A machining method of a bossed oil screen of an aero-engine

Abstract

A kind of processing method of aero-engine with boss oil screen, comprising the following steps: step S1, blanking: blank diameter is smaller than part diameter;Along the height direction, the big end of blank, small end respectively reserved margin;Step S2, expansion: blank is placed into expansion die and is expanded, and the expansion die realizes overall forming of part by the way of inner expansion and outer shrinkage;Step S3, laser cutting hole and groove: the part is supported round, and the hole body is cut on the circular table, and the square notch is cut on the square boss;Step S4, laser cutting end face: the part is supported round from inner surface, and the small end of the part is gripped on outer surface, first cut the big end of the part, ensure the diameter of big end, then cut the small end, ensure the height and small end diameter of the part.Overall forming of the heat shield with boss is realized by the way of inner expansion and outer shrinkage, which effectively improves the forming quality.Laser cutting hole body and square groove, end face can effectively ensure the size precision of the part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine manufacturing, in particular to a machining method of an aero-engine oil screen with bosses. BACKGROUND

[0002] As Figure 1 The aero-engine oil screen with bosses is shown in the schematic diagram of the part to be machined, which is a straight cone cylinder structure, and has two rows of circular platforms on the conical wall. Each circular platform has a hole body in the middle, which is 28 hole bodies and is uniformly distributed along the circumference. Square bosses are uniformly distributed in the middle of the adjacent two rows of circular platforms, and square notches are opened on the square bosses. The part has a complex shape, high size and profile precision. In the traditional machining method, the part boss is difficult to be machined at one time, the notch and the small hole are difficult to be machined, the size and the shape precision are difficult to be guaranteed, the process is complex, the quality is unstable, and the machining cycle is long. SUMMARY

[0003] The main purpose of the present application is to provide a machining method of an aero-engine oil screen with bosses, which aims to solve the above technical problems.

[0004] To achieve the above purpose, the present application provides a machining method of an aero-engine oil screen with bosses, which comprises the following steps:

[0005] Step S1, blanking: the blank diameter is smaller than the part diameter; along the height direction, the large end and the small end of the blank are reserved with a margin;

[0006] Step S2, bulging: the blank is put into the bulging die to perform bulging, and the bulging die realizes the overall forming of the part by adopting the way of inner bulging and outer shrinking;

[0007] Step S3, laser cutting hole and slot: the part is supported and the hole body is cut on the circular platform, and the square notch is cut on the square boss;

[0008] Step S4, laser cutting end face: the part is supported from the inner surface, the small end of the part is clamped on the outer surface, the large end of the part is cut first to ensure the diameter of the large end, and then the small end is cut to ensure the height and the diameter of the small end of the part.

[0009] Preferably, in step S1, the blank diameter is 10-20mm smaller than the part diameter, and the large end and the small end of the blank are reserved with a margin of 20-30mm.

[0010] Preferably, in step S2, the bulging is performed on a 16000KN hydraulic machine, the main cylinder pressure is 100-120MPa, and the auxiliary cylinder pressure is 80-100Mpa.

[0011] Preferably, in step S2, the expansion die comprises a lower die plate, an outer cone and an inner cone arranged on the lower die plate, and an expansion block assembly and a concave die block assembly; the outer cone has an inner wall surface in the shape of an inverted cone; the inner cone has an outer wall surface in the shape of a normal cone; the expansion block assembly is arranged on the outer wall surface of the inner cone, and the expansion block assembly is arranged in the form of a plurality of annular arrays of expansion blocks, the expansion blocks being slidable along the generatrix direction of the outer wall surface of the inner cone; the concave die block assembly is arranged on the inner wall surface of the outer cone, and the concave die block assembly is arranged in the form of a plurality of annular arrays of concave die blocks, the concave die blocks being slidable along the generatrix direction of the inner wall surface of the outer cone; an annular top plate is arranged at the interval between the outer cone and the inner cone, and the lower end surfaces of the concave die blocks and the expansion blocks are arranged to abut against the upper surface of the annular top plate; a plurality of top rod holes are arranged on the lower die plate to align with the annular top plate; the top surface of the expansion block assembly is flush with the top surface of the concave die block assembly, and an upper die plate is arranged at the position of the top surfaces of the expansion block assembly and the concave die block assembly.

[0012] Preferably, a plurality of first tangent planes are arranged on the inner wall surface of the outer cone, and the concave die blocks are in sliding cooperation with the first tangent planes; a plurality of second tangent planes are arranged on the outer wall surface of the inner cone, and the expansion blocks are in sliding cooperation with the second tangent planes.

[0013] Preferably, a plurality of guide plates are arranged on the inner wall surface of the outer cone and on the outer wall surface of the inner cone respectively, and the cross section of each guide plate is in the shape of T; T-shaped grooves are arranged on the concave die blocks and the expansion blocks respectively and in sliding cooperation with the guide plates.

[0014] Preferably, displacement grooves are arranged on the inner hole surface and the outer wall surface of the annular top plate respectively; the positions of the displacement grooves correspond to the positions of the guide plates, and the groove width of each displacement groove is greater than the width of the corresponding guide plate.

[0015] Preferably, clamping grooves are arranged on the inner wall surface of the outer cone and on the outer wall surface of the inner cone respectively, and the guide plates are arranged in the clamping grooves and fixed by screws.

[0016] Preferably, a plurality of first lifting bolts are arranged on the inner hole surface of the inner cone; a plurality of second lifting bolts are arranged on the outer wall surface of the lower die plate; a plurality of third lifting bolts are arranged on the outer wall surface of the upper die plate; a plurality of fourth lifting bolts are arranged on the outer wall surface of the outer cone; and a lightening hole is arranged at the center position of the lower die plate and the upper die plate respectively.

[0017] Preferably, the upper end and the lower end of the inner surface of the concave die block are arranged in the shape of a cylindrical surface; and the upper end and the lower end of the outer surface of the expansion block are arranged in the shape of a cylindrical surface.

[0018] Thanks to the above technical solutions, the present application has the following advantages:

[0019] (1) In the present application, the inner expansion and outer shrinkage mode is adopted to realize the overall one-time forming of the heat shield with boss, effectively improving the forming quality; the inner expansion and outer shrinkage part has a certain springback, and the part can be controlled in size and shape precision by removing the bulge block assembly. In addition, in the present application, laser cutting holes and square grooves, end faces can effectively ensure the size precision of the part.

[0020] (2) Compared with the traditional process, the machining method provided by the present application is used to machine the aviation engine oil screen with boss, which is simple and reasonable, and can realize the machining of small holes and end faces at the same time. The efficiency is high, the labor intensity is low, the part machining quality is stable, and the qualified rate is high. When laser cutting the end face, the part is clamped by the outer hoop, which effectively avoids the problem of product deformation caused by stress release due to the cutting of square grooves, which causes the cutting size to be out of tolerance.

[0021] (3) In the bulging die used in the present application, the concave block assembly is arranged in a plurality of annular arrays, and the concave block can slide along the generatrix direction of the outer cone inner surface; at the same time, the bulge block assembly is arranged in a plurality of annular arrays, and the bulge block can slide along the generatrix direction of the inner cone outer surface. When bulging, the equipment drives the upper die plate to press on the bulge block assembly and the concave block assembly, and then drives the bulge block and the concave block to move downward at the same time, the diameter of the bulge block assembly increases, and the diameter of the concave block assembly decreases, realizing the one-time forming of the inner expansion and outer shrinkage of the part. The bulging die structure is simple, and the bulging operation is simple and fast. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0023] Figure 1 It is a schematic diagram of the part of the aviation engine oil screen with boss to be machined;

[0024] Figure 2 It is a sectional view of the bulging die in the present application;

[0025] Figure 3 It is a structural schematic diagram of the bulging die in the present application after removing the upper die plate and the concave block assembly;

[0026] Figure 4 It is a structural exploded view of the outer cone and the concave block assembly of the bulging die in the present application;

[0027] Figure 5 Fig. 3 is a structural exploded view of the inner cone and bulge assembly of the bulging die in the present application;

[0028] Figure 6 Fig. 4 is a structural view of the annular top plate of the bulging die in the present application;

[0029] Figure 7 Fig. 5 is a structural view of the lower die plate of the bulging die in the present application;

[0030] Figure 8 Fig. 6 is a structural view of the upper die plate of the bulging die in the present application;

[0031] Figure 9 Fig. 7 is a structural view of the guide plate of the bulging die in the present application.

[0032] BRIEF DESCRIPTION OF DRAWINGS 100, oil baffle; 101, hole body; 102, circular table; 103, square boss; 104, square notch; 1, lower die plate; 2, outer cone; 201, first tangent plane; 3, annular top plate; 301, accommodation slot; 4, die block; 5, bulge; 6, inner cone; 601, second tangent plane; 7, upper die plate; 8, guide plate; 9, first lifting bolt; 10, second lifting bolt; 11, cylindrical pin; 12, screw; 13, ejector pin hole; 14, third lifting bolt; 15, fourth lifting bolt; 16, clamping slot. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0035] In addition, the description related to "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0036] As Figure 1 The figure shows the schematic diagram of the bossed oil screen part to be processed in the aero-engine. The oil screen 100 is a straight rotating conical cylinder structure, and there are two rows of circular platforms 102 on the conical wall. Each circular platform has a hole body 101 in the middle, and there are 28 hole bodies 101 uniformly distributed along the circumference. Square bosses 103 are uniformly distributed in the middle of the adjacent two rows of circular platforms 102, and square notches 104 are opened on the square bosses 103.

[0037] A machining method of an aero-engine bossed oil screen, comprising the following steps:

[0038] Step S1, blanking: the blank size is that after drawing an inclined line from the small end to the large end, the single side is reduced inward by 5-10mm, that is, the blank diameter is made to be smaller than the part diameter by 10-20mm; along the height direction, the large end and the small end of the blank are respectively reserved with a 20-30mm excess.

[0039] Step S2, bulging: the blank is placed in the bulging die to perform bulging, and the bulging die realizes the overall forming of the part by the way of internal bulging and external shrinking; specifically, the forming is performed on a 16000KN hydraulic machine, the main cylinder pressure is 100-120MPa, and the auxiliary cylinder pressure is 80-100Mpa.

[0040] Step S3, laser cutting hole and slot: the part is supported round, the hole body 101 is cut on the circular platform 102, and the square notch 104 is cut on the square boss 103. Specifically, the equipment used is a laser cutting machine, the part is supported round by a laser cutting clamp, the part model is matched with the actual part, the laser burning function is used to burn on the circular platform 102 and the square boss 103, and then the cutting is performed after measurement.

[0041] Step S4, laser cutting end face: the part is supported round from the inner surface, the small end of the part is clamped on the outer surface, the large end of the part is cut first to ensure the diameter of the large end, and then the small end is cut to ensure the height and diameter of the small end. Before cutting, the laser burning function is used for burning, and then the part end face is cut after measurement.

[0042] In the city embodiment, laser cutting uses nitrogen as gas, and the part can be protected and cooled during cutting.

[0043] In combination Figure 2 As shown in the figure, in step S2, the expansion die includes a lower die plate 1, an outer cone 2 and an inner cone 6 arranged on the lower die plate 1, and an expansion block assembly and a concave die assembly; the outer cone 2 has an inner surface in the shape of an inverted cone; the inner cone 6 has an outer surface in the shape of a normal cone; the expansion block assembly is installed on the outer surface of the inner cone 6, the expansion block assembly is arranged in the form of a plurality of annular arrays of expansion blocks 5, and the expansion blocks 5 can slide along the generatrix direction of the outer surface of the inner cone 6; the concave die assembly is installed on the inner surface of the outer cone 2, the concave die assembly is arranged in the form of a plurality of annular arrays of concave dies 4, and the concave dies 4 can slide along the generatrix direction of the inner surface of the outer cone 2; an annular top plate 3 is arranged at the interval between the outer cone 2 and the inner cone 6, and the lower end surfaces of the concave dies 4 and the expansion blocks 5 abut against the upper surface of the annular top plate 3; a plurality of top rod holes 13 aligned with the annular top plate 3 are arranged on the lower die plate 1; the top surface of the expansion block assembly is flush with the top surface of the concave die assembly, and an upper die plate 7 is arranged at the position of the top surfaces of the expansion block assembly and the concave die assembly.

[0044] The working principle of the expansion die is as follows:

[0045] The lower die plate 1 is fixed on the lower platform of the equipment, the upper die plate 7 is fixed on the upper platform of the equipment, the equipment is raised, the upper die plate 7 is separated to be capable of putting in the part, the equipment drives the top rod of the cylinder to lift the annular top plate 3, the annular top plate 3 drives the concave die assembly and the expansion block assembly to move upward, so that the concave dies 4 and the expansion blocks 5 are separated, at this time, the inner diameter of the concave die assembly increases and the outer diameter of the expansion block assembly decreases, the conical blank is loaded between the concave die assembly and the expansion block assembly, the equipment drives the upper die plate 7 to move downward and press on the concave die assembly and the expansion block assembly, and then drives the expansion blocks 5 and the concave dies 4 to move downward at the same time, the diameter of the expansion block assembly increases and the diameter of the concave die assembly decreases, until the concave dies 4 and the expansion blocks 5 extrude the blank to be formed, thereby realizing one-step forming of the part by internal expansion and external shrinkage.

[0046] In combination Figure 4 And Figure 5 As shown in the figure, a plurality of first tangent planes 201 are arranged on the inner surface of the outer cone 2, and the concave dies 4 are in sliding cooperation with the first tangent planes 201; a plurality of second tangent planes 601 are arranged on the outer surface of the inner cone 6, and the expansion blocks 5 are in sliding cooperation with the second tangent planes 601. The concave dies 4 and the outer cone 2, and the expansion blocks 5 and the inner cone 6 adopt planar sliding cooperation, which is for the convenience of processing the corresponding planes on the concave dies 4 and the expansion blocks 5, and the corresponding planes of the concave dies 4 and the expansion blocks 5 can be used as the processing reference of other parts; secondly, if a conical surface is adopted, it is not conducive to the sliding of the concave dies 4 and the expansion blocks 5 along the corresponding generatrix.

[0047] In combination Figure 3As shown in the drawings, a plurality of guide plates 8 are arranged on the inner circumferential surface of the outer cone 2 and the outer circumferential surface of the inner cone 6, respectively, and the cross section of the guide plate 8 is T-shaped; a T-shaped slot is arranged on the concave module 4 and the bulging block 5 and is in sliding fit with the guide plate 8. The T-shaped guide plate 8 is in sliding fit with the concave module 4 and the bulging block 5, respectively, and the structure is simple and the sliding is reliable.

[0048] In combination Figure 3 , Figure 6 As shown in the drawings, a let-out slot 301 is arranged on the inner hole surface and the outer circumferential surface of the annular top plate 3, respectively; the position of the let-out slot 301 corresponds to the guide plate 8, and the slot width of the let-out slot 301 is greater than the width of the guide plate 8. When the equipment ejector cylinder drives the ejector rod to lift the annular top plate 3 to move up and down, the let-out slot 301 plays a let-out role to avoid interference between the annular top plate 3 and the guide plate 8.

[0049] In combination Figure 4 , Figure 5 As shown in the drawings, a clamping slot is arranged on the inner circumferential surface of the outer cone 2 and the outer circumferential surface of the inner cone 6, respectively, and the guide plate 8 is installed in the clamping slot 16 and is fixed by a screw. The clamping slot forms a positioning action on the guide plate 8 to ensure the accuracy of the installation position of the guide plate 8.

[0050] In the embodiment, a plurality of first lifting bolts 9 are arranged on the inner hole surface of the inner cone 6; a plurality of second lifting bolts 10 are arranged on the outer circumferential surface of the lower die plate 1; a plurality of third lifting bolts 14 are arranged on the outer circumferential surface of the upper die plate 7; and a plurality of fourth lifting bolts 15 are arranged on the outer circumferential surface of the outer cone 2. By arranging corresponding lifting bolts on the plurality of components, hoisting assembly is facilitated. In addition, a lightening hole is arranged at the center position of the lower die plate 1 and the upper die plate 7, respectively, and the purpose is to reduce the total amount.

[0051] In the embodiment, the upper end and the lower end positions of the inner surface of the concave module 4 are respectively arranged as cylindrical surfaces, that is, A surface and B surface in the drawings, Figure 4 and the upper end and the lower end positions of the outer surface of the bulging block 5 are respectively arranged as cylindrical surfaces, that is, C surface and D surface in the drawings. Figure 5 When the part is bulged, the cylindrical surfaces of the upper end and the lower end of the concave module 4 and the cylindrical surfaces of the upper end and the lower end of the bulging block 5 together form cylindrical surfaces on the upper end and the lower end of the formed part, which facilitates clamping during subsequent laser cutting and positioning and alignment during laser marking.

[0052] The processing method provided by the application not only ensures the part surface precision, but also ensures the part size precision, and realizes efficient processing of the part with quality and quantity guaranteed.

[0053] The above merely describes the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural changes made according to the content of the present application specification and drawings, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A method for processing a bossed oil screen of an aero-engine, the oil screen (100) being a straight-cone cylindrical structure, having two rows of circular platforms (102) on the conical wall, each circular platform having a hole body (101) in the middle, 28 hole bodies (101) being evenly distributed along the circumference, and square bosses (103) being evenly distributed in the middle of the two adjacent rows of circular platforms (102), the square bosses (103) being provided with square notches (104); characterized in that, The method comprises the following steps: Step S1, blanking: the blank diameter is smaller than the part diameter; along the height direction, the large end and the small end of the blank are respectively reserved with a margin; Step S2, bulging: the blank is placed in a bulging die to perform bulging, the bulging die adopts an inner bulging and outer shrinking mode to realize overall forming of the part; the bulging die comprises a lower die plate (1), an outer cone (2) and an inner cone (6) arranged on the lower die plate (1), and a bulging block assembly and a concave die block assembly; the outer cone (2) has an inner circumferential surface in the shape of an inverted cone; the inner cone (6) has an outer circumferential surface in the shape of a normal cone; the bulging block assembly is installed on the outer circumferential surface of the inner cone (6), the bulging block assembly is arranged in an annular array by a plurality of bulging blocks (5), and the bulging block (5) can slide along the generatrix direction of the outer circumferential surface of the inner cone (6); the concave die block assembly is installed on the inner circumferential surface of the outer cone (2), the concave die block assembly is arranged in an annular array by a plurality of concave die blocks (4), and the concave die block (4) can slide along the generatrix direction of the inner circumferential surface of the outer cone (2); Step S3, laser cutting hole and groove: the part is supported and rounded, a hole body (101) is cut on a circular table (102), and a square notch (104) is cut on a square boss (103); Step S4, laser cutting end face: the part is supported and rounded from the inner surface, the small end of the part is clamped on the outer surface, the large end of the part is cut first to ensure the diameter of the large end, and then the small end is cut to ensure the height and the diameter of the small end of the part.

2. A method of machining a bossed oil screen for a gas turbine engine as set forth in claim 1, characterized in that, In step S1, the diameter of the blank is 10-20mm smaller than the diameter of the part, and the large end and the small end of the blank are respectively reserved with a margin of 20-30mm.

3. The method of claim 1 wherein, In step S2, the bulging is performed on a 16000KN hydraulic machine, the main cylinder pressure is 100-120MPa, and the auxiliary cylinder pressure is 80-100MPa.

4. The method of claim 1 wherein, An annular top plate (3) is arranged at the interval between the outer cone (2) and the inner cone (6), and the lower end surfaces of the concave die blocks (4) and the bulging blocks (5) abut against the upper surface of the annular top plate (3); a plurality of top rod holes (13) aligned with the annular top plate (3) are arranged on the lower die plate (1); the top surface of the bulging block assembly is flush with the top surface of the concave die block assembly, and an upper die plate (7) is arranged at the top surface position of the bulging block assembly and the concave die block assembly.

5. A method of machining a bossed oil screen for a gas turbine engine as set forth in claim 4, characterized in that, A plurality of first tangent planes (201) are arranged on the inner circumferential surface of the outer cone (2), and the concave die blocks (4) are in sliding cooperation with the first tangent planes (201); a plurality of second tangent planes (601) are arranged on the outer circumferential surface of the inner cone (6), and the bulging blocks (5) are in sliding cooperation with the second tangent planes (601).

6. A method of machining a bossed oil screen for a gas turbine engine as recited in claim 4, wherein, A plurality of guide plates (8) are respectively arranged on the inner circumferential surface of the outer cone (2) and the outer circumferential surface of the inner cone (6), and the cross section of the guide plate (8) is in the shape of T; T-shaped grooves are respectively arranged on the concave die blocks (4) and the bulging blocks (5) and in sliding cooperation with the guide plates (8).

7. A method of machining a bossed oil screen for a gas turbine engine as set forth in claim 6, characterized in that, A displacement groove (301) is respectively arranged on the inner hole surface and the outer circumferential surface of the annular top plate (3); the position of the displacement groove (301) corresponds to the guide plate (8), and the groove width of the displacement groove (301) is greater than the width of the guide plate (8).

8. A method of machining a bossed oil screen for a gas turbine engine as recited in claim 6, wherein, The guiding plate (8) is installed in the clamping groove (16) and fixed by a screw.

9. A method of machining a bossed oil screen for a gas turbine engine as set forth in claim 4, characterized in that, A plurality of first lifting bolts (9) are arranged on the inner hole surface of the inner cone (6). A plurality of second lifting bolts (10) are arranged on the outer surface of the lower die plate (1). A plurality of third lifting bolts (14) are arranged on the outer surface of the upper die plate (7). A plurality of fourth lifting bolts (15) are arranged on the outer surface of the outer cone (2). Relief holes are arranged at the center positions of the lower die plate (1) and the upper die plate (7).

10. A method of machining a bossed oil screen for a gas turbine engine as recited in claim 4, wherein, The upper end and the lower end of the inner surface of the concave die block (4) are respectively arranged as cylindrical surfaces; and the upper end and the lower end of the outer surface of the bulging block (5) are respectively arranged as cylindrical surfaces.

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