Water expansion type oil press

Abstract

The utility model discloses a water expansion type oil press, and particularly relates to the technical field of oil presses, the water expansion type oil press comprises a top table and a base, the top table is located above the base, an oil hydraulic cylinder is arranged in the middle of the top table, the telescopic end of the oil hydraulic cylinder is connected with an upper pressing die, a working table is fixed at the top of the base, and a lower die is arranged at the top of the working table. A cavity is formed in the top of the lower mold, a plurality of water cavities are formed in the bottom of the cavity, a material ejecting plate is arranged on the inner wall of the cavity, water spraying assemblies are arranged on the two sides of the lower mold, each water spraying assembly comprises water spraying heads arranged on the two side walls of the lower mold, and water outlets of the water spraying heads are connected with chock plugs. The end part of the chock plug can extend into the cavity; according to the utility model, the ejector plate is arranged in the cavity of the lower die, and the ejector plate can move upwards under the action of water pressure and ejects a metal workpiece upwards, so that the unloading operation is automatically completed.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic presses, and particularly relates to a hydroforming hydraulic press. Background Art

[0002] A hydraulic press is an advanced hydraulic mechanical equipment that uses high-pressure water for metal material forming. A hydroforming hydraulic press is a machine that combines the pressing principle of a hydraulic press and high-pressure forming technology. The main use of this technology is that under a high-pressure sealed state, metal pipes are plastically extended and deformed from the inside out through internal high pressure, and finally are formed by closely adhering to the shape of the mold.

[0003] During the process of processing metal workpieces with the existing hydroforming hydraulic press, a hydraulic mold is placed on the top of the workbench, the metal workpiece is placed in the mold cavity on the top of the mold, and the metal workpiece is extruded by the hydraulic press platen. While the metal workpiece is being extruded, water is injected. The water pressure acts on the inside of the metal workpiece, and under the huge water pressure, the workpiece is expanded, thus completing a hydroforming process. However, after the workpiece is formed and the platen is separated from the mold, under the action of pressure, the workpiece is tightly pressed into the mold cavity, and when unloading, workers need to use tools to hook out the workpiece, and the demoulding of the workpiece is rather cumbersome. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a hydroforming hydraulic press to solve the above deficiencies in the technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A hydroforming hydraulic press includes a top table and a base. The top table is located above the base. An oil cylinder is arranged in the middle of the top table, and the telescopic end of the oil cylinder is connected with an upper pressing mold. A workbench is fixed on the top of the base, a lower mold is arranged on the top of the workbench, a cavity is opened on the top of the lower mold, several water cavities are opened at the bottom of the cavity, a top plate is arranged on the inner wall of the cavity, and spraying assemblies are arranged on both sides of the lower mold. The spraying assemblies include: spray heads arranged on both side walls of the lower mold, the water outlet of the spray head is connected with a plug, the end of the plug can extend into the cavity, and a water inlet pipe is arranged on the top of the spray head.

[0007] Preferably, several pipe plugs are arranged at the bottom of the top plate, and the pipe plugs correspond to the water cavities.

[0008] Preferably, two movable rods are symmetrically arranged at the bottom of the top plate, and two movable grooves matched with the movable rods are also symmetrically opened at the top of the cavity.

[0009] Preferably, a first valve is connected to the end of the water inlet pipe. A fixing column is arranged on one side of the water spray head, and a telescopic member is fixed to the top of the fixing column. The telescopic member is used to push or pull the water spray head.

[0010] Preferably, an arc-shaped groove identical to the cavity is further formed at the bottom of the upper pressing die, and an arc-shaped plate with the same structure as the ejector plate is fixed in the arc-shaped groove.

[0011] Preferably, the water cavity extends to the rear surface of the lower die, and a connecting pipe is arranged at the port of the water cavity. A diversion pipe is connected to the end of the connecting pipe, an extension pipe is connected to the end of the diversion pipe, and a second valve is arranged on the extension pipe.

[0012] Preferably, support columns are arranged between the top platform and the base.

[0013] In the above technical solution, the technical effects and advantages provided by the present utility model are as follows:

[0014] 1. By arranging an ejector plate in the cavity of the lower die, under the action of water pressure, the ejector plate can move upward and jack up the metal workpiece, thereby automatically completing the unloading operation. After the metal workpiece is jacked up, it is in a loose state, and the metal workpiece can be removed from the top of the lower die by manually holding a rod tool. The outer wall and inner wall of the metal workpiece will not be scratched during the material taking process, ensuring the surface quality of the metal workpiece.

[0015] 2. By arranging a water cavity inside the lower die, a connecting pipe and a diversion pipe are connected to the end of the water cavity, and an external hydraulic system is connected to the diversion pipe. High-pressure water flow is injected into the lower die through the diversion pipe and the connecting pipe, so that the ejector plate moves upward and ejects the metal workpiece. It is beneficial to drive the ejector plate by water pressure, and there is no need for a traditional mechanical mechanism as the ejection structure, making the structure of the lower die simpler and more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the lower die and the workbench of the present utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the upper pressing die and the lower die of the present utility model;

[0020] Figure 4 This is an exploded view of the lower die of the present utility model;

[0021] Figure 5 This is a schematic diagram of the internal structure of the lower die of the present utility model;

[0022] Figure 6 This is a three-dimensional view of the ejector plate of the present utility model;

[0023] Figure 7 is Figure 2 the enlarged view of part A in

[0024] Explanation of reference numerals:

[0025] 1. Top platform; 2. Hydraulic cylinder; 3. Support column; 4. Lower die; 41. Cavity; 5. Fixed column; 6. Base; 7. Workbench; 8. Sprinkler head; 9. Water inlet pipe; 10. First valve; 11. Upper pressing die; 12. Telescopic member; 13. Diversion pipe; 14. Second valve; 15. Connecting pipe; 16. Ejector plate; 17. Movable groove; 18. Water cavity; 19. Blocked pipe; 20. Movable rod; 21. Plug. Detailed implementation manners

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further introduced in detail below in conjunction with the accompanying drawings.

[0027] The present utility model provides a hydro-expansion type hydraulic press as shown in Figures 1 - 7 , which includes a top platform 1 and a base 6. The top platform 1 is located above the base 6. A hydraulic cylinder 2 is provided in the middle of the top platform 1. The telescopic end of the hydraulic cylinder 2 is connected to an upper pressing die 11. A workbench 7 is fixed on the top of the base 6. A lower die 4 is provided on the top of the workbench 7. A cavity 41 is opened at the top of the lower die '4. A plurality of water cavities 18 are opened at the bottom of the cavity 41. An ejector plate 16 is provided on the inner wall of the cavity 41. Spraying assemblies are provided on both sides of the lower die 4. The spraying assemblies include: sprinkler heads 8 provided on both side walls of the lower die 4. The water outlet of the sprinkler head 8 is connected to a plug 21. The end of the plug 21 can extend into the cavity 41. A water inlet pipe 9 is provided on the top of the sprinkler head 8; Specifically, during the process of processing a metal workpiece, first, the metal workpiece (metal pipe, hereinafter the metal workpiece is the same as the metal pipe or metal tubular workpiece) is placed on the ejector plate 16. The two ends of the metal pipe are matched with the plug 21. The plug 21 seals the inside of the metal pipe. At the same time, the hydraulic cylinder 2 pushes the upper pressing die 11 downward. The upper pressing die 11 fits downward with the top of the lower die 4. After being pressurized by an external hydraulic system, the inside of the metal pipe is expanded by water pressure, and the diameter of the metal pipe is enlarged.

[0028] As shown in Figures 1 - 7As shown, specifically, a plurality of blocking tubes 19 are provided at the bottom of the ejection plate 16, and the blocking tubes 19 correspond to the water cavity 18; two movable rods 20 are symmetrically provided at the bottom of the ejection plate 16, and two movable grooves 17 cooperating with the movable rods 20 are symmetrically provided at the top of the cavity 41; specifically, after the water flow is ejected from the water cavity 18, the ejection plate 16 is lifted up, and at the same time, the blocking tubes 19 move upward with the ejection plate 16, and the movable rods 20 also move upward with it, and the movable rods 20 have a guiding function;

[0029] It should be noted that during the demolding process, a distance is maintained between the upper die 11 and the lower die 4, and the distance is less than the length of the movable rod 20, so as to prevent the ejection plate 16 from being completely separated from the cavity 41. During the process of the ejection plate 16 being lifted up, the metal tubular workpiece is also lifted up and naturally separated from the cavity 41. The upper die 11 moves upward, and the user uses a lever-like tool to move the demolded metal tubular workpiece, thereby removing the metal tubular workpiece. During this process, the ejection plate 16 will not be separated, and the next metal tubular workpiece is placed on the ejection plate 16, thereby pressing the ejection plate 16 down back to its original position, so that the ejection plate 16 can be reused.

[0030] like Figures 1 - 7 As shown, a first valve 10 is connected to the end of the water inlet pipe 9, and a fixed column 5 is provided on one side of the water spray head 8. A telescopic member 12 is fixed to the top of the fixed column 5, and the telescopic member 12 is used to push or pull the water spray head 8; specifically, the first valve 10 is connected to the external hydraulic system, and pressure is supplied by the external hydraulic system. The water flows through the first valve 10 and the water inlet pipe 9, and then enters the water spray head 8, placing the metal tubular workpiece above the ejection plate 16, and pushing the water spray head 8 close to the lower mold 4 through the telescopic member 12. While the water spray head 8 moves, it pushes the plug 21 to move into the groove at the end of the ejection plate 16. The water sprayed by the water spray head 8 is sprayed out from the central space of the plug 21. The plug 21 is located in the ejection plate 16 and is in a suspended state, so that the end of the metal tubular workpiece can be inserted into the plug 21, so that the metal tubular workpiece is a closed space, thereby completing the water swelling process.

[0031] like Figures 1 - 3 As shown, the bottom of the upper die 11 is also provided with an arc-shaped groove identical to the cavity 41 , and an arc-shaped plate having the same structure as the ejector plate 16 is fixed in the arc-shaped groove.

[0032] Specifically, during the pressing process of the upper die 11, the arc plate ( Figure 3As shown (not labeled), it forms a tubular structure with the ejector plate 16 in the cavity 41, preventing the radius of the metal tubular workpiece in the cavity 41 from being smaller than the radius of the tubular structure formed by the arc plate and the ejector plate 16. Therefore, when a high pressure is applied inside the metal tubular workpiece, the metal tubular workpiece undergoes deformation by hydroforming. The outer wall of the metal tubular workpiece fits against the inner wall of the tubular structure formed by the arc plate and the ejector plate 16, thereby expanding the diameter and achieving the purpose of hydroforming processing.

[0033] Specifically, in this embodiment, as Figures 3 - 5 shown, the water cavity 18 extends to the rear surface of the lower mold 4, and a connecting pipe 15 is provided at the port of the water cavity 18. One end of the connecting pipe 15 is connected to a diversion pipe 13, and one end of the diversion pipe 13 is connected to an extension pipe. A second valve 14 is provided on the extension pipe;

[0034] Furthermore, in order to make the connection between the connecting pipe 15 and the lower mold 4 more firm, a plurality of sealing rings can be provided at the end of the connecting pipe 15. The sealing rings are fixed outside the connecting pipe 15 and follow one end of the connecting pipe 15 inserted into the water cavity 18 (not shown in the figure). It should be noted that the water supply pipe of the external hydraulic system is connected to the second valve 14. Water flow is provided by the external hydraulic system into the extension pipe, passes through the diversion pipe 13 and the connecting pipe 15, then enters the water cavity 18, and finally sprays out from the port of the water cavity 18 and sprays out at the inner side position of the cavity 41. At this time, when the ejector plate 16 fits against the inner wall of the cavity 41, the ejector plate 16 is lifted by the water pressure, and a metal workpiece is placed inside the ejector plate 16. Here, the metal workpiece generally refers to a metal tubular workpiece. The ejector plate 16 and the metal tubular workpiece are lifted simultaneously, thereby completing the demolding.

[0035] As Figure 1 shown, support columns 3 are provided between the top table 1 and the base 6. Specifically, the support columns 3 support the top table 1, and the positions between the top table 1 and the base 6 are fixed. The space between the top table 1 and the base 6 is the moving space for the upper die 11 and the lower mold 4.

[0036] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A water-expanding type hydraulic press, comprising a top table (1) and a base (6), the top table (1) is located above the base (6), an oil cylinder (2) is arranged in the middle of the top table (1), a telescopic end of the oil cylinder (2) is connected with an upper pressing die (11), a workbench (7) is fixed on the top of the base (6), and it is characterized in that: A lower mold (4) is arranged on the top of the workbench (7). A cavity (41) is formed in the top of the lower mold (4). A plurality of water cavities (18) are formed in the bottom of the cavity (41). A knockout plate (16) is arranged on the inner wall of the cavity (41). Spraying assemblies are arranged on both sides of the lower mold (4). The spraying assemblies include: spraying heads (8) arranged on both side walls of the lower mold (4). A plug (21) is connected to the water outlet of the spraying head (8). The end of the plug (21) can extend into the cavity (41). A water inlet pipe (9) is arranged on the top of the spraying head (8).

2. The hydro-expansion type hydraulic press according to claim 1, characterized in that: A plurality of pipe plugs (19) are arranged on the bottom of the knockout plate (16). The pipe plugs (19) correspond to the water cavities (18).

3. The hydro-expansion type hydraulic press according to claim 2, characterized in that: Two movable rods (20) are symmetrically arranged on the bottom of the knockout plate (16). Two movable grooves (17) which are matched with the movable rods (20) are symmetrically formed in the top of the cavity (41).

4. A water-expanding type hydraulic press according to claim 1, characterized in that: A first valve (10) is connected to the end of the water inlet pipe (9). A fixing column (5) is arranged on one side of the spraying head (8). A telescopic member (12) is fixed to the top end of the fixing column (5). The telescopic member (12) is used to push or pull the spraying head (8).

5. The hydro-expansion type hydraulic press according to claim 1, characterized in that: An arc-shaped groove same as the cavity (41) is further formed in the bottom of the upper pressing mold (11). An arc-shaped plate with the same structure as the knockout plate (16) is fixed in the arc-shaped groove.

6. The hydro-expansion type hydraulic press according to claim 1, wherein: The water cavity (18) extends to the rear surface of the lower mold (4). A connecting pipe (15) is arranged at the port of the water cavity (18). A guide pipe (13) is connected to the end of the connecting pipe (15). An extension pipe is connected to the end of the guide pipe (13). A second valve (14) is arranged on the extension pipe.

7. The hydro-expansion type hydraulic press according to claim 1, wherein: Support columns (3) are arranged between the top platform (1) and the base (6).

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