CN103920788A - Differential pressure forming method for local large-deformation hollow pieces - Google Patents
Differential pressure forming method for local large-deformation hollow pieces Download PDFInfo
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- CN103920788A CN103920788A CN201410132719.0A CN201410132719A CN103920788A CN 103920788 A CN103920788 A CN 103920788A CN 201410132719 A CN201410132719 A CN 201410132719A CN 103920788 A CN103920788 A CN 103920788A
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Abstract
The invention discloses a differential pressure forming method for local large-deformation hollow pieces and belongs to the technical field of manufacturing of metal hollow members. The differential pressure forming method includes steps of firstly placing a pipe billet into a rear die, loading a punch into the pipe billet and sealing; injecting high-pressure liquid to the inner and outer surfaces of the pipe billet at the same time, keeping pressure in the pipe billet larger than the pressure of the outer surface of the pipe billet and forming controllable pressure difference; pushing the punch to axially feed to realize material supplement by the aid of a hydraulic cylinder, and enabling the pipe billet to generate local large deformation under the action of inside and outside hydraulic differential pressure; finally, discharging the high-pressure liquid and obtaining a local large-deformation hollow piece. By controlling inside and outside pressure difference of the pipe billet, stress state during local expansion of the pipe billet can be improved, expansion can be sufficiently realized and expansion limit is increased. Hydraulic oil is injected onto the outer surface of the pipe billet, lubricating between the outer surface of the pipe billet and a form cavity of the die is evidently improved, friction is reduced, and axial supplement and final forming are facilitated.
Description
Technical field
The present invention relates to the differential pressure manufacturing process of a kind of differential pressure manufacturing process of hollow object, particularly a kind of local large deformation hollow object, belong to metal hollow member manufacturing technology field.
Background technology
Hydraulic expanding-forming technology, because forming efficiency is high, is the conventional means of manufacturing hollow structural component.By hydraulic expanding-forming technology, can obtain the hollow structural component of cross section complexity, it is able to extensive use at engineering fields such as Aero-Space, nuclear power, petrochemical industry.
Along with the develop rapidly of hydroforming technology, the hollow structural component with local large deformation feature is more and more.Local large deformation refers to that partial cross section's expansion rate far exceeds the percentage elongation of material.In hydraulic bulging process, if the control of bulging process parameter is improper, the problem that easily causes part to be burst.Realizing at present the local large expanding method of pipe mainly comprises: (1), by optimizing pressure-loaded path, forming process is implemented to optimize, to realize local large expansion of pipe; (2), adopt fluctuation loading method, in forming process, reduce frictional force between pipe surface and mold cavity to realize smooth feed supplement; (3), adopt rigid balancing drift to change the stress state of pipe in Bulging Process, to improve its forming limit.The method is applied in the Bulging Process of multi-way pipe fitting, has important function for the local reduction that improves arm.
On August 28th, 2013, Chinese invention patent CN 102248058 B disclose a kind of process that improves high pressure forming limit in tube, and it to by the region feeding of large deformation occurs, forms useful wrinkle by advance, rear employing high pressure is launched, to meet the demand of large swell increment to feed supplement.
On June 2nd, 2010, Chinese invention patent CN 101219451 A disclose a kind of long tube part forming method with local crowning shape, and it adopts the method for local heat to improve the plasticity of pipe, the larger deflection of final realization.
Said method can be alleviated cracking that pipe may occur in local large deformation or the problem of excessive thinning to a certain extent, but cannot solve the moulding problem of differential expansion rate excessive (local bulging amount is the more than 2 times of material percentage elongation).There is good effect although improve the stress state of pipe in Bulging Process by the structure optimization of formation of parts, but when local aximal deformation value is not to concentrate on a place (as how logical), but in the time of circumferential continuous distributed, balance drift will be difficult to play a role, and mould structure is complex, thereby manufacturing cost is sharply increased.
Summary of the invention
Technical problem to be solved by this invention is to overcome above-mentioned defect, and the differential pressure manufacturing process that a kind of operative installations is simple, be suitable for the hollow object how logical, shaping differential expansion rate is large is provided.
In order to solve the problems of the technologies described above, the invention provides a kind of differential pressure manufacturing process of local large deformation hollow object, specifically comprise the following steps:
1), pipe is inserted in mould, after matched moulds, seal with drift;
2), after the inside and outside injection highly pressurised liquid of pipe, pressurize respectively, and make the pressure of pipe inside be greater than external pressure, mineralization pressure is poor;
3), promote drift axial feed and realize feed supplement, under the differential pressure effect of inside and outside hydraulic pressure, make pipe produce local large deformation simultaneously;
4), discharge highly pressurised liquid, finally obtain needed local large deformation hollow object.
In the present invention, described step 2) pressurization pressure control process is: the hydraulic pressure that the hydraulic pressure in pipe is risen to outside 40-60MPa, pipe rises to 3-7MPa, then slowly increase the inside and outside hydraulic pressure of pipe, make the hydraulic pressure in pipe maintain 45-65MPa, hydraulic pressure outside pipe maintains 5-10MPa, keeps the pressure differential of inside and outside 35-60MPa of pipe.
In the present invention, described pipe inner high voltage liquid is water or hydraulic oil.
In the present invention, the outer highly pressurised liquid of described pipe is hydraulic oil.
In the present invention, described pipe is monometallic pipe or bimetal clad pipe blank.
Beneficial effect of the present invention is: (1), the present invention are poor by controlling pipe external and internal pressure, and the stress state while improving the local bulging of pipe makes the Bulging Process can be abundant, has improved its bulging limit; (2), the present invention is by the hydraulic oil injecting at outer surface of tube blank (being in mould), significantly improved lubricated between outer surface of tube blank and mold cavity, reduced friction, facilitated feed supplement and final shaping; (3), the building mortion of the present invention's use is simple in structure, shaping cost is lower.
Brief description of the drawings
The flow chart of the differential pressure manufacturing process of the local large deformation hollow object of Fig. 1 the present invention;
The differential pressure bulging schematic diagram of the differential pressure manufacturing process of the bright local large deformation hollow object of Fig. 2;
Fig. 3 invents the partial lubrication schematic diagram of the differential pressure manufacturing process of local large deformation hollow object;
Fig. 4 invents the guiding fluid schematic diagram of the differential pressure manufacturing process of local large deformation hollow object;
The differential pressure curve synoptic diagram of Fig. 5 inventive embodiments 1.
Detailed description of the invention
Below in conjunction with accompanying drawing 1 to 5, taking the protruding hollow object that is shaped, stepped reducer pipe fitting and tee pipe fitting as specific embodiment, the present invention is elaborated.
embodiment 1
The first step is 50mm, long for putting into convex mold 1, upper and lower mould matched moulds after 304 stainless steel pipe 2 removing surfaces that are 2mm of 300mm, wall thickness by diameter;
Second step, packs drift 3 in pipe into and seals;
The 3rd step, to pipe 2 inside with to outer surface of tube blank (being mould 1 inside) injection liquid force feed 4 simultaneously, the hydraulic pressure rapidly hydraulic pressure in pipe 2 being increased to outside 45MPa, pipe 2 increases to 7MPa, then slowly increase the inside and outside hydraulic pressure of pipe 2 simultaneously, the hydraulic pressure of controlling in pipe 2 maintains 50MPa substantially at working stage, hydraulic pressure outside pipe 2 maintains 10MPa substantially at working stage, and control pipe is interior, mould 1 internal pressure differences is 40MPa;
The 4th step, utilizes Hydraulic Cylinder drift 3 axial feeds to realize feed supplement, under the differential pressure effect of inside and outside hydraulic pressure, makes pipe 2 produce local large deformation;
The 5th step, discharges highly pressurised liquid, and spherical hollow object is taken out from mould, finally obtains partial cross section's expansion rate and reaches 60% ball bumps hollow object.
embodiment 2
The first step is that 40mm, length are to put into stepped mould, upper and lower mould matched moulds after the 20 steel pipe base removing surfaces of 500 mm, wall thickness 2mm by diameter;
Second step, packs drift in pipe into and seals;
The 3rd step, inner and inject highly pressurised liquid to outer surface of tube blank (being mould inside) to pipe simultaneously, the hydraulic pressure rapidly hydraulic pressure in pipe being increased to outside 40MPa, pipe increases to 7MPa, then slowly increase the inside and outside hydraulic pressure of pipe, the hydraulic pressure of controlling in pipe maintains 45MPa substantially at working stage, hydraulic pressure outside pipe maintains 10MPa substantially at working stage, and controlling the inside and outside pressure differential of pipe is 35MPa;
The 4th step, utilizes Hydraulic Cylinder drift axial feed to realize feed supplement, under the differential pressure effect of inside and outside hydraulic pressure, makes pipe produce local large deformation;
The 5th step, discharges highly pressurised liquid, and pipe fitting is taken out from stepped mould, finally obtains partial cross section's expansion rate and reaches 50% stepped reducer pipe fitting.
embodiment 3
The first step, is 30mm by diameter, long for 400mm, puts into three-way valve mold, upper and lower mould matched moulds after the 304 stainless steel pipe removing surfaces of wall thickness 2mm;
Second step, packs drift in pipe into and seals;
The 3rd step, to the inner injected water of pipe, to outer surface of tube blank (being mould inside) injection liquid force feed, the hydraulic pressure rapidly hydraulic pressure in pipe being increased to outside 60 MPa, pipe increases to 3 MPa, then slowly increase the inside and outside hydraulic pressure of pipe, the hydraulic pressure of controlling in pipe maintains 65MPa substantially at working stage, hydraulic pressure outside pipe maintains 5MPa substantially at working stage, and controlling the inside and outside pressure differential of pipe is 60MPa;
The 4th step, utilizes Hydraulic Cylinder drift axial feed to realize feed supplement, under the differential pressure effect of inside and outside hydraulic pressure, makes pipe produce local large deformation;
The 5th step, discharges highly pressurised liquid, and pipe fitting is taken out from three-way valve mold, finally obtains arm height and reaches 1.2 times of 304 above stainless steel tee pipe fittings of pipe diameter.
Above-described embodiment taking monometallic pipe as example describes in detail manufacturing process of the present invention, the present invention is equally also adapted to bimetal clad pipe blank.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make under the premise without departing from the principles of the invention some improvement, and these improve and also should be considered as protection scope of the present invention.
Claims (5)
1. a differential pressure manufacturing process for local large deformation hollow object, is characterized in that comprising the following steps:
1), pipe (2) is inserted in mould (1), after matched moulds, seal with drift (3);
2), respectively to pressurization after the inside and outside injection highly pressurised liquid of pipe (2) (4), and make the inner pressure of pipe (2) be greater than external pressure, mineralization pressure is poor;
3), promote drift (3) axial feed and realize feed supplement, under the differential pressure effect of inside and outside hydraulic pressure, make pipe (2) produce local large deformation simultaneously;
4), discharge highly pressurised liquid (4), finally obtain needed local large deformation hollow object.
2. the differential pressure manufacturing process of a kind of local large deformation hollow object according to claim 1, it is characterized in that described step 2) pressurization pressure control process is: by the hydraulic pressure in pipe (2) rise to 40-60MPa, the outer hydraulic pressure of pipe (2) rises to 3-7MPa, then slowly increase the inside and outside hydraulic pressure of pipe (2), make the hydraulic pressure in pipe (2) maintain 45-65MPa, the outer hydraulic pressure of pipe (2) maintains 5-10MPa, keeps the pressure differential of inside and outside 35-60MPa of pipe (2).
3. the differential pressure manufacturing process of a kind of local large deformation hollow object according to claim 1 and 2, is characterized in that: described pipe (2) inner high voltage liquid (4) is water or hydraulic oil.
4. the differential pressure manufacturing process of a kind of local large deformation hollow object according to claim 3, is characterized in that: the outer highly pressurised liquid of described pipe (2) (4) is hydraulic oil.
5. the differential pressure manufacturing process of a kind of local large deformation hollow object according to claim 4, is characterized in that: described pipe (2) is monometallic pipe or bimetal clad pipe blank.
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| CN201410132719.0A CN103920788A (en) | 2014-04-03 | 2014-04-03 | Differential pressure forming method for local large-deformation hollow pieces |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268811A (en) * | 2015-06-19 | 2016-01-27 | 新昌县航达机械制造有限公司 | Large-diameter T-branch pipe locking type rigid-plasticity combined bulging forming die |
| CN105268818A (en) * | 2015-06-19 | 2016-01-27 | 新昌县航达机械制造有限公司 | T-branch pipe locking type rigid-plasticity combined type bulging equipment |
| CN105312389A (en) * | 2015-06-19 | 2016-02-10 | 新昌县航达机械制造有限公司 | T-branch lock catch type rigidity and plasticity compound bulging forming equipment |
| CN105414301A (en) * | 2015-12-01 | 2016-03-23 | 保隆(安徽)汽车配件有限公司 | Novel hydraulic pipe fitting former |
| CN105921584A (en) * | 2016-04-19 | 2016-09-07 | 南京航空航天大学 | Air pressure bulging method of ultrahigh-strength steel hollow component |
| CN107289813A (en) * | 2017-07-19 | 2017-10-24 | 中国人民解放军军械工程学院 | A kind of outer Self tightening device of firearms barrel hydraulic pressure and outer tightening method |
| CN107803423A (en) * | 2017-11-30 | 2018-03-16 | 中国科学院金属研究所 | A kind of shaped structure and manufacturing process for manufacturing lightweight automobile rim |
| CN108213167A (en) * | 2018-03-14 | 2018-06-29 | 北京理工大学 | A kind of method of the swollen type of tubing differential pressure |
| CN108372225A (en) * | 2018-01-04 | 2018-08-07 | 沈阳化工大学 | A kind of process of helical stator negative camber substep high pressure mold filling bulging |
| CN108526284A (en) * | 2018-04-18 | 2018-09-14 | 保隆(安徽)汽车配件有限公司 | The outer low pressure molding method of high pressure and molding machine in a kind of pipe fitting |
| CN108941303A (en) * | 2018-06-25 | 2018-12-07 | 哈尔滨工业大学 | A kind of hot internal pressure manufacturing process of abnormity variable cross-section pipe fitting axial difference pressure |
| CN112496138A (en) * | 2020-11-09 | 2021-03-16 | 保隆(安徽)汽车配件有限公司 | Internal high-pressure forming die and forming method of workpiece |
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| EP0740969A1 (en) * | 1995-05-04 | 1996-11-06 | Rasselstein Hoesch GmbH | Process for manufacturing a metallic hollow corpus of complex shape |
| WO1999025505A2 (en) * | 1997-11-14 | 1999-05-27 | Mannesmann Ag | Method and device for reducing the wall friction during an internal high pressure forming process |
| US6128936A (en) * | 1998-09-09 | 2000-10-10 | Kabushiki Kaisha Opton | Bulging device and bulging method |
| JP2005262307A (en) * | 2004-03-22 | 2005-09-29 | Aisin Takaoka Ltd | Manufacturing method and apparatus of hollow metallic component |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0740969A1 (en) * | 1995-05-04 | 1996-11-06 | Rasselstein Hoesch GmbH | Process for manufacturing a metallic hollow corpus of complex shape |
| WO1999025505A2 (en) * | 1997-11-14 | 1999-05-27 | Mannesmann Ag | Method and device for reducing the wall friction during an internal high pressure forming process |
| US6128936A (en) * | 1998-09-09 | 2000-10-10 | Kabushiki Kaisha Opton | Bulging device and bulging method |
| JP2005262307A (en) * | 2004-03-22 | 2005-09-29 | Aisin Takaoka Ltd | Manufacturing method and apparatus of hollow metallic component |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268811A (en) * | 2015-06-19 | 2016-01-27 | 新昌县航达机械制造有限公司 | Large-diameter T-branch pipe locking type rigid-plasticity combined bulging forming die |
| CN105268818A (en) * | 2015-06-19 | 2016-01-27 | 新昌县航达机械制造有限公司 | T-branch pipe locking type rigid-plasticity combined type bulging equipment |
| CN105312389A (en) * | 2015-06-19 | 2016-02-10 | 新昌县航达机械制造有限公司 | T-branch lock catch type rigidity and plasticity compound bulging forming equipment |
| CN105414301A (en) * | 2015-12-01 | 2016-03-23 | 保隆(安徽)汽车配件有限公司 | Novel hydraulic pipe fitting former |
| CN105414301B (en) * | 2015-12-01 | 2017-06-30 | 保隆(安徽)汽车配件有限公司 | A kind of hydraulic tube piece former |
| CN105921584A (en) * | 2016-04-19 | 2016-09-07 | 南京航空航天大学 | Air pressure bulging method of ultrahigh-strength steel hollow component |
| CN107289813A (en) * | 2017-07-19 | 2017-10-24 | 中国人民解放军军械工程学院 | A kind of outer Self tightening device of firearms barrel hydraulic pressure and outer tightening method |
| CN107803423A (en) * | 2017-11-30 | 2018-03-16 | 中国科学院金属研究所 | A kind of shaped structure and manufacturing process for manufacturing lightweight automobile rim |
| CN108372225A (en) * | 2018-01-04 | 2018-08-07 | 沈阳化工大学 | A kind of process of helical stator negative camber substep high pressure mold filling bulging |
| CN108213167A (en) * | 2018-03-14 | 2018-06-29 | 北京理工大学 | A kind of method of the swollen type of tubing differential pressure |
| CN108526284A (en) * | 2018-04-18 | 2018-09-14 | 保隆(安徽)汽车配件有限公司 | The outer low pressure molding method of high pressure and molding machine in a kind of pipe fitting |
| WO2019201009A1 (en) * | 2018-04-18 | 2019-10-24 | 保隆(安徽)汽车配件有限公司 | Method for forming pipe fitting with internal high pressure and external low pressure, and forming machine |
| US11338345B2 (en) | 2018-04-18 | 2022-05-24 | Baolong (Anhui) Auto Parts Co., Ltd | Method for forming tube with high internal pressure and low external pressure, and forming machine |
| CN108941303A (en) * | 2018-06-25 | 2018-12-07 | 哈尔滨工业大学 | A kind of hot internal pressure manufacturing process of abnormity variable cross-section pipe fitting axial difference pressure |
| CN112496138A (en) * | 2020-11-09 | 2021-03-16 | 保隆(安徽)汽车配件有限公司 | Internal high-pressure forming die and forming method of workpiece |
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Application publication date: 20140716 |