Pipe expanding die
By designing the pipe expansion mold, the radial expansion of the inner wall of the pipe is achieved by using the combination of the expansion array assembly and the inner support rod, the problems of die wear and operation complexity in the prior art are solved, and the processing efficiency and equipment life are improved.
Patent Information
- Application Number
- CN202421351653.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-06-13
AI Technical Summary
During the process of flaring of existing metal pipes, the huge sliding friction between the die and the inner wall of the pipe causes severe wear of the die, and requires oil injection lubrication to increase operational complexity.
A pipe expansion mold is designed, using a combination of an expansion array assembly and an inner support rod, and the inner wall of the pipe is exerted by the radial movement of the expansion member to avoid axial sliding friction.
It reduces friction and wear on the surface of the expansion member, extends service life, and reduces the wear resistance requirements for material, while avoiding oil injection lubrication operations, simplifying the processing process.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of metal pipe processing, in particular to a pipe expansion die. Background Art
[0002] In the prior art, when the port of a metal pipe is expanded, a punch (expansion mold) is used to punch the end of the pipe. Since the outer diameter of the punch is larger than the port diameter of the pipe, the punch expands the end of the pipe outward after punching into the port of the pipe, so that the end of the pipe forms an expanded structure.
[0003] During the traditional expansion process, as the die moves along the axial direction of the tube and punches into the port of the tube, huge sliding friction is generated between the die and the inner wall of the tube. During long-term use, the die surface will be severely worn. In order to minimize the friction between the die and the inner wall of the tube, oil spray lubrication is also required between the punch and the tube during the stamping process, which increases the complexity of the processing operation. Summary of the invention
[0004] The utility model aims to solve the deficiencies in the prior art and provide a pipe expansion die.
[0005] The purpose of the utility model is achieved through the following technical solutions: a pipe expansion die, including a punch seat, an expansion piece limiting component, and an expansion piece, an expansion piece array assembly is provided on the expansion piece limiting component, the expansion piece array assembly is composed of a plurality of expansion pieces arranged in a circular array, a second spring is provided between the expansion piece and the expansion piece limiting component; an inner support core rod is provided on the punch seat, a conical surface is provided on the inner support core rod, and each expansion piece on the expansion piece array assembly is in contact with the conical surface on the inner support core rod; a guide reset mechanism is provided between the punch seat and the expansion piece limiting component.
[0006] In the utility model, the inner support core rod extends into the central position of the expansion member array assembly. When the inner support core rod moves along one direction, each expansion member moves toward the radial outer side of the expansion member array assembly under the action of the conical surface on the inner core rod. When the inner support core rod moves along the other direction, each expansion member moves toward the center direction of the expansion member array assembly under the action of the second spring. The punch seat is connected to the driving device, and the punch seat is driven by the driving member to move along the axial direction of the inner support core rod. When the pipe is expanded, the punch seat moves forward to allow one end of the expansion piece to extend into the port of the pipe, and the expansion piece limit component contacts one end of the pipe, and then the inner support core rod continues to move, and under the action of the conical surface on the inner core rod, each expansion piece moves toward the radial outside of the expansion piece array assembly, so that the expansion piece array assembly expands as a whole, thereby expanding the end of the pipe and forming an expanded structure at the end of the pipe; after the expansion is completed, the punch seat retreats, and each expansion piece moves toward the center direction of the expansion piece array assembly and resets under the action of the second spring, and then the expansion piece withdraws from the port of the pipe. When the utility model performs expansion processing on the pipe, an outward expansion force is applied to the inner wall of the pipe through the radial movement of the expansion piece. During the processing, there is no axial sliding friction between the expansion piece and the inner wall of the pipe, and the friction and wear caused to the surface of the expansion piece are small, thereby improving the service life of the expansion piece and reducing the requirements for the wear resistance of the expansion piece material; and when the pipe is expanded by the device, there is no need to perform oil spray lubrication operation, thereby reducing the complexity of the processing operation.
[0007] Preferably, the expansion member limiting component is provided with an expansion member restraining cavity, which is a cylindrical cavity. The expansion member includes a guide body and an inner support body. The guide body is arranged in the expansion member restraining cavity and can move radially along the expansion member restraining cavity.
[0008] Preferably, the expansion piece limiting component comprises an expansion piece limiting sleeve and a cover plate connected to one side of the expansion piece limiting sleeve, and the cover plate and the expansion piece limiting sleeve jointly define an expansion piece restraining cavity.
[0009] Preferably, a spring hole is provided on the expansion member, one end of the second spring is connected to the spring hole, and the other end of the second spring contacts the inner wall of the expansion member restraining cavity.
[0010] Preferably, the guide reset mechanism includes a guide column and a first spring, one end of the guide column is connected to the expansion member limiting sleeve, a guide hole is provided on the punch seat, the guide column is slidably connected in the guide hole, and the first spring is arranged between the punch seat and the expansion member limiting component.
[0011] Preferably, the expansion member array assembly consists of eight expansion members.
[0012] Preferably, a clamping die for clamping the pipe is also included.
[0013] The beneficial effects of the utility model are as follows: when the utility model performs expansion processing on the pipe, an outward expansion force is applied to the inner wall of the pipe through the radial movement of the expansion piece. During the processing, there is no axial sliding friction between the expansion piece and the inner wall of the pipe, and the friction and wear caused to the surface of the expansion piece are small, thereby improving the service life of the expansion piece and reducing the requirements for the wear resistance of the expansion piece material; and when the pipe is expanded by the device, there is no need to perform oil spray lubrication operation, thereby reducing the complexity of the processing operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural explosion diagram of the utility model.
[0015] Figure 2 It is a schematic diagram of the structure of the expansion component array assembly.
[0016] Figure 3 It is a cross-sectional view of the utility model.
[0017] Figure 4 It is a schematic diagram of the utility model when expanding the pipe.
[0018] In the figure: 1, punch seat, 2, inner support core rod, 3, first spring, 4, guide column, 5, expansion member limit sleeve, 6, second spring, 7, expansion member, 7-1, guide body, 7-2, inner support body, 7-3, spring hole, 8, cover plate, 9, clamping die, 10, pipe, 11, guide hole. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.
[0020] like Figures 1 to 4 As shown, a pipe expansion die comprises a punch seat 1, an expansion piece limiting component, and an expansion piece 7. An expansion piece array assembly is provided on the expansion piece limiting component, and the expansion piece array assembly is composed of a plurality of expansion pieces 7 arranged in a circular array. A second spring 6 is provided between the expansion piece 7 and the expansion piece limiting component; an inner support core rod 2 is provided on the punch seat 1, and a conical surface is provided on the inner support core rod 2. Each expansion piece 7 on the expansion piece array assembly is in contact with the conical surface on the inner support core rod 2; a guiding and resetting mechanism is provided between the punch seat 1 and the expansion piece limiting component.
[0021] The punch seat 1 is connected to a driving device, and the driving member drives the punch seat 1 to move along the axial direction of the inner support core rod 2. The driving member can be a hydraulic cylinder.
[0022] The inner support mandrel 2 extends into the center of the expansion member array assembly. When the inner support mandrel 2 moves in one direction, each expansion member 7 moves toward the radial outer side of the expansion member array assembly under the action of the conical surface on the inner mandrel. When the inner support mandrel 2 moves in the other direction, each expansion member 7 moves toward the center of the expansion member array assembly under the action of the second spring 6.
[0023] The expansion die for the pipe 10 also includes a clamping die 9 for clamping the pipe 10. The clamping die 9 is arranged opposite to the expansion member 7, and the pipe 10 to be processed is clamped and fixed by the clamping die 9.
[0024] like Figure 4 As shown, when the tube 10 is expanded, the tube 10 is first clamped and fixed by the clamping die 9, and one end of the tube 10 is facing the expansion piece 7; the punch seat 1 moves forward to make one end of the expansion piece 7 extend into the port of the tube 10, and make the expansion piece limiting component contact with one end of the tube 10, and then the inner support core rod 2 continues to move, and under the action of the conical surface on the inner core rod, each expansion piece 7 moves toward the radial outside of the expansion piece array assembly, so that the expansion piece array assembly expands as a whole, thereby expanding the end of the tube 10, so that the end of the tube 10 forms a flared structure; after the expansion is completed, the punch seat 1 retreats, and each expansion piece 7 moves toward the center direction of the expansion piece array assembly and resets under the action of the second spring 6, and then the expansion piece 7 withdraws from the port of the tube 10.
[0025] Specifically, an expansion member restraint cavity is provided on the expansion member limiting component, and the expansion member restraint cavity is a cylindrical cavity; the expansion member 7 is "L"-shaped as a whole, and the expansion member 7 includes a guide body 7-1 and an inner support body 7-2, and the guide body 7-1 is arranged in the expansion member restraint cavity and can move radially along the expansion member restraint cavity.
[0026] The expansion member limiting component includes an expansion member limiting sleeve 5 and a cover plate 8 connected to one side of the expansion member limiting sleeve 5, and the cover plate 8 and the expansion member limiting sleeve 5 together define an expansion member restraining cavity. The cover plate 8 is bolted to the expansion member limiting sleeve 5. The cover plate 8 is annular, and the hollow area in the center of the cover plate 8 is used for the inner support body 7-2 to pass through.
[0027] The expansion member 7 is provided with a spring hole 7-3, which is arranged at one end of the guide body 7-1 on the expansion member 7, one end of the second spring 6 is connected to the spring hole 7-3, and the other end of the second spring 6 contacts the inner wall of the expansion member constraint cavity. The second spring 6 is arranged along the radial direction of the expansion member constraint cavity.
[0028] In this embodiment, the expansion member array assembly is composed of eight expansion members 7 .
[0029] The guide reset mechanism includes a guide post 4 and a first spring 3. One end of the guide post 4 is connected to the expansion member limit sleeve 5. The punch seat 1 is provided with a guide hole 11. The guide post 4 is slidably connected in the guide hole 11. The first spring 3 is arranged between the punch seat 1 and the expansion member limit member. The first spring 3 is sleeved on the guide post 4, and the guide post 4 is parallel to the inner support core rod. The punch seat 1 and the expansion member limit member can move relative to each other along the axial direction of the guide post 4.
[0030] When the utility model performs expansion processing on the pipe 10, an outward expansion force is applied to the inner wall of the pipe 10 through the radial movement of the expansion piece 7. During the processing, there is no axial sliding friction between the expansion piece 7 and the inner wall of the pipe 10, and the friction and wear caused to the surface of the expansion piece 7 are small, thereby improving the service life of the expansion piece 7 and reducing the requirements for the wear resistance of the material of the expansion piece 7. Moreover, when the pipe 10 is expanded by the device, there is no need to perform oil spray lubrication operation, thereby reducing the complexity of the processing operation.
[0031] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.
Claims
1. A pipe expansion die, characterized in that: It includes a punch seat, an expansion piece limiting component, and an expansion piece. An expansion piece array assembly is provided on the expansion piece limiting component. The expansion piece array assembly is composed of a number of expansion pieces arranged in a circular array. A second spring is provided between the expansion piece and the expansion piece limiting component. An inner support core rod is provided on the punch seat. A conical surface is provided on the inner support core rod. Each expansion piece on the expansion piece array assembly is in contact with the conical surface on the inner support core rod. A guiding and resetting mechanism is provided between the punch seat and the expansion piece limiting component.
2. A pipe expansion die according to claim 1, characterized in that: The expansion member limiting component is provided with an expansion member restraining cavity, which is a cylindrical cavity. The expansion member includes a guide body and an inner support body. The guide body is arranged in the expansion member restraining cavity and can move radially along the expansion member restraining cavity.
3. A pipe expansion die according to claim 2, characterized in that: The expansion piece limiting component comprises an expansion piece limiting sleeve and a cover plate connected to one side of the expansion piece limiting sleeve, and the cover plate and the expansion piece limiting sleeve jointly define an expansion piece restraining cavity.
4. A pipe expansion die according to claim 2, characterized in that: The expansion piece is provided with a spring hole, one end of the second spring is connected to the spring hole, and the other end of the second spring contacts the inner wall of the expansion piece restraining cavity.
5. A pipe expansion die according to claim 3, characterized in that: The guide reset mechanism includes a guide column and a first spring. One end of the guide column is connected to the expansion member limiting sleeve. The punch seat is provided with a guide hole. The guide column is slidably connected in the guide hole. The first spring is arranged between the punch seat and the expansion member limiting component.
6. A pipe expansion die according to any one of claims 1 to 4, characterized in that: The expansion member array assembly is composed of eight expansion members.
7. A pipe expansion die according to any one of claims 1 to 4, characterized in that: Also included are clamping dies for clamping the tubing.