CN103658294B - A kind of forming high pressure in pipe method - Google Patents
A kind of forming high pressure in pipe method Download PDFInfo
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- CN103658294B CN103658294B CN201310750506.XA CN201310750506A CN103658294B CN 103658294 B CN103658294 B CN 103658294B CN 201310750506 A CN201310750506 A CN 201310750506A CN 103658294 B CN103658294 B CN 103658294B
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Abstract
The invention discloses a kind of forming high pressure in pipe method, comprise the following steps: first tubing is put in the die cavity of the pipe fitting to be formed of counterdie, drive sealing punch to enter the two ends of tubing by thruster cylinder, complete pipe end sealing; Patrix is driven by the slide block of clamping pressure machine, goes downwards to the height that distance counterdie is certain, passes into highly pressurised liquid, and tubing internal pressure and patrix stroke are matched, until complete matched moulds to tubing inside; Pressurize or suitably raising pressure carry out shaping to pipe fitting.The present invention utilizes mold clamping force to promote that straight section material moves to the displacement of shaping dies fillet part, thus the pressure significantly reduced needed for fillet regions, while meeting heavy wall pipe high strength steel pipe fitting forming requirements, reduce the requirement to bearing capacity, the reliability of hermetically-sealed construction and the pressure of booster needed for the maximum tonnage of clamping pressure machine, mould, thus reduction production cost, and it is even to contribute to tube wall thickness, avoids the wall thickness excessive thinning in forming process and cracking.
Description
Technical field
The invention belongs to tubular member plastic forming technology field, especially. relate to a kind of forming high pressure in pipe method.
Background technology
Tube Hydroforming (also known as internal high pressure forming) is a kind of advanced manufacturing technology manufacturing hollow integral component, compared with the hollow unit manufacturing process of welding after traditional first punching press, there is obvious advantage, the strength and stiffness of part while reducing costs, can be improved.Schuler company of Germany is according to the statistical analysis of applying hydroformed part, and the production cost of hydroforming part on average reduces by 15% ~ 20% than stamping parts, die cost reduction by 20% ~ 30%.Therefore manufacture field at automobile, Aeronautics and Astronautics, obtain and apply more widely.Especially, in automobile production, as the subframe and dashboard cross member etc. of car, all within gradually, high pressure hydroforming method substitutes original traditional diamond-making technique.At present, many famous motor corporations generally have employed this technology in the world, and industrial production pressure used reaches 400MPa.
Existing Internal High Pressure Forming is after the complete matched moulds of upper die and lower die, sealing punch carry out end sealing then internal pressurization form, if inside parts fillet is very little, or part wall thickness is very large, pressure needed for part forming will enlarge markedly, along with the expansion of internal high pressure forming part range of application, the increase of tube wall thickness and the application of high strength linepipe, forming pressure will improve further, so just to the maximum tonnage of clamping pressure machine, bearing capacity needed for mould, the reliability of hermetically-sealed construction and the pressure of booster etc. propose higher requirement, thus increase production cost, some parts can not be produced under existing equipment ability.Therefore, reducing forming pressure is the important channel reducing internal high pressure forming part cost.
Summary of the invention
For solving the problems referred to above that prior art exists, the present invention will propose a kind of forming high pressure in pipe method that can reduce forming pressure.
To achieve these goals, technical scheme of the present invention is as follows: a kind of forming high pressure in pipe method, large-scale internal high pressure forming mould is adopted to be shaped, described large-scale internal high pressure forming mould comprises upper die and lower die, 2 sealing punch, 2 thruster cylinders, water inlet pipe and outlet pipes, and described manufacturing process comprises the following steps:
A, first tubing is put in the die cavity of pipe fitting to be formed of counterdie, drive sealing punch to enter the two ends of tubing by thruster cylinder, complete pipe end sealing;
B, patrix are driven by the slide block of clamping pressure machine, go downwards to the height that distance counterdie is certain, pass into highly pressurised liquid, and tubing internal pressure and patrix stroke are matched, until complete matched moulds to tubing inside;
The method that described tubing internal pressure and patrix stroke match refers to that the distance H between tubing internal pressure and upper die and lower die should meet following formula when passing into highly pressurised liquid to tubing inside:
In formula: P is tubing internal pressure, t is tube wall thickness, and H is the distance between upper die and lower die;
C, pressurize or the suitable pressure that improves carry out shaping to pipe fitting.
The perimeter of section of pipe fitting of the present invention is 1.0-1.4 times of tubing girth, under the prerequisite meeting instructions for use, chooses less multiple as far as possible.
Compared with prior art, the present invention has following beneficial effect:
1, in the present invention, tubing is under interior pressure effect, utilize mold clamping force to promote that straight section material moves to the displacement of shaping dies fillet part, thus the pressure significantly reduced needed for fillet regions, while meeting heavy wall pipe high strength steel pipe fitting forming requirements, reduce the requirement to bearing capacity, the reliability of hermetically-sealed construction and the pressure of booster needed for the maximum tonnage of clamping pressure machine, mould, thus reduction production cost, and it is even to contribute to tube wall thickness, avoids the wall thickness excessive thinning in forming process and cracking.
2, the distance H between tubing internal pressure of the present invention and upper die and lower die keeps rational matching relationship, presses through height in avoiding, and produces overlap in position, die sinking face.
Accompanying drawing explanation
The present invention has 7, accompanying drawing, wherein:
Fig. 1 is embodiments of the invention 1 shaping dies schematic diagram.
Fig. 2 is that embodiments of the invention 1 inside starts pressurizing mold position view.
Fig. 3 is the final shaped profile of embodiments of the invention 1 part.
Fig. 4 is embodiments of the invention 2 shaping dies schematic diagram.
Fig. 5 is that embodiments of the invention 2 inside starts pressurizing mold position view.
Fig. 6 is the final shaped profile of embodiments of the invention 2 part.
Fig. 7 is flow chart of the present invention.
In figure: 1-patrix; 2-tubing; 3-counterdie; 4-pipe fitting.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further.As shown in Fig. 1,7, a kind of tubing 2 inside high-pressure forming method, adopt large-scale internal high pressure forming mould to be shaped, described large-scale internal high pressure forming mould comprises patrix 1, counterdie 3,2 sealing punch, 2 thruster cylinders, water inlet pipe and outlet pipes, and described manufacturing process comprises the following steps:
A, first tubing 2 is put in the die cavity of pipe fitting to be formed 4 of counterdie 3, drive sealing punch to enter the two ends of tubing 2 by thruster cylinder, complete tubing 2 end part seal;
B, patrix 1 are driven by the slide block of clamping pressure machine, go downwards to the height that distance counterdie 3 is certain, pass into highly pressurised liquid, and tubing 2 internal pressure and patrix 1 stroke are matched, until complete matched moulds to tubing 2 inside;
The method that described tubing 2 internal pressure and patrix 1 stroke match refers to that tubing 2 internal pressure and the distance H between patrix 1 and counterdie 3 should meet following formula when passing into highly pressurised liquid to tubing 2 inside:
In formula: P is tubing 2 internal pressure, t is tubing 2 wall thickness, and H is the distance between patrix 1 and counterdie 3;
C, pressurize or the suitable pressure that improves carry out shaping to pipe fitting 4.
The perimeter of section of pipe fitting 4 of the present invention is 1.0-1.4 times of tubing 2 girth, under the prerequisite meeting instructions for use, chooses less multiple as far as possible.
Below by embodiment, the present invention is described further.
Embodiment 1: tubing 2 material is 304 stainless steels, diameter is 60mm, and thickness is 2mm, and the perimeter of section of formation of parts is 1.3 times of tubing 2 girth, as shown in Figure 1.Adopt traditional inside high-pressure forming method, forming pressure is 250MPa, formation of parts least radius 6mm, minimum wall thickness (MINI W.) 1.29mm.Adopt tubing 2 inside high-pressure forming method of the present invention to form testpieces, forming process is as follows:
When the spacing H of patrix 1 and counterdie 3 is 15mm, apply initial internal pressure 50Mpa (as shown in Figure 2), until complete matched moulds, meanwhile, interior line ball is loaded on 200MPa, and after complete matched moulds, shaping pressure linear loading is to 250MPa.The least radius r of final formation of parts is 6mm, and minimum wall thickness (MINI W.) is 1.44mm (as shown in Figure 3).
Embodiment 2: tubing 2 material is 304 stainless steels, diameter is 60mm, and thickness is 2mm, and the perimeter of section of formation of parts is 1.1 times of tubing 2 girth, as shown in Figure 4.Adopt traditional inside high-pressure forming method, forming pressure is 200MPa, and formation of parts least radius r is 7mm, and the minimum wall thickness (MINI W.) of its correspondence is 1.82mm.Adopt low-pressure inside high-pressure forming method of the present invention to form testpieces, forming process is as follows:
When the spacing H of patrix 1 and counterdie 3 is 10mm (as shown in Figure 5), apply initial internal pressure 50MPa, until complete matched moulds, meanwhile, interior line ball is loaded on 100MPa, and after complete matched moulds, shaping pressure remains 100MPa.The least radius r of final formation of parts is 5mm, the minimum wall thickness (MINI W.) of its correspondence be 1.89mm(as shown in Figure 6).
Claims (2)
1. a forming high pressure in pipe method, large-scale internal high pressure forming mould is adopted to be shaped, described large-scale internal high pressure forming mould comprises patrix (1), counterdie (3), 2 sealing punch, 2 thruster cylinders, water inlet pipe and outlet pipes, it is characterized in that: described manufacturing process comprises the following steps:
A, first tubing (2) is put in the die cavity of pipe fitting to be formed (4) of counterdie (3), drive sealing punch to enter the two ends of tubing (2) by thruster cylinder, complete tubing (2) end part seal;
B, patrix (1) are driven by the slide block of clamping pressure machine, go downwards to the height that distance counterdie (3) is certain, pass into highly pressurised liquid, and tubing (2) internal pressure and patrix (1) stroke are matched, until complete matched moulds to tubing (2) inside;
The method that described tubing (2) internal pressure and patrix (1) stroke match refers to that tubing (2) internal pressure and the distance H between patrix (1) and counterdie (3) should meet following formula when passing into highly pressurised liquid to tubing (2) inside:
In formula: P is tubing (2) internal pressure, t is tubing (2) wall thickness, and H is the distance between patrix (1) and counterdie (3);
C, pressurize or the suitable pressure that improves carry out shaping to pipe fitting (4).
2. a kind of forming high pressure in pipe method according to claim 1, large-scale internal high pressure forming mould is adopted to be shaped, described large-scale internal high pressure forming mould comprises patrix (1), counterdie (3), 2 sealing punch, 2 thruster cylinders, water inlet pipe and outlet pipes, it is characterized in that: the perimeter of section of described pipe fitting (4) is 1.0-1.4 times of tubing (2) girth, under the prerequisite meeting instructions for use, choose less multiple as far as possible.
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| CN201310750506.XA CN103658294B (en) | 2013-12-31 | 2013-12-31 | A kind of forming high pressure in pipe method |
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| CN201310750506.XA CN103658294B (en) | 2013-12-31 | 2013-12-31 | A kind of forming high pressure in pipe method |
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| CN103658294B true CN103658294B (en) | 2015-10-28 |
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| CN105522030A (en) * | 2014-09-29 | 2016-04-27 | 宝山钢铁股份有限公司 | Hydraulic forming method for pipe |
| CN106311857B (en) | 2015-12-21 | 2017-11-07 | 青岛世冠装备科技有限公司 | A kind of swollen manufacturing process of complex section hollow member low pressure upsetting |
| CN105834273B (en) * | 2016-03-30 | 2017-12-05 | 成霖企业股份有限公司 | A kind of pipe fitting shaped by fluid pressure method |
| CN107159771A (en) * | 2017-07-20 | 2017-09-15 | 江苏省常熟环通实业有限公司 | A kind of internal high pressure forming processing method of odd-shaped cross section hollow steel pipe |
| CN107363480A (en) * | 2017-07-20 | 2017-11-21 | 江苏省常熟环通实业有限公司 | A kind of front anticollision beam of automobile steel and its heteromorphosis forming method |
| CN110153267A (en) * | 2019-07-02 | 2019-08-23 | 哈尔滨理工大学 | A kind of manufacturing process of the special process part based on the forming of pipe internal-filling liquid |
| CN111112431B (en) * | 2019-12-20 | 2022-01-04 | 中国航发南方工业有限公司 | Method for liquid-filled extrusion forming and blade obtained thereby |
| CN113020391B (en) * | 2021-03-04 | 2022-05-03 | 北京航空航天大学 | Ultrahigh-pressure forming method and device for high-temperature alloy fluid medium |
| CN115647203A (en) * | 2022-11-14 | 2023-01-31 | 海宁正轩汽车轻量化零部件有限公司 | Manufacturing process of automobile beam |
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| JPH10175028A (en) * | 1996-12-18 | 1998-06-30 | Nippon Steel Corp | Highly accurate forming method of metallic tube by hydro-forming method |
| JP4119557B2 (en) * | 1999-03-03 | 2008-07-16 | 新日本製鐵株式会社 | Axial pressing method |
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| US5735156A (en) * | 1994-09-20 | 1998-04-07 | Hitachi, Ltd. | Method and apparatus for forming a non-circular pipe |
| DE10014619A1 (en) * | 1999-03-26 | 2000-10-05 | Nissan Motor | Hydraulic forming process to form e.g. A-columns from tubular blanks uses hollow forming mold to hold blank filled with pressurized hydraulic fluid, and forming die pressed against blank |
| CN1440842A (en) * | 2002-02-27 | 2003-09-10 | 长春汽车材料研究所 | Inner high pressure and reducing formation process of automobile axle shell |
| CN101507996A (en) * | 2009-03-23 | 2009-08-19 | 哈尔滨工业大学 | Quick determination method of load path of fittings hydraulic formation |
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