Rotary swaging machine forging unit for forming complex part with large length-diameter ratio

Abstract

A forging unit of a rotary swaging machine for forming complex parts with large length-diameter ratios comprises a box body structure, a driving motor is connected to the upper portion of the box body structure, and the driving motor is connected with a forging mechanism in the box body structure; the forging mechanism comprises two rows of roller retainers, four mushroom heads are arranged in each of the two rows of roller retainers, and a synchronous retainer is arranged between the two rows of roller retainers to realize synchronous movement; the method can realize processing and forming of complex parts with large length-diameter ratio, and has the advantages of low cost, high efficiency and high performance.

Description

Technical Field

[0001] The present invention relates to the technical field of tube part processing and forming, and particularly relates to a rotary forging unit for forming large aspect ratio complex parts. Background Art

[0002] At present, large aspect ratio complex parts are widely used in the military, aerospace and other fields. Such parts usually have the characteristics of large size, high structural consistency requirements and complex shape. Common processing technologies, such as split forging and welding forming and numerical control processing technology, have many problems: the split forging and welding forming process is prone to wall thickness mutation, and due to multi-section welding, there are problems such as residual stress concentration, pore residue and poor structural consistency in the weld area. The numerical control processing technology can process large aspect ratio complex parts, but its processing process is complex, the efficiency is low and the cost is high, and it is difficult to achieve high-efficiency forming. Rotary forging technology uses high-frequency radial forging to achieve local necking and axial extension of workpieces, and can achieve cold forming of high-strength metal materials. It is a precision forging technology for shaft parts with high efficiency and low cost. At present, when there are significant defects in the manufacturing process of large aspect ratio complex parts, rotary forging technology shows great advantages and development potential.

[0003] At present, most of the rotary forging equipment used by manufacturers is single-sided drive rotary forging machines, such as the patent application with the name of "Rotary Forging Mechanism and Rotary Forging Processing Device for Thin-Walled Ultra-Long Variable-Diameter Metal Rods and Tubes" (Publication No.: CN105328100A) and the patent application with the name of "A Multifunctional Precision AC Servo Rotary Forging Machine" (Publication No.: CN103894528A). The forging unit of the rotary forging machine uses a single set of forging dies and a single driving wheel and other structures to achieve radial forging. The limitations brought by the single set of forging dies and the single driving wheel make the forging ability of the forging unit of this type of rotary forging machine weak, the forging stability poor, the length of the workpieces that can be processed short, the diameter small, and the structure simple, and it is impossible to efficiently process and form large aspect ratio complex parts with larger diameter and longer length. Summary of the Invention

[0004] In order to overcome the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a rotary forging unit for forming large aspect ratio complex parts, which can realize the processing and forming of large aspect ratio complex parts, and has the advantages of low cost, high efficiency and high performance.

[0005] In order to achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] A rotary forging machine forging unit for forming complex parts with a large length-diameter ratio, including a box structure, a driving motor 1 is connected above the box structure, and the driving motor 1 is connected to the forging mechanism inside the box structure; the box structure includes an outer box 22, a box front cover 13 is connected in front of the outer box 22, a front cover 23 is connected in front of the box front cover 13, a pulley cover 15 is connected behind the outer box 22, the driving motor 1 is connected above the outer box 22, and the forging mechanism is connected inside the outer box 22.

[0007] The forging mechanism includes four forging dies 10 symmetrically arranged in the circumferential direction. One side of the outer surface of the forging die 10 is attached to the secondary mushroom head 6, and the other side is attached to the main mushroom head 7; a small roller 4 is arranged outside the secondary mushroom head 6, the small roller 4 is assembled in the small roller cage 11, a small steel ring 2 is arranged outside the small roller 4, and the small steel ring 2 is connected to the steel ring housing 14; a large roller 5 is arranged outside the main mushroom head 7, the large roller 5 is assembled in the large roller cage 12, a large steel ring 3 is arranged outside the large roller 5, and the large steel ring 3 is connected to the steel ring housing 14. The steel ring housing 14 is fixed inside the outer box 22 by interference fit; a synchronous cage 8 is arranged between the small roller cage 11 and the large roller cage 12 to maintain synchronous rotation.

[0008] Large flower plates 16 are connected to the front and rear of the main mushroom head 7 and the secondary mushroom head 6. The degrees of freedom of the main mushroom head 7 and the secondary mushroom head 6 are restricted by the large flower plates 16, so that the forging die 10, the main mushroom head 7 and the secondary mushroom head 6 can only move radially; a deep groove ball bearing 20 is connected outside the large flower plate 16, a end cover 21 is connected outside the deep groove ball bearing 20, the outside of the end cover 21 is connected to the steel ring housing 14, and the rear of the end cover 21 is attached to the outer box 22.

[0009] A front driven wheel 9 is connected in front of the large flower plate 16, and a rear driven wheel 17 is arranged behind the large flower plate 16. The outside of the flower plate shaft 18 is connected to the rear driven wheel 17; the outside of the flower plate shaft 18 is connected to an outer ring angular contact ball bearing 19, and the outside of the outer ring angular contact ball bearing 19 is attached to the outer box 22; the front driven wheel 9 and the rear driven wheel 17 are connected to the driving motor 1 through a belt.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] 1. Since the present invention uses a two-side drive structure (front driven wheel 9, rear driven wheel 17) to drive the forging unit, it solves the problems of insufficient centrifugal force and inconsistent forging force during the processing of complex parts with a large length-diameter ratio. During forging, due to the excessive mass of the forging die of complex parts with a large length-diameter ratio, the forging unit may have difficulty in overcoming the self-weight of the forging die with centrifugal force, resulting in uneven forging. The two-side drive structure can provide a large centrifugal force, enabling the forging die to more easily overcome its self-weight, so that the forging force conduction in the upper and lower forging die cavities is consistent, eliminating the structural inconsistency caused by the difference in forging force between the upper and lower sides, and realizing the high-precision forming of complex parts with a large length-diameter ratio.

[0012] 2. Since the present invention adopts a structure of two groups of mushroom heads (auxiliary mushroom head 6, main mushroom head 7) and a synchronous cage 8, it effectively improves the consistency of the forging force received by the front and rear ends of the part when the forging unit processes complex parts with a large length-diameter ratio. In the traditional single-group mushroom head structure, due to the long length and large mass of a single mushroom head, when processing a long workpiece, there will be a situation of unbalanced force transmission of the mushroom head, deviation of the movement direction, and uneven forging at the front and rear ends. The present invention optimizes the force transmission situation through two groups of front and rear mushroom heads, and optimizes the overall forging situation using a synchronous cage, effectively reducing the mass and length of a single mushroom head, improving the force conduction stability and movement accuracy of the mushroom head, and solving the problems of low machining accuracy and poor structural consistency of complex parts with a large length-diameter ratio.

[0013] 3. In the traditional single-side drive structure, when processing parts with a long length, the forging unit often has too large deflection at the front and rear ends, resulting in poor forging stability and reduced forming accuracy. The two-side drive structure adopted by the present invention can effectively improve the vibration situation at the front and rear ends of the equipment through reasonable load distribution design, improve the stability of the forging force when processing complex parts with a large length-diameter ratio, and solve the problems of poor forging stability and low forming accuracy of complex parts with a large length-diameter ratio at the structural design level. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the front view of the embodiment of the present invention.

[0015] Figure 2 is the left view of the embodiment of the present invention.

[0016] Figure 3 is the top view of the embodiment of the present invention.

[0017] Figure 4 is the left sectional view of the embodiment of the present invention.

[0018] Figure 5 is the front view of the roller-mushroom head-forging die of the embodiment of the present invention.

[0019] Figure 6 is the left sectional view of the roller-mushroom head-forging die of the embodiment of the present invention.

[0020] Figure 7 It is a schematic structural diagram of the large flower plate in the embodiment of the present invention.

[0021] Figure 8 It is a schematic structural diagram of the forging die in the embodiment of the present invention. Detailed implementation manners

[0022] The technical solution of the present invention will be further described below in conjunction with the embodiments and the drawings.

[0023] As Figure 1 、 Figure 2 、 Figure 3 shown, a rotary forging unit for forming complex parts with a large length-diameter ratio includes a box structure, a driving motor 1 and a forging mechanism. The driving motor 1 is connected above the box structure, and the driving motor 1 is connected to the forging mechanism inside the box structure; the box structure includes an outer box 22, the front of the outer box 22 is connected to the front cover of the box 13 by bolts, the front of the front cover of the box 13 is connected to the front cover 23 by bolts, the rear of the outer box 22 is connected to the pulley cover 15 by bolts, the driving motor 1 is connected above the outer box 22 by bolts, and the forging mechanism is connected inside the outer box 22 by bolts.

[0024] As Figures 4 - 8 shown, the forging mechanism includes four forging dies 10 symmetrically arranged along the circumferential direction. One side of the outer surface of the forging die 10 is in contact with the sub-mushroom head 6, and the other side is in contact with the main mushroom head 7; small rollers 4 are arranged on the outer side of the sub-mushroom head 6, the small rollers 4 are assembled in the small roller cage 11, a small steel ring 2 is arranged on the outer side of the small rollers 4, and the small steel ring 2 is connected to the steel ring housing 14 by a flat key; large rollers 5 are arranged on the outer side of the main mushroom head 7, the large rollers 5 are assembled in the large roller cage 12, a large steel ring 3 is arranged on the outer side of the large rollers 5, and the large steel ring 3 is connected to the steel ring housing 14 by a flat key. The steel ring housing 14 is fixed inside the outer box 22 by interference fit; a synchronous cage 8 is arranged between the small roller cage 11 and the large roller cage 12, and the small roller cage 11 and the large roller cage 12 are coordinated through the synchronous cage 8 to maintain synchronous rotation.

[0025] Both the front and rear of the main mushroom head 7 and the sub-mushroom head 6 are connected with large flower plates 16. The degrees of freedom of the main mushroom head 7 and the sub-mushroom head 6 are restricted by the large flower plates 16, so that the forging die 10, the main mushroom head 7 and the sub-mushroom head 6 can only move radially.

[0026] A deep groove ball bearing 20 is connected to the outside of the large flower plate 16, an end cover 21 is connected to the outside of the deep groove ball bearing 20, the outside of the end cover 21 is connected to the steel ring housing 14, and the rear of the end cover 21 is in contact with the outer box 22.

[0027] A front driven wheel 9 is arranged in front of the large flower disc 16, and the front driven wheel 9 is connected to the large flower disc 16 by a key; a flower disc shaft 18 is arranged behind the large flower disc 16, and the flower disc shaft 18 is connected to the large flower disc 16 by a key. A rear driven wheel 17 is connected to the outside of the flower disc shaft 18; an outer ring angular contact ball bearing 19 is connected to the outside of the flower disc shaft 18, and the outside of the outer ring angular contact ball bearing 19 is fitted with an outer box body 22; the front driven wheel 9 and the rear driven wheel 17 are connected to a driving motor 1 by a belt.

[0028] When the equipment is running, the driving motor 1 drives the front driven wheel 9 and the rear driven wheel 17 to rotate clockwise around the axis. The forging die 10, the main mushroom head 7 and the auxiliary mushroom head 6 are driven to rotate clockwise around the axis passively under the constraint of the large flower disc 16; during the rotation, due to the action of centrifugal force, the main mushroom head 7 collides with the large roller 5 to generate a radial downward pressure, and the auxiliary mushroom head 6 collides with the small roller 4 to generate a radial downward pressure; the main mushroom head 7 and the auxiliary mushroom head 6 conduct the radial downward pressure to the forging die 10, and the cavity of the forging die 10 contacts the large aspect ratio complex part to be processed, completing the high-frequency forging of the large aspect ratio complex part.

Claims

1. A rotary forging machine forging unit for forming complex parts with a large aspect ratio, comprising a box structure, characterized in that: The top of the box structure is connected to a driving motor (1), and the driving motor (1) is connected to a forging mechanism inside the box structure; the box structure comprises an outer box (22), the front of the outer box (22) is connected to a box front cover (13), the front of the box front cover (13) is connected to a front cover cover (23), the rear of the outer box (22) is connected to a pulley cover (15), the top of the outer box (22) is connected to the driving motor (1), and the inside of the outer box (22) is connected to the forging mechanism.

2. The rotary forging unit according to claim 1, characterized in that: The forging mechanism comprises four forging dies (10) arranged symmetrically along the circumferential direction, one side of the outer surface of the forging die (10) is fitted with the auxiliary mushroom head (6), and the other side is fitted with the main mushroom head (7); a small roller (4) is arranged on the outer side of the auxiliary mushroom head (6), the small roller (4) is assembled in the small roller retainer (11), a small steel ring (2) is arranged on the outer side of the small roller (4), and the small steel ring (2) is connected to the steel ring shell (14); a large roller (5) is arranged on the outer side of the main mushroom head (7), the large roller (5) is assembled in the large roller retainer (12), a large steel ring (3) is arranged on the outer side of the large roller (5), the large steel ring (3) is connected to the steel ring shell (14), and the steel ring shell (14) is fixed inside the outer box (22) by interference fit; a synchronous retainer (8) is arranged between the small roller retainer (11) and the large roller retainer (12) to maintain synchronous rotation; The main mushroom head (7) and the auxiliary mushroom head (6) are both connected to large faceplates (16) at the front and rear, and the large faceplates (16) are used to constrain the freedom of the main mushroom head (7) and the auxiliary mushroom head (6), so that the forging die (10), the main mushroom head (7) and the auxiliary mushroom head (6) can only move in the radial direction; the outer side of the large faceplate (16) is connected to a deep groove ball bearing (20), the outer side of the deep groove ball bearing (20) is connected to an end cover (21), the outer side of the end cover (21) is connected to the steel ring shell (14), and the rear side of the end cover (21) is fitted with the outer box body (22); The front of the large faceplate (16) is connected to a front driven wheel (9), and the outer side of a faceplate shaft (18) provided at the rear of the large faceplate (16) is connected to a rear driven wheel (17); the outer side of the faceplate shaft (18) is connected to an outer ring angular contact ball bearing (19), and the outer side of the outer ring angular contact ball bearing (19) is in contact with an outer box body (22); the front driven wheel (9) and the rear driven wheel (17) are connected to a driving motor (1) via a belt.

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