A locking tool and method for annular locking tabs in a fairing assembly

Abstract

The present application relates to the technical field of aero-engine assembly, and particularly relates to a locking tool and method for an annular locking piece in a fairing assembly. The locking tool comprises a deformation punch and a locking punch. Four deforming blocks are uniformly distributed on the lower end surface of the deformation punch in a ring shape. A guide slope is arranged on each deforming block. The guide slopes on the deforming blocks are configured to force the side wall of the annular locking piece to synchronously generate a pre-dimple. Two opposite deforming blocks are used to generate a radially inward pre-dimple, and the other two opposite deforming blocks are used to generate a radially outward pre-dimple. Four locking blocks are uniformly distributed on the lower end surface of the locking punch in a ring shape. A guide slope is also arranged on each locking block. The guide slopes on the locking blocks are configured to force the pre-dimple to deform to form a locking dimple. Two opposite locking blocks are used to shape the radially inward pre-dimple, and the other two opposite locking blocks are used to shape the radially outward pre-dimple.

Description

Technical Field

[0001] This invention relates to the field of aero-engine assembly technology, specifically to a locking tool and method for annular locking plates in a fairing assembly. Background Technology

[0002] The fairing assembly is a crucial component of the imported diffuser assembly, and its assembly quality directly impacts the overall performance and reliability of the engine. During the assembly of the fairing assembly, the installation of the top annular locking plate has consistently presented a technical challenge. The annular locking plate itself is a thin-walled annular component, requiring tools to apply force during installation to deform its sidewalls. Specifically, two points on the sidewall of the annular locking plate need to be radially outwardly recessed and engaged in the corresponding inclined grooves on the fairing housing, while two points on the sidewall of the annular locking plate also need to be radially inwardly recessed and engaged in the corresponding grooves on the central nut. The line connecting the two outward recesses forms a 90° angle with the line connecting the two inward recesses, as detailed below. Figure 1 and Figure 2 As shown, the above locking method requires the annular locking plate to deform simultaneously in multiple directions.

[0003] Currently, the assembly methods used in the industry mainly include using pliers to apply force to the ring-shaped locking plate to deform it radially inward, and using a general-purpose punch and hammer to deform it radially outward. Although these methods are relatively simple to operate, they have the following obvious shortcomings:

[0004] (1) Misalignment of the force application point or uneven force distribution can easily lead to cracking or scrapping of the lock plate.

[0005] (2) If each depression is deformed into place in one go, the amount of deformation is large and it is easy to rebound.

[0006] (3) Inward indentation is operated with pliers, while outward indentation is operated with a punch and a hammer. The operation is cumbersome, inefficient, and requires high skill from the operator. Summary of the Invention

[0007] The main objective of this invention is to provide a locking tool and method for annular locking plates in fairing assemblies, aiming to solve the aforementioned technical problems.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] On one hand, the present invention provides a locking tool for an annular locking piece in a fairing assembly, the core of which is that it includes a deformation punch and a locking punch.

[0010] The lower end face of the deformation punch has four deformation blocks evenly distributed in a ring. Each deformation block is provided with a guide slope. The guide slope on the deformation block is configured to force the side wall of the annular locking piece to generate a pre-dent simultaneously. Two opposing deformation blocks are used to generate a radially inward pre-dent, and the other two opposing deformation blocks are used to generate a radially outward pre-dent.

[0011] The lower end face of the locking punch has four locking blocks evenly distributed in a ring. Each locking block is also provided with a guide slope. The guide slope on the locking block is configured to force the pre-dent to deform to form a locking recess. Two opposing locking blocks are used to form the radially inward pre-dent and the other two opposing locking blocks are used to form the radially outward pre-dent.

[0012] Preferably, the four deformable punches on the lower end face of the deformable punch are, in sequence, a first deformable punch, a second deformable punch, a third deformable punch, and a fourth deformable punch; along the vertically downward direction, the distance between the guide slopes of the first and third deformable punches gradually increases; the distance between the guide slopes of the second and fourth deformable punches gradually decreases; and the included angle between the guide slopes of the first and third deformable punches and the included angle between the guide slopes of the second and fourth deformable punches are both α; the guide slopes of the first and third deformable punches force the sidewall of the annular locking piece to produce a radially inward pre-concave; the guide slopes of the second and fourth deformable punches force the sidewall of the annular locking piece to produce a radially outward pre-concave;

[0013] The four locking punches on the lower end face of the locking punch are, in sequence, a first locking punch, a second locking punch, a third locking punch, and a fourth locking punch. Along the vertically downward direction, the distance between the guide slopes of the first and third locking punches gradually increases; the distance between the guide slopes of the second and fourth locking punches gradually decreases; and the included angles between the guide slopes of the first and third locking punches and between the guide slopes of the second and fourth locking punches are both β. The guide slopes of the first and third locking punches are used to form radially inward pre-concave depressions; the guide slopes of the second and fourth locking punches are used to form radially outward pre-concave depressions.

[0014] Preferably, the included angles α and β satisfy: 1.7α ≤ β ≤ 1.8α. This specific angular relationship design ensures that after the deformation punch performs initial deformation to reduce springback, the locking punch can perform final forming at a larger angle, thereby efficiently and reliably achieving the required deformation.

[0015] Preferably, α and β satisfy: β = 1.75α.

[0016] Furthermore, the included angle α = 40°, and the included angle β = 70°.

[0017] Preferably, the cross-section of the guide slope is a circular arc surface with radius R, R=1.4mm, and the surface roughness of the guide slope is Ra=0.8.

[0018] Preferably, in the deformation punch, if the bisecting surfaces of the two sides of the second or fourth deformation punch are used as reference surface A, then the symmetry of the guide slopes of the first and third deformation punches relative to reference surface A is 0.05; if the bisecting surfaces of the two sides of the first or third deformation punch are used as reference surface B, then the symmetry of the guide slopes of the second and fourth deformation punches relative to reference surface B is 0.05.

[0019] Preferably, in the locking punch, the bisecting planes of the two sides of the second or fourth locking punch are used as reference plane C, then the symmetry of the guide slopes of the first and third locking punches relative to reference plane C is 0.05; the bisecting planes of the two sides of the first or third locking punch are used as reference plane D, then the symmetry of the guide slopes of the second and fourth locking punches relative to reference plane D is 0.05.

[0020] Secondly, the present invention also provides a locking method for an annular locking piece in a fairing assembly, using the aforementioned locking tool, comprising the following steps:

[0021] Step 1: Assemble the annular locking plate, the center nut, and the fairing housing, ensuring that the groove on the center nut and the inclined groove on the fairing housing are aligned at the predetermined positions.

[0022] Step 2: Using a deformation punch, align the deformation blocks on its lower end face with the corresponding side wall areas of the annular locking piece and apply vertical downward pressure to simultaneously form radially inward and radially outward pre-concavities on the side wall of the annular locking piece.

[0023] Step 3: Using the locking punch, align the locking blocks on its lower end face with the pre-dimples formed in Step 2, and apply vertical downward pressure again to further deform the pre-dimples into locking depressions, thus completing the locking.

[0024] Preferably, in steps two and three, the direction of the applied pressure is always kept parallel to the axis of the annular locking plate; in step two, the two radially inward pre-dimples and the two radially outward pre-dimples formed are alternately distributed in a cross shape on the circumference of the annular locking plate.

[0025] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0026] (1) Synchronous forming and uniform stress distribution: By distributing four deformation punches in a ring on the lower end face of the deformation punch and four locking punches in a ring on the lower end face of the locking punch, the four deformation areas of the ring locking plate can be simultaneously subjected to force when the ring locking plate is locked, ensuring the uniformity of stress distribution and fundamentally avoiding the problem of cracking of the locking plate due to uneven stress distribution.

[0027] (2) Two-step forming to suppress springback: A deformation punch (small angle α) is used for pre-forming to induce preliminary plastic deformation of the material and effectively release some internal stress; then a locking punch (large angle β) is used for final forming. This step-by-step, progressive deformation strategy significantly reduces the springback effect of the material and ensures the stability of the final deformation.

[0028] (3) Precise control and reliable quality: The guide slope adopts a circular arc surface with a specific radius and controls the surface roughness, which reduces the frictional resistance during the stamping process and makes the deformation process smoother. Strict symmetry requirements ensure the accuracy of forming and make the quality of each locking operation highly consistent.

[0029] (4) Safe operation and protective coating: The entire locking process only requires applying vertical downward pressure to the punch. There is no risk of relative sliding or scratching between the tool and the non-target contact area of ​​the fairing coating, which completely eliminates coating damage caused by improper operation.

[0030] (5) High efficiency and convenience, one-time success: Compared with the tedious process of traditional manual point-by-point tapping, the present invention can complete the locking of all four points through two stampings. The operation is simple and quick, the skill requirements of workers are reduced, and the assembly efficiency is greatly improved. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure when the annular locking plate is not locked.

[0033] Figure 2 This is a schematic diagram of the structure after the annular locking plate is locked.

[0034] Figure 3 This is a three-dimensional structural diagram of the deformation punch;

[0035] Figure 4 This is the front view of the deformable punch;

[0036] Figure 5 for Figure 4 Enlarged view at point M;

[0037] Figure 6 This is a right view of the deformation punch;

[0038] Figure 7 for Figure 6 Enlarged view at point N;

[0039] Figure 8 A three-dimensional structural diagram of the locking punch;

[0040] Figure 9 This is the front view of the locking punch;

[0041] Figure 10 for Figure 9 Enlarged view of point P in the middle;

[0042] Figure 11 Right view of the locking punch;

[0043] Figure 12 for Figure 11 A magnified view of point Q in the middle.

[0044] Explanation of reference numerals: 100-Center nut, 101-Groove; 200-Annular locking plate; 300-Fairing housing, 301-Sloping groove; 1-Deformation punch, 1a-First deformation punch, 1b-Second deformation punch, 1c-Third deformation punch, 1d-Fourth deformation punch; 2-Locking punch, 2a-First locking punch, 2b-Second locking punch, 2c-Third locking punch, 2d-Fourth locking punch. Detailed Implementation

[0045] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0047] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0048] As shown in the accompanying drawings, this embodiment provides a locking tool for an annular locking piece in a fairing assembly, the core of which includes a deformation punch 1 and a locking punch 2.

[0049] Combination Figures 3 to 7 As shown, four deformable punches are evenly distributed in a ring on the lower end face of the deformable punch 1. Each deformable punch has a guide slope. The guide slope on the deformable punch is configured to force the sidewall of the annular locking piece 200 to generate a pre-dent simultaneously. Two opposing deformable punches are used to generate a radially inward pre-dent, and the other two opposing deformable punches are used to generate a radially outward pre-dent.

[0050] Specifically, the four deformable punches on the lower end face of the deformable punch 1 are, in order, the first deformable punch 1a, the second deformable punch 1b, the third deformable punch 1c, and the fourth deformable punch 1d.

[0051] Along the vertically downward direction, the distance between the guide slopes of the first deforming punch 1a and the third deforming punch 1c gradually increases; the guide slopes on the first deforming punch 1a and the third deforming punch 1c act radially inward, which is used to force the sidewall of the annular locking piece 200 to produce a radially inward pre-concavity, that is, to press the sidewall of the annular locking piece 200 into the corresponding groove 101 on the central nut 100.

[0052] Along the vertically downward direction, the distance between the guide slopes of the second deformable punch 1b and the fourth deformable punch 1d decreases; the guide slopes on the second deformable punch 1b and the fourth deformable punch 1d act radially outward, forcing the sidewall of the annular locking piece 200 to produce a radially outward pre-concavity, that is, for pressing the sidewall of the annular locking piece 200 into the corresponding inclined groove 301 on the fairing housing 300.

[0053] Combination Figure 5 and Figure 7 As shown, the angle between the guide slopes of the first deformable punch 1a and the third deformable punch 1c, and the angle between the guide slopes of the second deformable punch 1b and the fourth deformable punch 1d are both α.

[0054] Combination Figures 8 to 12 As shown, four locking punches are evenly distributed in a ring on the lower end face of the locking punch 2. Each locking punch is also provided with a guide slope. The guide slope on the locking punch is configured to force the pre-dent to deform to form a locking recess. Two opposing locking punches are used to form the radially inward pre-dent, and the other two opposing locking punches are used to form the radially outward pre-dent.

[0055] Specifically, the four locking blocks on the lower end face of the locking punch 2 are, in order, the first locking block 2a, the second locking block 2b, the third locking block 2c and the fourth locking block 2d, and the layout of the four locking blocks corresponds to the four deforming blocks on the deforming punch 1.

[0056] Along the vertically downward direction, the distance between the guide slopes of the first locking punch 2a and the third locking punch 2c gradually increases; the guide slopes on the first locking punch 2a and the third locking punch 2c act radially inward, and are used to form the radially inward pre-concave.

[0057] Along the vertically downward direction, the distance between the guide slopes of the second locking punch 2b and the fourth locking punch 2d decreases; the guide slopes on the second locking punch 2b and the fourth locking punch 2d act radially outward, and are used to form the radially outward pre-dent.

[0058] Combination Figure 10 and Figure 12 As shown, the angle between the guide slopes of the first locking punch 2a and the third locking punch 2c, and the angle between the guide slopes of the second locking punch 2b and the fourth locking punch 2d are both β.

[0059] In this embodiment, the included angles α and β satisfy: 1.7α ≤ β ≤ 1.8α. Specifically, β = 1.75α. Further, the included angle α = 40°, and the included angle β = 70°.

[0060] In this embodiment, the cross-section of the guide slope is an arc surface with radius R, R=1.4mm, and the surface roughness of the guide slope is Ra=0.8.

[0061] Combination Figure 5 As shown, in the deformable punch 1, with the bisecting surfaces of the two sides of the second deformable punch 1b or the fourth deformable punch 1d as reference surface A, the symmetry of the guide slopes of the first deformable punch 1a and the third deformable punch 1c with respect to reference surface A is 0.05. Further, combined with... Figure 7As shown, taking the bisecting planes of the two sides of the first deformable punch 1a or the third deformable punch 1c as the reference plane B, the symmetry of the guide slopes of the second deformable punch 1b and the fourth deformable punch 1d with respect to the reference plane B is 0.05.

[0062] Combination Figure 10 As shown, in the locking punch 2, taking the bisecting planes of the two sides of the second locking punch 2b or the fourth locking punch 2d as the reference plane C, the symmetry of the guide slopes of the first locking punch 2a and the third locking punch 2c with respect to the reference plane C is 0.05. Further, combined with... Figure 12 As shown, taking the bisecting planes of the two sides of the first locking punch 2a or the third locking punch 2c as the reference plane D, the symmetry of the guide slopes of the second locking punch 2b and the fourth locking punch 2d with respect to the reference plane D is 0.05.

[0063] Secondly, this embodiment provides a locking method for an annular locking piece in a fairing assembly, using the aforementioned locking tool, and includes the following steps:

[0064] Step 1: Assemble the components to be locked: Place the annular locking plate 200 onto the central nut 100 and install the assembly at the designated position on the fairing housing 300. Adjust the central nut 100 so that its four evenly distributed grooves 101 are precisely aligned with any four of the twelve evenly distributed oblique grooves 301 on the fairing housing 300 (in a cross shape). In this embodiment, the width of the grooves 101 on the central nut 100 is 4.5 mm, and the width of the oblique grooves 301 on the fairing housing 300 is 4.3 mm.

[0065] Step 2, Preliminary Deformation (Pre-dent): The deformation punch 1 is lowered vertically, with its four deformation blocks 1a, 1b, 1c, and 1d on its lower end face aligned with the four areas on the annular locking plate 200 where deformation is about to occur. A stable, vertically downward pressure is applied to the deformation punch 1 using a pressure device. Under the action of the guide ramp, the sidewall of the annular locking plate 200 simultaneously begins to undergo plastic deformation, forming a preliminary pre-dent that has not yet reached its final depth. Specifically, the first deformation block 1a and the third deformation block 1c press the sidewall of the annular locking plate 200 into the corresponding groove 101 on the central nut 100, forming a radially inward pre-dent; while the second deformation block 1b and the fourth deformation block 1d press the sidewall of the annular locking plate 200 into the corresponding inclined groove 301 on the fairing housing 300, forming a radially outward pre-dent.

[0066] Step 3, Final Locking: Remove the deformation punch 1 and lower the locking punch 2 vertically, aligning its four locking blocks 2a, 2b, 2c, and 2d with the four pre-recesses formed in step S2. Apply downward pressure to the locking punch 2 again using a pressure device. Because the guide ramp angle β of the locking punch 2 is larger, it can force the pre-recesses to deform further with greater force until the material of the annular locking piece 200 is completely and reliably embedded in the groove 101 of the central nut and the inclined groove 301 of the fairing housing, achieving the final locking deformation required by the design, forming a robust cross-shaped locking structure, such as... Figure 2 As shown. Specifically, the guide slopes on the first locking punch 2a and the third locking punch 2c act radially inward, and are used to form the radially inward pre-recess. The guide slopes on the second locking punch 2b and the fourth locking punch 2d act radially outward, and are used to form the radially outward pre-recess.

[0067] In steps two and three, the direction of the applied pressure is always kept parallel to the axis of the annular locking plate 200.

[0068] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A locking tool for an annular locking piece in a fairing assembly, characterized in that, Includes a deformation punch (1) and a locking punch (2); The lower end face of the deformation punch (1) is evenly distributed with four deformation punches in a ring. Each deformation punch is provided with a guide slope. The guide slope on the deformation punch is configured to force the side wall of the annular locking piece (200) to generate a pre-dent. Two opposing deformation punches are used to generate a radially inward pre-dent, and the other two opposing deformation punches are used to generate a radially outward pre-dent. The lower end face of the locking punch (2) is evenly distributed with four locking punch blocks in a ring. Each locking punch block is also provided with a guide slope. The guide slope on the locking punch block is configured to force the pre-dent to deform in order to form a locking depression. Two opposing locking punch blocks are used to form the radially inward pre-dent and the other two opposing locking punch blocks are used to form the radially outward pre-dent. The four deformable punches on the lower end face of the deformable punch (1) are, in order, the first deformable punch (1a), the second deformable punch (1b), the third deformable punch (1c), and the fourth deformable punch (1d). Along the vertically downward direction, the distance between the guide slopes of the first deformable punch (1a) and the third deformable punch (1c) gradually increases; the distance between the guide slopes of the second deformable punch (1b) and the fourth deformable punch (1d) gradually decreases; and the included angle between the guide slopes of the first deformable punch (1a) and the third deformable punch (1c), and the included angle between the guide slopes of the second deformable punch (1b) and the fourth deformable punch (1d) are both α; the guide slopes of the first deformable punch (1a) and the third deformable punch (1c) force the sidewall of the annular locking piece (200) to produce a radially inward pre-concave shape; The guide ramps of the second deformable punch (1b) and the fourth deformable punch (1d) force the sidewall of the annular locking piece (200) to produce a radially outward pre-concavity; The four locking punches on the lower end face of the locking punch (2) are, in order, the first locking punch (2a), the second locking punch (2b), the third locking punch (2c) and the fourth locking punch (2d). Along the vertically downward direction, the distance between the guide slopes of the first locking punch (2a) and the third locking punch (2c) gradually increases; the distance between the guide slopes of the second locking punch (2b) and the fourth locking punch (2d) gradually decreases; and the included angle between the guide slopes of the first locking punch (2a) and the third locking punch (2c), and the included angle between the guide slopes of the second locking punch (2b) and the fourth locking punch (2d) are both β; the guide slopes of the first locking punch (2a) and the third locking punch (2c) are used to form the radially inward pre-concave; the guide slopes of the second locking punch (2b) and the fourth locking punch (2d) are used to form the radially outward pre-concave; The included angles α and β satisfy: 1.7α≤β≤1.8α.

2. The locking tool according to claim 1, characterized in that, The α and β satisfy: β = 1.75α.

3. The locking tool according to claim 1, characterized in that, The included angle α = 40°, and the included angle β = 70°.

4. The locking tool according to claim 1, characterized in that, The cross-section of the guide slope is a circular arc surface with radius R, R=1.4mm, and the surface roughness of the guide slope is Ra=0.

8.

5. The locking tool according to claim 1, characterized in that, Using the bisecting planes of the two sides of the second deformable punch (1b) or the fourth deformable punch (1d) as reference plane A, the symmetry of the guide slopes of the first deformable punch (1a) and the third deformable punch (1c) relative to reference plane A is 0.

05. Using the bisecting surfaces of the two sides of the first deformable punch (1a) or the third deformable punch (1c) as reference surface B, the symmetry of the guide slopes of the second deformable punch (1b) and the fourth deformable punch (1d) relative to reference surface B is 0.

05.

6. The locking tool according to claim 1, characterized in that, Using the bisecting planes of the two sides of the second locking punch (2b) or the fourth locking punch (2d) as the reference plane C, the symmetry of the guide slopes of the first locking punch (2a) and the third locking punch (2c) relative to the reference plane C is 0.

05. Using the bisecting planes of the two sides of the first locking punch (2a) or the third locking punch (2c) as the reference plane D, the symmetry of the guide slopes of the second locking punch (2b) and the fourth locking punch (2d) relative to the reference plane D is 0.

05.

7. A locking method for an annular locking piece in a fairing assembly, characterized in that, The locking tool according to any one of claims 1 to 6 comprises the following steps: Step 1: Assemble the annular locking plate (200), the center nut (100) and the fairing housing (300), and ensure that the groove (101) on the center nut (100) and the inclined groove (301) on the fairing housing (300) are aligned at the predetermined position; Step 2: Using the deformation punch (1), align the deformation blocks on its lower end face with the corresponding side wall areas of the annular locking piece (200) and apply vertical downward pressure to make the side wall of the annular locking piece (200) simultaneously form radial inward and radial outward pre-concavities. Step 3: Using the locking punch (2), align the locking blocks on its lower end face with the pre-dimples formed in Step 2, and apply vertical downward pressure again to further deform the pre-dimples to form locking depressions, thus completing the locking.

8. The locking method as described in claim 7, characterized in that, In steps two and three, the direction of the applied pressure is always kept parallel to the axis of the annular locking plate (200); In step two, the two radially inward pre-dimples and the two radially outward pre-dimples formed are arranged in a cross shape on the circumference of the annular locking piece (200).

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