Forming die and method for annular sheet metal part with groove

Abstract

The invention relates to the technical field of sheet metal forming, in particular to a forming die and method for an annular sheet metal part with a groove. The forming die comprises a lower die plate and an upper die plate. A cone is installed on the lower die plate, a plurality of guide strips are evenly distributed on the cone, and expansion blocks are installed on the guide strips in a sliding mode. A top plate is placed on the top face of the lower die plate, and the bottom face of the expansion block abuts against the top face of the top plate. An ejector rod hole is formed in the lower template; a T-shaped sliding block is installed in the T-shaped groove of the top plate in a sliding mode. A concave die block is mounted on the T-shaped sliding block; a reset spring is arranged between the top plate and the T-shaped sliding block, and the reset spring exerts radial outward pulling force on the T-shaped sliding block. A wedge-shaped ring is mounted on the lower surface of the upper template; an annular body is arranged at the central position of the lower surface of the upper template; a groove is formed in the outer conical surface of the expansion block; a protrusion is arranged on the inner conical face of the female die block. After the part is formed, the wedge-shaped ring is separated from the female die block, and the female die block moves outwards to be separated from the formed part under the action of the reset spring.

Description

Technical Field

[0001] The invention relates to the technical field of sheet metal forming, and in particular to a forming die and a forming method for an annular sheet metal part with a groove. Background Art

[0002] Combination Figure 1 The figure shows the structure of a reinforcing rib part on an aircraft engine. The reinforcing rib part has a conical cylindrical structure and a circle of annular grooves are formed radially inward in the middle.

[0003] At present, the process route for the above-mentioned rib parts is single-stage forming, tire marking, then welding into a whole cone, and finally correction forming. In order to form this part, a total of three sets of tooling were invested, namely Figure 2 The single-stage forming mold shown, Figure 3 The line-line tire shown, Figure 4 The molding correction mold shown.

[0004] There are certain problems when using the molding correction mold. Before the molding correction process, the part is composed of three sections of formed sheets (such as Figure 5 The upper die is welded into a cone with three welds. When working, the part needs to be loaded into the die and then put into the top plate. The upper die moves downward to press the expansion block to make it move radially. Under the joint action of the die and the expansion block, the part is corrected and formed into the required shape. After the work is completed, the upper die is lifted, and the expansion block is lifted up by the top plate and slowly moves upward along the cone until the part is completely separated from the expansion block, but the part is always embedded in the die. The die is designed to be two-lobed. At this time, the die and the part need to be lifted out of the mold at the same time to take out the part. The die is separated from the left and right before the part can be taken out. It is calculated that a single die weighs 16kg. It takes two workers to operate at the same time to take out the part each time, which increases the labor intensity. This manual loading and unloading of parts is inconvenient, prolongs working time and work efficiency, and is extremely unsafe. Before the part is corrected, it is welded from three formed parts. The profile at the joint may have misaligned teeth, and the profile cannot be completely consistent, which will also affect the molding quality of the corrected part. Summary of the invention

[0005] The main purpose of the present invention is to provide a forming die and method for an annular sheet metal part with a groove, aiming to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, on the one hand, the present invention proposes a forming mold for an annular sheet metal part with a groove, comprising a lower template and an upper template; a cone is installed on the lower template, a plurality of guide strips are evenly distributed on the cone, and a swelling block is slidably installed on each guide strip; a top plate is placed on the top surface of the lower template, and the bottom surface of the swelling block abuts against the top surface of the top plate; a push rod hole is provided on the lower template; a T-shaped slider is slidably installed in the T-slot of the top plate; a concave module is installed on the T-shaped slider; a return spring is provided between the top plate and the T-shaped slider, and the return spring forms a radial outward pulling force on the T-shaped slider; a wedge ring is installed on the lower surface of the upper template; an annular body is provided at the center position of the lower surface of the upper template; a groove is provided on the outer conical surface of the swelling block; a protrusion is provided on the inner conical surface of the concave module; when the mold is closed, the lower end surface of the annular body abuts against the top surface of the swelling block to push the swelling block downward; the inner conical surface of the wedge ring cooperates with the outer peripheral surface of the concave module and pushes the concave module to move radially inward.

[0007] Preferably, an adjustment plate is provided between the lower template and the top plate.

[0008] Preferably, a slide groove with a taper of 15° is provided on the expansion block, and the cross section of the slide groove is T-shaped; the cross section of the guide bar is T-shaped; the guide bar is slidably matched with the slide groove.

[0009] Preferably, the upper half of the cone is a hexagonal pyramid, and the lower half is a stepped cylinder; a through groove is provided on the pyramidal surface of the hexagonal pyramid, and the guide bar is fixed in the through groove by screws; an inclined sliding surface is provided on the expansion block, and the sliding surface is slidably matched with the pyramidal surface of the hexagonal pyramid.

[0010] Preferably, the cone is inserted into the central through hole of the lower template through a stepped cylinder, and the step surface of the stepped cylinder abuts against the top surface of the lower template; the cone is connected to the lower template by screws.

[0011] Preferably, the top plate is in the shape of an annular disc, and the number of T-slots is six, which are evenly distributed in an annular shape on the top surface of the top plate, and each T-slot is distributed along the radial direction of the top plate.

[0012] Preferably, a slot is provided on the bottom surface of the concave module, the top of the T-shaped slider is inserted into the slot of the concave module, and the T-shaped slider is connected to the concave module by screws; the lower end surface of the concave module is slidably matched with the top surface of the top plate.

[0013] Preferably, a first bolt is installed on the top plate, and a second bolt is installed on the T-shaped slider; hanging holes are respectively provided on the first bolt and the second bolt; one end of the return spring is hung on the hanging hole of the first bolt, and the other end is hung on the hanging hole of the second bolt.

[0014] On the other hand, the present invention also provides a method for forming a ring-shaped sheet metal part with a groove, using the above-mentioned forming mold, comprising the following steps:

[0015] S1. Prepare the wool material: the wool material is an annular cone structure;

[0016] S2. Install the forming mold on the hydraulic press, and the hydraulic press drives the upper template upward. The push rod of the hydraulic press passes through the push rod hole of the lower template and pushes up the top plate, driving the expansion block to slide upward along the guide strip and move radially inward at the same time;

[0017] S3, putting the raw material on all the expansion blocks, and placing a pressing block on the top of the expansion block;

[0018] S4, the upper template is driven downward by the hydraulic press, and the push rod of the hydraulic press is synchronously lowered to make the top plate move downward; the annular body of the upper template abuts against the pressure block and presses down the expansion block until the expansion block moves downward and moves radially outward to hold the raw material tightly; at this time, the wedge ring does not act on the concave module, and the position of the concave module remains unchanged;

[0019] S5. Use the hydraulic press to drive the upper template upward and remove the pressing block;

[0020] S6. The upper mold plate is driven downward by a hydraulic press, and the push rod of the hydraulic press is synchronously lowered to make the top plate move downward. The annular body of the upper mold plate pushes the expansion block downward and moves radially outward, and the wedge ring pushes the concave mold block to move radially inward; until the expansion block, the rough material and the concave mold block are completely fitted, and the annular groove on the part is pressed out;

[0021] S7. After pressure maintenance, the upper mold plate is driven upward by the hydraulic press, and the wedge ring is separated from the concave mold block. The concave mold block moves outward and separates from the molded part under the action of the return spring; the top plate is lifted up by the push rod of the hydraulic press, and the expansion block is driven to slide upward along the guide strip and move radially inward at the same time, and the molded part is separated from the expansion block, and the molded part can be taken out.

[0022] Preferably, in step S2, after the forming mold is installed on the hydraulic press, it is necessary to adjust the axial position height of the top plate so that the top surface of the top plate contacts the lower end surface of the expansion block. The adjustment method is: select an adjustment plate of suitable thickness and place the adjustment plate between the lower mold plate and the top plate.

[0023] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0024] (1) The annular conical cylinder structure of the raw material is integrally pressed into the annular groove on the reinforcing rib part in the forming mold provided by the present invention, which effectively overcomes the problem of misalignment of the profile at the joint caused by the three-stage welding method in the prior art. The integral forming method of the annular conical cylinder raw material is adopted, and the profile of the formed part is stable, the size and position accuracy are high, and the forming efficiency is improved.

[0025] (2) By using the molding die provided by the present invention, after the part is formed, the upper mold plate is driven upward by a hydraulic press, the wedge ring is separated from the concave mold block, and the concave mold block moves outward and separates from the molded part under the action of the return spring; the top plate is lifted up by the push rod of the hydraulic press, driving the expansion block to slide upward along the guide strip while moving radially inward, the molded part is separated from the expansion block, and the molded part can be taken out. Compared with the molding correction mold used in the prior art, the molded part is easy to take out.

[0026] (3) By adopting the molding die and method provided by the present invention, with the help of a hydraulic press and a molding die, a method for integrally forming an annular sheet metal part with a groove is realized by bulging and extrusion. This method simplifies the process, solves the cumbersome multi-process molding of the part and the resulting poor molding state and inconvenient operation of the part. Only one set of tooling is needed to mold a qualified part with a stable molding surface at one time, which greatly shortens the part processing cycle and is simple for workers to operate, making material removal safe and convenient.

[0027] (4) The molding die provided by the present invention has a simple structure and reliable operation. The parts molded in batches have stable profiles, and the size and position accuracy meet the design requirements, thereby improving the product quality of the molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the structure of the reinforcement parts on the aircraft engine;

[0030] Figure 2 It is a schematic diagram of the structure of a single-stage forming die used in the existing process;

[0031] Figure 3 It is a schematic diagram of the structure of a line-marked tire used in the existing process;

[0032] Figure 4 It is a schematic diagram of the structure of the forming correction mold used in the existing process;

[0033] Figure 5 This is a schematic diagram of the structure of one-third of the reinforcement rib parts;

[0034] Figure 6 A schematic diagram of the structure of the molding die provided by the present invention;

[0035] Figure 7 It is a partial top view of six expansion blocks in the molding die provided by the present invention when they are evenly distributed in an annular shape;

[0036] Figure 8 for Figure 7 Middle AA section view;

[0037] Fig. 9 It is a partial top view of six concave modules in the molding die provided by the present invention when they are evenly distributed in an annular shape;

[0038] Fig.10 for Fig. 9 Middle BB section view;

[0039] Fig.11 A partial top view of a top plate in a molding die provided by the present invention;

[0040] Fig.12 for Fig.11 Middle A-direction view;

[0041] Fig.13 A cross-sectional view of a wedge-shaped ring in a molding die provided by the present invention;

[0042] Fig.14 A top view of a cone in a forming mold provided by the present invention;

[0043] Fig.15 for Fig.14 CC section view along the middle edge;

[0044] Fig.16 It is a structural schematic diagram of the wool material in the present invention.

[0045] Explanation of the accompanying numbers: 1. Lower template; 1a. Push rod hole; 2. Adjustment plate; 3. Push plate; 3a. T-slot; 4. T-slider; 5. Concave module; 5a. Protrusion; 5b. Slot; 6. Expansion block; 6a. Groove; 6b. Slide; 6c. Sliding surface; 7. Cone; 7a. Hexagonal pyramid; 7b. Step cylinder; 7c. Through groove; 8. Guide strip; 9. Wedge ring; 10. Upper template; 10a. Ring body; 11. Press block; 12. Return spring; 13. First bolt; 14. Second bolt; 15. Raw material. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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.

[0049] Combination Figures 6 to 15 As shown in the figure, a specific embodiment of a forming mold for a grooved annular sheet metal part provided by the present invention is provided, wherein the forming mold comprises a lower mold plate 1 and an upper mold plate 10; a cone 7 is installed on the lower mold plate 1, a plurality of guide strips 8 are evenly distributed on the cone 7, and a swelling block 6 is slidably installed on each guide strip 8; a top plate 3 is placed on the top surface of the lower mold plate 1, and the bottom surface of the swelling block 6 abuts against the top surface of the top plate 3; a push rod hole 1a is provided on the lower mold plate 1; a T-shaped slider 4 is slidably installed in the T-shaped slot 3a of the top plate 3; A concave module 5 is installed on the slider 4; a return spring 12 is arranged between the top plate 3 and the T-shaped slider 4, and the return spring 12 forms a radially outward pulling force on the T-shaped slider 4; a wedge ring 9 is installed on the lower surface of the upper template 10; an annular body 10a is integrally formed at the center position of the lower surface of the upper template 10; when the mold is closed, the lower end surface of the annular body 10a abuts against the top surface of the expansion block 6, pushing the expansion block 6 downward; the inner conical surface of the wedge ring 9 cooperates with the outer peripheral surface of the concave module 5, and pushes the concave module 5 to move radially inward.

[0050] Combination Figures 6 to 8 As shown, the expansion block 6 is a movable part. There are six expansion blocks 6, which are evenly distributed in a ring and installed on the cone 7 through six guide strips 8. A slide groove 6b with a taper of 15° is provided on the expansion block 6, that is, the angle between the slide groove 6b and the bottom surface of the expansion block 6 is 15°, and the cross section of the slide groove 6b is T-shaped; the cross section of the guide strip 8 is T-shaped; the guide strip 8 is slidably matched with the slide groove 6b.

[0051] Combination Fig. 9 , Fig.10As shown, the concave module 5 is also a movable part. There are six concave modules 5, which are evenly distributed in a ring and installed on the top surface of the top plate 3 through T-shaped sliders 4. A slot 5b is provided on the bottom surface of the concave module 5. The top of the T-shaped slider 4 is inserted into the slot 5b of the concave module 5, and the T-shaped slider 4 is connected to the concave module 5 by screws; the lower end surface of the concave module 5 is slidably matched with the top surface of the top plate 3.

[0052] Combination Figure 6 , Figure 8 and Fig.10 As shown, the outer cylindrical surface of the expansion block 6 and the inner conical surface of the concave module 5 are respectively formed surfaces for pressing the rough material 15. A groove 6a is arranged on the outer conical surface of the expansion block 6; a protrusion 5a is arranged on the inner conical surface of the concave module 5; when the rough material 15 is pressed, the annular groove on the part can be pressed out after the expansion block 5, the rough material 15 and the concave module 5 are fully fitted.

[0053] In this embodiment, the wedge ring 9 is a torus structure, connected to the upper mold plate 10 by screws and pins. The inner profile of the wedge ring 9 is a 15° conical surface, and the outer conical surface of the concave module 5 is a 15° conical surface. When the mold is closed, the inner conical surface of the wedge ring 9 cooperates with the outer peripheral surface of the concave module 5, that is, the concave module 5 can be pushed to move radially inward on the top surface of the top plate 3. When the mold is opened, the wedge ring 9 and the concave module 5 are separated from each other, and the concave module 5 is retreated under the action of the reset spring 12.

[0054] In this embodiment, an adjustment plate 2 is provided between the lower mold plate 1 and the top plate 3. By selecting an adjustment plate 2 of suitable thickness and placing the adjustment plate 2 between the lower mold plate 1 and the top plate 3, the axial position height of the top plate 3 is adjusted so that the top surface of the top plate 3 contacts the lower end surface of the expansion block 6.

[0055] Combination Fig.14 , Fig.15 As shown, the upper half of the cone 7 is a hexagonal pyramid 7a, and the lower half is a stepped cylinder 7b; the inclination angle of the pyramidal surface of the hexagonal pyramid 7a is 15°, a through groove 7c is provided on the pyramidal surface of the hexagonal pyramid 7a, and the guide strip 8 is fixed in the through groove 7c by screws; the expansion block 6 is provided with an inclined sliding surface 6c, and the sliding surface 6c is slidably matched with the pyramidal surface of the hexagonal pyramid 7a.

[0056] Combination Figure 6 , Fig.15 As shown, the cone 7 is inserted into the central through hole of the lower template 1 through the stepped cylinder 7b, and the step surface of the stepped cylinder 7b abuts against the top surface of the lower template 1; the cone 7 and the lower template 1 are connected by screws and pins.

[0057] Combination Fig.12 , Fig.13The top plate 3 is in the shape of an annular disc, and the number of T-slots 3a is six, which are evenly distributed on the top surface of the top plate 3, and each T-slot 3a is distributed along the radial direction of the top plate 3. In this embodiment, the top plate 3 mainly serves as a sliding mounting base for the concave module 5, and when the top rod of the hydraulic press passes through the top rod hole 1a of the lower mold plate 1 and lifts the top plate 3, the top plate 3 can lift the expansion block 6.

[0058] Combination Figure 6 As shown, a first bolt 13 is installed on the top plate 3, and a second bolt 14 is installed on the T-shaped slider 4; hanging holes are respectively provided on the first bolt 13 and the second bolt 14; one end of the return spring 12 is hung on the hanging hole of the first bolt 13, and the other end is hung on the hanging hole of the second bolt 14.

[0059] Combination Figure 6 , Fig.16 As shown, this embodiment also provides a method for forming a ring-shaped sheet metal part with a groove, using the above-mentioned forming mold, comprising the following steps:

[0060] S1. Prepare the raw material 15: The raw material 15 is an annular cone structure.

[0061] S2. Install the forming mold on a hydraulic press, which drives the upper template 10 upward. The push rod of the hydraulic press passes through the push rod hole 1a of the lower template 1 and lifts the top plate 3, driving the expansion block 6 to slide upward along the guide strip 8 while moving radially inward.

[0062] S3, the raw material 15 is put on all the expansion blocks 6, and the pressing block 11 is placed on the top of the expansion block 6.

[0063] S4, the upper template 10 is driven downward by the hydraulic press, and the push rod of the hydraulic press is synchronously lowered to make the top plate 3 move downward; the annular body 10a of the upper template 10 abuts against the pressing block 11 and presses down the expansion block 6, until the expansion block 6 moves downward and moves radially outward to hold the rough material 15 tightly; at this time, the wedge ring 9 does not act on the concave module 5, and the position of the concave module 5 remains unchanged. The rough material 15 is completely attached to the expansion block 6, so that the rough material 15 has a support surface and moves evenly when subjected to force, avoiding deviation and mutation.

[0064] S5. Use a hydraulic press to drive the upper template 10 upward and remove the pressing block 11.

[0065] S6. The upper mold plate 10 is driven downward by a hydraulic press. The push rod of the hydraulic press is simultaneously lowered to make the top plate 3 move downward. The annular body 10a of the upper mold plate 10 pushes the expansion block 6 downward and moves radially outward. The wedge ring 9 pushes the concave mold block 5 to move radially inward; until the expansion block 5, the rough material 15 and the concave mold block 5 are completely fitted together to press out the annular groove on the part.

[0066] S7. After pressure maintenance, the upper mold plate 10 is driven upward by the hydraulic press, and the wedge ring 9 is separated from the concave mold block 5. The concave mold block 5 moves outward and separates from the molded part under the action of the return spring 12; the top plate 3 is lifted up by the push rod of the hydraulic press, and the expansion block 6 is driven to slide upward along the guide strip 8 and move radially inward at the same time, and the molded part is separated from the expansion block 6, and the molded part can be taken out.

[0067] In step S2, after the forming mold is installed on the hydraulic press, it is necessary to adjust the axial position height of the top plate 3 so that the top surface of the top plate 3 contacts the lower end surface of the expansion block 6. The adjustment method is: select an adjustment plate 2 of suitable thickness and place the adjustment plate 2 between the lower mold plate 1 and the top plate 3.

[0068] 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 forming die for a ring-shaped sheet metal part with a groove, characterized in that: It comprises a lower template (1) and an upper template (10); a cone (7) is installed on the lower template (1), a plurality of guide strips (8) are evenly distributed on the cone (7), and a swelling block (6) is slidably installed on each guide strip (8); A top plate (3) is placed on the top surface of the lower template (1), and the bottom surface of the expansion block (6) is against the top surface of the top plate (3); a top rod hole (1a) is provided on the lower template (1); a T-shaped slider (4) is slidably installed in the T-shaped groove (3a) of the top plate (3); a concave module (5) is installed on the T-shaped slider (4); a return spring (12) is provided between the top plate (3) and the T-shaped slider (4), and the return spring (12) forms a radial outward pulling force on the T-shaped slider (4); A wedge ring (9) is installed on the lower surface of the upper mold plate (10); a ring body (10a) is arranged at the center of the lower surface of the upper mold plate (10); a groove (6a) is arranged on the outer conical surface of the expansion block (6); and a protrusion (5a) is arranged on the inner conical surface of the concave module (5); When the mold is closed, the lower end surface of the annular body (10a) abuts against the top surface of the expansion block (6), pushing the expansion block (6) downward; the inner conical surface of the wedge ring (9) matches the outer peripheral surface of the concave module (5), and pushes the concave module (5) to move radially inward.

2. A forming die for an annular sheet metal part with a groove as claimed in claim 1, characterized in that: An adjustment plate (2) is provided between the lower template (1) and the top plate (3).

3. A forming die for an annular sheet metal part with a groove as claimed in claim 1, characterized in that: The expansion block (6) is provided with a slide groove (6b) with a taper of 15°, and the cross section of the slide groove (6b) is in a T-shape; the cross section of the guide bar (8) is in a T-shape; the guide bar (8) is slidably matched with the slide groove (6b).

4. A forming die for an annular sheet metal part with grooves as claimed in claim 1, characterized in that: The upper half of the cone (7) is a hexagonal pyramid (7a), and the lower half is a stepped cylinder (7b); a through groove (7c) is provided on the pyramidal surface of the hexagonal pyramid (7a), and the guide strip (8) is fixed in the through groove (7c) by means of screws; an inclined sliding surface (6c) is provided on the expansion block (6), and the sliding surface (6c) is in sliding cooperation with the pyramidal surface of the hexagonal pyramid (7a).

5. A forming die for an annular sheet metal part with a groove as claimed in claim 4, characterized in that: The cone (7) is inserted into the central through hole of the lower template (1) via a stepped cylinder (7b), and the step surface of the stepped cylinder (7b) abuts against the top surface of the lower template (1); the cone (7) and the lower template (1) are connected by screws.

6. A forming die for an annular sheet metal part with grooves as claimed in claim 1, characterized in that: The top plate (3) is in the shape of an annular disc, and has six T-shaped slots (3a) evenly distributed in an annular pattern on the top surface of the top plate (3), and each T-shaped slot (3a) is distributed along the radial direction of the top plate (3).

7. A forming die for an annular sheet metal part with grooves as claimed in claim 1, characterized in that: A slot (5b) is provided on the bottom surface of the concave module (5), the top of the T-shaped slider (4) is inserted into the slot (5b) of the concave module (5), and the T-shaped slider (4) and the concave module (5) are connected by screws; the lower end surface of the concave module (5) is slidably matched with the top surface of the top plate (3).

8. A forming die for an annular sheet metal part with grooves as claimed in claim 1, characterized in that: A first bolt (13) is installed on the top plate (3), and a second bolt (14) is installed on the T-shaped slider (4); hanging holes are respectively provided on the first bolt (13) and the second bolt (14); one end of the return spring (12) is hung on the hanging hole of the first bolt (13), and the other end is hung on the hanging hole of the second bolt (14).

9. A method for forming a ring-shaped sheet metal part with a groove, characterized in that: The molding die according to any one of claims 1 to 8 is used, comprising the following steps: S1, preparing a raw material (15): the raw material (15) is an annular cone structure; S2. The forming mold is mounted on a hydraulic press, and the hydraulic press drives the upper mold plate (10) upward. The push rod of the hydraulic press passes through the push rod hole (1a) of the lower mold plate (1) and then lifts the top plate (3), driving the expansion block (6) to slide upward along the guide strip (8) and move radially inward at the same time; S3, putting the raw material (15) on all the expansion blocks (6), and placing the pressing block (11) on the top of the expansion block (6); S4, the upper template (10) is driven downward by a hydraulic press, and the top rod of the hydraulic press is synchronously lowered to cause the top plate (3) to move downward; the annular body (10a) of the upper template (10) abuts against the pressing block (11) and presses down the expansion block (6) until the expansion block (6) moves downward and moves radially outward to hold the raw material (15); at this time, the wedge ring (9) does not act on the concave module (5), and the position of the concave module (5) remains unchanged; S5, using a hydraulic press to drive the upper template (10) upward and remove the pressing block (11); S6, using a hydraulic press to drive the upper mold plate (10) downward, the push rod of the hydraulic press is synchronously lowered to cause the top plate (3) to move downward, the annular body (10a) of the upper mold plate (10) pushes the expansion block (6) downward and moves radially outward, and the wedge ring (9) pushes the concave mold block (5) to move radially inward; until the expansion block (5), the rough material (15) and the concave mold block (5) are completely fitted together, and an annular groove on the part is pressed out; S7. After the pressure is maintained, the upper mold plate (10) is driven upward by the hydraulic press, the wedge ring (9) is separated from the concave mold block (5), and the concave mold block (5) moves outward under the action of the return spring (12) to separate from the molded part; the top plate (3) is lifted up by the push rod of the hydraulic press, driving the expansion block (6) to slide upward along the guide strip (8) and move radially inward at the same time, so that the molded part is separated from the expansion block (6), and the molded part can be taken out.

10. A method for forming a grooved annular sheet metal part according to claim 9, characterized in that: In step S2, after the forming mold is installed on the hydraulic press, it is necessary to adjust the axial position height of the top plate (3) so that the top surface of the top plate (3) contacts the lower end surface of the expansion block (6). The adjustment method is: select an adjustment plate (2) of suitable thickness and place the adjustment plate (2) between the lower mold plate (1) and the top plate (3).

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