Multifunctional integrated machining clamp and machining method for tenon of poly-cascade stator blade and connecting plate

Abstract

The application provides a multifunctional integrated machining clamp for multiple static vane tenon and connecting plate, and belongs to the technical field of aircraft engine machining, comprising a clamp base, guide rails fixed on the clamp base, a positioning seat for fixing the vane tenon, a hinge structure for connecting the positioning seat on the guide rails, a hook-shaped pressing plate for pressing the vane, a ball head pin fixed on the positioning seat as a reference, and a profiling pressing plate for being installed on the positioning seat, and the connecting plate to be machined is installed on the profiling pressing plate, wherein a plurality of work stations for installing the vane tenon side by side are arranged on the positioning seat, and a composite cavity which is completely consistent with the bottom profile, angle and spatial distribution of the vane tenon is machined on the profiling pressing plate. The clamp reduces the reference conversion error of the split sequence machining through one-time clamping and profiling reference transmission, and forcibly ensures the accuracy of the key position degree between the tenon and the connecting plate at the process source.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine processing technology, specifically relating to a multi-functional integrated processing fixture and processing method for tenons and connecting plates of multi-unit stator blades. Background Technology

[0002] In the field of aero-engine manufacturing, stator blades, as core aerodynamic components, directly affect the efficiency and reliability of the engine due to their machining accuracy. Currently, the industry generally adopts the traditional process of "sequential machining with specialized fixtures" for processing blade tenons and their connecting plates. While this process is widely used, it suffers from a series of inherent and interconnected technical bottlenecks, severely restricting the improvement of product quality and production efficiency. This leads to the following problems: (1) Since the bottom surface of the tenon is often a complex spatial curved surface with precision grooves, its processing itself requires extremely high positioning stability. Sequential processing means that the workpiece needs to undergo two independent clamping and positioning. Each clamping will bring unavoidable errors. These errors cannot be canceled between the two clampings, but will accumulate and be transmitted. This will cause problems such as assembly stress or out-of-tolerance when assembling multiple blades into a ring assembly.

[0003] (2) The positional accuracy of the connecting hole on the bottom surface of the tenon and the corresponding hole system on the connecting plate is difficult to guarantee. The machining datum of the connecting plate depends entirely on the manufacturing accuracy of the second set of fixtures, rather than the actual position of the tenon hole after the previous process. This machining mode is very likely to cause the coaxiality of the hole system to exceed the tolerance. In actual production, this often forces the assembly process to carry out a lot of time-consuming "selection and matching", "repair and filing" or even rework.

[0004] (3) In terms of processing efficiency and economy, this model exhibits significant inefficiency and lack of flexibility. The serial processing of a single blade or a small number of blades results in auxiliary time such as clamping, tool setting, and changeover accounting for an excessively high proportion of the total time per piece, leading to low equipment utilization and failing to meet the high efficiency requirements of modern aero-engine mass production. In addition, this model has poor process flexibility. When the product design undergoes minor iterations and "smaller" parts with slightly different dimensions appear, the original dedicated fixtures need to be reworked or become completely ineffective, which will lead to increased costs and extended manufacturing cycles. Summary of the Invention

[0005] The purpose of this invention is to address the inherent defects in the existing stator blade machining process by providing an integrated fixture and method to solve the technical problems of inconsistent machining datum, difficulty in guaranteeing the positional accuracy of key features, low production efficiency, and inability to quickly adapt to dimensional variations within the product family caused by multiple clamping operations.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-functional integrated machining fixture for multi-unit stator blade tenons and connecting plates, comprising a fixture base, a guide rail fixed on the fixture base, a positioning seat for fixing the blade tenon, a hinge structure for connecting the positioning seat to the guide rail, a hook-shaped pressure plate for pressing the blade, a ball-head pin fixed on the positioning seat as a reference, and a contouring pressure plate for mounting on the positioning seat. The connecting plate to be machined is mounted on the contouring pressure plate. The positioning base is provided with multiple workstations for installing blade tenons side by side. The contouring plate is machined with a composite cavity that is completely consistent with the bottom contour, angle and spatial distribution of the blade tenon.

[0007] The multi-functional integrated machining fixture for the tenon and connecting plate of the multi-unit stator blade provided by the present invention also has the following technical feature: the guide rail includes a horizontal guide rail and a vertical guide rail, and the positioning seat can be converted between the horizontal guide rail and the vertical guide rail.

[0008] The multi-functional integrated processing fixture for the tenon and connecting plate of the multi-stage stator blade provided by the present invention also has the following technical feature: the number of hook-shaped pressure plates is twice the number of blades, and each blade corresponds to two hook-shaped pressure plates.

[0009] The multi-functional integrated machining fixture for the multi-stage stator blade tenon and connecting plate provided by the present invention also has the following technical feature: the positioning seat is provided with a replaceable positioning pin on its side.

[0010] The multi-functional integrated machining fixture for the tenon and connecting plate of the multi-stage stator blade provided by the present invention also has the following technical features: the contouring pressure plate is a rectangular plate, and the spatial distribution of the composite cavity is consistent with that of the multiple blades fixed on the positioning seat.

[0011] Another object of the present invention is to provide a multi-functional integrated machining method for tenons and connecting plates of multi-stage stator blades, the method utilizing a fixture as described in any of the preceding claims, including; S1. Use the ball head pin for initial alignment and fix the blade tenon on the positioning seat; S2. Machining the blade tenon; S3. Take out the processed blade tenon, install the contour plate on the positioning seat, and press the connecting plate onto the upper surface of the contour plate. S4. Machining the outline and hole system of the connecting plate.

[0012] The multi-functional integrated processing method for the tenon and connecting plate of the multi-stage stator blade provided by the present invention also has the following technical feature: the initial alignment using the ball head pin includes tooling alignment by touching the ball head pin with the machine tool probe.

[0013] The multi-functional integrated processing method for multi-stage stator blade tenons and connecting plates provided by this invention also has the following technical features: fixing the blade tenons on the positioning seat includes first placing the blade tenons sequentially into the work positions of the positioning seat, then inserting the positioning pins, and finally pressing the bottom of the blade tenons with a hook-shaped pressure plate.

[0014] The multi-functional integrated processing method for the tenon and connecting plate of the multi-stage stator blade provided by the present invention also has the following technical features: the processing of the blade tenon includes sequentially processing the bottom arc groove, end face and radial hole of the blade tenon.

[0015] The multi-functional integrated processing method for the tenon and connecting plate of the multi-unit stator blade provided by the present invention also has the following technical features: the processing method includes horizontal processing and vertical processing, and the conversion between horizontal processing and vertical processing is achieved by loosening the locking device of the hinge structure and rotating the positioning seat 90° on the guide rail.

[0016] Beneficial effects: The multi-functional integrated machining fixture for the tenon and connecting plate of the multi-unit stator blade provided in this application reduces the datum conversion error of sequential machining through one-time clamping and contour datum transfer. It forcibly guarantees the accuracy of the critical position between the tenon and the connecting plate at the source of the process, reducing the workload of assembly and debugging by more than 70%. The multi-unit clamping ensures the consistency of batch processing, and the multi-unit synchronous processing and process integration reduce the repeated clamping and transfer time by about 80%, thereby improving the overall processing efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A top view of the fixture provided in the embodiment of the present invention; Figure 2 This is a front view of the fixture provided in the embodiment of the present invention. Among them, 1: blade; 2: contour plate; 3: connecting plate to be processed; 4: positioning pin; 5: positioning seat; 6: fixture base; 7: hinge structure; 8: guide rail; 9: hook-shaped plate; 10: ball head pin. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0020] In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the 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. Therefore, they should not be construed as limiting the invention.

[0021] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0022] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0023] like Figure 1-2 As shown, this embodiment of the invention provides a multi-functional integrated machining fixture for multi-stage stator blade tenons and connecting plates, including a fixture base 6, a guide rail 8 fixed on the fixture base 6, a positioning seat 5 for fixing the blade tenons, a hinge structure 7 for connecting the positioning seat 5 to the guide rail 8, a hook-shaped pressure plate 9 for pressing the blade 1, a ball head pin 10 fixed on the positioning seat 5 as a reference, and a contouring pressure plate 2 for mounting on the positioning seat 5. The connecting plate 3 to be processed is mounted on the contouring pressure plate 2. The positioning seat 5 is provided with multiple workstations for mounting the blade tenons side by side, and the contouring pressure plate 2 is machined with a composite cavity that is completely consistent with the bottom contour, angle, and spatial distribution of the blade tenon.

[0024] Ball head pin 10 serves as the reference for the machine tool to align the fixture coordinate origin and angle.

[0025] In some embodiments, the guide rail 8 includes a horizontal guide rail and a vertical guide rail, and the positioning seat 5 can be switched between the horizontal guide rail and the vertical guide rail.

[0026] In some embodiments, the number of hook-shaped pressure plates 9 is twice the number of blades, with each blade corresponding to two hook-shaped pressure plates 9.

[0027] In some embodiments, the positioning base 5 is provided with replaceable positioning pins 4 on its side. By replacing the positioning pins 4 with different diameters, it can be used to adapt to parts of different sizes.

[0028] In some embodiments, the contouring pressure plate 2 is a rectangular plate, and the composite cavity is consistent with the spatial distribution of multiple blades fixed on the positioning seat 5. The contouring pressure plate 2 is an independent rectangular plate, which, after being processed by a CNC machine tool, forms a composite cavity that is completely consistent with the bottom contour, angle, and spatial distribution of multiple qualified blade tenons. After the bottom surface of the blade tenon is processed, the hook-shaped pressure plate 9 is removed, the blade 1 is taken off, and the contouring pressure plate 2 is installed on the positioning seat 5. At this time, a brand-new processing reference surface with the same actual state as the bottom of the tenon is formed. Then, the connecting plate 3 to be processed is installed on the contouring pressure plate 2, and the connecting plate 3 to be processed is processed.

[0029] In some embodiments, a multi-functional integrated machining method for tenons and connecting plates of multi-stage stator blades is provided, the method utilizing a fixture as described in any of the preceding claims, including; S1. Use ball head pin 10 for initial alignment and fix the blade tenon on the positioning seat 5; S2. Machining the blade tenon; S3. Loosen and remove the hook-shaped pressure plate 9, remove the blade, and clean the machining debris. Install the contour pressure plate 2 onto the positioning seat 5, then place the connecting plate 3 on the upper surface of the contour pressure plate 2 and press it with the hook-shaped pressure plate 9; S4. Machining the outline and hole system of the connecting plate.

[0030] In some embodiments, the initial alignment using the ball head pin 10 includes tooling alignment by touching the ball head pin with the machine tool probe.

[0031] In some embodiments, fixing the blade tenon to the positioning seat 5 includes first placing the blade tenon into the work position of the positioning seat 5 in sequence, then installing the positioning pin 4, and finally pressing the bottom of the blade tenon with the hook-shaped pressure plate 9.

[0032] In some embodiments, the machining of the blade tenon includes sequentially machining the bottom arc groove, end face, and radial hole of the blade tenon.

[0033] In some embodiments, the processing method includes horizontal processing and vertical processing, and the conversion between horizontal processing and vertical processing is achieved by loosening the locking device of the hinge structure and rotating the positioning seat 90° on the guide rail.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A multi-functional integrated machining fixture for tenons and connecting plates of multi-unit stator blades, characterized in that, The system includes a fixture base, a guide rail fixed to the fixture base, a positioning seat for fixing the blade tenon, a hinge structure for connecting the positioning seat to the guide rail, a hook-shaped pressure plate for clamping the blade, a ball-head pin fixed to the positioning seat as a reference, and a contouring pressure plate for mounting on the positioning seat. The connecting plate to be processed is mounted on the contouring pressure plate. The positioning base is provided with multiple workstations for installing blade tenons side by side. The contouring plate is machined with a composite cavity that is completely consistent with the bottom contour, angle and spatial distribution of the blade tenon.

2. The multi-functional integrated machining fixture for the tenon and connecting plate of the multi-unit stator blade as described in claim 1, characterized in that, The guide rail includes a horizontal guide rail and a vertical guide rail, and the positioning seat can be switched between the horizontal guide rail and the vertical guide rail.

3. The multi-functional integrated machining fixture for the tenon and connecting plate of the multi-unit stator blade as described in claim 1, characterized in that, The number of hook-shaped pressure plates is twice the number of blades, with each blade corresponding to two hook-shaped pressure plates.

4. The multi-functional integrated machining fixture for the tenon and connecting plate of the multi-unit stator blade as described in claim 1, characterized in that, The positioning seat has a replaceable positioning pin on its side.

5. The multi-functional integrated machining fixture for the tenon and connecting plate of the multi-unit stator blade as described in claim 1, characterized in that, The contouring pressure plate is a rectangular plate, and the composite cavity is spatially distributed with the multiple blades fixed on the positioning seat.

6. A multi-functional integrated processing method for tenons and connecting plates of multi-unit stator blades, characterized in that, The method utilizes the clamp as described in any one of claims 1-5, including: S1. Use the ball head pin for initial alignment and fix the blade tenon on the positioning seat; S2. Machining the blade tenon; S3. Take out the processed blade tenon, install the contour plate on the positioning seat, and press the connecting plate onto the upper surface of the contour plate. S4. Machining the outline and hole system of the connecting plate.

7. The multi-functional integrated processing method for the tenon and connecting plate of the multi-stage stator blade according to claim 6, characterized in that, The initial alignment using ball joint pins includes aligning the tooling by touching the ball joint pins with the machine tool probe.

8. The multi-functional integrated processing method for the tenon and connecting plate of the multi-stage stator blade according to claim 6, characterized in that, The process of fixing the blade tenon to the positioning seat includes first placing the blade tenons into the positioning seat in sequence, then inserting the positioning pins, and finally pressing the bottom of the blade tenon with a hook-shaped pressure plate.

9. The multi-functional integrated processing method for the tenon and connecting plate of the multi-stage stator blade according to claim 6, characterized in that, The process of machining the blade tenon includes sequentially machining the bottom arc groove, end face, and radial hole of the blade tenon.

10. The multi-functional integrated processing method for the tenon and connecting plate of the multi-stage stator blade according to claim 6, characterized in that, The processing method includes horizontal processing and vertical processing. The conversion between horizontal processing and vertical processing is achieved by loosening the locking device of the hinge structure and rotating the positioning seat 90° on the guide rail.

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