Punching device without punch-die and punch-die

Abstract

The utility model relates to the field of pipe fitting punching, and discloses a punch-die-free punching device which comprises an installation die for placing a pipe body, the pipe body penetrates through an installation channel of the installation die and is matched with the installation channel in the circumferential direction, pressure relief channels are arranged in the installation die, and the number of the pressure relief channels is the same as the number of holes needing to be formed in the pipe body. An opening in one end of the pressure relief channel is opposite to the position, needing to be perforated, of the pipe body, and the interior of the pipe body is of a closed structure and is filled with pressurized matter. The punching die has the advantages of being simple in structure, high in practicability, wide in application range, few in working procedure, small in error, beneficial to meeting the punching position degree, high in production efficiency, good in punching quality and capable of avoiding punching pits.

Description

Technical Field

[0001] The utility model relates to the field of pipe fitting punching, in particular to a punching device without convex and concave dies. Background Art

[0002] When punching pipe fittings, when punching some special-shaped pipe fittings, since the die cannot be placed at the position to be punched in the middle of the special-shaped pipe fitting, ordinary concave and convex dies are often not used for punching. Generally, an internal high-pressure hydroforming process is adopted, that is, in a sealed state inside the pipe, liquid is injected into the pipe to pressurize the inside of the pipe. When the pressure inside the pipe reaches more than 100 MPA, the external punch punches the corresponding position of the pipe. Since the punching direction is from the outside of the pipe to the inside of the pipe, and the liquid inside the pipe acts as the die without support, the circumference of the punched hole will sink into the pipe.

[0003] For some pipe fittings with ordinary shapes, such as circular or square pipe fittings, when punching, a mandrel generally acts as the die, and the punch punches down to complete the punching. When multiple punches need to be punched on the pipe fitting, multiple processes are often required to complete. More processes will lead to the accumulation of errors between processes, and finally the hole position accuracy cannot meet the requirements. Summary of the Utility Model

[0004] In order to overcome the problems that the ordinary concave and convex die punching process in the above background art cannot punch the middle position of special-shaped pipe fittings and the excessive error accumulation leads to the hole position accuracy not meeting the requirements, and the holes punched by the existing high-pressure hydroforming process will produce depressions, the utility model provides a punching device without convex and concave dies. By forming a high-pressure environment inside the pipe and cooperating with the pressure relief channel, the position on the pipe body where the hole needs to be opened opens outward under the action of the internal and external pressure difference, having the beneficial effects of simple structure, strong practicability, wide application range, few processes, small error, being beneficial to meeting the hole position accuracy, high production efficiency, good punching quality and avoiding the depression of punching.

[0005] The technical solution of the utility model is as follows:

[0006] A punching device without convex and concave dies includes an installation die for placing the pipe body. The pipe body passes through the installation channel of the installation die and is circumferentially matched with it. A pressure relief channel is arranged in the installation die. The number of the pressure relief channels is the same as the number of holes to be opened on the pipe body. One end opening of the pressure relief channel is opposite to the corresponding position on the pipe body where the hole needs to be opened. The inside of the pipe body is a closed structure and is connected with a pressurized substance.

[0007] Compared with the prior art, the beneficial effect of this technical solution lies in:

[0008] (1) By introducing a pressurized substance into the tube to form a high-pressure environment, and then cooperating with a pressure relief channel connected to the position where an opening is required, the pressure in the pressure relief channel is reduced, and the pressure difference between the inside of the tube and the outside opening position of the tube is increased, so that the tube can open an opening outward under the action of the internal and external pressure difference at the position where the hole needs to be punched. Therefore, by introducing a pressurized substance into the tube to form a female die, the problem in the background art that the position where punching is required in the middle of the special-shaped pipe fitting cannot be punched because the female die cannot be placed and ordinary male and female dies cannot be used for punching is solved. At the same time, punching from the inside of the tube to the outside also solves the problem that in the high-pressure liquid filling forming process, when punching from the outside of the tube to the inside, the liquid inside the tube acts as a female die without support, resulting in the circumferential direction of the punched hole being sunken into the tube;

[0009] (2) In this device, the installation channel for installing the mold is matched with the shape of the circumference of the tube. Therefore, this punching device is not only applicable to punching special-shaped parts, but can also punch ordinary round tubes or square tubes, with strong practicability and a wide range of applications;

[0010] (3) By providing pressure relief channels with the same number as the number of holes to be punched, it can punch multiple punching positions on the pipe fitting, reduce the punching process, reduce errors, and is beneficial to meeting the punching position accuracy.

[0011] Preferably, the installation mold includes an upper mold cavity and a lower mold cavity. After the upper mold cavity and the lower mold cavity are closed, an installation channel is formed.

[0012] Preferably, a pressure relief rod is slidably connected in each pressure relief channel and has a zero-clearance fit with it. The pressure relief channel adjusts the pressure inside it by the position of the pressure relief rod on its inner wall.

[0013] Further preferably, the fixed end of the pressure relief rod is fixedly connected to the output end of the hydraulic cylinder, and the movable end faces the position where the hole needs to be punched on the tube.

[0014] Further preferably, the pressure relief rod is selected as a waste ejector rod.

[0015] Preferably, one end of the tube is provided with an injection push head, and the other end is provided with a plugging push head. The pressurized substance is injected into the tube from the injection push head.

[0016] Further preferably, the injection push head and the plugging push head respectively extend into the two end ports of the tube, and are slidably connected to it through interference fit and adjust the pressure inside the tube.

[0017] Preferably, the pressurized substance is selected as a liquid or a gas.

[0018] Further preferably, the liquid is selected as tap water, and the gas is selected as hot air.

[0019] Preferably, the pressure inside the tube ranges from 150 MPa to 200 MPa. Brief Description of the Drawings

[0020] The present utility model will be described with reference to the accompanying drawings, wherein:

[0021] Figure 1 is a schematic structural diagram of the whole of the present utility model.

[0022] Reference numerals in the drawings: pipe body 1, injection push head 11, plugging push head 12, installation mold 2, installation channel 21, pressure relief channel 22, upper mold cavity 23, lower mold cavity 24, pressure relief rod 3, hydraulic cylinder 31. Detailed Description of the Preferred Embodiments

[0023] In order to make the objectives, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0024] Embodiment 1: As shown in Figure 1 a punching device without a convex die and a concave die, which includes an installation mold 2 for placing the pipe body 1, that is, the pipe body 1 passes through the installation channel 21 of the installation mold 2 and is placed in the installation channel 21. The installation channel 21 matches the circumferential shape of the pipe body 1. A plurality of pressure relief channels 22 are provided in the installation mold 2. The pressure relief channels 22 can change the internal space to adjust the internal pressure, so as to generate a large pressure difference with the inside of the pipe body 1. One end opening of the pressure relief channel 22 is opposite to and connected to the position on the pipe body 1 where a hole needs to be opened, and its shape is the same as the shape of the hole to be opened. The extending direction of the pressure relief channel 22 is perpendicular to the corresponding hole opening position on the pipe body 1, and the number of its openings is the same as the number of holes to be punched on the pipe body 1. The inside of the pipe body 1 is a closed structure and is filled with a pressurized substance, and the inside of the pipe body 1 is pressurized.

[0025] During use, the pressurized substance is introduced into the pipe body 1 from the port of the pipe body 1, so that the pressure inside the pipe body 1 increases, the pipe body 1 expands, and the outer wall of the pipe body tightly fits with the inner wall of the installation channel 21 of the installation mold 2. Then, the pressure in a plurality of pressure relief channels 22 is changed to reduce the internal pressure thereof, and the pressure difference between the inside and outside of the position on the pipe body 1 where a hole needs to be opened increases. The pressure from the inside of the pipe to the outside of the pipe borne by this position is further enhanced. Accordingly, a plurality of holes are punched through the wall body at the corresponding position, and other positions inside the pipe body 1 are not broken because they are closely attached to the installation channel 21 and no additional pressure is applied outside the pipe.

[0026] In this embodiment, a pressurized substance is introduced into the tube to form a high-pressure environment, and then it is combined with the pressure relief channel 22 connected to the position where an opening is required to reduce the pressure in the pressure relief channel 22 and increase the pressure difference between the inside of the tube body 1 and the opening position outside the tube body 1. As a result, the tube body 1 can open outward under the action of the internal and external pressure difference at the position where a hole needs to be punched. Therefore, by introducing a pressurized substance into the tube to form a female die, the problem in the background art that the position in the middle of the special-shaped pipe fitting where punching is required cannot use ordinary female and male dies for punching because the female die cannot be placed is solved. At the same time, punching from the inside of the tube to the outside also solves the problem that in the high-pressure liquid filling forming process, when punching from the outside of the tube to the inside, the liquid inside the tube acts as a female die without support, resulting in the circumferential direction of the punched hole being sunken into the tube. In addition, the installation channel 21 of the installation die 2 in this embodiment is matched with the shape of the circumference of the tube body 1. Therefore, this punching device can not only punch special-shaped parts, but also punch ordinary round pipes or square pipes, with strong practicability and a wide range of applications. By setting the pressure relief channels 22 with the same number as the number of holes to be punched, it can punch multiple punching positions on the pipe fitting, reduce the punching process, reduce errors, and is conducive to meeting the punching position accuracy.

[0027] Embodiment 2: On the basis of Embodiment 1, an optimized design is carried out on the installation die 2. The installation die 2 includes an upper mold cavity 23 and a lower mold cavity 24. When the upper mold cavity 23 and the lower mold cavity 24 are closed, the connection part forms the installation channel 21. During use, first place the pipe fitting in the corresponding position in the lower mold cavity 24, and then close the upper mold cavity 23 and the lower mold cavity 24. The upper mold cavity 23 and the lower mold cavity 24 can be detachably and fixedly connected by means of threaded connection to ensure the stability during work. After the upper mold cavity 23 and the lower mold cavity 24 are closed, a complete installation channel 21 is formed. By setting the installation die 2 as a separable upper mold cavity 23 and lower mold cavity 24, the tube body 1 can be very conveniently placed into the installation channel 21 regardless of its shape, improving the convenience of use.

[0028] Embodiment 3: On the basis of Embodiment 1, an optimized design is carried out on the pressure relief channel 22. A pressure relief rod 3 is slidably connected in each pressure relief channel 22. The circumference of the pressure relief rod 3 is in zero-clearance fit with the inner wall of the pressure relief channel 22. The pressure relief channel 22 adjusts the pressure inside it by adjusting the position of the pressure relief rod 3 on its inner wall. Since the circumference of the pressure relief rod 3 is in zero-clearance fit with the inner wall of the pressure relief channel 22, a closed space is formed between the end of the pressure relief rod 3 and the position on the tube body 1 where a hole needs to be punched. When the pressure relief rod 3 moves outward from the pressure relief channel 22, the space between the pressure relief channel 22 and the punching position on the tube body 1 becomes larger and the pressure becomes smaller, and the internal and external pressure difference at the punching position on the tube body 1 becomes larger. On the contrary, the space between the two becomes smaller, the pressure becomes larger, and the pressure difference becomes smaller. Thus, by setting the pressure relief rod 3 slidably connected in the pressure relief channel 22 and in zero-clearance fit with it, the internal and external pressure difference at the punching position on the tube body 1 can be adjusted to complete the punching process.

[0029] Furthermore, the fixed end of the pressure relief rod 3 is fixedly connected to the output end of the hydraulic cylinder 31, and the movable end is opposite to the position on the pipe body 1 where an opening needs to be made. The pressure relief rod 3 is selected as a waste ejector rod. Driving the waste ejector rod to move up and down by using the hydraulic cylinder 31 is beneficial to automate the punching process of the pipe fitting, saving manpower. Moreover, the pulling force that the hydraulic cylinder 31 can provide can generate a sufficient internal and external pressure difference at the position on the pipe body 1 where punching is required, completing the punching of the pipe fitting.

[0030] Embodiment 4: On the basis of Embodiment 1, an optimized design is carried out. One end of the pipe body 1 is provided with an injection push head 11, and the other end is provided with a plugging push head 12. The injection push head 11 and the plugging push head 12 respectively extend into the two ends of the pipe body 1 and are slidably connected to it through interference fit. The connection method of interference fit between the injection push head 11 and the plugging push head 12 ensures the sealing inside the pipe body 1. The pressurizing substance is injected into the pipe body 1 from the injection push head 11. Since the other end of the pipe body 1 is blocked by the plugging push head 12, and the injection push head 11 and the plugging push head 12 continuously move towards the middle of the pipe body 1 at the same time, injecting the pressurizing substance through the injection push head 11 can quickly increase the pressure inside the pipe body 1. Among them, the injection push head 11 and the plugging push head 12 can be driven by a cylinder. The pressurizing substance is selected as a liquid or a gas. If a liquid is used, tap water can be used. If a gas is selected, hot air can be used. When using a heated gas, the gas expansion can enhance the pressure inside the pipe faster. Among them, the pressure range of the pressurizing substance for pressurizing the inside of the pipe body 1 is 150 MPa - 200 MPa. Less than 150 MPa cannot play a role in breaking through the pipe wall at the position on the pipe body 1 where an opening is required, and greater than 200 MPa is likely to cause the problem of overall rupture of the pipe body 1.

[0031] During use, install this device on an internal high-pressure liquid filling forming equipment. First, load the pipe fitting into the lower mold cavity 24, and then close the upper mold cavity 23 and the lower mold cavity 24. After closing the mold, the injection push head 11 and the plugging push head 12 push towards the middle of the pipe body 1 and continuously fill the pipe fitting with the pressurizing substance, causing the outer wall of the pipe fitting to expand and closely fit with the inner wall of the installation channel 21. At this time, punching is carried out. Control different hydraulic cylinders 31 to drive the waste ejector rod to move outwards from the pressure relief channel 22, increasing the internal and external pressure difference of the pipe wall at the position on the pipe body 1 where punching is required. Utilize the internal and external pressure difference to punch different positions on the pipe body 1 from the inside to the outside, and fill the waste into the pressure relief channel 22. After punching is completed, the upper mold cavity 23, the injection push head 11, the plugging push head 12, and the waste ejector rod return to the initial position. The hydraulic cylinder 31 drives the waste ejector rod to move towards the pipe body 1 to eject the waste out of the pressure relief channel 22, completing the punching.

[0032] The above embodiments merely represent the specific implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the protection scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the technical solution of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application.

Claims

1. A punching device without convex and concave dies, characterized in that: The invention comprises a mounting mold (2) for placing a tube body (1); the tube body (1) passes through a mounting channel (21) of the mounting mold (2) and is circumferentially matched therewith; a pressure relief channel (22) is provided in the mounting mold (2); the number of the pressure relief channels (22) is the same as the number of holes required to be opened on the tube body (1); an opening at one end of the pressure relief channel (22) is opposite to a corresponding hole position required to be opened on the tube body (1); the tube body (1) is a closed structure and a pressurized substance passes therethrough.

2. A punching device without male and female dies according to claim 1, characterized in that: The installation mold (2) comprises an upper mold cavity (23) and a lower mold cavity (24), and the upper mold cavity (23) and the lower mold cavity (24) are molded together to form an installation channel (21).

3. A punching device without male and female dies according to claim 1, characterized in that: A pressure relief rod (3) is slidably connected in each pressure relief channel (22) and is matched with the pressure relief rod (3) with zero clearance. The pressure relief channel (22) adjusts the pressure inside the pressure relief channel (22) by the position of the pressure relief rod (3) on its inner wall.

4. A punching device without male and female dies according to claim 3, characterized in that: The fixed end of the pressure release rod (3) is fixedly connected to the output end of the hydraulic cylinder (31), and the movable end is opposite to the position where a hole is to be opened on the pipe body (1).

5. A punching device without male and female dies according to claim 3, characterized in that: The pressure release rod (3) is a waste ejector rod.

6. A punching device without male and female dies according to claim 1, characterized in that: An injection pusher (11) is provided at one end of the tube body (1), and a plugging pusher (12) is provided at the other end, and the pressurized substance is injected into the tube body (1) from the injection pusher (11).

7. A punching device without male and female dies according to claim 6, characterized in that: The injection push head (11) and the plugging push head (12) extend into the two ports of the tube body (1) respectively, and are slidably connected thereto through interference fit to adjust the pressure in the tube body (1).

8. The punching device without male and female dies according to claim 1, characterized in that: The pressurized substance is selected from liquid or gas.

9. A punching device without male and female dies according to claim 8, characterized in that: The liquid is tap water, and the gas is hot air.

10. The punching device without male and female dies according to claim 1, characterized in that: The pressure range of the pressurized interior of the tube body (1) is 150 MPa-200 MPa.

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