A molding die and method for forming a grooved annular sheet metal part

Abstract

This invention relates to the field of sheet metal forming technology, and more particularly to a forming mold and method for a grooved annular sheet metal part. The forming mold includes a lower mold plate and an upper mold plate; a cone is mounted on the lower mold plate, and multiple guide strips are evenly distributed on the cone, with expansion blocks slidably mounted on the guide strips; a top plate is placed on the top surface of the lower mold plate, and the bottom surface of the expansion blocks abuts against the top surface of the top plate; a push rod hole is provided on the lower mold plate; a T-shaped slider is slidably mounted in a T-slot of the top plate; a recessed module is mounted on the T-shaped slider; a return spring is provided between the top plate and the T-shaped slider, and the return spring exerts a radially outward pulling force on the T-shaped slider; a wedge ring is mounted on the lower surface of the upper mold plate; an annular body is provided at the center of the lower surface of the upper mold plate; a groove is provided on the outer conical surface of the expansion block; and a protrusion is provided on the inner conical surface of the recessed module. After the part is formed, the wedge ring detaches from the recessed module, and the recessed module moves outward and separates from the formed part under the action of the return spring.

Description

Technical Field

[0001] This invention relates to the field of sheet metal forming technology, and in particular to a forming mold and method for a grooved annular sheet metal part. Background Technology

[0002] Combination Figure 1 The diagram shows a structural schematic of a reinforcing rib on an aircraft engine. The reinforcing rib has a conical structure with a radially concave annular groove in the middle.

[0003] Currently, the manufacturing process for the aforementioned reinforcing rib part involves single-segment forming, die marking, welding into a single cone, and finally, correction and shaping. Three sets of tooling are used to form this part, as follows: Figure 2 The single-segment molding die shown Figure 3 The marked tire, Figure 4 The forming and correction mold shown.

[0004] There are some problems when using this molding and straightening mold. Before the molding and straightening process, the part consists of three pre-formed sheet pieces (such as...). Figure 5 (As shown) The parts are welded into a cone shape with three weld seams. During operation, the part is loaded into the die and then placed into the top plate. The upper die moves downward, pressing down on the expansion block to make it move radially. Under the combined action of the die and the expansion block, the part is corrected and shaped into the required shape. After the operation is completed, the upper die is lifted, and the expansion block is lifted by the top plate and slowly moves upward along the cone until the part is completely separated from the expansion block. However, the part remains embedded in the die. The die is designed with two halves. To remove the part, the die and the part must be lifted out of the mold simultaneously, separating the left and right sides of the die, before the part can be removed. A single die weighs 16 kg, and two workers are needed to operate it simultaneously each time a part is removed, increasing the labor intensity. This manual loading and unloading operation is inconvenient, prolongs working time and reduces efficiency, and is extremely unsafe. Before the part is corrected, it is welded from three pre-formed parts. The joint surface may have misalignment, and the surface may not be completely consistent, which will also affect the forming quality of the corrected part. Summary of the Invention

[0005] The main objective of this invention is to provide a molding die and method for forming a grooved annular sheet metal part, in order to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention provides a forming mold for a grooved annular sheet metal part, comprising a lower mold plate and an upper mold plate; a cone is mounted on the lower mold plate, with multiple guide strips evenly distributed on the cone, and an expansion block slidably mounted on each guide strip; a top plate is placed on the top surface of the lower mold plate, and the bottom surface of the expansion block abuts against the top surface of the top plate; a push rod hole is provided on the lower mold plate; a T-shaped slider is slidably mounted in a T-slot of the top plate; a recessed module is mounted on the T-shaped slider; a return spring is provided between the top plate and the T-shaped slider, and the return spring exerts a radially outward pulling force on the T-shaped slider; a wedge ring is mounted on the lower surface of the upper mold plate; an annular body is provided at the center of the lower surface of the upper mold plate; a groove is provided on the outer cone surface of the expansion block; a protrusion is provided on the inner cone surface of the recessed module; when the mold is closed, the lower end face of the annular body abuts against the top surface of the expansion block, pushing the expansion block downward; the inner cone surface of the wedge ring cooperates with the outer peripheral surface of the recessed module, and pushes the recessed module to move radially inward.

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

[0008] Preferably, a groove with a taper of 15° is provided on the expansion block, and the cross-section of the groove is T-shaped; the cross-section of the guide strip is T-shaped; the guide strip and the groove are in sliding fit.

[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 strip is fixed in the through groove by screws; the expansion block is provided with an inclined sliding surface, which slides in cooperation with the pyramidal surface of the hexagonal pyramid.

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

[0011] Preferably, the top plate is in the shape of an annular disk, with six T-slots evenly distributed in a ring on the top surface of the top plate, and each T-slot is distributed along the radial direction of the top plate.

[0012] Preferably, the bottom surface of the recessed module is provided with a slot, the top of the T-shaped slider is inserted into the slot of the recessed module, and the T-shaped slider and the recessed module are connected by screws; the lower end surface of the recessed module is slidably engaged 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; the first bolt and the second bolt are respectively provided with hanging holes; 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 proposes a forming method for a grooved annular sheet metal part, which uses the above-mentioned forming mold and includes the following steps:

[0015] S1. Preparation of raw material: The raw material is an annular conical structure;

[0016] S2. Install the forming mold on the hydraulic press. The hydraulic press drives the upper template to move upward. After the hydraulic press push rod passes through the push rod hole of the lower template, it lifts the top plate and drives the expansion block to slide upward along the guide bar while moving radially inward.

[0017] S3. Place the raw material onto all the expansion blocks and place a pressure block on top of the expansion blocks;

[0018] S4. The hydraulic press drives the upper template downward, and the hydraulic press rod descends synchronously, causing the top plate to descend. The annular body of the upper template abuts against the pressure block and presses down the expansion block until the expansion block descends and moves radially outward to tighten the blank. 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 a hydraulic press to move the upper template upwards and remove the pressure block;

[0020] S6. Using a hydraulic press to drive the upper template downwards, the hydraulic press's push rod descends synchronously, causing the top plate to descend. The annular body of the upper template pushes the expansion block downwards while moving radially outwards, and the wedge ring pushes the concave module to move radially inwards; until the expansion block, the blank, and the concave module are completely in contact, pressing out the annular groove on the part.

[0021] S7. After holding the pressure, the upper template is moved upward by the hydraulic press, the wedge ring disengages from the concave module, and the concave module moves outward and separates from the molded part under the action of the return spring; the top plate is lifted by the push rod of the hydraulic press, and the expansion block moves radially inward while sliding upward along the guide strip, so that the molded part is separated from the expansion block and can be taken out.

[0022] Preferably, in step S2, after the molding die is installed on the hydraulic press, the axial position height of the top plate needs to be adjusted so that the top surface of the top plate contacts the lower end surface of the expansion block. The adjustment method is to select an adjustment plate of suitable thickness and place the adjustment plate between the lower template 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 groove on the reinforcing rib part is integrally pressed into the molding die provided by the present invention using a circular cone-shaped blank, which effectively overcomes the problem of misalignment of the joint surface caused by the three-section welding method in the prior art. The integral molding method of the circular cone blank results in a stable part surface, high dimensional and positional accuracy, and improved molding efficiency.

[0025] (2) By using the molding die provided by this invention, after the part is formed, the upper template is driven upward by the hydraulic press, the wedge ring disengages from the concave module, and the concave module moves outward and separates from the formed part under the action of the return spring; the top plate is lifted by the push rod of the hydraulic press, and the expansion block moves radially inward while sliding upward along the guide strip, so that the formed part disengages from the expansion block and can be taken out. Compared with the molding correction die used in the prior art, the part is easier to take out after molding.

[0026] (3) By using the molding mold and method provided by the present invention, the integral molding method of the grooved ring sheet metal part is realized by means of hydraulic press and molding mold, and by means of bulging and extrusion. This method simplifies the process, solves the cumbersome process of molding this part in multiple processes and the disadvantages such as poor part molding state and inconvenient operation. Only one set of tooling is needed to form a qualified part with stable surface at one time, which greatly shortens the part processing cycle and makes the operation simple for workers, and the material handling is safe and convenient.

[0027] (4) The molding die provided by the present invention has a simple structure, reliable operation, and the parts formed in batches have stable surface, and the size and position accuracy meet the design requirements, thus improving the product quality of the molding process. Attached Figure Description

[0028] 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.

[0029] Figure 1 A structural schematic diagram of a reinforcing rib component on an aircraft engine;

[0030] Figure 2 This is a schematic diagram of the single-segment molding die structure used in the existing process;

[0031] Figure 3 This is a schematic diagram of the scribe-type tire structure used in existing processes;

[0032] Figure 4 This is a schematic diagram of the forming and correcting mold structure used in the existing process;

[0033] Figure 5 A structural schematic diagram of a one-third-strength reinforcing rib part;

[0034] Figure 6 This is a schematic diagram of the molding die provided by the present invention;

[0035] Figure 7 This is a partial top view of the molding die provided by the present invention when the six expansion blocks are evenly distributed in a ring.

[0036] Figure 8 for Figure 7 Sectional view of AA;

[0037] Figure 9 This is a partial top view of the molding die provided by the present invention when the six concave modules are evenly distributed in a ring.

[0038] Figure 10 for Figure 9 Middle BB cross-section;

[0039] Figure 11 This is a partial top view of the top plate in the molding die provided by the present invention;

[0040] Figure 12 for Figure 11 A-direction view;

[0041] Figure 13 This is a cross-sectional view of the wedge-shaped ring in the molding die provided by the present invention;

[0042] Figure 14 This is a top view of the cone in the molding die provided by the present invention;

[0043] Figure 15 for Figure 14 CC section view;

[0044] Figure 16 This is a schematic diagram of the structure of the wool material in this invention.

[0045] The reference numerals in the attached diagrams are as follows: 1. Lower template; 1a. Top rod hole; 2. Adjusting plate; 3. Top plate; 3a. T-slot; 4. T-slider; 5. Concave module; 5a. Protrusion; 5b. Slot; 6. Expansion block; 6a. Groove; 6b. Slide groove; 6c. Sliding surface; 7. Cone; 7a. Hexagonal pyramid; 7b. Stepped cylinder; 7c. Through groove; 8. Guide strip; 9. Wedge ring; 10. Upper template; 10a. Ring body; 11. Pressure block; 12. Return spring; 13. First bolt; 14. Second bolt; 15. Raw material. Detailed Implementation

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] 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.

[0048] 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.

[0049] Combination Figures 6 to 15 The image shows a specific embodiment of a forming mold for a grooved annular sheet metal part provided by the present invention. The forming mold includes a lower mold plate 1 and an upper mold plate 10. A cone 7 is installed on the lower mold plate 1, and multiple guide strips 8 are evenly distributed on the cone 7. An expansion 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 expansion 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 groove 3a of the top plate 3. A recessed module 5 is installed on the slider 4; a return spring 12 is provided between the top plate 3 and the T-shaped slider 4, and the return spring 12 exerts 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 of the lower surface of the upper template 10; when the mold is closed, the lower end face 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 recessed module 5, and pushes the recessed 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 by six guide bars 8. A sliding groove 6b with a taper of 15° is opened on the expansion block 6, that is, the angle between the sliding groove 6b and the bottom surface of the expansion block 6 is 15°. The cross-section of the sliding groove 6b is T-shaped. The cross-section of the guide bar 8 is T-shaped. The guide bar 8 and the sliding groove 6b are in sliding fit.

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

[0052] Combination Figure 6 , Figure 8 and Figure 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 into profiles for pressing the blank 15. A groove 6a is provided on the outer conical surface of the expansion block 6; a protrusion 5a is provided on the inner conical surface of the concave module 5. When pressing the blank 15, the expansion block 6, the blank 15 and the concave module 5 are completely fitted together to press out the annular groove on the part.

[0053] In this embodiment, the wedge ring 9 is a circular ring structure, connected to the upper template 10 by screws and pins. The inner surface of the wedge ring 9 is a 15° conical surface, and the outer conical surface of the concave module 5 is also a 15° conical surface. When the mold is closed, the inner conical surface of the wedge ring 9 engages with the outer circumferential surface of the concave module 5, thus pushing the concave module 5 radially inward on the top surface of the top plate 3. When the mold is opened, the wedge ring 9 disengages from the concave module 5, and the concave module 5 retracts under the action of the return spring 12.

[0054] In this embodiment, an adjusting plate 2 is provided between the lower template 1 and the top plate 3. By selecting an adjusting plate 2 of suitable thickness and placing it between the lower template 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 Figure 14 , Figure 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°, and a through groove 7c is formed on the pyramidal surface of the hexagonal pyramid 7a. 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, which slides in cooperation with the pyramidal surface of the hexagonal pyramid 7a.

[0056] Combination Figure 6 , Figure 15 As shown, the cone 7 is inserted into the central through hole of the lower template 1 through a stepped cylinder 7b, and the stepped 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 Figure 12 , Figure 13The top plate 3 shown is an annular disc shape, with six T-slots 3a evenly distributed in a ring on the top surface of the top plate 3, and each T-slot 3a is distributed radially along the top plate 3. In this embodiment, the main functions of the top plate 3 are: firstly, to serve as a sliding mounting base for the recessed module 5; and secondly, to lift the expansion block 6 when the hydraulic press's push rod passes through the push rod hole 1a of the lower template 1 and lifts the top plate 3.

[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; the first bolt 13 and the second bolt 14 are respectively provided with hanging holes; 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 , Figure 16 As shown, this embodiment also provides a method for forming a grooved annular sheet metal part, using the above-mentioned forming mold, including the following steps:

[0060] S1. Preparation of raw material 15: The raw material 15 is an annular conical structure.

[0061] S2. Install the molding die on the hydraulic press. The hydraulic press drives the upper template 10 to move upward. After the hydraulic press push rod passes through the push rod hole 1a of the lower template 1, it lifts the top plate 3, causing the expansion block 6 to slide upward along the guide bar 8 while moving radially inward.

[0062] S3. Place the raw material 15 onto all the expansion blocks 6, and place the pressure block 11 on top of the expansion blocks 6.

[0063] S4. The hydraulic press drives the upper template 10 downwards, and the hydraulic press's push rod descends synchronously, causing the top plate 3 to descend. The annular body 10a of the upper template 10 abuts against the pressure block 11 and presses down the expansion block 6 until the expansion block 6 descends and moves radially outwards to tighten the blank 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. The blank 15 is completely attached to the expansion block 6. In this way, with a support surface, the blank 15 moves evenly under force, avoiding deviation and abrupt changes.

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

[0065] S6. Using a hydraulic press to drive the upper template 10 downward, the hydraulic press's push rod descends synchronously, causing the top plate 3 to descend. The annular body 10a of the upper template 10 pushes the expansion block 6 downward while moving radially outward, and the wedge ring 9 pushes the concave module 5 radially inward; until the expansion block 6, the blank 15 and the concave module 5 are completely fitted together, pressing out the annular groove on the part.

[0066] S7. After holding the pressure, the upper template 10 is driven upward by the hydraulic press, the wedge ring 9 is disengaged from the concave module 5, and the concave module 5 moves outward and separates from the molded part under the action of the return spring 12; the top plate 3 is lifted by the push rod of the hydraulic press, and the expansion block 6 moves radially inward while sliding upward along the guide bar 8, so that the molded part is separated from the expansion block 6 and can be taken out.

[0067] In step S2, after the molding die is installed on the hydraulic press, the axial position height of the top plate 3 needs to be adjusted so that the top surface of the top plate 3 contacts the lower end surface of the expansion block 6. The adjustment method is to select an adjustment plate 2 of suitable thickness and place the adjustment plate 2 between the lower template 1 and the top plate 3.

[0068] 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 forming mold for a grooved annular sheet metal part, characterized in that: It includes 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 an expansion 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) abuts 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 recessed 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 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 provided at the center of the lower surface of the upper template (10); a groove (6a) is provided on the outer conical surface of the expansion block (6); and a protrusion (5a) is provided on the inner conical surface of the recessed module (5). When the mold is closed, the lower end face of the ring body (10a) abuts against the top surface of the expansion block (6) and pushes 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; The top plate (3) is in the shape of an annular disk, and there are six T-shaped grooves (3a) evenly distributed in an annular pattern on the top surface of the top plate (3), and each T-shaped groove (3a) is distributed along the radial direction of the top plate (3); The bottom surface of the recessed module (5) is provided with a slot (5b), the top of the T-shaped slider (4) is inserted into the slot (5b) of the recessed module (5), and the T-shaped slider (4) and the recessed module (5) are connected by screws; the lower end surface of the recessed module (5) slides with the top surface of the top plate (3); A first bolt (13) is installed on the top plate (3), and a second bolt (14) is installed on the T-shaped slider (4); a hanging hole is 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).

2. The forming mold for a grooved annular sheet metal part as described in claim 1, characterized in that: An adjustment plate (2) is provided between the lower template (1) and the top plate (3).

3. The forming mold for a grooved annular sheet metal part as described in claim 1, characterized in that: A groove (6b) with a taper of 15° is provided on the expansion block (6), and the cross-section of the groove (6b) is T-shaped; the cross-section of the guide strip (8) is T-shaped; the guide strip (8) slides in conjunction with the groove (6b).

4. The forming mold for a grooved annular sheet metal part as described 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 screws; an inclined sliding surface (6c) is provided on the expansion block (6), and the sliding surface (6c) slides in cooperation with the pyramidal surface of the hexagonal pyramid (7a).

5. The forming mold for a grooved annular sheet metal part as described in claim 4, characterized in that: The cone (7) is inserted into the central through hole of the lower template (1) through a stepped cylinder (7b), and the stepped 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 method for forming a grooved annular sheet metal part, characterized in that, The molding die according to any one of claims 1 to 5 includes the following steps: S1. Preparation of raw material (15): The raw material (15) is an annular conical structure; S2. Install the molding die on the hydraulic press. The hydraulic press drives the upper template (10) to move upward. After the hydraulic press push rod passes through the push rod hole (1a) of the lower template (1), it lifts the top plate (3) and drives the expansion block (6) to slide upward along the guide strip (8) while moving radially inward. S3. Place the raw material (15) onto all the expansion blocks (6) and place the pressure block (11) on top of the expansion blocks (6). S4. The hydraulic press drives the upper template (10) to descend, and the hydraulic press rod descends synchronously, causing the top plate (3) to descend. The annular body (10a) of the upper template (10) abuts against the pressure block (11) and presses down the expansion block (6) until the expansion block (6) descends and moves radially outward to tighten the rough 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. Use a hydraulic press to move the upper template (10) upward and remove the pressure block (11). S6. Using a hydraulic press to drive the upper template (10) downward, the hydraulic press's push rod descends synchronously, causing the top plate (3) to descend. The annular body (10a) of the upper template (10) pushes the expansion block (6) downward while moving radially outward, and the wedge ring (9) pushes the concave module (5) radially inward; until the expansion block (6), the blank (15) and the concave module (5) are completely fitted together, pressing out the annular groove on the part; S7. After holding the pressure, the upper template (10) is driven upward by the hydraulic press, the wedge ring (9) is separated from the concave module (5), and the concave module (5) moves outward and separates from the molded part under the action of the return spring (12); the top plate (3) is lifted by the top rod of the hydraulic press, and the expansion block (6) moves radially inward while sliding along the guide strip (8), and the molded part is separated from the expansion block (6), and the molded part can be taken out.

7. The forming method of a grooved annular sheet metal part as described in claim 6, characterized in that, In step S2, after the molding die is installed on the hydraulic press, the axial position height of the top plate (3) needs to be adjusted so that the top surface of the top plate (3) contacts the lower end surface of the expansion block (6). The adjustment method is to select an adjustment plate (2) of suitable thickness and place the adjustment plate (2) between the lower template (1) and the top plate (3).

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