Clamp and clamping method for fan-shaped section of blade ring

Abstract

The invention relates to the technical field of aero-engine manufacturing, in particular to a blade ring fan-shaped section clamp and a clamping method. The clamp comprises a bottom plate and a pressing plate assembly arranged on the bottom plate, an outer edge positioning block and an inner edge positioning block are installed on the bottom plate and provided with bottom faces used for supporting an outer edge plate and an inner edge plate of the blade ring fan-shaped section respectively, and the height difference between the two supporting faces is equal to the height difference between the inner edge plate and the outer edge plate of the blade ring fan-shaped section. The clamp is further provided with a circumferential limiting block and an alignment hole which are used for end face positioning and coordinate system establishment. The clamping method comprises the steps of fixing the clamp, placing the part, fitting the positioning surface, pressing the part and the like. Through the positioning design matched with the structural characteristics of parts, the clamping problem caused by the end face of the inclined plane and the height difference of the blade ring fan-shaped section is effectively solved, and the tool has the advantages of being high in positioning precision, good in anti-deformation effect, high in clamping efficiency and the like, and is particularly suitable for high-precision machining of the aero-engine blade ring fan-shaped section.

Description

Technical Field

[0001] This invention relates to the field of aero-engine manufacturing technology, and in particular to a clamp and clamping method for a fan-shaped section of a blade ring. Background Technology

[0002] The integral blade ring is a core and critical component of an aero-engine, used to fix and support the rotor blades. It is characterized by high precision and complex structure. The integral blade ring is composed of multiple blade ring sector segments spliced ​​together.

[0003] Combination Figure 1 As shown, the fan-shaped segment of the blade ring includes an inner edge plate 100 and an outer edge plate 101, and a plurality of blades 102 are arranged between the inner edge plate 100 and the outer edge plate 101.

[0004] In subsequent processing, the fan-shaped section of the impeller needs to be clamped using a fixture. However, the two end faces of the fan-shaped section are inclined, and there is a height difference between the end faces of the inner edge plate 100 and the outer edge plate 101 along the axial direction of the entire impeller. This makes clamping the fan-shaped section of the impeller difficult, and there is no locating surface for aligning and positioning the fan-shaped section.

[0005] Therefore, there is an urgent need to provide a clamp and clamping method for the fan-shaped segment of the blade ring in order to achieve rapid clamping and positioning. Summary of the Invention

[0006] The main objective of this invention is to provide a clamp and clamping method for the fan-shaped segment of the blade ring, in order to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention provides a clamp for a fan-shaped blade ring segment, comprising a base plate and a plurality of pressure plate assemblies disposed on the base plate; an outer edge positioning block and an inner edge positioning block are mounted on the top surface of the base plate; a first support surface is provided on the outer edge positioning block for supporting the bottom surface of the outer edge plate of the fan-shaped blade ring segment; a second support surface is provided on the inner edge positioning block for supporting the bottom surface of the inner edge plate of the fan-shaped blade ring segment; the height difference between the first support surface and the second support surface is equal to the height difference between the bottom surfaces of the outer edge plate and the inner edge plate; ensuring that the bottom surfaces of the inner and outer edge plates are completely in contact with the corresponding support surfaces when the fan-shaped blade ring segment is placed; the pressure plate assemblies are used to press against the top surfaces of the outer edge plate and the inner edge plate.

[0008] Preferably, a first arc-shaped protrusion is provided on the top of the outer edge positioning block; a second arc-shaped protrusion is provided on the top of the inner edge positioning block; the inner arc surface of the first arc-shaped protrusion is set as a first radial limiting surface for contact and limiting with the outer arc surface of the outer edge plate; the outer arc surface of the second arc-shaped protrusion is set as a second radial limiting surface for contact and limiting with the inner arc surface of the inner edge plate, thereby achieving radial positioning of the fan-shaped segment of the blade ring.

[0009] Preferably, a circumferential limiting block is provided on the bottom surface of the base plate. The circumferential limiting block is used to block and limit one end face of the blade ring sector segment. This serves to limit circumferential movement and prevent the blade ring sector segment from moving circumferentially during processing.

[0010] Preferably, the top surface and one of its long sides of the circumferential limiting block are set as alignment planes. When processing the fan-shaped segment of the blade ring, the alignment plane on the circumferential limiting block is used to facilitate the alignment of the processing coordinate system.

[0011] Furthermore, alignment holes are provided on the base plate to quickly and accurately establish the origin of the machining coordinate system during machining.

[0012] Preferably, the pressure plate assembly includes a pressure plate, a double-ended stud, a clamping nut, and a push rod; the lower end of the double-ended stud is screwed onto the base plate, and the upper end passes through the pressure plate and is screwed onto the clamping nut; one end of the pressure plate is a clamping end, and the other end is a supporting end; the upper end of the push rod is provided with an external thread and is screwed onto the supporting end of the pressure plate; the lower end of the push rod abuts against the base plate.

[0013] Preferably, a groove is provided on the top surface of the base plate, and the lower end of the push rod abuts against the groove to limit the movement and prevent the lower end of the push rod from sliding, thereby enhancing the clamping stability.

[0014] Preferably, the base plate is provided with two U-shaped grooves and multiple screw through holes. This facilitates fixing the fixture to the machine tool worktable.

[0015] Secondly, the present invention also proposes a clamping method for the fan-shaped segment of the blade ring, using the above-mentioned clamp, comprising the following steps: S1. Fix the fixture on the machine tool's worktable; S2. Place the blade ring sector segment to be processed on the fixture, so that the first support surface of the outer edge positioning block is supported on the bottom surface of the outer edge plate of the blade ring sector segment, and the second support surface of the inner edge positioning block is supported on the bottom surface of the inner edge plate of the blade ring sector segment. S3. Use the pressure plate assembly to press the outer edge plate and the inner edge plate onto their top surfaces respectively to complete the clamping operation.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: (1) Effectively solves the problem of clamping on inclined surfaces: By setting an outer edge positioning block and an inner edge positioning block with a height difference, the height difference between the bottom surfaces of the inner and outer edge plates of the blade ring fan-shaped section is perfectly matched, which solves the problem of clamping difficulties caused by the height difference between the bottom surfaces of the inner and outer edge plates of the blade ring fan-shaped section.

[0017] (2) Provide a reliable positioning reference: The radial limit is achieved by using the arc-shaped protrusion structure, and the end face positioning is provided by the circumferential limit block. This provides a complete and reliable positioning system for the fan-shaped section of the blade ring, overcoming the defect of the original structure lacking a positioning reference.

[0018] (3) Improve processing efficiency: By setting the alignment holes on the base plate and the alignment plane on the circumferential limit block, the processing coordinate system can be quickly established, which significantly improves the clamping and processing efficiency.

[0019] (4) Adaptable to complex structures: This invention is specifically designed for the special structures of the fan-shaped section of the blade ring (such as the inclined end face, the inner and outer edge plates with height difference), and has good relevance and practicality. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a schematic diagram of the structure of the fan-shaped segment of the blade ring; Figure 2 This is a schematic diagram showing the blade ring sector segment after being clamped using the clamp provided by the present invention; Figure 3 This is a cross-sectional view of the outer and inner positioning blocks.

[0022] Reference numerals: 1. Base plate; 1a. Alignment hole; 1b. Countersunk groove; 1c. U-shaped groove; 1d. Screw through hole; 2. Pressure plate assembly; 2a. Pressure plate; 2b. Double-ended stud; 2c. Compression nut; 2d. Top rod; 3. Circumferential limiting block; 4. Outer edge positioning block; 4a. First support surface; 4b. First arc-shaped protrusion; 4c. First radial limiting surface; 5. Inner edge positioning block; 5a. Second support surface; 5b. Second arc-shaped protrusion; 5c. Second radial limiting surface; 100. Inner edge plate; 101. Outer edge plate; 103. Blade. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Combination Figure 2 and Figure 3 As shown, this embodiment provides a clamp for a fan-shaped blade ring segment, including a base plate 1 and a plurality of pressure plate assemblies 2 disposed on the base plate 1; an outer edge positioning block 4 and an inner edge positioning block 5 are installed on the top surface of the base plate 1; a first support surface 4a is provided on the outer edge positioning block 4 for supporting the bottom surface of the outer edge plate 101 of the fan-shaped blade ring segment; a second support surface 5a is provided on the inner edge positioning block 5 for supporting the bottom surface of the inner edge plate 100 of the fan-shaped blade ring segment; the height difference H between the first support surface 4a and the second support surface 5a is equal to the height difference between the bottom surfaces of the outer edge plate 101 and the inner edge plate 100, ensuring that the fan-shaped blade ring segment fits stably when placed; the pressure plate assembly 2 is used to press against the top surfaces of the outer edge plate 101 and the inner edge plate 100.

[0027] Combination Figure 3 As shown, a first arc-shaped protrusion 4b is provided on the top of the outer edge positioning block 4; a second arc-shaped protrusion 5b is provided on the top of the inner edge positioning block 5; the inner arc surface of the first arc-shaped protrusion 4b is configured as a first radial limiting surface 4c, used for contact and limiting with the outer arc surface of the outer edge plate 101; the outer arc surface of the second arc-shaped protrusion 5b is configured as a second radial limiting surface 5c, used for contact and limiting with the inner arc surface of the inner edge plate 100. By adopting the above structure, radial limiting is achieved for the fan-shaped segment of the blade ring.

[0028] Combination Figure 2As shown, a circumferential limiting block 3 is provided on the bottom surface of the base plate 1. The circumferential limiting block 3 is used to block and limit one end face of the fan-shaped segment of the blade ring, thereby achieving circumferential limitation of the fan-shaped segment of the blade ring. The top surface and one long side surface of the circumferential limiting block 3 are set as alignment planes to facilitate the alignment of the coordinate system on the machine tool. Furthermore, an alignment hole 1a is provided on the base plate 1 to establish the origin of the machining coordinate system.

[0029] In this embodiment, the pressure plate assembly 2 includes a pressure plate 2a, a double-ended stud 2b, a clamping nut 2c, and a push rod 2d. The lower end of the double-ended stud 2b is screwed onto the base plate 1, and the upper end passes through the pressure plate 2a and is screwed onto the clamping nut 2c. One end of the pressure plate 2a is a clamping end, and the other end is a supporting end. The upper end of the push rod 2d is provided with an external thread and is screwed onto the supporting end of the pressure plate 2a. The lower end of the push rod 2d abuts against the base plate 1. Two pressure plate assemblies 2 are respectively configured on the inner edge plate 100 and the outer edge plate 101. Further, a recess 1b is provided on the top surface of the base plate 1, and the lower end of the push rod 2d abuts against the recess 1b.

[0030] Two U-shaped grooves 1c and multiple screw holes 1d are provided on the base plate 1 for fixing the fixture to the machine tool worktable.

[0031] Secondly, this embodiment provides a method for clamping a fan-shaped segment of a blade ring, using the aforementioned clamp, and includes the following steps: S1. Fix the fixture on the machine tool worktable. Specifically, fix the base plate 1 on the machine tool worktable through the U-shaped groove 1c or through the screw through hole 1d.

[0032] S2. Place the blade ring sector segment to be processed on the fixture, so that the first support surface 4a of the outer edge positioning block 4 is supported on the bottom surface of the outer edge plate 101 of the blade ring sector segment, and the second support surface 5a of the inner edge positioning block 5 is supported on the bottom surface of the inner edge plate 100 of the blade ring sector segment.

[0033] S3. The clamping operation is completed by pressing the pressure plate assembly 2 onto the top surfaces of the outer edge plate 101 and the inner edge plate 100 respectively.

[0034] Specifically, it includes the following stages: I. Fixture Installation Stage: First, fix the fixture to the machine tool worktable via the U-slot 1c or the screw through-hole 1d. Use the U-slot 1c to connect and fix it to the machine tool worktable with bolts. Alternatively, use screws passing through the screw through-hole 1d to fix the base plate 1 to the machine tool worktable.

[0035] II. Part positioning stage: When placing the fan-shaped segment of the blade ring on the fixture, it is necessary to ensure that the bottom surface of the outer edge plate 101 is completely in contact with the first support surface 4a, and the bottom surface of the inner edge plate 100 is completely in contact with the second support surface 5a.

[0036] The precise height difference H between the first support surface 4a and the second support surface 5a is designed to perfectly match the height difference between the bottom surfaces of the inner and outer edge plates of the fan-shaped section of the blade ring, eliminating the assembly stress caused by the height mismatch.

[0037] The first arc-shaped protrusion 4b on the outer edge positioning block 4 and the second arc-shaped protrusion 5b on the inner edge positioning block 5 form surface contact with the inner and outer arc surfaces of the part, respectively, providing excellent radial limiting effect.

[0038] The circumferential limiting block 3 fits tightly against the inclined end face of the fan-shaped segment of the blade ring, achieving precise circumferential positioning.

[0039] III. Compacting Operation Stage: When using pressure plate assembly 2 for clamping, the specific operating steps and their effects are as follows: 1. Screw the lower end of the double-ended stud 2b into the threaded hole of the base plate 1, ensuring perpendicularity.

[0040] 2. Screw the push rod 2d onto the support end of the pressure plate 2a, and adjust the screwing amount of the push rod 2d so that the pressure plate 2a is in a horizontal state when it contacts the inner edge plate 100 and the outer edge plate 101, and then put the pressure plate 2a onto the double-ended stud 2b.

[0041] 3. When tightening the clamping nut 2c, the lower end of the push rod 2d abuts against the recess 1b, forming a stable lever clamping mechanism. The design of the recess 1b ensures stable support for the push rod 2d and prevents significant slippage of the lower end of the push rod 2d.

[0042] IV. Coordinate System Establishment Stage: Establish a machining coordinate system using the alignment plane of alignment hole 1a and circumferential limit block 3: The alignment hole 1a provides a precise coordinate origin reference, and the alignment plane of the circumferential limit block 3 provides a reliable reference for the direction reference of the coordinate system. This dual reference design ensures the rapid establishment and precise positioning of the machining coordinate system.

[0043] 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 clamp for a fan-shaped segment of a leaf ring, characterized in that, It includes a base plate (1) and a plurality of pressure plate assemblies (2) disposed on the base plate (1); An outer edge positioning block (4) and an inner edge positioning block (5) are installed on the top surface of the base plate (1); A first support surface (4a) is provided on the outer edge positioning block (4) for supporting the bottom surface of the outer edge plate (101) of the blade ring sector section; A second support surface (5a) is provided on the inner edge positioning block (5) for supporting the bottom surface of the inner edge plate (100) of the blade ring sector segment; The height difference between the first support surface (4a) and the second support surface (5a) is equal to the height difference between the bottom surfaces of the outer edge plate (101) and the inner edge plate (100); The pressure plate assembly (2) is used to press against the top surfaces of the outer edge plate (101) and the inner edge plate (100).

2. The clamp according to claim 1, characterized in that, A first arc-shaped protrusion (4b) is provided on the top of the outer edge positioning block (4); a second arc-shaped protrusion (5b) is provided on the top of the inner edge positioning block (5). The inner arc surface of the first arc protrusion (4b) is set as the first radial limiting surface (4c) for contact and limiting with the outer arc surface of the outer edge plate (101); The outer arc surface of the second arc protrusion (5b) is set as the second radial limiting surface (5c) for contact and limiting with the inner arc surface of the inner edge plate (100).

3. The clamp according to claim 1, characterized in that, A circumferential limiting block (3) is provided on the bottom surface of the base plate (1). The circumferential limiting block (3) is used to block and limit one end face of the fan-shaped section of the blade ring.

4. The clamp according to claim 3, characterized in that, The top surface and one of its long side surfaces of the circumferential limiting block (3) are set as the alignment plane.

5. The clamp according to claim 1, characterized in that, Alignment holes (1a) are provided on the base plate (1).

6. The clamp according to claim 1, characterized in that, The pressure plate assembly (2) includes a pressure plate (2a), a double-ended stud (2b), a clamping nut (2c), and a push rod (2d); The lower end of the double-ended stud (2b) is screwed onto the base plate (1), and the upper end passes through the pressure plate (2a) and is screwed onto a clamping nut (2c). One end of the pressure plate (2a) is a pressing end and the other end is a supporting end. The upper end of the top rod (2d) is provided with an external thread and screwed onto the supporting end of the pressure plate (2a). The lower end of the top rod (2d) abuts against the base plate (1).

7. The clamp according to claim 6, characterized in that, A sinkhole (1b) is provided on the top surface of the base plate (1), and the lower end of the top rod (2d) abuts against the sinkhole (1b).

8. The clamp according to claim 1, characterized in that, Two U-shaped grooves (1c) are provided on the base plate (1).

9. The clamp according to claim 1, characterized in that, Multiple screw holes (1d) are provided on the base plate (1).

10. A method for clamping a fan-shaped segment of a leaf ring, characterized in that, The clamp according to any one of claims 1 to 9 comprises the following steps: S1. Fix the fixture on the machine tool's worktable; S2. Place the blade ring sector segment to be processed on the fixture, so that the first support surface (4a) of the outer edge positioning block (4) is supported on the bottom surface of the outer edge plate (101) of the blade ring sector segment, and the second support surface (5a) of the inner edge positioning block (5) is supported on the bottom surface of the inner edge plate (100) of the blade ring sector segment. S3. By using the pressure plate assembly (2) to press the outer edge plate (101) and inner edge plate (100) on their top surfaces respectively, the clamping operation can be completed.

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