Combustion chamber annular thin-walled part and machining method thereof

Abstract

The present application belongs to the technical field of mechanical processing, and particularly relates to a combustion chamber annular thin-wall part and a processing method thereof, which comprises the following steps: forming a wire passing hole for a cutting line to pass through on a cylindrical bar, the axis of the wire passing hole being parallel to the axis of the bar; cutting the cylindrical bar into a pipe material by using the cutting line, the inner wall of the pipe material having a processing allowance with a contour line of a target part to form an edge part for chucking of a machine tool chuck; chucking the edge part of the pipe material by using the machine tool chuck, and turning an outer contour surface of the target part from the outer diameter to the inner diameter of the pipe material; installing a circular ring-shaped tooling in the middle of the outer contour surface, and then turning an inner contour surface of the target part by using the machine tool chuck to chuck the tooling; removing the tooling, and polishing the tooling installation position of the pipe material to form the target part. By the above method, the target part body is only made by using machining, the process is simple, the part has no plastic deformation, and the part yield can be improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical processing, and particularly relates to a combustion chamber annular thin-walled part and a processing method thereof. BACKGROUND

[0002] At present, with the increasing requirements of various aircrafts, propellers and fuel tanks on the mobility, load capacity and maximum capacity, the structure also puts forward higher requirements on light weight and high strength.

[0003] In the traditional processing technology of the arc-shaped thin-walled part of the combustion chamber, a spinning process is mostly used for manufacturing, but this process needs to manufacture a mold in advance, has high cost, complex process and long cycle; this process is suitable for the processing of batch products and cannot be applied to the processing of single products; in the spinning process, plastic deformation in the spinning process will reduce the mechanical properties of the part and affect the service life of the part.

[0004] For the processing of the arc-shaped thin-walled part of the combustion chamber, the part itself has large size, thin wall thickness and poor rigidity, and the vibration of the tool is prone to occur during machining, the precision and surface roughness cannot be guaranteed, and the yield is low; at the same time, the clamping of the part machining surface is also difficult. SUMMARY

[0005] The present application aims to solve at least one problem in the background art, and provides a combustion chamber annular thin-walled part and a processing method thereof.

[0006] To achieve the above-mentioned purpose, a processing method of a combustion chamber annular thin-walled part of the present application comprises:

[0007] forming a wire passing hole for the cutting line to pass through on the cylindrical bar stock, the axis of the wire passing hole being parallel to the axis of the bar stock;

[0008] cutting the cylindrical bar stock into a pipe material by using the cutting line, the inner wall of the pipe material having a machining allowance with the target part contour line to form an edge part for chucking of a machine tool chuck;

[0009] chucking the edge part of the pipe material by using the machine tool chuck, and turning the outer contour surface of the target part from the outer diameter to the inner diameter direction of the pipe material;

[0010] installing a circular ring-shaped tool in the middle of the outer contour surface, and then turning the inner contour surface of the target part;

[0011] removing the tool, and polishing the tool installation position on the pipe material to form the target part.

[0012] Preferably, the installation of the circular ring-shaped tool in the middle of the outer contour surface comprises:

[0013] Weld the tooling together with the outer profile surface;

[0014] Clamp the edge portion of the pipe blank, and turn the tooling to make the tooling coaxial with the pipe blank.

[0015] Preferably, the tooling is welded together with the outer profile surface by means of argon arc spot welding.

[0016] Preferably, the welding points of the tooling and the outer profile surface are at least 4 evenly arranged welding points.

[0017] Preferably, the outer profile surface and the inner profile surface are arc surfaces.

[0018] Preferably, when turning the outer profile surface and the inner profile surface of the target part, the pipe blank is first rough machined, and then the pipe blank is finished machined.

[0019] Preferably, the inner profile surface of the target part is turned from the outer diameter to the inner diameter direction of the pipe blank.

[0020] Preferably, the protruding side of the target part is the outer profile surface.

[0021] Preferably, the recessed side of the target part is the inner profile surface.

[0022] To achieve the above-mentioned purposes, the present application provides a combustion chamber annular thin-walled part obtained by using the machining method of any one of the above-mentioned combustion chamber annular thin-walled parts.

[0023] Based on this, the beneficial effects of the present application are:

[0024] 1. By the scheme of the present application, the part itself only uses one machining process for manufacturing, the process is simple, and the machining period is significantly shortened; at the same time, no mold is needed, the machining cost can be reduced, there is no plastic deformation, the mechanical properties of the part are not affected, and the service life of the part is increased.

[0025] 2. By the scheme of the present application, when turning the outer profile surface of the part, the inner profile has a blank allowance, the overall rigidity of the part is large, and the vibration of the cutter is reduced; when turning the inner profile surface of the part, the part is clamped by installing a circular ring type tooling, so that the stress of the part during machining is as uniform as possible, and the vibration of the cutter is also reduced.

[0026] 3. By the scheme of the present application, the tooling is installed by means of argon arc spot welding, which is simple and reliable as a whole, and the size of the tooling can be adjusted according to the size or arc of the target part without the need to redesign the process flow. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1a flow chart of a processing method of a combustion chamber annular thin-walled part according to an embodiment of the present application;

[0028] Figures 2-7 a schematic diagram of a processing disassembly of a target part according to an embodiment of the present application;

[0029] Figure 8 a schematic diagram of a structure of a target part according to an embodiment of the present application;

[0030] BRIEF DESCRIPTION OF DRAWINGS: bar 10, wire hole 101, target part contour line 102, tube 20, outer contour surface 201, inner contour surface 202, tooling 30. DETAILED DESCRIPTION

[0031] The present application will now be discussed with reference to example embodiments. It should be appreciated that the discussed embodiments are merely for purposes of illustration and are not intended to limit the scope of the application in any way.

[0032] As used herein, the term "includes" and its variants are to be read to be synonymous with "comprises" and its variants. The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted to mean "at least one embodiment."

[0033] Figure 1 a flow chart of a processing method of a combustion chamber annular thin-walled part according to an embodiment of the present application, Figures 2-7 a schematic diagram of a processing disassembly of a target part according to an embodiment of the present application, as Figures 1-7 shown, a processing method of a combustion chamber annular thin-walled part according to an embodiment of the present application, comprises:

[0034] S01: forming a wire hole 101 for a cutting line to pass through on a cylindrical bar 10, an axis of the wire hole 101 being parallel to an axis of the bar 10;

[0035] S02: cutting the cylindrical bar 10 into a tube 20 using the cutting line, the tube 20 having a machining allowance between an inner wall of the tube 20 and a target part contour line 102 to form an edge portion for chucking of a machine tool chuck;

[0036] S03: machining an outer contour surface 201 of a target part from an outer diameter to an inner diameter of the tube 20 using the machine tool chuck to chuck the edge portion of the tube 20;

[0037] S04: chucking a circular ring-shaped tooling 30 in a middle portion of the outer contour surface 201 to machine an inner contour surface 202 of the target part;

[0038] S05: removing the tooling 30, polishing the tooling 30 installation position on the pipe material 20 to form the target part.

[0039] In the prior art, the combustion chamber arc wall is usually processed by a spinning process, but under the process, a mold needs to be made in advance, which increases the manufacturing cost and the cycle of the process, and the process is suitable for the processing of batch products, and if only single product is processed, the investment cost is high and the cycle is long, and when the spinning part is processed, plastic deformation of the part occurs, which reduces the mechanical properties of the part and affects the service life.

[0040] The above method of the present application only uses one type of machining method for the target part body, so that there is no plastic deformation in the part reprocessing process, which does not affect the mechanical properties of the product, and no mold needs to be made in advance, saving cost, the overall process is simple, and the processing cycle can be significantly shortened.

[0041] Further, for the processing of the combustion chamber annular thin wall, the part itself has large size, thin wall thickness and poor rigidity, and vibration of the tool occurs during processing, so that the precision and surface roughness of the processed part cannot be guaranteed, resulting in low part yield, and the clamping of the part processing surface is also difficult because the part processing surface is an arc surface.

[0042] However, when the outer contour surface 201 of the machined part is machined, the inner contour surface 202 is not machined, and has a blank allowance, so that the part has large rigidity, and when the inner contour surface 202 of the part is machined, the outer contour surface 201 of the part is clamped by the tooling 30, so that the part is uniformly stressed during machining, which can effectively reduce the vibration of the tool and improve the part yield.

[0043] Further, Figures 2-7 As shown in the exploded view of the part processing of the present application, Figure 2 、 3 In steps S01 and S02:

[0044] The bar stock 10 is cylindrical, Figures 2-7 is a cross-sectional view of the cylindrical axis direction of the bar stock 10, and the target part contour line 102 is provided on the cross-sectional surface of the bar stock 10. The target part contour line 102 is a hypothetical contour line for convenient understanding and description.

[0045] A wire hole 101 parallel to the axis of the bar stock 10 is formed on the bar stock 10, and the bar stock 10 can be cut along the wire hole 101 by a wire cutting process, so that the central region of the bar stock 10 forms a cylindrical through hole, and the bar stock 10 becomes a pipe material 20.

[0046] At the same time, when the wire hole 101 is arranged, a certain spacing exists between the target part contour line 102, so that the inner wall of the pipe 20 has a machining allowance with the target part contour line 102, facilitating clamping of the lathe chuck in subsequent operations.

[0047] Further, as shown in step S03: Figure 4

[0048] The lathe chuck extends into the center through hole of the circular pipe 20 to clamp the inner wall of the pipe 20, realizing fixation of the pipe 20. The size and shape parameters of the circular arc required by the target part are programmed and processed on the numerical control lathe. The pipe 20 is placed in the numerical control lathe, so that the numerical control lathe can automatically cut the pipe 20 to complete the processing of the outer contour surface 201 of the pipe 20.

[0049] During numerical control lathe processing, part of the edge of the inner wall of the pipe 20 is clamped by the lathe chuck. When processing the outer contour surface 201, the clamped part needs to be avoided to ensure that the pipe 20 can be clamped by the lathe chuck at all times during processing, and the reserved clamped part can also be clamped to the pipe 20 in subsequent operations, avoiding direct clamping to the target part and damaging the target part.

[0050] At the same time, when processing the outer contour surface 201, the processing sequence of the numerical control lathe needs to be from the outer diameter to the inner diameter of the pipe 20, which can improve the processing precision of the outer contour surface 201.

[0051] In addition, when processing the outer contour surface 201, the principle of rough turning first and then fine turning should be followed. Most of the blank allowance is removed first, and then the outer contour surface 201 is finely removed to ensure the required precision and surface quality of the outer contour surface 201.

[0052] Further, as shown in step S04: Figure 5

[0053] The circular tooling 30 is installed to the middle part of the outer contour surface 201 and is coaxial with the pipe 20. During installation, the clamped part of the inner wall of the pipe 20 is clamped by the lathe chuck to fix the pipe 20, and then the tooling 30 is installed with the outer contour surface 201.

[0054] At the same time, the combination of the circular tooling 30 and the circular pipe 20 improves the rigidity of the pipe 20, making the processing of the inner contour surface 202 more stable and reducing the vibration of the cutter.

[0055] Further, the step of installing the tooling 30 to the outer contour surface 201 of the pipe 20 includes:

[0056] ​​S401: welding the tooling 30 and the outer contour surface 201 together;

[0057] S402 : Clamp the edge of the pipe 20 , and lathe the tool 30 to make the tool 30 coaxial with the pipe 20 .

[0058] As for the outer contour surface 201 of the pipe material 20, its arc-shaped surface is not conducive to clamping, and the clamping problem needs to be solved through design work.

[0059] In step S401 of the present invention, the tooling 30 and the outer contour surface 201 are welded together by argon arc spot welding. At the same time, it is ensured that the welding points between the tooling 30 and the outer contour surface 201 are at least 4 evenly arranged welding points, so that the tooling 30 and the outer contour surface 201 are firmly installed and not easy to fall off, thereby ensuring smooth processing.

[0060] In step S402, after the tooling 30 and the outer contour surface 201 are installed, the coaxiality between the two is not high. When the subsequent inner contour surface 202 is processed, the machine tool chuck needs to be clamped on the inner circle of the tooling 30. If the coaxiality between the tooling 30 and the tube material 20 is not high, the processing position of the inner contour surface 202 will be offset, resulting in different thicknesses between the outer contour surface 201 and the inner contour surface 202, or the target part cannot be formed, affecting the target part yield.

[0061] like Figure 6 As shown, when processing the inner contour surface 202, the radian and size parameters required for processing the inner contour surface 202 are also pre-programmed on the CNC lathe. By clamping the tooling 30, the tube material 20 is placed in the CNC lathe, and the CNC lathe automatically processes to complete the processing of the inner contour surface 202.

[0062] At the same time, the inner contour surface 202 is also processed from the outer diameter to the inner diameter of the tube material 20. During processing, the remaining material at the clamping position of the inner wall of the tube material 20 reserved in the previous steps is also removed.

[0063] Furthermore, if Figure 7 As shown, in step S05:

[0064] The tooling 30 is cut off from the outer contour surface 201 of the tube material 20 , and the spot welding portion of the tube material 20 is polished to finally obtain the target part and complete the production.

[0065] The above method is suitable for the production of thin-walled parts with small thickness and curved surfaces and is widely applicable.

[0066] Furthermore, Figure 8 A schematic diagram schematically shows the structure of a target part in one embodiment of the present invention, as shown in FIG. Figure 8The application also provides a combustion chamber annular thin-wall part obtained by the machining method.

[0067] The outer profile surface 201 and the inner profile surface 202 of the target part are arc-shaped, and the outer profile surface 201 is the convex surface of the target part, and the inner profile surface 202 is the concave surface of the target part.

[0068] Therefore, by the above steps, the target part body of the application is only machined by one machining method to manufacture the combustion chamber thin-wall part, without a prefabricated mold, low production cost, short cycle, and applicable to machining of single products, effectively avoiding the problems of the traditional technology, such as the need for a prefabricated mold, only applicable to machining of batch products, high investment cost, and long cycle.

[0069] Meanwhile, the application does not use the spinning process, and can also avoid plastic deformation of the part, without affecting the mechanical properties of the product, and increasing the service life of the product.

[0070] During machining, the outer profile surface 201 of the pipe 20 is machined first, and the inner profile surface 202 of the pipe 20 is not machined, still having a machining allowance, so that the rigidity of the whole pipe 20 is large, and the generation of a vibrating cutter can be reduced during machining of the pipe 20; and when the inner profile surface 202 of the pipe 20 is machined, the coaxial tooling 30 is welded on the outer profile surface 201 of the pipe 20, so that the force on the part during machining is as uniform as possible, machining is stable, the generation of a vibrating cutter can also be reduced, the vibration of a cutter during the whole machining process can be reduced, the precision and surface roughness of the part are ensured, and the yield of the part can be effectively improved.

[0071] The machining method of the application is applicable to the manufacture of thin-wall parts with small thickness and arc-shaped surfaces, and when different arc-shaped or sized target parts are encountered, the size of the tooling 30 can be increased or reduced as needed, without the need to redesign the process flow method, the whole process flow of the application is simple, and the machining cycle can be significantly shortened.

[0072] The above description is only the preferred embodiment of the application and the explanation of the applied technical principles. Those skilled in the art should understand that the application range involved in the application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the application (but not limited to) with similar functions to form technical solutions.

[0073] It should be understood that the size of the serial number of the steps in the summary of the application and the embodiments of the application does not absolutely mean the order of execution, the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the application.

Claims

1. A method for processing annular thin-walled parts of a combustion chamber, characterized in that: include: A wire threading hole for the cutting wire to pass through is formed on the cylindrical rod, wherein the axis of the wire threading hole is parallel to the axis of the cylindrical rod; Cutting the cylindrical bar into a tube using the cutting line, with a machining allowance between the inner wall of the tube and the contour line of the target part to form an edge portion for clamping by a machine tool chuck; Clamping the edge of the tube material with a machine tool chuck, and machining the outer contour surface of the target part from the outer diameter to the inner diameter of the tube material; Installing a circular tooling on the middle of the outer contour surface, and then machining the inner contour surface of the target part; Removing the tooling and grinding the tooling installation portion on the pipe material to form a target part; The outer contour surface and the inner contour surface are arc-shaped surfaces.

2. A method for processing annular thin-walled parts for combustion chambers according to claim 1, characterized in that: The method of installing the annular tooling in the middle of the outer contour surface includes: Welding the tooling and the outer contour surface together; The edge of the pipe is clamped, and the tool is turned to make the tool coaxial with the pipe.

3. A method for processing annular thin-walled parts for combustion chambers according to claim 2, characterized in that: The tooling is welded to the outer contour surface by argon arc spot welding.

4. A method for processing annular thin-walled parts for combustion chambers according to claim 3, characterized in that: The welding points between the tooling and the outer contour surface are at least 4 welding points that are evenly arranged.

5. The method for processing an annular thin-walled component for a combustion chamber according to claim 1, characterized in that: When turning the outer and inner contour surfaces of the target parts, the tube material is rough-machined first and then fine-machined.

6. The method for processing a combustion chamber annular thin-walled component according to claim 1, characterized in that: The inner contour surface of the target part is machined from the outer diameter to the inner diameter of the tube.

7. A method for processing annular thin-walled parts for combustion chambers according to claim 1, characterized in that: The raised side of the target part is the outer contour surface.

8. The method for processing a combustion chamber annular thin-walled component according to claim 1, characterized in that: The concave side of the target part is an inner contour surface.

9. A combustion chamber annular thin-walled member, characterized in that: It is obtained using the method for processing a combustion chamber annular thin-walled part according to any one of claims 1 to 8.

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