CN109834150B - Multi-wave tube hydraulic bulging forming method - Google Patents
Multi-wave tube hydraulic bulging forming method Download PDFInfo
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Abstract
The invention provides a multi-wave tube hydraulic bulging forming device and a method, which comprises a forming cylinder (1), a forming flange (2), a water injection die head sealing ring (3), a water injection die head (4), a piston sealing ring (5), a die body, a stepping cylinder piston rod (7) and a gasket (8); the forming cylinder (1) is connected with the forming flange (2), the forming flange (2) is connected with one end of the die body, the other end of the die body is connected with the gasket (8), one end of the water injection die head (4) is connected with the forming cylinder (1), the other end of the water injection die head (4) is connected with the stepping cylinder piston rod (7), a piston sealing ring (5) is arranged at the joint of the water injection die head (4) and the stepping cylinder piston rod (7), the water injection die head (4) and the stepping cylinder piston rod (7) are located in a cavity of the die body, and the water injection die head (4) is circumferentially connected with the. The invention can realize the integral forming of a plurality of corrugations, improve the forming quality of the multi-corrugated pipe and reduce the development cost.
Description
Technical Field
The invention relates to a hydraulic forming technology of metal materials, in particular to a multi-wave tube hydraulic bulging forming device and method.
Background
With the progress of the processing and manufacturing level of the aerospace industry, aerospace products gradually develop towards the direction of reducing the weight of parts and improving the reliability of the products. In the rocket body structure of the long-standing series carrier rocket storage tank, a variable-section special-shaped component is often used, wherein a plurality of wave tubes in the carrier rocket storage tank are composed of a plurality of sections of wave tubes and flange plates, and mainly play a role in conveying an oxidant and isolating a fuel agent.
As the aerospace craft has higher and higher requirements on the lightweight structure, various pipeline structural parts need to be as thin as possible under the condition of meeting the strength index. In response to the requirement, the hydraulic bulging technology of pipes appeared in the 60 s of the 20 th century. In the last 90 th century, breakthrough of high-pressure technology and application of computer control systems provided a new technical approach for integral forming of thin-walled pipes, in which m.ahmetoglu et al, ohio state university, in the united states, performed simulation and experimental studies on high-pressure forming in pipes welded by low-carbon steel, and, at the same time, they also studied the influence of weld positions on forming. The hydraulic forming technology is widely applied to the fields of carrier rockets, aviation aircrafts, ships, automobiles and the like, and is considered as one of the plastic forming technologies with the most development potential in the twenty-first century. The multi-wave tube is formed by adopting a hydraulic bulging mode, so that welding seams can be eliminated, and the quality of parts is improved.
Aiming at the problems of high labor intensity and difficult quality consistency guarantee in the corrugated pipe forming process, the invention designs the multi-corrugated pipe hydraulic bulging forming device, thereby improving the forming quality of the multi-corrugated pipe, achieving the purposes of stabilizing the process quality, effectively reducing the labor intensity of operators and improving the product percent of pass.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a multi-wave tube hydraulic bulging forming device and a method.
According to one aspect of the invention, the multi-wave tube hydraulic bulging forming device comprises a forming cylinder, a forming flange, a water injection die head sealing ring, a water injection die head, a piston sealing ring, a die body, a stepping cylinder piston rod and a gasket; the forming cylinder is connected with the forming flange, the forming flange is connected with one end of the die body, the other end of the die body is connected with the gasket, one end of the water injection die head is connected with the forming cylinder, the other end of the water injection die head is connected with the piston rod of the stepping cylinder, a piston sealing ring is arranged at the joint of the water injection die head and the piston rod of the stepping cylinder, the water injection die head and the piston rod of the stepping cylinder are located in a cavity of the die body, and the water injection die head is circumferentially.
Preferably, the forming cylinder is connected with the forming flange to provide high pressure part filling liquid.
Preferably, the water injection die head injects the high-pressure part filling liquid provided by the forming cylinder into a gap between the die body and the water injection die head.
Preferably, the water injection die head is sealed with a product through a water injection die head sealing ring, and the water injection die head is sealed with a stepping cylinder piston rod through a piston sealing ring; and the water injection die head and the stepping cylinder piston rod are fixedly connected through a bolt.
Preferably, the die body comprises a plurality of dies, each die being numbered in turn.
Preferably, the die body is divided into die positions at the corrugated ribs of the corrugated pipe, namely the connection positions between the die sheets are at the corrugated ribs of the corrugated pipe, and the number of the die sheets is designed according to the number of the corrugations on the corrugated pipe.
Preferably, the mold sheet is provided with an upper half ring and a lower half ring, the upper half ring and the lower half ring are connected to form an annular structure and are fastened and connected through screws, and the upper half ring of the mold sheet is provided with an ear ring for hoisting.
Preferably, the piston rod of the stepping cylinder is connected with a control system, and the control system controls the displacement of the piston rod of the stepping cylinder to ensure that the sealing rings of the water injection die head on the water injection die head are symmetrically distributed between the two die sheets; the forming cylinder controls movement through a control system, and successive forming of the corrugations is achieved.
According to another aspect of the invention, a multi-wave tube hydraulic bulging forming method is provided, which comprises the following steps:
step 1: preparing a tube blank, and sealing the tube blank with a PE film;
step 2: turning on a power supply, starting a pump, adjusting the pressure of a pump system to a preset pressure, and returning a stepping cylinder to a back dead center;
and step 3: selecting the type and the number of the matrixes according to the formed waveform and the wave number, mounting the lower semi-ring combination of the matrixes on equipment, and then pushing the water injection die head to the position between the first and the second matrixes at the foremost end to ensure that the sealing rings of the two water injection die heads on the water injection die head are symmetrically distributed between the two matrixes;
and 4, step 4: installing a pipe blank, installing the upper half ring of the matrix according to the corresponding number, installing a movable pressing shaft, fixing the upper half ring and the lower half ring of the matrix by using screws, pushing the forming flange forward, pressing the matrix, pushing the water injection die head forward to the initial position, and locking the matrix screws;
and 5: increasing the pressure of a forming cylinder, starting bulging forming, and relieving pressure after the first corrugation forming is finished; then the water injection die head automatically moves to the next ripple position through a control system, and the water injection die head is pressurized, expanded and circulated in sequence;
step 6: and after the forming is finished, the die sheet connecting screw is detached, the half ring on the lower die sheet is taken out, and the corrugated pipe part is taken out.
Preferably, the multi-wave tube hydraulic bulging forming device is used.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can realize integral forming of a plurality of corrugations, adopts a successive forming mode, solves the problem of large liquid volume, effectively reduces the liquid volume required by forming, improves the flexible forming of products and achieves the aim of realizing integral forming of large-size multi-wave tubes.
2. The invention can meet the forming requirements of different quantities of corrugations, is convenient to disassemble and assemble, and has better straightness after the product is formed because the multi-corrugated pipe mould adopts an integral sealing structure, thereby reducing the development cost and improving the forming quality.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an assembly view of the present invention.
FIG. 3 is a schematic diagram of the structure of a bulging formed part product made using the present invention.
The figures show that:
the device comprises a forming cylinder 1, a forming flange 2, a water injection die head sealing ring 3, a water injection die head 4, a sealing ring 5, a die sheet 6, a stepping cylinder piston rod 7 and a gasket 8.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention. In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
A multi-bellows hydraulic swaging device, comprising: the device comprises a forming cylinder 1, a forming flange 2, a water injection die head sealing ring 3, a water injection die head 4, a die sheet 6, a piston sealing ring 5, a stepping cylinder piston rod 7 and a gasket 8. One end of a forming cylinder 1 is fixed with a forming flange 2, the other end of the forming cylinder is connected with a control system, and the control system controls the telescopic motion of a water injection die head 4 to realize successive bulging corrugation forming; the water injection die head 4 is connected with a stepping cylinder piston rod 7 to realize axial movement; the water injection die head sealing rings 3 are embedded at two ends of the water injection die head to play a role in sealing; the stepping cylinder piston rod 7 is connected with a control system to control the displacement of the stepping cylinder piston rod 7. A plurality of mould sheets 6 are designed according to the number of the corrugations on the part, so that the convenience of assembling and disassembling the part is ensured, the operation time is saved, meanwhile, the surface of the formed part cannot be marked with a mould, and the mould parting surface of the mould sheets 6 is designed at the convex rib part of the corrugated pipe. Meanwhile, in order to smoothly take out the parts after forming, each die sheet 6 is designed into an upper half ring and a lower half ring, the upper half ring of each die sheet 6 is provided with an earring for hoisting, after the parts are formed, the upper half ring can be hoisted and opened through the earring so as to take out the parts, and by adopting the technical scheme, the integral forming of a plurality of corrugations can be realized, a successive forming mode is adopted, the problem of large liquid volume is solved, the forming requirements of different quantities of corrugations are met, the flexibility degree is high, and because the multi-bellows mold adopts an integral sealing structure, the straightness of the product after forming is better, and the beneficial effects of reducing the development cost, improving the forming quality and the like are achieved.
According to one aspect of the invention, a multi-wave tube hydraulic bulging forming device is provided, as shown in fig. 1, comprising a forming cylinder 1, a forming flange 2, a water injection die head sealing ring 3, a water injection die head 4, a piston sealing ring 5, a die body, a stepping cylinder piston rod 7 and a gasket 8; the forming cylinder 1 is connected with the forming flange 2, the forming flange 2 is connected with one end of the die body, the other end of the die body is connected with the gasket 8, one end of the water injection die head 4 is connected with the forming cylinder 1, the other end of the water injection die head 4 is connected with the stepping cylinder piston rod 7, a piston sealing ring 5 is arranged at the joint of the water injection die head 4 and the stepping cylinder piston rod 7, the water injection die head 4 and the stepping cylinder piston rod 7 are located in a cavity of the die body, and the water injection die head 4 is circumferentially connected with the water injection die head.
The forming cylinder 1 is connected with the forming flange 2 to provide high-pressure part filling liquid, so that the part filling liquid and high-pressure forming are realized. And the water injection die head 4 injects the high-pressure part filling liquid provided by the forming cylinder 1 into a gap between the die body and the water injection die head 4. The water injection die head 4 is sealed with a product through the water injection die head sealing ring 3, and the water injection die head 4 is sealed with the stepping cylinder piston rod 7 through the piston sealing ring 5, so that high-pressure liquid is prevented from leaking; and the water injection die head 4 and the stepping cylinder piston rod 7 are fixedly connected through a bolt.
The die body comprises a plurality of dies 6, and each die 6 is numbered in sequence. The mold splitting position of the mold body is at the corrugated convex rib position of the corrugated pipe, namely the connecting position between the mold sheets 6 is at the corrugated convex rib position of the corrugated pipe, and the number of the mold sheets 6 is designed according to the number of the corrugations on the corrugated pipe, so that the forming requirements of different numbers of corrugations are met. The die body is designed into the die sheet 6, the die parting position is at the corrugated convex rib position of the corrugated pipe, the convenience of part assembly and disassembly is ensured, the operation time is saved, and meanwhile, the surface of the formed part is ensured not to have die marks. The die 6 is arranged into an upper half ring and a lower half ring, the upper half ring and the lower half ring are connected to form an annular structure and are fixedly connected through screws, and the upper half ring of the die 6 is provided with an earring for hoisting, so that parts can be taken out smoothly after forming, and the assembly and disassembly are convenient. The stepping cylinder piston rod 7 is connected with a control system, and the control system controls the displacement of the stepping cylinder piston rod 7 to ensure that the water injection die head sealing rings 3 on the water injection die head 4 are symmetrically distributed between the two die sheets 6; the forming cylinder 1 is controlled to move by a control system, and successive forming of the corrugations is achieved.
According to another aspect of the present invention, there is provided a multi-wave tube hydraulic bulging forming method, in particular, a multi-wave tube hydraulic bulging forming method using the multi-wave tube hydraulic bulging forming apparatus, comprising the steps of:
step 1: preparing a tube blank, and sealing the tube blank with a PE film;
step 2: turning on a power supply, starting a pump, adjusting the pressure of a pump system to a preset pressure, and returning a stepping cylinder to a back dead center;
and step 3: selecting the type and the number of the matrixes 6 according to the formed waveform and the wave number, combining and mounting the lower semi-rings of the matrixes 6 on equipment, and then pushing the water injection die head 4 to the position between the first and the second matrixes 6 at the foremost end to ensure that two water injection die head sealing rings 3 on the water injection die head 4 are symmetrically distributed between the two matrixes 6;
and 4, step 4: installing a pipe blank, installing the upper half ring of the matrix 6 according to the corresponding number, installing a movable pressing shaft, fixing the upper half ring and the lower half ring of the matrix 6 by using screws, pushing the forming flange 2 forwards, pressing the matrix 6, pushing the water injection die head 4 forwards to the initial position, and locking the screws of the matrix 6;
and 5: increasing the pressure of the forming cylinder 1, starting bulging forming, and releasing pressure after the first corrugation forming is finished; then the water injection die head 4 automatically moves to the next ripple position through a control system, and is pressurized, expanded and circulated in sequence;
step 6: after the forming is finished, the connecting screw of the matrix 6 is detached, the semi-ring on the matrix 6 is removed, and the corrugated pipe part is taken out.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (1)
1. A multi-wave tube hydraulic bulging forming method is characterized in that a multi-wave tube hydraulic bulging forming device is used for forming, and the multi-wave tube hydraulic bulging forming device comprises a forming cylinder (1), a forming flange (2), a water injection die head sealing ring (3), a water injection die head (4), a piston sealing ring (5), a die body, a stepping cylinder piston rod (7) and a gasket (8); the forming cylinder (1) is connected with a forming flange (2), the forming flange (2) is connected with one end of a mold body, the other end of the mold body is connected with a gasket (8), one end of the water injection mold head (4) is connected with the forming cylinder (1), the other end of the water injection mold head (4) is connected with a stepping cylinder piston rod (7), a piston sealing ring (5) is arranged at the joint of the water injection mold head (4) and the stepping cylinder piston rod (7), the water injection mold head (4) and the stepping cylinder piston rod (7) are positioned in a cavity of the mold body, and the water injection mold head (4) is circumferentially connected with the water injection;
the die body comprises a plurality of dies (6), and each die (6) is numbered in sequence;
the die piece (6) is arranged into an upper half ring and a lower half ring, the upper half ring and the lower half ring are connected to form an annular structure and are fixedly connected through screws, and the upper half ring of the die piece (6) is provided with an earring for hoisting;
the stepping cylinder piston rod (7) is connected with a control system, the control system controls the displacement of the stepping cylinder piston rod (7) and ensures that the water injection die head sealing rings (3) on the water injection die head (4) are symmetrically distributed between the two die sheets (6); the forming cylinder (1) controls movement through a control system to realize successive forming of the corrugations;
the forming cylinder (1) is connected with the forming flange (2) to provide high-pressure part filling liquid;
the water injection die head (4) injects high-pressure part filling liquid provided by the forming cylinder (1) into a gap between the die body and the water injection die head (4);
the die parting position of the die body is arranged at the corrugated convex rib part of the corrugated pipe, namely the connecting position between the die sheets (6) is arranged at the corrugated convex rib part of the corrugated pipe, and the number of the die sheets (6) is designed according to the number of corrugations on the corrugated pipe;
the water injection die head (4) is sealed with a product through a water injection die head sealing ring (3), and the water injection die head (4) is sealed with a stepping cylinder piston rod (7) through a piston sealing ring (5); the water injection die head (4) and the stepping cylinder piston rod (7) are fixedly connected through a bolt;
the forming comprises the following steps:
step 1: preparing a tube blank, and sealing the tube blank with a PE film;
step 2: turning on a power supply, starting a pump, adjusting the pressure of a pump system to a preset pressure, and returning a stepping cylinder to a back dead center;
and step 3: selecting the type and the number of the matrixes (6) according to the formed waveform and the wave number, combining and mounting the lower semi-rings of the matrixes (6) on equipment, and then pushing the water injection die head (4) to the position between the first and the second matrixes (6) at the foremost end to ensure that two water injection die head sealing rings (3) on the water injection die head (4) are symmetrically distributed between the two matrixes (6);
and 4, step 4: installing a pipe blank, installing the upper half ring and the lower half ring of the template (6) according to the corresponding number, installing a movable pressing shaft, fixing the upper half ring and the lower half ring of the template (6) by using screws, pushing the forming flange (2) forwards, pressing the template (6), pushing the water injection die head (4) forwards to the initial position, and locking the screws of the template (6);
and 5: increasing the pressure of the forming cylinder (1), starting bulging forming, and releasing pressure after the first corrugation forming is finished; then the water injection die head (4) automatically moves to the next ripple position through a control system, and is pressurized, expanded and circulated in sequence;
step 6: after the forming is finished, the connecting screw of the matrix (6) is detached, the semi-ring on the matrix (6) is removed, and the corrugated pipe part is taken out.
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| CN110976587B (en) * | 2019-11-01 | 2020-11-24 | 哈尔滨工业大学 | Forming method and device for continuous multi-wave pipe fitting with ultra-large section difference |
| CN114192603A (en) * | 2021-12-14 | 2022-03-18 | 上海航天精密机械研究所 | Method for controlling interlayer redundancy and eliminating interlayer gap of multilayer metal corrugated pipe |
| CN114852247B (en) * | 2022-05-23 | 2023-05-26 | 江苏科技大学 | Corrugated cylindrical pressure-resistant shell and forming device and method thereof |
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| CN100489165C (en) * | 2004-06-15 | 2009-05-20 | 沈传良 | Machining mould and method for stainless reeling silk bobbin |
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| CN1349865A (en) * | 2001-10-30 | 2002-05-22 | 十堰倍力工贸有限公司 | Manufacture of corrugated metal pipe used as oil return pipe in supercharger of diesel engine |
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