A machining method for a funnel part of an aero-engine

Abstract

This invention relates to the field of aero-engine parts processing technology, and particularly to a processing method for an aero-engine funnel part, comprising the following steps: S1, machining the end face of the flange edge and drilling holes: clamping the funnel part in a first fixture, using the lower end face A of the flange edge blank on the funnel part as the support surface, positioning the outer circle B, and pressing it onto the top surface C of the flange edge blank; machining the upper end face of the flange edge and machining through holes N; S2, machining the outer surface of the bushing and the outer surface of the flange edge: installing a second fixture on a CNC lathe, using the upper end face of the flange edge machined in step S1 as the support and the two through holes N as the center positioning reference, inverting the funnel part and clamping it in the second fixture, first machining a center hole P on the end face of the bushing blank; then pressing the machine tool center onto the center hole P, and then machining the outer surface of the bushing and the outer surface of the flange edge; S3, removing the machine tool center and drilling through holes M on the bushing.

Description

Technical Field

[0001] This invention relates to the field of aero-engine parts processing technology, and in particular to a processing method for an aero-engine funnel part. Background Technology

[0002] Combination Figure 1 The diagram shows a funnel-shaped component on an aircraft engine, a crucial part of the internal cone assembly. The funnel-shaped component is assembled by welding together a flange 1, a cone 2, a transition section 3, a pipe 4, and a bushing 5. After welding, the flange 1 and bushing 5 require machining, including turning and drilling. Specifically, this includes:

[0003] (1) The top surface and outer peripheral surface of flange edge 1 need to be machined, and the flange edge 1 also needs to be drilled to machine through holes N on flange edge 1. Figure 1 The dashed line at the edge of the middle flange indicates the blank allowance of the flange edge.

[0004] (2) The outer circumferential surface of the bushing 5 needs to be machined, and the bushing 5 also needs to be drilled to machine the through hole M on the bushing 5. Figure 1 The dashed box at the middle bushing indicates the allowance of the bushing blank.

[0005] In existing machining methods, when machining flange edge 1, the bushing blank on the workpiece is used as the clamping point. Specifically, the lower end face of the bushing blank abuts against the platform of the fixture and is pressed against the upper end face of the bushing blank. This clamping method has the following problems:

[0006] First, the flange edge end face is not parallel to the bushing blank end face due to factors such as welding deformation. After processing, the runout of the flange edge end face is likely to exceed the processing dimensional tolerance requirements, resulting in a low pass rate when processing the flange edge.

[0007] Secondly, the funnel part is a weakly rigid part, and vibration is easily generated during the machining of the flange edge, resulting in the surface roughness after machining not meeting the design requirements. Summary of the Invention

[0008] The main objective of this invention is to propose a processing method for aero-engine funnel parts, aiming to solve the aforementioned technical problems.

[0009] To achieve the above objectives, this invention proposes a method for processing an aero-engine funnel part, comprising the following steps:

[0010] S1. Machining the end face of the flange edge and drilling: Install the first fixture on the CNC turning and milling machine tool, and clamp the funnel part in the first fixture. Use the lower end face A of the flange edge blank on the funnel part as the support surface, and position the outer circle B on the top surface C of the flange edge blank. Machining the upper end face of the flange edge and drilling the flange edge to machine through hole N.

[0011] S2. Machining the outer surfaces of the bushing and flange: Install the second fixture on the CNC lathe, using the upper end face of the flange machined in step S1 as support and the two through holes N as the center positioning reference, invert the funnel part and clamp it in the second fixture. First, machine the center hole P on the end face of the bushing blank; then, place the machine tool center on the center hole P, and then machine the outer surface of the bushing and the outer surface of the flange.

[0012] S3. Remove the machine tool center and drill the through hole M on the bushing.

[0013] Preferably, in step S1, a countersunk plate with a diameter of φE is machined on the flange blank, and the bottom surface of the countersunk plate forms the upper end face of the flange edge; the design diameter of the top step circle of the flange edge is φD; satisfying that φE is 1mm to 2mm larger than φD.

[0014] Preferably, the first clamp includes a first base plate and a first positioning ring spaced apart directly above the first base plate; the first positioning ring and the first base plate are connected by multiple columns; a positioning stop is provided at the edge of the opening of the central hole of the first positioning ring; in step S1, when the funnel part is clamped using the first clamp, the lower end face A of the flange blank abuts against the bottom surface of the positioning stop, and the outer circle B of the flange blank cooperates with the inner hole surface of the positioning stop.

[0015] Preferably, the first clamp further includes a plurality of L-shaped pressure plates; each L-shaped pressure plate includes a horizontal pressing part and a vertical guide rod integrally formed on the horizontal pressing part, and a screw part integrally formed at the lower end of the vertical guide rod part; the horizontal pressing part is used to press against the top surface C of the flange blank; the vertical guide rod part is inserted into the first positioning ring; and the vertical guide rod part is slidably engaged with the first positioning ring; the screw part extends from the lower end face of the first positioning ring and is screwed with a locking nut.

[0016] Preferably, the upper and lower ends of the column are integrally formed with flange plates; the flange plate at the lower end of the column is connected to the first base plate by a first screw; the flange edge at the upper end of the column is connected to the first positioning ring by a second screw.

[0017] Preferably, the first clamp further includes an auxiliary support; a threaded hole is provided at the center of the first base plate; the lower part of the auxiliary support is a threaded rod, which is screwed into the threaded hole at the center of the first base plate; a fixing nut is screwed onto the threaded rod at the lower part of the auxiliary support; the upper part of the auxiliary support is a support platform; in step S1, when clamping the funnel part using the first clamp, the height of the auxiliary support is adjusted by rotating it so that the support platform at the upper part of the auxiliary support supports the lower end surface of the bushing blank of the funnel part, and then the fixing nut is rotated so that the lower end surface of the fixing nut abuts against the top surface of the first base plate.

[0018] Preferably, the auxiliary support has a ring-shaped platform in the middle, and a transverse through hole is formed on the ring-shaped platform.

[0019] Preferably, the second clamp includes a second base plate and a second positioning ring; the second positioning ring is mounted on the top surface of the second base plate; multiple threaded holes, a cylindrical pin, and a diamond pin are provided on the upper end face of the second positioning ring; in step S2, when the funnel part is clamped using the second clamp, the funnel part is upside down on the second positioning ring, and the top end of the second positioning ring is inserted into the countersunk with a diameter of φE processed in step S1; the cylindrical pin and the diamond pin are respectively inserted into two through holes N on the flange side for positioning; fixing screws are inserted into the remaining through holes N, and the fixing screws are tightened into the threaded holes on the top surface of the second positioning ring.

[0020] Preferably, the cylindrical pin and the rhomboid pin are positioned at 180° relative to the center of the second positioning ring.

[0021] Preferably, the second positioning ring is fastened to the second base plate by a pin and a third screw; the second base plate is an annular plate, the second positioning ring is coaxially arranged with the second base plate, and an alignment band is provided on the outer circumferential surface of the second base plate.

[0022] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0023] (1) In this invention, when processing the flange edge, the first fixture is used for clamping, with the lower end face A of the flange edge blank on the funnel part as the support surface, the outer circle B for positioning, and pressed on the top surface C of the flange edge blank. This can effectively overcome the problems existing in the prior art when using the bushing blank as the clamping part, improve the processing accuracy of the flange edge end face, and reduce the vibration that is easily generated during processing.

[0024] (2) In this invention, the first clamp and the second clamp can achieve rapid and accurate clamping and positioning of the funnel-shaped parts, significantly improving clamping stability. The parts are less likely to loosen during processing, avoiding processing errors and scrap due to unstable clamping, and ensuring the smooth progress of the processing.

[0025] (3) In this invention, the first fixture is provided with an auxiliary support structure, which is threadedly connected to the first base plate. The height of the auxiliary support can be flexibly adjusted according to the processing requirements of the part. During the processing, it provides stable support for the funnel part, enhances the rigidity of the part, resists the cutting force, helps to avoid the deformation of the part, and ensures the processing accuracy and surface quality.

[0026] (4) Significantly improves processing efficiency. The processing method provided by this invention optimizes the processing flow, rationally arranges processing steps, and reduces unnecessary processing steps and tool change time. Specifically, it is reflected in: first processing the flange edge end face and drilling hole N, then drilling the center hole on the bushing blank, and then performing subsequent processing in sequence, making the processing process smooth and efficient.

[0027] (5) The combination of cylindrical and diamond pins in the second fixture allows for rapid positioning of the conical parts and quick screw fixing. Compared with traditional clamping methods, clamping time is significantly shortened, improving equipment utilization. Compared with existing technologies, production efficiency is doubled, effectively shortening the production cycle and meeting the large-scale production needs of aero-engine manufacturing enterprises. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the allowance before machining the aero-engine funnel part of the present invention. In the figure: the dashed line at the flange edge represents the allowance of the flange edge blank; the dashed box at the bushing represents the allowance of the bushing blank.

[0030] Figure 2 Schematic diagram for machining flange edge face and drilling;

[0031] Figure 3 This is a schematic diagram of clamping the funnel part using the first clamp.

[0032] Figure 4 This is a schematic diagram of clamping the funnel part using the second clamp.

[0033] Figure 5 This is a top view of the second fixture.

[0034] Figure 6 This is a schematic diagram of the outer surface of the bushing in this invention;

[0035] Figure 7This is a schematic diagram of the flange edge outer surface and bushing hole processed in this invention.

[0036] Explanation of reference numerals: 1. Flange edge; 2. Cone; 3. Adapter section; 4. Pipe; 5. Bushing; 6. First base plate; 7. First screw; 8. Column; 9. Locking nut; 10. Second screw; 11. First positioning ring; 11a. Positioning stop; 12. L-shaped pressure plate; 12a. Horizontal clamping part; 12b. Vertical smooth rod part; 12c. Screw part; 13. Auxiliary support; 14. Fixing nut; 15. Second base plate; 15a. Alignment belt; 16. Second positioning ring; 17. Washer; 18. Fixing screw; 19. Diamond pin; 20. Third screw; 21. Pin; 22. Cylindrical pin. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] As shown in the attached figures, a method for machining an aero-engine funnel part includes the following steps:

[0041] S1. Machining the end face of flange edge 1 and drilling: Install the first fixture on the CNC turning and milling machine tool, and clamp the funnel part in the first fixture. Use the lower end face A of the flange edge blank on the funnel part as the support surface, and position the outer circle B on the top surface C of the flange edge blank. Machining the upper end face of flange edge 1 and drilling a through hole N in flange edge 1.

[0042] S2. Machining the outer surfaces of bushing 5 and flange edge 1: Install the second fixture on the CNC lathe. Using the upper end face of flange edge 1 machined in step S1 as support and the two through holes N as the center positioning reference, invert the funnel part and clamp it in the second fixture. First, machine the center hole P on the end face of the bushing blank; then, place the machine tool center onto the center hole P, and then machine the outer surface of bushing 5 and flange edge 1. The machining area of ​​the outer surface of bushing 5 is as follows: Figure 6 The area indicated by the thick line at point N. The machined area of ​​the outer surface of flange edge 1 is as follows. Figure 1 The area indicated by the thick line at point F.

[0043] S3. Remove the machine tool center and drill the through hole M on the bushing 5.

[0044] Combination Figure 2 As shown, in step S1, a countersunk plate with a diameter of φE is machined on the flange blank, and the bottom surface of the countersunk plate forms the upper end face of the flange 1; the design diameter of the top step circle of the flange 1 is φD; satisfying that φE is 1mm to 2mm larger than φD.

[0045] Combination Figure 6 As shown, in step S2, during the machining of the outer surface of the bushing 5, a protrusion with a diameter of φC is retained at the position of the center hole P. That is, a protrusion with a diameter of φC is retained on the boss at the end of the bushing 5, where φC is 1mm to 2mm smaller than the diameter of the through hole M. During drilling in step S3, the protrusion with a diameter of φC is removed.

[0046] Combination Figure 3 As shown, the first clamp includes a first base plate 6 and a first positioning ring 11 spaced apart directly above the first base plate 6; the first positioning ring 11 is connected to the first base plate 6 by multiple columns 8; a positioning stop 11a is provided at the edge of the opening of the central hole of the first positioning ring 11. The upper and lower ends of the columns 8 are respectively integrally formed with flange plates; the flange plate at the lower end of the column 8 is connected to the first base plate 6 by a first screw 7; the flange edge at the upper end of the column 8 is connected to the first positioning ring 11 by a second screw 10.

[0047] Combination Figure 2 and Figure 3 As shown, in step S1, when the funnel part is clamped using the first clamp, the lower end face A of the flange blank abuts against the bottom surface of the positioning stop 11a, and the outer circle B of the flange blank mates with the inner hole surface of the positioning stop 11a.

[0048] Furthermore, the first clamp also includes a plurality of L-shaped pressure plates 12; each L-shaped pressure plate 12 includes a horizontal pressing part 12a and a vertical guide rod part 12b integrally formed on the horizontal pressing part 12a, and a screw part 12c integrally formed at the lower end of the vertical guide rod part 12b; the horizontal pressing part 12a is used to press against the top surface C of the flange blank; the vertical guide rod part 12b is inserted into the first positioning ring 11; and the vertical guide rod part 12b slides with the first positioning ring 11; the screw part 12c extends from the lower end face of the first positioning ring 11 and is screwed with a locking nut 9.

[0049] In step S1, when clamping the funnel part using the first clamp, the horizontal pressing part 12a of the L-shaped pressure plate 12 is pressed onto the top surface C of the flange blank by rotating the L-shaped pressure plate 12, and then the locking nut 9 is tightened to complete the clamping operation.

[0050] Combination Figure 3 As shown, the first clamp also includes an auxiliary support 13; a threaded hole is provided at the center of the first base plate 6; the lower part of the auxiliary support 13 is a threaded rod, which is screwed into the threaded hole at the center of the first base plate 6; a fixing nut 14 is screwed onto the threaded rod at the lower part of the auxiliary support 13; the upper part of the auxiliary support 13 is a support platform; in step S1, when clamping the funnel part using the first clamp, the height of the auxiliary support 13 is adjusted by rotating it, so that the support platform at the upper part of the auxiliary support 13 supports the lower end surface of the bushing blank of the funnel part, and then the fixing nut 14 is rotated so that the lower end surface of the fixing nut 14 abuts against the top surface of the first base plate 6 to limit the axial position of the auxiliary support 13. By using the auxiliary support 13 to support the lower end surface of the bushing blank, the rigidity of the funnel part is enhanced.

[0051] Furthermore, the auxiliary support 13 has a ring-shaped platform at its center, and a transverse through hole 13a is formed on the ring-shaped platform. When adjusting the height of the auxiliary support 13, tools such as iron bars can be inserted into the transverse through hole 13a to facilitate the rotation of the auxiliary support 13.

[0052] Combination Figure 4 and Figure 5 As shown, the second fixture includes a second base plate 15 and a second positioning ring 16; the second positioning ring 16 is mounted on the top surface of the second base plate 15; a plurality of threaded holes, a cylindrical pin 22 and a diamond pin 19 are provided on the upper end surface of the second positioning ring 16.

[0053] In step S2, when the funnel part is clamped using the second clamp, the funnel part is upside down on the second positioning ring 16, and the top end of the second positioning ring 16 is inserted into the countersunk with a diameter of φE processed in step S1; the cylindrical pin 22 and the diamond pin 19 are respectively inserted into the two through holes N of the flange edge 1 for positioning; the remaining through holes N are fitted with fixing screws 18, and the fixing screws 18 are screwed into the threaded holes on the top surface of the second positioning ring 16.

[0054] Combination Figure 5 As shown, the cylindrical pin 22 and the rhomboid pin 19 are positioned at 180° relative to the center of the second positioning ring 16.

[0055] Combination Figure 4 and Figure 5 As shown, the second positioning ring 16 is fastened to the second base plate 15 by a pin 21 and a third screw 20. The second base plate 15 is an annular plate, and the second positioning ring 16 is coaxially arranged with the second base plate 15. A alignment band 15a is provided on the outer peripheral surface of the second base plate 15. Specifically, the bottom area of ​​the groove on the outer peripheral surface of the second base plate 15 is the alignment band 15a, which is used for alignment during processing.

[0056] 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 machining an aero-engine funnel part, characterized in that, Includes the following steps: S1. Machining the end face of flange edge (1) and drilling: Install the first fixture on the CNC turning and milling composite machine tool, and clamp the funnel part in the first fixture. Use the lower end face A of the flange edge blank on the funnel part as the support surface, and position the outer circle B on the top surface C of the flange edge blank. Machining the upper end face of flange edge (1), drilling the flange edge (1), and machining through hole N. S2. Machining the outer surface of the bushing (5) and the outer surface of the flange edge (1): Install the second fixture on the CNC lathe, using the upper end face of the flange edge (1) machined in step S1 as support and the two through holes N as the center positioning reference, invert the funnel part and clamp it in the second fixture. First, machine the center hole P on the end face of the bushing blank; then, press the machine tool center onto the center hole P, and then machine the outer surface of the bushing (5) and the outer surface of the flange edge (1). S3. Exit the machine tool center and drill the through hole M on the bushing (5); The first fixture includes a first base plate (6) and a first positioning ring (11) spaced apart directly above the first base plate (6); The first positioning ring (11) is connected to the first base plate (6) by multiple columns (8); A positioning stop (11a) is provided at the edge of the opening of the central hole of the first positioning ring (11). In step S1, when the funnel part is clamped using the first clamp, the lower end face A of the flange blank abuts against the bottom surface of the positioning stop (11a), and the outer circle B of the flange blank mates with the inner hole surface of the positioning stop (11a). The first clamp also includes multiple L-shaped pressure plates (12); The L-shaped pressure plate (12) includes a horizontal pressing part (12a) and a vertical smooth rod part (12b) integrally formed on the horizontal pressing part (12a). A screw part (12c) is integrally formed at the lower end of the vertical smooth rod part (12b). The horizontal pressing part (12a) is used to press against the top surface C of the flange blank; The vertical light rod portion (12b) is inserted into the first positioning ring (11); and the vertical light rod portion (12b) and the first positioning ring (11) are in sliding engagement; The screw portion (12c) extends from the lower end face of the first positioning ring (11) and is screwed with a locking nut (9). The first clamp also includes an auxiliary support (13); A threaded hole is provided in the center of the first base plate (6); the lower part of the auxiliary support (13) is a threaded rod, which is screwed into the threaded hole in the center of the first base plate (6); a fixing nut (14) is screwed onto the threaded rod at the lower part of the auxiliary support (13); the upper part of the auxiliary support (13) is a support platform; In step S1, when clamping the funnel part using the first clamp, the height of the auxiliary support (13) is adjusted by rotating it so that the support platform on the upper part of the auxiliary support (13) is supported on the lower end surface of the bushing blank of the funnel part. Then, the fixing nut (14) is rotated so that the lower end surface of the fixing nut (14) abuts against the top surface of the first base plate (6).

2. The method for processing an aero-engine funnel part as described in claim 1, characterized in that, In step S1, a diameter of [missing information] is machined onto the flange blank. The recessed platform of E, the bottom surface of which forms the upper end face of the flange edge (1); the design diameter of the top step circle of the flange edge (1) is... D; satisfy: E D is 1mm to 2mm larger.

3. The method for processing an aero-engine funnel part as described in claim 1, characterized in that, The upper and lower ends of the column (8) are integrally formed with flange plates; The flange plate at the lower end of the column (8) is connected to the first base plate (6) by the first screw (7); The flange edge at the upper end of the column (8) is connected to the first positioning ring (11) by the second screw (10).

4. The processing method for an aero-engine funnel part as described in claim 1, characterized in that, The auxiliary support (13) has a ring platform in the middle, and a transverse through hole (13a) is provided on the ring platform.

5. The method for processing an aero-engine funnel part as described in claim 2, characterized in that, The second fixture includes a second base plate (15) and a second positioning ring (16); the second positioning ring (16) is mounted on the top surface of the second base plate (15); a plurality of threaded holes, a cylindrical pin (22) and a diamond pin (19) are provided on the upper end face of the second positioning ring (16). In step S2, when the funnel part is clamped using the second clamp, the funnel part is upside down on the second positioning ring (16), and the top end of the second positioning ring (16) is inserted into the diameter machined in step S1. In the recess of E; cylindrical pin (22) and diamond pin (19) are respectively inserted into the two through holes N of the flange edge (1) for positioning; the remaining through holes N are fitted with fixing screws (18), and the fixing screws (18) are screwed into the threaded holes on the top surface of the second positioning ring (16).

6. The method for processing an aero-engine funnel part as described in claim 5, characterized in that, The cylindrical pin (22) and the rhomboid pin (19) are set at 180° relative to the center of the second positioning ring (16).

7. The method for processing an aero-engine funnel part as described in claim 5, characterized in that, The second positioning ring (16) is fastened to the second base plate (15) by a pin (21) and a third screw (20); The second base plate (15) is an annular plate, the second positioning ring (16) is coaxially arranged with the second base plate (15), and a leveling band (15a) is provided on the outer circumferential surface of the second base plate (15).

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