Processing method of composite fan blade metal edge inner surface processing tooling

Abstract

The application relates to the field of special processing of a composite fan blade metal cover manufacturing method of an airplane engine, and discloses a processing method of a composite fan blade metal cover inner surface processing tool, which comprises a metal cover and a clamp body, the cross section of the metal cover is U-shaped, one side of the metal cover close to a center point is a processing surface, and the other side of the metal cover far from the center point is an electrochemical blank processed surface; a strip-shaped groove is arranged on the clamp body and is attached to the metal cover; and the inner wall of the strip-shaped groove is a positioning surface. The processing method of the composite fan blade metal cover inner surface processing tool can complete the core body rough machining, the thin wall edge semi-finishing and the finishing of the inner surface of the metal cover through one set of tooling.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of special processing of aircraft engine composite fan blade metal banding manufacturing method, in particular to the processing method of the processing tool of the inner surface of the composite fan blade metal banding. BACKGROUND

[0002] With the development of aircraft engine technology, the geometry of the composite fan blade metal banding is more and more complex, and various processing methods have emerged due to the characteristics of thin-walled difficult-to-machine materials, the goal is to solve the problem of generation efficiency and processing deformation. Snecma (CN 103429780 B and CN 102947596 B) respectively adopts hot isostatic pressing method and die forging method to form the inner and outer surfaces of the metal banding; Saifeng aircraft engine company (CN 106460220 B) adopts micro-arc oxidation to generate the inner surface pit features of the metal banding; Barnes group (US009222362) and Shanghai Liangcheng (CN 210714788 U) propose to manufacture the metal banding by welding; Aviation Manufacturing Technology Research Institute (CN 109202373A) adopts additive manufacturing to generate the metal banding blank; China Aviation (CN 104404613 A) proposes to process the outer surface and inner surface of the metal banding by electrolytic forming. The above-mentioned methods for generating metal banding need to be based on a large number of experiments and trials to solve the problem of deformation of the thin-walled edge, and they are mainly single process. Therefore, we propose a processing method for the processing tool of the inner surface of the composite fan blade metal banding. SUMMARY

[0003] In view of the shortcomings of the prior art, the present application provides a processing method for the processing tool of the inner surface of the composite fan blade metal banding, which solves the above-mentioned problems.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a processing method for the processing tool of the inner surface of the composite fan blade metal banding, characterized in that the processing tool of the inner surface of the composite fan blade metal banding comprises a metal banding and a clamping body, the cross section of the metal banding is U-shaped, one side of the metal banding close to the center point is a processing surface, and the other side of the metal banding away from the center point is an electrochemical blank processed surface; the clamping body is provided with a strip-shaped groove matched with the metal banding, and the inner wall of the strip-shaped groove is a positioning surface.

[0005] The clamping body is provided with a clamping hole on both sides;

[0006] The clamping body is provided with a clamping hole on both sides;

[0007] The processing method comprises the following steps:

[0008] First step: clamping, clamping the electrochemical machining blank to the fixture;

[0009] Second step: electrochemical sleeve machining of the electrochemical machining blank clamped on the fixture to obtain an electrochemical grinding blank;

[0010] Third step: electrochemical grinding of the electrochemical grinding blank to obtain a to-be-micro-etched blank and prepare an electrochemical corrosion transition piece;

[0011] Fourth step: cutting off the two process bosses, process boss one and process boss two, of the electrochemical corrosion transition piece with a wire cutting to obtain a finished part metal edge.

[0012] Preferably, the electrochemical sleeve machining in the second step includes the following steps:

[0013] S1: connecting process boss one and sleeve electrode to the positive and negative poles of the electrochemical sleeve machining power supply, respectively;

[0014] S2: the sleeve electrode approaches the end face of process boss two from the sleeve machining cut-out position, while the sleeve machining electrolyte interface flows out from the sleeve electrode, the sleeve electrode moves along the sleeve movement trajectory at an electrochemical machining feed speed of 1-3 mm / min to the sleeve machining cut-out position, the sleeve core is gradually machined out, and the sleeve electrode is inserted into support pin one and support pin two during movement;

[0015] S3: continue to move the sleeve electrode to the sleeve machining cut-out position and further cut out from the process boss, remove support pin one and support pin two, remove the sleeve core, complete the electrochemical sleeve machining, and generate an electrochemical grinding blank.

[0016] Preferably, the step of inserting support pin one and support pin two is: when the sleeve electrode movement position exceeds process support hole two, insert support pin two and pass through process support hole two;

[0017] When the sleeve electrode moves to a position exceeding process support hole one, insert support pin one and pass through process support hole one.

[0018] Preferably, the electrochemical grinding machining in the third step includes the following steps:

[0019] S1: the positive pole of the electrochemical grinding machining power supply is connected to the electrochemical grinding blank, and the negative pole is connected to the finger electrode;

[0020] S2: when the finger electrode moves forward along the electrode movement trajectory one to the electrochemical grinding cut-out position, the inner surface of one side of the electrochemical grinding blank is gradually machined, and when the electrochemical grinding cut-out position moves along the electrode movement trajectory two to the electrochemical grinding cut-in position, the other side of the metal surface is machined to obtain a to-be-micro-etched blank.

[0021] Preferably, the electrode movement trajectory one and the electrode movement trajectory two can be reciprocating to process the two side surfaces respectively, or zigzag or spiral to alternately process the two side surfaces.

[0022] Preferably, the electrochemical corrosion transition piece is processed by electrochemical corrosion processing.

[0023] Preferably, the electrochemical corrosion processing comprises the following steps:

[0024] S1: the positive pole of the electrochemical corrosion parameter power supply is connected to the process boss two of the to-be-roughened blank, and the negative pole is connected to the simple-shaped tool electrode;

[0025] S2: the tool electrode traverses the two side surfaces of the to-be-roughened blank according to the movement trajectory, the tool electrode and the two side surfaces of the to-be-roughened blank are filled with flowing electrochemical solution, and finally the electrochemical corrosion transition piece is generated.

[0026] Preferably, the electrochemical corrosion processing comprises the following steps:

[0027] S1: a layer of mask is covered on the to-be-roughened blank before processing, and the non-processing surface is protected from corrosion;

[0028] S2: the positive pole of the electrochemical corrosion parameter power supply is connected to the process boss two of the to-be-roughened blank, and the negative pole is connected to the tool electrode;

[0029] S3: when the to-be-roughened blank covered with the mask, the tool electrode and the clamp body are immersed in the flowing electrochemical solution, the surface of the to-be-roughened blank produces a pit feature, and finally the electrochemical corrosion transition piece is generated.

[0030] Compared with the prior art, the present application provides a processing method of a composite fan blade metal edge inner surface processing tool, which has the following beneficial effects:

[0031] 1. The processing method of the composite fan blade metal edge inner surface processing tool completes the core removal rough machining, the thin-walled edge semi-finishing and the finishing of the metal edge inner surface through a set of tooling.

[0032] 2. The processing method of the composite fan blade metal edge inner surface processing tool is non-cutting force processing, the workpiece has small stress deformation, the geometric precision requirement is easy to ensure, and the production efficiency is high. DETAILED DESCRIPTION

[0033] Figure 1 Electrochemical sleeve rough machining schematic diagram;

[0034] Figure 2 Sleeve core forming process schematic diagram;

[0035] Figure 3Electrochemical grinding semi-finishing, finishing schematic diagram;

[0036] Figure 4 Electrochemical corrosion processing schematic diagram.

[0037] In the figure: 1, process support hole one; 2, electrochemical blank processed surface; 3, process support hole two; 4, process boss one; 5, process boss two; 6, flow liquid port; 7, sleeve processing electrolyte; 8, electrolyte interface; 9, sleeve electrode; 10, support pin two; 11, sleeve movement trajectory; 12, clamp air hole; 13, vacuum clamping; 14, support pin one; 15, clamp body; 16, positioning surface; 17, electrochemical grinding processing electrolyte; 18, rotation direction; 19, finger electrode; 20, finger electrode liquid outlet; 21, finger electrode liquid; 22, electrode movement trajectory one; 23, electrode movement trajectory two; 24, metal edge inner surface bottom groove; 25, tool electrode; 26, electrochemical solution; 100, electrochemical processing blank; 101, sleeve core; 102, electrochemical grinding blank; 103, to be textured blank; 104, electrochemical corrosion transition piece; 105, metal edge; 200, electrochemical sleeve processing power supply; 201, electrochemical grinding processing power supply; 202, electrochemical corrosion parameter power supply; 300, sleeve processing cut-in; 301, sleeve processing cut-out; 400, electrochemical sleeve processing; 500, electrochemical grinding processing; 501, electrochemical grinding cut-out; 502, electrochemical grinding cut-in; 600, electrochemical corrosion processing. DETAILED DESCRIPTION

[0038] 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. 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.

[0039] Please refer to Figures 1-4 , the processing method of the composite fan blade metal edge inner surface processing tool, the composite fan blade metal edge inner surface processing tool, comprising a metal edge 105 and a clamp body 15, the cross section of the metal edge 105 is U-shaped, one side of the metal edge 105 close to the center point is a processing surface, the other side of the metal edge 105 away from the center point is an electrochemical blank processed surface 2, a strip-shaped groove is formed on the clamp body 15 and matched with the metal edge 105, and the inner wall of the strip-shaped groove is a positioning surface 16;

[0040] The clamp body 15 is provided with a clamp air hole 12 on each side;

[0041] The clamp body 15 is provided with a support pin two 10 and a support pin one 14 at two ends, respectively.

[0042] Three groups of rectangular grooves are arranged on the inner walls of the two sides of the bar groove.

[0043] The processing method comprises the following steps:

[0044] First step: clamping, clamping the electrochemical machining blank 100 to the clamping body 15;

[0045] Second step: rough machining, semi-finishing and finishing of the electrochemical machining blank 100 clamped on the clamping body 15 to obtain the to-be-machined blank 103;

[0046] The steps of obtaining the to-be-machined blank 103 are as follows:

[0047] S1: connecting the process boss one 4 and the sleeve electrode 9 to the positive and negative poles of the electrochemical sleeve machining power source 200 respectively;

[0048] S2: the sleeve electrode 9 approaches the end face of the process boss two 5 from the sleeve machining cut-in 300 position, and at the same time, the sleeve machining electrolyte interface 8 flows out from the sleeve electrode 9, so that the electrochemical anode dissolution occurs at the end face of the process boss two 5, and the etched shape is similar to the end face of the sleeve electrode 9; when the sleeve electrode 9 moves to the sleeve machining cut-out 301 position along the sleeve movement track 11 at the electrochemical machining feeding speed (generally 1~3mm / min), the sleeve core body 101 is gradually machined out; in order to prevent the sleeve core body 101 from being deformed and drooping due to weight at the cut-in position, when the movement position of the sleeve electrode 9 exceeds the position of the process support hole two 3, the support pin two 10 is inserted and passes through the process support hole two 3;

[0049] S3: when the sleeve electrode 9 moves to the position exceeding the process support hole one 1, the support pin one 14 is inserted; when the sleeve electrode 9 continues to move to the sleeve machining cut-out 301 position and further cuts out from the process boss one 4, the complete sleeve core body 101 is separated from the electrochemical machining blank 100; the support pin one 14 and the support pin two 10 are taken out, the sleeve core body 101 is removed, the electrochemical sleeve machining is completed, and the electrochemical grinding blank 102 is generated;

[0050] S4: the positive pole of the electrochemical grinding power supply 201 is connected to the electrochemical grinding blank 102, and the negative pole is connected to the finger-shaped electrode 19. The rotating finger-shaped electrode 19 always has working liquid flowing out of the finger-shaped electrode liquid outlet 20 at a certain flow rate and pressure in the working state. When the electrochemical grinding power supply 201 is loaded to the positive and negative poles, and when the inner surface of the electrochemical grinding blank 102 approaches the finger-shaped electrode, electrochemical corrosion or a small amount of spark discharge will occur, and etching particles will be generated. The working liquid flowing out of the finger-shaped electrode liquid outlet 20 can flush the etching particles away from the corrosion or discharge area, and at the same time, it can cool the electrode and the workpiece. When the finger-shaped electrode 19 moves forward along the electrode movement trajectory one 22 to the electrochemical grinding cutting-out 501 position, the inner surface of one side of the electrochemical grinding blank 102 is gradually processed. When the electrochemical grinding cutting-out 501 position moves along the electrode movement trajectory two 23 to the electrochemical grinding cutting-in 502 position, the other side of the metal surface is processed. Thus, the prepared to-be-matted blank 103 is obtained, and the inner surface bottom groove 24 is completed by electrochemical forming processing or traditional milling processing. The electrode movement trajectory one 22 and the electrode movement trajectory two 23 can be reciprocating to process the two sides respectively, or zigzag or spiral to continuously alternate processing the two sides.

[0051] Step 3: preparing the finished part metal cover 105 by electrochemical corrosion processing 600.

[0052] The electrochemical corrosion processing 600 includes the following two methods:

[0053] The positive pole of the electrochemical corrosion parameter power supply 202 receives the process boss two 5 of the to-be-matted blank 103, and the negative pole receives the simple-shaped tool electrode 25. When the power supply is powered on, the tool electrode 25 traverses the two sides of the to-be-matted blank 103 according to a certain movement trajectory, and at the same time, the tool electrode 25 and the two sides of the to-be-matted blank 103 are filled with flowing electrochemical solution 26. In this way, under the action of electrochemical corrosion, the surface of the to-be-matted blank 103 produces a pit feature topography, and finally generates the electrochemical corrosion transition piece 104. The to-be-matted blank 103 is cut off by a wire cutting machine, and the parts of the process boss one 4 and the process boss two 5 of the electrochemical corrosion transition piece 104 are obtained. The finished part metal cover 105 is obtained.

[0054] A mask is coated on the surface of the to-be-roughened blank 103 before processing, and the non-processing surface is protected from corrosion. The mask has certain hole characteristics, so that the area under the surface of the coated to-be-roughened blank 103 corresponding to these hole characteristics is exposed to the electrochemical solution 26 during the electrochemical corrosion processing 600. The positive electrode of the electrochemical corrosion parameter power supply 202 is connected to the process boss two 5 of the to-be-roughened blank 103, and the negative electrode is connected to the tool electrode 25. When the power supply is powered on, the to-be-roughened blank 103 coated with the mask, the tool electrode 25 and the clamp body 15 are immersed in the flowing electrochemical solution 26, the surface of the to-be-roughened blank 103 produces a pit feature morphology, and finally generates the electrochemical corrosion transition piece 104. The two process bosses one 4 and the process boss two 5 of the electrochemical corrosion transition piece 104 are cut off by wire cutting, and the finished part metal cover 105 is obtained.

[0055] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A processing method of a composite fan blade metal edge inner surface processing tooling, characterized in that, The utility model provides a composite fan blade metal edge covering inner surface processing frock, including metal edge covering (105) and clamping concrete (15), its characterized in be: metal edge covering (105) cross section is U shape, metal edge covering (105) is close to the side of center point one side and is processing surface, metal edge covering (105) is far from the side of center point one side and is electrochemical blank processed surface (2), clamping concrete (15) is set up with metal edge covering (105) and is combined strip groove, and the inner wall of strip groove is positioning surface (16); Both sides of the clamping concrete (15) are provided with clamp air holes (12); Both ends of the clamping concrete (15) are respectively provided with support pin two (10) and support pin one (14), and three groups of rectangular grooves are formed in the inner walls of both sides of the strip groove. The processing method comprises the following steps: First step: clamping, the electrochemical machining blank (100) is clamped on the clamping concrete (15); Second step: the electrochemical sleeve processing (400) is used to process the electrochemical machining blank (100) clamped on the clamping concrete (15) to obtain the electrochemical grinding blank (102); Third step: the electrochemical grinding processing (500) is used to process the electrochemical grinding blank (102) to obtain the to-be-mattified blank (103), and the electrochemical corrosion transition piece (104) is prepared; Fourth step: the wire cutting is used to cut off the two edge process bosses (4) and (5) of the electrochemical corrosion transition piece (104) to obtain the finished part metal edge covering (105).

2. The method of claim 1, wherein: The electrochemical sleeve processing (400) in the second step comprises the following steps: S1: the process boss one (4) and the sleeve electrode (9) are respectively connected to the positive electrode and the negative electrode of the electrochemical sleeve processing power supply (200); S2: the sleeve electrode (9) approaches the end face of the process boss two (5) from the sleeve processing cutting (300) position, and the sleeve processing electrolyte interface (8) flows out from the sleeve electrode (9), the sleeve electrode (9) moves along the sleeve movement track (11) at the electrochemical processing feed speed of one to three mm / min to the sleeve processing cutting (301) position, the sleeve core (101) is gradually processed out, and the sleeve electrode (9) is inserted into the support pin one (14) and the support pin two (10) during the movement; S3: continue to move the sleeve electrode (9) to the sleeve processing cutting (301) position and further cut out from the process boss one (4), take out the support pin one (14) and the support pin two (10), remove the sleeve core (101), complete the electrochemical sleeve processing, and generate the electrochemical grinding blank (102).

3. The method of claim 2, wherein: The step of inserting the support pin one (14) and the support pin two (10) is that when the sleeve electrode (9) moves to a position beyond the process support hole two (3), the support pin two (10) is inserted and passes through the process support hole two (3); When the sleeve electrode (9) moves to a position beyond the process support hole one (1), the support pin one (14) is inserted and passes through the process support hole one (1).

4. The method of claim 1, wherein: The electrochemical grinding processing (500) in the third step comprises the following steps: S1: the positive pole of the electrochemical grinding power supply (201) is connected with the electrochemical grinding blank (102), and the negative pole is connected with the finger-shaped electrode (19); S2: when the finger-shaped electrode (19) moves forward along the electrode movement track one (22) to the electrochemical grinding cutting-out (501) position, the inner surface on one side of the electrochemical grinding blank (102) is gradually processed, and when the electrochemical grinding cutting-out (501) position moves along the electrode movement track two (23) to the electrochemical grinding cutting-in (502) position, the other side of the metal surface is processed, thereby obtaining the to-be-mattified blank (103); The electrode movement track one (22) and the electrode movement track two (23) can be reciprocating to process two sides respectively, or can be zigzag or spiral to alternately process two sides.

5. The method of claim 1, wherein: The electrochemical corrosion transition piece (104) is processed by electrochemical corrosion processing (600) on the to-be-mattified blank (103).

6. The method of claim 5, wherein: The electrochemical corrosion processing (600) includes the following steps: S1: the positive pole of the electrochemical corrosion parameter power supply (202) is connected with the process boss two (5) of the to-be-mattified blank (103), and the negative pole is connected with the simple-shaped tool electrode (25); S2: the tool electrode (25) traverses two sides of the to-be-mattified blank (103) according to the movement track, at the same time, the tool electrode (25) and the two sides of the to-be-mattified blank (103) are filled with flowing electrochemical solution (26), and finally the electrochemical corrosion transition piece (104) is generated.

7. The method of claim 5, wherein: The electrochemical corrosion processing (600) includes the following steps: S1: before processing, a layer of mask is covered on the to-be-corroded surface of the to-be-mattified blank (103), and the non-processing surface is protected from corrosion; S2: the positive pole of the electrochemical corrosion parameter power supply (202) is connected with the process boss two (5) of the to-be-mattified blank (103), and the negative pole is connected with the tool electrode (25); S3: when the to-be-mattified blank (103) covered with the mask, the tool electrode (25) and the clamp body (15) are immersed in the flowing electrochemical solution (26), the surface of the to-be-mattified blank (103) generates a pit feature topography, and finally the electrochemical corrosion transition piece (104) is generated.

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