Hubbed flange combined die forging forming device and method

Abstract

The invention relates to the field of forge piece forming and manufacturing, in particular to a hubbed flange combined die forging forming device and method.The hubbed flange combined die forging forming device comprises a die and a workbench used for being connected with the die, the workbench is provided with a die pressing end and a connecting end in an up-down corresponding mode, and the die pressing end is used for providing pressure needed by flange die forging forming; the connecting end is used for connecting and limiting the required mold and blank; by adopting the combined die design, synchronous forming of the large flange and the small flange can be achieved through one-time die forging by means of cooperation of the upper die, the lower die, the mold core and other components, multiple procedures in a traditional forming process are avoided, and therefore the material utilization rate and the production efficiency are directly improved.

Description

Technical Field

[0001] The invention relates to the field of forging forming and manufacturing, and in particular to a combined die forging forming device and method with a neck flange. Background Art

[0002] Flanges are widely used as key parts for connecting shaft pipes in equipment systems. The structural forms of flanges are generally divided into flat structures and neck structures. In neck flanges, if the neck is high, it is generally designed as a conical structure, often called a high neck flange or a welded neck flange. Neck flanges have a neck structure of a certain height. During the production and processing process, if the batch to be processed is large, die forging is usually used to improve production efficiency and reduce material consumption; if the batch is small, free forging can also be used and then the neck can be machined out by subsequent machining.

[0003] The existing processing methods for neck flanges are to uproot the bar blanks and then directly forge them, and then cut off the punched holes and skin after forming; or punch the uprooted cake blanks, and then forge the punched ring blanks. However, whether it is the removal of the skin after direct die forging of the cake blanks or the punching of the cake blanks before die forging of the ring blanks, it will cause a large waste of materials, especially for neck flanges with relatively large specifications, the proportion of the punched materials is more significant.

[0004] Therefore, based on the above-stated viewpoint, there is still room for optimization of the existing technical means for flange processing. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a combined die forging device with a neck flange, including a die and a workbench for connecting the die, the workbench is provided with a die end and a connecting end correspondingly at the upper and lower parts, the die end is used to provide the pressure required for the die forging of the billet, and the connecting end is used to connect and limit the required die and billet.

[0006] The mold comprises:

[0007] The upper die is connected to the die end and driven by the die end to slide in the vertical direction. The upper die protrudes outward, and the protruding section is concave to form a groove that is consistent with the outer edge contour of the small-sized flange after die pressing.

[0008] The lower die is connected to the connection end, and the lower die is concave to form a mounting groove for covering the upper die and the blank, and the mounting groove is further sunken to form a groove consistent with the outer edge contour of the large-size flange after die forming;

[0009] The core is coaxially connected to the lower die and slidably penetrates the upper die, and is used to maintain the axial correspondence between the upper die, the blank and the lower die.

[0010] Preferably, the size of the core is the same as the inner hole diameter of the small-sized flange.

[0011] Preferably, the blank is a ring blank with a middle punch hole. The volume of the ring blank is the total volume of the large and small necked flange forgings. The inner diameter of the ring blank is equal to the inner diameter of the small flange, and the outer diameter of the ring blank is equal to the outer diameter of the flange end of the large-sized necked flange forging.

[0012] Preferably, the connecting end includes connecting seats symmetrically arranged on the workbench and having a U-shaped structure. An installation plate for connecting and limiting the mold is commonly connected between all the connecting seats. The lower mold is limit-connected to the installation plate and axially corresponds to the pressing die end.

[0013] Preferably, the outer side of the lower mold is symmetrically connected with limiting arc plates. The side of the limiting arc plate away from the lower mold is connected with a driven slider. A driven screw rod is threadedly penetrated through the driven slider, and the driven screw rod is limit-connected to the connecting seat.

[0014] Preferably, the thread rotation directions of the two driven screw rods are symmetrically arranged.

[0015] Preferably, both sides of the driven slider are symmetrically connected with connecting slide rods. The end of the connecting slide rod away from the driven slider is connected with a limiting angle block for limiting the installation plate, and the limiting angle block is limit-connected to the connecting seat.

[0016] Preferably, several of the limiting angle blocks are axially symmetrically distributed on the outer side of the installation plate with the core as the axis of symmetry.

[0017] Preferably, the pressing die end includes a connecting column connected to the upper die. The connecting column is slidably penetrated through the workbench.

[0018] In addition, the present invention also provides a combined die forging forming method for necked flanges, including the following steps:

[0019] S1: Drive the upper die and the lower die to be axially aligned through the connecting end, and then place the blank to be processed between the upper die and the lower die to maintain axial correspondence.

[0020] S2: Drive the upper die to move downward through the pressing die end to contact the blank and the lower die, and press down the blank. Through the cooperation among the upper die, the lower die and the core, the blank is gradually deformed into the required shape, and finally the large and small flanges are formed synchronously, realizing the combined die forging forming of large and small sized necked flanges.

[0021] S3: Take out the combined flange after die forging forming, and then cut it at the交接 position of the neck of the large flange and the end of the small flange to obtain two kinds of necked flanges with large and small specifications.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The present invention adopts a combined mold design, and through the coordinated cooperation of the upper mold, the lower mold and the core, the large and small flanges can be formed synchronously in one forging, avoiding multiple processes in traditional steps, thereby directly improving material utilization and production efficiency.

[0024] 2. When the upper die is driven to separate from the lower die after the die forging is completed, the upper die is driven to move in the vertical direction through the connecting column, and the driven gear, the driven screw limiting sleeve and the mounting plate are driven to rotate, so as to drive the positions of the two lower dies arranged above and below the mounting plate to be interchanged, so that the processed flange can be removed from the lower die, and at the same time, the other lower die without a blank is adjusted to correspond to the position of the upper die, so as to carry out the die forging of the next blank, thereby effectively improving the production efficiency of the die forging of the blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the lower mold of the mold of the present invention.

[0028] Figure 3 It is a structural schematic diagram of the mold of the present invention.

[0029] Figure 4 It is a cross-sectional structural diagram of the mold of the present invention.

[0030] Figure 5 It is an exploded view of the mold of the present invention.

[0031] Figure 6 It is a structural schematic diagram of the connection end of the present invention.

[0032] Figure 7 It is a structural schematic diagram of the limiting frame plate of the present invention.

[0033] Figure 8 It is a structural schematic diagram of the limiting sleeve of the present invention.

[0034] Fig. 9 It is a schematic diagram of the ratchet structure of the present invention.

[0035] Fig.10 It is a diagram of large and small combined flanges after die forging of the present invention.

[0036] In the figure, 1. mold; 10. upper mold; 100. groove; 11. lower mold; 110. mounting groove; 111. recessed groove; 12. core; 13. large flange; 14. small flange; 2. workbench; 3. die end; 30. connecting column; 4. connecting end; 40. connecting seat; 41. mounting plate; 42. limiting arc plate; 420. driven slider; 421. driven screw; 43. connecting slide; 430. limiting angle block; 5. driven strip plate; 50. limiting frame plate; 500. rack segment; 51. driven gear; 52. driven rotating rod; 53. limiting sleeve; 54. ratchet. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1 To Attachment Fig.10 Embodiments of the present invention are described in detail.

[0038] The embodiment of the present application discloses a combined die forging device and method for a neck flange, which explains that the present invention is mainly used in the process of die forging a neck flange, and technically realizes the effect of die forging the blank to be processed into a neck flange; and by adopting a combined die design, a structure of a large flange with a small flange is formed by one-time die forging, avoiding multiple processes in traditional steps, thereby directly improving material utilization and production efficiency. The present invention also realizes the effect of removing the die from the blank after die forging and performing the die forging processing of the next blank at the same time through the cooperation between the combined dies, thereby improving the production efficiency of the neck flange.

[0039] Example 1: Reference Figure 1 and Figure 2 As shown, a combined die forging forming device with a neck flange includes a die 1 and a workbench 2 for connecting the die 1. The workbench 2 is provided with a die end 3 and a connecting end 4 correspondingly above and below. The die end 3 is used to provide the punching pressure required for the die-casting blank, and the connecting end 4 is used to connect and limit the required die 1 and blank.

[0040] When in use, the die 1 is connected and limited through the connecting end 4, and then the blank to be processed is placed on the die 1 accordingly, and then the blank is pressed down by the pressing die end 3 for a certain stroke, so that the blank is gradually deformed into the desired shape, thereby achieving the die forging effect of the neck flange.

[0041] Reference Figures 2 to 5 As shown, the mold 1 includes:

[0042] The upper die 10 is connected to the die end 3 and driven to slide in the vertical direction. The upper die 10 protrudes outward, and its protruding section is concave to form a groove 100 that is consistent with the outer edge contour of the small-sized flange after die pressing.

[0043] Lower die 11; connected to the connection end 4, a mounting groove 110 for wrapping the upper die 10 and the blank is recessed in the lower die 11, and the mounting groove 110 is further recessed to form a recess 111 that is the same as the outer edge contour shape of the large-sized flange after die pressing.

[0044] Core 12; coaxially connected to the lower die 11 and slidably passing through the upper die 10, used to maintain the axial correspondence between the upper die 10, the blank, and the lower die 11.

[0045] Refer to Figures 3 to 5 As shown, the size of the core 12 is the same as the inner hole diameter of the small-sized flange.

[0046] Refer to Figure 4 As shown, the blank is a ring blank with a punched hole in the middle. The volume of the ring blank is the total volume of the large and small necked flange forgings. The inner diameter of the ring blank is equal to the inner diameter of the small flange 14, the outer diameter of the ring blank is equal to the outer diameter of the flange end of the large-sized necked flange forging, and the height of the ring blank is calculated according to the principle of constant volume.

[0047] Refer to Figure 6 As shown, that is, the connection end 4 of the die 1 and the blank for connection and limit; specifically, the connection end 4 includes a connection seat 40 and a mounting plate 41. The connection seats 40 are symmetrically arranged on the workbench 2 and are arranged in a U-shaped structure. An installation plate 41 for connecting and limiting the die 1 is commonly connected between all the connection seats 40. The lower die 11 is limited and connected to the mounting plate 41 and is axially corresponding to the die pressing end 3.

[0048] During use, connect the upper die 10 to the die pressing end 3, install the lower die 11 and the core 12 on the mounting plate 41, then horizontally limit the mounting plate 41 on the two connection seats 40, and then place the ring blank to be processed correspondingly between the lower die 11 and the upper die 10. After ensuring the axial correspondence among the upper die 10, the ring blank, the core 12, and the lower die 11, drive the upper die 10 to move downward through the die pressing end 3 to contact the ring blank, and press down the ring blank for a certain stroke to deform the ring blank. Through the cooperation among the upper die 10, the core 12, and the lower die 11, the large and small flanges are formed synchronously at one time, achieving the combined die forging forming effect of the large and small sized necked flanges. Then take out the combined flange after die forging, and cut it at the交接位置 (handover position) between the neck of the large flange 13 and the end of the small flange 14 to obtain two kinds of necked flanges with large and small sizes, effectively reducing material waste.

[0049] Refer to Figure 6As shown, in order to improve the stability of the blank when the upper die 10 and the lower die 11 are used for forging, a plurality of limit arc plates 42 are symmetrically connected to the outer side of the lower die 11, and a driven slider 420 is connected to the side of the limit arc plate 42 away from the lower die 11, and a driven screw rod 421 is threadedly penetrated on the driven slider 420, and the driven screw rod 421 is rotatably penetrated on the connecting seat 40. When in use, after all the driven screw rods 421 are driven to rotate, the driven slider 420 is driven to slide along the connected driven screw rod 421 toward the lower die 11 through the threaded cooperation between the driven screw rod 421 and the driven slider 420, until all the driven sliders 420 drive the connected limit arc plates 42 to contact the lower die 11, thereby realizing the limit tightness of the lower die 11, so as to avoid the displacement of the lower die 11 and the core 12 during die pressing, which leads to the failure of die pressing of the blank.

[0050] It should be noted that the limiting arc plate 42 is pressed against the outer side of the lower mold 11 to achieve a limiting and tightening effect on the lower mold 11. Therefore, the number of the limiting arc plates 42 can be selectively set to multiple. It is only necessary to keep the position correspondence between the lower mold 11 and the upper mold 10. In this embodiment, the limiting arc plate 42, the driven slider 420 and the driven screw 421 are correspondingly set to two.

[0051] Reference Figure 6 As shown, in order to facilitate driving all the driven sliders 420 and the limit arc plates 42 to slide synchronously along the connected driven screws 421, the upper thread rotation directions of the two driven screws 421 are symmetrically arranged. When in use, the synchronization is to drive the two driven screws 421 to rotate in the forward direction. The two driven screws 421 rotate, driving the two driven sliders 420 to slide along the driven screws 421 in the direction of approaching each other, until the connected limit arc plates 42 are driven to contact the lower mold 11. When the limit of the lower mold 11 needs to be released, it is only necessary to synchronously drive the two driven screws 421 to rotate in the opposite direction, so that the two driven sliders 420 and the limit arc plates 42 slide in the direction of moving away from each other and disengage from the lower mold 11.

[0052] Reference Figures 6 to 8 As shown, in order to prevent the driven slider 420 from rotating when the driven screw rod 421 rotates, connecting slide rods 43 are symmetrically connected on both sides of the driven slider 420, and the end of the connecting slide rod 43 away from the driven slider 420 is connected to a limiting angle block 430 for limiting the mounting plate 41. The limiting angle block 430 is slidably inserted on the connecting seat 40, and a sliding groove is formed on the connecting seat 40 for the limiting angle block 430 to slide.

[0053] When in use, after the driven screw 421 rotates, the driven slider 420 slides along the driven screw 421 while driving the connecting slider 43 and the limit angle block 430 connected on both sides to slide. At this time, the limit angle block 430 is limited by the connecting seat 40, and the limit angle block 430 limits the connecting slider 43 and the driven slider 420 to limit the driven slider 420 from being driven by the driven screw 421 to rotate, thereby driving the driven slider 420 to slide axially through the threaded cooperation between the driven screw 421 and the driven slider 420.

[0054] Reference Figures 6 to 8 As shown, a plurality of limiting angle blocks 430 are symmetrically distributed on the outer side of the mounting plate 41 with the core 12 as the axis. When in use, the driven screw 421 is rotated to drive the plurality of limiting angle blocks 430 to slide synchronously toward the mounting plate 41. After all the limiting angle blocks 430 are in contact with the mounting plate 41, the limiting angle blocks 430 limit the sliding of the mounting plate 41 on the connecting seat 40, so as to maintain the corresponding position effect of the lower mold 11 of the mounting plate 41, the core 12 and the upper mold 10.

[0055] Reference Figure 7 As shown, the die end 3 is used to provide the pressure required for the forging of the billet; specifically, the die end 3 includes a connecting column 30 connected to the upper die 10, the connecting column 30 is slidably penetrated on the workbench 2, and the connecting column 30 is driven by a hydraulic cylinder, and the hydraulic cylinder is installed at the upper end of the workbench 2.

[0056] When in use, the telescopic section of the hydraulic cylinder drives the connecting column 30 and the upper die 10 to slide in the vertical direction to provide downward pressure for pressing the blank. After the connecting column 30 and the lower die 11 move down and contact the blank, the blank is pressed for a certain stroke. Through the cooperation between the upper die 10, the lower die 11 and the core 12, the blank is gradually deformed into the desired shape. Finally, the large and small flanges are formed synchronously, realizing the combined die forging of large and small specifications of neck flanges.

[0057] Example 2: Reference Figures 6 to 8As shown, on the basis of the first embodiment, in order to improve the die forging forming efficiency of the necked flange, the core 12 penetrates through the lower die 11 and the mounting plate 41, and another lower die 11 is coaxially connected to a section of the core 12 that penetrates through the mounting plate 41. The two lower dies 11 are symmetrically distributed on both sides of the mounting plate 41. The two connecting seats 40 on the workbench 2 are symmetrically and spaced apart on both sides of the die 1 and the mounting plate 41, and at the same time, several limiting angle blocks 430 partially slide out of the sliding grooves on the connecting seats 40 to support and limit the mounting plate 41. At this time, as an optional implementation manner, the relative sides of the lower portions of the two limiting angle blocks 430 on the same connecting seat 40 can be directly connected to increase the supporting effect on the mounting plate 41, and the relative sides of the limiting angle blocks 430 on the two connecting seats 40 are symmetrically arranged as slope structures (not shown in the figure), and the corresponding sides of the mounting plate 41 corresponding to the limiting angle blocks 430 are also correspondingly arranged as slopes (not shown in the figure).

[0058] During use, by driving the two driven screws 421 to rotate in opposite directions, the driven sliders 420, the limiting arc plates 42, the connecting sliding rods 43, and the limiting angle blocks 430 are driven to slide in a direction away from the lower die 11 until the driven sliders 420, the limiting arc plates 42, the connecting sliding rods 43, and the limiting angle blocks 430 are separated from the contact with the mounting plate 41 and the lower die 11. Then, the pressure connecting column 30 and the upper die 10 are driven to move upward, and then the mounting plate 41, the core 12, and the two lower dies 11 are driven to rotate, so that the positions of the two lower dies 11 on both sides of the mounting plate 41 are interchanged, that is, one of the lower dies 11 for die forging the flange rotates downward, and the other lower die 11 without placing the flange blank rotates upward, so as to facilitate the removal of the processed flange while processing the next blank. Then, the two driven screws 421 are driven to rotate forward, and the driven sliders 420, the limiting arc plates 42, the connecting sliding rods 43, and the limiting angle blocks 430 are reset to re-limit the mounting plate 41 and the lower die 11.

[0059] Further, referring to Figure 7 As shown, a driven strip plate 5 is connected to the connecting column 30, and a limiting frame plate 50 arranged in a U-shaped structure is connected to the driven strip plate 5. A rack section 500 is formed downward in the middle of the vertical section of the limiting frame plate 50, and a driven gear 51 is engaged with the rack section 500. A driven rotating rod 52 passes through the driven gear 51, and the driven rotating rod 52 is installed on the workbench 2 through a connecting plate. The two ends of the driven rotating rod 52 and the two driving screws are connected by a synchronous belt drive.

[0060] When the hydraulic cylinder drives the connecting column 30 and the upper mold 10 to slide in the vertical direction, the connecting column 30 drives the driven strip plate 5 and the limit frame plate 50 to slide, and after the rack segment 500 on the limit frame plate 50 contacts and meshes with the driven gear 51, it drives the driven rotating rod 52 to rotate, and drives the two driven screw rods 421 to rotate through the synchronous belt. Synchronous belt transmission is a conventional existing technical means and will not be described here.

[0061] Reference Figures 7 to 9 As shown, in order to maintain the state that the mounting plate 41 and the two lower molds 11 are driven to rotate only when the connecting column 30 drives the upper mold 10 to move upward, a limiting sleeve 53 connected to the mounting plate 41 is symmetrically rotatably sleeved on the two driven screws 421, and an inner ratchet is arranged on the limiting sleeve 53. A pawl 54 is arranged on the driven screw 421 corresponding to the inner ratchet. The pawl 54 and the driven screw 421 are connected by a torsion spring (not shown in the figure), and the connected pawl 54 is driven by the torsion spring (not shown in the figure) to have a driving force always approaching the inner ratchet.

[0062] The driven gear 51 rotates to drive the driven rotating rod 52 and the two driven screws 421 to rotate in the opposite direction, thereby driving the driven slider 420, the limiting arc block, the connecting slide bar 43 and the limiting angle block 430 to reset and limit the lower mold 11 and the mounting plate 41. At this time, the driven screw 421 rotates to drive the connected pawl 54 to rotate in the opposite direction, driving the torsion spring (not shown in the figure) between the pawl 54 and the driven screw 421 to be compressed and then slide through the ratchet teeth of the inner ratchet wheel on the limiting sleeve 53, thereby not driving the limiting sleeve 53 to rotate, so that when the connecting column 30 drives the upper mold 10 to move downward, the mounting plate 41 and the two lower molds 11 remain stationary.

[0063] When the connecting column 30 drives the lower mold 11, the driven strip plate 5 and the limiting frame plate 50 to move upward, before the rack segment 500 on the limiting frame plate 50 moves upward and contacts with the driven gear 51, the driven gear 51 will not drive the driven screw 421 to rotate. After the rack segment 500 contacts and engages with the driven gear 51, the driven gear 51 drives the driven rotating rod 52 and the two driven screws 421 to rotate forward, and the limiting arc plates 42 and the limiting angle blocks 430 on both sides of the mounting plate 41 are away from and detached from the mounting plate 41 to avoid obstruction to the rotation of the mounting plate 41 and the lower mold 11.

[0064] At the same time, after the driven screw 421 rotates forward, it also synchronously drives the connected pawl 54 to rotate forward. Since the inner ratchet on the limiting sleeve 53 limits the pawl 54, the driven screw 421 rotates forward synchronously to drive the pawl 54, the limiting sleeve 53, the mounting plate 41 and the two lower dies 11 to rotate, thereby completing the effect of interchangeably adjusting the position of the lower dies 11, so that the processed flange can be removed from the lower die 11, and at the same time, the other lower die 11 without a blank placed is adjusted to the position corresponding to the upper die 10, so as to carry out the die forging process of the next blank, thereby effectively improving the production efficiency of the blank die forging process.

[0065] It should be noted that the positive rotation of the driven rotating rod 52 and the driven screw 421 driven by the driven gear 51 is relative to the reverse rotation of the inner ratchet on the limiting sleeve 53, and vice versa.

[0066] Embodiment 3: The present invention also provides a neck flange combined die forging forming method, using the above-mentioned neck flange combined die forging forming device, the forming method comprises the following steps:

[0067] S1: The upper die 10 and the lower die 11 are driven to align axially through the connection end 4, and then the blank to be processed is placed between the upper die 10 and the lower die 11 to keep axial correspondence.

[0068] S2: The upper die 10 is driven downward by the die end 3 to contact the blank and the lower die 11, and the blank is pressed downward. Through the cooperation among the upper die 10, the lower die 11 and the core 12, the blank is gradually deformed into the desired shape. Finally, the large and small flanges are formed synchronously, realizing the combined die forging of large and small specifications of neck flanges.

[0069] S3: The combined flange formed by die forging is taken out, and then cut at the intersection of the neck of the large flange 13 and the end of the small flange 14 to obtain two types of neck flanges with large and small specifications.

[0070] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

[0071] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A combined die forging device with a neck flange, comprising a die (1) and a workbench (2) for connecting the die (1), characterized in that: The described workbench (2) is provided with a die pressing end (3) and a connecting end (4) corresponding to each other up and down. The die pressing end (3) is used to provide the pressure required for die forging, and the connecting end (4) is used to connect and position the required die (1) and blank. Among them: The described die (1) includes: An upper die (10); connected to the die pressing end (3) and driven by it to slide in the vertical direction. The upper die (10) protrudes outward, and a groove (100) is formed in the concave end of the protrusion, and the groove (100) has the same contour shape as the outer edge of the small-sized flange after die pressing; A lower die (11); connected to the connecting end (4). An installation groove (110) for covering the upper die (10) and the blank is formed in the lower die (11) by concave inward, and the installation groove (110) further recesses to form a recessed groove (111) with the same contour shape as the outer edge of the large-sized flange after die forming; A core (12); coaxially connected to the lower die (11) and slidably passing through the upper die (10), used to maintain the axial correspondence among the upper die (10), the blank and the lower die (11).

2. The combined die forging device with a neck flange according to claim 1, characterized in that: The size of the described core (12) is the same as the inner hole diameter of the small-sized flange.

3. The combined die forging device with a neck flange according to claim 1, characterized in that: The blank is a ring blank with a middle punch hole. The volume of the ring blank is the total volume of the large and small necked flange forgings. The inner diameter of the ring blank is equal to the inner diameter of the small flange, and the outer diameter of the ring blank is equal to the outer diameter of the flange end of the large-sized necked flange forging.

4. The combined die forging device with neck flange according to claim 1, characterized in that: The described connecting end (4) includes connecting seats (40) symmetrically arranged on the workbench (2) and having a U-shaped structure. An installation plate (41) for connecting and positioning the die (1) is commonly connected between all the connecting seats (40). The lower die (11) is limit-connected to the installation plate (41) and is axially corresponding to the die pressing end (3).

5. The combined die forging device for a neck flange according to claim 4, characterized in that: Limit arc plates (42) are symmetrically connected to the outside of the lower die (11). A driven slider (420) is connected to the side of the limit arc plate (42) away from the lower die (11). A driven screw (421) is threadedly passed through the driven slider (420), and the driven screw (421) is limit-connected to the connecting seat (40).

6. The combined die forging device for a neck flange according to claim 5, characterized in that: The thread rotation directions of the two driven screws (421) are symmetrically arranged.

7. The combined die forging device for a neck flange according to claim 5, characterized in that: Connecting slide bars (43) are symmetrically connected to both sides of the driven slider (420). A limit angle block (430) for limiting the installation plate (41) is connected to the end of the connecting slide bar (43) away from the driven slider (420), and the limit angle block (430) is limit-connected to the connecting seat (40).

8. The combined die forging device for a neck flange according to claim 7, characterized in that: A plurality of the limit angle blocks (430) are axially symmetrically distributed outside the installation plate (41) with the core (12) as the axis of symmetry.

9. The combined die forging device with neck flange according to claim 1, characterized in that: The described die pressing end (3) includes a connecting column (30) connected to the upper die (10), and the connecting column (30) slidably passes through the workbench (2).

10. A combined die forging method for a neck flange, using a combined die forging device for a neck flange as claimed in any one of claims 1 to 9, characterized in that: The forming method includes the following steps: S1: Drive the upper die (10) and the lower die (11) to be axially aligned through the connecting end (4), and then place the blank to be processed between the upper die (10) and the lower die (11) to maintain axial correspondence; S2: The upper die (10) is driven downward by the die end (3) to contact the blank and the lower die (11), and the blank is pressed downward. Through the cooperation between the upper die (10), the lower die (11) and the core (12), the blank is gradually deformed into a desired shape, and finally the large and small flanges are formed synchronously, thereby realizing the combined die forging of large and small specifications of neck flanges; S3: The combined flange formed by die forging is taken out, and then cut at the intersection of the neck of the large flange (13) and the end of the small flange (14), so as to obtain two types of neck flanges with large and small specifications.

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