CN213256517U - Large-diameter thin-walled pipe liquid-filling bending forming device - Google Patents
Large-diameter thin-walled pipe liquid-filling bending forming device Download PDFInfo
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- CN213256517U CN213256517U CN202022035644.8U CN202022035644U CN213256517U CN 213256517 U CN213256517 U CN 213256517U CN 202022035644 U CN202022035644 U CN 202022035644U CN 213256517 U CN213256517 U CN 213256517U
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Abstract
The utility model discloses a large-diameter thin-walled tube liquid-filling bending forming device, which relates to the technical field of metal forming manufacturing and comprises an upper die, a lower die, a press machine, a sealing system and a control system; the tube blank is arranged between the upper die and the lower die; the press machine is used for controlling the die closing and die separating of the upper die and the lower die; the sealing systems are arranged at the two ends of the lower die and have the same height with the tube blank; one side of the sealing system facing the tube blank is provided with a liquid filling hole which is connected with a liquid supply system; the control system is electrically connected with the press machine, the liquid supply system and the sealing system. The upper die cavity completely enters the lower die structure to be formed, the pipe is shaped at high pressure after low-pressure preforming, and the axial movement of the pipe is restrained, so that the undercut problem in die assembly is inhibited, and the quality of a formed part is improved; the method for axially restraining the pipe and providing the liquid internal pressure by adopting the restraint between the flange and the die solves the problem of wrinkling in the bending of the large-diameter thin-wall pipe, and has the advantages of simple structure and low cost of the restraint device.
Description
Technical Field
The utility model relates to a metal forming makes technical field, especially relates to a major diameter thin wall pipe liquid filling bending forming device.
Background
The pipe bending part has unique functions in the aspects of conveying gas and liquid working media and serving as a stressed structural part, so that the pipe bending part plays an increasingly important role in the fields of aviation, aerospace, automobiles, power machinery, petrochemical industry, boilers, light industry, engineering machinery, metal structures and the like. In recent years, due to the increasing demand for lighter structural members, the applications of pipe bending parts are rapidly increasing. The bending of the pipe is obviously different from the bending of the plate, and because the pipe has the characteristics of hollow and thin wall, the bending forming processing is easy to generate the defects of wrinkling, tensile crack, change of the shape of the cross section and the like, and the wall thickness can also be changed. Therefore, the forming processing method, the application of force and bending moment, the defects of the product, the prevention measures thereof and the like are greatly different from the bending of the plate. In particular, the bending of the large-diameter thin-wall pipe is easy to crack and wrinkle, and the bending size precision, the profile precision and the surface quality of the large-diameter thin-wall pipe are seriously influenced.
As a lightweight structure, the large-diameter thin-wall bent pipe is difficult to manufacture a thin-wall pipe with the diameter of 200mm and the wall thickness of less than 3mm by traditional bending (stretch bending, push bending, press bending, roll bending and the like) including numerical control bending, and is easy to generate the defects of wrinkling, flattening, cracking and the like, and the section of the bent part is large in deformation.
The liquid-filled press bending is a pipe internal high-pressure bending forming method, firstly, the interior of a pipe blank is filled with liquid medium, then an upper die is closed, and the pipe blank is deformed under the combined action of die pressure and liquid support in the pipe. The tube blank is bent under the pressure of liquid, and because the internal pressure of the liquid can provide tangential tensile stress to offset the tangential compressive stress of the bent inner side when a part of the tube blank is bent, the bending wrinkling and section deformation tendency can be relieved, and the bending forming surface quality of the large-diameter thin-walled tube can be effectively improved.
However, the current liquid-filled press bending method for the pipe still has the following problems: (1) when the pipe has high strength and thin wall thickness, the generation of wrinkles cannot be completely inhibited by the liquid internal pressure alone; (2) when the pipe is large in diameter and high in size precision requirement, the upper die and the lower die of the die are closed, the flash is easy to occur, and the forming quality is affected.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a major diameter thin wall pipe liquid filling bending device to solve the problem that corrugate, cross-section distortion and easy production overlap that exist among the present major diameter thin wall tubular product liquid filling bending process.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a large-diameter thin-walled tube liquid-filling bending forming device, which comprises an upper die, a lower die, a press machine, a sealing system and a control system; the tube blank is arranged between the upper die and the lower die; the press machine is used for controlling the die closing and die separating of the upper die and the lower die; the sealing systems are arranged at two ends of the lower die and have the same height with the tube blank; one side of the sealing system facing the tube blank is provided with a liquid filling hole, and the liquid filling hole is connected with a liquid supply system; the control system is electrically connected with the press machine, the liquid supply system and the sealing system.
Optionally, the sealing system includes a sealing punch and a driving mechanism, the driving mechanism is electrically connected to the control system, the driving mechanism is configured to drive the sealing punch to move linearly, and the liquid filling hole is disposed on one side of the sealing punch, which faces the tube blank.
Optionally, the driving mechanism is an oil cylinder or an air cylinder or a linear motor.
Optionally, a chuck is disposed between the sealing punch and the driving mechanism.
Optionally, the liquid supply system comprises a pressure booster, an outlet end of the pressure booster is communicated with the liquid filling hole, and the pressure booster is electrically connected with the control system.
Optionally, a bottom plate is arranged on the press machine, the lower die is arranged on the bottom plate, two ends of the lower die are respectively provided with a pressing plate, the middle of each pressing plate and the tube blank are provided with limiting holes at the same height, and the limiting holes are used for positioning the tube blank.
Optionally, the pressing plate includes an upper pressing plate and a lower pressing plate, the lower pressing plate is disposed on the bottom plate and located at two ends of the lower mold, and the upper pressing plate is detachably disposed on the lower pressing plate; the limiting hole is formed by splicing grooves formed in the upper pressing plate and the lower pressing plate.
Optionally, flanges are arranged at two ends of the tube blank and located on the outer side of the pressing plate.
Optionally, an upper limiting column is respectively arranged on two sides of the upper die, and a lower limiting column is arranged on two sides of the top of the lower die and corresponds to the upper limiting column.
The utility model discloses for prior art gain following technological effect:
the utility model discloses a major diameter thin wall pipe liquid filling bending forming device, which mainly comprises an upper die, a lower die, a press machine, a sealing system and a control system; the forming is carried out by the structure that the upper die cavity completely enters the lower die, low-pressure preforming is carried out firstly, then high-pressure shaping is carried out, and the axial movement of the pipe is restrained by rigid restraint between the flange and the die. Compared with the traditional preforming mold, the mold of the utility model can effectively inhibit the undercut problem which may occur in the mold closing process, and improve the quality of the formed piece; the method for axially restraining the pipe and providing the liquid internal pressure by adopting the restraint between the flange and the die solves the problem of wrinkling easily occurring in the bending of the conventional large-diameter thin-wall pipe, and has the advantages of simple structure and low cost of the restraint device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of the liquid-filled press bending device for medium-diameter and large-diameter thin-walled tubes of the present invention, which is specifically a schematic view of the position relationship between the die and the tube blank at the initial stage;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a front view of FIG. 1;
FIG. 4 is a schematic view showing the positional relationship between the die and the tube blank at the sealing and pressurizing stage;
FIG. 5 is a schematic view showing the positional relationship between the mold and the tube blank at the mold closing stage;
FIG. 6 is a front view of FIG. 5;
FIG. 7 is a cross-sectional view taken along line A-A of FIG. 5;
FIG. 8 is a schematic view showing the positional relationship between the die and the tube blank at the stage of pressing and die attaching;
in the figure: 1-press, 2-top plate, 3-upper die, 4-right upper press plate, 5-tube blank, 6-right upper limit column, 7-right lower limit column, 8-liquid filling hole, 9-right sealing punch, 10-right oil cylinder, 11-supercharger, 12-right chuck, 13-right lower press plate, 14-control system, 15-bottom plate, 16-lower die, 17-left lower press plate, 18-left chuck, 19-left oil cylinder, 20-left sealing punch, 21-left upper press plate, 22-left lower limit column, 23-left upper limit column, 24-right flange, 25-left flange.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, the embodiment provides a liquid-filled bending forming device for a large-diameter thin-walled pipe, which comprises an upper die 3, a lower die 16, a press 1, a sealing system and a control system 14; the tube blank 5 is arranged between the upper die 3 and the lower die 16; the press machine 1 is used for controlling the die closing and die separating of the upper die 3 and the lower die 16; the sealing systems are arranged at two ends of the lower die 16 and have the same height with the tube blank 5; one side of the sealing system facing the tube blank 5 is provided with a liquid filling hole 8, and the liquid filling hole 8 is connected with a liquid supply system; the control system 14 is electrically connected with the press 1, the liquid supply system and the sealing system.
In this embodiment, a bottom plate 15 is disposed on the press machine 1, a lower die 16 is disposed on the bottom plate 15, a top plate 2 is disposed below a punch of the press machine 1, an upper die 3 is disposed at the bottom of the top plate 2, and the upper die 3 is located right above the lower die 16. After the upper mold 3 and the lower mold 16 are closed, the cavity portion inside the mold is located below the top of the lower mold 16.
Four upper limiting columns are arranged on two sides of the upper die 3 on the top plate 2, and four lower limiting columns are arranged on two sides of the top of the lower die 16 and correspond to the four upper limiting columns.
The sealing system comprises a sealing punch and a driving mechanism, the driving mechanism is electrically connected with the control system 14 and used for driving the sealing punch to linearly move, and the liquid filling hole 8 is formed in one side, facing the tube blank 5, of the sealing punch.
In this embodiment, the driving mechanism employs an oil cylinder. The sealing punch is driven by the oil cylinder to move linearly so as to realize the sealing and separation of the sealing punch to the tube blank 5.
The sealing punch comprises a left sealing punch 20 and a right sealing punch 9, and the left sealing punch 20 and the right sealing punch 9 are respectively arranged at two ends of the tube blank 5.
The end parts of both ends of the tube blank 5 are welded with a left flange 25 and a right flange 24. The outer diameters of the left flange 25 and the right flange 24 are both larger than the outer diameter of the tube blank 5. The left sealing punch 20 and the right sealing punch 9 are inserted into the left flange 25 and the right flange 24, respectively, to seal both ends of the tube blank 5. The both ends of pipe blank 5 and the tip of pipe blank 5 the same height be provided with left side hydro-cylinder 19 and right side hydro-cylinder 10, and the expansion end of left side hydro-cylinder 19 is provided with left side chuck 18, and the expansion end of right side hydro-cylinder 10 is provided with right side chuck 12, and left side chuck 18 is used for fixed left sealed drift 20, and right side chuck 12 is used for fixed right sealed drift 9 to the change of convenient sealed drift is with the pipe blank that adapts to not unidimensional.
The liquid supply system comprises a supercharger 11, the outlet end of the supercharger 11 is communicated with the liquid filling hole 8, and the supercharger 11 is electrically connected with the control system 14.
Two ends of the lower die 16 are respectively provided with a pressing plate, the middle part of the pressing plate is provided with a limiting hole at the same height with the tube blank 5, and the limiting hole is used for positioning the tube blank 5.
The pressing plates comprise an upper pressing plate and a lower pressing plate, the lower pressing plates are arranged on the bottom plate 15 and located at two ends of the lower die 16, and the upper pressing plates are detachably arranged on the lower pressing plates; the limiting hole is formed by splicing grooves formed in the upper pressing plate and the lower pressing plate. The diameter of the limiting hole is the same as the outer diameter of the tube blank 5. When the left sealing punch 20 and the right sealing punch 9 are respectively inserted into the left flange 25 and the right flange 24, the axial movement of the tube blank 5 is prevented through the limiting effect of the pressing plate, and the phenomenon that the tube wall of the tube blank 5 is wrinkled due to the fact that the tube blank is deformed in advance is avoided.
The use process of the large-diameter thin-walled tube liquid-filled bending forming device in the embodiment is as follows:
the tube blank 5 is placed on a lower die 16, two ends of the tube blank 5 are respectively positioned in grooves of a left lower pressing plate 17 and a right lower pressing plate 13, a left upper pressing plate 21 and a right upper pressing plate 4 are closed, the tube blank 5 is fixed, a control system 14 drives a left oil cylinder 19 and a right oil cylinder 10 to enable a left sealing punch 20 and a right sealing punch 9 to be respectively inserted into a left flange 25 and a right flange 24 to seal two ends of the tube blank 5, at the moment, the left flange 25 and the right flange 24 are respectively contacted with the pressing plates on the corresponding sides, liquid is filled into the tube blank 5 through a supercharger 11 and a liquid filling hole 8 and pressure is kept, a press 1 drives an upper die 3 to move downwards to enable the upper die 3 and the lower die 16 to complete die assembly, and the formed.
The utility model provides a major diameter thin wall pipe liquid filling bending device, when crooked, the device of the additional tangential tensile stress of pipe fitting axial restraines and corrugates, and the rigidity restraint through flange and pipe and mould realizes the additional tangential tensile stress of axial to reach the mesh that restraines and corrugate.
It should be noted that, as is obvious to a person skilled in the art, the invention is not limited to details of the above-described exemplary embodiments, but can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (9)
1. A large-diameter thin-walled pipe liquid-filling bending forming device is characterized by comprising an upper die, a lower die, a press machine, a sealing system and a control system; the tube blank is arranged between the upper die and the lower die; the press machine is used for controlling the die closing and die separating of the upper die and the lower die; the sealing systems are arranged at two ends of the lower die and have the same height with the tube blank; one side of the sealing system facing the tube blank is provided with a liquid filling hole, and the liquid filling hole is connected with a liquid supply system; the control system is electrically connected with the press machine, the liquid supply system and the sealing system.
2. The large-diameter thin-walled tube liquid-filled bending forming device according to claim 1, wherein the sealing system comprises a sealing punch and a driving mechanism, the driving mechanism is electrically connected with the control system and is used for driving the sealing punch to linearly move, and the liquid filling hole is formed in one side, facing the tube blank, of the sealing punch.
3. The large-diameter thin-walled tube liquid-filled bending forming device according to claim 2, wherein the driving mechanism is an oil cylinder, an air cylinder or a linear motor.
4. The large-diameter thin-walled tube hydroforming apparatus according to claim 2, wherein a chuck is disposed between the sealing punch and the drive mechanism.
5. The large-diameter thin-walled tube hydroforming device according to claim 1, wherein the liquid supply system comprises a pressure booster, an outlet end of the pressure booster is in communication with the liquid filling hole, and the pressure booster is electrically connected to the control system.
6. The large-diameter thin-walled tube liquid-filled bending forming device according to claim 2, wherein a bottom plate is arranged on the press, the lower die is arranged on the bottom plate, two ends of the lower die are respectively provided with a pressing plate, the middle part of the pressing plate is provided with a limiting hole at the same height as the tube blank, and the limiting hole is used for positioning the tube blank.
7. The large-diameter thin-walled tube liquid-filled bending forming device according to claim 6, wherein the pressing plates comprise an upper pressing plate and a lower pressing plate, the lower pressing plates are arranged on the bottom plate and located at two ends of the lower die, and the upper pressing plate is detachably arranged on the lower pressing plate; the limiting hole is formed by splicing grooves formed in the upper pressing plate and the lower pressing plate.
8. The large-diameter thin-walled tube liquid-filled bending forming device according to claim 6 or 7, wherein flanges are arranged at both ends of the tube blank, and the flanges are positioned at the outer sides of the pressure plates.
9. The large-diameter thin-walled tube liquid-filled bending forming device according to claim 1, wherein an upper limiting column is respectively arranged on two sides of the upper die, and a lower limiting column is arranged on two sides of the top of the lower die corresponding to the upper limiting column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022035644.8U CN213256517U (en) | 2020-09-17 | 2020-09-17 | Large-diameter thin-walled pipe liquid-filling bending forming device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022035644.8U CN213256517U (en) | 2020-09-17 | 2020-09-17 | Large-diameter thin-walled pipe liquid-filling bending forming device |
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| CN213256517U true CN213256517U (en) | 2021-05-25 |
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| CN202022035644.8U Active CN213256517U (en) | 2020-09-17 | 2020-09-17 | Large-diameter thin-walled pipe liquid-filling bending forming device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116984468A (en) * | 2023-09-26 | 2023-11-03 | 合肥工业大学 | Ultra-thin metal polar plate ultrasonic auxiliary accurate forming device |
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2020
- 2020-09-17 CN CN202022035644.8U patent/CN213256517U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116984468A (en) * | 2023-09-26 | 2023-11-03 | 合肥工业大学 | Ultra-thin metal polar plate ultrasonic auxiliary accurate forming device |
| CN116984468B (en) * | 2023-09-26 | 2023-12-15 | 合肥工业大学 | Ultra-thin metal polar plate ultrasonic auxiliary accurate forming device |
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