Coaxial edge pressing device

Abstract

The utility model discloses a coaxial blank pressing device, which relates to the technical field of stretch forming and comprises a cylinder barrel, the top end and the bottom end of the cylinder barrel are closed, air holes are arranged on the right side of the cylinder barrel close to the top end and the bottom end, an open hole is arranged at the bottom end of the cylinder barrel, a piston rod is arranged in the cylinder barrel, a through hole is arranged on the piston rod, and the through hole is communicated with the through hole. A male die rod is arranged in the through hole, the top end of the male die rod is fixedly connected with the top of the cylinder barrel, and a blank holder is arranged below the cylinder barrel. The cylinder barrel and the piston rod are arranged to form a cylinder structure, and the blank holder is directly and fixedly connected to the bottom end of the piston rod, so that the piston rod directly applies pressure to the blank holder, and the pressure distribution is uniform and stable.

Description

Technical Field

[0001] The utility model relates to the technical field of stretching and forming, in particular to a coaxial edge pressing device. Background Art

[0002] Stretch forming is a metal forming technology that uses a die to apply axial tensile stress to the metal material, causing the material to deform in cross section to achieve the desired shape. This method is often used to manufacture thin-walled containers, circular or elliptical cross-section pipes, etc. Stretch forming generally stretches the middle of the material while fixing the edges of the material.

[0003] There is a coaxial linkage deep drawing blank holding device for stretch forming with a technical disclosure number of CN201371193Y. When the device is in use, the blank holding ring is driven downward by the blank holding slider to realize the blank holding. However, the blank holding slider and the blank holding ring are connected by a blank holding guide column. The pressure is dispersed during the transmission process of the blank holding guide column, and it is impossible to ensure that the pressure is evenly distributed on the blank holding ring. The stability of the blank holding guide column structure is poor and is easily damaged. The guide column and the blank holding ring are easy to fall off. Moreover, when the device is in use, the punch rod structure is independent of the bottom of the blank holding ring. When in use, the blank holding ring needs to move the length of the punch before contacting the plate. When the punch is long, the moving stroke of the blank holding ring is lengthened, affecting the processing efficiency. Utility Model Content

[0004] The utility model aims to make up for the shortcomings of the prior art, such as indirect force transmission, poor structural stability and long stroke, and provides a coaxial edge pressing device.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coaxial pressing device, including a cylinder, the top and bottom ends of the cylinder are both closed, air holes are opened at the right side of the cylinder near the top and bottom ends, an opening is opened at the bottom end of the cylinder, a piston rod is arranged in the cylinder, a through hole is opened on the piston rod, and a punch rod is arranged in the through hole, the top end of the punch rod is fixedly connected to the top of the cylinder, a pressing ring is arranged below the cylinder, the bottom end of the piston rod extends from the opening to the bottom of the cylinder and is connected to the pressing ring, the pressing ring is opened with a through hole, and the bottom end of the punch rod passes through the through hole.

[0006] As mentioned above, an overflow valve is provided on the right side of the cylinder, and the overflow valve is fixedly connected to the air hole on the upper right side of the cylinder.

[0007] As mentioned above, annular grooves are provided on the circumferential side and the inner wall of the piston rod near the top, and the inner sleeves of the two annular grooves are provided with first sealing rings, and the two first sealing rings are respectively fitted with the inner wall of the cylinder and the punch rod.

[0008] As mentioned above, a socket is provided at the top of the cylinder barrel, a screw is fixedly connected to the top of the piston rod, the screw is inserted into the socket and is threadedly connected with a nut.

[0009] As mentioned above, a concave hole is opened at the top of the cylinder, a screw is fixedly connected to the top of the punch rod, the screw is inserted into the concave hole and threadedly connected with a nut, a groove is opened on the circumference of the screw, and a second sealing ring is sleeved in the groove.

[0010] As mentioned above, a connecting plate is provided on the top of the pressure ring, and the bottom end of the piston rod passes through the connecting plate. A countersunk hole is opened on the top of the connecting plate, and bolts are arranged in the countersunk hole. The pressure ring is fixed to the connecting plate by the bolts.

[0011] Compared with the prior art, this coaxial edge clamping device has the following beneficial effects:

[0012] 1. The utility model forms a cylinder structure by arranging a cylinder barrel and a piston rod, and the pressure ring is directly fixedly connected to the bottom end of the piston rod, so that the piston rod directly applies pressure to the pressure ring, thereby making the pressure evenly distributed, and the piston rod structure is stable and not easily damaged, and the connection with the pressure ring is firm.

[0013] 2. The utility model opens a through hole on the piston rod and inserts the punch rod into the through hole and fixes it to the cylinder barrel, thereby greatly shortening the moving stroke of the blank holder ring, so that the blank holder ring can press the plate without passing through the entire punch rod, thereby improving processing efficiency.

[0014] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or may be taught from the practice of the present invention to some extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the structure of the initial state of the utility model;

[0018] Figure 4 It is a schematic diagram of the structure of the edge pressing state of the utility model;

[0019] Figure 5 It is a schematic diagram of the structure of the stretching forming state of the utility model.

[0020] In the figure: 1. Cylinder; 2. Piston rod; 3. Punch rod; 4. Overflow valve; 5. Pressure ring; 6. Bolt; 7. Connecting plate; 8. Nut; 9. Screw; 10. First sealing ring; 11. Second sealing ring. DETAILED DESCRIPTION

[0021] 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 without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-2 As shown, the utility model provides a technical solution: a coaxial pressing device, including a cylinder 1, the top and bottom ends of the cylinder 1 are both closed, air holes are opened at the right side of the cylinder 1 near the top and bottom ends, an opening is opened at the bottom end of the cylinder 1, a piston rod 2 is arranged in the cylinder 1, a through hole is opened on the piston rod 2, and a punch rod 3 is arranged in the through hole, the top end of the punch rod 3 is fixedly connected with the top of the cylinder 1, a pressing ring 5 is arranged below the cylinder 1, the bottom end of the piston rod 2 extends from the opening to the bottom of the cylinder 1, and is connected to the pressing ring 5, the pressing ring 5 is opened with a through hole, and the bottom end of the punch rod 3 passes through the through hole.

[0023] According to the overall structure of the device, gas is input into the cylinder 1 through the air hole to push the piston rod 2 downward, and the piston rod 2 drives the pressure ring 5 to move downward to press the plate. Then the cylinder 1 drives the punch rod 3 to move downward, and the punch rod 3 presses the plate and stretches it. At the same time, the gas in the cylinder 1 is discharged from the overflow valve 4, and the piston rod 2 moves upward, and the pressure on the plate gradually decreases, so that the plate can smoothly shrink inward during the stretching process of the punch rod 3, avoiding deformation and damage of the plate caused by excessive pressure of the pressure ring 5.

[0024] like Figure 2 As shown, an overflow valve 4 is provided on the right side of the cylinder barrel 1 , and the overflow valve 4 is fixedly connected to the air hole on the upper right side of the cylinder barrel 1 .

[0025] The gas in the cylinder 1 is discharged outwards steadily and slowly through the overflow valve 4, so that during the stretching process, the pressure of the blank holder 5 on the plate gradually decreases with the stretching depth, so that the plate can shrink inwards smoothly and avoid deformation and damage of the plate.

[0026] like Figure 2 As shown, annular grooves are provided on the circumferential side and the inner wall of the piston rod 2 near the top, and the inner sleeves of the two annular grooves are provided with first sealing rings 10, and the two first sealing rings 10 are respectively fitted with the inner wall of the cylinder 1 and the punch rod 3.

[0027] The two first sealing rings 10 are used to seal the piston rod 2 and the cylinder 1, and the piston rod 2 and the punch rod 3, respectively, to ensure that the inside of the cylinder 1 is sealed so that the gas input from the air hole can push the piston rod 2 to move.

[0028] like Figure 2 As shown, a concave hole is opened at the top of the cylinder 1, and a screw rod 9 is fixedly connected to the top of the punch rod 3. The screw rod 9 is inserted into the concave hole and threadedly connected with a nut 8. A groove is opened on the side of the screw rod 9, and a second sealing ring 11 is sleeved in the groove.

[0029] The punch rod 3 is fixed to the cylinder 1 by the screw 9 and the nut 8, so that the cylinder 1 drives the punch rod 3 to move synchronously to stretch the plate. It is also convenient to replace the punch rod 3 of different lengths to facilitate the stretching processing of plates of different specifications, and the second sealing ring 11 ensures the seal between the cylinder 1 and the punch rod 3.

[0030] like Figure 2 As shown, a connecting plate 7 is provided on the top of the pressure ring 5, and the bottom end of the piston rod 2 passes through the connecting plate 7. A countersunk hole is opened on the top of the connecting plate 7, and a bolt 6 is provided in the countersunk hole. The pressure ring 5 is fixed to the connecting plate 7 by the bolt 6.

[0031] The blank holder 5 is fixed to the connecting plate 7 by bolts 6, which facilitates the disassembly and assembly of the blank holder 5, so that the blank holder 5 of different sizes can be replaced, which is suitable for the stretching processing of plates of different specifications.

[0032] Working principle: The device is installed as a whole on the stretching beam of the processing equipment. When in use, gas is input into the cylinder 1 from the air hole above the cylinder 1, so that the gas pushes the piston rod 2 to drive the blank holder 5 to move downward, so that the blank holder 5 contacts the plate to achieve edge pressing, and then the cylinder 1 drives the punch rod 3 to move downward to press the plate to stretch it. When the punch rod 3 reaches the specified depth, the stretching stops, the device moves back to its original position as a whole, and the cylinder 1 drives the punch rod 3 to move upward relative to the piston rod 2, so that the punch rod 3 is retracted into the piston rod 2, and the blank holder 5 presses the plate to separate the plate from the punch rod 3.

[0033] It should be noted that, in this article, the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model; the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected", and "connected" should be understood in a broad sense. For example, "installed" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a mechanical connection or an electrical connection; "connected" can be a direct connection, an indirect connection through an intermediate medium, or a connection between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coaxial edge pressing device, comprising a cylinder (1), characterized in that: The top and bottom of the cylinder (1) are both closed, air holes are provided on the right side of the cylinder (1) near the top and bottom, an opening is provided at the bottom of the cylinder (1), a piston rod (2) is provided in the cylinder (1), a through hole is provided on the piston rod (2), and a punch rod (3) is provided in the through hole, the top of the punch rod (3) is fixedly connected to the top of the cylinder (1), a pressure ring (5) is provided below the cylinder (1), the bottom of the piston rod (2) extends from the opening to the bottom of the cylinder (1) and is connected to the pressure ring (5), the pressure ring (5) is provided with a through hole, and the bottom of the punch rod (3) passes through the through hole.

2. A coaxial edge pressing device according to claim 1, characterized in that: The right side of the cylinder barrel (1) is provided with an overflow valve (4), and the overflow valve (4) is fixedly connected to the air hole at the upper right side of the cylinder barrel (1).

3. The coaxial edge pressing device according to claim 1, characterized in that: The piston rod (2) is provided with annular grooves on its circumferential side and inner wall near the top end, and the two annular grooves are provided with first sealing rings (10) in the inner sleeves. The two first sealing rings (10) are respectively fitted with the inner wall of the cylinder barrel (1) and the punch rod (3).

4. The coaxial edge pressing device according to claim 1, characterized in that: The top of the cylinder (1) is provided with a concave hole, the top of the male mold rod (3) is fixedly connected with a screw rod (9), the screw rod (9) is inserted into the concave hole and is threadedly connected with a nut (8), a groove is provided on the circumference of the screw rod (9), and a second sealing ring (11) is sleeved in the groove.

5. The coaxial edge pressing device according to claim 1, characterized in that: A connecting plate (7) is provided on the top of the pressure ring (5), and the bottom end of the piston rod (2) passes through the connecting plate (7). A countersunk hole is provided on the top of the connecting plate (7), and a bolt (6) is provided in the countersunk hole. The pressure ring (5) is fixed to the connecting plate (7) by the bolt (6).

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