Circumferential graphite inclined lap type machining method

Abstract

The invention relates to a circumferential graphite inclined lap type processing method which is characterized by comprising the following steps: checking the parallelism, planeness and roughness of two surfaces of a graphite part, and selecting a first part main body and a second part main body which meet requirements, a first part main body is fixed to a first special clamp through a first pressing plate, a second pressing plate and a third pressing plate, five-axis machining is conducted on the first part main body, a second part main body is clamped to a second special clamp, and the second part main body is fixed through an auxiliary pressing plate; the second part main body is fixed through a fourth pressing plate, a fifth pressing plate, a sixth pressing plate, a seventh pressing plate and an eighth pressing plate in sequence, the large lap joint opening in the first part main body and the small lap joint opening in the second part main body which are subjected to five-axis machining are lapped together for mutual lapping, and the coloring condition of the corresponding inclined face is detected; in conclusion, the graphite piece coloring device has the advantages of simple structure, convenience in use, suitability for popularization and application in graphite pieces of the same type, satisfaction of coloring results and high product percent of pass.

Description

Technical Field

[0001] The invention belongs to the technical field of graphite sealing devices for aircraft engines, and in particular relates to a circumferential graphite oblique lap processing method. Background Art

[0002] Aircraft engines are highly complex and sophisticated thermal machines. As the heart of an aircraft, they are not only the driving force for the flight of an aircraft, but also an important driving force for the development of the aviation industry. Every important change in the history of human aviation is closely related to the technological progress of aircraft engines. After more than a hundred years of development, aircraft engines have developed into mature products with extremely high reliability. Among them, graphite sealing devices have the following characteristics: first, they are chemically stable and corrosion-resistant, and do not react with acids, alkalis and other agents; second, they are resistant to high temperatures and can remain stable in high temperature environments; finally, they have good lubricity and can be used in conjunction with other components. The above characteristics ensure that graphite sealing devices are widely used in aircraft engines.

[0003] During the processing of the graphite sealing device, it is necessary to perform surface processing according to the shape of the circumferential graphite. When processing the U-shaped surface and the V-shaped surface, there will be a processing angle error. The error range exceeds 39.1°~39.34°, and only 0 to 20% will appear in the subsequent coloring process, which cannot meet the existing requirement of coloring the overlapping surface of the circumferential graphite ring by not less than 80%. There are problems such as unscientific processing methods, low processing accuracy and product qualification rate that cannot meet the needs. Therefore, a circumferential graphite oblique lap processing method is urgently needed to solve the above-mentioned problems. Summary of the invention

[0004] In view of this, the present invention proposes a circumferential graphite bevel processing method, which is applied to aero-engine graphite sealing devices, and is mainly used to control the angle error value during bevel processing, to solve the technical problems of large errors in existing processing angles and reference flatness, inability to meet the requirements for overlapping surface coloring, and low product qualification rate.

[0005] In order to achieve the above technical objectives, the specific technical solutions adopted by the present invention are:

[0006] A circumferential graphite oblique lap processing method, characterized in that it comprises the following steps:

[0007] S1. Check the parallelism, flatness and roughness of the two surfaces of the graphite part, and select the first part body and the second part body that meet the requirements;

[0008] S2. The first part body is processed by a first special fixture, and the height of the first reference plane and the large overlap of the first special fixture are adjusted to keep the height of the reference plane and the large overlap of the first special fixture at 8 mm.

[0009] S3. Check and ensure that the reference plane of the first special fixture is within 0.005 and the tool runout used for processing is within 0.005;

[0010] S4, fixing the first part body on the first special fixture by using the first pressing plate, the second pressing plate and the third pressing plate, and then performing five-axis machining on the first part body;

[0011] S5. Process the second part body with the second special fixture, and adjust the height of the reference plane and the large overlap of the second special fixture on the first special fixture to keep the height of the reference plane and the large overlap of the second special fixture at 6 mm;

[0012] S6. Check and ensure that the second reference plane of the second special fixture is within 0.005 and the tool runout used for processing is within 0.005;

[0013] S7, clamping the second part body onto the second special fixture, and then first fixing the second part body with the auxiliary pressing plate, and then fixing the second part body with the fourth pressing plate, the fifth pressing plate, the sixth pressing plate, the seventh pressing plate and the eighth pressing plate in sequence;

[0014] S8. After clamping, use a 0.02mm feeler gauge to check the clearance of the positioning outer ring of the second part body. If the clearance of the positioning outer ring can fit the 0.02mm feeler gauge, the inspection fails and reinstall;

[0015] S9, five-axis machining is performed on the second part body that has passed the inspection;

[0016] S10, overlap the large overlap interface on the main body of the first part processed by five-axis and the small overlap interface on the main body of the second part for mutual research, and detect the coloring conditions of the two corresponding inclined surfaces.

[0017] Furthermore, in step S1, the two surfaces of the graphite part are surface A and surface B, the parallelism of surface A and surface B is less than 0.02, the flatness of surface A and surface B is less than 0.01, and the roughness of surface A and surface B is less than 0.4, thereby reducing the processing error of the subsequent overlap interface by screening the graphite parts.

[0018] Furthermore, in step S3, the reference plane and flatness of the first special fixture and the second special fixture are processed by adjusting the grinding parameters so as to meet the requirements.

[0019] Furthermore, in step S3, the adjusted grinding parameters include: grinding wheel linear speed 18 / ms is 15000mm / min, rough grinding wheel movement 2mm / srep, fine grinding wheel movement 0.6mm / srep, feed amount rough grinding 0.004 each time, and feed amount fine grinding 0.0025 each time.

[0020] Furthermore, in step S7, in the process of fixing the second part body, the ninth pressing plate, the tenth pressing plate and the eleventh pressing plate are used for auxiliary support to prevent the overlap from breaking.

[0021] Furthermore, in step S4, a meter is used to check whether the height difference between the first special fixture reference plane and the large overlap meets the requirement of 6 mm.

[0022] Furthermore, in step S9, a meter is used to check whether the height difference between the reference plane of the second special fixture and the small overlap meets the requirement of 8 mm.

[0023] Furthermore, in step S5, five-axis machining of the first part body is performed using a diamond-coated tool.

[0024] Furthermore, in step S9, five-axis machining of the second part body is performed using a diamond-coated tool.

[0025] By adopting the above technical solution, the present invention can also bring the following beneficial effects:

[0026] The present invention relates to a circular graphite bevel processing method, which ensures that the angle error value is within plus or minus 10 during the bevel processing stage, so that the graphite parts processed by five-axis can be colored to more than 95% during the subsequent processing, meeting more than 80% of the use requirements of the graphite parts. The grinding parameters are adjusted to ensure that the reference plane and parallelism of the flat grinding meet the requirements. The graphite parts are processed by a self-made first special fixture and a second special fixture and a diamond-coated knife to increase the flatness of the processed surface, thereby better controlling the angle between the plane and the bevel, and finally increasing the bevel lap contact surface during the mutual grinding of the grinding overlap interface, and finally achieving a qualified rate of more than 98%. The method has the advantages of simple structure, easy use, suitable for promotion and application in the same type of graphite parts, coloring results that meet the requirements and high product qualified rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 The present invention provides a schematic diagram of a connection structure between a first part body and a first special fixture in a circumferential graphite oblique lap processing method;

[0029] Figure 2 The present invention provides a schematic diagram of the connection structure between a second part body and a second special fixture in a circumferential graphite oblique lap processing method;

[0030] 1. The first part body; 2. The first reference plane; 3. The first special fixture; 4. The first pressing plate; 5. The second pressing plate; 6. The third pressing plate; 7. The small overlap interface; 8. The second reference plane; 9. The auxiliary pressing plate; 10. The large overlap interface; 11. The fourth pressing plate; 12. The fifth pressing plate; 13. The sixth pressing plate; 14. The seventh pressing plate; 15. The eighth pressing plate; 16. The second part body; 17. The ninth pressing plate; 18. The tenth pressing plate; 19. The eleventh pressing plate; 20. The second special fixture; DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0033] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present invention, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0034] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0035] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0036] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, a circumferential graphite oblique lap processing method is characterized by comprising the following steps:

[0037] S1, check the parallelism, flatness and roughness of the two surfaces of the graphite parts, select the first part body 1 and the second part body 16 that meet the requirements, the two surfaces of the graphite parts are respectively A surface and B surface, the parallelism of the A surface and the B surface is less than 0.02, the flatness of the A surface and the B surface is less than 0.01, and the roughness of the A surface and the B surface is less than 0.4, so as to reduce the processing error of the subsequent overlap interface by screening the graphite parts;

[0038] S2, the first part body 1 is processed by the first special fixture 3, and the height of the first reference plane 2 and the large overlap of the first special fixture 3 is adjusted to make the height of the reference plane and the large overlap of the first special fixture 3 remain at 8mm;

[0039] S3, check and ensure that the reference plane of the first special fixture 3 is within 0.005, the tool runout used for processing is within 0.005, and the reference plane and flatness of the first special fixture 3 and the second special fixture 20 are processed by adjusting the grinding parameters. The adjusted grinding parameters include: the grinding wheel linear speed 18 / ms is 15000mm / min, the rough grinding wheel moves 2mm / srep, the fine grinding wheel moves 0.6mm / srep, the feed amount is 0.004 each time for rough grinding, and the feed amount is 0.0025 each time for fine grinding;

[0040] S4, fix the first part body 1 on the first special fixture 3 through the first pressing plate 4, the second pressing plate 5 and the third pressing plate 6, and then use the diamond coated tool to perform five-axis machining on the first part body 1, and use the table method to check whether the height difference between the reference plane of the first special fixture 3 and the large overlap meets the requirement of 6mm after the five-axis machining;

[0041] S5, the second part body 16 is processed by the second special fixture 20, and the height of the reference plane and the large overlap of the second special fixture 20 measured on the first special fixture 3 is adjusted so that the height of the reference plane and the large overlap of the second special fixture 20 is maintained at 6mm;

[0042] S6, check and ensure that the second reference plane 8 of the second special fixture 20 is within 0.005, and the tool runout used for processing is within 0.005;

[0043] S7, clamp the second part body 16 onto the second special fixture 20, and then first fix the second part body 16 with the auxiliary pressing plate 9, and then fix the second part body 16 with the fourth pressing plate 11, the fifth pressing plate 12, the sixth pressing plate 13, the seventh pressing plate 14 and the eighth pressing plate 15 in sequence. In the process of fixing the second part body 16, the ninth pressing plate, the tenth pressing plate 18 and the eleventh pressing plate 19 are used for auxiliary support to prevent the overlap from breaking;

[0044] S8. After clamping, use a 0.02mm feeler gauge to check the clearance of the positioning outer ring of the second part body 16. If the clearance of the positioning outer ring can fit the 0.02mm feeler gauge, the inspection is unqualified and reinstall;

[0045] S9, use a diamond-coated cutter to perform five-axis machining on the second part body 16 that has passed the inspection, and use a table method to check whether the reference plane and the height of the small overlap of the second special fixture 20 processed by the five-axis machining meet the requirement of 8mm;

[0046] S10, overlap the large overlap joint 10 on the first part body 1 after five-axis processing and the small overlap joint 7 on the second part body 16 for mutual grinding, and check the coloring conditions of the two corresponding inclined surfaces.

[0047] In conclusion, the present invention has the advantages of simple structure, convenient use, suitability for promotion and application in graphite parts of the same type, coloring results that meet requirements and high product qualification rate.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A circumferential graphite oblique processing method, characterized in that: The steps include: S1, checking the parallelism, flatness and roughness of two surfaces of the graphite part, and selecting a first part body (1) and a second part body (16) that meet the requirements; S2, processing the first part body (1) with a first special fixture (3), adjusting the height of the reference plane and the large overlap of the first special fixture (3) to make the height of the reference plane and the large overlap of the first special fixture (3) remain at 8mm; S3, check and ensure that the first reference plane (2) of the first special fixture (3) is within 0.005, and the runout of the tool used for processing is within 0.005; S4, fixing the first part body (1) on the first special fixture (3) by means of the first pressing plate (4), the second pressing plate (5) and the third pressing plate (6), and then performing five-axis machining on the first part body (1); S5, processing the second part body (16) with the second special fixture (20), adjusting the height of the reference plane and the large overlap of the second special fixture (20) measured on the first special fixture (3), so that the height of the reference plane and the large overlap of the second special fixture (20) is maintained at 6 mm; S6, check and ensure that the second reference plane (8) of the second special fixture (20) is within 0.005, and the tool runout used for processing is within 0.005; S7, clamping the second part body (16) onto the second special fixture (20), and then first fixing the second part body (16) with the auxiliary pressing plate (9), and then fixing the second part body (16) with the fourth pressing plate (11), the fifth pressing plate (12), the sixth pressing plate (13), the seventh pressing plate (14) and the eighth pressing plate (15) in sequence; S8. After clamping, use a 0.02mm feeler gauge to check the clearance of the positioning outer ring of the second part body (16). If the clearance of the positioning outer ring can fit the 0.02mm feeler gauge, the inspection fails and reinstall. S9, performing five-axis machining on the second part body (16) that has passed the inspection; S10, the large overlap joint (10) on the first part body (1) processed by five axes and the small overlap joint (7) on the second part body (16) are overlapped together for mutual grinding, and the coloring conditions of the two corresponding inclined surfaces are detected.

2. A circumferential graphite oblique lap processing method as claimed in claim 1, characterized in that: In step S1, the two surfaces of the graphite part are surface A and surface B, the parallelism of surface A and surface B is less than 0.02, the flatness of surface A and surface B is less than 0.01, and the roughness of surface A and surface B is less than 0.4, thereby reducing the processing error of the subsequent overlap interface by screening the graphite parts.

3. A circumferential graphite oblique lap processing method as claimed in claim 2, characterized in that: In the step S3, the reference plane and the flatness of the first special fixture (3) and the second special fixture (20) are processed by adjusting the grinding parameters so as to meet the requirements.

4. A circumferential graphite oblique lap processing method as claimed in claim 3, characterized in that: In step S3, the adjusted grinding parameters include: grinding wheel linear speed 18 / ms is 15000mm / min, rough grinding wheel movement 2mm / srep, fine grinding wheel movement 0.6mm / srep, feed amount rough grinding 0.004 each time, and feed amount fine grinding 0.0025 each time.

5. A circumferential graphite oblique lap processing method as claimed in claim 4, characterized in that: In the step S7, in the process of fixing the second part body (16), the ninth pressing plate, the tenth pressing plate (18) and the eleventh pressing plate (19) are used for auxiliary support to prevent the overlap from breaking.

6. A circumferential graphite oblique lap processing method as claimed in claim 5, characterized in that: In step S4, a meter is used to check whether the height difference between the reference plane of the first special fixture (3) and the large overlap meets the requirement of 6 mm.

7. A circumferential graphite oblique lap processing method as claimed in claim 6, characterized in that: In step S9, a meter is used to check whether the height difference between the reference plane of the second special fixture (20) and the small overlap meets the requirement of 8 mm.

8. A circumferential graphite oblique lap processing method as claimed in claim 7, characterized in that: In the step S5, five-axis machining of the first part body (1) is performed using a diamond-coated tool.

9. A circumferential graphite oblique lap processing method as claimed in claim 8, characterized in that: In the step S9, five-axis machining of the second part body (16) is performed using a diamond-coated tool.

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