CN111570601A

CN111570601A - Thin plate box body hydraulic forming equipment and method

Info

Publication number: CN111570601A
Application number: CN202010418417.5A
Authority: CN
Inventors: 郭初生; 邵立伟; 郭益源; 任月慧
Original assignee: Zhongshan Research Institute Beijing Institute Of Technology; Guangdong Zhicheng Electrohydraulic Technology Co ltd
Current assignee: Zhongshan Research Institute Beijing Institute Of Technology; Guangdong Zhicheng Electrohydraulic Technology Co ltd
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2020-08-25

Abstract

The application relates to a thin plate box body hydraulic forming device and a method, the thin plate box body hydraulic forming device comprises: the clamping piece is used for clamping the thin plate to be formed; the body pushes down, including pushing down terminal surface and fluid runner, the terminal surface of pushing down is equipped with the fluid opening the terminal surface of the body of pushing down contradict in behind the sheet metal, fluid warp fluid runner and fluid opening get into the terminal surface of pushing down with in the cavity of sheet metal formation with the extrusion the sheet metal makes the sheet metal laminate in the inner wall extension shaping of mould. According to the thin plate box body hydraulic forming equipment and the thin plate box body hydraulic forming method, the thin plate to be formed is clamped by the clamping piece, then the pressing body is abutted to the thin plate, oil can enter the pressing end face of the pressing body and the containing cavity formed by the thin plate through the oil flow channel and the oil opening, and the thin plate is extruded to be attached to the inner wall of the die to be extended and formed, so that the thin plate metal forming processing can be conveniently and quickly realized.

Description

Thin plate box body hydraulic forming equipment and method

Technical Field

The invention relates to the field of hydraulic forming, in particular to a hydraulic forming device and method for a thin plate box.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The sheet metal forming method includes various drawing, stamping, spinning, forging and pressing, and is mainly suitable for regular axial symmetry shapes such as cylinders and open-type cones. However, the complexity and difficulty of the metal box forming process are greatly different due to different length-diameter ratios, thicknesses and shapes, but most of the metal box forming processes cannot be applied to irregular box forming, such as a barrel oil tank with a bottle-shaped neck and a square oil tank with a neck; or a plurality of processes are mixed and used and the finished product can be finished by welding, so that the process difficulty and the cost are high.

Disclosure of Invention

In view of the above, there is a need for a method and apparatus for hydroforming a thin plate box that can easily form a thin plate shaped box.

A sheet box hydroforming apparatus for stretching a sheet along an inner wall of a die, comprising:

the clamping piece is used for clamping the thin plate to be formed;

the body pushes down, including pushing down terminal surface and fluid runner, the terminal surface of pushing down is equipped with the fluid opening, the fluid runner with the fluid opening is connected the terminal surface of the body of pushing down contradict in behind the sheet metal, fluid warp fluid runner and fluid opening get into push down the terminal surface with in the cavity that the sheet metal formed with the extrusion the sheet metal makes the sheet metal laminate in the inner wall extension shaping of mould.

Preferably, the clamping member comprises a lower support plate and an upper pressing plate, the lower support plate is used for bearing the thin plate, and the upper pressing plate covers the thin plate to clamp the thin plate with the lower support plate.

Preferably, the lower support plate is provided with a lower through hole, and the side wall of the lower through hole is used for connecting the mold.

Preferably, the upper pressure plate is provided with an upper through hole, and when the upper pressure plate and the lower pressure plate clamp the thin plate, the lower through hole is communicated with the lower through hole, and when oil enters a cavity formed by the lower pressure end face and the thin plate through the oil flow passage and the oil opening to extrude the thin plate, the thin plate moves towards the center direction of the lower through hole along the radial direction.

Preferably, the lower pressing body extends into the upper through hole, and the lower pressing end face abuts against the thin plate, so that an oil sealing ring is formed between the edge of the lower pressing end face and the thin plate.

Preferably, the pressing end face is provided with a recessed area recessed towards the inner side, and the oil liquid opening is located in the recessed area.

Preferably, the lower support plate is located above the mold, and the lower pressing body is abutted against the mold through the thin plate in a vertical direction from above the thin plate.

Preferably, the oil flow passage is provided in the lower pressure body and extends in a length direction of the lower pressure body.

A method of hydroforming a sheet box, comprising:

the lower pressing body is abutted against the thin plate;

fluid flows into the interior fluid runner of the lower pressure body, and the fluid opening of the end face of pushing down through the lower pressure body flows into the end face of pushing down with in the cavity that the sheet metal formed in order to extrude the sheet metal makes the sheet metal laminating in the inner wall extension shaping of mould.

Preferably, when the lower pressing body is kept still, the oil liquid flows into a cavity formed by the lower pressing end face and the thin plate through the oil liquid opening so as to press the thin plate to be attached to the inner wall of the mold for extension, and air in the mold is exhausted through an exhaust hole of the mold.

Compared with the prior art, the thin plate box body hydraulic forming equipment and the thin plate box body hydraulic forming method have the advantages that the oil liquid flow channel and the oil liquid opening are arranged in the lower pressing body, the thin plate to be formed is clamped through the clamping piece, then the lower pressing body is abutted to the thin plate, so that oil liquid can enter the lower pressing end face of the lower pressing body and the containing cavity formed by the thin plate through the oil liquid flow channel and the oil liquid opening, the thin plate is extruded to be attached to the inner wall of the die to be formed in an extending mode, and therefore thin plate metal forming processing can be achieved conveniently and rapidly.

The thin-plate box body hydraulic forming equipment and the thin-plate box body hydraulic forming method are suitable for regular box body forming structures, particularly irregular box body forming occasions, and irregular box body forming machining can be achieved by arranging the inner wall shape mechanism of the die.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a hydraulic molding apparatus for a sheet box.

FIG. 2 is a schematic sectional view taken at II-II in FIG. 1.

Description of the main elements

Upper pressure plate	10
		Sheet metal	20
Cavity body	21
		Die set	30
Pressing body	40
		Oil fluid flow passage	41
Pressing end face	42
		Oil liquid opening	421
Lower support plate 50	50

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In various embodiments of the present invention, for convenience in description and not in limitation, the term "coupled" as used in the specification and claims of the present application is not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

The sheet 20 box hydroforming device is used for extending and forming the sheet 20 along the inner wall of the mold 30, so that the sheet 20 can be formed into a container with the structure of the inner wall of the mold 30, and the device is suitable for forming the container with the sheet 20 in a common shape structure, and is particularly suitable for forming the container with a special-shaped structure, such as a containing cavity with a neck structure. Among them, the thin plate 20 is preferably a thin metal plate 20 having high ductility.

Fig. 1 is a schematic structural view of a box hydroforming apparatus for a thin plate 20, and fig. 2 is a schematic structural view of a cross section taken along line II-II in fig. 1. As shown in fig. 1 and 2, the sheet 20 box hydroforming apparatus includes clamps and hold-down members to press form the sheet 20 in the die 30.

The clamping piece is used for clamping the thin plate 20 to be formed and comprises a lower support plate 50 and an upper pressing plate 10. In this embodiment, one side surface (e.g., the upper side surface shown in fig. 1 and 2) of the lower support plate 50 is a horizontal surface for supporting the thin plate 20. A lower through hole penetrating through the upper and lower side surfaces of the lower support plate 50 is formed in the lower support plate 50, and the end of the mold 30 is embedded in the lower through hole, that is, the end of the mold 30 is connected to the side wall of the lower through hole. The side of the upper press plate 10 facing the lower support plate 50 is a horizontal plane, and the upper press plate 10 covers the thin plate 20 on the lower support plate 50. In use, a compressive force F2 can be applied to the upper platen 10 toward the lower support plate 50 to clamp the sheet 20. In the present embodiment, the upper platen 10 has a substantially flat plate shape and has an upper through hole penetrating through upper and lower side surfaces thereof, the upper through hole being aligned with the lower through hole of the lower platen 50 and the thin platen 20 being located therebetween when the thin platen 20 is clamped. When oil enters the cavity 21 formed by the lower pressing end face 42 and the thin plate 20 through the oil flow passage 41 and the oil opening 421 to press the thin plate 20, the thin plate 20 moves toward the center direction of the lower through hole along the radial direction.

The lower pressure body 40 has a substantially cylindrical shape and has an oil flow passage 41 for guiding oil. In the present embodiment, the oil passage 41 is provided inside the lower pressure body 40 and extends in the longitudinal direction of the lower pressure body 40. In other embodiments, the oil passage 41 may be disposed on a rotating surface of the lower pressure body 40 and extend along a length direction of the lower pressure body 40. The side of the pressing body 40 facing the thin plate 20 is a pressing end face 42, and an oil opening 421 is provided in the pressing end face 42. The oil opening 421 communicates with the oil flow passage 41, so that oil can be discharged from the oil opening 421 along the oil flow passage 41. In some preferred embodiments, the pressing end face 42 is provided with a recessed area (not shown) recessed along the inner side, and the oil opening 421 is located in the recessed area. In use, the oil flow passage 41 is connected to the oil pump mechanism to introduce high-pressure oil into the oil opening 421. In addition, the pressing end face 42 of the pressing body 40 extends into the upper through hole of the upper press plate 10 and applies a pressure F1 to the pressing body 40, so that the pressing end face 42 abuts against one side face of the thin plate 20, and the other side face of the thin plate 20 abuts against the lower support plate 50 or the edge of the mold 30, that is, the pressing end face 42 of the pressing body 40 abuts against the lower support plate 50 or the mold 30 through the thin plate 20, so that an oil seal is formed between the edge of the pressing body 40 and the thin plate 20. In the embodiment where the depressed area is provided on the pressing end face 42, the area of the pressing end face 42 other than the depressed area interferes with the thin plate 20 to form an oil seal, and the depressed area does not contact with the thin plate 20, so that oil can be discharged from the oil opening 421 and the thin plate 20 can be pressed. When the terminal surface 42 of pushing down contradicts in sheet metal 20, form a sealed cavity 21 between terminal surface 42 and the sheet metal 20 of pushing down, fluid warp fluid runner 41 and fluid opening 421 get into the terminal surface 42 of pushing down with in the cavity 21 that sheet metal 20 formed with the extrusion sheet metal 20 makes sheet metal 20 laminate in the inner wall extension shaping of mould 30. In a preferred embodiment, the lower support plate 50 is located above the mold 30, the upper platen 10 covers the thin plate 20, and the lower pressing body 40 vertically abuts against the mold 30 through the thin plate 20 from above the thin plate 20.

The method for hydroforming the thin plate 20 case using the thin plate 20 case hydroforming apparatus described above will be described in detail with reference to fig. 2.

First, the thin plate 20 is placed on the lower plate 50, and the thin plate 20 covers the lower through hole of the lower plate 50.

Then, the upper platen 10 is overlaid on the thin sheet 20, and a pressing force F2 is applied to the upper platen 10 to hold the thin sheet 20.

Next, the pressing body 40 is connected to the oil pump mechanism, and the pressing body 40 is moved downward until the pressing end surface 42 of the pressing body 40 abuts against the thin plate 20. At this time, the thin plate 20 abuts against the die 30, so that an oil seal is formed between the edge of the lower pressing end face 42 and the thin plate 20.

Finally, oil flows into the oil flow passage 41 in the lower pressing body 40, and flows into the cavity 21 formed by the lower pressing end face 42 of the lower pressing body 40 and the thin plate 20 through the oil opening 421 of the lower pressing end face 42 so as to extrude the thin plate 20, so that the thin plate 20 is attached to the inner wall of the die 30 for extension molding. In the extension forming process of the thin plate 20, the lower pressing body 40 is kept static, the oil liquid flows into the cavity 21 formed by the lower pressing end face 42 and the thin plate 20 through the oil liquid opening 421, the thin plate 20 gradually clings to the inner wall of the special-shaped die 30 to flow under the action of the circumferential expansion force of the oil liquid in the cavity 21, and finally the special-shaped box body is formed. During the molding process, air in the mold 30 is exhausted through the exhaust holes of the mold 30.

According to the device and the method for hydraulic molding of the thin plate box, the oil liquid flow channel 41 and the oil liquid opening 421 are arranged in the lower pressing body, the thin plate 20 to be molded is clamped by the clamping piece, then the lower pressing body 40 is abutted against the thin plate 20, so that oil liquid can enter the cavity 21 formed by the lower pressing end face 42 of the lower pressing body 40 and the thin plate 20 through the oil liquid flow channel 41 and the oil liquid opening 421, the thin plate 20 is extruded to be attached to the inner wall of the mold 30 for extending molding, and therefore the thin plate metal molding processing can be conveniently and quickly realized.

The thin plate box body hydraulic forming equipment and the method are suitable for regular box body forming structures, particularly irregular box body forming occasions, irregular box body forming processing can be achieved through the inner wall shape mechanism of the die 30, one-step forming of thin plate special-shaped box body parts with small-mouth necks, squares and the like can be completed at one time, the process cost can be reduced, and the product production efficiency can be improved.

In the several embodiments provided in the present invention, it should be understood that it is apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. The terms first, second, etc. are used to denote names, but not any particular order.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention.

Claims

1. A sheet metal box hydroforming apparatus for stretch forming a sheet metal along an inner wall of a die, comprising:

the clamping piece is used for clamping the thin plate to be formed;

2. The sheet cassette hydraulic molding apparatus of claim 1, wherein the clamping member includes a lower support plate for carrying the sheet and an upper platen overlying the sheet for clamping the sheet with the lower support plate.

3. The thin plate box hydroforming apparatus according to claim 2, wherein the lower plate is provided with a lower through hole, and a sidewall of the lower through hole is used for connecting the die.

4. The thin plate box hydraulic molding apparatus of claim 3, wherein the upper platen is provided with an upper through hole, and the lower through hole communicates with the lower through hole when the upper platen and the lower platen sandwich the thin plate, and the thin plate moves in a radial direction toward a center of the lower through hole when oil enters the cavity formed by the lower platen end face and the thin plate through the oil flow passage and the oil opening to press the thin plate.

5. The thin plate box hydraulic molding apparatus of claim 4, wherein the pressing body extends into the upper through hole and the pressing end face abuts against the thin plate such that an oil seal is formed between an edge of the pressing end face and the thin plate.

6. The thin plate box hydraulic molding apparatus as claimed in claim 5, wherein the pressing end face is provided with a depressed area depressed toward the inside, and the oil opening is located in the depressed area.

7. The sheet cassette hydraulic molding apparatus of claim 6, wherein the lower support plate is located above the mold, and the lower pressing body vertically abuts against the mold through the sheet from above the sheet.

8. The thin plate box hydraulic molding apparatus of claim 7, wherein the oil flow passage is provided in the lower press body and extends in a length direction of the lower press body.

9. A method for hydroforming a sheet box, comprising:

the lower pressing body is abutted against the thin plate;

10. The sheet box hydraulic forming method of claim 9, wherein when the pressing body is kept still, the oil flows into the cavity formed by the pressing end face and the sheet through the oil opening to press the sheet to be attached to the inner wall of the mold for extension, and air in the mold is exhausted through the exhaust hole of the mold.