A forming method for a cylinder with a boss

Abstract

This invention relates to the field of aero-engine manufacturing technology, and particularly to a method for forming a cylindrical body with a boss, comprising the following steps: S1, laser blanking: using sheet metal for two-dimensional laser blanking to obtain a fan-shaped blank; S2, rolling and welding: rolling the fan-shaped blank and then welding it to obtain a cone-shaped cylinder; S3, vacuum heat treatment: subjecting the cone-shaped cylinder to vacuum heat treatment to remove welding stress; S4, forming: using a bulging mold to bulge the cone-shaped part; S5, laser cutting: processing the bulging part with laser cutting to obtain a cone-shaped inner cylinder part; S6, fluorescence detection: performing fluorescence detection on the cone-shaped inner cylinder part obtained in step S5. Using a cone-shaped inner cylinder for integral bulging to obtain the cone-shaped inner cylinder part effectively overcomes the problems of wrinkles, poor surface quality, and difficulty in controlling welding deformation that exist in traditional processes using segmented pressing and welding. It shortens the processing cycle of the cone-shaped inner cylinder part while ensuring the forming quality of the cone-shaped inner cylinder part.

Description

Technical Field

[0001] This invention relates to the field of aero-engine manufacturing technology, and in particular to a method for forming a cylindrical body with a boss. Background Technology

[0002] The conical inner cylindrical part 300 is an internal cylindrical part of the inner cone of an aero-engine. The final height of the part is H, the outer diameter of the small end is φD2, and the outer diameter of the large end boss is φD1. The large end boss has an inwardly folded opening with a through hole of diameter φD3. A 32-φA through hole is machined on the side wall of the small end of the part. The angle between the transition conical surfaces of the small end and the large end boss is α. Its overall structure is a rotating body structure, a typical thin-walled cylindrical part with a boss. The cross-sectional structure of this conical inner cylindrical part is shown below. Figure 1 As shown, the three-dimensional structure is as follows Figure 2 As shown.

[0003] Currently, the conical inner cylinder is processed using a 1 / 3 segmented pressing-cutting-welding-correction-laser cutting process. During segmented pressing, wrinkles easily form, resulting in poor surface quality. Before welding, wrinkled areas need to be repaired by hammering, and welding is performed along with the molded surface, making welding difficult and challenging to control deformation. After welding, tooling is used to correct the deformation, leading to low processing efficiency. To improve processing efficiency and ensure the quality of the formed surface, a forming method for a cylinder with a boss is proposed. Summary of the Invention

[0004] The main objective of this invention is to provide a method for forming a cylindrical body with a boss, thereby solving the aforementioned technical problems.

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

[0006] S1. Laser blanking: The sheet metal is cut into two dimensions using laser to obtain fan-shaped blanks;

[0007] S2. Rolling and welding: The fan-shaped raw material is rolled into a circle and then welded to obtain a cone-shaped cylinder;

[0008] S3. Vacuum heat treatment: The cone is subjected to vacuum heat treatment to remove welding stress;

[0009] S4. Forming: The bulging mold is used to bulge the part to obtain the bulging part;

[0010] S5. Laser cutting: Laser cutting is used to process bulging parts to obtain conical inner cylinder parts;

[0011] S6. Fluorescence detection: Perform fluorescence detection on the cone-shaped inner cylinder part obtained in step S5.

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

[0013] Preferably, in step S5, the laser-cut processing includes: laser-cutting the small end face to ensure the height H of the inner cylindrical part, and laser-cutting the φD3 through hole at the large end of the part, and the 32-φA through hole on the small end sidewall.

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

[0015] Preferably, a cone is made by rolling two fan-shaped pieces of raw material into a circle and then welding them together.

[0016] Preferably, in step S4, the bulging mold includes a lower mold plate and an upper mold plate; a guide plate is provided on the top surface of the lower mold plate, and a first annular cavity mold is provided on the top surface of the guide plate, with a flared section at the opening of the inner hole of the first cavity mold; multiple bulging petals are slidably mounted on the guide plate, and an arc-shaped protrusion is provided on the upper part of the outer cylindrical surface of the bulging petal; a second annular cavity mold and a cone are provided on the bottom surface of the upper mold plate; when the mold is closed, the lower end face of the second cavity mold abuts against the top surface of the first cavity mold; the inclined surface of the cone cooperates with the inclined surface of the bulging petal, and the bulging petal moves radially outward, so that the arc-shaped protrusion of the bulging petal penetrates into the lower end face of the second cavity mold and forms an annular groove together with the flared section of the first cavity mold.

[0017] Preferably, a guide post is provided on the lower template and a guide sleeve is provided on the upper template, with the upper part of the guide post slidably inserted into the inner hole of the guide sleeve.

[0018] Preferably, the guide plate has a plurality of rectangular sliding holes evenly distributed in a ring, and a guide block is slidably installed in each rectangular sliding hole; a guide block is installed at the bottom of each expansion flap by a screw; the guide block is slidably installed in the rectangular sliding hole.

[0019] Preferably, a through hole is provided on the side of the guide plate, and each rectangular sliding hole is provided with a corresponding through hole, and the through hole is connected to the rectangular sliding hole; the through hole is provided with an internal thread; 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 into the blind hole of the guide block; a screw plug is screwed on the through hole to tighten the spring, and the spring is always in a compressed and energy-storing state.

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

[0021] S401. Install the forming mold on the hydraulic press, fix the upper template on the pressure plate of the hydraulic press, and fix the lower template on the worktable of the hydraulic press.

[0022] S402. The hydraulic press drives the upper template to move upward, causing the cone to separate from the expansion petals. Under the action of the spring, the guide block is pushed to move radially inward, so that all expansion petals are reset.

[0023] S403. The stress-relieved cone is fitted onto all the expansion valves, with the small end of the cone facing down;

[0024] S404. The upper template is driven downward by a hydraulic press. The inclined surface of the cone matches the inclined surface of the expansion petal, and the expansion petal moves radially outward. The inner surface of the first die, the bottom surface of the second die, the outer surface and the top surface of the expansion petal are used together to expand the cone.

[0025] S405. After pressure holding, the upper template is moved upward by the hydraulic press, the cone separates from the expansion petals, and the guide block is pushed radially inward by the spring, so that all expansion petals are reset, and the bulging part 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 this invention, a conical inner cylinder part is obtained by integral expansion forming of a conical cylinder, which effectively overcomes the problems of wrinkles, poor surface quality, and difficulty in controlling welding deformation that exist in traditional processes that use segmented pressing and welding. The processing cycle of the conical inner cylinder part is shortened, while ensuring the forming quality of the conical inner cylinder part. The processing method provided by this invention is more reliable, and the processed parts have better consistency and higher quality.

[0028] (2) In this invention, the bulging mold is equipped with a spring reset structure. After the cone separates from the bulging petals, the guide block is pushed radially inward under the action of the spring, so that all the bulging petals are reset, and the bulging part can be taken out. Therefore, the spring reset structure facilitates the removal of the bulging part. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the conical inner cylinder part in this invention;

[0031] Figure 2This is a three-dimensional structural diagram of the conical inner cylinder part in this invention;

[0032] Figure 3 This is a schematic diagram of the bulging mold in this invention;

[0033] Figure 4 This is a schematic diagram of the structure of the fan-shaped wool in this invention;

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

[0035] Figure 6 This is a schematic diagram of the lower template in a bulging mold;

[0036] Figure 7 This is a schematic diagram of the guide plate in the bulging mold;

[0037] Figure 8 for Figure 7 Sectional view of CC;

[0038] Figure 9 This is a cross-sectional view of the first cavity die in the bulging mold;

[0039] Figure 10 for Figure 9 A schematic diagram of the hole locations in the A-direction view;

[0040] Figure 11 This is a top view of the guide block in the bulging mold;

[0041] Figure 12 for Figure 11 DD section view;

[0042] Figure 13 This is a partial top view of the bulging flaps in the bulging mold;

[0043] Figure 14 for Figure 13 Sectional view of EE;

[0044] Figure 15 This is a top view of the second cavity die in the bulging mold;

[0045] Figure 16 for Figure 15 Sectional view of FF;

[0046] Figure 17 This is a schematic diagram of the upper template in a bulging mold;

[0047] Figure 18 A partial top view of the cone in the bulging mold.

[0048] Figure 19 for Figure 18Sectional view of section II.

[0049] Explanation of reference numerals: 1. Lower die plate; 2. Guide plate; 2a. Rectangular sliding hole; 2b. Through hole; 3. First die cavity; 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 cavity; 7. Upper die plate; 8. Cone; 9. First lifting bolt; 10. Plug; 12. Guide post; 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. Sector-shaped blank; 200. Conical cylinder; 300. Inner cylinder part of the cone. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

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

[0052] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

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

[0054] S1. Laser blanking: A 1.2mm thick sheet is laser-cut in two dimensions to obtain a fan-shaped blank of 100.

[0055] S2. Rolling and welding: Roll the fan-shaped material 100 into a circle and then weld it to obtain the cone 200.

[0056] S3. Vacuum heat treatment: The cone 200 is subjected to vacuum heat treatment to remove welding stress;

[0057] S4. Forming: The bulging mold is used to bulge the part to obtain the bulging part;

[0058] S5. Laser cutting: Laser cutting is used to process bulging parts to obtain a cone-shaped inner cylinder part 300.

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

[0060] Combination Figure 1 As shown, in step S5, the laser cutting process includes: laser cutting the small end face to ensure the height H of the inner conical cylinder part 300, and laser cutting the φD3 through hole at the large end of the part, and the 32-φA through hole on the small end sidewall.

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

[0062] Combination Figure 1 , Figure 5 As shown, 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. The bulging amount of the large and small ends of the conical cylinder 200 meets the following requirements: φD1-φB=30mm; φD2-φA=20mm. By setting a reasonable bulging amount, wrinkles are avoided during bulging.

[0063] In this embodiment, to reduce the difficulty of material preparation, a cone 200 is formed by rolling two fan-shaped pieces of raw material 100 together and then welding them. If only one fan-shaped piece of raw material 100 were rolled together and then welded, the material would be too long, making material preparation difficult.

[0064] Combination Figure 3As shown, in step S4, the bulging mold includes a lower mold plate 1 and an upper mold plate 7. A guide plate 2 is provided on the top surface of the lower mold plate 1, and a first annular die 3 is provided on the top surface of the guide plate 2. A flared section is provided at the opening of the inner hole of the first die 3. Multiple bulging petals 5 are slidably mounted on the guide plate 2, and an arc-shaped protrusion 5a is provided on the upper part of the outer cylindrical surface of the bulging petals 5. A second annular die 6 and a cone 8 are provided on the bottom surface of the upper mold plate 7. Specifically, the second die 6 is fastened to the upper mold plate 7 by screws and a first cylindrical pin 16, and the cone 8 is fastened to the upper mold plate 7 by a cylindrical pin and a first screw 17. The first die 3 is fastened to the guide plate 2 by a third screw 21 and a cylindrical pin. The lower mold plate 1 is fastened to the guide plate 2 by screws and a cylindrical pin.

[0065] When the mold is closed, the lower end face of the second cavity 6 abuts against the top surface of the first cavity 3; the inclined surface of the cone 8 matches 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 lower end face of the second cavity 6 and the flared section of the first cavity 3 to form an annular groove.

[0066] Combination Figure 9 , Figure 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 cylindrical part 300, and the cylindrical section 3b is used to form the outer cylindrical surface of the large end boss φD1. A pin hole 3d and a screw hole 3c are provided on the first die 3.

[0067] To facilitate mold lifting, four first lifting bolts 9 are evenly distributed on the outer periphery of the lower template 1. Four second lifting bolts 15 are also evenly distributed on the outer periphery of the upper template.

[0068] Combination Figure 3 As shown, a guide post 12 is provided on the lower template 1, and a guide sleeve 14 is provided on the upper template 7. The upper part of the guide post 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 a ring 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 a screw; the guide block 4 is slidably installed in the rectangular sliding hole 2a. Specifically, the guide block 4 and the expansion flap 5 are fastened together 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 provided with a corresponding through hole 2a, and the through hole 2a is connected to the rectangular sliding hole 2a; the through hole 2a is provided with an internal thread; 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 into the through hole 2a to tighten the spring 20, and the spring 20 is always in a compressed and energy-storing state.

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

[0071] S401. Install the forming mold on the hydraulic press, fix the upper template 7 on the pressure plate of the hydraulic press, and fix the lower template 1 on the worktable of the hydraulic press.

[0072] S402, the hydraulic press drives the upper template 7 to move upward, causing the cone 8 to separate from the expansion petals 5. Under the action of the spring 20, the guide block 4 is pushed to move radially inward, so that all the expansion petals 5 are reset.

[0073] S403. The stress-relieved cone 200 is fitted onto all the expansion flaps 5, with the small end of the cone 200 facing down;

[0074] S404. Using a hydraulic press, the upper template 7 is driven downward. The inclined surface of the cone 8 matches the inclined surface of the expansion petal 5, and the expansion petal 5 moves radially outward. The inner surface of the first die 3, the bottom surface of the second die 6, and the outer and top surfaces of the expansion petal 5 work together to expand the cone cylinder 200. During forming, the second die 6 moves downward, and the expansion petal 5 moves radially outward. The top surface of the arc-shaped protrusion 5a of the expansion petal 5 works together with the second die 6 to cause the large end boss opening of the part to fold inward. The arc-shaped protrusion 5a of the expansion petal 5 penetrates into the lower end surface of the second die 6 and forms an annular groove together with the flared section of the first die 3, forming the large end boss on the part.

[0075] S405. After holding the pressure, the upper template 7 is moved upward by the hydraulic press, the cone 8 is separated from the expansion petals 5, and the guide block 4 is pushed radially inward by the spring 20, so that all the expansion petals 5 are reset, and the bulging part can be taken out.

[0076] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for forming a cylindrical body with a boss, characterized in that, The following steps are involved: S1. Laser blanking: The sheet metal is laser-cut in two dimensions to obtain a fan-shaped blank (100). S2. Rolling and welding: Roll the fan-shaped material (100) into a circle and then weld it to obtain a cone (200). S3. Vacuum heat treatment: The cone (200) is subjected to vacuum heat treatment to remove welding stress; S4. Forming: The bulging mold is used to bulge the part to obtain the bulging part; S5. Laser cutting: Laser cutting is used to process bulging parts to obtain conical inner cylinder parts (300). S6. Fluorescence detection: Perform fluorescence detection on the cone-shaped inner cylinder part (300) obtained in step S5; In step S4, the bulging mold used includes a lower template (1) and an upper template (7); a guide plate (2) is provided on the top surface of the lower template (1), and a first annular cavity (3) is provided on the top surface of the guide plate (2), with a flared section at the opening of the inner hole of the first cavity (3); multiple bulging petals (5) are slidably installed on the guide plate (2), and an arc-shaped protrusion (5a) is provided on the upper part of the outer cylindrical surface of the bulging petal (5); a second annular cavity (6) and a cone (8) are provided on the bottom surface of the upper template (7). When the mold is closed, the lower end face of the second cavity (6) abuts against the top surface of the first cavity (3); the inclined surface of the cone (8) matches 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 face of the second cavity (6) and the flared section of the first cavity (3); Multiple rectangular sliding holes (2a) are evenly distributed in a ring 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 valve (5) by screws; the guide block (4) is slidably installed in the rectangular sliding hole (2a); A through hole is provided on the side of the guide plate (2), and each rectangular sliding hole (2a) is provided with a corresponding through hole, and the through hole is connected to the rectangular sliding hole (2a); an internal thread is provided on the through hole; a blind hole (4a) is provided on the guide block (4); a spring (20) is provided in the through hole 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 to tighten the spring (20), and the spring (20) is always in a compressed energy storage state.

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

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

4. The method for forming a cylindrical body with a boss as described 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. The bulging amount of the large end and the small end of the conical cylinder (200) meets the following requirements: φD1-φB=30mm; φD2-φA=20mm.

5. The method for forming a cylindrical body with a boss as described in claim 1, characterized in that, A cone (200) is made by rolling two fan-shaped pieces of raw material (100) into a circle and then welding them together.

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

7. The method for forming a cylindrical body with a boss as described in claim 1, characterized in that, In step S4, the bulging process using a bulging mold includes the following steps: S401. Install the bulging mold on the hydraulic press, fix the upper template (7) on the pressure plate of the hydraulic press, and fix the lower template (1) on the worktable of the hydraulic press. S402, the hydraulic press drives the upper template (7) to move upward, so that the cone (8) separates from the expansion petals (5), and under the action of the spring (20), the guide block (4) moves radially inward, so that all the expansion petals (5) are reset; S403. The stress-relieved cone (200) is fitted onto all the expansion valves (5), with the small end of the cone (200) facing down; S404. The upper template (7) is driven down by a hydraulic press. The inclined surface of the cone (8) matches the inclined surface of the expansion petal (5), and the expansion petal (5) moves radially outward. 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 petal (5) are used together to expand the cone (200). S405. After holding the pressure, the upper template (7) is driven upward by the hydraulic press. The cone (8) is separated from the expansion petals (5). Under the action of the spring (20), the guide block (4) is pushed to move radially inward, so that all the expansion petals (5) are reset, and the bulging parts can be taken out.

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