CN116944330A - Continuous hydraulic forming device and forming method for corrugated pipe - Google Patents

Abstract

The invention provides a continuous hydraulic forming device and a forming method for a corrugated pipe, which relate to the technical field of pipe fitting forming, wherein a cavity in a pipe blank is divided into a plurality of sub-cavities which are communicated in sequence, after the pipe blank is formed into the corrugated pipe, each sub-cavity corresponds to one node, the continuous hydraulic forming device for the corrugated pipe comprises a high-pressure source component, a shaping die, a control system and a sealing component, the sealing component can seal the two axial ends of any sub-cavity and form a sealing cavity, the high-pressure source component is communicated with the sealing cavity and can be used for introducing high-pressure liquid into the sealing cavity so as to lead the pipe blank to be primarily expanded, and the shaping die is used for carrying out die closing shaping on part of the pipe blank after the primary expansion. The scheme provided by the invention can improve the product quality.

Description

A continuous hydroforming device and forming method for bellows

Technical field

The present invention relates to the technical field of pipe forming, and in particular to a continuous hydroforming device and a forming method for corrugated pipes.

Background technique

As one of the important parts in the aerospace manufacturing field, large-diameter-thickness-ratio corrugated pipes often use multiple processes of flat plate reinforcement, rolling arc (roller), cylindrical tailor welding (longitudinal seam), and long tube splicing (circular seam). The forming process obtains corrugated pipes. Because there are welds in pipe fittings, microcracks or even cracking failures caused by stress concentration are prone to occur at the welds during service. At the same time, during the tailor welding process, the thermal stress generated by welding causes deformation of the weld area, making it difficult to guarantee product quality. Therefore, there is an urgent need to adopt new forming processes to meet design and production needs.

Contents of the invention

The purpose of the present invention is to provide a bellows continuous hydroforming device and a forming method to solve the problems existing in the above-mentioned prior art and improve product quality.

In order to achieve the above objects, the present invention provides the following solutions:

The invention provides a bellows continuous hydroforming device. The cavity in the tube blank is divided into a plurality of sequentially connected sub-cavities. After the tube blank is formed into a bellows, each of the sub-cavities corresponds to a corrugated tube. section, including a high-pressure source component, a shaping mold, a control system and a sealing component. The sealing component can seal both axial ends of any one of the sub-cavities and form a sealed cavity. The high-pressure source component is connected to the The sealing cavity is connected and can pass high-pressure liquid into the sealing cavity to preliminary expand the tube blank, and the shaping mold is used to combine the preliminary expanded portion of the tube blank outside the tube blank. During mold shaping, the control system controls the operation of the high-voltage source assembly and the shaping mold.

Preferably, the tube blank includes a plurality of sub-tube blanks connected in sequence, and one sub-tube blank corresponds to one of the sub-cavities. The bellows continuous hydroforming device also includes a tube blank pushing device, and the shaping mold is fixed. It is configured that the shaping mold is provided with a shaping station, any of the sub-tube blanks can be located on the shaping station, and the tube blank pushing device can push the tube along the axial direction of the tube blank. Blank.

Preferably, the shaping mold includes a movable module and a press. The press provides mold closing pressure to the movable module. The movable module includes an axial module, a radial module and a relatively fixed module. The axial module, the The radial module and the relatively fixed module are arranged in sequence along the axial direction of the tube base. The axial module moves along the axial direction of the tube base for mold closing. The radial module moves along the radial direction of the tube base. The mold is closed. After the mold is closed, a node forming cavity is jointly formed in the axial module, the radial module and the relatively fixed module.

Preferably, the axial module has an annular integrated structure, the radial module has an upper and lower split structure, and both parts of the radial module have a semicircular ring structure. The body realizes radial movement under the action of the radial module propulsion device; the relatively fixed module also has an upper and lower split structure, and the two split bodies of the relatively fixed module realize radial movement under the action of the fixed module propulsion device. And the distance of radial movement is greater than the maximum crest height of the bellows. A node shaping cavity is provided in the relatively fixed module. The shape and size of the node shaping cavity is consistent with that of the node shaping cavity.

Preferably, an annular sealing cavity is formed between the sealing component and the inner wall of the tube blank. A high-pressure fluid channel is provided in the sealing component. The high-pressure fluid channel is connected with the high-pressure source component. Any one inside the sealing component A high-pressure fluid channel is opened on the side, and the high-pressure fluid channel is connected with the high-pressure source component.

The present invention also provides a corrugated pipe continuous hydroforming method, which uses the bellows continuous hydroforming device as described above to sequentially perform hydroforming processing on each sub-tube blank in the pipe blank.

Preferably, it includes step 1: before forming, first determine the appropriate diameter of the tube blank and select the tube blank according to the forming requirements of the required target pipe fittings and the mechanical properties of the tube blank material, and check the performance of the corrugated pipe continuous hydroforming device ;

Step 2: Place the selected tube blank into the corrugated tube continuous hydroforming device;

Step 3: Use the sealing component to seal the inside of the tube blank. After completing the sealing, use the control system to control the high-pressure source component to generate low-pressure liquid to check whether the sealing of the tube blank is reliable and whether there is any pressure leakage;

Step 4: The control system controls the high-pressure source component to generate high-pressure liquid and inject it into the tube blank to perform preliminary expansion of the tube blank at the seal;

Step 5: Use the shaping mold to shape the bulging tube blank;

Step 6: The high-pressure source component is loaded for a period of time according to the preset internal pressure loading path to complete the high-pressure shaping process of the tube blank. After the tube blank and the inner wall of the node forming cavity in the shaping mold are completely fitted, the internal pressure is released;

Step 7: Remove the membrane;

Step 8: Tube blank feeding;

Repeat steps two to eight until the entire forming process is completed.

Compared with the prior art, the present invention achieves the following technical effects:

The continuous hydroforming device and forming method for corrugated pipes provided by the present invention can realize the integral forming of corrugated pipes from large diameter-thickness ratio pipe blanks. Compared with rolled and welded corrugated pipes, the forming of parts in this process is not only automatically controlled by the control system, but also reduces manual work. , the product quality has good stability and consistency, and the overall forming completely eliminates the longitudinal welds under the traditional process, effectively avoiding welding defects at the corrugated boss, and improving the reliability of this type of parts.

In addition, the length of the initial bulging area can be basically consistent with the circumference of the corrugated section after forming through reasonable pre-sequential design of the bulging area length. Therefore, the thinning rate of the corrugated section of the resulting corrugated pipe is small, and the cross-sections of the overall pipe fittings are The wall thickness is evenly distributed.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the drawings of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a structural cross-sectional view of the bellows continuous hydroforming device provided in Embodiment 1;

Figure 2 is a schematic process flow diagram of the continuous hydroforming method for bellows provided in Embodiment 2;

Figure 3 is a schematic structural diagram of the activity module.

In the picture: 1-tube blank; 2-movable module; 21-axial module; 22-radial module; 23-relatively fixed module; 3-sealing component; 5-high-pressure source component; 6-control system; 7-tube Billet propulsion device; 8-radial module propulsion device.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The purpose of the present invention is to provide a bellows continuous hydroforming device and a forming method to solve the problems existing in the above-mentioned prior art and improve product quality.

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

The present invention defines the tube blank as the following structure: the cavity in the tube blank is divided into a plurality of sequentially connected sub-cavities. After the tube blank is formed into a corrugated pipe, each sub-cavity corresponds to a corrugated tube. The tube blank includes multiple sequentially connected sub-cavities. Connected sub-tube blanks, one sub-tube blank corresponds to one sub-cavity.

Embodiment 1

This embodiment provides a continuous hydroforming device for bellows, as shown in Figure 1, which is suitable for integrally forming large diameter-thickness ratio tube blanks, and includes a high-pressure source component 5, a shaping mold, a control system 6 and a sealing component 3. The sealing component 3. It can seal both axial ends of any sub-cavity and form a sealed cavity. The high-pressure source assembly 5 is connected with the sealed cavity and can pass high-pressure liquid into the sealed cavity to make the tube blank 1 initially expand and shape the mold. It is used to clamp and shape the partially bulged tube blank 1 outside the tube blank 1. The control system 6 controls the high-voltage source assembly 5 and the shaping mold.

Among them, as shown in Figure 3,

The shaping mold includes a movable module 2 and a press. The press provides mold closing pressure to the movable module 2. The movable module 2 includes an axial module 21, a radial module 22 and a relatively fixed module 23. The axial module 21, the radial module 22 and the relatively fixed module 23. The relative fixed modules 23 are arranged sequentially along the axial direction of the tube base 1. The axial module 21 moves along the axial direction of the tube base 1 for mold closing, and the radial module 22 moves along the radial direction of the tube base 1 for mold closing. After molding, the node molding cavity is jointly formed in the axial module 21 , the radial module 22 and the relative fixed module 23 . In the preferred embodiment, the axial module 21 has an annular integrated structure, the radial module 22 has an upper and lower split structure, and the two split bodies of the radial module 22 both have a semicircular ring structure. The radial movement is realized under the action of the radial module propulsion device 8; the relative fixed module 23 also has an upper and lower split structure, and the two split bodies of the relative fixed module 23 realize radial movement under the action of the fixed module propulsion device, and the radial movement is realized under the action of the radial module propulsion device 8. The distance to move in the direction is greater than the maximum wave crest height of the corrugated tube to facilitate the movement of the tube blank 1 along the axial direction. A node shaping cavity is provided in the relatively fixed module 23. The shape and size of the node shaping cavity and the node molding cavity are consistent. The shaping cavity is used to further shape the formed nodes.

An annular sealing cavity is formed between the sealing component 3 and the inner wall of the tube blank 1. A high-pressure fluid channel is provided in the sealing component 3. The high-pressure fluid channel is connected with the high-pressure source component 5. The high-pressure fluid channel is T-shaped, with one water inlet end and two The water outlet end is located on one axial side of the sealing assembly 3, and the water outlet end is located on the circumferential side wall of the sealing assembly 3 and injects high-pressure liquid into the annular sealing cavity.

A T-shaped high-pressure fluid channel is provided on any side inside the sealing component 3; the high-pressure fluid channel is connected with the high-pressure source component 5.

After each shaping is completed, the next part of the tube blank 1 is formed by moving the position of the tube blank 1, or the position of the shaping mold can be changed to achieve the purpose of shaping the next part of the tube tube 1.

The bellows continuous hydroforming device and the forming method provided by the present invention can realize the integral forming of bellows with large diameter-thickness ratio tube blanks. Compared with the rolled and welded bellows, the forming of the process parts is not only automatically controlled by the control system 6, but also reduces manual labor. operation, the stability and consistency of product quality are good, and the overall forming completely eliminates the longitudinal welds under the traditional process, effectively avoiding welding defects at the corrugated boss, and improving the reliability of this type of parts.

In some embodiments, in order to achieve continuous forming, the bellows continuous hydroforming device provided in this embodiment also includes a tube blank pushing device 7. The shaping mold is fixedly installed. The shaping mold is equipped with a shaping station, and any sub-tube blank is Can be located on the shaping station, and the tube blank pushing device 7 can push the tube blank 1 along the axial direction of the tube blank 1 to achieve the purpose of moving the next part of the tube blank to the shaping station. The tube blank pushing device 7 adopts the existing technology. Medium and mature equipment is enough.

Embodiment 2

This embodiment provides a method for continuous hydroforming of corrugated pipes. The continuous hydroforming device of corrugated pipes described in Embodiment 1 is used to sequentially perform hydroforming processing on each sub-tube blank in the tube blank 1.

Specifically, as shown in Figure 2, the continuous hydroforming method of bellows includes:

Step 1: Before forming, first determine the appropriate diameter of the tube blank 1 and select the tube blank 1 based on the forming requirements of the required target pipe fittings and the mechanical properties of the tube blank 1 material, and check the performance of the bellows continuous hydroforming device;

Step 2: Place the selected tube blank 1 in the bellows continuous hydroforming device;

Step 3: Use the sealing component 3 to seal the inside of the tube blank 1. After completing the sealing, use the control system 6 to control the high-pressure source component 5 to generate low-pressure liquid to check whether the sealing of the tube 1 is reliable and whether there is any pressure leakage;

Step 4: The control system 6 controls the high-pressure source assembly 5 to generate high-pressure liquid and inject it into the tube blank 1 to perform preliminary bulging of the tube blank 1 at the seal;

Step 5: Use the shaping mold to shape the bulging tube blank 1;

Step 6: The high-pressure source component 5 is loaded for a period of time according to the preset internal pressure loading path to complete the high-pressure shaping process of the tube blank 1. After the tube blank 1 fully fits the inner wall of the node forming cavity in the shaping mold, unload the internal pressure. pressure;

Step 7: Remove the membrane;

Step 8: Feed tube blank 1;

Repeat steps two to eight until the entire forming process is completed.

Embodiment 3

Based on the second embodiment, this embodiment provides a specific forming method.

The target pipe fitting is composed of six corrugated sections, with a total length of 790mm, a corrugation fillet of R20mm, a maximum crest diameter of Φ361mm, a basic inner diameter of Φ320mm, and a wall thickness of 2.5mm.

Step 1: Take a 5A06 aluminum alloy round tube with a total length of 904mm, an inner diameter of Φ320mm, and a wall thickness of 2.5mm as the initial tube blank 1;

Step 2: Place the tube blank 1 in the bellows continuous hydroforming device;

Step 3: Use the control system 6 to debug the high-pressure source component 5 to check whether the high-pressure source component 5 can produce high-pressure liquid normally; use the control system 6 to debug the press to check whether the press can complete the mold closing action normally; use the control system 6 to debug the tube blank 1 The moving device checks whether the moving device of the tube blank 1 can normally complete the advancement of the tube tube 1.

Step 4: Use the sealing component 3 to seal the inside of the tube 1. After completing the sealing, use the control system 6 to control the high-pressure source component 5 to generate low-pressure liquid to check whether the sealing of the tube 1 is reliable. If the seal is reliable and there is no pressure leakage, proceed to the next step. five. If pressure leakage occurs, re-seal until there is no pressure leakage and then proceed to step 4;

Step 5: The control system 6 controls the high-pressure source component 5 to generate high-pressure liquid, and the sealing component 3 injects the high-pressure liquid in the oil circuit into the tube blank 1 to perform preliminary bulging of the tube blank 1;

Step 6: The control system 6 controls the press to drive the movable module 2 to squeeze the bulging area and close it until the mold is completely closed;

Step 7: The high-pressure source component 5 is loaded according to the preset internal pressure loading path to complete the high-pressure shaping process of the tube blank 1. After the tube blank 1 and the movable module 2 form a complete fit on the inner wall of the node forming cavity, the internal pressure is unloaded. ;

Step 8: The control system 6 controls the press to drive the movable modules 2 away from the bulging area to open the mold axially; after the movable module 2 no longer constrains the bulging area, the two relatively fixed modules 23 in the movable module 2 rise and Descend to the set height to complete the film removal process;

Step 9: The control system 6 controls the tube blank propulsion device 7 to feed the next shaft segment that needs to be formed into corrugated sections to the designated position. After the two relatively fixed modules 23 are reset and closed again, repeat the above steps to achieve six corrugated sections. independently formed.

Specific examples are used in the present invention to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, based on this The idea of the invention will be subject to change in the specific implementation and scope of application. In summary, the contents of this description should not be construed as limitations of the present invention.

Claims (7)

1. A device for continuous hydroforming of bellows. The cavity in the tube blank is divided into a plurality of sequentially connected sub-cavities. After the tube blank is formed into a bellows, each of the sub-cavities corresponds to a node. , characterized by: including a high-pressure source component, a shaping mold, a control system and a sealing component. The sealing component can seal both axial ends of any of the sub-cavities and form a sealed cavity. The high-pressure source component The shaping mold is connected to the sealed cavity and can pass high-pressure liquid into the sealed cavity to preliminary expand the tube blank. The mold closing and shaping is performed externally, and the control system controls the operation of the high-voltage source assembly and the shaping mold. 2. The corrugated pipe continuous hydroforming device according to claim 1, characterized in that: the tube blank includes a plurality of sub-tube blanks connected in sequence, and one sub-tube blank corresponds to one of the sub-cavities. The tube continuous hydroforming device also includes a tube blank pushing device. The shaping mold is fixedly installed. The shaping mold is equipped with a shaping station. Any one of the sub-tube blanks can be located on the shaping station. The tube blank can be positioned on the shaping station. The billet pushing device can push the billet along the axial direction of the billet. 3. The bellows continuous hydroforming device according to claim 1, characterized in that: the shaping mold includes a movable module and a press, the press provides mold closing pressure to the movable module, the movable module includes an axial module, radial module and relatively fixed module, the axial module, the radial module and the relatively fixed module are arranged in sequence along the axial direction of the tube base, and the axial module moves along the axial direction of the tube base To perform mold closing, the radial module moves along the radial direction of the tube blank to perform mold closing. After mold closing, a node forming cavity is jointly formed in the axial module, the radial module and the relatively fixed module. . 4. The bellows continuous hydroforming device according to claim 3, characterized in that: the axial module has an annular integrated structure, the radial module has an upper and lower split structure, and the two parts of the radial module Both bodies have a semicircular annular structure, and the two separate bodies of the radial module realize radial movement under the action of the radial module propulsion device; the relatively fixed module also has an upper and lower split structure, and the relatively fixed module The two split bodies realize radial movement under the action of the fixed module propulsion device, and the distance of radial movement is greater than the maximum wave crest height of the bellows. A node shaping cavity is provided in the relatively fixed module, and the node shaping cavity is The cavity is consistent in shape and size with the node forming cavity. 5. The bellows continuous hydroforming device according to claim 1, characterized in that: an annular sealing cavity is formed between the sealing component and the inner wall of the tube blank, and a high-pressure fluid channel is provided in the sealing component. The fluid channel is connected to the high-pressure source component. A high-pressure fluid channel is provided on any side inside the sealing component. The high-pressure fluid channel is connected to the high-pressure source component. 6. A method for continuous hydroforming of corrugated pipes, characterized in that the continuous hydroforming device of bellows according to any one of claims 1 to 5 is used to sequentially perform hydroforming processing on each sub-tube blank in the pipe blank. 7. The continuous hydroforming method of bellows according to claim 6, characterized in that: Step 1: Before forming, first determine the appropriate diameter of the tube blank and select the tube blank according to the forming requirements of the required target pipe fittings and the mechanical properties of the tube blank material, and check the performance of the corrugated pipe continuous hydroforming device; Step 2: Place the selected tube blank into the corrugated tube continuous hydroforming device; Step 3: Use the sealing component to seal the inside of the tube blank. After completing the sealing, use the control system to control the high-pressure source component to generate low-pressure liquid to check whether the sealing of the tube blank is reliable and whether there is any pressure leakage; Step 4: The control system controls the high-pressure source component to generate high-pressure liquid and inject it into the tube blank to perform preliminary expansion of the tube blank at the seal; Step 5: Use the shaping mold to shape the bulging tube blank; Step 6: The high-pressure source component is loaded for a period of time according to the preset internal pressure loading path to complete the high-pressure shaping process of the tube blank. After the tube blank and the inner wall of the node forming cavity in the shaping mold are completely fitted, the internal pressure is released; Step 7: Remove the membrane; Step 8: Tube blank feeding; Repeat steps two to eight until the entire forming process is completed.