A fixture and method for assisted polishing and grinding of simulated parts

Abstract

This invention proposes a fixture and method for assisted polishing and grinding of a simulated component. The fixture includes a circular ring and a simulation plate. The circular ring is used to simulate a ring-shaped fuel main and is installed inside the combustion chamber housing. The simulation plate is installed on the circular ring and has an arc-shaped edge whose shape matches the theoretical contour of the outer side of the bend on the fuel main. It also includes a positioning structure for determining the position of the circular ring within the combustion chamber housing. The method includes: S1, placing the circular ring with the simulation plate installed into the combustion chamber housing and positioning it; S2, inserting a 1mm thick feeler gauge into the gap between the arc-shaped edge of the simulation plate and the support on the combustion chamber housing; if the feeler gauge can be inserted smoothly, the gap is acceptable; S3, if the feeler gauge cannot be inserted smoothly in step S2, removing the pin, then removing the circular ring with the simulation plate, and polishing the support on the combustion chamber housing; repeating steps S1 to S2 until the feeler gauge can be inserted smoothly.

Description

Technical Field

[0001] This invention relates to the field of aero-engine manufacturing technology, and in particular to a fixture and method for assisted polishing and grinding of simulated parts. Background Technology

[0002] Combination Figure 1 As shown, after the support 101 is welded to the combustion chamber casing 100, the thickness of the support 101 needs to be controlled. Due to the assembly sequence in the process, the support 101 is welded to the combustion chamber casing 100 first. The fuel main pipe to be assembled later has multiple bends 102 connected to it. When fitting them together, the minimum distance between the outer contour of the bend 102 and the support 101 needs to be 1mm.

[0003] To ensure this minimum spacing, current assembly technology grinds the combustion chamber support 101 according to its thickness. However, this presents a problem: after welding, the position of support 101 may deviate slightly, and simple grinding will cause the support to exceed the minimum thickness deviation. Another issue is that the bend 102 is formed by bending and deforming using a mold, and the bend may shrink or spring back. This makes it impossible to guarantee a 1mm minimum spacing after assembly. The previous method was to install the fuel main pipe first and then measure, but installing the fuel main pipe is time-consuming and labor-intensive. If an error in the 1mm minimum spacing is found, time-consuming disassembly is required, delaying production.

[0004] How to grind the support 101 without actually assembling the fuel main pipe to ensure a minimum gap of 1mm is an urgent problem to be solved. Summary of the Invention

[0005] The main objective of this invention is to provide a fixture and method for assisted polishing and grinding of simulated parts, in order to solve the aforementioned technical problems.

[0006] To achieve the above objectives, on the one hand, the present invention proposes a fixture for assisted polishing and grinding of a simulated component, comprising a ring body and a simulation plate; the ring body is used to simulate the annular fuel main pipe and is installed inside the combustion chamber casing; the simulation plate is installed on the ring body, and the simulation plate is provided with an arc-shaped edge, the shape of which is consistent with the theoretical contour of the outer side of the bend on the fuel main pipe; it also includes a positioning structure for determining the position of the ring body inside the combustion chamber casing.

[0007] Preferably, the positioning structure includes a pin and a pin hole disposed on the outer circumferential surface of the annulus; the circumferential angle of the pin hole is consistent with the circumferential angle of the through hole on the combustion chamber casing; when the annulus is installed in the combustion chamber casing, the pin is inserted into the through hole of the combustion chamber casing, and the inner end of the pin extends inward and is inserted into the pin hole of the annulus.

[0008] Preferably, a bushing is embedded in the pin hole, and the bushing is fitted with the pin hole in a transition fit.

[0009] Preferably, the pin is a stepped shaft shape, and from the outer end to the inner end, it includes a gripping section, a limiting section, a first mating section, and a second mating section in sequence; the limiting section is used to abut against the outer wall of the combustion chamber casing; the first mating section is used to mate with the through hole of the combustion chamber casing; and the second mating section is used to mate with the pin hole on the annular body.

[0010] Preferably, the number of pin holes is ≥3, and the number of pins is the same as the number of pin holes.

[0011] Preferably, the simulation plate is connected to the annulus via a connecting seat; the connecting seat is an integral T-shaped structure consisting of a vertical plate and a bottom plate, and the bottom plate of the connecting seat is fixedly installed on the top surface of the annulus by screws and cylindrical pins; the simulation plate is provided with a screw through hole and two pin holes, and is fixedly connected to the vertical plate of the connecting seat by screws and cylindrical pins.

[0012] Preferably, a right-angle notch is provided at the bottom left corner of the simulation plate, and the right-angle notch is engaged with the bottom plate of the connecting seat.

[0013] Preferably, one edge of the arc-shaped side is provided with a chamfer.

[0014] Preferably, two handles are welded to the top surface of the annulus, and the two handles are arranged symmetrically at 180 degrees.

[0015] On the other hand, the present invention also proposes a method for assisted polishing and grinding of a simulated part, using the above-mentioned fixture, including the following steps:

[0016] S1. Place the ring with the simulation plate installed into the combustion chamber housing, and use a pin to insert it into the through hole of the combustion chamber housing, with the inner end of the pin extending inward and inserting into the pin hole of the ring to position the ring.

[0017] S2. Insert a 1mm thick feeler gauge into the gap between the arc edge of the simulation plate and the support on the combustion chamber casing; if the feeler gauge can be inserted smoothly, the gap is acceptable.

[0018] S3. In step S2, if the feeler gauge cannot be inserted smoothly, remove the pin, then remove the annular body with the simulation plate, and then polish the support on the combustion chamber casing; repeat steps S1 to S2 until the feeler gauge can be inserted smoothly.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0020] (1) In this invention, a circular ring is used to simulate the annular fuel main pipe and is installed inside the combustion chamber housing. The arc-shaped edge of the simulation plate mounted on the circular ring is used to simulate the outer contour of the bent pipe. When polishing the support on the combustion chamber housing, the circular ring with the simulation plate is first placed inside the combustion chamber housing and positioned by the positioning structure. A 1mm thick feeler gauge is inserted into the gap between the arc-shaped edge of the simulation plate and the support. If the feeler gauge can be inserted smoothly, the gap is acceptable and polishing is not required. If the feeler gauge cannot be inserted smoothly, the support needs to be polished. After polishing, the above operation is repeated until the feeler gauge can be inserted smoothly. Therefore, using the fixture provided by this invention, the support can be polished without actually assembling the fuel main pipe to control the thickness of the support and ensure a minimum gap of 1mm.

[0021] (2) In this invention, the positioning structure consists of a pin and a pin hole on the outer circumferential surface of the annulus. During positioning, the pin is inserted into the through hole of the combustion chamber casing, and the inner end of the pin extends inward and is inserted into the pin hole of the annulus to complete the positioning. This invention utilizes the existing through hole on the combustion chamber casing for positioning, resulting in a simple structure and accurate and convenient positioning. Attached Figure Description

[0022] 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. Obviously, 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.

[0023] Figure 1 A schematic diagram showing the minimum clearance between the support on the combustion chamber casing and the outer contour of the bend on the fuel main;

[0024] Figure 2 A schematic diagram of a fixture for assisted polishing and grinding of a simulated part provided by the present invention;

[0025] Figure 3 This is a schematic diagram of the simulation plate structure in this method;

[0026] Figure 4 for Figure 3 Sectional view of AA;

[0027] Figure 5 A top view of the clamp provided by the present invention installed inside the combustion chamber casing;

[0028] Figure 6 for Figure 5 BB section view.

[0029] Explanation of icon numbers:

[0030] 100. Combustion chamber housing; 101. Support; 102. Bend; 103. Through hole; 1. Circular ring; 1a. Pin hole; 2. Connecting seat; 3. Simulation plate; 3a. Arc edge; 3b. Screw through hole; 3c. Pin hole; 3d. Chamfer; 3e. Right angle notch; 4. Pin; 4a. Grip section; 4b. Limiting section; 4c. First mating section; 4d. Second mating section; 5. Bushing; 6. Handle. Detailed Implementation

[0031] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0033] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0034] Combination Figure 1 , Figure 6 As shown, a through hole 103 is provided on the combustion chamber casing 100. After the support 101 is welded to the combustion chamber casing 100, the thickness of the support 101 needs to be controlled. Due to the assembly sequence in the process, the support 101 is welded to the combustion chamber casing 100 first. The fuel main pipe is to be assembled later. The fuel main pipe is connected to multiple bends 102. When fitting, the minimum distance between the outer contour of the bend 102 and the support 101 needs to be 1mm.

[0035] Combination Figure 2 , Figure 3As shown, this embodiment proposes a fixture for assisted polishing of a simulated component, including an annular body 1 and a simulation plate 3; the annular body 1 is used to simulate a ring-shaped fuel main pipe and is installed inside the combustion chamber casing 100; the simulation plate 3 is installed on the annular body 1, and the simulation plate 3 is provided with an arc-shaped edge 3a, the shape of which is consistent with the theoretical contour of the outer side of the bend 102 on the fuel main pipe; it also includes a positioning structure for determining the position of the annular body 1 inside the combustion chamber casing 100.

[0036] Combination Figure 2 , Figure 6 As shown, in this embodiment, the positioning structure includes a pin 4 and a pin hole 1a disposed on the outer circumferential surface of the annular body 1; the circumferential angle of the pin hole 1a is consistent with the circumferential angle of the through hole 103 on the combustion chamber casing 100; when the annular body 1 is installed in the combustion chamber casing 100, the pin 4 is inserted into the through hole 103 of the combustion chamber casing 100, and the inner end of the pin 4 extends inward and is inserted into the pin hole 1a of the annular body 1.

[0037] Furthermore, to prevent the pin 4 from wearing down the pin hole 1a during repeated assembly processes, thus reducing positioning accuracy, a bushing 5 is embedded in the pin hole 1a. The bushing 5 has a transition fit with the pin hole 1a. The purpose of the bushing 5 is to protect the pin hole 1a and prevent it from wearing down.

[0038] Combination Figure 2 As shown, the pin 4 is a stepped shaft shape, comprising, from the outer end to the inner end, a gripping section 4a, a limiting section 4b, a first mating section 4c, and a second mating section 4d. The gripping section 4a facilitates gripping by the operator during operation. The limiting section 4b abuts against the outer wall of the combustion chamber housing 100, limiting the insertion depth of the pin 4. The first mating section 4c mates with the through hole 103 of the combustion chamber housing 100; the second mating section 4d mates with the pin hole 1a on the annular body 1.

[0039] To ensure positioning accuracy, the number of pin holes 1a is ≥3, and the number of pins 4 is the same as the number of pin holes 1a. In this embodiment, the number of pin holes is 5, corresponding to 5 pins 4.

[0040] Combination Figure 2As shown, to facilitate the installation of the simulation plate 3, the simulation plate 3 is connected to the annular body 1 via a connecting seat 2. The connecting seat 2 is an integrated T-shaped structure consisting of a vertical plate and a bottom plate. The bottom plate of the connecting seat 2 is fixedly installed on the top surface of the annular body 1 by screws and cylindrical pins. The simulation plate 3 is provided with one screw through hole 3b and two pin holes 3c, and is fixedly connected to the vertical plate of the connecting seat 2 by screws and cylindrical pins. The simulation plate 3 and the connecting seat 2 form a detachable structure, and the assembly and disassembly of the simulation plate 3 can be carried out by selecting a suitable simulation plate 3 according to different bend pipe 102 structures.

[0041] Combination Figure 3 As shown, a right-angle notch 3e is provided at the bottom left corner of the simulation plate 3, and the right-angle notch 3e is snapped into the base plate of the connecting seat 2. When the simulation plate 3 is assembled onto the connecting seat 2, the right-angle notch 3e snaps into the base plate of the connecting seat 2 to provide initial positioning. Then, the simulation plate 3 is fixedly connected to the upright plate of the connecting seat 2 using the screw through holes 3b and two pin holes 3c on the simulation plate 3.

[0042] Combination Figure 4 As shown, a chamfer 3d is provided along one edge of the arc-shaped edge 3a. The purpose of providing the chamfer 3d is to reduce the thickness t of the arc-shaped edge 3a, making the arc-shaped edge 3a closer to the outer contour of the bend 102.

[0043] Combination Figure 2 As shown, two handles 6 are welded to the top surface of the annular body 1, and the two handles 6 are symmetrically arranged at 180 degrees. The purpose of setting the handles 6 is to facilitate the insertion of the annular body 1 with the simulation plate 3 into the combustion chamber housing 100.

[0044] Combination Figure 5 , Figure 6 As shown, on the other hand, a method for assisted polishing and grinding of a simulated part was also proposed, using the above-mentioned fixture, including the following steps:

[0045] S1. Place the annular body 1 with the simulation plate 3 installed into the combustion chamber housing 100, and use the pin 4 to insert it into the through hole 103 of the combustion chamber housing 100, and the inner end of the pin 4 extends inward and inserts into the pin hole 1a of the annular body 1 to position the annular body 1.

[0046] S2. Insert a 1mm thick feeler gauge into the gap between the arc-shaped edge 3a of the simulation plate 3 and the support 101 on the combustion chamber casing 100; if the feeler gauge can be inserted smoothly, the gap is qualified.

[0047] S3. In step S2, if the feeler gauge cannot be inserted smoothly, remove the pin 4, then remove the annular body 1 with the simulation plate 3, and then polish the support 101 on the combustion chamber casing 100; repeat steps S1 to S2 until the feeler gauge can be inserted smoothly.

[0048] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for assisted polishing and grinding of a simulated part, characterized in that, The fixture used includes a toroidal body (1) and a simulation plate (3); The annular body (1) is used to simulate the annular fuel manifold and is installed inside the combustion chamber casing (100); The simulation plate (3) is mounted on the annulus (1), and the simulation plate (3) is provided with an arc edge (3a), the shape of which is consistent with the theoretical profile of the outside of the bend (102) on the fuel main pipe; It also includes a positioning structure for determining the position of the annulus (1) within the combustion chamber casing (100); The method includes the following steps: S1. Place the annular body (1) with the simulation plate (3) installed into the combustion chamber housing (100), and use the pin (4) to insert it into the through hole (103) of the combustion chamber housing (100), and the inner end of the pin (4) extends inward and inserts into the pin hole (1a) of the annular body (1) to position the annular body (1); S2. Insert a 1mm thick feeler gauge into the gap between the arc-shaped edge (3a) of the simulation plate (3) and the support (101) on the combustion chamber casing (100); if the feeler gauge can be inserted smoothly, the gap is qualified. S3. In step S2, if the feeler gauge cannot be inserted smoothly, remove the pin (4), then take out the annulus (1) with the simulation plate (3), and polish the support (101) on the combustion chamber casing (100); repeat steps S1 to S2 until the feeler gauge can be inserted smoothly.

2. The method for assisted polishing and grinding of a simulated part as described in claim 1, characterized in that, The positioning structure includes a pin (4) and a pin hole (1a) on the outer circumferential surface of the annular body (1); the circumferential angle of the pin hole (1a) is consistent with the circumferential angle of the through hole (103) on the combustion chamber casing (100); when the annular body (1) is installed in the combustion chamber casing (100), the pin (4) is inserted into the through hole (103) of the combustion chamber casing (100), and the inner end of the pin (4) extends inward and is inserted into the pin hole (1a) of the annular body (1).

3. The method for assisted polishing and grinding of a simulated part as described in claim 2, characterized in that, A bushing (5) is embedded in the pin hole (1a), and the bushing (5) is in transition fit with the pin hole (1a).

4. The method for assisted polishing and grinding of a simulated part as described in claim 2, characterized in that, The pin (4) is a stepped shaft shape, and from the outer end to the inner end, it includes a gripping section (4a), a limiting section (4b), a first mating section (4c), and a second mating section (4d). The limiting section (4b) is used to abut against the outer wall of the combustion chamber casing (100); The first mating section (4c) is used to mate with the through hole (103) of the combustion chamber casing (100); The second mating section (4d) is used to mate with the pin hole (1a) on the annulus (1).

5. The method for assisted polishing and grinding of a simulated part as described in claim 2, characterized in that, The number of the pin holes (1a) is ≥3, and the number of the pins (4) is the same as the number of the pin holes (1a).

6. The method for assisted polishing and grinding of a simulated part as described in claim 1, characterized in that, The simulation plate (3) and the annulus (1) are connected by a connecting seat (2); The connecting seat (2) is an integral T-shaped structure consisting of a vertical plate and a bottom plate. The bottom plate of the connecting seat (2) is fixedly installed on the top surface of the ring (1) by screws and cylindrical pins. The simulation plate (3) is provided with a screw through hole (3b) and two pin holes (3c), and is fixedly connected to the upright plate of the connecting seat (2) by screws and cylindrical pins.

7. The method for assisted polishing and grinding of a simulated part as described in claim 6, characterized in that, A right-angle notch (3e) is provided at the bottom left corner of the simulation plate (3), and the right-angle notch (3e) is snapped onto the bottom plate of the connecting seat (2).

8. The method for assisted polishing and grinding of a simulated part as described in claim 1, characterized in that, One of the edges of the arc-shaped edge (3a) is provided with a chamfer (3d).

9. The method for assisted polishing and grinding of a simulated part as described in claim 1, characterized in that, Two handles (6) are welded to the top surface of the annulus (1), and the two handles (6) are arranged symmetrically at 180 degrees.

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