Forming method of barrel with boss

Abstract

The invention relates to the technical field of aero-engine manufacturing, in particular to a forming method of a barrel with a boss, which comprises the following steps: S1, laser blanking: performing laser two-dimensional blanking on a plate to obtain a fan-shaped blank; s2, edge rolling and welding are conducted, specifically, the fan-shaped blank is subjected to edge rolling and then welded, and the conical cylinder is obtained; s3, vacuum heat treatment is conducted, specifically, vacuum heat treatment is conducted on the conical cylinder, and welding stress is removed; s4, forming is conducted, specifically, bulging is conducted through a bulging die, and a bulging part is obtained; s5, laser cutting is conducted, specifically, the bulging part is machined through laser cutting, and a cone inner barrel part is obtained; and S6, fluorescence detection: carrying out fluorescence detection on the cone inner cylinder part obtained in the step S5. The cone inner cylinder part is obtained by integrally bulging the cone cylinder, so that the problems that wrinkles exist, the quality of the formed surface is poor and welding deformation is difficult to control due to the fact that split profiling and welding are adopted in the traditional process are effectively solved. The machining period of the cone inner cylinder part is shortened, and meanwhile the forming quality of the cone inner cylinder part is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engine manufacturing, and in particular to a molding method of a barrel with a boss. Background Art

[0002] The cone inner cylinder part 300 is an internal cylinder part of the inner cone of an aircraft engine. The final height of the part is H, the outer diameter of the small end is φD2, the outer diameter of the large end boss is φD1, and the mouth of the large end boss is folded inward to form a through hole with a diameter of φD3. A through hole of 32-φA is processed on the side wall of the small end of the part. The transition cone angle between the small end of the part and the large end boss is α. Its overall structure is a body of revolution structure, which is a typical thin-walled cylinder part with a boss. The cross-sectional structure of the cone inner cylinder part is as follows: Figure 1 As shown, the three-dimensional structure is Figure 2 shown.

[0003] At present, the cone inner cylinder is processed by the process route of 1 / 3 petal pressing-matching cutting-welding-correction-laser cutting. The parts are prone to wrinkles during petal pressing, and the surface quality of the molding is poor. The wrinkled position needs to be knocked and repaired before welding. The welding is accompanied by the surface during welding, which is difficult to control the welding deformation of the parts. After welding, the welding deformation of the parts is corrected by tooling, and the processing efficiency of the parts is low. In order to improve the processing efficiency of the parts and ensure the quality of the molding surface of the parts, a molding method of a cylinder with a boss is proposed. Summary of the invention

[0004] The main purpose of the present invention is to provide a forming method of a cylinder with a boss, aiming to solve the above technical problems.

[0005] To achieve the above object, on the one hand, the present invention provides a method for forming a cylindrical body with a boss, comprising the following steps:

[0006] S1. Laser cutting: Use sheet material for two-dimensional laser cutting to obtain fan-shaped rough material;

[0007] S2, rolling and welding: rolling the fan-shaped raw material and then welding it to obtain a cone;

[0008] S3, vacuum heat treatment: vacuum heat treatment of the cone to remove welding stress;

[0009] S4, forming: using a bulging die to bulge to obtain a bulged part;

[0010] S5, laser cutting: laser cutting is used to process the bulging parts to obtain the cone inner cylinder parts;

[0011] S6, fluorescence detection: perform fluorescence detection on the cone inner cylinder part obtained in step S5.

[0012] Preferably, the thickness of the sheet material used is 1.2 mm.

[0013] Preferably, in step S5, the laser cutting processing parts include: laser cutting the small end face to ensure the height H of the cone inner cylinder part, and laser cutting the φD3 through hole at the large end portion of the part, and the 32-φA through hole on the small end side wall.

[0014] Preferably, the outer diameter of the small end of the conical inner cylinder part is φD2, and the outer diameter of the large end boss is φD1; the outer diameter of the large end of the cone obtained in step S2 is φB, and the outer diameter of the small end is φA, and the bulging amount of the large end and the small end of the cone meets the following requirements: φD1-φB=30mm; φD2-φA=20mm.

[0015] Preferably, a cone is formed by rolling and welding two pieces of fan-shaped raw materials.

[0016] Preferably, in step S4, the bulging mold used includes a lower mold plate and an upper mold plate; a guide plate is arranged on the top surface of the lower mold plate, a first annular die is arranged on the top surface of the guide plate, and a flaring section is arranged at the mouth of the inner hole of the first die; a plurality of expansion petals are slidably mounted on the guide plate, and an arc-shaped protrusion is arranged on the upper part of the outer cylindrical surface of the expansion petal; a second annular die and a cone are arranged on the bottom surface of the upper mold plate; when the molds are closed, the lower end surface of the second die abuts against the top surface of the first die; the inclined surface of the cone cooperates with the inclined surface of the expansion petal, and the expansion petal moves radially outward, so that the arc-shaped protrusion of the expansion petal penetrates into the annular groove formed by the lower end surface of the second die and the flaring section of the first die.

[0017] Preferably, a guide column is provided on the lower template, and a guide sleeve is provided on the upper template, and the upper portion of the guide column is slidably inserted in the inner hole of the guide sleeve.

[0018] Preferably, a plurality of rectangular sliding holes are evenly distributed in an annular pattern on the guide plate, and a guide block is slidably installed in each rectangular sliding hole; a guide block is installed at the bottom of each expansion petal by means of screws; and the guide block is slidably installed in the rectangular sliding hole.

[0019] Preferably, a through hole is opened on the side of the guide plate, each rectangular sliding hole is correspondingly provided with a through hole, and the through hole is connected with the rectangular sliding hole; an internal thread is provided on the through hole; a blind hole is provided on the guide block; a spring is provided in the through hole of the guide plate, and the inner end of the spring is inserted in the blind hole of the guide block; a screw plug is screwed on the through hole for tightening the spring, and the spring is always in a compressed energy storage state.

[0020] Preferably, in step S4, the bulging process using a bulging die comprises the following steps:

[0021] S401, installing the bulging die on the hydraulic press, fixing the upper die plate on the pressing plate of the hydraulic press, and fixing the lower die plate on the working table of the hydraulic press;

[0022] S402, the hydraulic press drives the upper mold plate upward, so that the cone and the expansion petals are separated, and the guide block is pushed radially inward by the action of the spring, so that all the expansion petals are reset;

[0023] S403, sleeve the de-stressed cone on all the expansion petals, with the small end of the cone facing downward;

[0024] S404, using a hydraulic press to drive the upper mold plate downward, the inclined surface of the cone is matched with the inclined surface of the expansion flap, and the expansion flap moves radially outward, and the inner surface of the first concave mold, the bottom surface of the second concave mold, the outer surface and the top surface of the expansion flap are used to bulge the cone;

[0025] S405. After pressure maintenance, the upper mold plate is driven upward by a hydraulic press, the cone is separated from the expansion petals, and the guide block is pushed radially inward by the action of the spring, so that all the expansion petals are reset, and the expanded parts can be taken out.

[0026] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0027] (1) In the present invention, a cone-shaped cylinder is used for overall bulging to obtain a cone-shaped inner cylinder part, which effectively overcomes the problems of wrinkles, poor molding surface quality, and difficult to control welding deformation in the traditional process of using split-flap pressing and welding. The processing cycle of the cone-shaped inner cylinder part is shortened, while the molding quality of the cone-shaped inner cylinder part is guaranteed. The processing method provided by the present invention is more reliable, and the processed parts have better consistency and higher quality.

[0028] (2) In the present invention, a spring reset structure is provided in the bulging die used. After the cone is separated from the bulging petals, the spring pushes the guide block to move radially inward, so that all the bulging petals are reset and the bulged parts can be taken out. Therefore, the spring reset structure facilitates the removal of the bulged parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 It is a schematic structural diagram of the cone inner cylinder part in the present invention;

[0031] Figure 2It is a three-dimensional structural diagram of the cone inner cylinder part in the present invention;

[0032] Figure 3 It is a structural schematic diagram of the bulging die in the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the fan-shaped wool material in the present invention;

[0034] Figure 5 This is a schematic diagram of a cone structure obtained by rolling and welding the fan-shaped raw material in the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of the lower template in the bulging die;

[0036] Figure 7 It is a schematic diagram of the structure of the guide plate in the bulging die;

[0037] Figure 8 for Figure 7 Cross-sectional view of CC;

[0038] Fig. 9 is a cross-sectional view of a first concave die in a bulging die;

[0039] Fig.10 for Fig. 9 Schematic diagram of hole position distribution in the A-axis view;

[0040] Fig.11 A top view of a guide block in a bulging die;

[0041] Fig.12 for Fig.11 Middle DD section view;

[0042] Fig.13 It is a partial top view of the expansion flap in the expansion die;

[0043] Fig.14 for Fig.13 Sectional view of EE;

[0044] Fig.15 is a top view of the second concave die in the bulging die;

[0045] Fig.16 for Fig.15 Cross-sectional view of the middle FF;

[0046] Fig.17 It is a schematic diagram of the structure of the upper template in the bulging die;

[0047] Fig.18 A partial top view of the cone in the bulging die

[0048] Fig.19 for Fig.18Sectional view of II.

[0049] Explanation of the accompanying drawings: 1. Lower template; 2. Guide plate; 2a. Rectangular sliding hole; 2b. Through hole; 3. First die; 3a. Conical section; 3b. Cylindrical section; 3c. Screw hole; 3d. Pin hole; 4. Guide block; 4a. Blind hole; 5. Expansion flap; 5a. Arc-shaped protrusion; 6. Second die; 7. Upper template; 8. Cone; 9. First lifting bolt; 10. Screw plug; 12. Guide column; 14. Guide sleeve; 15. Second lifting bolt; 16. First cylindrical pin; 17. First screw; 18. Second cylindrical pin; 19. Second screw; 20. Spring; 21. Third screw; 100. Fan-shaped rough material; 200. Conical cylinder; 300. Conical inner cylinder part. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0052] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] As shown in the accompanying drawings, a method for forming a cylindrical body with a boss includes the following steps:

[0054] S1, laser blanking: using a sheet material with a thickness of 1.2 mm to perform two-dimensional laser blanking to obtain a fan-shaped rough material 100;

[0055] S2, rolling and welding: rolling the sector-shaped raw material 100 and then welding it to obtain a cone 200;

[0056] S3, vacuum heat treatment: vacuum heat treatment is performed on the cone 200 to remove welding stress;

[0057] S4, forming: using a bulging die to bulge to obtain a bulged part;

[0058] S5, laser cutting: the bulging part is processed by laser cutting to obtain the cone inner cylinder part 300;

[0059] S6. Fluorescence detection: Perform fluorescence detection on the cone inner cylinder part 300 obtained in step S5.

[0060] Combination Figure 1 As shown, in step S5, the parts to be laser cut include: laser cutting the small end face to ensure the height H of the cone inner cylinder part 300, and laser cutting the φD3 through hole at the large end portion of the part, and the 32-φA through hole on the small end side wall.

[0061] Combination Figure 4 As shown, the upper and lower sides of the fan-shaped raw material 100 are arc-shaped sides R1 and R2 respectively, and the included angle of the straight sides is β.

[0062] Combination Figure 1 , Figure 5 As shown, the outer diameter of the small end of the cone inner cylinder part 300 is φD2, and the outer diameter of the large end boss is φD1; the large end outer diameter of the cone cylinder 200 obtained in step S2 is φB, and the small end outer diameter is φA, and the bulging amount of the large end and the small end of the cone cylinder 200 meets the following requirements: φD1-φB=30mm; φD2-φA=20mm. By setting a reasonable bulging amount, wrinkles can be avoided during bulging.

[0063] In this embodiment, in order to reduce the difficulty of cutting, a cone 200 is formed by rolling and welding two fan-shaped raw materials 100. If one fan-shaped raw material 100 is rolled and welded, the raw material is too long and the cutting difficulty is large.

[0064] Combination Figure 3As shown, in step S4, the bulging die used includes a lower template 1 and an upper template 7; a guide plate 2 is arranged on the top surface of the lower template 1, a first annular die 3 is arranged on the top surface of the guide plate 2, and a flaring section is arranged at the mouth of the inner hole of the first die 3; a plurality of expansion petals 5 are slidably mounted on the guide plate 2, and an arc-shaped protrusion 5a is arranged on the upper part of the outer cylindrical surface of the expansion petal 5; a second annular die 6 and a cone 8 are arranged on the bottom surface of the upper template 7. Specifically, the second die 6 and the upper template 7 are fastened together by screws and a first cylindrical pin 16, and the cone 8 and the upper template 7 are fastened together by a cylindrical pin and a first screw 17. The first die 3 and the guide plate 2 are fastened together by a third screw 21 and a cylindrical pin. The lower template 1 and the guide plate 2 are fastened together by screws and cylindrical pins.

[0065] When the molds are closed, the lower end surface of the second die 6 abuts against the top surface of the first die 3; the inclined surface of the cone 8 cooperates with the inclined surface of the expansion petal 5, and the expansion petal 5 moves radially outward, so that the arc-shaped protrusion 5a of the expansion petal 5 penetrates into the annular groove formed by the lower end surface of the second die 6 and the flared section of the first die 3.

[0066] Combination Fig. 9 , Fig.10 As shown, the flaring section of the first die 3 includes a conical section 3a and a cylindrical section 3b, the conical section 3a is used to form the transition conical surface between the small end and the large end boss of the conical inner cylinder part 300, and the cylindrical section 3b is used to form the outer cylindrical surface of the large end boss φD1. The first die 3 is provided with a pin hole 3d and a screw hole 3c.

[0067] In order to facilitate the lifting of the mold, four first lifting bolts 9 are evenly distributed on the outer peripheral surface of the lower template 1. Four second lifting bolts 15 are also evenly distributed on the outer peripheral surface of the upper template.

[0068] Combination Figure 3 As shown, a guide column 12 is provided on the lower template 1 , and a guide sleeve 14 is provided on the upper template 7 . The upper portion of the guide column 12 is slidably inserted into the inner hole of the guide sleeve 14 .

[0069] In this embodiment, a plurality of rectangular sliding holes 2a are evenly distributed in an annular pattern on the guide plate 2, and a guide block 4 is slidably installed in each rectangular sliding hole 2a; a guide block 4 is installed at the bottom of each expansion petal 5 by screws; and the guide block 4 is slidably installed in the rectangular sliding hole 2a. Specifically, the guide block 4 and the expansion petal 5 are fastened and connected by a second cylindrical pin 18 and a second screw 19. Further, a through hole 2b is provided on the side of the guide plate 2, and each rectangular sliding hole 2a is correspondingly provided with a through hole 2a, and the through hole 2a is connected with the rectangular sliding hole 2a; an internal thread is provided on the through hole 2a; a blind hole 4a is provided on the guide block 4; a spring 20 is provided in the through hole 2a of the guide plate 2, and the inner side end of the spring 20 is inserted in the blind hole 4a of the guide block 4; a screw plug 10 is screwed on the through hole 2a to tighten the spring 20, and the spring 20 is always in a compressed energy storage state.

[0070] In step S4, the bulging process using the bulging die includes the following steps:

[0071] S401, installing the bulging die on the hydraulic press, fixing the upper template 7 on the pressing plate of the hydraulic press, and fixing the lower template 1 on the working table of the hydraulic press;

[0072] S402, the hydraulic press drives the upper mold plate 7 upward, so that the cone 8 is separated from the expansion petals 5, and the guide block 4 is pushed radially inward under the action of the spring 20, so that all the expansion petals 5 are reset;

[0073] S403, sleeve the de-stressed cone 200 on all the expansion petals 5, with the small end of the cone 200 facing downward;

[0074] S404, using a hydraulic press to drive the upper mold plate 7 downward, the inclined surface of the cone 8 matches the inclined surface of the expansion flap 5, and the expansion flap 5 moves radially outward, and the inner surface of the first die 3, the bottom surface of the second die 6, the outer surface and the top surface of the expansion flap 5 are used to expand the cone 200; during forming, the second die 6 moves downward, the expansion flap 5 moves radially outward, and the top surface of the arc-shaped protrusion 5a of the expansion flap 5 and the second die 6 work together to make the mouth of the large end boss of the part fold inward. The arc-shaped protrusion 5a of the expansion flap 5 penetrates into the annular groove formed by the lower end surface of the second die 6 and the flared section of the first die 3, and the cylinder forms the large end boss on the part.

[0075] S405, after pressure maintenance, the upper mold plate 7 is driven upward by a hydraulic press, the cone 8 is separated from the expansion petals 5, and the guide block 4 is pushed radially inward under the action of the spring 20, so that all the expansion petals 5 are reset, and the bulged parts can be taken out.

[0076] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for forming a cylindrical body with a boss, characterized in that: The following steps are involved: S1, laser blanking: using a sheet material for two-dimensional laser blanking to obtain a fan-shaped rough material (100); S2, rolling and welding: rolling the sector-shaped raw material (100) and then welding it to obtain a cone (200); S3, vacuum heat treatment: performing vacuum heat treatment on the cone (200) to remove welding stress; S4, forming: using a bulging die to bulge to obtain a bulged part; S5, laser cutting: laser cutting is used to process the bulging part to obtain a cone inner cylinder part (300); S6, fluorescence detection: performing fluorescence detection on the cone inner cylinder part (300) obtained in step S5.

2. A method for forming a cylindrical body with bosses as claimed in claim 1, characterized in that: In step S1, the thickness of the sheet material used is 1.2 mm.

3. A method for forming a cylindrical body with a boss according to claim 1, characterized in that: In step S5, the laser cutting processing includes: laser cutting the small end face to ensure the height H of the cone inner cylinder part (300), and laser cutting the φD3 through hole at the large end part of the part, and the 32-φA through hole on the small end side wall.

4. A method for forming a cylindrical body with bosses as claimed in claim 1, characterized in that: The outer diameter of the small end of the conical inner cylinder part (300) is φD2, and the outer diameter of the large end boss is φD1; the outer diameter of the large end of the conical cylinder (200) obtained in step S2 is φB, and the outer diameter of the small end is φA, and the bulging amounts of the large end and the small end of the conical cylinder (200) meet the following requirements: φD1-φB=30mm; φD2-φA=20mm.

5. The method for forming a cylindrical body with bosses according to claim 1, characterized in that: A cone (200) is formed by rolling and welding two pieces of fan-shaped raw materials (100).

6. A method for forming a cylindrical body with bosses as claimed in claim 1, characterized in that: In step S4, the bulging die used comprises a lower die plate (1) and an upper die plate (7); a guide plate (2) is arranged on the top surface of the lower die plate (1), a first annular die (3) is arranged on the top surface of the guide plate (2), and a flaring section is arranged at the mouth of the inner hole of the first die plate (3); a plurality of expansion petals (5) are slidably mounted on the guide plate (2), and an arc-shaped protrusion (5a) is arranged on the upper part of the outer cylindrical surface of the expansion petal (5); a second annular die (6) and a cone (8) are arranged on the bottom surface of the upper die plate (7); When the molds are closed, the lower end surface of the second die (6) abuts against the top surface of the first die (3); the inclined surface of the cone (8) cooperates with the inclined surface of the expansion flap (5), and the expansion flap (5) moves radially outward, so that the arc-shaped protrusion (5a) of the expansion flap (5) penetrates into the annular groove formed by the lower end surface of the second die (6) and the flared section of the first die (3).

7. A method for forming a cylindrical body with bosses as claimed in claim 6, characterized in that: A guide column (12) is arranged on the lower template (1), and a guide sleeve (14) is arranged on the upper template (7). The upper part of the guide column (12) is slidably inserted into the inner hole of the guide sleeve (14).

8. A method for forming a cylindrical body with bosses as claimed in claim 6, characterized in that: A plurality of rectangular sliding holes (2a) are evenly distributed in an annular pattern on the guide plate (2), and a guide block (4) is slidably installed in each rectangular sliding hole (2a); a guide block (4) is installed at the bottom of each expansion flap (5) by means of screws; and the guide block (4) is slidably installed in the rectangular sliding hole (2a).

9. A method for forming a cylindrical body with bosses as claimed in claim 8, characterized in that: A through hole (2b) is provided on the side of the guide plate (2), each rectangular sliding hole (2a) is provided with a corresponding through hole (2a), and the through hole (2a) is connected to the rectangular sliding hole (2a); an internal thread is provided on the through hole (2a); a blind hole (4a) is provided on the guide block (4); a spring (20) is provided in the through hole (2a) of the guide plate (2), and the inner end of the spring (20) is inserted into the blind hole (4a) of the guide block (4); a screw plug (10) is screwed on the through hole (2a) for tightening the spring (20), and the spring (20) is always in a compressed energy storage state.

10. A method for forming a cylindrical body with bosses as claimed in claim 9, characterized in that: In step S4, the bulging process using a bulging die includes the following steps: S401, installing the bulging die on a hydraulic press, fixing the upper die plate (7) on a pressing plate of the hydraulic press, and fixing the lower die plate (1) on a working table of the hydraulic press; S402, the hydraulic press drives the upper mold plate (7) upward, so that the cone (8) is separated from the expansion flaps (5), and the guide block (4) is pushed radially inward under the action of the spring (20), so that all the expansion flaps (5) are reset; S403, sleeve the de-stressed cone (200) on all the expansion petals (5), with the small end of the cone (200) facing downwards; S404, using a hydraulic press to drive the upper mold plate (7) downward, the inclined surface of the cone (8) cooperates with the inclined surface of the expansion flap (5), and the expansion flap (5) moves radially outward, and the inner surface of the first concave mold (3), the bottom surface of the second concave mold (6), the outer surface and the top surface of the expansion flap (5) are used to expand the cone (200); S405, after the pressure is maintained, the upper mold plate (7) is driven upward by a hydraulic press, the cone (8) is separated from the expansion petals (5), and the guide block (4) is pushed radially inward under the action of the spring (20), so that all the expansion petals (5) are reset, and the expanded part can be taken out.

Images