An aero-engine seal piece mounting hole processing tool

Abstract

The application discloses an aero-engine sealing sheet mounting hole processing tool, and belongs to the technical field of aero-engine part processing. The tool mainly comprises a base, a positioning device, a pressing device, a flexible positioning support device and a vibration sensor. The innovation lies in that the positioning device comprises a ball head center, the pressing device comprises a pressing bolt arranged opposite to the ball head center, and the ball head center and the pressing bolt form a reverse centering structure, thereby realizing the unity of the part positioning reference and the processing clamping reference. The flexible positioning support device can adaptively support the back surface of the sealing sheet and inhibit processing deformation. The vibration sensor is used for monitoring the tool state in real time. Through the double-station design, the tool can complete the processing of two processes through one-time clamping, effectively solves the problems of inaccurate positioning, easy deformation and low efficiency in the sealing sheet processing, and significantly improves the processing precision, the qualified rate and the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of aero-engine component processing technology, and in particular to a tooling for machining mounting holes for aero-engine sealing plates. Background Technology

[0002] As a core sealing component of the engine exhaust nozzle, the quality of the mounting hole machining of the sealing plate directly affects the engine's sealing performance and operational reliability. Currently, the machining of this part faces several major technical challenges: First, because the form and position tolerance datum of the mounting hole is set on the cast surface, and the cast surface itself has inherent defects such as poor consistency, traditional fixtures struggle to achieve precise positioning. Second, existing fixtures generally suffer from inconsistencies between the clamping datum and the part's design datum, further introducing positioning errors and severely impacting machining accuracy. Third, the high hardness of the sealing plate material generates significant cutting forces during machining, accelerating tool wear and easily causing part deformation, resulting in a low yield rate. Furthermore, existing machining methods typically require two independent four-axis machining processes to complete two different types of mounting holes, necessitating re-clamping and positioning between processes, leading to low machining efficiency and difficulty in meeting the demands of mass production. Therefore, developing a dedicated tooling that can unify the datum, suppress deformation, and improve efficiency has become an urgent technical problem to be solved in this field. Summary of the Invention

[0003] The purpose of this invention is to provide a tooling for machining mounting holes for aero-engine sealing plates. By designing a reverse-top positioning structure, the positioning point of the ball head tip is precisely aligned with the design datum of the sealing plate, fundamentally solving the industry problem of inconsistent clamping datum and design datum.

[0004] This invention is achieved using the following technical solution: a machining fixture for mounting holes of aero-engine sealing plates, characterized in that it includes a base; a positioning device disposed on the base for positioning the sealing plate; a clamping device for clamping the sealing plate; the positioning device includes multiple positioning pins, and the clamping device includes a ball head tip and a tightening bolt disposed opposite to the ball head tip, forming a reverse positioning structure; it also includes a flexible positioning support device disposed on the base for adaptively supporting the back of the sealing plate; and a vibration sensor disposed on the fixture for real-time monitoring of vibration signals during the machining process.

[0005] Furthermore, the base has two clamping surfaces, one on the front and one on the back, for clamping the sealing sheets of step one and step two, respectively.

[0006] Furthermore, the positioning device includes a positioning pin and a positioning pin, wherein the positioning pin is used for the initial positioning of the clamping in step one and the positioning pin is used for the positioning of the clamping in step two, and both the positioning pin and the positioning pin are connected to the holes on the base by interference fit.

[0007] Furthermore, the ball head tip and the tightening bolt opposite to the ball head tip are used for clamping in step one, and step two uses a clamping bolt for direct clamping. Both the clamping bolt and the tightening bolt are threaded to the base.

[0008] Furthermore, the ball tip is mounted via a ball tip bracket, and the ball tip and the mounting hole on the ball tip bracket are connected by an interference fit. The ball tip bracket is connected to the base via a ball tip bracket locating pin and a ball tip bracket rhomboid locating pin. The ball tip bracket locating pin and the ball tip bracket rhomboid locating pin are interference-fitted with the hole in the base, and clearance-fitted with the hole in the ball tip bracket. They are then tightened and fixed by a ball tip bracket clamping bolt.

[0009] Furthermore, the flexible positioning support device is built into the center of the sealing plate installation position of the base and is connected to the base through an adjustable screw or hydraulic mechanism, which can adapt to the irregularity of the casting surface on the back of the sealing plate.

[0010] Furthermore, the position of the ball head tip coincides with the design reference point of the sealing sheet, thereby unifying the part positioning reference and clamping reference.

[0011] The invention provides a tooling for machining mounting holes for aero-engine sealing plates, which has the following advantages: This invention optimizes the clamping and positioning method, integrates a vibration signal detection system, designs a flexible support unit, and adopts a dual-station processing layout. It achieves precise control over the deformation of parts during processing from multiple dimensions, ultimately significantly improving machine tool processing efficiency and the qualification rate of finished parts, and providing reliable technical support for the high-quality and high-efficiency production of sealing sheets.

[0012] Specifically, this invention fundamentally solves the industry problem of inconsistent reference standards, achieving high-precision positioning. Through an innovative reverse-top positioning structure design, where the ball head tip and the tightening bolt work in opposite directions in a coordinated manner, the positioning point of the tooling precisely coincides with the design reference of the sealing plate. This eliminates systematic errors caused by inconsistencies between the clamping reference and the design reference, providing a fundamental guarantee for high-precision machining.

[0013] It effectively suppresses machining deformation and significantly improves the part qualification rate. The built-in flexible positioning support device can adapt to the irregularity of the casting surface on the back of the sealing sheet, providing active and close-fitting rigid support for the part during the machining process. It works in conjunction with the clamping force to effectively resist the cutting force and control the amount of machining deformation to a minimum.

[0014] Intelligent monitoring and quality early warning of the machining process have been achieved. The vibration sensor on the ball head center support can collect machining vibration signals in real time. By analyzing the vibration characteristic curve, the wear status of the tool can be judged online, and an early warning can be given in time before the tool deteriorates, avoiding batch quality defects caused by excessive tool wear. This realizes an upgrade in quality control from passive detection to proactive prevention.

[0015] This significantly improves production efficiency and optimizes the processing flow. The tooling adopts a double-sided, double-station design, which can complete the processing of the two types of mounting holes in the middle and tail of the sealing sheet in one clamping, avoiding repeated clamping and positioning between processes. Combined with the integrated processing program, it is very suitable for the needs of mass production. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the cross section along the CC direction; Figure 3 for Figure 1 Diagram of direction A in the middle; Figure 4 for Figure 3 Diagram of direction B in the middle; In the figure, 1-first positioning pin, 2-flexible positioning support device, 3-tightening bolt, 4-ball head support positioning pin, 5-ball head support rhomboid positioning pin, 6-ball head support clamping bolt, 7-vibration sensor, 8-ball head support, 9-ball head, 10-module mounting positioning pin, 11-four-axis mounting plate, 12-module mounting bolt, 13-clamping bolt, 14-second positioning pin, 15-base. Detailed Implementation

[0018] 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.

[0019] 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. Example

[0020] like Figure 1-4 As shown, this embodiment provides a tooling for machining mounting holes for aero-engine sealing plates, mainly composed of a first positioning pin 1, a flexible positioning support device 2, a tightening bolt 3, a ball head support positioning pin 4, a ball head support rhomboid positioning pin 5, a ball head support clamping bolt 6, a vibration sensor 7, a ball head support 8, a ball head 9, a module mounting positioning pin 10, a four-axis mounting plate 11, a module mounting bolt 12, a clamping bolt 13, a second positioning pin 14, and a base 15.

[0021] Specifically, the four-axis mounting plate 11 and the base 15 are precisely positioned by modular mounting positioning pins 10. The modular mounting positioning pins 10 and the positioning holes on the base 15 are interference-fitted to ensure the alignment accuracy between the mounting plate and the base. The four-axis mounting plate 11 is then fixedly connected to the base 15 by modular mounting bolts 12 to form a rigid basic frame for the tooling. The base 15 is clamped on both sides for step one and step two, respectively. There are four first positioning pins 1, which are interference-fitted with the holes on the base 15 and are used for initial positioning of the sealing plate parts during step one clamping. Similarly, there are four second positioning pins 14, which are also interference-fitted with the holes on the base 15 and are used for positioning during step two clamping. The ball head tip 9 and the mounting holes on the ball head tip support 8 are connected by an interference fit to form a reverse positioning structure. The ball head tip support 8 is connected to the base 15 by ball head tip support positioning pins 4 and 5. The ball head tip support positioning pins 4 and 5 are interference-fitted with the holes in the base 15, while they are clearance-fitted with the holes in the ball head tip support 8 to achieve fine-tuning and centering. There are four ball head tip support clamping bolts 6 to clamp and fix the ball head tip support 8 to the base 15. A vibration sensor 7 is installed above the ball head tip support 8 to collect processing vibration signals in real time. The flexible positioning support device 2 is built into the center of the sealing sheet installation position and is connected to the base 15 through an adjustable screw or hydraulic mechanism. It can adapt to the irregularity of the casting surface on the back of the sealing sheet. There are 4 tightening bolts 3, which pass through the threaded holes on the base 15 and are used to apply clamping force from the back of the part during the first clamping step. The tightening bolts 3 are set at the position opposite to the ball head tip 9 and cooperate with the ball head tip 9 to achieve clamping. There are 2 clamping bolts 13, which are also connected through the threaded holes on the base 15 and are used for clamping in the second clamping step.

[0022] In its working principle, this fixture achieves efficient machining through a dual-station design. Step one, the clamping process, is as follows: First, the sealing plate part is positioned using the first locating pin 1, ensuring the machined surface of the part contacts the ball head tip 9. The ball head tip 9 serves as a positioning reference point, coinciding with the part's design reference, thus resolving the issue of inconsistent references. Then, the tightening bolt 3 is tightened, applying uniform pressure from the back of the part. Simultaneously, the flexible positioning support device 2 is adjusted to tightly fit the part's casting surface, providing adaptive support to suppress cutting deformation. During the machining of the central mounting hole, the vibration sensor 7 monitors the part's vibration in real time. By analyzing the vibration signal characteristic curve, online warnings of tool wear are provided. If abnormal vibration is detected, the system prompts for tool replacement to prevent deterioration of machining quality. After completing step one, the part is disassembled and flipped to the other side of the fixture for step two clamping: the part is positioned using the second locating pin 14 and tightened by the clamping bolt 13, and the tail mounting hole is machined. The dual-station layout allows two processes to be completed in a single clamping operation. By developing an integrated machining program, continuous machining is achieved, significantly improving efficiency.

[0023] For sealing sheets of different specifications, the tooling supports quick changeover, with the positioning module on base 15 being replaceable for adaptation. Throughout the process, the reverse positioning structure ensures consistent clamping force and positioning accuracy, the flexible support unit effectively controls deformation, and the vibration monitoring system guarantees stability.

[0024] The above embodiments describe the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Modifications and variations made by those skilled in the art without departing from the spirit and scope of the invention should be within the protection scope of the appended claims.

Claims

1. A tooling for machining mounting holes for aero-engine sealing plates, characterized in that, The device includes a base (15); a positioning device, which is set on the base (15) for positioning the sealing sheet; a clamping device for clamping the sealing sheet; the positioning device includes multiple positioning pins, and the clamping device includes a ball head tip (9) and a top bolt (3) arranged opposite to the ball head tip (9) to form a reverse top positioning structure; it also includes a flexible positioning support device (2), which is set on the base (15) and is used to adaptively support the back of the sealing sheet; and a vibration sensor (7), which is set on the tooling and is used to monitor the vibration signal during the processing in real time; the base (15) has two clamping surfaces, one on the front and one on the back; the flexible positioning support device (2) is built into the center of the sealing sheet installation position on the base (15) and is connected to the base (15) by an adjustable screw or a hydraulic mechanism, which can adapt to the irregularity of the casting surface on the back of the sealing sheet; the setting position of the ball head tip (9) coincides with the design reference point of the sealing sheet, so as to realize the unification of the part positioning reference and the clamping reference; the vibration sensor (7) is installed above the ball head tip bracket (8) for real-time acquisition of processing vibration signals.

2. The fixture for machining mounting holes for aero-engine sealing plates according to claim 1, characterized in that, The two clamping surfaces of the base (15) are used for clamping the sealing plates of step one and step two, respectively.

3. The machining fixture for mounting holes of aero-engine sealing plates according to claim 2, characterized in that, The positioning device includes a first positioning pin (1) and a second positioning pin (14), wherein the first positioning pin (1) is used for the initial positioning of the clamping in step one, and the second positioning pin (14) is used for the positioning of the clamping in step two. Both the first positioning pin (1) and the second positioning pin (14) are connected to the hole on the base (15) by interference fit.

4. The tooling for machining mounting holes for aero-engine sealing plates according to claim 2, characterized in that, The ball tip (9) and the top bolt (3) opposite to the ball tip (9) are used for clamping in step one. Step two uses the clamping bolt (13) for direct clamping. The clamping bolt (13) and the top bolt (3) are both threaded to the base (15).

5. The tooling for machining mounting holes for aero-engine sealing plates according to claim 1, characterized in that, The ball tip (9) is installed through the ball tip bracket (8), and the ball tip (9) and the mounting hole on the ball tip bracket (8) are connected by an interference fit; the ball tip bracket (8) is connected to the base (15) through the ball tip bracket positioning pin (4) and the ball tip bracket diamond positioning pin (5), wherein the ball tip bracket positioning pin (4) and the ball tip bracket diamond positioning pin (5) are connected by an interference fit with the hole of the base (15), and by a clearance fit with the hole of the ball tip bracket (8), and are pressed and fixed by the ball tip bracket clamping bolt (6).

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