A variable-diameter stainless steel pipe water expansion forming device

Abstract

The utility model provides a variable diameter stainless steel pipe water rises forming device, including frame and cavity module, the base mould frame is installed on the frame upper end through bolt, the vertical board is welded to the frame upper end rear side, the vertical board inside upper end longitudinal installation has the hydraulic pressure rod, the hydraulic pressure rod movable end installs the connecting plate, the connecting plate lower end is installed with the mounting seat through bolt, this design has solved the original stainless steel pipe water rises forming die for integral type die structure, only adapts to one kind of variable diameter specification, when replacing the product of different diameter or taper, needs integral dismounting die, and each kind of specification needs the die of separate customization (cost increases 50%) problem, the utility model comprises base mould frame and replaceable cavity module, the cavity module is connected with the base mould frame through the bolt and the magnetic adsorption clamping structure, does not need integral dismounting die, makes its replacement efficiency effectively improves, adapts to multi -specification production, in addition shares the base mould frame, makes die integral cost effectively reduces.

Description

Technical Field

[0001] This utility model is a water-expanding forming device for variable diameter stainless steel pipes, belonging to the field of stainless steel pipe production technology. Background Technology

[0002] Reducing-diameter stainless steel pipes (such as tapered pipes and stepped pipes with different diameters at both ends) are widely used in water supply and drainage engineering, automotive fuel systems, medical devices, and other fields due to their high strength and good corrosion resistance. Water-expanding forming technology applies high-pressure water (typically 100-500MPa) to the inside of the pipe blank, causing it to plastically deform within a mold and conform to the mold cavity to form the desired reducing-diameter structure. This technology offers advantages such as high forming accuracy (dimensional deviation ≤ ±0.1mm) and no surface damage (roughness Ra ≤ 1.6μm). While existing water-expanding forming equipment can achieve basic reducing-diameter forming, it has limitations in mold versatility, forming uniformity, and operational efficiency.

[0003] Chinese patent CN218692996U proposes a stainless steel pipe water-expansion forming mold. By activating a vacuum generator, negative pressure is created in the mold cavity, altering the stress state of the stainless steel pipe within the cavity and eliminating adverse forces during deformation. This allows the stainless steel pipe to deform into the desired shape, resulting in a better fit between the pipe and the cavity, leading to a fuller appearance and satisfactory dimensional accuracy. However, this stainless steel pipe water-expansion forming mold is an integral mold structure, only suitable for one diameter specification. When changing to products with different diameters or tapers, the entire mold must be disassembled, and each specification requires a separately customized mold (increasing costs by 50%). This makes it unsuitable for small-batch, multi-variety production. There is an urgent need for a variable-diameter stainless steel pipe water-expansion forming device to solve the aforementioned problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a variable diameter stainless steel pipe hydroforming device to solve the problems mentioned in the background. This invention consists of a basic mold frame and a replaceable cavity module. The cavity module is connected to the basic mold frame through a pin and magnetic adsorption locking structure, eliminating the need for complete mold disassembly, thus effectively improving replacement efficiency and adapting to multi-specification production. In addition, the shared basic mold frame effectively reduces the overall cost of the mold.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a variable diameter stainless steel pipe hydraulic expansion forming device, comprising a frame and cavity modules. A base mold frame is bolted to the upper end of the frame. A vertical plate is welded to the rear side of the upper end of the frame. A hydraulic rod is longitudinally installed at the upper end of the vertical plate. A connecting plate is installed at the movable end of the hydraulic rod. A mounting seat is bolted to the lower end of the connecting plate. An upper mold base is bolted to the lower end of the mounting seat. Module slots are formed in the middle of the upper end of the base mold frame and the middle of the lower end of the upper mold base. Rectangular slots are formed around the lower end of the upper mold base and around the upper end of the base mold frame. Two cavity modules are provided. Rectangular blocks are welded around the cavity module, and multiple rectangular blocks are respectively inserted into multiple rectangular slots. Multiple positioning slots are opened on the surface of each of the two cavity modules. Variable diameter cavities are opened on the opposite inner end faces of each of the two cavity modules. Multiple pin slots are opened at the connection points between the multiple rectangular blocks and the multiple rectangular slots. Pins are inserted into the multiple pin slots. Each pair of opposite pins is connected by a connecting shaft. Torsion springs are installed on the outside of the multiple connecting shafts. Outer cylinders are installed on the outside of the multiple torsion springs. First magnetic blocks are horizontally fixed on the inner side of the multiple outer cylinders. Second magnetic blocks are fixed to the front and rear ends of the upper mold base and the front and rear ends of the base mold frame with epoxy resin.

[0006] Furthermore, a water collection trough is provided at the upper end of the frame, and a drain pipe is installed through the left front end of the water collection trough.

[0007] Furthermore, two sets of embedded magnets are respectively embedded in the inner end faces of the two cavity modules.

[0008] Furthermore, multiple positioning posts are welded to both the upper end of the basic mold frame and the lower end of the upper mold base, and the multiple positioning posts are respectively inserted into multiple positioning slots.

[0009] Furthermore, the plurality of first magnetic blocks are respectively fixed to the plurality of second magnetic blocks by magnetic engagement.

[0010] Furthermore, the outer surfaces of multiple outer cylinders are provided with anti-slip textures.

[0011] The beneficial effects of this utility model are as follows: This utility model provides a variable diameter stainless steel pipe water expansion forming device. Because this utility model adds a vertical plate, hydraulic rod, connecting plate, mounting base, upper mold base, basic mold frame, rectangular block, positioning column, embedded magnet piece, pin, connecting shaft, outer cylinder, torsion spring, first magnet clip and second magnet clip, the structure is reasonable. It consists of a basic mold frame (high strength cast iron, fixed to the machine frame) and replaceable cavity modules (Cr12 mold steel, surface hardened to HRC55). The cavity modules are connected to the basic mold frame through pins and magnetic adsorption locking structure. The replacement time is <10 minutes, the replacement efficiency is high, and it is suitable for multi-specification production. In addition, the shared basic mold frame effectively reduces the overall cost of the mold and has strong practicality. Attached Figure Description

[0012] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the structure of a variable diameter stainless steel pipe water expansion forming device according to the present invention.

[0014] Figure 2 This is a schematic diagram of the working structure of a variable diameter stainless steel pipe water expansion forming device according to this utility model.

[0015] Figure 3 This is an enlarged structural diagram of the variable diameter cavity of a variable diameter stainless steel pipe hydroforming device according to this utility model.

[0016] Figure 4 This is a schematic diagram of the first magnetic block structure of a variable diameter stainless steel pipe hydroforming device according to the present invention.

[0017] In the diagram: 1-Frame, 2-Water collection tank, 3-Drainage pipe, 4-Upright plate, 5-Hydraulic rod, 6-Connecting plate, 7-Mounting base, 8-Upper mold base, 9-Basic mold frame, 10-Module slot, 11-Rectangular slot, 111-Rectangular block, 12-Cavity module, 13-Positioning slot, 14-Positioning column, 15-Variable diameter cavity, 16-Embedded magnet piece, 17-Pin slot, 18-Pin, 19-Connecting shaft, 20-Outer cylinder, 21-Torsion spring, 22-First magnet block, 23-Second magnet block. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] Please see Figures 1-4This utility model provides a technical solution: a variable diameter stainless steel pipe water expansion forming device, including a frame 1 and cavity modules 12. A base mold frame 9 is bolted to the upper end of the frame 1. A vertical plate 4 is welded to the rear side of the upper end of the frame 1. A hydraulic rod 5 is longitudinally installed at the upper end of the vertical plate 4. A connecting plate 6 is installed at the movable end of the hydraulic rod 5. A mounting seat 7 is bolted to the lower end of the connecting plate 6. An upper mold seat 8 is bolted to the lower end of the mounting seat 7. Module slots 10 are opened in the middle of the upper end of the base mold frame 9 and the middle of the lower end of the upper mold seat 8. Rectangular slots 11 are opened around the lower end of the upper mold seat 8 and around the upper end of the base mold frame 9. Two cavity modules 12 are provided. Rectangular blocks 111 are welded around the perimeter of each cavity module 12. Multiple rectangular blocks 111 are respectively inserted into multiple rectangular slots 11. Multiple rectangular blocks 111 are opened on the surface of each cavity module 12. Each positioning groove 13, two cavity modules 12 have variable diameter cavities 15 on their inner end faces, multiple rectangular blocks 111 and multiple rectangular grooves 11 are connected by multiple pin slots 17, and pins 18 are inserted into each pin slot 17. Each pair of opposite pins 18 are connected by a connecting shaft 19. Torsion springs 21 are installed on the outside of each connecting shaft 19, and outer cylinders 20 are installed on the outside of each torsion spring 21. First magnetic blocks 22 are horizontally fixed on the inside of each outer cylinder 20. Second magnetic blocks 23 are fixed to the front and rear ends of the upper mold base 8 and the front and rear ends of the base mold frame 9 with epoxy resin. This design solves the problem that the original stainless steel pipe water expansion forming mold is an integral mold structure, which is only suitable for one variable diameter specification. When changing to products with different diameters or tapers, the mold needs to be completely disassembled, and each specification needs to be customized separately.

[0020] As the first embodiment of this utility model: a water collection tank 2 is provided at the upper end of the frame 1, and a drain pipe 3 is installed through the left side of the front end of the water collection tank 2. The added water collection tank 2 facilitates the collection of water leaking out of the variable diameter stainless steel pipe after it has been water-expanded and formed. Two sets of embedded magnet pieces 16 are respectively embedded in the inner end faces of the two cavity modules 12. When the two cavity modules 12 are combined together, the two sets of embedded magnet pieces 16 will attract each other, thereby ensuring the initial connection of the two cavity modules 12.

[0021] Multiple positioning posts 14 are welded to the upper end of the base mold frame 9 and the lower end of the upper mold base 8. These positioning posts 14 are respectively engaged in multiple positioning slots 13. The addition of these positioning posts 14 ensures the accurate installation of the two cavity modules 12 on the upper end of the base mold frame 9 and the lower end of the upper mold base 8. Multiple first magnetic locking blocks 22 are magnetically engaged with multiple second magnetic locking blocks 23. This magnetic engagement prevents the multiple outer cylinders 20 from loosening with the multiple connecting shafts 19, ensuring the stability of the insertion of the multiple pins 18. The outer surfaces of the multiple outer cylinders 20 are provided with anti-slip textures. When the multiple outer cylinders 20 are twisted, the multiple first magnetic locking blocks 22 are forced to separate from the multiple second magnetic locking blocks 23.

[0022] As a second embodiment of this utility model: First, according to the requirements of the variable diameter stainless steel pipe, a suitable cavity module 12 is selected. Then, two cavity modules 12 are respectively installed at the lower end of the upper mold base 8 and the upper end of the basic mold frame 9, forcing multiple rectangular blocks 111 to be inserted into multiple rectangular slots 11, and multiple positioning pins 14 to be inserted into multiple positioning slots 13. Next, multiple pins 18 are inserted into multiple pin slots 17, and multiple outer cylinders 20 are swung at the same time, and multiple torsion springs 21 are slightly compressed, so that multiple first magnetic locking blocks 22 are respectively engaged with second magnetic locking blocks 23, and after being magnetically attracted together, they can be used for... In operation, a stainless steel tube with a suitable diameter is placed into the lower diameter-changing cavity 15. The movable end of the hydraulic rod 5 is controlled to move down until the two sets of embedded magnet pieces 16 are attracted together. The two cavity modules 12 will be tightly attached together. Finally, two external punching rods are used to insert the matching external punches into the left and right sides of the diameter-changing cavity 15 respectively, which can force the stainless steel tube to deform. At the same time, high-pressure water is introduced through an external high-pressure pump, which forces the water pressure inside the stainless steel tube to perform water expansion forming operation (Note: Water expansion of stainless steel tube is a known technology and is not a necessary technology for this utility model. Its detailed working principle is not described in detail).

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A variable diameter stainless steel pipe hydroforming device, comprising a frame (1) and a cavity module (12), characterized in that: The upper end of the frame (1) is bolted with a base mold frame (9). A vertical plate (4) is welded to the rear side of the upper end of the frame (1). A hydraulic rod (5) is longitudinally installed inside the upper end of the vertical plate (4). A connecting plate (6) is installed at the movable end of the hydraulic rod (5). A mounting seat (7) is bolted to the lower end of the connecting plate (6). An upper mold seat (8) is bolted to the lower end of the mounting seat (7). A module slot (10) is opened in the middle of the upper end of the base mold frame (9) and the middle of the lower end of the upper mold seat (8). A rectangular slot (11) is opened around the lower end of the upper mold seat (8) and around the upper end of the base mold frame (9). There are two cavity modules (12). A rectangular block (111) is welded around the two cavity modules (12). The rectangular blocks (111) are respectively inserted into the rectangular slots. 11) Inside, multiple positioning grooves (13) are provided on the surface of the two cavity modules (12), and variable diameter cavities (15) are provided on the inner end faces of the two cavity modules (12). Multiple pin slots (17) are provided at the connection between the multiple rectangular blocks (111) and the multiple rectangular grooves (11). Pins (18) are inserted into the multiple pin slots (17). Each pair of opposite pins (18) are connected by a connecting shaft (19). Torsion springs (21) are installed on the outside of the multiple connecting shafts (19). Outer cylinders (20) are installed on the outside of the multiple torsion springs (21). First magnetic blocks (22) are horizontally fixed on the inner side of the multiple outer cylinders (20). Second magnetic blocks (23) are fixed on the front and rear ends of the upper mold base (8) and the front and rear ends of the base mold frame (9) by epoxy resin.

2. A variable diameter stainless steel tube hydro-forming apparatus as defined in claim 1, wherein: A water collection trough (2) is provided at the upper end of the frame (1), and a drain pipe (3) is installed through the left side of the front end of the water collection trough (2).

3. The variable diameter stainless steel pipe hydroforming device according to claim 1, characterized in that: Two sets of embedded magnet pieces (16) are respectively embedded in the inner end faces of the two cavity modules (12).

4. The variable diameter stainless steel pipe hydroforming device according to claim 1, characterized in that: The upper end of the basic mold frame (9) and the lower end of the upper mold base (8) are each welded with a plurality of positioning posts (14), and the plurality of positioning posts (14) are respectively inserted into a plurality of positioning slots (13).

5. The variable diameter stainless steel pipe hydroforming device according to claim 1, characterized in that: Multiple first magnetic clips (22) are respectively fixed to multiple second magnetic clips (23) by magnetic engagement.

6. The variable diameter stainless steel pipe hydroforming device according to claim 1, characterized in that: The outer surfaces of all the outer cylinders (20) are provided with anti-slip textures.

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