Coated high-pressure turbine outer ring block clamping structure and processing method

Abstract

This invention relates to the field of high-pressure turbine manufacturing technology, and in particular to a clamping structure and processing method for a coated high-pressure turbine outer ring block. The structure includes a base, which is configured as an annular base with its inner annular surface acting as a positioning surface, fitting against the outer wall of the outer ring block to be clamped. This achieves positioning of the outer ring block. The annular groove at the top of the base and a fastening device further facilitate the positioning and clamping of the outer ring block unit parts. After clamping, the unit parts are assembled into a complete annular component. During clamping, stress on the coating surface is avoided, thus protecting the coating of the outer ring block and preventing cracking or peeling. This method ensures the integrity of the coating during processing while simultaneously enabling grinding of the entire annular component. It avoids the problem of excessive runout values ​​affecting the overall machine performance caused by disassembling and reassembling individual sub-unit parts. The process offers high quality and efficiency, meeting the high-precision grinding requirements for large-volume outer ring block grinding.

Description

Technical Field

[0001] This invention relates to the field of high-pressure turbine manufacturing technology, specifically to a coated high-pressure turbine outer ring block clamping structure and processing method. Background Technology

[0002] The high-pressure turbine casing assembly is mounted at the rear end of the main combustion chamber unit, and its main function is to work in conjunction with the high-pressure turbine rotor. In the assembly of the high-pressure turbine unit in an aero-engine, the runout value of the outer ring is closely related to the interstage clearance of the high-pressure turbine casing assembly, directly affecting turbine efficiency. Therefore, high runout tolerance accuracy of the outer ring is required. This necessitates achieving precision control by grinding the outer ring block or the wear-resistant coating on its surface while it is in the assembled state.

[0003] The new high-pressure turbine outer ring block features a plasma-sprayed coating (Ni, Cr, Al, and Y, etc.) on its inner surface. The coated outer ring block exhibits high surface hardness and brittleness. A single high-pressure turbine outer ring block is composed of several high-pressure turbine outer rings of varying numbers. Compared to traditional high-pressure turbine outer ring blocks, the new high-pressure turbine outer ring block, due to its surface coating, is prone to detachment or cracking during clamping, making clamping more difficult. Currently, grinding the outer ring of the high-pressure turbine casing assembly requires disassembling each component, machining them individually, and then reassembling them for use. Because the outer ring is assembled from several sub-unit parts, the runout value of the entire ring is prone to exceeding tolerances after reassembly, leading to excessive interstage clearances, affecting overall machine performance. Furthermore, the entire disassembly and assembly process is time-consuming and inefficient. Summary of the Invention

[0004] To address the problems in existing technologies where the coating on coated high-pressure turbine outer ring blocks is prone to peeling and cracking during processing, resulting in high processing difficulty, poor product quality, and low efficiency, this invention provides a clamping structure and processing method for coated high-pressure turbine outer ring blocks.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] This invention provides a clamping structure for a coated high-pressure turbine outer ring block, including a base, which is an annular base. The inner annular surface of the base is a positioning surface that fits against the outer wall of the outer ring block to be clamped. An annular groove is formed on the upper end surface of the base along the circumference. Several fastening devices are provided on the top of the base, and the fastening devices are arranged in an array along the circumference of the base outside the annular groove.

[0007] Furthermore, the fastening device includes a pressure plate connected to the top of the base and an adjusting support disposed between the top of the base and the pressure plate; one end of the pressure plate extends across the annular groove to the inner ring edge of the base, and the bottom of the other end of the pressure plate is pressed against the adjusting support.

[0008] Preferably, the width of the pressure plate extending across the annular groove to the inner ring edge of the base is greater than the width of the other end of the pressure plate.

[0009] Preferably, the pressure plate is connected to the base via an equal-length double-ended stud; one end of the equal-length double-ended stud is threaded to the base, and the other end of the equal-length double-ended stud passes through the pressure plate and is fixed by a nut.

[0010] Preferably, a spring is fitted onto the double-ended stud of equal length between the pressure plate and the top of the base.

[0011] Preferably, the pressure plate has elongated mounting holes, and the number of pressure plates is greater than or equal to the number of outer ring blocks.

[0012] Preferably, the inner wall of the base is provided with an annular support groove along the circumference, and when the outer ring block is clamped, the bottom surface of the annular support groove contacts the bottom surface of the outer ring block.

[0013] Preferably, the top of the base is provided with a plurality of lifting rings, and the lifting rings are provided with lifting ring bushings.

[0014] The present invention also provides a processing method utilizing the above-described clamping structure, comprising:

[0015] The groove at the upper end of the outer ring block is connected to the annular groove in sequence, so that the outer wall surface of the outer ring block is fitted and positioned with the positioning surface, thus completing the assembly of the entire outer ring block;

[0016] The upper surface of the positioned outer ring block is pressed in sequence to complete the clamping of the entire outer ring block;

[0017] The outer ring block of the entire ring is aligned after clamping, and the coated surface of the outer ring block is ground.

[0018] Furthermore, the method for aligning the clamped outer ring block and grinding the coated surface of the outer ring block is as follows:

[0019] Align the upper end face of the clamped outer ring block to ensure that the runout value is ≤0.1mm;

[0020] For the coated surface of the inner ring that needs grinding after clamping the outer ring block, the runout value should be ≤0.1mm;

[0021] After aligning the upper end face of the clamped outer ring block and the coating surface of the inner ring, the coating surface is ground from top to bottom. The runout difference of the coating surface is monitored during the grinding process to eliminate the taper and ensure that the inner ring size and runout of the outer ring block meet the requirements, thus completing the grinding process of the coating surface of the outer ring block.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] A clamping structure for a coated high-pressure turbine outer ring block includes a base. The base is configured as an annular base, with its inner annular surface acting as a positioning surface, fitting against the outer wall of the outer ring block to be clamped. This achieves positioning of the outer ring block. The annular groove at the top of the base and a fastening device further facilitate the positioning and clamping of the outer ring block unit parts. After clamping, the unit parts are assembled into a complete annular component. During clamping, stress on the coating surface is avoided, thus protecting the coating of the outer ring block and preventing cracking or peeling. This structure ensures the integrity of the coating during processing while simultaneously enabling grinding of the entire annular component. It avoids the problem of excessive runout values ​​affecting overall machine performance caused by disassembling and reassembling individual sub-unit parts. The structure offers high processing quality and efficiency, meeting the high-precision grinding requirements for large-volume outer ring block grinding.

[0024] By connecting a pressure plate to the top of the base and setting an adjusting support between the top of the base and the pressure plate, the adjusting support cooperates with the pressure plate to clamp the outer ring block and effectively avoid the coating surface, further preventing the coating surface from peeling off or cracking under stress.

[0025] The width of the pressure plate extending across the annular groove to the inner ring edge of the base is greater than the width of the other end of the pressure plate, so as to ensure effective clamping of the top of the outer ring block.

[0026] The pressure plate is connected to the base via equal-length double-ended studs; one end of the equal-length double-ended studs is threaded to the base, and the other end of the equal-length double-ended studs passes through the pressure plate and is fixed by a nut, which facilitates the adjustment and installation of the pressure plate.

[0027] A spring is fitted on the equal-length double-ended stud between the pressure plate and the top of the base to maintain the clamping force of the pressure plate during the process of pressing the outer ring block, and to adjust the clamping pressure of the equal-length double-ended stud to maintain the stability of the connector.

[0028] The pressure plate has elongated mounting holes, and the number of pressure plates is greater than or equal to the number of outer ring blocks, which can improve the versatility of clamping and ensure the effective clamping of the outer ring blocks of each sub-unit.

[0029] The inner wall of the base is provided with an annular support groove along the circumference. When the outer ring block is clamped, the bottom surface of the annular support groove contacts the bottom surface of the outer ring block, which can further provide support for the bottom of the outer ring block and maintain stability during the processing.

[0030] The base is provided with several lifting rings on its top, and the lifting rings are provided with lifting ring bushings to facilitate the movement of the entire clamping structure.

[0031] The present invention also provides a processing method using the above-mentioned clamping structure. The method involves sequentially connecting the groove at the upper end of the outer ring block with the annular groove, so that the outer wall surface of the outer ring block fits and is positioned against the positioning surface, and is pressed tightly to achieve effective clamping of the entire outer ring block. Then, by aligning the clamped entire outer ring block and grinding the coating surface of the entire outer ring block, the integrity of the coating during the processing is ensured while the grinding accuracy of the entire annular part is guaranteed. The method is simple, has high processing efficiency, and can realize batch processing of outer ring blocks. Attached Figure Description

[0032] Figure 1 The figures show a cross-sectional view and a partial structural schematic diagram of a coated high-pressure turbine outer ring block clamping structure according to the present invention. a is a cross-sectional view and b is a partial structural schematic diagram.

[0033] Figure 2 This is a structural diagram and cross-sectional view of a coated high-pressure turbine outer ring block according to the present invention. a is a schematic diagram of the structure and b is a cross-sectional view.

[0034] Figure 3 This is a schematic diagram of the clamping state of the outer ring block of a high-pressure turbine with coating according to the present invention.

[0035] Figure 4 This is a flowchart of the processing method for the coated high-pressure turbine outer ring block of the present invention.

[0036] Among them, 1-base, 2-fastening device, 3-outer ring block, 11-annular groove, 12-annular support groove, 13-lifting ring, 21-pressure plate, 22-adjusting support, 23-equal length double-ended stud, 24-long strip mounting hole, 25-screw-in threaded bushing, 26-thinning nut, 31-groove, 32-upper end face, 33-coated surface. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0044] See Figure 1 This invention provides a clamping structure for a coated high-pressure turbine outer ring block, including a base 1, which is an annular base. The inner annular surface of the base 1 is a positioning surface, which is in contact with the outer wall of the outer ring block to be clamped. An annular support groove 12 is provided on the positioning surface along the circumference. When clamping the outer ring block 3, the bottom surface of the annular support groove 12 contacts the bottom surface of the outer ring block 3. An annular groove 11 is provided on the upper surface of the base 1 along the circumference. A plurality of fastening devices 2 and a plurality of lifting rings 13 are provided on the top of the base 1. The fastening devices 2 are arranged in a circular array along the outer side of the annular groove 11 of the base 1. Lifting ring bushings are provided on the lifting rings 13.

[0045] The fastening device 2 includes a pressure plate 21 connected to the top of the base 1 and an adjusting support 22 disposed between the top of the base 1 and the pressure plate 21. The pressure plate 21 is connected to the base 1 by a double-ended stud 23 of equal length. One end of the double-ended stud 23 of equal length is threaded to the base 1 by a screw-in threaded bushing 25 and fixed by a thinning nut 26. The other end of the double-ended stud 23 of equal length passes through the pressure plate 21 and is fixed by a nut. A spring is fitted on the double-ended stud 23 of equal length. One end of the pressure plate 21 extends across the annular groove 11 to the inner ring edge of the base 1. The bottom of the other end of the pressure plate 21 is pressed against the adjusting support 22. Preferably, the width of the end of the pressure plate 21 extending across the annular groove 11 to the inner ring edge of the base 1 is greater than the width of the other end of the pressure plate 21. The pressure plate 21 has elongated mounting holes 24, and the number of pressure plates 21 is greater than or equal to the number of outer ring blocks.

[0046] Preferably, the base 1 is made of HT200 material by machining and drilling, and the pressure plate 21 is made of 45 steel wire by cutting and milling. It is wider at the front and narrower at the back, that is, the front end of the pressure plate 21 presses against the uncoated part of the upper surface 32 of the outer ring block 3.

[0047] See Figure 2 and Figure 3 In use, adjust the nut at the top of the pressure plate 21 so that the pressure plate 21 is lifted by the spring, and the groove 31 of the outer ring block 3 is connected to the annular groove 11 so that the outer end of the groove 31 is inserted into the annular groove 11 and fits together. The outer wall of the outer ring block 3 is also fitted with the inner ring surface of the base 1, i.e., the positioning surface, to complete the positioning of the outer ring block 3. The remaining outer ring blocks 3 are installed and positioned in the same way. After positioning, adjust the nut and the support 22 so that the front end of the pressure plate 21 presses against the uncoated part of the upper surface 32 of the outer ring block 3, thus completing the positioning and clamping of the outer ring block 3 of one sub-unit. In this way, the remaining outer ring blocks 3 are positioned and clamped in turn.

[0048] See Figure 4 The present invention provides a processing method utilizing the above-described clamping structure, comprising:

[0049] S1: Sequentially connect the groove 31 at the upper end of the outer ring block 3 with the annular groove 11, so that the outer wall surface of the outer ring block 3 fits and is positioned against the positioning surface, thus completing the assembly of the entire outer ring block. Specifically:

[0050] Adjust the nut at the top of the pressure plate 21 so that the pressure plate 21 is lifted by the spring, and the groove 31 of the outer ring block 3 is connected to the annular groove 11 so that the outer end of the groove 31 is inserted into the annular groove 11 and fits together. The outer wall of the outer ring block 3 is then fitted with the inner ring surface of the base 1, i.e., the positioning surface, to complete the positioning of the outer ring block 3. The remaining outer ring blocks 3 are installed and positioned in the same way to complete the assembly of the entire outer ring block.

[0051] S2: Press the upper end face 32 of the positioned outer ring block 3 in sequence to complete the clamping of the entire outer ring block 3, specifically as follows:

[0052] By sequentially adjusting the nuts and adjusting the support 22, the front end of the pressure plate 21 presses against the uncoated part of the upper surface 32 of the outer ring block 3 of each subunit, thus completing the clamping of the entire outer ring block 3.

[0053] S3: Align the clamped outer ring block 3 and grind the coated surface 33 of the outer ring block 3, specifically:

[0054] Align the upper end face of the clamped outer ring block 3 to ensure that the runout value is ≤0.1mm;

[0055] The coating surface 33 of the inner ring of the clamped outer ring block 3 that needs to be ground is made so that the runout value is ≤0.1mm;

[0056] After aligning the upper end face of the outer ring block 3 and the coating surface 33 of the inner ring after clamping, the coating surface 33 is ground from top to bottom, and the runout difference of the coating surface 33 is monitored during the grinding process to eliminate the taper, so that the inner ring size and runout of the outer ring block 3 meet the requirements, and the grinding of the coating surface 33 of the outer ring block 3 is completed.

[0057] It should be noted that when performing grinding, the need for adding coolant can be determined based on the amount of material removed during grinding. Generally, for coated outer ring blocks with small grinding allowances (within 0.5mm on each side), coolant is not required to avoid contamination of the coating. Grinding can be performed using CBN grinding wheels, proceeding from top to bottom. During grinding, pay attention to frequent wheel maintenance and monitor the vertical runout difference of the ground surface to ensure the elimination of taper and ultimately guarantee the required hole size and runout of the outer ring block.

[0058] In summary, this invention provides a clamping structure and processing method for a coated high-pressure turbine outer ring block. By setting the base as an annular base and making the inner annular surface of the base a positioning surface that fits against the outer wall of the outer ring block to be clamped, the outer ring block is positioned. The positioning and clamping of the outer ring block unit parts are achieved through the annular groove at the top of the base and the fastening device. After the unit parts are clamped, they are spliced ​​into an integral annular part. During the clamping process, the coating surface is avoided from being stressed, thereby protecting the coating of the outer ring block and preventing it from cracking or peeling off. It can achieve grinding of the integral annular part while ensuring the integrity of the coating during the processing. The processing quality is good and the efficiency is high, which can meet the high-precision processing of large batches of outer ring blocks.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the technical solution of the present invention in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A coated high-pressure turbine outer ring block clamping structure, characterized in that, Includes a base (1), which is an annular base. The inner annular surface of the base (1) is a positioning surface, which is in contact with the outer wall of the outer ring block to be clamped. The upper end surface of the base (1) is provided with an annular groove (11) along the circumferential direction. The top of the base (1) is provided with a number of fastening devices (2), which are arranged in a circular array along the outer side of the base (1) of the annular groove (11). The fastening device (2) includes a pressure plate (21) connected to the top of the base (1) and an adjusting support (22) disposed between the top of the base (1) and the pressure plate (21); one end of the pressure plate (21) extends across the annular groove (11) to the inner ring edge of the base (1), and the bottom of the other end of the pressure plate (21) is pressed against the adjusting support (22); the pressure plate (21) is connected to the base (1) by a double-ended stud (23); one end of the double-ended stud (23) is threaded to the base (1), and the other end of the double-ended stud (23) passes through the pressure plate (21) and is fixed by a nut; a spring is sleeved on the double-ended stud (23) between the pressure plate (21) and the top of the base (1); The inner wall of the base (1) is provided with an annular support groove (12) along the circumferential direction. When the outer ring block (3) is clamped, the bottom surface of the annular support groove (12) contacts the bottom surface of the outer ring block (3).

2. The coated high-pressure turbine outer ring block clamping structure according to claim 1, characterized in that, The width of one end of the pressure plate (21) extending across the annular groove (11) to the inner ring edge of the base (1) is greater than the width of the other end of the pressure plate (21).

3. The coated high-pressure turbine outer ring block clamping structure according to claim 1, characterized in that, The pressure plate (21) has elongated mounting holes (24), and the number of pressure plates (21) is greater than or equal to the number of outer ring blocks.

4. The coated high-pressure turbine outer ring block clamping structure according to claim 1 or 2, characterized in that, The base (1) is provided with a number of lifting rings (13) on its top, and the lifting rings (13) are provided with lifting ring bushings.

5. A processing method utilizing the clamping structure according to any one of claims 1-4, characterized in that, include: The groove (31) at the upper end of the outer ring block (3) is connected to the annular groove (11) in sequence, so that the outer wall surface of the outer ring block (3) is in contact with the positioning surface and the assembly of the entire outer ring block is completed. The upper end face (32) of the positioned outer ring block (3) is pressed in sequence to complete the clamping of the entire outer ring block (3); The outer ring block (3) of the whole ring is aligned after clamping, and the coating surface (33) of the outer ring block (3) is ground.

6. The processing method according to claim 5, characterized in that, The method for aligning the clamped outer ring block (3) and grinding the coated surface (33) of the outer ring block (3) is as follows: Align the upper end face of the clamped outer ring block (3) to ensure that the runout value is ≤0.1mm; For the inner ring coating surface (33) of the clamped outer ring block (3) that needs to be ground, the runout value is ≤0.1mm; After aligning the upper end face of the clamped outer ring block (3) and the coating surface (33) of the inner ring, the coating surface (33) is ground from top to bottom, and the runout difference of the coating surface (33) is monitored during the grinding process to eliminate the taper, so that the inner ring size and runout of the outer ring block (3) meet the requirements, and the grinding of the coating surface (33) of the outer ring block (3) is completed.

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