouth.

10. Application of the device for correcting the roundness of the nozzle of an aircraft engine pipeline according to any one of claims 1 to 8, characterized in that: The pipe orifice roundness correction device for an aircraft engine pipeline is suitable for a fuel pipeline, a hydraulic pipeline and an environmental control pipeline of an aircraft engine.

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