Hydraulic forming mechanism

Abstract

The hydraulic forming mechanism comprises a sealing cylinder and a sealing assembly, the sealing assembly comprises a protective sleeve and at least one water injection piece, the telescopic end of the sealing cylinder is in transmission connection with the water injection piece and can drive the water injection piece to move relative to the protective sleeve in the axial direction of the sealing cylinder, and the water injection piece is sleeved with a sealing ring. A limiting part is fixed to the end of the water injection piece, and the sealing ring is located between the sheath and the limiting part. According to the sealing assembly, after the whole sealing assembly moves towards the workpiece through the sealing cylinder, the water injection piece can be driven by the sealing cylinder to move away from the workpiece, so that the sealing ring is extruded, sealing of the sealing ring and the inner wall of the workpiece is achieved, the sealing effect is improved, and the undesirable phenomena of forming water leakage, material supplementing sinking and the like are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe hydraulic forming, and more particularly to a hydraulic forming mechanism. Background Art

[0002] With the continuous development of hydroforming technology and its application in automotive parts manufacturing, the hydroforming process for manufacturing automotive hot-end connectors and EGR square tubes not only allows for the formation of products with complex cross-sections, but also allows for continuous and variable cross-sections, adapting to the requirements for cross-sectional dimensions due to varying loads, improving forming precision, and meeting current automotive lightweighting requirements. Hydroforming utilizes the principle of metal plastic deformation to inject a high-pressure liquid medium into a sealed metal pipe blank. Simultaneously, specialized equipment applies axial extrusion pressure at both ends of the pipe, causing the blank to continuously deform plastically within a pre-designed mold cavity until the mold's inner surface conforms to the pipe's outer wall, resulting in a product that meets the design specifications. However, the hydroforming process is complex, involving water injection, sealing, pressurization, and pressure relief, resulting in long processing times, high equipment energy consumption, and low production efficiency. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to improve the sealing effect of hydraulic forming.

[0004] The utility model solves the above technical problems through the following technical means: a hydraulic forming mechanism, including a sealing cylinder and a sealing assembly, the sealing assembly including a sheath and at least one water injection piece, the telescopic end of the sealing cylinder is transmission-connected to the water injection piece, and can drive the water injection piece to move axially relative to the sheath, a sealing ring is provided on the water injection piece, a limiting portion is fixed to the end of the water injection piece, and the sealing ring is located between the sheath and the limiting portion.

[0005] By setting the sealing cylinder, after the entire sealing assembly moves toward the workpiece, the sealing cylinder can drive the water injection part to move away from the workpiece, thereby squeezing the sealing ring to achieve sealing between the sealing ring and the inner wall of the workpiece, thereby improving the sealing effect.

[0006] As a preferred technical solution, it further includes a hydraulic cylinder, the telescopic end of the hydraulic cylinder is transmission-connected to the sleeve, and the sealing cylinder is located inside the telescopic end of the hydraulic cylinder.

[0007] As a preferred technical solution, the sealing cylinder is connected to the water injection piece via a compression plate, and the compression plate is located inside the sheath.

[0008] As a preferred technical solution, the sheath includes a front sheath and a rear sheath, and the front sheath and the rear sheath are fixed together to form a closed cavity structure, and a gap is left between the inner wall of the cavity and the compression plate.

[0009] As a preferred technical solution, the limiting portion includes a locking nut, and the locking nut is threadedly fixed to the end of the water injection piece.

[0010] As a preferred technical solution, the water injection piece is further provided with a sealing head, and the sealing head is located between the sheath and the sealing ring.

[0011] As a preferred technical solution, a step adapted to the wall thickness of the workpiece is formed on the sealing head.

[0012] As a preferred technical solution, it also includes a guide base, which is slidably matched with the sheath, and two water injection parts are provided and arranged side by side.

[0013] As a preferred technical solution, the compression plate is provided with a bolt hole adapted to the telescopic end of the sealing cylinder.

[0014] As a preferred technical solution, the water injection member is a rod-shaped structure, and two water injection holes are opened on the water injection member, one of the water injection holes is connected to the hydraulic water injection pipe, and the other water injection hole is opened toward the workpiece.

[0015] The beneficial effects of the present invention are:

[0016] (1) In the present invention, after the entire sealing assembly moves toward the workpiece, the sealing cylinder can be used to drive the water injection part to move away from the workpiece, thereby squeezing the sealing ring to achieve sealing between the sealing ring and the inner wall of the workpiece, thereby improving the sealing effect and avoiding the occurrence of undesirable phenomena such as forming leakage and filling material depression.

[0017] (2) In the present invention, by arranging two or more water injection parts in a single sealing component, multiple workpieces can be hydraulically formed at the same time, thereby improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present utility model;

[0019] Figure 2 A schematic diagram of the explosion structure of the sealing assembly provided in an embodiment of the present utility model;

[0020] Figure 3 A schematic diagram of the gap structure between the compression plate and the sheath provided in an embodiment of the present utility model;

[0021] Figure numbers: 1. Hydraulic cylinder; 2. Sealing assembly; 21. Locking nut; 22. Polyurethane sealing ring; 23. Sealing head; 24. Water injection part; 25. Front sleeve; 26. Compression plate; 27. Rear sleeve; 3. Guide base; 4. Cylinder fixing bracket. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the utility model embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0023] Referring to Figure 1 A hydraulic forming mechanism comprises a hydraulic cylinder 1, a sealing assembly 2, a guide base 3, a cylinder fixing frame 4, a sealing cylinder arranged in the piston rod of the hydraulic cylinder 1, the sealing assembly 2 comprises a sheath, a compression plate 26 and a water injection part 24, the sheath is internally provided with a closed cavity structure, the compression plate 26 is located in the cavity, and the telescopic end of the sealing cylinder can drive the compression plate 26 to drive the water injection part 24 to move along the axial direction relative to the sheath. Figure 3 In the embodiment, the cavity width is 3-5 mm larger than the width of the compression plate 26, so as to leave space for the compression sealing ring 22, the hydraulic cylinder 1 is fixedly connected to the cylinder fixing frame 4, the telescopic end of the hydraulic cylinder 1 is fixedly connected to the sheath, the telescopic end of the sealing cylinder is fixedly connected to the water injection part 24 through the compression plate 26, the end, away from the compression plate 26, of the water injection part 24 is fixedly connected to a locking nut 21, a sealing head 23 and a sealing ring 22 are sleeved on the water injection part 24, the sealing head 23 and the sealing ring 22 are located between the sheath and the locking nut 21, the sheath is in sliding fit with the guide base 3, and the guide base 3 guides the sheath and reduces the radial load of the hydraulic cylinder 1.

[0024] Referring to Figure 2 The sheath comprises a front sheath 25 and a rear sheath 27, recesses are formed in the front sheath 25 and the rear sheath 27, the front sheath 25 and the rear sheath 27 are fastened through bolt connection, and the two recesses form the above-mentioned cavity; in the embodiment, the water injection part 24 is a hollow rod structure, threads are arranged at both ends of the water injection part 24, one end is threadedly connected to the compression plate 26 and connected to a hydraulic water injection pipe through the compression plate 26, and the other end is threadedly connected to the locking nut 21, and the sealing ring 22 is made of polyurethane.

[0025] Referring to Figure 2 In the embodiment, two water injection parts 24 are arranged, and of course, one, three, four or the like can also be arranged, which is not limited, a step with the same thickness as the wall thickness of the workpiece is arranged on the sealing head 23 for material compensation, and the workpiece is continuously given pressure in the bulging process.

[0026] Method for use:

[0027] During forming, the telescopic end of the hydraulic cylinder 1 drives the sealing assembly 2 to move toward the workpiece and partially enters the workpiece cavity. Water injection holes are provided in both sets of water injection parts 24. The hydraulic water injection pipe injects filling liquid into the cavities of the two workpieces through the water injection holes. When the workpiece is full of filling liquid, the telescopic end of the sealing cylinder drives the compression plate 26, the water injection part 24 and the locking nut 21 to move away from the workpiece. Since there is a gap between the sleeve and the compression plate 26, when the compression plate 26 and the inner wall of the rear sleeve 27 are against each other, the locking nut 21 and the sealing head 23 compress the sealing ring 22 to expand outward along its radial direction to fit tightly against the inner wall of the workpiece to form a seal. After the sealing is completed, the hydraulic water injection pipe starts to increase pressure, and the workpieces in the two cavities undergo plastic deformation at the same time until the outer wall of the pipe fits with the pre-designed mold cavity surface in the mold, completing the simultaneous bulging.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulic forming mechanism, characterized in that: It includes a sealing cylinder and a sealing assembly. The sealing assembly includes a sleeve and at least one water injection piece. The telescopic end of the sealing cylinder is transmission-connected to the water injection piece and can drive the water injection piece to move axially relative to the sleeve. A sealing ring is provided on the water injection piece. A limiting part is fixed at the end of the water injection piece. The sealing ring is located between the sleeve and the limiting part.

2. A hydraulic forming mechanism according to claim 1, characterized in that: It also includes a hydraulic oil cylinder, the telescopic end of the hydraulic oil cylinder is transmission-connected to the sleeve, and the sealing cylinder is located inside the telescopic end of the hydraulic oil cylinder.

3. A hydraulic forming mechanism according to claim 1, characterized in that: The sealing cylinder is connected to the water injection piece through a compression plate, and the compression plate is located in the sheath.

4. A hydraulic forming mechanism according to claim 3, characterized in that: The sheath comprises a front sheath and a rear sheath, which are fixed together to form a closed cavity structure, and a gap is left between the inner wall of the cavity and the compression plate.

5. A hydraulic forming mechanism according to claim 1, characterized in that: The limiting portion includes a locking nut, and the locking nut is threadedly fixed to the end of the water injection piece.

6. A hydraulic forming mechanism according to claim 1, characterized in that: The water injection piece is also sleeved with a sealing head, which is located between the sheath and the sealing ring.

7. A hydraulic forming mechanism according to claim 6, characterized in that: The sealing head is formed with a step adapted to the wall thickness of the workpiece.

8. The hydraulic forming mechanism according to claim 1, characterized in that: It also includes a guide base, which is slidably matched with the sheath. Two water injection parts are provided and are arranged side by side.

9. The hydraulic forming mechanism according to claim 3, characterized in that: The compression plate is provided with a bolt hole which is matched with the telescopic end of the sealing cylinder.

10. The hydraulic forming mechanism according to claim 1, characterized in that: The water injection piece is a rod-shaped structure, and two water injection holes are provided on the water injection piece. One of the water injection holes is connected to the hydraulic water injection pipe, and the other water injection hole is opened toward the workpiece.

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