An internal high-pressure piercing device and method thereof

Abstract

The application provides an internal high-pressure punching device and a method thereof, and belongs to the technical field of machinery. The internal high-pressure punching device comprises a lower die, an upper die, a channel for accommodating a pipe, a liquid injection port, a liquid discharge hole, a support component, and at least one limiting piece. The upper die is connected with the lower die and forms the channel for accommodating the pipe. One end of the channel serves as the liquid injection port. The upper die is provided with the liquid discharge hole which penetrates the inner wall and the outer wall of the upper die and is in communication with the channel. The liquid discharge hole is perpendicular to the channel. The inner wall of the liquid discharge hole and the inner wall of the channel form a cutting part. The support component has a support state and a movable state. One end of the support component is provided with a support surface for supporting the outer wall of the pipe. In the support state, at least part of the support component is inserted into the liquid discharge hole. In the movable state, the support component can move along the depth direction of the liquid discharge hole and can be taken out of the liquid discharge hole. The limiting piece can cooperate with the support component to enable the support component to switch between the support state and the movable state.

Description

TECHNICAL FIELD

[0001] The present application belongs to the mechanical technical field, and particularly relates to an internal high-pressure punching device and a method thereof. BACKGROUND

[0002] In the prior art, an internal high-pressure punching process is as follows: a corresponding gap is made at a position corresponding to an internal high-pressure die surface of a pipe material to be punched, a punch is used to fill the gap, a punch fixing seat is arranged behind the punch, a punching oil cylinder is connected to the rear of the punch fixing seat, the punching oil cylinder is connected to an oil pressure system of a press, when the internal pressure of the pipe material reaches a set punching pressure, for example, 150 MPa, the system sends a signal to the oil press that the punching condition is met, the PLC control system of the press determines whether the punching condition is met according to the received pressure signal, and sends a punching signal after the punching condition is met, and the oil pressure system drives the oil cylinder to be fixed at the moment, and the ejection force needs to overcome the blanking force of the pipe material plate thickness and the internal high-pressure pressure.

[0003] The defect of the prior art is that the size of the punched hole is limited, and a conventional oil cylinder cannot provide such a large ejection force for a hole with a diameter of more than 30 mm. The larger the oil cylinder occupies, the greater the space, and the greater the influence on the overall strength of the die, and the machining amount of the die also increases accordingly. The traditional internal high-pressure punching process is characterized in that the punching direction is from the outside of the pipe to the inside of the pipe. SUMMARY

[0004] The present application aims at the above-mentioned problems existing in the prior art, and provides an internal high-pressure punching device and a method thereof, which solve the problems that large-diameter punching is difficult to be realized in traditional internal high-pressure production, and a super-large oil cylinder needs to be selected for a hole with a diameter of more than 30 mm in the manufacturing process of the internal high-pressure die.

[0005] The object of the present application can be achieved by the following technical solutions.

[0006] An internal high-pressure punching device, characterized in that it comprises

[0007] a lower die;

[0008] an upper die, which is connected to the lower die and forms a channel adapted to the pipe material, one end of the channel serving as a liquid injection port, the upper die being provided with a liquid discharge hole penetrating the inner wall and the outer wall of the upper die and being in communication with the channel, the liquid discharge hole being perpendicular to the channel, and the hole wall of the liquid discharge hole and the inner wall of the channel forming a cutting part;

[0009] A support component having a support state and a movable state, one end of the support component being provided with a support surface for supporting an outer wall of a pipe; wherein in the support state, at least part of the support component is inserted into the drain hole, and in the movable state, the support component can move along the depth direction of the drain hole and can be pulled out of the drain hole; and

[0010] At least one limiting piece capable of cooperating with the support component to enable the support component to switch between the support state and the movable state.

[0011] In the above internal high-pressure piercing device, the support component comprises

[0012] A fixed seat having at least one limiting groove, in the support state, the limiting piece is inserted into the limiting groove to limit the movement of the fixed seat along the depth direction of the drain hole; and

[0013] A support rod connected with the fixed seat and capable of being inserted into the drain hole, the support surface being arranged at the end of the support rod.

[0014] In the above internal high-pressure piercing device, the internal high-pressure piercing device further comprises at least one driving piece connected with the limiting piece for inserting into or pulling out of the limiting groove.

[0015] In the above internal high-pressure piercing device, in the support state, the inner wall of the passage near the drain hole is in the same plane as the support surface.

[0016] In the above internal high-pressure piercing device, in the support state, the inner wall of the passage near the drain hole and the support surface combine to form a continuous structural wall.

[0017] In the above internal high-pressure piercing device, the movement direction of the limiting piece is perpendicular to the movement direction of the support component.

[0018] In the above internal high-pressure piercing device, the hole wall of the drain hole and the inner wall of the passage near the drain hole form an included angle, and the included angle is not greater than 90°.

[0019] In the above internal high-pressure piercing device, the internal high-pressure piercing device further comprises an elastic piece and a positioning piece, one end of the elastic piece being connected with the fixed seat and the other end being connected with the positioning piece, the elastic piece being capable of enabling the fixed seat to abut against the outer wall of the upper die.

[0020] In the above internal high-pressure piercing device, the compressible length of the elastic piece is greater than the length of the drain hole.

[0021] An internal high-pressure punching method, characterized in that it comprises the following steps:

[0022] Setting a pipe into a channel;

[0023] Injecting a high-pressure liquid into the pipe, and making the pressure of the high-pressure liquid in the pipe reach a preset pressure value; the preset pressure value is not less than the minimum pressure value at which the pipe wall is broken;

[0024] Releasing the locking of the support part by the limiting part;

[0025] Forming a pressure difference between the inside and the outside of the pipe instantaneously, so that the high-pressure liquid is discharged along the direction of the liquid discharge hole, and the wall of the pipe is cut off locally under the action of the cutting part, to form a through hole.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] 1. The internal pressure of the pipe is directly increased, and a support part is arranged at the position where the hole is needed to be punched; when the internal pressure reaches a preset condition, the restriction on the support part is directly released, so that the internal liquid is instantaneously discharged along the liquid discharge hole and cut off, and the problem of using an oversized oil cylinder for a hole with a diameter of more than 30 mm is solved.

[0028] 2. Since the hole is punched from the inside to the outside, the workload of the subsequent laser cutting can be reduced, and the problem of inward collapse of the punching position can be effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic view of the pipe after being loaded in the present application;

[0030] Figure 2 is a schematic view of injecting a high-pressure liquid into the pipe in the present application;

[0031] Figure 3 is a schematic view of the limiting part being separated from the support part in the present application;

[0032] Figure 4 is a schematic view of the high-pressure liquid punching in the pipe in the present application;

[0033] Figure 5 is a structural schematic view of the present application.

[0034] In the drawings,

[0035] 100, pipe; 101, through hole;

[0036] 2, lower die;

[0037] 3, upper die; 31, liquid discharge hole; 32, inner wall; 33, outer wall; 34, cutting part;

[0038] 4. Supporting components; 41. Fixing base; 411. Limiting groove; 42. Support rod; 421. Supporting surface;

[0039] 5. Limiting components;

[0040] 6. Passageway;

[0041] 7. Driving components;

[0042] 8. Elastic components;

[0043] 9. Positioning components. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0045] like Figures 1-5 As shown, an internal high-pressure punching device includes a lower die 2, an upper die 3, a support component 4, and at least one limiting component 5. The upper die 3 is connected to the lower die 2 to form a channel 6 adapted to the pipe 100, and one end of the channel 6 serves as a liquid injection port. The upper die 3 is provided with a drain hole 31, which penetrates the inner wall 32 and the outer wall 33 of the upper die 3 and communicates with the channel 6. The drain hole 31 is perpendicular to the channel 6. The hole wall of the drain hole 31 and the inner wall 32 of the channel 6 near the drain hole 31 form a cutting portion 34. Component 4 has a supported state and an active state. One end of the supporting component 4 is provided with a supporting surface 421 for supporting the outer wall 33 of the supporting pipe 100. The supporting surface 421 can extend into the drain hole 31. In the supported state, at least part of the supporting component 4 is inserted into the drain hole 31. In the active state, the supporting component 4 can move along the depth direction of the drain hole 31 and can be dislodged from the drain hole 31. The limiting member 5 can cooperate with the supporting component 4 so that the supporting component 4 can switch between the supported state and the active state.

[0046] In the present application, the pipe 100 is arranged in the channel 6, and the channel 6 is adapted to the pipe 100, the outer wall 33 of the pipe 100 is attached to the inner wall 32 of the channel 6, and when the high-pressure liquid is injected, the pipe 100 is prevented from being deformed by the abutting of the inner wall 32 of the channel 6. When the high-pressure liquid is injected from one end, the other end of the channel 6 is closed by the blocking member until the internal liquid pressure reaches a preset pressure value, which is greater than or less than the minimum pressure value at which the wall of the pipe 100 is broken; then the limiting piece 5 is disengaged from the supporting member 4, and the supporting member 4 is switched from the supporting state to the movable state, so that the supporting member 4 is instantaneously in a state without limiting device, the supporting member 4 at the position of the liquid discharge hole 31 no longer plays a supporting role, and a pressure difference is formed between the inside of the pipe 100 and the position of the pipe 100 corresponding to the liquid discharge hole 31, the high-pressure liquid immediately finds a breakthrough and breaks the wall of the pipe 100 at the position of the liquid discharge hole 31, and under the cooperation of the cutting part 34, the pipe 100 is cut into a hole with the same shape as the cutting part 34, and the high-pressure liquid also pushes the supporting member 4 out of the liquid discharge hole 31, so that part of the high-pressure liquid is discharged.

[0047] In the present application, as shown in Figure 1 and Figure 2 , the supporting state refers to a state in which the supporting member 4 cannot move after the limiting piece 5 cooperates with the supporting member 4, as shown in Figures 3-5 , the movable state refers to a state in which the supporting member 4 can move after the limiting piece 5 is separated from the supporting member 4.

[0048] The design of the supporting surface 421 can support the wall of the pipe 100 at the position of the liquid discharge hole 31, prevent the wall of the pipe 100 from deforming in advance, and reduce the cutting effect after the internal and external pressure difference is rapidly changed. If there is no design of the supporting member 4 at this position, the wall of the pipe 100 at the position corresponding to the liquid discharge hole 31 will break from the center position corresponding to the liquid discharge hole 31 in advance during the injection of the high-pressure liquid, which will cause the internal high-pressure liquid to leak and result in failure.

[0049] The junction position of the hole wall of the liquid discharge hole 31 and the inner wall 32 of the channel 6 forms a cutting part 34; the cutting part 34 is generally annular, square or other shapes.

[0050] The liquid discharge hole 31 is perpendicular to the channel 6, so that the wall of the pipe 100 at the position of the liquid discharge hole 31 is subjected to more uniform internal high-pressure liquid pressure, thereby being able to cut a through hole 101 corresponding to the cutting part 34 when the external supporting member 4 is suddenly removed.

[0051] In the implementation process, the limiting piece 5 can be matched with the supporting part 4 in a buckle type, a clamping type, an abutting type, etc., as long as the supporting part 4 can be instantaneously released from the limiting after the limiting piece 5 moves. In the embodiment, the clamping type is adopted.

[0052] Specifically, as shown in Figures 1-2 The supporting part 4 includes a fixed seat 41 and a supporting rod 42. The fixed seat 41 is provided with at least one limiting groove 411. In the supporting state, the limiting piece 5 is inserted into the limiting groove 411 to limit the movement of the fixed seat 41 along the depth direction of the drainage hole 31. The supporting rod 42 is connected with the fixed seat 41 and can be inserted into the drainage hole 31. A supporting surface 421 is arranged at the end of the supporting rod 42.

[0053] In the application, the limiting piece 5 is inserted into the limiting groove 411 of the fixed seat 41, so that the supporting rod 42 of the supporting part 4 can limit the movement along the depth direction of the drainage hole 31.

[0054] After the limiting piece 5 is inserted into the limiting groove 411, the limiting piece 5 abuts against the side wall of the limiting groove 411 away from or close to the drainage groove, so that the fixed seat 41 cannot move after the limiting piece 5 is inserted into the limiting groove 411.

[0055] Specifically, as shown in Figures 1-5 The inner high-pressure piercing device further includes at least one driving piece 7 connected with the limiting piece 5, which is used to drive the limiting piece 5 to be inserted into or separated from the limiting groove 411.

[0056] The driving piece 7 drives the limiting piece 5 to move.

[0057] In the embodiment, the driving piece 7 is a push rod motor, a pneumatic cylinder or a hydraulic cylinder.

[0058] In the embodiment, there are two limiting pieces 5 arranged on both sides of the fixed seat 41, and there are also two driving pieces 7 connected with the limiting pieces 5.

[0059] Specifically, as shown in Figures 1-2 In the supporting state, the inner wall 32 of the channel 6 close to the drainage hole 31 is in the same plane as the supporting surface 421.

[0060] In the embodiment, when the supporting surface 421 is in the same plane as the inner wall 32 of the channel 6 close to the drainage hole 31, the possibility of deformation of the outer wall 33 of the pipe 100 is reduced during the supporting process, which is conducive to the subsequent sudden change of the internal and external pressure, thereby realizing the cutting.

[0061] Specifically, as shown in Figures 1-2As shown, in the supported state, the inner wall 32 of the channel 6 near the drain hole 31 and the support surface 421 combine to form a continuous structural wall.

[0062] In this embodiment, the inner wall 32 of the channel 6 near the drain hole 31 and the support surface 421 are combined to form a continuous structural wall. This ensures that after the outer wall 33 of the pipe 100 is against the outer wall 33, the outer wall 33 of the pipe 100 will not form an indentation between the support surface 421 and the inner wall 32 of the channel 6 due to excessive internal pressure, which may affect subsequent cutting.

[0063] Specifically, such as Figures 1-5 As shown, the moving direction of the limiting member 5 is perpendicular to the moving direction of the supporting member 4.

[0064] This design makes it easier for the limiting member 5 to be inserted into the limiting groove 411 and also easier to be pulled out of the limiting groove 411.

[0065] Specifically, such as Figures 1-5 As shown, the wall of the drain hole 31 forms an angle α with the inner wall 32 of the channel 6 near the drain hole 31, and the angle is no greater than 90°.

[0066] This design facilitates the cutting of the pipe 100. In this embodiment, a 90° angle is selected. Of course, angles of 80°, 70°, 65°, 60°, 40°, etc., can also be selected.

[0067] Specifically, such as Figures 1-5 As shown, the internal high-pressure punching device also includes an elastic element 8 and a positioning element 9. One end of the elastic element 8 is connected to the fixed seat 41, and the other end is connected to the positioning element 9. The elastic element 8 enables the fixed seat 41 to abut against the outer wall 33 of the upper mold 3.

[0068] When the pressure inside the channel 6 is the same as the external pressure, the support member 4 can be re-inserted into the drain hole 31 by means of the elastic member 8, and then the limiting member 5 can be driven to be inserted into the limiting groove 411 of the support member 4 to re-limit the support member 4.

[0069] During the depressurization process, the limiting member 5 releases its restriction on the supporting member 4. At this time, the elastic member 8 still provides support. However, the pressure inside the pipe 100 is too high. The high-pressure liquid squeezes the wall of the pipe 100 and, with the cooperation of the cutting part 34, cuts off a portion of the wall. The high-pressure liquid inside carries the cut-off wall and is sent out through the drain hole 31.

[0070] In this embodiment, the positioning component 9 is connected to the cylinder of the driving component 7 and is connected to the upper mold 3.

[0071] Specifically, such as Figures 1-5 As shown, the compressible length of the elastic element 8 is greater than the length of the drain hole 31.

[0072] This design allows the support rod 42, located inside the drain hole 31, to be completely dislodged, thus facilitating the discharge of the internal high-pressure liquid.

[0073] A method for internal high-pressure punching, characterized by comprising the following steps:

[0074] like Figure 1 As shown, pipe 100 is installed inside channel 6;

[0075] like Figure 2 As shown, high-pressure liquid is injected into pipe 100, and the pressure of the high-pressure liquid in pipe 100 reaches a preset pressure value; the preset pressure value is not less than the minimum pressure value for breaking the pipe wall of pipe 100; the pressure of the high-pressure liquid can reach between 100-300MPa.

[0076] like Figure 3 As shown, the locking of the limiting member 5 to the supporting member 4 is released;

[0077] like Figure 4 As shown, a pressure difference is instantaneously formed between the inside and outside of the pipe 100, so that the high-pressure liquid is discharged along the direction of the drain hole 31. Under the action of the cutting part 34, the wall of the pipe 100 is cut off to form a through hole 101.

[0078] This invention can achieve punching range: punching holes with a diameter D ≥ 2 times the plate thickness.

[0079] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0080] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Meanwhile, the meaning of "and / or" throughout the text includes three solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0081] All the above components are general standard components or components known to those skilled in the art, the structure and principle of which can be known by those skilled in the art through technical manuals or through conventional experimental methods.

[0082] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art can make various modifications or supplements to the specific embodiments described or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A method of internal high pressure piercing, which is processed by an internal high pressure piercing device, characterized by, The internal high-pressure punching device comprises: a lower die (2); an upper die (3) connected with the lower die (2) and forming a passage (6) in which a pipe (100) is arranged, one end of the passage (6) serving as a liquid injection port, the upper die (3) being provided with a liquid discharge hole (31) penetrating through the inner wall (32) and the outer wall (33) of the upper die (3) and being in communication with the passage (6); the liquid discharge hole (31) is perpendicular to the passage (6); the hole wall of the liquid discharge hole (31) and the inner wall (32) of the passage (6) form a cutting part (34); a support component (4) having a support state and a movable state, one end of the support component (4) being provided with a support surface (421) supporting the outer wall (33) of the pipe (100); in the support state, at least part of the support component (4) is inserted into the liquid discharge hole (31); in the movable state, the support component (4) can move along the depth direction of the liquid discharge hole (31) and can be pulled out of the liquid discharge hole (31); and at least one limiting part (5) capable of cooperating with the support component (4) to switch the support component (4) between the support state and the movable state; the support component (4) comprises a fixed seat (41) provided with at least one limiting groove (411), in the support state, the limiting part (5) is inserted into the limiting groove (411) to limit the movement of the fixed seat (41) along the depth direction of the liquid discharge hole (31); and a support rod (42) connected with the fixed seat (41) and capable of being inserted into the liquid discharge hole (31), the support surface (421) being arranged at the end of the support rod (42); the internal high-pressure punching device further comprises at least one driving part (7) connected with the limiting part (5) for inserting the limiting part (5) into the limiting groove (411) or pulling the limiting part (5) out of the limiting groove (411); the method comprises the following steps: arranging the pipe (100) into the passage (6); injecting high-pressure liquid into the pipe (100) and making the pressure of the high-pressure liquid in the pipe (100) reach a preset pressure value; the preset pressure value is not less than the minimum pressure value at which the pipe (100) is broken; unlocking the support component (4) by the limiting part (5); a pressure difference is formed between the inside and the outside of the pipe (100) to make the high-pressure liquid discharge along the direction of the liquid discharge hole (31) and cut the local wall of the pipe (100) under the action of the cutting part (34) to form a through hole (101).

2. The internal high pressure piercing method according to claim 1, characterized by in the support state, the inner wall (32) of the passage (6) close to the liquid discharge hole (31) is in the same plane as the support surface (421).

3. The internal high pressure piercing method according to claim 1, characterized by in the support state, the inner wall (32) of the passage (6) close to the liquid discharge hole (31) and the support surface (421) form a continuous structure wall.

4. The internal high pressure piercing method according to claim 1, characterized by The moving direction of the limiting member (5) is perpendicular to the moving direction of the supporting member (4).

5. The internal high pressure piercing method according to claim 1, wherein The hole wall of the drainage hole (31) and the inner wall (32) of the channel (6) near the drainage hole (31) form an included angle, and the included angle is not greater than 90°.

6. The internal high pressure piercing method according to claim 1, wherein The inner high-pressure punching device further comprises an elastic member (8) and a positioning member (9), one end of the elastic member (8) is connected with the fixed seat (41), the other end of the elastic member (8) is connected with the positioning member (9), and the elastic member (8) can make the fixed seat (41) abut against the outer wall (33) of the upper die (3).

7. The internal high pressure piercing method according to claim 6, characterized in that The compressible length of the elastic member (8) is greater than the length of the drainage hole (31).

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