Large-diameter end socket forging forming device and forging method

Abstract

The invention discloses a large-diameter end socket forging forming device and a forging method, and relates to the technical field of large-diameter end sockets, and the large-diameter end socket forging forming device comprises a pressure device which is used for driving a male die and a limiting ring to independently move in the vertical direction; the base is arranged below the pressure equipment; a material sheet is placed on the female die assembly and passes through the female die assembly; the first guiding assembly and the second guiding assembly play a guiding role in the material sheet placing process so that the material sheets can be guided to the first guiding assembly, and the first guiding assembly centers the material sheets after receiving the material sheets so that the falling point center of the material sheets can coincide with the center of the female die assembly. Through the guiding function of the second guiding assembly and the centering function of the first guiding assembly, material sheets can accurately fall into the center of the female die assembly, automatic centering is achieved, manual intervention is not needed, the material sheet placing speed is high, and the production efficiency is improved while the safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of large-diameter heads, in particular to a large-diameter head forging device and a forging method. Background Art

[0002] Large-diameter hemispherical heads have uniform curvature radius and the most uniform force. When subjected to the same pressure, they require the smallest wall thickness and save significant material. In industrial production, they are often used in high-pressure or ultra-large diameter containers. As key components of large equipment such as pressure vessels and chemical equipment, the forging quality of large-diameter heads is directly related to the overall safety and operational stability of the equipment.

[0003] At present, during the production process of large-diameter heads, during the sheet placement stage, the sheet is lifted by the workshop crane and placed in the mold, and forged by a hydraulic press. During this process, due to the lack of efficient and accurate guiding and centering structures, manual handheld hooks are required to assist in positioning the sheet during its descent. The center of the sheet is prone to deviate from the center of the die assembly, which has a negative impact on the molding quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a large-diameter head forging device and forging method to solve the deficiencies in the above-mentioned prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a large diameter head forging device, comprising:

[0006] A pressure device, which is used to drive the punch and the limit ring to move independently in the vertical direction;

[0007] a base, which is disposed below the pressure equipment;

[0008] A female mold assembly, on which the blank is placed;

[0009] The first guide assembly and the second guide assembly, during the process of placing the sheet, the second guide assembly plays a guiding role so that the sheet is guided to the first guide assembly, and the first guide assembly centers the sheet after receiving it so that its landing center coincides with the center of the die assembly.

[0010] Preferably, the die assembly comprises:

[0011] The lower die base is fixed on the base through supporting legs;

[0012] A lower plate fixed to the lower die base;

[0013] A rotating plate rotatably connected to the lower die base;

[0014] The die is mounted on the lower die base and is fixedly connected to the lower pad.

[0015] Preferably, the second guide assembly includes a stand and a guide column, a plurality of the stand are mounted on the rotating plate, and the guide column is rotatably connected to the stand. An arc chamfer is provided at one end of the guide column close to the limiting ring.

[0016] Preferably, a leakage hole connecting the inner and outer walls of the lower die base is provided in the lower die base, wherein the lower portion of one end of the leakage hole is flush with the upper portion of the rotating plate.

[0017] Preferably, the first guide assembly includes:

[0018] A sliding frame, a centering block, a driving disk, and a second elastic member, wherein the sliding frame is slidably connected to the rotating plate, the second elastic member applies a thrust toward the center of the rotating plate to the sliding frame, the centering block is rotatably connected to the sliding frame, and the driving disk is fixedly mounted at both ends of the centering block;

[0019] The floating avoidance part includes a slide groove, an insertion column, a connecting column, a tension piece, and an annular groove. The annular groove is opened in the lower pad, the slide groove is opened on the driving disk, the insertion column is slidably inserted on the sliding frame, the connecting column is rotatably connected to the upper part of the insertion column, one end of the connecting column is inserted into the slide groove, and the tension piece applies downward pulling force to the insertion column.

[0020] Preferably, one end of the centering block is adapted to the material sheet, and an annular groove is provided on the outside of the limiting ring. When the limiting ring moves downward, the guide column moves along the annular groove.

[0021] Preferably, the pressure device is provided with a first hydraulic cylinder for driving the displacement of the punch, and the pressure device is provided with a second hydraulic cylinder for driving the displacement of the limit ring.

[0022] Preferably, the base can be moved sideways to drive the die assembly away from under the pressure equipment.

[0023] Preferably, it also includes at least two groups of lifting components, which are respectively arranged below the pressure equipment and on the lateral movement path of the base, and are used to support the formed sheet.

[0024] A large diameter head forging method comprises the following steps:

[0025] S1: The base drives the die assembly to move sideways, and then hoist the blank to the top of the die assembly. During the placement of the blank, the second guide assembly is used to guide the blank along the guide column to the first guide assembly. After the first guide assembly receives the blank, the centering block is pressed and flipped to achieve positioning and clamping of the blank, so that the center of the blank landing point coincides with the center of the die assembly. At this time, the drive disk drives the plug column to move upward;

[0026] S2, start the pressure equipment, and use the second hydraulic cylinder to drive the limit ring to move downward in the vertical direction. During the downward movement of the limit ring, the guide column moves along the annular groove outside the limit ring until the limit ring presses and fixes the edge of the sheet. Then, the first hydraulic cylinder drives the punch to move downward in the vertical direction. The punch gradually approaches and contacts the sheet, performing the first forging forming on the sheet. Then, the second hydraulic cylinder drives the limit ring to move upward, and the first hydraulic cylinder drives the punch to continue to move downward, performing the second forging forming on the sheet.

[0027] S3, after the blank is forged, the first hydraulic cylinder drives the punch to move upward and reset, controls the side movement of the base, drives the die assembly to leave the bottom of the pressure equipment, starts the lifting assembly, and the lifting assembly rises from the bottom of the base to support the formed blank and remove the forming head from the die assembly.

[0028] In the above technical solution, the present invention provides a large-diameter head forging device and forging method. Through the guiding effect of the second guide component and the centering function of the first guide component, the sheet can accurately fall on the center of the die assembly, so that the sheet is accurately centered. There is no need to deliberately increase the margin when preparing the material, which reduces costs, significantly improves the head forming accuracy, and automatically centers without manual intervention. The sheet placement speed is fast, and production efficiency is accelerated while safety is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0030] Figure 1 This is a schematic diagram of the overall structure of a large-diameter head forging device and forging method of the present invention;

[0031] Figure 2 This is a schematic structural diagram of a large-diameter head forging device and forging method according to the present invention when no blanks are placed;

[0032] Figure 3 This is an appendix to the invention of a large diameter head forging device and forging method Figure 2 A in the middle is an enlarged schematic diagram;

[0033] Figure 4 This is a schematic structural diagram of a large-diameter head forging device and forging method according to the present invention after the sheet is placed;

[0034] Figure 5 This is an appendix to the invention of a large diameter head forging device and forging method Figure 4 The enlarged schematic diagram of point B in the middle;

[0035] Figure 6 This is a schematic structural diagram of a large-diameter head forging device and forging method according to the present invention after a limiting ring presses down a sheet;

[0036] Figure 7 This is an appendix to the invention of a large diameter head forging device and forging method Figure 6 The enlarged schematic diagram of point C in the middle;

[0038] Figure 8 This is a schematic diagram of a large-diameter head forging device and method according to the present invention, when the punch is pressed down to the first forging process;

[0039] Figure 9 This is an appendix to the invention of a large diameter head forging device and forging method Figure 8 The enlarged schematic diagram of point D in the middle;

[0040] Figure 10 This is a schematic diagram of a large-diameter head forging device and method according to the present invention, during which the punch is pressed down to perform secondary forging;

[0041] Figure 11 The present invention provides a schematic diagram of the floating avoidance structure of a large-diameter head forging device and forging method.

[0042] Explanation of the accompanying drawings: 1. Pressure equipment; 11. First hydraulic cylinder; 12. Second hydraulic cylinder; 2. Punch; 3. Limiting ring; 31. Annular groove; 4. Base; 5. Die assembly; 51. Lower die base; 52. Lower pad; 53. Rotating plate; 54. Die; 511. Leakage hole; 521. Annular groove; 6. First guide assembly; 61. Sliding frame; 62. Centering block; 63. Driving disk; 64. Insert column; 65. Tension member; 66. Second elastic member; 631. Slide groove; 641. Connecting column; 7. Second guide assembly; 71. Stand; 72. Guide column; 8. Sheet; 9. Lifting assembly. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] See also Figure 1-11 , an embodiment of the present invention provides a large diameter head forging device, comprising:

[0045] The pressure device 1 is used to drive the punch 1 and the limit ring 3 to independently move in the vertical direction;

[0046] a base 4 disposed below the pressure device 1;

[0047] The die assembly 5, the sheet 8 is placed on the die assembly 5;

[0048] The first guide assembly 6 and the second guide assembly 7 play a guiding role during the placement of the sheet 8, so that the sheet 8 is guided to the first guide assembly 6. After receiving the sheet 8, the first guide assembly 6 centers it so that the center of its landing point coincides with the center of the die assembly 5.

[0049] The sheet 8 is hoisted by a crane. The sheet 8 is first preliminarily positioned by the second guide assembly 7 so that it is confined within the positioning range, so that the sheet 8 can smoothly fall to the first guide assembly 6. Then, through the centering of the first guide assembly 6, the sheet 8 can fall onto the die assembly 5. In this way, the difficulty of placing the sheet 8 during the hoisting process is greatly reduced, and no manual auxiliary positioning is required, which greatly improves the safety of the sheet 8 during placement.

[0050] In an embodiment of the present invention, the female mold assembly 5 includes:

[0051] The lower die base 51 is fixed on the base 4 via legs;

[0052] A lower plate 52 fixed to the lower die base 51;

[0053] A rotating plate 53 is rotatably connected to the lower die base 51;

[0054] The female die 54 is mounted on the lower die base 51 and fixedly connected to the lower pad 52 .

[0055] See also Figure 2 and Figure 3 The punch 2 and the limiting ring 3 are driven to move independently by the pressure equipment 1, and the forging operation is realized by cooperating with the die assembly 5 on the base 4. The lower die seat 51 of the die assembly 5 provides rigid support, the lower pad 52 plays a supporting and buffering role, and the die 54 is a forming cavity. The first guide assembly 6 and the second guide assembly 7 cooperate to complete the precise centering of the sheet 8. By centering, limiting and fixing the sheet 8, the product quality and safety of the production process are improved.

[0056] In the embodiments of the present invention, please refer to Figure 2-4 The second guide assembly 7 includes a stand 71 and a guide column 72. Several of the stand 71 are installed on the rotating plate 53. The guide column 72 is rotatably connected to the stand 71. The guide column 72 is provided with an arc chamfer at one end close to the limit ring 3. The stand 71 is dispersed with the die 54 as the center. During the downward movement of the sheet 8, its shaking is limited by the stand 71 and the guide column 72 to ensure that it falls smoothly on the first guide assembly 6.

[0057] The second guide assembly 7 plays a precise guiding role in the placement process of the sheet 8 through the guiding effect of the stand 71 and the guide post 72. First, the stand 71 serves as a supporting base and is dispersedly installed on the rotating plate 53 with the die 54 as the center to form a guide frame surrounding the die 54. This distribution method causes the space between the stand 71 and the first guide assembly 6 to gradually decrease. The stand 71 and the guide post 72 are used to preliminarily limit the lateral offset range of the sheet 8, and the guide post 72 is rotatably connected to the stand 71 and can rotate flexibly around its own axis. When the sheet 8 moves downward from the top, it first contacts the guide post 72. The rotation characteristics of the guide post 72 convert the sliding friction between the sheet 8 and the guide post 72 into rolling friction The sheet 8 is rubbed, which greatly reduces the resistance to the downward movement of the sheet 8 and avoids scratches on the surface of the sheet 8 or obstruction of the downward movement due to excessive friction. At the same time, the circular chamfer design of the guide column 72 near the end of the limit ring 3 can effectively eliminate the obstruction of the sharp edges to the sheet 8, avoid the sheet 8 from bouncing or deflecting due to rigid collision, and further stabilize the downward movement trajectory of the sheet 8. Finally, under the joint constraints of multiple groups of guide columns 72, the sheet 8 is accurately guided to the first guide component 6. Therefore, the second guide component 7 reduces the space of the stand 71, the rotation characteristics of the guide column 72 reduce friction, and the circular chamfer eliminates obstruction. The three work together to achieve stable guidance of the sheet 8 during its downward movement, ensuring that it smoothly enters the centering range of the first guide component 6.

[0058] In another embodiment of the present invention, please refer to Figure 2 A leakage hole 511 is opened in the lower mold base 51 to connect the inner and outer walls thereof, wherein the lower end of the leakage hole 511 is flush with the upper part of the rotating plate 53.

[0059] During the pressing process of the large-diameter head, when the high-temperature sheet 8 is in contact with the air and cooled, oxide scale will be generated on the surface. As the forging continues, the oxide scale gradually falls off under the extrusion of the punch 2, the deformation of the sheet 8 and the rotation of the rotating plate 53. The fallen oxide scale will first fall on the upper surface of the rotating plate 53. Since the lower end of the leakage hole 511 is flush with the upper part of the rotating plate 53, the oxide scale can smoothly slide into the entrance of the leakage hole 511. At the same time, the leakage hole 511 is connected to the inner and outer walls of the lower die base 51 to form a through discharge channel. The oxide scale entering the leakage hole 511 can be quickly discharged to the outside of the lower die base 51 along the channel under the push of gravity, avoiding accumulation inside the die assembly 5, preventing the oxide scale from accumulating in the cavity of the die 54 or the surface of the rotating plate 53 to affect the forging accuracy, avoiding wear of the die by the oxide scale, and avoiding obstruction to the next placement of the sheet 8, thereby ensuring the long-term stable operation of the die assembly 5 and indirectly improving the forming quality of the head.

[0060] In an embodiment of the present invention, the first guide assembly 6 includes:

[0061] The sliding frame 61, the centering block 62, the driving plate 63, and the second elastic member 66 are provided. The sliding frame 61 is slidably connected to the rotating plate 53. The second elastic member 66 applies a thrust to the sliding frame 61 toward the center of the rotating plate 53. The centering block 62 is rotatably connected to the sliding frame 61. The driving plate 63 is fixedly mounted at both ends of the centering block 62.

[0062] The floating avoidance part includes a slide groove 631, an insertion column 64, a connecting column 641, a tension piece 65, and an annular groove 521. The annular groove 521 is opened in the lower pad 52, the slide groove 631 is opened on the driving disk 63, the insertion column 64 is slidably inserted on the sliding frame 61, the connecting column 641 is rotatably connected to the upper part of the insertion column 64, one end of the connecting column 641 is inserted into the slide groove 631, and the tension piece 65 applies downward pulling force to the insertion column 64.

[0063] First, the end of the centering block 62 close to the center of the die 54 is tilted, showing a larger upper part and a smaller lower part. At this time, its end surface forms an inclined surface (as shown in the attached figure). Figure 3 As shown in FIG5 , this structure provides a guide entrance for the sheet 8 to fall, so that the sheet 8 can move downward after accurately contacting the centering block 62. At this time, the lower end of the plug post 64 is inserted into the annular groove 521 of the lower pad 52. At this time, the sliding frame 61 is limited and cannot move radially along the rotating plate 53.

[0064] When the sheet 8 is guided by the second guide assembly 7 and falls to the first guide assembly 6, the sheet 8 first contacts the inclined surface of the centering block 62, and squeezes the centering block 62 under the action of its own gravity, forcing the centering block 62 to rotate (turn over) around the sliding frame 61. In this way, during the turning process of the centering block 62, the end close to the center is gradually flattened, generating a radial centripetal squeezing force on the edge of the sheet 8. By utilizing the synchronous action of multiple groups of centering blocks 62, the sheet 8 is pushed to a position that coincides with the center of the die 54, completing the centering. Synchronously, the turning of the centering block 62 drives the driving discs 63 at both ends to rotate synchronously, so that the slide grooves 631 on the driving disc 63 rotate with it, and through the cooperation with the connecting column 641, the plug column 64 is pushed to overcome the pulling force of the tension member 65 and slide upward, and finally the lower end of the plug column 64 is separated from the annular groove 521. At this time, the limit of the sliding frame 61 is released and it can move freely radially along the rotating plate 53.

[0065] Then, the first forging is performed, the limit ring 3 is moved down and pressed, the punch 2 is moved down and pressed, and the sheet 8 is formed as shown in the attached figure. Figure 9 At this time, the secondary forging process begins. The limit ring 3 moves upwards and the punch 2 continues to move downwards until the following state is formed: Figure 9When the edge of the sheet 8 is lifted up and contacts the centering block 62, the centering block 62 will be pushed to drive the sliding frame 61 to move radially outward to overcome the elastic force of the second elastic member 66, so as to realize the design of giving way out synchronously with the deformation of the sheet 8, avoiding the obstruction of the first guide component 6 on the edge of the sheet 8 to the lifting of the edge, preventing the edge of the sheet 8 from producing irregular arc angles or wrinkles due to extrusion, ensuring the straightness and integrity of the edge of the blank after forming, and providing a precise reference for subsequent groove cutting and other processes. In this way, the first guide component 6 realizes the initial inclined surface guidance, flip extrusion centering, and adaptive avoidance after the final unlocking, which not only realizes the high-precision centering of the sheet 8, but also avoids interference with the forging process by dynamic giving way, improving the centering efficiency while ensuring the edge forming quality of the large-diameter head.

[0066] In an embodiment of the present invention, one end of the centering block 62 is adapted to the material piece 8, and an annular groove 31 is provided on the outside of the limiting ring 3. When the limiting ring 3 moves downward, the guide column 72 moves along the annular groove 31 to realize the rotation of the rotating plate 53.

[0067] One end of the centering block 62 is adapted to the outer cylindrical surface of the sheet 8. This adaptability enables the centering block 62 to form surface contact with the sheet 8, so as to maintain the centering position of the sheet 8 through uniform extrusion force, and the annular groove 31 outside the limiting ring 3 is not a simple vertical groove, but is designed with a specific spiral trajectory. When the limiting ring 3 moves vertically downward under the drive of the second hydraulic cylinder 12, the guide column 72 is embedded in the annular groove 31 and slides along the groove. The circumferential trajectory of the annular groove 31 will generate a lateral thrust on the guide column 72, forcing the guide column 72 to move downward synchronously with the limiting ring 3 and generate a circumferential rotation around the center of the die 54. Since the guide column 72 is fixedly connected to the rotating plate 53 through the stand 71, this circumferential rotation will be transmitted to the rotating plate 53 through the stand 71, and the centering block 62 will also rotate synchronously. In this way, the rotation of the centering block 62 can also be used to scrape the outside of the sheet 8 to remove the oxide layer, and at the beginning of the secondary forging, since the limit ring 3 is first moved upward, the centering block 62 can be rotated and reset, so that secondary scraping can be performed to further improve the cleaning effect.

[0068] In yet another embodiment of the present invention, the pressure device 1 is provided with a first hydraulic cylinder 11 for driving the displacement of the punch 2 , and the pressure device 1 is provided with a second hydraulic cylinder 12 for driving the displacement of the limit ring 3 .

[0069] The base 4 can move sideways to drive the die assembly 5 away from under the pressure equipment 1 .

[0070] It also includes at least two groups of lifting components 9, which are respectively arranged below the pressure equipment 1 and on the lateral movement path of the base 4, and are used to support the formed sheet 8.

[0071] In this embodiment, the first hydraulic cylinder 11 drives the punch 2 to complete the forging and forming of the sheet 8, and the second hydraulic cylinder 12 drives the limit ring 3 to pre-fix the edge of the sheet 8 and indirectly drive the rotating plate 53. The timing and force of the two actions can be adjusted separately, avoiding interference while ensuring forging accuracy.

[0072] The design of the base 4 being able to move sideways further enhances the operational flexibility of the device. After forging is completed, the base 4 drives the die assembly 5 to move out from under the pressure equipment 1 as a whole, so that the formed sheet 8 is separated from the forging area. This not only facilitates the operator to perform maintenance on the die assembly 5, but also provides sufficient space for the subsequent removal process, thus reducing the idle time of the equipment.

[0073] The arrangement of at least two sets of lifting assemblies 9 forms a double-station lifting system. The lifting assembly 9 located below the pressure equipment 1 can initially support the formed sheet 8 to move upward after the forging is completed and the punch 2 and the limit ring 3 are reset. The lifting assembly located on the side movement path of the base 4 can further stabilize and lift the sheet 8 after the die assembly 5 moves into place with the base 4, so as to facilitate safe removal.

[0074] After the die-casting is completed, the lifting assembly 9 located below the pressure equipment 1 can be directly used to lift it, and then the forklift equipment can be used for transfer.

[0075] A large diameter head forging method comprises the following steps:

[0076] S1, the base 4 drives the die assembly 5 to move sideways, and then hoist the blank 8 to the vicinity of the upper part of the die assembly 5. During the placement of the blank 8, the second guide assembly 7 is used to guide the blank 8 along the guide column 72 to the first guide assembly 6. After the first guide assembly 6 receives the blank 8, the centering block 62 is pressed and flipped to achieve positioning and clamping of the blank 8, so that the center of the landing point of the blank 8 coincides with the center of the die assembly 5. At this time, the drive disk 63 drives the plug column 64 to move upward;

[0077] S2, start the pressure device 1, and drive the limiting ring 3 to move downward in the vertical direction by the second hydraulic cylinder 12. During the downward movement of the limiting ring 3, the guide column 72 moves along the annular groove 31 outside the limiting ring 3 until the limiting ring 3 presses and fixes the edge of the sheet 8. Then, the punch 2 is driven downward in the vertical direction by the first hydraulic cylinder 11. The punch 2 gradually approaches and contacts the sheet 8, performing the first forging forming on the sheet 8. Then, the limiting ring 3 is driven upward by the second hydraulic cylinder 12, and the punch 2 is driven downward by the first hydraulic cylinder 11 to perform the secondary forging forming on the sheet.

[0078] S3, after the sheet 8 is forged, the first hydraulic cylinder 11 drives the punch 2 to move upward and reset, controls the base 4 to move sideways, drives the die assembly 5 to leave the bottom of the pressure equipment 1, starts the lifting assembly 9, and the lifting assembly 9 rises from the bottom of the base 4 to support the formed sheet 8 and remove the formed head from the die assembly 5.

[0079] In the above method, through the cooperative mechanism of the preliminary guidance of the second guide assembly 7 and the flipping and centering of the first guide assembly 6, the rolling guidance of the guide column 72 and the adaptive flipping and extrusion of the centering block 62 are utilized to achieve automatic alignment of the center of the sheet 8 and the die assembly 5. In addition, the contour adaptation design of the centering block 62 and the sheet 8 is combined to significantly reduce manual intervention errors and improve positioning efficiency.

[0080] This innovative process design utilizes a pre-pressing and fixing process with a limiting ring 3 followed by two forging presses: the first forging press achieves initial forming under the constraint of the limiting ring 3, preventing the blank from slipping. The second forging press releases the constraint of the limiting ring 3, allowing the blank 8 to expand freely. By releasing deformation stress in stages, the curved surface of the head is formed more uniformly, making it particularly suitable for the thick-walled forming requirements of large-diameter heads. Furthermore, through the design of first constraining and then releasing, the first forging press, under the fixation of the limiting ring 3, forces the material to preferentially expand axially along the cavity of the die 54, preventing the edge from turning outward due to lack of constraints. After the second forging press releases the constraint, the material turns radially under the continued pressure of the punch 2, gradually extending the curved surface from the inside out. This staged approach of guiding plastic flow can significantly reduce uneven wall thickness.

[0081] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A large diameter head forging device, characterized in that: include: A pressure device (1) is used to drive the punch (2) and the limit ring (3) to independently move in the vertical direction; A base (4) is arranged below the pressure device (1); A die assembly (5), wherein the blank (8) is placed on the die assembly (5); The first guide assembly (6) and the second guide assembly (7) play a guiding role during the placement of the sheet (8), so that the sheet (8) is guided to the first guide assembly (6), and the first guide assembly (6) receives the sheet (8) and centers it so that the center of its landing point coincides with the center of the die assembly (5).

2. A large diameter head forging device according to claim 1, characterized in that: The die assembly (5) comprises: A lower die base (51) is fixed to the base (4) via legs; A lower pad (52) fixed to the lower die base (51); A rotating plate (53) rotatably connected to the lower die base (51); The die (54) is mounted on the lower die base (51) and fixedly connected to the lower pad (52).

3. A large diameter head forging device according to claim 1, characterized in that: The second guide assembly (7) includes a stand (71) and a guide post (72). A plurality of the stand (71) are mounted on the rotating plate (53). The guide post (72) is rotatably connected to the stand (71). An arc chamfer is provided at one end of the guide post (72) close to the limiting ring (3).

4. A large diameter head forging device according to claim 2, characterized in that: A material leakage hole (511) is provided in the lower die base (51) and connects the inner and outer walls thereof, wherein a lower portion of one end of the material leakage hole (511) is flush with the upper portion of the rotating plate (53).

5. A large diameter head forging device according to claim 2, characterized in that: The first guide assembly (6) comprises: A sliding frame (61), a centering block (62), a driving disk (63), and a second elastic member (66), wherein the sliding frame (61) is slidably connected to the rotating plate (53), the second elastic member (66) applies a thrust toward the center of the rotating plate (53) to the sliding frame (61), the centering block (62) is rotatably connected to the sliding frame (61), and the driving disk (63) is fixedly mounted on both ends of the centering block (62); The floating avoidance portion includes a slide groove (631), an insertion column (64), a connecting column (641), a tension member (65), and an annular groove (521). The annular groove (521) is provided in the lower pad (52), the slide groove (631) is provided on the driving disk (63), the insertion column (64) is slidably plugged into the sliding frame (61), the connecting column (641) is rotatably connected to the upper part of the insertion column (64), one end of the connecting column (641) is plugged into the slide groove (631), and the tension member (65) applies a downward pulling force to the insertion column (64).

6. A large diameter head forging device according to claim 5, characterized in that: One end of the centering block (62) is adapted to the material sheet (8), and an annular groove (31) is provided on the outside of the limiting ring (3).

7. The large diameter head forging device according to claim 1, characterized in that: The pressure device (1) is provided with a first hydraulic cylinder (11) for driving the punch (2) to move, and the pressure device (1) is provided with a second hydraulic cylinder (12) for driving the limit ring (3) to move.

8. The large diameter head forging device according to claim 1, characterized in that: The base (4) can be moved sideways to drive the die assembly (5) to leave the bottom of the pressure equipment (1).

9. The large diameter head forging device according to claim 1, characterized in that: It also includes at least two groups of lifting components (9), which are respectively arranged below the pressure equipment (1) and on the lateral movement path of the base (4), and are used to support the formed sheet (8).

10. A large diameter head forging method, which is implemented based on the large diameter head forging forming device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, the base (4) drives the die assembly (5) to move sideways, and then the sheet (8) is hoisted to the vicinity of the upper part of the die assembly (5). During the placement of the sheet (8), the second guide assembly (7) is used to guide the sheet (8) along the guide column (72) to the first guide assembly (6). After the first guide assembly (6) receives the sheet (8), the centering block (62) is pressed and turned over to achieve positioning and clamping of the sheet (8), so that the center of the sheet (8) landing point coincides with the center of the die assembly (5). At this time, the drive disc (63) drives the plug column (64) to move upward; S2, start the pressure device (1), drive the limiting ring (3) to move downward in the vertical direction through the second hydraulic cylinder (12), and during the downward movement of the limiting ring (3), the guide column (72) moves along the annular groove (31) outside the limiting ring (3) until the limiting ring (3) presses and fixes the edge of the sheet (8), and then, drive the punch (2) to move downward in the vertical direction through the first hydraulic cylinder (11), and the punch (2) gradually approaches and contacts the sheet (8), and performs the first forging and forming on the sheet (8), and then drives the limiting ring (3) to move upward through the second hydraulic cylinder (12), and the first hydraulic cylinder (11) drives the punch (2) to continue to move downward, and performs the second forging and forming on the sheet; S3, after the sheet (8) is forged, the first hydraulic cylinder (11) drives the punch (2) to move upward and reset, controls the base (4) to move sideways, drives the die assembly (5) to leave the bottom of the pressure equipment (1), starts the lifting assembly (9), and the lifting assembly (9) rises from the bottom of the base (4), supports the formed sheet (8), and removes the formed head from the die assembly (5).

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