Power turbine rotor riveting tool and riveting method

Abstract

The present invention discloses a power turbine rotor riveting tool and riveting method, wherein the riveting tool includes a coaxially arranged rotor tray and a rivet tray, the rotor tray is used to support the turbine disk, and the rivet tray is a circular tray, which is used to support the turbine blades and rivets pre-installed on the turbine disk; the riveting tool also includes a press and an upper structure that cooperates with the press to push rivets for riveting; the rivet tray is provided with a rivet hole for rivet insertion and subsequent riveting, and after the turbine disk is placed on the rotor tray, each rivet hole can be aligned with the rivet hole in sequence by rotation to pre-install the rivet. The present invention provides a rotor tray and a rivet tray that are independent of each other. When both are positioned so that they cannot rotate, the rivet holes are used to pre-install all rivets; the rotor tray is then controlled to drive the turbine disk to rotate synchronously, and the riveting is completed in sequence. This riveting tool can achieve "complete assembly and complete pressing" riveting of rivets, significantly improving the assembly efficiency of the power turbine rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of parts riveting, and in particular to a power turbine rotor riveting tool and a riveting method. Background Art

[0002] The power turbine rotor of a certain type of aviation turboprop engine has a unique structure. The power turbine wheel has multiple mortises evenly distributed around the circumference. The mortises are at a certain angle to the wheel axis. Semicircular grooves are opened at the mortise of the turbine wheel and at the bottom of the blade tenon. After the blade is installed in the mortise, a circular hole is formed. Rivets and washers are then inserted and the blade is fixed by punching the rivet head.

[0003] The current riveting method for the above-mentioned power turbine rotor is to use a fixture and a hydraulic press to assemble and punch the blades and rivets, such as Figure 6 and Figure 7 As shown, the turbine rotor is supported by a base 61 and a positioning circle 62 on the base. A screw 63 is provided on the positioning circle to fix the base and the turbine disk. A support block 64 is provided on the base. A punch 65 is provided in a hole above the support block. A fixed top cone 66 is provided on the base. The top cone and the punch are coaxial and coplanar with the center of the positioning circle.

[0004] During assembly, first install the turbine blades into the wheel disc's tenon from top to bottom, insert the rivets into the tenon from bottom to top, and then place the washers over the rivets. Holding the rivets by hand, rotate the turbine disc until the top cone contacts the rivet head, securing the rivet below. Because the axis of the wheel disc's tenon is not parallel to the disc's centerline but at a certain angle, the end face of the locating circle supports the horizontal at a corresponding angle, tilting the tenon at the punching position accordingly and aligning the axis vertically. Then, use the press to apply downward pressure to the punch, causing the front cone of the punch to press on the rivet, expanding it. After riveting is complete, repeat the above steps for assembly at the next location.

[0005] The above riveting method has the following defects:

[0006] 1) During the assembly process, the turbine disk needs to be manually rotated to align the rivet head hole with the punch. However, the turbine disk is heavy and the circumferential position is difficult to control. In addition, the operator's visual judgment of whether the punch and the rivet head are aligned is very large, and the punching and riveting position is prone to offset. The punch deviates to one side of the rivet, causing the rivet to be "thick on one side and thin on the other side" and rivet cracks. Even if the punch presses on the turbine disk, it may cause a dent in the turbine disk.

[0007] 2) Before stamping, the rivets are assembled manually and the turbine disk is rotated so that the tooling presses against the bottom end face of the rivet, which is then forced to lock. Since the rivet and the ejector are located below the tooling and are at a lower height than the operating table, and the turbine rotor is relatively large, the operator cannot visually observe whether the ejector pin of the tooling is aligned with the rivet and can only judge by touch. This can easily cause the rivet and the ejector pin to be misaligned, resulting in the tooling crushing the turbine disk during the riveting process, or the rivet being deflected or bent due to the downward pressure of the punch and the upward reaction force of the ejector pin being out of sync.

[0008] 3) The power turbine has dozens of mortises and grooves evenly distributed around the circumference, requiring the assembly and punching of multiple rivets. Limited by the existing tooling structure, the assembly process involves installing a blade, rivet, and gasket, rotating the turbine disk once to control the position, punching once, and then installing and riveting the next blade, rivet, etc. The entire process is inefficient and time-consuming.

[0009] Patent publication number CN116060572A discloses an automated riveting system and method for aircraft engine turbine rotors. The upper and lower riveting heads are mounted on columns, while the turbine rotary table and riveting quality inspection device are mounted on a horizontal platform. The turbine disc is tilted on the rotary table to maintain the riveted holes in a vertical orientation. Visual inspection cameras and force-displacement sensors ensure smooth rivet insertion and alignment of the riveting force with the rivet axis. The force-displacement sensor is used to accurately control the riveting force and distance. The upper and lower riveting heads, horizontal platform, and turbine rotary table are manually adjustable.

[0010] Although this patent improves the overall riveting quality and production efficiency through relevant technical features, in reality, the riveting system can only install one rivet at a time like the traditional riveting method, and then rotate the turbine disk to the riveting position to install the next rivet for riveting. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide a power turbine rotor riveting tool that can significantly improve the punching and riveting efficiency and the punching and riveting automation effect in response to the defects of the existing technology.

[0012] The purpose of the present invention is achieved through the following technical solutions:

[0013] A power turbine rotor riveting tool comprises a coaxially arranged rotor tray and a rivet tray, wherein the rotor tray is used to support the turbine disk, and the rivet tray is a circular tray, and is used to support turbine blades and rivets pre-installed on the turbine disk; the riveting tool also comprises a press and an upper top structure that cooperates with the press to lift rivets for riveting; the rivet tray is provided with a rivet hole for rivet insertion and subsequent riveting, and after the turbine disk is placed on the rotor tray, each rivet hole can be aligned with the rivet hole in turn by rotation to pre-install the rivets.

[0014] Furthermore, it also includes a connecting rod portion, which is connected to the rivet tray and fixes the position of the rivet tray. The connecting rod portion and the rotor tray are detachably connected.

[0015] Furthermore, the upper structure includes a top cone and a cylinder, and the top cone and the cylinder are connected and driven by the cylinder to abut against the rivet head.

[0016] Furthermore, the press is a servo press with a floating device.

[0017] Furthermore, it also includes an anti-foolproof block, which is connected to the turbine rotor through the concave and convex parts, and the anti-foolproof block is connected to the rotor tray through a connecting piece; the anti-foolproof block needs to be installed on the riveting tooling for use after all rivets are pre-installed.

[0018] Furthermore, a rotating platform is included, and the rotating platform is used to control the rotation of the rotor plate.

[0019] Furthermore, the rotating platform and the rotor tray are connected by pins.

[0020] Furthermore, a plurality of positioning pins are provided on the rotating platform, and a plurality of pin holes for inserting the positioning pins are correspondingly provided on the rotor tray.

[0021] Furthermore, the rotating platform is provided with a dividing turntable.

[0022] The present invention also provides a method for riveting a power turbine rotor using the above-mentioned riveting tool, comprising the following steps:

[0023] S1. Position the rotor tray and rivet tray so that they cannot rotate, and place the turbine disc on the rotor tray;

[0024] S2. Rotate the turbine disk so that the multiple mortises on the turbine disk are aligned with the rivet holes on the rivet tray in sequence. Each time the mortise is aligned, a turbine blade is installed into the mortise and a rivet is inserted into the rivet hole on the back of the rivet tray.

[0025] S3 rotate the turbine disk, so that the pre-installed rivets and blades of the mortise and tenon holes and rivet holes staggered, followed by pre-installed the remaining turbine blades and rivets;

[0026] S4. After pre-installing the turbine blades and rivets, assemble the turbine disk gasket.

[0027] S5. Rotate the turbine disc to align the press and the upper structure with the riveting holes, and complete the riveting of each rivet in sequence.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1) The present invention's riveting tooling utilizes independent rotor and rivet trays. Once both are positioned so that they cannot rotate, all rivets are pre-installed using the rivet holes on the rivet tray. The rotor tray then controls the synchronous rotation of the turbine disk, allowing the pre-installed rivets to rotate with the rotor tray until they reach the rivet holes on the rivet tray, completing the riveting process. This riveting tooling upgrades the traditional "install and press" riveting method to a "complete assembly and press" method, where the complete disk blades and rivets are assembled before riveting and pressing the entire disk. This reduces labor costs and significantly improves the automated assembly and efficiency of turbine rotors.

[0030] 2) The present invention introduces a selection platform with a graduated turntable and a servo press with a floating device. During the rotor assembly process, the graduated turntable rotates regularly in the circumferential direction according to the rotor tenon-groove structure to achieve primary positioning, and the floating device of the servo press head performs secondary positioning, forming a secondary positioning method of coarse positioning + fine positioning, ensuring the coaxiality of the press head and parts during the press assembly of the power turbine rotor and improving the riveting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the assembly structure of the rotor tray, rivet tray, and connecting rod portion according to Example 1 of the present invention;

[0032] Figure 2 for Figure 1 A schematic diagram of the back of the assembly structure shown;

[0033] Figure 3 This is a schematic structural diagram of the rotating platform according to Example 1 of the present invention;

[0034] Figure 4 for Figure 1 A schematic diagram of the structure of the assembly structure shown being installed on a rotating platform;

[0035] Figure 5 This is a schematic diagram of the structure of the power turbine rotor being installed on the riveting tool;

[0036] Figure 6 Schematic diagram of the structure of a traditional riveting tool in the background technology;

[0037] Figure 7 This is a schematic diagram of the traditional riveting tool positioning circle driving the turbine disk to tilt for riveting. DETAILED DESCRIPTION

[0038] In order to clearly illustrate the technical features of this solution, the technical solution is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0040] In addition, in the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0043] Example 1

[0044] A power turbine rotor riveting tool, such as Figure 1As shown, the rotor tray 1 and rivet tray 2 are coaxially arranged. Seen axially, the rivet tray 2 is located above the outer periphery of the rotor tray 1. The rotor tray 1 supports the turbine disk, while the rivet tray 2 is a circular ring-shaped tray that supports the turbine blades and rivets pre-installed on the turbine disk. A connecting rod 3 is provided on the back of the rivet tray 2. The connecting rod 3 and rivet tray 2 are bolted together to secure the rivet tray in place. The connecting rod 3 and the rotor tray 1 are "detachably connected," meaning they can be connected or disconnected depending on the needs.

[0045] like Figure 2 As shown, a rivet hole 21 is provided on the rivet tray 2 for inserting rivets and subsequent riveting. The diameter of the rivet hole 21 is larger than the diameter of the rivet end face to facilitate the assembly of the rivet. After the turbine disc is placed on the rotor tray 1, each rivet hole can be aligned with the rivet hole 21 in turn by rotation to pre-install the rivet.

[0046] like Figure 3 and Figure 4 As shown, the riveting tool also includes a rotating platform 4, which includes a supporting platform 41 for contacting the back of the rotor tray 1 to support the rotor tray. A plurality of positioning pins 411 are provided on the supporting platform 41, and a plurality of pin holes 11 for inserting the positioning pins are correspondingly provided on the rotor tray 1, so as to realize the pin connection and positioning cooperation between the rotor tray 1 and the rotating platform 4, so as to control the axial rotation of the rotor tray 1.

[0047] The rotating platform 4 further includes a tilt control device 42 for controlling the tilt of the rotor tray 1 so that the rivet holes in the riveted state are arranged in a vertical direction. The tilt control device is conventional technology and will not be described in detail here.

[0048] like Figure 2 As shown, a connecting rod 3 is provided on each symmetrical side of the rivet tray 2. The connecting rod 3 comprises a rod portion 31 and a connecting portion 32 connected to each other. The rod portion 31 is connected to the tilt control device 42 of the rotating platform, and the connecting portion 32 extends to the back of the rotor tray 1. When the rotor tray 1 does not need to rotate, the connecting portion 32 is bolted to the rotor tray 1. When the rotor tray 1 needs to rotate, the bolts connecting the two can be removed.

[0049] The supporting platform 41 of this embodiment is provided with a dividing turntable, which can be axially rotated according to the uniform distribution angle of the tenon grooves of the power turbine rotor.

[0050] The riveting tooling also includes a press and a top structure that works with the press to push the rivet. The top structure consists of a connected top cone and a cylinder. The top cone is driven by the cylinder to abut the rivet head. The press is a common servo press with a floating device.

[0051] This riveting tool introduces an indexing turntable and a servo press. During the assembly of the power turbine rotor, the indexing turntable is rotated axially at a specified angle according to the tenon-groove structure of the power turbine rotor to achieve primary positioning. The floating device of the servo press head is then used for secondary positioning, forming a secondary positioning method of coarse positioning plus fine positioning. This can ensure the coaxiality of the ram and parts during the press-assembly of the power turbine rotor, ensure good uniformity of the parts, and improve product quality.

[0052] After the turbine disc is placed on the rotor tray 1, in order to ensure that the turbine disc rotates synchronously with the rotor tray 1 during the formal riveting process, a device such as the following is provided on the back of the rotor tray 1: Figure 5 The illustrated block 5 is connected to the turbine rotor via interlocking recesses and projections. Specifically, the block 5 is provided with multiple U-shaped grooves that align the protruding claws on the front journal of the power turbine rotor. The block 5 is bolted to the rotor tray 1. It should be noted that the block 5 must be pre-installed with all rivets before being installed on the riveting tool.

[0053] The riveting tool of the present invention solves the support problem of blades and rivets by providing a rivet tray, and changes the riveting method of the power turbine rotor from the traditional "one assembly and one press" to "whole assembly and whole press", which can significantly improve the assembly efficiency of the power turbine rotor.

[0054] Example 2

[0055] Based on Example 1, this embodiment limits the number of positioning pins on the carrier platform. Only two symmetrically arranged positioning pins are required on the carrier platform to cooperate with the rotor tray to meet the requirement that the rotor tray is driven by the rotating platform for synchronous axial rotation.

[0056] Example 3

[0057] This embodiment describes in detail the riveting process of the riveting tool of Example 1, including the following steps:

[0058] S1. Assemble the rotor tray 1, rivet tray 2, and connecting rod 3 and place them on a supporting platform. The connecting portion 32 of the connecting rod 3 and the back of the rotor tray 1 are bolted together. The supporting platform is a conventional platform that allows the rotor tray 1 and rivet tray 2 to be positioned so that they cannot rotate. Place the turbine disk on the rotor tray 1.

[0059] S2 manually rotate the turbine disk, so that the turbine disk on the plurality of mortises sequentially aligned with the rivet holes 21 on the rivet tray 2, each time aligned, a turbine blade is installed into the mortise, a rivet from the rivet hole 21 on the back of the rivet tray 2 into the disposal;

[0060] S3 rotate the turbine disk, so that the pre-installed rivets and blades of the tenon and rivet holes 21 staggered, by the rivet tray 2 supporting the pre-installed rivets and blades; then rotate the turbine disk clockwise or counterclockwise, followed by pre-installed turbine blades and rivets;

[0061] S4. After pre-installing the turbine blades and rivets, assemble the turbine disk gasket.

[0062] S5. Assemble the anti-fouling block 5 on the rotor tray 1 to connect the turbine disc and the rotor tray 1 as a whole. Then, move the assembled whole onto the rotating platform 4. Use the rotor tray 1 and the support platform 41 to pin it. Then, remove the connecting bolts between the rotor tray 1 and the connecting portion 32. Turn on the rotating platform 4 in working mode. It rotates evenly axially at a set angle to align the tenon with the servo press head. The rotor tray drives the turbine disc and the support platform to rotate synchronously. When the tenon rotates to the rivet hole 21 on the rivet tray, the rivet head is exposed. At this time, the cylinder moves the top cone upward to support the rivet head, limiting and supporting the rivet. The servo press head first contacts the rivet downward. The floating device of the servo press fine-tunes the axis of the rivet head and the rivet hole to achieve secondary positioning to ensure that the rivet head and the rivet are coaxial. Then, punch the rivet to complete the riveting. Finally, follow this operation to complete the riveting of the remaining rivets.

[0063] Obviously, the above embodiments are merely examples for the purpose of clearly illustrating the technical solutions of the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A power turbine rotor riveting tool, characterized in that , including a coaxially arranged rotor tray and a rivet tray, the rotor tray is used to support the turbine disk, the rivet tray is a circular tray, and the rivet tray is used to support the turbine blades and rivets pre-installed on the turbine disk; the riveting tool also includes a press and an upper top structure that cooperates with the press to push the rivets for riveting; the rivet tray is provided with a rivet hole for rivet insertion and subsequent riveting. After the turbine disk is placed on the rotor tray, each rivet hole can be aligned with the rivet hole in turn by rotation to pre-install the rivets.

2. The power turbine rotor riveting tool according to claim 1, characterized in that: It also includes a connecting rod portion, which is connected to the rivet tray and fixes the position of the rivet tray. The connecting rod portion and the rotor tray are detachably connected.

3. The power turbine rotor riveting tool according to claim 1, characterized in that: The upper structure includes a top cone and a cylinder. The top cone and the cylinder are connected and driven by the cylinder to abut against the rivet head.

4. The power turbine rotor riveting tool according to claim 1, characterized in that: The press is a servo press with a floating device.

5. The power turbine rotor riveting tool according to claim 1, characterized in that: It also includes an anti-foolproof block, which is connected to the turbine rotor through a concave and convex part, and the anti-foolproof block is connected to the rotor tray through a connecting piece; the anti-foolproof block needs to be installed on the riveting tooling after all rivets are pre-installed.

6. The power turbine rotor riveting tool according to claim 1, characterized in that: The invention also includes a rotating platform, which is used to control the rotation of the rotor plate.

7. The power turbine rotor riveting tool according to claim 6, characterized in that: The rotating platform and the rotor tray are connected by pins.

8. The power turbine rotor riveting tool according to claim 7, characterized in that: A plurality of positioning pins are provided on the rotating platform, and a plurality of pin holes for inserting the positioning pins are correspondingly provided on the rotor tray.

9. The power turbine rotor riveting tool according to claim 6, characterized in that: The rotating platform is provided with a dividing turntable.

10. A method for riveting a power turbine rotor using the riveting tool according to any one of claims 1 to 9, characterized in that: The steps include: S1. Position the rotor tray and rivet tray so that they cannot rotate, and place the turbine disc on the rotor tray; S2. Rotate the turbine disk so that the multiple mortises on the turbine disk are aligned with the rivet holes on the rivet tray in sequence. Each time the mortise is aligned, a turbine blade is installed into the mortise and a rivet is inserted into the rivet hole on the back of the rivet tray. S3 rotate the turbine disk, so that the pre-installed rivets and blades of the mortise and tenon holes and rivet holes staggered, followed by pre-installed the remaining turbine blades and rivets; S4. After pre-installing the turbine blades and rivets, assemble the turbine disk gasket. S5. Rotate the turbine disc to align the press and the upper structure with the riveting holes, and complete the riveting of each rivet in sequence.

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