Integrated cold heading forming device for double-step bushing
By designing a double step bushing integrated cold heading forming device, the opposite cold heading stamping of the top column and the upper pressing die, combined with the limit of the mold cavity, the problems of blank deformation and inner wall smoothness in bushing processing are solved, and high-quality molding and improved sealing performance are achieved.
Patent Information
- Application Number
- CN202421983854.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-16
AI Technical Summary
During the bushing processing, the tubular blank is prone to deforming toward the middle part when pressed down, affecting the processing quality. It is difficult to ensure the smoothness of the middle inner wall of the bushing with the central pressing rod alone, affecting the sealing performance and wear of mechanical components.
A double step bushing integrated cold heading forming device is designed, and the upper and lower ends of the pipe pile blank is achieved through the opposite cold heading stamping of the top column and the upper pressing die, combined with the limit of the mold cavity. At the same time, the top column rotates synchronously when rising, improves the smoothness of the inner wall of the bushing when expanding the diameter, and rotates in reverse when the mold is depressed, further improving the smoothness of the inner wall.
The deformation of the bushing towards the middle is effectively avoided, the forming quality is ensured, and the smoothness of the bushing inner wall is improved through rotational movement, the sealing performance is improved and the wear of mechanical components is reduced.
Smart Images
Figure CN222931762U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of bushing processing, and particularly relates to a double-step bushing integrated cold heading forming device. Background Technique
[0002] A bushing is a matching part used outside mechanical components to achieve functions such as sealing and wear protection, and refers to a ring sleeve that acts as a gasket. When processing a bushing, a tubular blank is generally placed in a cold heading die cavity, and then cold heading is carried out by downward pressing to form it.
[0003] Since the blank during the downward pressing of the bushing is tubular, when forming upper and lower steps by downward pressing, the bushing is prone to deform towards the middle, affecting the processing quality; currently, a central pressure rod is provided to perform central positioning on the bushing tube during downward pressing to avoid deformation towards the middle, but it is difficult to ensure the smoothness of the inner wall of the middle part of the bushing only by the downward pressing of the pressure rod, which further affects the sealing of the bushing and increases the wear on mechanical components. Summary of the Utility Model
[0004] The utility model provides a double-step bushing integrated cold heading forming device. When the top column and the upper pressing die perform cold heading stamping in opposite directions up and down, with the limitation of the forming die cavity, the pipe pile blank is integrally formed into a bushing with double steps at the upper and lower ends, avoiding the deformation of the bushing towards the middle; when the top column rises, it rotates synchronously. While expanding the diameter, the smoothness of the inner wall of the bushing is improved, and when the die is withdrawn and lowered, the top column rotates in the reverse direction, further improving the smoothness of the inner wall of the bushing, so as to solve the problems raised in the above background technique.
[0005] To achieve the above object, the utility model provides the following technical solution: A double-step bushing integrated cold heading forming device, including a base, a lower forming die table is installed on the base, a forming die cavity is arranged on the upper part of the lower forming die table, two steps are arranged in the forming die cavity, a top column through hole is arranged in the center of the lower forming die table, a support frame is fixed below the base, a telescopic cylinder is fixed on the support frame, the piston rod of the telescopic cylinder is connected with a top column through a rotary joint, a spiral groove is arranged on the lower part of the top column, a lead screw pair is installed on the base and is in screw transmission connection with the lower part of the top column, the upper part of the top column penetrates through the top column through hole, the top column is in smooth and sealed contact with the inner wall of the top column through hole, four columns are welded on the top of the base, a top plate is fixed on the top of the columns, a downward pressing cylinder is fixed on the top plate, the piston rod of the downward pressing cylinder penetrates through the top plate and is fixed with an upper pressing die, and a receiving cavity adapted to the top column is arranged in the upper pressing die.
[0006] Preferably, the top end of the top column is of a conical head structure.
[0007] Preferably, an avoidance groove is arranged on the lower part of the lower forming die table.
[0008] Preferably, an installation edge is provided at the bottom edge of the lower forming die table, and a plurality of screw holes are provided on the installation edge and fixedly connected to the base through bolts.
[0009] Preferably, a hole sleeving the column is provided on the installation edge.
[0010] Preferably, a plurality of reinforcing ribs are provided between the bottom of the lower forming die table and the installation edge.
[0011] Preferably, a vent hole penetrating the accommodation cavity is provided at the upper part of the upper pressing die.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0013] 1. When the top column and the upper pressing die perform cold upsetting stamping in opposite directions up and down, with the limitation of the forming die cavity, the pipe pile blank is integrally formed into a bushing with double steps at the upper and lower ends, avoiding the deformation of the bushing towards the middle.
[0014] 2. When the top column rises, it rotates synchronously. While expanding the diameter, the smoothness of the inner wall of the bushing is improved. And when it descends during mold withdrawal, the top column rotates in the reverse direction, further improving the smoothness of the inner wall of the bushing. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is the front sectional structure schematic diagram of the present utility model;
[0016] Figure 2 is the schematic diagram of the top column and spiral groove structure of the present utility model;
[0017] Figure 3 is the schematic diagram of the cold upsetting structure of the product of the present utility model;
[0018] Figure 4 is the schematic diagram of the product of the present utility model;
[0019] Figure 5 is the front view structure schematic diagram of the present utility model;
[0020] Figure 6 is the top view structure schematic diagram of the lower forming die table, forming die cavity, top column through hole and installation edge of the present utility model.
[0021] In the figure: 1. Base; 2. Lower forming die table; 3. Forming die cavity; 4. Top column through hole; 5. Support frame; 6. Telescopic cylinder; 7. Rotary joint; 8. Top column; 9. Spiral groove; 10. Lead screw pair; 11. Column; 12. Top plate; 13. Lower pressing cylinder; 14. Upper pressing die; 15. Accommodation cavity; 16. Avoidance groove; 17. Installation edge; 18. Hole; 19. Reinforcing rib; 20. Vent hole. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0023] Please refer to Figures 1-6 , the present utility model provides a double-step bushing integrated cold heading forming device, including a base 1, a lower forming die table 2 is installed on the base 1, an upper part of the lower forming die table 2 is provided with a forming die cavity 3, two steps are arranged in the forming die cavity 3, a punch through hole 4 is arranged at the center of the lower forming die table 2, a support frame 5 is fixed below the base 1, a telescopic cylinder 6 is fixed on the support frame 5, a piston rod of the telescopic cylinder 6 is connected with a punch 8 through a rotary joint 7, a spiral groove 9 is arranged at a lower part of the punch 8, a lead screw pair 10 which is in screw transmission connection with the lower part of the punch 8 is installed on the base 1, an upper part of the punch 8 penetrates through the punch through hole 4, and the punch 8 is in smooth and sealed contact with an inner wall of the punch through hole 4; four columns 11 are welded on a top of the base 1, a top plate 12 is fixed on tops of the columns 11, a downward pressure cylinder 13 is fixed on the top plate 12, a piston rod of the downward pressure cylinder 13 penetrates through the top plate 12 and then is fixed with an upper pressure die 14, and a receiving cavity 15 adapted to the punch 8 is arranged in the upper pressure die 14; during processing, a tubular blank is placed in the forming die cavity 3 of the lower forming die table 2, an inner diameter thereof is smaller than an inner diameter of a formed product, and an outer diameter thereof is smaller than a diameter of an inner wall of the forming die cavity 3. Then, the telescopic cylinder 6 is started to drive the rotary joint 7 and the punch 8 to rise, and the downward pressure cylinder 13 drives the upper pressure die 14 to descend. When the rising punch 8 gives an expanded diameter to the tubular blank, the upper pressure die 14 performs upper end edge pressing to form an upper step. When the punch 8 and the upper pressure die 14 perform cold heading stamping in opposite directions up and down until the punch 8 fully enters the receiving cavity 15 and is limited by the forming die cavity 3, the pipe pile blank is integrally formed into a bushing with double steps at upper and lower ends; and when the punch 8 rises, since the punch 8 and the telescopic cylinder 6 are rotationally connected through the rotary joint 7 and cooperate with the screw transmission of the lead screw pair 10, the punch 8 rotates synchronously when rising. While expanding the diameter, the smoothness of the inner wall of the bushing is improved, and when the die is withdrawn and descends, the punch 8 rotates in the reverse direction, further improving the smoothness of the inner wall of the bushing.
[0024] Specifically, a top end of the punch 8 is of a tapered head structure; in this embodiment, it is convenient for the punch 8 to rise and expand the diameter for stamping.
[0025] Specifically, an avoidance groove 16 is arranged at a lower part of the lower forming die table 2; in this embodiment, the avoidance groove 16 can provide an avoidance space for the installation of the lead screw pair 10 and does not interfere with its installation and disassembly.
[0026] Specifically, an installation edge 17 is provided at the bottom edge of the lower forming die table 2. A plurality of screw holes are provided on the installation edge 17 and are fixedly connected to the base 1 through bolts. In this embodiment, the lower forming die table 2 can be conveniently installed and disassembled through bolts, which is beneficial for cleaning or replacing the lower forming die table 2.
[0027] Specifically, a hole 18 that sleeves outside the column 11 is provided on the installation edge 17. In this embodiment, the installation edge 17 cooperates with the column 11, and the column 11 can position the lower forming die table 2 to improve the position accuracy of the lower forming die table 2.
[0028] Specifically, a plurality of reinforcing ribs 19 are provided between the bottom of the lower forming die table 2 and the installation edge 17. In this embodiment, the plurality of reinforcing ribs 19 can improve the connection strength between the lower forming die table 2 and the installation edge 17 and improve the stability during use.
[0029] Specifically, a vent hole 20 that penetrates through the accommodation cavity 15 is provided on the upper part of the upper pressing die 14. In this embodiment, when the ejector pin 8 and the upper pressing die 14 perform cold heading and stamping in opposite directions up and down, the ejector pin 8 fully enters the accommodation cavity 15, and the air in the accommodation cavity 15 can be discharged from the vent hole 20.
[0030] To facilitate the understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in the actual process will be described in detail below.
[0031] Working principle: During processing, the tubular blank is placed into the forming die cavity 3 of the lower forming die table 2. Its inner diameter is smaller than the inner diameter of the formed product, and its outer diameter is smaller than the inner diameter of the inner wall of the forming die cavity 3. Then, the telescopic cylinder 6 is started to drive the rotary joint 7 and the ejector pin 8 to rise, and the lower pressing cylinder 13 drives the upper pressing die 14 to descend. When the rising ejector pin 8 gives an expanded diameter to the tubular blank, the upper pressing die 14 forms an upper end step at the upper end by pressing the edge. When the ejector pin 8 and the upper pressing die 14 perform cold heading and stamping in opposite directions up and down, until the ejector pin 8 fully enters the accommodation cavity 15, with the limitation of the forming die cavity 3, the pipe pile blank is integrally formed into a bushing with double steps at the upper and lower ends. And when the ejector pin 8 rises, since the ejector pin 8 and the telescopic cylinder 6 are rotationally connected through the rotary joint 7 and cooperate with the screw drive of the lead screw pair 10, when the ejector pin 8 rises, it rotates synchronously. While expanding the diameter, the smoothness of the inner wall of the bushing is improved. And when retracting the die and descending, the ejector pin 8 will rotate in the reverse direction to further improve the smoothness of the inner wall of the bushing.
[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A double-step bushing integrated cold heading forming device, comprising a base (1), characterized in that: A lower molding die table (2) is mounted on the base (1), a molding die cavity (3) is disposed on the upper portion of the lower molding die table (2), two steps are disposed in the molding die cavity (3), a top column through hole (4) is disposed at the center of the lower molding die table (2), a support frame (5) is fixed below the base (1), a telescopic cylinder (6) is fixed on the support frame (5), a piston rod of the telescopic cylinder (6) is connected to a top column (8) via a rotary joint (7), a spiral groove (9) is disposed at the lower portion of the top column (8), and a screw thread (1) is mounted on the base (1) to connect the top column (8) to the bottom portion of the top column (8). A screw pair (10) connected by a screw drive, the upper part of the top column (8) passes through the top column through hole (4), the top column (8) is in smooth and sealed contact with the inner wall of the top column through hole (4), four columns (11) are welded on the top of the base (1), a top plate (12) is fixed on the top of the column (11), a downward pressure cylinder (13) is fixed on the top plate (12), the piston rod of the downward pressure cylinder (13) passes through the top plate (12) and is fixed with an upper pressure die (14), and a accommodating cavity (15) adapted to the top column (8) is provided in the upper pressure die (14).
2. A double-step bushing integrated cold heading forming device according to claim 1, characterized in that: The top end of the top column (8) is a conical head structure.
3. The double-step bushing integrated cold heading forming device according to claim 1, characterized in that: The lower part of the lower molding die platform (2) is provided with an avoidance groove (16).
4. A double-step bushing integrated cold heading forming device according to claim 1, characterized in that: The bottom edge of the lower molding die platform (2) is provided with a mounting edge (17), and a plurality of screw holes are provided on the mounting edge (17), which is fixedly connected to the base (1) by means of bolts.
5. A double-step bushing integrated cold heading forming device according to claim 4, characterized in that: The installation edge (17) is provided with a hole (18) which is sleeved outside the column (11).
6. A double-step bushing integrated cold heading forming device according to claim 4, characterized in that: A plurality of reinforcing ribs (19) are provided between the bottom of the lower molding die platform (2) and the mounting edge (17).
7. The double-step bushing integrated cold heading forming device according to claim 1, characterized in that: The upper portion of the upper die (14) is provided with a vent hole (20) penetrating the accommodating cavity (15).