Machining method for special-shaped connecting ring of aero-engine

Abstract

The invention discloses a machining method for a special-shaped connecting ring of an aero-engine. The machining method comprises the following steps that a rectangular raw material is bent into a notch-shaped piece on a bending machine; the notch-shaped piece is rolled and bent in the length direction to form an arc-shaped piece; cutting the arc-shaped piece into a part A from the middle position of the arc-shaped piece; the three parts A are welded into a circular ring piece; performing heat treatment on the circular ring piece to remove stress; the circular ring piece is formed into a shape required by a drawing through a forming mold, and a semi-finished piece is obtained; and cutting holes meeting the requirements of a production drawing on the semi-finished piece until the shapes of the holes meet the requirements of the drawing. According to the invention, the inner expansion flaps and the female dies with different sizes and models are replaced on the forming die, so that the reloading and processing of parts with the part molded surface difference of not more than 30mm are realized, and the purpose of low-cost rapid processing is realized. The forming die is simple in structure, low in manufacturing cost and convenient to popularize and use.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine processing technology, and particularly relates to a processing method for irregularly shaped connecting rings of aero-engines. Background Technology

[0002] like Figure 14 , 15 The irregularly shaped connecting ring shown is a hot-end connecting component on an aero-engine, made of high-temperature alloy. It is a large, hollow structure with a flange, allowing for three butt welds. The axial cross-section is a variable cross-section asymmetric structure, and the angle between the wall and the flange varies. Figure 10 The flange at some locations is smaller than the corresponding location ( Figure 15 The dimensions of the straight wall section are required, and there are holes with high positional accuracy on both the flange and the straight wall. The part surface is based on a digital model, and the flatness is no greater than 1. This part has a novel structure and is extremely difficult to process. It also has various irregularly shaped rings with similar heights and different surface specifications. Therefore, a reasonable and feasible processing method and a common mold structure are needed to achieve low-cost, fast, and stable quality processing of irregularly shaped connecting ring parts. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a method for processing irregularly shaped connecting rings for aero engines.

[0004] The present invention is achieved through the following technical solutions.

[0005] This invention provides a method for processing irregularly shaped connecting rings for aero engines, comprising the following steps: Step 1: Forming, bending the rectangular raw material into a slotted part on a bending machine; Step 2: Roll bending, roll along the length of the grooved part into an arc shape; Step 3: Cutting. Cut the arc-shaped part into part A from the middle position. Step 4: Welding, weld the three parts A into a ring; Step 5: Heat treatment, heat treatment is performed on the ring part to relieve stress; Step 6: Shaping: The ring part is shaped into the shape required by the drawing using a forming mold to obtain a semi-finished part; Step 7: Cutting. Cut the holes required by the production drawings on the semi-finished part, and cut until its shape meets the requirements of the drawings.

[0006] Preferably, the molding die includes: a pressure block, a side push plate, an inner expansion flap, a slider, a support plate, a die, and a pad. The pressure block is disposed inside the side push plate, the side push plate is disposed inside the support plate, the inner expansion flap, the slider, and the die are disposed on the top of the support plate, the outer wall of the inner expansion flap is in contact with the inner wall of the die, the side push plate is located inside the inner expansion flap, the slider is disposed at the bottom of the die, and the pad is disposed at the bottom of the support plate.

[0007] Preferably, the pressure block is provided with a through hole, a connecting seat is provided on the top of the pressure block, the pressure block is shaped like a frustum, and the side wall of the pressure block is provided with a plane.

[0008] Preferably, the side push plate is provided with a slot, the inner side of the side push plate is provided with an inclined surface, and a connecting plate is provided on the side push plate, wherein the outer wall of the connecting plate is in contact with the inner wall of the inner expansion valve.

[0009] Preferably, a first positioning groove is provided at the bottom of the inner expansion flap, and the inner expansion flap is arranged in an arc shape.

[0010] Preferably, the support plate is arranged in a ring shape and has screw holes.

[0011] Preferably, the die is annular, a second positioning groove is provided at the bottom of the die, a guide key is provided in the second positioning groove, and a screw hole is provided on the die.

[0012] Preferably, the slider is fastened to the support plate by screws.

[0013] Preferably, the heat treatment step in step 5 includes holding at 1100-1200℃ for 8-12 minutes, and then removing the ring from the heating environment to allow it to cool at room temperature.

[0014] The beneficial effects of this invention are as follows: This invention enables the machining of parts with surface differences not exceeding 30mm by replacing the inner expansion flap and concave die of different sizes and models on the molding die, achieving the goal of low-cost and rapid processing. This molding die has a simple structure, low manufacturing cost, and is easy to promote and use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the structure of the pressure block of the present invention; Figure 5 This is a schematic diagram of the side push plate of the present invention; Figure 6 This is a schematic diagram of the internal expansion valve structure of the present invention; Figure 7 This is a schematic diagram of the slider of the present invention; Figure 8 This is a schematic diagram of the structure of the support plate of the present invention; Figure 9 This is a schematic diagram of the structure of the concave mold of the present invention; Figure 10 This is a schematic diagram of the irregularly shaped connecting ring of the present invention; Figure 11 yes Figure 10 AA section view; Figure 12 This is a schematic diagram of the slotted part obtained in step 1 of the present invention; Figure 13 This is a schematic diagram of the structure of part A obtained in step 3 of the present invention; Figure 14 This is a schematic diagram of the irregularly shaped connecting ring; Figure 15 This is a schematic diagram of the irregularly shaped connecting ring; In the figure: 1-pressure block, 101-through hole, 102-connecting seat, 2-side push plate, 201-slot, 202-inclined surface, 3-connecting plate, 4-inner expansion flap, 401-first positioning groove, 5-guide key, 6-slider, 7-support plate, 8-screw, 9-die, 901-second positioning groove, 10-pad, 11-straight wall, 12-flange. Detailed Implementation

[0016] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0017] Example 1: like Figures 1 to 15 As shown, where: D=1014mm, H=31.7mm, d1=Φ3.1+0.10, [A1] hole n1=180mm, α=20°, n=18mm, h=15.5mm, L=16.5mm, and the remaining surface dimensions are based on the digital model. After measurement, the included angle between the straight wall 11 and the flange 12 varies from 101° to 69°, and the cross section of the straight wall 11 is a closed linear curve.

[0018] A method for processing irregularly shaped connecting rings for aero engines includes the following steps: Step 1: Forming. The rectangular raw material part is bent into a slotted shape on a bending machine. The formed shape is a slot with a width B = 90mm, a height H1 = 30mm, a bottom transition radius R2, and a length of 1400mm. The bending dimensions, including the slot width B, are greater than 2.3H. The length can be formed in multiple pressings, with the total pressing length greater than 1 / 3 of the part's perimeter plus 100mm. The pressed corner radius can be greater than the final corner radius R1 of the part. Step 2: Roll bending. Roll the slotted part into an arc shape along its length. The equipment used is a three-axis roll bending machine. The roll bending die is a roller. The roller has a convex and concave shape that matches the part's forming shape. The roll bending dimension is the arc radius dimension converted from the arc length of the part's surface. The roll bending radius is R623.5. Step 3: Cutting. Cut the arc-shaped part into an L-shaped part A from the middle position. Cut the two end faces of part A in the length direction. The length dimension is 1 / 3 of the arc length of the part, ensuring that the arc length is 1305mm. Cut the three arc segments together to ensure that the gap between the parts is no more than 0.24mm and the misalignment is no more than 0.08mm. Step 4: Welding. Using a manual argon arc welding machine, the three parts A are welded into a flanged ring by butt welding. The gap between the rings is no more than 0.3mm [A2], and the misalignment is no more than 0.1mm. Remove the burrs and remelted layers produced by cutting. After welding, a kerosene permeability test is required to ensure that there is no kerosene leakage for 5 minutes. Step 5: Heat treatment, heat treatment is performed on the ring part to relieve stress; Step 6: Shaping: The ring part is shaped into the shape required by the drawing using a forming mold to obtain a semi-finished part; the equipment used is a hydraulic press, which is used to place the semi-finished part into the cavity of the forming mold, and the forming mold is used to achieve the processing method of inward pushing and outward clamping to shape the semi-finished part and ensure the surface accuracy of the semi-finished part. Step 7: Cutting. Use a five-axis laser cutting machine to cut holes as required by the production drawings on the semi-finished parts, and cut burrs and other structures until the shape meets the requirements of the drawings. Before cutting, flip the semi-finished part over so that the flange of the semi-finished part is facing upwards, and cut the small holes and outer edge. During cutting, use a copper plate placed at a negative angle for protection to prevent laser debris from damaging the wall of the part. When cutting small holes, use staggered cutting, cutting one small hole every three holes until all holes are processed, and then cut the outer edge of the semi-finished part.

[0019] The forming mold includes: a pressure block 1, a side push plate 2, an inner expansion flap 4, a slider 6, a support plate 7, a die 9, and a pad 10. The pressure block 1 is disposed inside the side push plate 2, which is disposed inside the support plate 7. The inner expansion flap 4, slider 6, and die 9 are disposed on top of the support plate 7. The outer wall of the inner expansion flap 4 is in contact with the inner wall of the die 9. The side push plate 2 is located inside the inner expansion flap 4. The slider 6 is disposed at the bottom of the die 9, and the pad 10 is disposed at the bottom of the support plate 7. Different sizes and models of inner expansion flaps 4 and dies 9 can be replaced to adapt to the processing of different irregularly shaped connecting ring parts.

[0020] The pressure block 1 is provided with a through hole 101, and a connecting seat 102 is provided on the top of the pressure block 1. The pressure block 1 is shaped like a frustum, and the side wall of the pressure block 1 is provided with a plane.

[0021] The side push plate 2 is provided with a slot 201, the inner side of the side push plate 2 is provided with an inclined surface 202, and the side push plate 2 is provided with a connecting plate 3. The outer wall of the connecting plate 3 is in contact with the inner wall of the inner expansion valve 4.

[0022] The inner expansion flap 4 is provided with a first positioning groove 401 at its bottom, and the inner expansion flap 4 is arranged in an arc shape.

[0023] The support plate 7 is arranged in a ring shape, and screw holes are provided on the support plate 7.

[0024] The die 9 is annular, and a second positioning groove 901 is provided at the bottom of the die 9. A guide key 5 is provided in the second positioning groove 901, and a screw hole is provided on the die 9.

[0025] The slider 6 is connected and fastened to the support plate 7 by screws 8.

[0026] The side push plate 2, the inner expansion flap 4, and the pad plate 10 are all arranged in a ring on the horizontal plane in 8 units, and the slider 6 is arranged in 16 units.

[0027] The heat treatment step in step 5 includes holding at 1160°C for 10 minutes, and then removing the ring from the heating environment to allow it to cool at room temperature.

[0028] Before processing, eight outer sliders 6 are inserted into the slots 201 of the side push plate 2 and fixed with screws and pins. The other eight sliders 6 are placed under the side push plate 2 and connected to the support plate 7 with screws. The inner expansion petals 4 are placed on the outer sliders 6 in sequence according to the numbers (No. 4-1, 4-2...) and contact the outer circle of the ring structure formed by the eight side push plates 2. The die 9 is a complete ring structure and is placed on the upper surface of the outer sliders 6. The second positioning groove 901 is aligned with the first positioning groove 401 on the inner expansion petal 4 to achieve positioning.

[0029] During processing, the ring part is placed inside the annular structure formed by the inner expansion petal 4, and the cone 1 is placed on one side of the inner surface of the inclined surface 202 of the side push plate 2. As the hydraulic press drives the cone 1 downward, its outer surface contacts the inclined surface 202 of the side push plate 2 during the downward movement. Then, the side push plate 2 drives the outer slider 6, the inner expansion petal 4, and the ring part to move outward until the ring part contacts the inner wall of the die 9, and the ring part is extruded and formed. During this process, the ring part can automatically find the gap between the expansion petal 4 and the die 9 under the extrusion action, and the semi-finished part is obtained after processing.

[0030] Example 2: A method for processing irregularly shaped connecting rings for aero-engines, based on Example 1, except that its heat treatment step includes holding at 1100°C for 8 minutes.

[0031] Example 3: A method for processing irregularly shaped connecting rings for aero-engines, based on Example 1, differs in that its heat treatment step includes holding at 1200°C for 12 minutes.

Claims

1. A method for processing irregularly shaped connecting rings for aero-engines, characterized in that, Includes the following steps: Step 1: Forming, bending the rectangular raw material into a slotted part on a bending machine; Step 2: Roll bending, roll along the length of the grooved part to form an arc shape; Step 3: Cutting. Cut the arc-shaped part into part A from the middle position. Step 4: Welding; Weld the three parts A into a ring; Step 5: Heat treatment, heat treatment is performed on the ring part to relieve stress; Step 6: Shaping: The ring part is shaped into the shape required by the drawing using a forming mold to obtain a semi-finished part; Step 7: Cutting. Cut the holes required by the production drawings on the semi-finished part, and cut until its shape meets the requirements of the drawings.

2. The processing method for an irregularly shaped connecting ring for an aero-engine as described in claim 1, characterized in that: The forming mold includes: a pressure block (1), a side push plate (2), an inner expansion flap (4), a slider (6), a support plate (7), a cavity mold (9), and a pad (10). The pressure block (1) is located inside the side push plate (2), the side push plate (2) is located inside the support plate (7), the inner expansion flap (4), the slider (6), and the cavity mold (9) are located on the top of the support plate (7), the outer wall of the inner expansion flap (4) is in contact with the inner wall of the cavity mold (9), the side push plate (2) is located inside the inner expansion flap (4), the slider (6) is located at the bottom of the cavity mold (9), and the pad (10) is located at the bottom of the support plate (7).

3. The processing method for an irregularly shaped connecting ring for an aero-engine as described in claim 2, characterized in that: The pressure block (1) is provided with a through hole (101), and a connecting seat (102) is provided on the top of the pressure block (1). The pressure block (1) is provided in the shape of a frustum, and a plane is provided on the side wall of the pressure block (1).

4. The processing method for an irregularly shaped connecting ring for an aero-engine as described in claim 2, characterized in that: The side push plate (2) is provided with a slot (201), the inner side of the side push plate (2) is provided with an inclined surface (202), and the side push plate (2) is provided with a connecting plate (3). The outer wall of the connecting plate (3) is in contact with the inner wall of the inner expansion valve (4).

5. The processing method for an irregularly shaped connecting ring for an aero-engine as described in claim 2, characterized in that: The inner expansion flap (4) is provided with a first positioning groove (401) at the bottom, and the inner expansion flap (4) is arranged in an arc shape.

6. The processing method for an irregularly shaped connecting ring for an aero-engine as described in claim 2, characterized in that: The support plate (7) is arranged in a ring shape, and screw holes are provided on the support plate (7).

7. The processing method for an irregularly shaped connecting ring for an aero-engine as described in claim 2, characterized in that: The die (9) is annular, and a second positioning groove (901) is provided at the bottom of the die (9). A guide key (5) is provided in the second positioning groove (901), and a screw hole is provided on the die (9).

8. The processing method for an irregularly shaped connecting ring for an aero-engine as described in claim 2, characterized in that: The slider (6) is fastened to the support plate (7) by screws (8).

9. The processing method for an irregularly shaped connecting ring for an aero-engine as described in claim 1, characterized in that: The heat treatment step in step 5 includes holding at 1100-1200℃ for 8-12 minutes, and then removing the ring from the heating environment to allow it to cool at room temperature.

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