A vertical double-spindle rotary forging machine

Abstract

A vertical twin-spindle rotary forging machine includes a vertical bed, a forging unit, a feeding mechanism, and a core-pulling mechanism. The forging unit is connected to the middle of the vertical bed, and a front cover is provided above the forging unit, which is connected to the vertical bed. A feeding mechanism is installed on the upper part of the vertical bed, and a core-pulling mechanism is provided inside the feeding mechanism. A square rubber shock-absorbing support is provided between the middle and upper parts of the vertical bed to form a flexible shock-absorbing layer. This invention can not only realize the processing of large-diameter tubes and bars, ensuring the formation of the inner hole of the tube, but also solve the problem that the tubes and bars cannot be effectively forged due to the large mass of the forging die.

Description

Technical Field

[0001] This invention relates to the field of progressive forming technology for tubular parts, specifically to a vertical twin-spindle rotary forging machine. Background Technology

[0002] Rotary forging technology is a precision forming technology for tubes and bars. The forging unit of a rotary forging machine generally has 2 to 8 forging dies that are evenly arranged around the circumference of the workpiece. Driven by the main shaft, they rotate at high speed around the axis. During the rotation, due to the squeezing action of the mushroom head, a short-stroke continuous forging is formed. As a result, the workpiece undergoes local uniform diameter reduction, is formed along the die profile, and is axially extended, thereby completing the small incremental forging deformation of the billet.

[0003] Currently, most domestic equipment manufacturers use single-spindle rotary forging machines, such as the patent application titled "A Rotary Forging Machine for Outer Diameter of Bar Stock" (Publication No.: CN222058720U) and the patent application titled "A New Type of Rotary Forging Machine" (Publication No.: CN216126512U). Single-spindle rotary forging machines have small processing diameters and weak forging capabilities, making them unable to effectively process billets with larger diameters and thicker walls. In addition, most domestic equipment is currently horizontal rotary forging machines, such as the patent application titled "An Automatic Rotary Forging Machine" (Publication No.: CN206343580U) and the patent application titled "A Rotary Forging Machine for Precision Parts" (Publication No.: CN218460748U). Increasing the forging diameter of the rotary forging machine will result in an excessively large forging die mass. During the forging process, due to the influence of gravity, the centrifugal force generated by the rotation of the spindle may be insufficient to lift the forging die, or the forging forces on the upper and lower sides may be different. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a vertical double-spindle rotary forging machine, which can not only realize the processing of large-diameter tubes and bars and ensure the forming of the inner hole of the tube, but also solve the problem that the tubes and bars cannot be effectively forged due to the large mass of the forging die.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A vertical twin-spindle rotary forging machine includes a vertical bed 36, a forging unit 38, a feeding mechanism 39, and a core-pulling mechanism 40. The forging unit 38 is connected to the middle of the vertical bed 36, and a front cover 21 is provided above the forging unit 38, which is connected to the vertical bed 36. The feeding mechanism 39 is installed on the upper part of the vertical bed 36, and the core-pulling mechanism 40 is provided inside the feeding mechanism 39. A square rubber shock-absorbing support 32 is provided between the middle and upper parts of the vertical bed 36 to form a flexible shock-absorbing layer.

[0007] The square rubber shock absorber 32 is composed of rubber layer 34 and steel plate layer 33 stacked alternately.

[0008] The forging unit 38 includes four forging dies 1 arranged rotatably around an axis. Mushroom heads 2 are attached to the outer sides of each forging die 1. Rollers 3 are provided on the outer sides of the mushroom heads 2 and are assembled within roller retainers 4. A large cover plate 22 is provided above the roller retainers 4 and is connected to the roller retainers 4. A large flower plate 10 is provided below the forging dies 1 and mushroom heads 2, and a flower plate cover plate 14 is provided above the forging dies 1 and mushroom heads 2. The flower plate cover plate 14 is fixed to the large flower plate 10, constraining the forging dies 1 and mushroom heads 2 through the large flower plate 10. The degree of freedom allows the forging die 1 and the mushroom head 2 to move only radially; the inner side of the large flower plate 10 is wound with a magnetic levitation coil 35. When the equipment is running, the magnetic levitation coil 35 generates a repulsive force on the forging die 1 and the mushroom head 2, so that the forging die 1 and the mushroom head 2 are suspended; an inner ring shaft 11 is provided below the large flower plate 10. The top of the inner ring shaft 11 is connected to the large flower plate 10, and the bottom of the inner ring shaft 11 is connected to the inner ring driven wheel 12. The inner ring driven wheel 12 is connected to the inner ring motor 13 through belt drive. The inner ring motor 13 is fixed on the left side of the vertical bed 36.

[0009] A steel ring 5 is provided on the outer side of the roller 3. The steel ring 5 is connected to the outer steel ring shell 6. The bottom of the steel ring shell 6 is connected to the outer ring shaft 7. The outer ring shaft 7 is connected to the bottom outer ring driven wheel 8. The outer ring driven wheel 8 is connected to the outer ring motor 9 through belt drive. The outer ring motor 9 is fixed on the right side of the vertical bed 36. The outer ring shaft 7 and the outer ring driven wheel 8 have a large mass and act as flywheels.

[0010] A support ring 16 is provided between the outer ring shaft 7 and the inner ring shaft 11. The inner side of the support ring 16 is fixed to the inner ring shaft 11 by a deep groove ball bearing 17 and a tapered roller bearing 18, and the outer side of the support ring 16 is fixed to the outer ring shaft 7 by an outer ring angular contact ball bearing 19. An end cap 15 is provided at the top of the support ring 16, and the bottom of the support ring 16 is in contact with the vertical bed 36. A rear bearing cap 20 is provided below the tapered roller bearing 18.

[0011] The feeding mechanism 39 includes four slide rails 23 fixed to the upper part of the vertical bed 36. Each slide rail 23 is equipped with a slide table 24, which is connected to the clamping head 25. Four chucks 26 are installed at the bottom of the clamping head 25. Feeding hydraulic cylinders 27 are provided on both sides of the clamping head 25. The feeding hydraulic cylinders 27 are fixed to both sides of the clamping head 25 by feeding hydraulic cylinder positioning plates 31. The bottom of the feeding hydraulic cylinders 27 is connected to the front cover 21 of the housing. The feeding mechanism rear box 28 is provided above the clamping head 25.

[0012] The core feeding and pulling mechanism 40 includes a core feeding and pulling hydraulic cylinder mounting base 29, a core feeding and pulling hydraulic cylinder 30, and a mandrel 37. The core feeding and pulling hydraulic cylinder mounting base 29 is fixed inside the rear box 28 of the feeding mechanism, and the core feeding and pulling hydraulic cylinder 30 is fixed above the core feeding and pulling hydraulic cylinder mounting base 29. The mandrel 37 is assembled at the end of the core feeding and pulling hydraulic cylinder 30, and the mandrel 37 and the core feeding and pulling hydraulic cylinder 30 are rigidly connected by a threaded pair.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. Because the present invention adopts a dual-spindle structure, compared with the single-spindle structure of traditional rotary forging equipment, the forging energy is less limited by the size of the drive steel ring. Arranging a dual-spindle structure in a forging unit with limited space can effectively improve the forging energy and ensure the stable output of forging forming force.

[0015] 2. Since the feeding mechanism of this invention adopts a symmetrical hydraulic cylinder structure, it can avoid the problem of single hydraulic cylinder torque and instability caused by the feeding hydraulic cylinder deviating from the equipment axis in order to prevent interference with the position of the core-pulling hydraulic cylinder. At the same time, the structure of the double feeding hydraulic cylinder arrangement can reduce the vibration of the feeding mechanism during the forging process, ensure feeding accuracy, and increase the upper limit of the maximum feeding force of the feeding mechanism.

[0016] 3. Because this invention adopts a vertical bed structure, it can effectively avoid the problem of increased die mass caused by increasing the forging diameter of the rotary forging machine in traditional horizontal equipment. This can lead to the centrifugal force being unable to effectively overcome the die's own weight when the die mass exceeds the critical value, which can easily cause die lifting failure and asymmetry in forging force between the upper and lower dies. At the same time, a magnetic levitation coil is integrated into the large faceplate structure. During the forging process, a controllable repulsive force field is generated on the die and the mushroom head through real-time electromagnetic control, so that the die and the mushroom head remain suspended during the forging process. This significantly reduces friction and wear between the contact surface and the large faceplate, and increases the service life of the die and the mushroom head.

[0017] 4. Because this invention features a square rubber vibration damping support composed of alternating layers of rubber and steel plates in the middle of the vertical bed, during the forging process, when vibration energy is transmitted from bottom to top through the bed, the horizontal stiffness is mainly determined by the hardness of the rubber itself since the steel plates do not constrain shear deformation. This structure effectively absorbs the horizontal vibration energy generated by the forging unit, thereby significantly reducing the vibration amplitude of the feeding mechanism and the core-pulling mechanism during the forging process, ensuring the motion accuracy and positioning stability of the feeding mechanism and the core-pulling mechanism. Attached Figure Description

[0018] Figure 1 This is a front view of an embodiment of the present invention.

[0019] Figure 2 This is a right sectional view of an embodiment of the present invention.

[0020] Figure 3 This is a front sectional view of the vertical bed according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the square rubber shock-absorbing support according to an embodiment of the present invention.

[0022] Figure 5 This is a right sectional view of the forging unit in an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the cross-section of the roller-mushroom head-forging die according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the structure of the large flower plate of the forging unit in an embodiment of the present invention.

[0025] Figure 8 This is a front view of the feeding mechanism and the core-pulling mechanism in an embodiment of the present invention.

[0026] Figure 9 This is a front sectional view of the feeding mechanism and the core-pulling mechanism in an embodiment of the present invention. Detailed Implementation

[0027] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0028] like Figure 1-4 As shown, a vertical dual-spindle rotary forging machine includes a vertical bed 36, a forging unit 38, a feeding mechanism 39, and a core-pulling mechanism 40. The forging unit 38 is connected to the middle of the vertical bed 36, and a front cover 21 is provided above the forging unit 38. The front cover 21 is connected to the vertical bed 36 by screws. The feeding mechanism 39 is installed on the upper part of the vertical bed 36, and the core-pulling mechanism 40 is provided inside the feeding mechanism 39. A square rubber shock-absorbing support 32 is provided between the middle and upper parts of the vertical bed 36 to form a flexible shock-absorbing layer. The square rubber shock-absorbing support 32 is made of rubber. Layer 34 and steel plate layer 33 are interleaved and superimposed to reduce the vibration of the feeding mechanism 39 during the forging process. When the equipment is running, the vibration energy is transmitted from bottom to top through the vertical bed 36. Since the steel plate layer 33 has no constraint on shear deformation, its horizontal stiffness is mainly determined by the hardness of the rubber layer 34 itself. This structure can effectively absorb the horizontal vibration energy generated by the forging unit 38, thereby significantly reducing the vibration amplitude of the feeding mechanism 39 and the core-pulling mechanism 40 during the forging process, and ensuring the motion accuracy and positioning stability of the feeding mechanism 39 and the core-pulling mechanism 40.

[0029] like Figure 5-7As shown, the forging unit 38 includes four forging dies 1 arranged rotatably around an axis. Mushroom heads 2 are attached to the outer sides of each forging die 1. Rollers 3 are provided on the outer sides of the mushroom heads 2, and the rollers 3 are assembled within a roller retainer 4. A large cover plate 22 is provided above the roller retainer 4, and the large cover plate 22 is connected to the roller retainer 4 by screws. A large flower plate 10 is provided below the forging dies 1 and mushroom heads 2, and a flower plate cover plate 14 is provided above the forging dies 1 and mushroom heads 2. The flower plate cover plate 14 is fixed to the large flower plate 10 by screws. The large flower plate 10 constrains the degrees of freedom of the forging dies 1 and mushroom heads 2, allowing the forging dies 1 and mushroom heads 2 to... The head 2 can only move radially; a magnetic levitation coil 35 is wound around the inner side of the large flower plate 10. When the equipment is running, the magnetic levitation coil 35 generates a repulsive force on the forging die 1 and the mushroom head 2, so that the forging die 1 and the mushroom head 2 are suspended, which significantly reduces the friction and wear between the contact surface and the large flower plate 10; an inner ring shaft 11 is provided below the large flower plate 10. The top of the inner ring shaft 11 is connected to the large flower plate 10 by screws, and the bottom of the inner ring shaft 11 is connected to the inner ring driven wheel 12 by a flat key. The inner ring driven wheel 12 is connected to the inner ring motor 13 by belt drive. The inner ring motor 13 is fixed to the left side of the vertical bed 36 by screws;

[0030] The roller 3 is provided with a steel ring 5 on its outer side. The steel ring 5 is connected to the outer steel ring shell 6 by a flat key. The bottom of the steel ring shell 6 is connected to the outer ring shaft 7 by screws. The outer ring shaft 7 is connected to the bottom outer ring driven wheel 8 by a flat key. The outer ring driven wheel 8 is connected to the outer ring motor 9 by belt drive. The outer ring motor 9 is fixed to the right side of the vertical bed 36 by screws. The outer ring shaft 7 and the outer ring driven wheel 8 have a large mass and can act as a flywheel, with the functions of stabilizing the speed, smoothing the movement and storing energy.

[0031] A support ring 16 is provided between the outer ring shaft 7 and the inner ring shaft 11. The inner side of the support ring 16 is fixed to the inner ring shaft 11 by a deep groove ball bearing 17 and a tapered roller bearing 18, and the outer side of the support ring 16 is fixed to the outer ring shaft 7 by an outer ring angular contact ball bearing 19. An end cap 15 is provided on the top of the support ring 16, and the bottom of the support ring 16 is in contact with the vertical bed 36. A rear bearing cover 20 is provided below the tapered roller bearing 18. When the equipment is running, the outer ring motor 9 drives the outer ring driven wheel 8, the outer ring shaft 7, and the steel ring shell. 6 and steel ring 5 rotate clockwise around the axis. Cage 4 is passively rotated clockwise around the axis by the friction between roller 3 and steel ring 5. Inner ring motor 13 drives inner ring driven wheel 12, inner ring shaft 11 and large flower plate 10 to rotate counterclockwise around the axis. Under the constraint of large flower plate 10, forging die 1 and mushroom head 2 are passively rotated counterclockwise around the axis. Under the action of centrifugal force, mushroom head 2 collides with roller 3 to generate radial downward pressure. Mushroom head 2 transmits the downward pressure to forging die 1. Forging die 1 directly contacts the billet and realizes high-frequency continuous forging of the billet.

[0032] like Figure 1 , Figure 8and Figure 9 As shown, the feeding mechanism 39 includes four slide rails 23 fixed to the upper part of the vertical bed 36. Each slide rail 23 is equipped with a slide table 24, which moves axially along the slide rail 23. The slide table 24 is connected to the clamping head 25 by screws. Four chucks 26 are installed at the bottom of the clamping head 25. Feeding hydraulic cylinders 27 are provided on both sides of the clamping head 25. The feeding hydraulic cylinders 27 are fixed to both sides of the clamping head 25 by feeding hydraulic cylinder positioning plates 31. The bottom of the feeding hydraulic cylinders 27 is connected to the front cover 21 of the housing by nuts. The feeding mechanism rear box 28 is provided above the clamping head 25.

[0033] The core feeding and pulling mechanism 40 includes a core feeding and pulling hydraulic cylinder mounting base 29, a core feeding and pulling hydraulic cylinder 30, and a mandrel 37. The core feeding and pulling hydraulic cylinder mounting base 29 is fixed inside the rear box 28 of the feeding mechanism by screws. The core feeding and pulling hydraulic cylinder 30 is fixed above the core feeding and pulling hydraulic cylinder mounting base 29 by screws. The mandrel 37 is assembled at the end of the core feeding and pulling hydraulic cylinder 30. The mandrel 37 and the core feeding and pulling hydraulic cylinder 30 are rigidly connected by a precision-machined thread pair. When it is necessary to process the blank, the clamping head 25 controls the chuck 26 to retract, thereby clamping and fixing the blank. The feeding hydraulic cylinders 27 on both sides are activated. The feeding mechanism 39 and the core-pulling mechanism 40 can be driven to move along the slide rail 23 toward the forging unit 38. When the billet approaches the forging unit 38, the feeding mechanism 39 stops moving, the core-pulling hydraulic cylinder 30 extends and stops the mandrel 37 at the feed port of the forging unit 38. Then the feeding hydraulic cylinder 27 drives the feeding mechanism 39 and the core-pulling mechanism 40 to move slowly downward to realize the forging of the billet. During the forging, the core-pulling hydraulic cylinder 30 slowly retracts to ensure that the mandrel 37 and the forging die 1 remain relatively stationary in the axial direction. After the forging is completed, the feeding mechanism 39 and the core-pulling mechanism 40 retract simultaneously under the drive of the feeding hydraulic cylinder 27.

Claims

1. A vertical twin-spindle rotary forging machine, comprising a vertical bed (36), a forging unit (38), a feeding mechanism (39), and a core-pulling mechanism (40); characterized in that: The forging unit (38) is connected to the middle of the vertical bed (36). A box front cover (21) is provided above the forging unit (38), and the box front cover (21) is connected to the vertical bed (36). A feeding mechanism (39) is installed on the upper part of the vertical bed (36), and a core feeding and pulling mechanism (40) is provided inside the feeding mechanism (39). A square rubber shock-absorbing support (32) is provided between the middle and upper parts of the vertical bed (36) to form a flexible shock-absorbing layer. The forging unit (38) includes four forging dies (1) arranged rotatably around an axis. Mushroom heads (2) are attached to the outer sides of each forging die (1). Rollers (3) are provided on the outer sides of the mushroom heads (2). The rollers (3) are assembled in a roller retainer (4). A large cover plate (22) is provided above the roller retainer (4). The large cover plate (22) is connected to the roller retainer (4). A large flower plate (10) is provided below the forging die (1) and the mushroom head (2). A flower plate cover plate (14) is provided above the forging die (1) and the mushroom head (2). The flower plate cover plate (14) is fixed to the large flower plate (10). The large flower plate (10) constrains the forging die (1) and the mushroom head. (2) The degree of freedom allows the forging die (1) and the mushroom head (2) to move only radially; the inner side of the large flower plate (10) is wound with a magnetic levitation coil (35). When the equipment is running, the magnetic levitation coil (35) generates a repulsive force on the forging die (1) and the mushroom head (2), so that the forging die (1) and the mushroom head (2) are suspended; an inner ring shaft (11) is provided below the large flower plate (10). The top of the inner ring shaft (11) is connected to the large flower plate (10), and the bottom of the inner ring shaft (11) is connected to the inner ring driven wheel (12). The inner ring driven wheel (12) is connected to the inner ring motor (13) through belt drive. The inner ring motor (13) is fixed on the left side of the vertical bed (36); The roller (3) is provided with a steel ring (5) on the outside. The steel ring (5) is connected to the outer steel ring shell (6). The bottom of the steel ring shell (6) is connected to the outer ring shaft (7). The outer ring shaft (7) is connected to the bottom outer ring driven wheel (8). The outer ring driven wheel (8) is connected to the outer ring motor (9) through belt drive. The outer ring motor (9) is fixed on the right side of the vertical bed (36). The outer ring shaft (7) and the outer ring driven wheel (8) have large mass and act as flywheels. A support ring (16) is provided between the outer ring shaft (7) and the inner ring shaft (11). The inner side of the support ring (16) is fixed to the inner ring shaft (11) by a deep groove ball bearing (17) and a tapered roller bearing (18). The outer side of the support ring (16) is fixed to the outer ring shaft (7) by an outer ring angular contact ball bearing (19). An end cap (15) is provided on the top of the support ring (16). The bottom of the support ring (16) is in contact with the vertical bed (36). A rear bearing cap (20) is provided below the tapered roller bearing (18).

2. The vertical twin-spindle rotary forging machine according to claim 1, characterized in that: The square rubber shock absorber (32) is composed of rubber layer (34) and steel plate layer (33) stacked together.

3. A vertical twin-spindle rotary forging machine according to claim 1, characterized in that: The feeding mechanism (39) includes four slide rails (23) fixed on the upper part of the vertical bed (36). Each slide rail (23) is equipped with a slide table (24). The slide table (24) is connected to the clamping head (25). Four chucks (26) are installed at the bottom of the clamping head (25). Feeding hydraulic cylinders (27) are provided on both sides of the clamping head (25). The feeding hydraulic cylinders (27) are fixed on both sides of the clamping head (25) by feeding hydraulic cylinder positioning plates (31). The bottom of the feeding hydraulic cylinders (27) is connected to the front cover (21) of the housing. The feeding mechanism rear box (28) is provided above the clamping head (25).

4. A vertical twin-spindle rotary forging machine according to claim 3, characterized in that: The core feeding and pulling mechanism (40) includes a core feeding and pulling hydraulic cylinder mounting base (29), a core feeding and pulling hydraulic cylinder (30), and a mandrel (37). The core feeding and pulling hydraulic cylinder mounting base (29) is fixed inside the rear box (28) of the feeding mechanism. The core feeding and pulling hydraulic cylinder (30) is fixed above the core feeding and pulling hydraulic cylinder mounting base (29). The end of the core feeding and pulling hydraulic cylinder (30) is equipped with a mandrel (37). The mandrel (37) and the core feeding and pulling hydraulic cylinder (30) are rigidly connected by a threaded pair.

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