Closed die for flange forging and forging method thereof

Abstract

The invention relates to a closed die for flange forging and a forging method thereof, and belongs to the technical field of forging dies, the closed die comprises a forging head, an upper die and a lower die, the lower die is vertically arranged, the upper die and the lower die are detachably connected, the forging head is slidably connected with the upper die, and the forging head slides in the direction close to or away from the lower die. A containing groove is formed in the side, facing the upper die, of the lower die, a bottom plate is arranged at the bottom of the containing groove, two clamping plates are slidably connected to the bottom plate, the two clamping plates are arranged in an axial symmetry mode along the center axis of the bottom plate, and the two clamping plates move in the direction close to or away from each other. And meanwhile, the loss and waste of materials can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of forging dies, and particularly to a closed die for flange forging and a forging method thereof. Background Art

[0002] A flange is a part that connects pipes to each other and valves, and is connected to the pipe end; there are also flanges used at the inlets and outlets of equipment, which are parts for connecting two equipment; it is a part that connects pipes to each other; connected to the pipe end, it is an accessory product of the pipeline; the main materials of forged flanges are carbon steel, alloy steel, and stainless steel; the main standards are national standards, electrical standards, American standards, German standards, Japanese standards, etc.; the main anti-corrosion treatments are oil coating and plating; forged flanges have good pressure resistance and temperature resistance, and are generally applicable to high-pressure and high-temperature working environments.

[0003] The production processes are mainly divided into forging and casting. Generally, forged flanges contain less carbon and are not easy to rust compared with cast flanges, and their mechanical properties are superior to those of cast flanges. Forged parts can withstand higher shear and tensile forces than castings. The forging process generally consists of selecting high-quality steel billets for blanking, heating, forming, and post-forging cooling processes. The forging processes include open die forging, die forging, and semi-closed die forging. During production, different forging methods are selected according to the mass of the forgings and the production batch size.

[0004] In the field of flange forging, traditional open dies are widely used because of their simple structure and low manufacturing cost. However, with the improvement of the quality and performance requirements for flange products, during the forging process of such dies, due to the openness of the dies, it is easy to cause material loss and waste, and at the same time, it is difficult to guarantee the forging accuracy. Summary of the Invention

[0005] In order to improve the forging accuracy of flanges and at the same time reduce material loss and waste, the present application provides a closed die for flange forging and a forging method thereof.

[0006] In a first aspect, the present application provides a closed die for flange forging, adopting the following technical solution: A closed die for flange forging includes a forging head, and further includes an upper die and a lower die. The lower die is vertically arranged, the upper die and the lower die are detachably connected, the forging head is slidably connected to the upper die, and the sliding direction of the forging head is along the direction of approaching or departing from the lower die. An accommodation groove is formed on the side of the lower die facing the upper die. A bottom plate is arranged at the bottom of the accommodation groove. The bottom plate includes an inner rotating plate and an outer ring plate. The inner rotating plate and the outer ring plate are inserted and connected. The outer ring plate is fixed to the lower die, and the inner rotating plate rotates relative to the lower die. The rotation axis direction of the inner template is along the vertical direction. Two clamping plates are slidably connected to the bottom plate. The two clamping plates are axially symmetrically arranged along the central axis of the bottom plate, and the two clamping plates move in the direction of approaching or departing from each other. A driving component for driving the two clamping plates to slide is arranged in the lower die.

[0007] By adopting the above technical solution, the lower die is first fixed on the workbench, and then the forging module is placed in the receiving groove of the lower die, the two clamps are driven to clamp the forging module, and then the upper die and the lower die are fixed, and the forging head is started to start forging the forging module. At the same time, the inner rotating plate is rotated. The rotation of the inner rotating plate drives the forging module to rotate at the same time, which facilitates the uniformity and regularity of the forging module. In addition, placing the forging module in the receiving groove of the lower die for forging can reduce material loss and improve the forging accuracy.

[0008] Optionally, the driving assembly includes a bidirectional screw and a guide rod, the bidirectional screw rotates relative to the lower mold, and the rotation axis of the bidirectional screw is in the horizontal direction, the guide rod is arranged parallel to the bidirectional screw, and the two clamps are axially symmetrically arranged along the center line of the bidirectional screw and are threadedly connected to the bidirectional screw, and the clamps are slidably connected to the guide rod.

[0009] By adopting the above technical solution, the two clamps are axially symmetrically arranged relative to the bidirectional screw, so when the bidirectional screw rotates, the two clamps move in the direction of approaching or moving away from each other under the drive of the thread of the bidirectional screw and the guidance of the guide rod.

[0010] Optionally, a connecting block is provided at one end of the splint close to the bidirectional screw, the connecting block is detachably connected to the splint, a connecting assembly for quick connection between the splint and the connecting block is provided between the splint and the connecting block, a toggle rod for releasing the splint and the connecting block is provided on the bidirectional screw, a first spring rod is fixed in the accommodating groove of the lower mold, and the movable end of the first spring rod is fixed to the splint.

[0011] By adopting the above technical solution, when the splint moves to the position of the toggle rod, it can be unlocked from the connecting block, that is, the splint and the connecting block are separated. At this time, only the spring rod supports the splint to change with the shape of the forging module. This not only reduces the pulling force on the bidirectional screw, but also makes the movement of the splint more flexible without restricting the shape of the forging module.

[0012] Optionally, the connecting assembly includes a limit block, a spring and a return rod, the limit block is fixed to the connecting block, a limit slot is provided in the connecting block, the spring is fixed in the limit slot, the limit block is fixed to the spring, a slot is provided on the splint, the limit block is limited in the slot, the return rod passes through the connecting block and is fixed to the limit block, and the return rod moves in a direction close to or away from the splint.

[0013] By adopting the above technical solution, at the beginning, the limit block and the slot are limited, and the splint and the connecting block are connected together. When the splint moves to a position close to the toggle rod, the toggle rod drives the return rod away from the splint, so that the limit of the limit block and the slot can be released. At this time, the splint is only supported by the first spring rod, and it will be more flexible to follow the shape changes of the forging module, and the pulling damage to the bidirectional screw will also be smaller.

[0014] Optionally, a transfer block is provided on the bidirectional screw, the transfer block is fixed to the lower mold, the transfer block is fixed to the toggle rod, and the side of the toggle rod close to the return rod is set as a bevel surface. When the return rod abuts against the toggle rod, the return rod moves toward the side away from the splint.

[0015] By adopting the above technical solution and utilizing the beveled surface of the toggle block itself, when the splint and the connecting block are close to the adapter block, the return lever automatically abuts against the toggle lever and slides along the beveled surface of the toggle lever at the same time. At this time, the limiting connection between the limit block and the slot can be achieved, thereby separating the splint and the connecting block.

[0016] Optionally, a lifting column is provided at the bottom of the inner rotating plate, and the lifting column includes a threaded sleeve, a threaded rod and a support rod. The threaded sleeve is fixed to the lower mold, and the threaded rod rotates relative to the threaded sleeve. The rotation axis direction of the threaded rod is along the vertical direction, the threaded rod is fixed to the support rod, and the support rod is threadedly connected to the threaded rod. A rotating motor is fixed at one end of the support rod away from the threaded rod, and the motor shaft of the rotating motor is fixed to the inner rotating plate.

[0017] By adopting the above technical solution, the lifting column can lift up the inner rotating plate when the lower die is demoulded, thereby facilitating the removal of the forging module.

[0018] Optionally, a plurality of second spring rods are fixed to the bottom of the outer ring plate, and the plurality of second spring rods are distributed at intervals along the circumference of the outer ring plate. When the forging module is forging, the second spring rods are in a compressed state.

[0019] By adopting the above technical solution, the second spring rod can provide support for the bottom plate when the forging module is forged, thereby reducing the supporting pressure of the lifting column and helping to increase the service life of the lifting column.

[0020] Optionally, a plurality of plug posts are fixed at intervals at one side edge of the upper mold facing the lower mold, and a plurality of slots are provided at the edge of the lower mold receiving groove, and the plug posts are inserted and connected with the slots.

[0021] By adopting the above technical solution, the pin is inserted into the slot, which is beneficial to maintaining the stability of the upper mold and the lower mold.

[0022] Optionally, the clamping plate itself is configured to be arc-shaped, and two arcs protrude toward sides away from each other.

[0023] By adopting the above technical solution, the arc shape of the clamping plate is easy to fit the shape of the forged flange, so as to improve the forging accuracy of the forging module.

[0024] In a second aspect, the present application provides a forging method of a closed die for flange forging, which adopts the following technical solution: A forging method of a closed die for flange forging, comprising the following steps: S1. First, place the lower die on the workbench and fix it, then place the forging module in the receiving groove of the lower die; S2, driving the two clamping plates to move toward the forging module until the forging module is clamped; S3, fixing the upper die and the lower die, and starting the forging head to forge the forging module; S4, when the clamping plate moves to the vicinity of the transfer block, the toggle rod abuts against the return rod, and the lock between the connection block and the clamping plate can be released. The rotating motor drives the inner rotating plate to rotate, thereby driving the forging module to rotate together. At this time, the clamping plate changes with the change of the shape of the forging module under the support of the first spring rod; S5. When demolding, first remove the upper die, drive the lifting column at the bottom of the inner rotating plate to lift up the inner rotating plate, so that the forging module can be taken out.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. When the forging head forges the forging module, the two clamping plates clamp the forging module, and the inner rotating plate drives the forging module to rotate, so as to improve the forging accuracy of the forging module; 2. The lifting column at the bottom of the inner rotating plate rises after forging is completed, which helps to demould the forging module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a schematic cross-sectional structure diagram of an embodiment of the present application; Figure 3 It is a schematic diagram showing the structure of the splint and the drive assembly; Figure 4 This is a schematic diagram showing the cross-sectional structure of the connecting block and the splint.

[0027] Explanation of the accompanying drawings: 1. forging head; 2. upper die; 21. plug column; 22. cover shell; 3. lower die; 31. slot; 32. accommodating slot; 4. bottom plate; 41. inner rotating plate; 411. lifting column; 4111. threaded sleeve; 4112. threaded rod; 4113. support rod; 4114. second motor; 412. rotating motor; 42. outer ring plate; 421. second spring rod; 5. clamping plate; 51. first spring rod; 52. connecting block; 521. connecting assembly; 5211. limit block; 5212. spring; 5213. return rod; 522. limit slot; 6. driving assembly; 61. bidirectional screw; 611. adapter block; 612. toggle rod; 62. guide rod; 63. first motor; 7. sliding assembly; 71. limit cover; 711. sliding hole; 72. sliding rod; 73. third motor. DETAILED DESCRIPTION

[0028] The following is combined withFigures 1-4 Further details of this application will be described below.

[0029] An embodiment of this application discloses a closed die for flange forging.

[0030] Refer to Figure 1 , a closed die for flange forging, including a forging head 1, and further including an upper die 2 and a lower die 3. The lower die 3 is vertically arranged. A plurality of plug posts 21 are fixedly spaced at the edge of the side of the upper die 2 facing the lower die 3. A plurality of slots 31 are fixed at the corresponding edge of the lower die 3. When the upper die 2 and the lower die 3 are installed, first fix the lower die 3 on the workbench. The lower die 3 is provided with a receiving groove 32. Place the forging module in the receiving groove 32, and then install the upper die 2 and the lower die 3. At this time, the plug posts 21 are correspondingly inserted into the slots 31, and ear plates are provided on the sides of both the upper die 2 and the lower die 3, and the ear plates on the same side are fixedly connected by bolts.

[0031] Refer to Figure 2 , the forging head 1 is slidably connected to the upper die 2. A housing 22 is fixed on the upper die 2. A sliding component 7 is arranged in the housing 22. The sliding component 7 includes a limiting cover 71, a sliding rod 72, and a third motor 73. The third motor 73 is fixed at the bottom of the housing 22 and is fixed to the limiting cover 71. The forging head 1 slides relative to the limiting cover 71. A spiral sliding hole 711 is provided on the side wall of the limiting cover 71. The forging head 1 is fixed to the sliding rod 72. A vertical sliding groove is provided on the side wall of the housing 22. The sliding rod 72 passes through the sliding hole 711 and slides along the length of the sliding groove. When the third motor 73 is started, it drives the limiting cover 71 to rotate. The sliding rod 72 on the forging head 1 is simultaneously limited by the sliding hole 711 and the sliding groove, and drives the forging head 1 to move in a direction close to or away from the lower die 3.

[0032] Refer to Figure 2 and Figure 3 , a bottom plate 4 is arranged at the bottom of the receiving groove 32. The bottom plate 4 includes an inner rotating plate 41 and an outer ring plate 42. The inner rotating plate 41 and the outer ring plate 42 are inserted and connected. The outer ring plate 42 is fixed to the lower die 3. The inner rotating plate 41 rotates relative to the lower die 3. The rotation axis direction of the inner template is along the vertical direction. A lifting column 411 is arranged at the bottom of the inner rotating plate 41. The lifting column 411 includes a threaded sleeve 4111, a threaded rod 4112, a support rod 4113, and a second motor 4114. The threaded sleeve 4111 is fixed to the lower die 3. The second motor 4114 is fixed at the bottom of the threaded sleeve 4111 and the motor shaft of the second motor 4114 is fixedly connected to the threaded rod 4112. The rotation axis direction of the threaded rod 4112 is along the vertical direction. The threaded rod 4112 is fixed to the support rod 4113. The support rod 4113 is threadedly connected to the threaded rod 4112. A rotating motor 412 is fixed at the end of the support rod 4113 away from the threaded rod 4112. The motor shaft of the rotating motor 412 is fixed to the inner rotating plate 41.

[0033] A plurality of second spring rods 421 are fixedly arranged at the bottom of the outer ring plate 42. The plurality of second spring rods 421 are circumferentially spaced apart along the outer ring plate 42. When the forging module is forging, the second spring rods 421 are in a compressed state. In this way, the supporting force of the second spring rods 421 on the bottom plate 4 can decompose the pressure of the lifting column 411, thereby increasing the service life of the lifting column 411.

[0034] Reference Figure 2 、 Figure 3 and Figure 4 , two clamping plates 5 are slidably connected to the bottom plate 4. Both of the two clamping plates 5 are provided with arcs, and the arcs protrude toward the sides away from each other. The two clamping plates 5 are symmetrically arranged along the central axis of the bottom plate 4, and the two clamping plates 5 move in the direction of approaching or separating from each other.

[0035] A driving assembly 6 is arranged in the lower die 3. The driving assembly 6 includes a bidirectional screw 61, a guide rod 62 and a first motor 63. The first motor 63 is fixedly arranged on the inner wall of the receiving groove 32 of the lower die 3. The bidirectional screw 61 is horizontally arranged and fixed to the motor shaft of the first motor 63. The bidirectional screw 61 rotates relative to the lower die 3, and the rotation axis direction of the bidirectional screw 61 is along the horizontal direction. The guide rod 62 is arranged parallel to the bidirectional screw 61 and fixed to the inner wall of the lower die 3. The two clamping plates 5 are respectively threadedly connected to the bidirectional screw 61, and the clamping plates 5 are slidably connected to the guide rod 62.

[0036] A connecting block 52 is provided at one end of the splint 5 close to the bidirectional screw 61, and the connecting block 52 is detachably connected to the splint 5, and a first spring rod 51 is horizontally fixed in the accommodating groove 32 of the lower mold 3, and the movable end of the first spring rod 51 is fixed to the splint 5; a connecting assembly 521 is provided between the splint 5 and the connecting block 52, and the connecting assembly 521 includes a limit block 5211, a spring 5212 and a return lever 5213, the limit block 5211 is fixed to the connecting block 52, a limit groove 522 is horizontally provided in the connecting block 52, the spring 5212 is fixed in the limit groove 522, the limit block 5211 is fixed to the spring 5212, and a side of the limit block 5211 facing the first spring rod 51 is set to an oblique surface, a clamping groove is provided on the splint 5, the limit block 5211 is limited in the clamping groove, and the return lever 5213 passes through the connecting block 52 and the limit block 5 211 is fixed; the bidirectional screw 61 is provided with an adapter block 611, the adapter block 611 is fixed to the side wall of the lower mold 3, the adapter block 611 is fixed to the toggle rod 612, and the toggle rod 612 is close to the side of the return rod 5213 and is set to a bevel surface. When the connecting block 52 abuts against the adapter block 611, the return rod 5213 abuts against the toggle rod 612. At this time, the return rod 5213 gradually slides along the bevel surface of the toggle rod 612, and the return rod 5213 moves toward the side away from the clamping plate 5. At this time, the limit block 5211 is released from the slot, that is, the clamping plate 5 and the connecting block 52 are disengaged. At this time, the forging module is clamped by the clamping plate 5, and the inner rotating plate 41 rotates at the same time, which can not only better fit the shape change of the forging module and improve the forging accuracy, but also reduce the pulling force of the bidirectional screw 61 and increase the service life of the bidirectional screw 61.

[0037] The implementation principle of a closed die for flange forging in an embodiment of the present application is as follows: first fix the lower die 3 on the workbench, then place the forging module on the bottom plate 4 of the accommodating groove 32, drive the two clamps 5 to clamp the forging module, and at this time, the toggle rod 612 drives the return lever 5213 to move until the limit of the limit block 5211 and the slot is released, that is, the connecting block 52 is separated from the clamp 5, and then the upper die 2 and the lower die 3 are installed together, drive the forging head 1 to process the forging module, and at the same time drive the inner rotating plate 41 to rotate, so as to increase the forging accuracy of the forging module and reduce material waste.

[0038] The embodiment of the present application also discloses a forging method of a closed die for flange forging.

[0039] The following steps are involved: S1. First, place the lower die 3 on the workbench and fix it, and then place the forging module in the receiving groove 32 of the lower die 3; S2, driving the two clamping plates 5 to move toward the forging module until the forging module is clamped; S3, fixing the upper die 2 and the lower die 3, and starting the forging head 1 to forge the forging module; S4. When the clamping plate 5 moves near the adapter block 611, the toggle lever 612 abuts against the return lever 5213, and the locking of the connecting block 52 and the clamping plate 5 can be released. The rotating motor 412 drives the inner rotating plate 41 to rotate, thereby driving the forging module to rotate together. At this time, the clamping plate 5 changes following the change in the shape of the forging module under the support of the first spring rod 51; S5. During demolding, first remove the upper mold 2, and drive the lifting column 411 at the bottom of the inner rotating plate 41 to lift the inner rotating plate 41, so that the forging module can be taken out.

[0040] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A closed die for flange forging, comprising a forging head (1), characterized in that: It further includes an upper die (2) and a lower die (3). The lower die (3) is vertically arranged, and the upper die (2) and the lower die (3) are detachably connected. The forging head (1) is slidably connected to the upper die (2), and the sliding direction of the forging head (1) is along the direction of approaching or departing from the lower die (3). On the side of the lower die (3) facing the upper die (2), a receiving groove (32) is provided. At the bottom of the receiving groove (32), a bottom plate (4) is arranged. The bottom plate (4) includes an inner rotating plate (41) and an outer ring plate (42). The inner rotating plate (41) and the outer ring plate (42) are inserted and connected. The outer ring plate (42) is fixed to the lower die (3), and the inner rotating plate (41) rotates relative to the lower die (3). The direction of the rotation axis of the inner template is along the vertical direction. Two clamping plates (5) are slidably connected to the bottom plate (4). The two clamping plates (5) are arranged axially symmetrically along the central axis of the bottom plate (4), and the two clamping plates (5) move in the direction of approaching or departing from each other. A driving component (6) for driving the two clamping plates (5) to slide is arranged in the lower die (3).

2. The closed die for flange forging according to claim 1, characterized in that: The driving component (6) includes a bidirectional screw (61) and a guide rod (62). The bidirectional screw (61) rotates relative to the lower die (3), and the direction of the rotation axis of the bidirectional screw (61) is along the horizontal direction. The guide rod (62) is arranged parallel to the bidirectional screw (61). The two clamping plates (5) are arranged axially symmetrically along the center line of the bidirectional screw (61) and are threadedly connected to the bidirectional screw (61). The clamping plates (5) are slidably connected to the guide rod (62).

3. The closed die for flange forging according to claim 2, wherein: At one end of the clamping plate (5) close to the bidirectional screw (61), a connecting block (52) is arranged. The connecting block (52) is detachably connected to the clamping plate (5). A connecting component (521) for quickly connecting the two is arranged between the clamping plate (5) and the connecting block (52). A toggle rod (612) for releasing the connection between the clamping plate (5) and the connecting block (52) is arranged on the bidirectional screw (61). A first spring rod (51) is fixed in the receiving groove (32) of the lower die (3), and the movable end of the first spring rod (51) is fixed to the clamping plate (5).

4. A closed die for flange forging according to claim 3, characterized in that: The connecting component (521) includes a limiting block (5211), a spring (5212) and a return rod (5213). The limiting block (5211) is fixed to the connecting block (52). A limiting groove (522) is formed in the connecting block (52). The spring (5212) is fixed in the limiting groove (522). The limiting block (5211) is fixed to the spring (5212). A clamping groove is formed in the clamping plate (5). The limiting block (5211) is limited in the clamping groove. The return rod (5213) penetrates through the connecting block (52) and is fixed to the limiting block (5211). The return rod (5213) moves in the direction of approaching or departing from the clamping plate (5).

5. The closed die for flange forging according to claim 4, characterized in that: A transfer block (611) is arranged on the bidirectional screw (61). The transfer block (611) is fixed to the lower die (3). The transfer block (611) is fixed to the toggle rod (612). One side of the toggle rod (612) close to the return rod (5213) is set as an inclined plane. When the return rod (5213) abuts against the toggle rod (612), the return rod (5213) moves towards the side away from the clamping plate (5).

6. A closed die for flange forging according to claim 1, characterized in that: A lifting column (411) is arranged at the bottom of the inner rotating plate (41), and the lifting column (411) comprises a threaded sleeve (4111), a threaded rod (4112) and a support rod (4113); the threaded sleeve (4111) is fixed to the lower mold (3); the threaded rod (4112) rotates relative to the threaded sleeve (4111); the rotation axis direction of the threaded rod (4112) is along the vertical direction; the threaded rod (4112) is fixed to the support rod (4113); the support rod (4113) is threadedly connected to the threaded rod (4112); a rotating motor (412) is fixed to one end of the support rod (4113) away from the threaded rod (4112); and the motor shaft of the rotating motor (412) is fixed to the inner rotating plate (41).

7. The closed die for flange forging according to claim 6, characterized in that: A plurality of second spring rods (421) are fixed to the bottom of the outer ring plate (42), and the plurality of second spring rods (421) are distributed at intervals along the circumference of the outer ring plate (42). When the forging module is forged, the second spring rods (421) are in a compressed state.

8. A closed die for flange forging according to claim 1, characterized in that: A plurality of plugging posts (21) are fixed at intervals on one side edge of the upper die (2) facing the lower die (3); a plurality of slots (31) are provided on the edge of the slot opening of the receiving slot (32) of the lower die (3); and the plugging posts (21) are plugged and connected with the slots (31).

9. The closed die for flange forging according to claim 1, wherein: The clamping plate (5) itself is arranged in an arc shape, and two arcs protrude towards sides facing away from each other.

10. A forging method for a closed die used in flange forging, characterized in that: The following steps are involved: S1. First, place the lower die (3) on a workbench and fix it, and then place the forging module in the receiving groove (32) of the lower die (3); S2, driving the two clamping plates (5) to move toward the forging module until the forging module is clamped; S3, fixing the upper die (2) and the lower die (3), and starting the forging head (1) to forge the forging module; S4, when the clamping plate (5) moves to the vicinity of the transfer block (611), the toggle rod (612) abuts against the return rod (5213), thereby releasing the lock between the connection block (52) and the clamping plate (5), and the rotating motor (412) drives the inner rotating plate (41) to rotate, thereby driving the forging module to rotate together. At this time, the clamping plate (5) changes with the change of the shape of the forging module under the support of the first spring rod (51); S5. When demolding, first remove the upper mold (2), drive the lifting column (411) at the bottom of the inner rotating plate (41) to lift up the inner rotating plate (41), so that the forging module can be taken out.

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