Method for controlling punching and riveting deformation of large-diameter stationary blade ring sector section assembly

Abstract

The invention provides a large-diameter stationary blade ring sector section assembly punching and riveting deformation control method, and belongs to the technical field of gas turbine manufacturing. The large-diameter stationary blade ring sector section assembly punching and riveting deformation control method comprises the steps that an assembly tool is designed and comprises an arc-shaped positioning plate and supporting strips; the stationary blade ring section with the mortise is placed on the supporting strip, the air inlet end face or the exhaust end face of the stationary blade ring section makes contact with the supporting strip, pressure is applied to the inner ring of the stationary blade ring section, and the outer ring of the stationary blade ring section abuts against the side face of the inner ring of the arc-shaped positioning plate; the tenons of the multiple blades are sequentially installed in the mortises of the stationary blade ring section; and a punching and riveting tool is used for punching and riveting the position near each mortise in the end face, back to the supporting strip, of the stationary blade ring section to form a groove, and the punching and riveting position is located on one side of the bottom of the mortise. According to the treatment scheme, the deformation of each ring section of the stationary blade ring can be controlled within 0.25 mm, interference between the outer ring of the stationary blade ring and the circumferential groove of the air compressor cylinder body is avoided, and it is ensured that the stationary blade ring is smoothly installed in the air compressor cylinder body.

Description

Technical Field

[0001] The present application relates to the field of gas turbine manufacturing, and in particular to a method for controlling the punching and riveting deformation of a large-diameter stator vane ring segment assembly. Background Art

[0002] The stator vane ring is one of the core components of the compressor of a gas turbine. During the working process, it is in a working environment of high temperature, high pressure, and high corrosiveness, which makes its processing and assembly accuracy directly affect the air compression performance of the compressor. Therefore, it is extremely important to ensure the processing and assembly quality of the stator vane ring. The stator vane ring is divided into several fan-shaped ring segments of different lengths along the circumferential direction. Each ring segment has a plurality of dovetail-shaped tenon grooves with different numbers, and can be assembled and connected with the blade tenons through a punching and riveting process. When installing the stator vane ring, its outer ring needs to be slid along the circumferential groove on the compressor cylinder block into the accurate position of the cylinder block. Since the stator vane ring has a large-diameter thin-wall structure and a large number of tenon grooves, it is extremely easy to deform during the punching and riveting assembly process, resulting in interference with the cylinder block and making the installation extremely difficult. To ensure the smooth installation of the stator vane ring, it is usually necessary to manually grind the deformed parts at both ends of the outer ring of the stator vane ring, resulting in a decrease in the processing accuracy of the stator vane ring and having a certain impact on the performance and even the service life of the compressor. In the existing stator vane ring assembly technology, the assembly fixture used has insufficient restraint on the stator vane ring, the manual punching and riveting tool is prone to bounce and slip, the punching and riveting force and the depth change range of the pile driving groove are large, and at the same time, no pre-deformation measures are taken, resulting in an average deformation amount of each ring segment of a single stator vane ring up to 0.3 mm - 0.9 mm, and the maximum value up to more than 1.2 mm. Summary of the Invention

[0003] In view of this, the present application provides a method for controlling the punching and riveting deformation of a large-diameter stator vane ring segment assembly, which solves the problem of excessive punching and riveting deformation during the assembly of the stator vane ring, can control the deformation amount of each ring segment of the stator vane ring within 0.25 mm, avoid interference between the outer ring of the stator vane ring and the circumferential groove of the compressor cylinder block, and ensure the smooth installation of the stator vane ring into the compressor cylinder block.

[0004] A method for controlling the punching and riveting deformation of a large-diameter stator vane ring segment assembly provided by the present application adopts the following technical solutions:

[0005] A method for controlling the punching and riveting deformation of a large-diameter stator vane ring segment assembly includes:

[0006] Step 1, designing an assembly tooling. The assembly tooling includes an arc-shaped positioning plate and a support bar. The support bar is located on the inner ring side of the arc-shaped positioning plate. The inner ring side surface of the arc-shaped positioning plate matches the outer peripheral side surface of the stator vane ring segment of the stator vane ring segment assembly. The support bar is used to contact the air inlet end face or the exhaust end face of the stator vane ring segment.

[0007] Step 2: Place the stator blade ring segment with the mortise groove on the support bar. The intake end face or exhaust end face of the stator blade ring segment contacts the support bar, and pressure is applied to the inner ring of the stator blade ring segment so that the outer ring of the stator blade ring segment abuts against the inner ring side surface of the arc-shaped positioning plate;

[0008] Step 3: Sequentially insert the tenons of multiple blades into the mortise grooves of the stator blade ring segment;

[0009] Step 4: Use a riveting tool to punch and rivet near each mortise groove on the end face of the stator blade ring segment facing away from the support bar to form a groove. The punching and riveting position is on one side of the bottom of the mortise groove;

[0010] Step 5: Release the pressure applied to the inner ring of the stator blade ring segment, turn over the stator blade ring segment and the blades together, repeat Step 2 so that the other end face of the stator blade ring segment contacts the support bar, and repeat Step 4.

[0011] Optionally, in Step 2, a gasket is pasted on the inner ring side surface of the arc-shaped positioning plate. The gasket corresponds to the outer peripheral side surfaces at both ends in the circumferential direction of the stator blade ring segment. The gasket covers the entire axial length range of the stator blade ring segment, and the pressure applied to the inner ring of the stator blade ring segment corresponds to the middle in the circumferential direction of the stator blade ring segment.

[0012] Optionally, the thickness of the gasket is 0.5 mm, 0.75 mm, 1 mm or 1.25 mm. The longer the circumferential distance of the stator blade ring segment, the greater the thickness of the gasket.

[0013] Optionally, in Step 2, several support pieces are pasted on the support bar. The support pieces correspond one-to-one to the mortise grooves on the stator blade ring segment, and the support pieces are used to abut against the tenons installed in the mortise grooves.

[0014] Optionally, the support piece is a copper sheet, and the thickness of the copper sheet is 0.1 mm.

[0015] Optionally, in Step 2, a bow-shaped clamp is used to apply pressure to the inner ring of the stator blade ring segment. The bow-shaped clamp includes a C-shaped rod and a screw rod. One end of the screw rod is threadedly connected to one end of the C-shaped rod. One end of the screw rod is used to abut against the outer ring side surface of the arc-shaped positioning plate. A top block is provided at the other end of the C-shaped rod, and the top block is used to abut against the area between two adjacent mortise grooves on the stator blade ring segment.

[0016] Optionally, the C-shaped rod includes a connecting rod and end rods connected to both ends of the connecting rod. The connecting rod is provided with an abutting block that abuts against the axial end face of the arc-shaped positioning plate. The included angle between the side surface of the abutting rod facing the arc-shaped positioning plate and the length direction of the end rod is less than 90 degrees. When the side surface of the abutting rod facing the arc-shaped positioning plate fits with the axial end face of the arc-shaped positioning plate, the extending direction of the end rod matches the length direction of the mortise groove.

[0017] Optionally, in step 4, the depth of the groove formed by impact riveting is 0.25 - 0.4 mm.

[0018] Optionally, the method for controlling the impact riveting deformation of the large-diameter stator vane ring segment assembly further includes step 6, where both ends of the outer circle of the stator vane ring segment are brought into contact with the inner arc surface of the measuring tool, and a feeler gauge is used to detect the maximum gap between the middle position of the outer circle of the stator vane ring segment and the inner arc surface of the measuring tool.

[0019] In summary, the present application includes the following beneficial technical effects:

[0020] By applying pressure to the middle part in the circumferential direction of the corresponding stator vane ring segment, the stator vane ring segment is made to fit the inner side surface of the arc-shaped positioning plate. However, due to the presence of the gasket, the two ends of the stator vane ring segment will contract inward, so that the stator vane ring segment has an inward pre-deformation in the radial direction, which offsets part of the outward opening deformation of the stator vane ring segment during impact riveting, helping to reduce the impact riveting deformation amount of the stator vane ring.

[0021] The impact riveting groove depth feedback mechanism is designed to control and adjust the impact riveting force, thereby reducing the contact stress between the blade tenon and the working surface of the tenon groove of the stator vane ring segment, and further reducing the impact riveting deformation amount of the stator vane ring.

[0022] By optimizing the assembly tooling and impact riveting tools, controlling the impact riveting force and the depth of the pile groove, and pre-deformation, the deformation amount of the stator vane ring can be significantly reduced to within 0.25 mm, improving the first-pass success rate of the stator vane ring assembly and ensuring that the stator vane ring can be successfully installed into the compressor cylinder block. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the large-diameter stator vane ring segment assembly of the embodiment of the present application;

[0025] Figure 2 It is a schematic structural diagram of the stator vane ring segment and the blade fixed on the assembly tooling in the embodiment of the present application;

[0026] Figure 3 It is a schematic structural diagram of the assembly tooling in the embodiment of the present application;

[0027] Figure 4 It is a schematic structural diagram of the bow-shaped clamp in the embodiment of the present application.

[0028] Description of reference numerals: 1, blade; 2, stator vane ring segment; 3, base; 31, arc-shaped positioning plate; 32, support bar; 4, bow-shaped clamp; 41, C-shaped rod; 42, pressing block; 43, screw; 44, handle; 45, top block; 46, abutting block; 5, gasket. Detailed implementation manners

[0029] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0030] The following uses specific specific examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts belong to the scope of protection of the present application.

[0031] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0032] It should also be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. The drawings only show the components related to the present application, rather than being drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in its actual implementation can be an arbitrary change, and the component layout type may also be more complex.

[0033] In addition, in the following description, specific details are provided for the purpose of facilitating a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0034] The embodiments of the present application provide a method for controlling the punching and riveting deformation of a large-diameter stator vane ring fan segment assembly.

[0035] As shown Figures 1 to 4 in the figure, a method for controlling the riveting deformation of a large-diameter stator vane ring fan segment assembly includes:

[0036] Step 1: Design an assembly tooling. The assembly tooling includes a base 3, an arc-shaped positioning plate 31 and a support bar 32. The arc-shaped positioning plate 31 and the support bar 32 are fixed on the base 3. The support bar 32 is located on the inner ring side of the arc-shaped positioning plate 31. The inner ring side surface of the arc-shaped positioning plate 31 matches the outer peripheral side surface of the stator vane ring segment 2 of the stator vane ring fan segment assembly. The support bar 32 is used to contact the air inlet end face or the air outlet end face of the stator vane ring segment 2.

[0037] Step 2: Place the stator vane ring segment 2 processed with a mortise on the support bar 32. The air inlet end face or the air outlet end face of the stator vane ring segment 2 contacts the support bar 32, and pressure is applied to the inner ring of the stator vane ring segment 2 to make the outer ring of the stator vane ring segment 2 abut against the inner ring side surface of the arc-shaped positioning plate 31.

[0038] Step 3: Sequentially insert the tenons of multiple blades 1 into the mortises of the stator vane ring segment 2

[0039] Step 4: Use a riveting tool to perform riveting on each mortise vicinity on the end face of the stator vane ring segment 2 facing away from the support bar 32 to form a groove. The riveting position is on one side of the bottom of the mortise

[0040] Step 5: Release the pressure applied to the inner ring of the stator vane ring segment 2, turn over the stator vane ring segment 2 and the blades 1 together, repeat Step 2 to make the other end face of the stator vane ring segment 2 contact the support bar 32, and repeat Step 4.

[0041] Step 6: Make the two ends of the outer circle of the stator vane ring segment 2 contact the inner arc surface of the measuring tool, and use a feeler gauge to detect the maximum gap between the middle position of the outer circle of the stator vane ring segment 2 and the inner arc surface of the measuring tool. If the gap amount does not exceed 0.25 mm, it can ensure that the stator vane ring can be smoothly installed into the compressor cylinder block.

[0042] In the step 2, two gaskets 5 are pasted on the inner circumferential side surface of the arc-shaped positioning plate 31. The distance between the two gaskets 5 is less than the circumferential length of the stator vane ring section 2. The two gaskets 5 correspond to the outer circumferential side surfaces at the two circumferential ends of the stator vane ring section 2. The gaskets 5 cover the entire axial length range of the stator vane ring section 2 and apply pressure to the inner ring of the stator vane ring section 2 corresponding to the middle in the circumferential direction of the stator vane ring section 2. The thickness of the gasket 5 is 0.5 mm, 0.75 mm, 1 mm or 1.25 mm. The longer the circumferential distance of the stator vane ring section 2 is, the greater the thickness of the gasket 5 is. The gasket 5 with the corresponding thickness can be selected according to the actual situation. By applying pressure to the middle in the circumferential direction of the stator vane ring section 2, the stator vane ring section 2 is made to fit the inner circumferential side surface of the arc-shaped positioning plate 31. However, due to the existence of the gasket 5, the two ends of the stator vane ring section 2 will contract inwards, so that the stator vane ring section 2 has an inward pre-deformation, which can offset part of the outward opening deformation of the stator vane ring section 2 during riveting, helping to reduce the riveting deformation amount of the stator vane.

[0043] In the step 2, a plurality of support pieces are pasted on the support bar 32. The support pieces correspond one by one to the mortise grooves on the stator vane ring section 2. The support pieces are used to abut against the tenons installed in the mortise grooves. The setting of the support pieces can prevent the tenons of the blades 1 from protruding beyond the end face of the stator vane ring after assembly. The support pieces are copper sheets, and the thickness of the copper sheets is 0.1 mm.

[0044] In the step 2, a bow-shaped clamp 4 is used to apply pressure to the inner ring of the stator vane ring section 2. The bow-shaped clamp 4 includes a C-shaped rod 41 and a screw rod 43. One end of the screw rod 43 is threadedly connected to one end of the C-shaped rod 41. One end of the screw rod 43 is used to abut against the outer circumferential side surface of the arc-shaped positioning plate 31. A top block 45 is provided at the other end of the C-shaped rod 41. The top block 45 is used to abut against the area between two adjacent mortise grooves on the stator vane ring section 2. Specifically, a cushion block is rotatably connected to the end of the screw rod 43 facing the arc-shaped positioning plate 31. A chute is provided on the outer circumferential side surface of the arc-shaped positioning plate 31. When installing the bow-shaped clamp 4, the cushion block is inserted into the chute from one end of the chute. The cushion block and the chute are in sliding fit. The position of the bow-shaped clamp 4 is adjusted by sliding the cushion block along the chute, which is convenient for adjusting the constraint and clamping position when assembling stator vane ring sections 2 with different lengths. Among them, the top block 45 is made of copper or copper-plated on the surface of the top block 45 to prevent the parts from being damaged by pressing. A handle 44 is installed at the end of the screw rod 43 away from the cushion block, which is convenient for the operator to rotate the screw rod 43.

[0045] The C-shaped rod 41 includes a connecting rod and end rods connected to both ends of the connecting rod. The connecting rod is provided with an abutting block 46 that abuts against the axial end face of the arc-shaped positioning plate 31. The included angle between the side face of the abutting rod facing the arc-shaped positioning plate 31 and the length direction of the end rod is less than 90 degrees. When the side face of the abutting rod facing the arc-shaped positioning plate 31 fits with the axial end face of the arc-shaped positioning plate 31, the extending direction of the end rod matches the length direction of the mortise groove. When rotating the screw rod 43, only by pressing the C-shaped rod 41 against the end face of the arc-shaped positioning plate 31 can the stability of the bow-shaped clamp 4 be ensured without rotation.

[0046] In the step 4, the depth of the groove formed by punching and riveting is 0.25 - 0.4 mm. By the method of measuring the depth of the groove with a dial indicator while punching and riveting the pile, the target range value of the depth of the groove for punching and riveting the pile is set to 0.25 mm - 0.4 mm. When the depth of the groove approaches the lower limit value of 0.25 mm, the operator appropriately increases the punching and riveting force; when the depth of the groove approaches or exceeds the upper limit value of 0.4 mm, the operator appropriately reduces the punching and riveting force.

[0047] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for controlling the punching and riveting deformation of a large diameter stationary blade ring segment assembly, characterized in that: include: Step 1, designing an assembly tool, the assembly tool comprising an arc-shaped positioning plate (31) and a support bar (32), the support bar (32) being located on one side of the inner ring of the arc-shaped positioning plate (31), the inner ring side surface of the arc-shaped positioning plate (31) matching the outer peripheral side surface of the stationary blade ring segment (2) of the stationary blade ring segment assembly, and the support bar (32) being used to contact the intake end surface or the exhaust end surface of the stationary blade ring segment (2); Step 2, placing the stationary blade ring segment (2) with the tongue and groove processed thereon on the support bar (32), with the air inlet end face or the exhaust end face of the stationary blade ring segment (2) contacting the support bar (32), and applying pressure to the inner ring of the stationary blade ring segment (2), so that the outer ring of the stationary blade ring segment (2) abuts against the inner ring side face of the arc-shaped positioning plate (31); Step 3, inserting the tenons of the plurality of blades (1) into the tenons of the stationary blade ring segment (2) in sequence; Step 4, using a punching and riveting tool to punch and rivet each tenon groove on the end surface of the stationary blade ring segment (2) facing away from the support bar (32) to form a groove, and the punching and riveting position is located on one side of the bottom of the tenon groove; Step 5, release the pressure applied to the inner ring of the stationary blade ring segment (2), turn over the stationary blade ring segment (2) and the blade (1) together, repeat step 2, make the other end face of the stationary blade ring segment (2) contact the support bar (32), and repeat step 4.

2. The method for controlling the punching and riveting deformation of a large diameter stationary blade ring segment assembly according to claim 1 is characterized in that: In step 2, a gasket (5) is pasted on the inner ring side surface of the arc-shaped positioning plate (31), and the gasket (5) corresponds to the outer peripheral side surface of the two circumferential ends of the stationary blade ring segment (2). The gasket (5) covers the entire axial length range of the stationary blade ring segment (2), and the pressure applied to the inner ring of the stationary blade ring segment (2) corresponds to the middle part of the stationary blade ring segment (2) in the circumferential direction.

3. The method for controlling the punching and riveting deformation of a large diameter stationary blade ring segment assembly according to claim 2 is characterized in that: The thickness of the gasket (5) is 0.5 mm, 0.75 mm, 1 mm or 1.25 mm, and the longer the circumferential distance of the stationary blade ring segment (2), the greater the thickness of the gasket (5).

4. The method for controlling the punching and riveting deformation of a large diameter stationary blade ring segment assembly according to claim 1 is characterized in that: In the step 2, a plurality of support sheets are pasted on the support strip (32), the support sheets corresponding to the tenons on the stationary blade ring segment (2) one by one, and the support sheets are used to abut against the tenons installed in the tenons.

5. The method for controlling the punching and riveting deformation of a large diameter stationary blade ring segment assembly according to claim 4 is characterized in that: The support sheet is a copper sheet, and the thickness of the copper sheet is 0.1 mm.

6. The method for controlling the punching and riveting deformation of a large diameter stationary blade ring segment assembly according to claim 1 is characterized in that: In step 2, a bow-shaped calliper (4) is used to apply pressure to the inner ring of the stationary blade ring segment (2), and the bow-shaped calliper (4) includes a C-shaped rod (41) and a screw (43), one end of the screw (43) is threadedly connected to one end of the C-shaped rod (41), one end of the screw (43) is used to abut the outer ring side of the arc-shaped positioning plate (31), and the other end of the C-shaped rod (41) is provided with a top block (45), and the top block (45) is used to abut the area between two adjacent tenons on the stationary blade ring segment (2).

7. The method for controlling the punching and riveting deformation of a large diameter stationary blade ring segment assembly according to claim 6 is characterized in that: The C-shaped rod (41) includes a connecting rod and end rods connected to both ends of the connecting rod, the connecting rod is provided with an abutment block (46) abutting against the axial end face of the arc-shaped positioning plate (31), the angle between the side face of the abutment rod facing the arc-shaped positioning plate (31) and the length direction of the end rod is less than 90 degrees, when the side face of the abutment rod facing the arc-shaped positioning plate (31) and the axial end face of the arc-shaped positioning plate (31) are in contact with each other, the extension direction of the end rod matches the length direction of the mortise.

8. The method for controlling the punching and riveting deformation of a large diameter stationary blade ring segment assembly according to claim 1 is characterized in that: In step 4, the depth of the groove formed by punching and riveting is 0.25-0.4 mm.

9. The method for controlling the punching and riveting deformation of a large diameter stationary blade ring segment assembly according to claim 1 is characterized in that: The method for controlling the punching and riveting deformation of a large-diameter stationary blade ring segment assembly also includes step 6, wherein both ends of the outer circle of the stationary blade ring segment (2) are brought into contact with the inner arc surface of a measuring tool, and a feeler gauge is used to detect the maximum gap between the middle position of the outer circle of the stationary blade ring segment (2) and the inner arc surface of the measuring tool.

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