Liquid-filled tube manufacturing apparatus and working method

Abstract

The application relates to the field of water expansion forming equipment, and discloses a liquid filling type elbow pipe manufacturing equipment and a working method, which comprise a forming die, a telescopic cylinder and a sealing element. Both ends of the forming die are provided with the sealing element, a communication pipe is arranged in the sealing element, the sealing element comprises a moving plug connected with the telescopic cylinder, the end of the moving plug is provided with a rigid inner plug and an outer ring sleeve, a blank can be inserted between the inner plug and the outer ring sleeve, a clamping structure and a sealing ring are arranged between the outer ring sleeve and the blank, the clamping structure clamps the blank on the inner plug, and the sealing ring seals the space between the blank and the outer ring sleeve. The liquid filling type elbow pipe manufacturing equipment and the working method realize preliminary sealing through the clamping force from outside to inside, reduce the water pressure, and further seal through the external sealing, so that the reliability of the sealing is guaranteed. On the other hand, compared with the prior art, the inner plug and the outer ring sleeve can leave a larger gap with the blank, so that the blank is convenient to insert and the equipment is convenient to operate.

Description

Technical Field

[0001] This application relates to the field of water-expanding forming equipment technology, and in particular to a liquid-filled pipe bending manufacturing equipment and working method. Background Technology

[0002] The chassis is the foundation of a car. Traditional chassis are made of very heavy welded steel plates, but with the maturity and widespread adoption of hydroforming technology, this process has made chassis lighter and stronger. Traditionally, various beams in a car chassis require stamping out many thin sheet metal parts and then welding them together. However, using hydroforming, the same beam can be formed using only a single hydroformed metal tube. A single steel tube is stronger and lighter than a welded component. The pre-formed steel tube is placed in a product mold fixed on a hydroforming machine. The high-pressure device on the hydroforming machine fills the steel tube with water from both ends and seals the ends. Then, the hydroforming machine holds the mold under pressure and increases the water pressure to 350MPa~400MPa, expanding the steel tube from the inside to form the shape of the mold cavity. After forming, the machine separates the mold and removes the workpiece.

[0003] During water expansion molding, the internal liquid pressure is relatively high, and the sealing structure at both ends of the bend is subjected to a large pressure, which can easily cause leakage. Leakage will lead to insufficient pressure, and the billet will not be able to fit tightly against the inner wall of the molding cavity when it expands, resulting in unqualified products.

[0004] Secondly, in order to ensure sealing, the gap between the sealing structure and the blank should be kept within a small range, which increases the difficulty of operation. Summary of the Invention

[0005] This application proposes a liquid-filled pipe bending manufacturing equipment and working method. By sealing both the inner and outer sides, the reliability of the seal is improved, while the matching requirements of the sealing structure and the blank are reduced, thus reducing the difficulty of operation.

[0006] To achieve the above objectives, this application adopts the following technical solution: a liquid-filled pipe bending manufacturing equipment, comprising a forming mold, a telescopic cylinder, and a sealing element. The forming mold has a forming cavity, and both ends of the forming mold are provided with sealing elements. The sealing elements are connected to the telescopic cylinder, which pushes the sealing elements to move, causing the sealing elements to block the end of the blank or leave the end of the blank. A connecting pipe is provided inside the sealing element, with one end of the connecting pipe connected to a high-pressure water source and the other end of the connecting pipe connected to a drainage structure. The sealing element includes a movable plug connected to the telescopic cylinder. The end of the movable plug has a rigid inner plug and an outer ring sleeve. The blank can be inserted between the inner plug and the outer ring sleeve. A clamping structure and a sealing ring are provided between the outer ring sleeve and the blank. The clamping structure clamps the blank to the inner plug, and the sealing ring seals the space between the blank and the outer ring sleeve.

[0007] Furthermore, the clamping structure includes an expansion member and a bullet clip. The inner wall of the outer ring sleeve is provided with an inclined surface corresponding to the expansion member. When the expansion member expands, the bullet clip clamps the blank under the action of the inclined surface, while the sealing ring seals the space between the blank and the outer ring sleeve.

[0008] Furthermore, the expansion member is an elastic water bladder, and there are two sets of bullet clips, which are respectively located on both sides of the expansion member.

[0009] Furthermore, the sealing ring is located at the root of the outer ring sleeve, and the inner bullet clip will press the sealing ring together when it moves along the inclined surface.

[0010] Furthermore, a control valve is provided on the connecting pipe, and the expansion member is connected to the connecting pipe through the connecting cavity. The connection point is located upstream of the control valve. A pressure piston is provided in the connecting cavity, and the area of ​​the end of the pressure piston facing the connecting pipe is larger than the area of ​​the end facing the expansion member.

[0011] Furthermore, the expansion member has connecting strips on both sides, and each connecting strip corresponds to one of the segments of the bullet clip. The bullet clip is pasted or hung on the connecting strip. When the expansion member contracts, the connecting strip pulls the bullet clip back and opens the bullet clip.

[0012] Furthermore, the expansion member is connected to a connecting rod via a connection port, the connecting rod is threaded to the connection port, the middle of the connecting rod is provided with a communication port, the communication port is aligned with and communicates with the communication cavity, and the connecting rod is threaded to both sides of the communication port to achieve sealing.

[0013] A method for operating a liquid-filled pipe bending manufacturing equipment includes the following steps:

[0014] S1. Perform pipe bending according to process requirements;

[0015] S2. The robot feeds the bent pipe to the preforming press to preform the workpiece;

[0016] S3. The robot feeds the pre-formed workpiece to the liquid-filled pipe bending manufacturing equipment, and the workpiece is quickly formed. After forming, the workpiece is unloaded by the unloading belt conveyor, completing one processing cycle.

[0017] The beneficial effects of this invention are:

[0018] This application provides a liquid-filled bend manufacturing equipment and working method. On the one hand, during sealing, a preliminary seal is first achieved through an outside-to-inside clamping force to reduce water pressure, and then a further seal is achieved through an external seal to ensure the reliability of the seal. On the other hand, the sealing pressure changes with the water pressure to ensure that the sealing pressure is always at a low level, thereby improving the service life of the sealing structure.

[0019] This application achieves final sealing through multiple seals. In comparison, the inner plug and outer ring can leave a larger gap with the billet, which facilitates the insertion of the billet and the operation of the equipment. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles of the embodiments disclosed in this application.

[0021] Referring to the accompanying drawings and the following detailed description, the embodiments disclosed in this application can be understood more clearly, wherein:

[0022] Figure 1 This is a front view of the seal in this invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the sealing element in this invention;

[0025] Figure 4 This is a schematic diagram of the expansion component and the bullet clip in this invention;

[0026] Figure 5 This is a schematic diagram of the expansion member and connecting strip in this invention;

[0027] Figure 6 For the present invention Figure 1 A magnified view of A in the middle.

[0028] In the diagram: 1. Molding mold; 2. Telescopic cylinder; 3. Seal; 31. Moving plug; 32. Connecting pipe; 33. Control valve; 34. Expansion component; 35. Bullet clip; 36. Sealing ring; 37. Connecting rod; 38. Internal plug; 39. Outer ring sleeve; 310. Pressurizing piston; 311. Connecting cavity; 312. Connecting strip. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example 1

[0030] Please see Figures 1-4A liquid-filled pipe bending manufacturing equipment includes a forming mold 1, a telescopic cylinder 2, and a sealing element 3. The forming mold 1 consists of two templates, each with a cavity. When the two templates are closed, they form a forming cavity. After pre-forming, the blank further expands and forms in the forming cavity. The closing pressure of the two templates can be provided by a press, or the mold can be closed by fixing with bolts. Both ends of the forming mold 1 are provided with sealing elements 3. The sealing elements 3 are connected to the telescopic cylinder 2. The telescopic cylinder 2 pushes the sealing elements 3 to move, so that the sealing elements 3 seal the end of the blank or leave the end of the blank.

[0031] The sealing element 3 includes a movable plug 31 connected to the telescopic cylinder 2. The end of the movable plug 31 has a rigid inner plug 38 and an outer ring 39. The inner plug 38 is inserted into the blank from the end, and the outer ring 39 covers the blank from the end. A clamping structure and a sealing ring 36 are provided between the outer ring 39 and the blank. The clamping structure clamps the blank to the inner plug 38, and the sealing ring 36 seals the space between the blank and the outer ring 39. Although the sealing effect between the blank and the inner plug 38 is poor and leakage occurs, the pressure will be greatly reduced after the liquid passes through the clamping point between the inner plug 38 and the blank, ensuring that the sealing ring 36 can achieve a better sealing effect. The sealing element 3 is provided with a connecting pipe 32. One end of the connecting pipe 32 is connected to a high-pressure water source, and the other end of the connecting pipe 32 is connected to a drainage structure. In this embodiment, the connecting pipe 32 is led out from the side and connected to the high-pressure water source or the drainage structure.

[0032] The clamping structure includes an expansion member 34 and a bullet clip 35. The inner wall of the outer ring 39 is provided with an inclined surface corresponding to the expansion member 34. The bullet clip 35 has multiple identical clamping flaps. When the expansion member 34 expands, the bullet clip 35 clamps the blank under the action of the inclined surface. The excess part of the blank relative to the inner plug 38 protrudes slightly between the two flaps of the bullet clip and is clamped by the two flaps, ensuring a tight state between the blank and the inner plug 38 and reducing the pressure of the liquid after passing through the clamping point.

[0033] The expansion element 34 is a water bladder, and there are two sets of bullet clips 35, which are located on both sides of the expansion element 34. When the expansion element 34 expands, it forms three seals under the action of the two bullet clips 35 and the expansion element 34, achieving effective sealing and reducing water pressure.

[0034] The sealing ring 36 is located at the root of the outer ring sleeve 39, at the end of the inclined surface. The inner bullet clip 35 will simultaneously press the sealing ring 36 to ensure a sealed state.

[0035] A control valve 33 is provided on the connecting pipe 32. The expansion member 34 is connected to the connecting pipe 32 through the connecting cavity 311. The connection point is located upstream of the control valve 33. A pressure piston 310 is provided in the connecting cavity 311. The area of ​​the end of the pressure piston 310 facing the connecting pipe 32 is larger than that of the end facing the expansion member 34. The pressure piston 310 has a pressurizing effect, so that the pressure of the expansion member 34 is proportional to the water pressure and increases with the increase of water pressure. The sealing and clamping pressure is kept appropriate, which increases the service life of the corresponding structure.

[0036] Please see Figure 5 Both sides of the expansion member 34 are provided with connecting strips 312. Each connecting strip 312 corresponds to each petal of the bullet clip 35. The bullet clip 35 is pasted or hung on the connecting strip 312. When the expansion member 34 shrinks, the connecting strip 312 pulls the bullet clip 35 back and opens the bullet clip 35, making it easier for the blank to pass through the bullet clip 35.

[0037] Please see Figure 6 The expansion member 34 is connected to a connecting rod 37 via a connecting port. The connecting rod 37 is threaded to the connecting port. The middle part of the connecting rod 37 has a connecting port, which is aligned with and connected to the connecting cavity 311. Both sides of the connecting port are threaded. The movable plug 31 has a corresponding threaded hole corresponding to the position of the connecting rod 37 to ensure that the pressure in the connecting cavity 311 will not leak. The connecting rod 37 is connected to the high-pressure water source and drainage structure through a two-position three-way valve. When replacing the expansion member 34, the expansion member 34 is inserted and rotated to align the connecting port with the installation position of the connecting rod 37. The connecting rod 37 is screwed in and connected to the connecting port of the expansion member 34. At the same time, the connecting port is aligned with the pressure piston 310 for easy installation.

[0038] The preformed blank is placed in the forming mold 1. The telescopic cylinder 2 extends to orient the sealing element 3 to the end of the blank. The blank is inserted into the sealing element 3 and is inserted between the outer ring sleeve 39 and the inner plug 38. High-pressure water is injected into the connecting rod 37, and the expansion element 34 expands. After the expansion element 34 expands, it pushes the bullet clip 35. Both the bullet clip 35 and the expansion element 34 clamp the blank. Then, the connecting pipe 32 is connected to the high-pressure water source. The pressurizing piston 310 moves to further clamp the bullet clip 35 and the expansion element 34 and increase the sealing pressure of the sealing ring 36. The control valve 33 is opened, and high-pressure water enters the blank and expands, completing the water expansion forming. Example 2

[0039] A method for operating a liquid-filled pipe bending manufacturing equipment includes the following steps:

[0040] S1. Perform pipe bending according to process requirements;

[0041] S2. The robot feeds the bent pipe to the preforming press to preform the workpiece;

[0042] S3. The robot feeds the pre-formed workpiece to the liquid-filled pipe bending manufacturing equipment, and the workpiece is quickly formed. After forming, the workpiece is unloaded by the unloading belt conveyor, completing one processing cycle.

Claims

1. A liquid-filled bend manufacturing equipment, comprising a forming mold (1), a telescopic cylinder (2), and a sealing element (3), wherein the forming mold (1) has a forming cavity, and both ends of the forming mold (1) are provided with sealing elements (3), the sealing elements (3) are connected to the telescopic cylinder (2), the telescopic cylinder (2) pushes the sealing elements (3) to move, so that the sealing elements (3) seal the end of the blank or leave the end of the blank, and a connecting pipe (32) is provided inside the sealing element (3), one end of the connecting pipe (32) is connected to a high-pressure water source, and the other end of the connecting pipe (32) is connected to a drainage structure, characterized in that: The sealing element (3) includes a movable plug (31) connected to the telescopic cylinder (2). The end of the movable plug (31) has a rigid inner plug (38) and an outer ring sleeve (39). The blank can be inserted between the inner plug (38) and the outer ring sleeve (39). A clamping structure and a sealing ring (36) are provided between the outer ring sleeve (39) and the blank. The clamping structure clamps the blank to the inner plug (38), and the sealing ring (36) seals the space between the blank and the outer ring sleeve (39). The clamping structure includes an expansion element (34) and a bullet clip (35). The inner wall of the outer ring sleeve (39) is provided with a slope corresponding to the expansion element (34). The bullet clip (35) has multiple identical The clamping flap is provided. The expansion member (34) is an elastic water bladder. There are two sets of bullet clips (35), which are respectively located on both sides of the expansion member (34). The sealing ring (36) is located at the root of the outer ring sleeve (39). When the inner bullet clip (35) moves along the inclined plane, it will press the sealing ring (36). The connecting pipe (32) is provided with a control valve (33). The expansion member (34) is connected to the connecting pipe (32) through the connecting cavity (311). The connection point is located upstream of the control valve (33). The connecting cavity (311) is provided with a pressure piston (310). The area of ​​the end of the pressure piston (310) facing the connecting pipe (32) is larger than that of the end facing the expansion member (34). When the expansion member (34) expands, the bullet clip (35) clamps the blank under the action of the inclined plane, and at the same time, the sealing ring (36) seals the space between the blank and the outer ring sleeve (39).

2. The liquid-filled pipe bending manufacturing equipment according to claim 1, characterized in that, The expansion member (34) is provided with connecting strips (312) on both sides. Each connecting strip (312) corresponds to each petal of the bullet clip (35). The bullet clip (35) is pasted or hung on the connecting strip (312). When the expansion member (34) contracts, the connecting strip (312) pulls the bullet clip (35) back and causes the bullet clip (35) to open.

3. The liquid-filled pipe bending manufacturing equipment according to claim 1, characterized in that, The expansion member (34) is connected to a connecting rod (37) through a connecting port. The connecting rod (37) is threaded to the connecting port. The middle part of the connecting rod (37) is provided with a communication port. The communication port is aligned with and connected to the communication cavity (311). The connecting rod (37) is sealed by threaded connection on both sides of the communication port.

4. A working method for a liquid-filled pipe bending manufacturing equipment, comprising the following steps: S1. Perform pipe bending according to process requirements; S2. The robot feeds the bent pipe to the preforming press to preform the workpiece; Its features are, It also includes the following steps: S3. The robot feeds the pre-formed workpiece to a liquid-filled pipe bending manufacturing equipment as described in any one of claims 1-3. The workpiece is quickly formed, and after forming, the workpiece is unloaded by the unloading belt conveyor, completing one processing cycle.

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