CN102228932B - Forming method for improving stepped hollow reducing pipe wall thickness uniformity - Google Patents
Forming method for improving stepped hollow reducing pipe wall thickness uniformity Download PDFInfo
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- CN102228932B CN102228932B CN 201110102587 CN201110102587A CN102228932B CN 102228932 B CN102228932 B CN 102228932B CN 201110102587 CN201110102587 CN 201110102587 CN 201110102587 A CN201110102587 A CN 201110102587A CN 102228932 B CN102228932 B CN 102228932B
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Abstract
The invention discloses a forming method for improving stepped hollow reducing pipe wall thickness uniformity, and relates to a forming method of a stepped hollow reducing pipe. The method aims to solve the problem of cracking due to wall thickness reduction caused by high local deformation in the conventional stepped hollow reducing pipe forming method. The method comprises the following steps of: selecting a hollow pipe as an original blank; performing electromagnetic reducing formation on the hollow pipe, winding a coil at the middle part of the hollow pipe, performing connection to form a series circuit, and switching on a switch to electrify the coil, so that the coil generates a magnetic field force and the middle part of the hollow pipe generates reducing deformation; putting the reduced hollow pipe into a forming die, and simultaneously sealing two ports of the hollow pipe by adopting a left sealing punch head and a right sealing punch head; gradually applying internal pressure and performing internal high-pressure hydraulic formation; and relieving the internal pressure, removing the left sealing punch head and the right sealing punch head, and taking out the formed pipe. The method is used for forming the stepped hollow reducing pipe.
Description
Technical field
The present invention relates to the manufacturing process of the hollow reducer pipe in a species stage.
Background technology
In fields such as Aeronautics and Astronautics and auto industrys, alleviating architecture quality is the long-term targets of pursuing of people to save operating energy, also is one of trend of modern advanced manufacturing technique development.Light in structure quantizes to have two main paties: the one, and the material approach adopts the light materials such as aluminium alloy, magnesium alloy, titanium alloy and composite; The 2nd, structural approaches is main structure for bearing bending load, adopts hollow non-uniform member, can alleviate the strength and stiffness that quality can take full advantage of again material.A kind of loss of weight that internal high pressure forming develops under such background just, material-saving, energy-conservation have the novel advanced manufacturing technology of the hollow light body structure spare of wide application prospect.When the lightweight metal materials such as aluminium alloy, magnesium alloy and high-strength steel were widely used, hollow non-uniform member became first-selected ideal structure form.
The hollow reducer pipe of ladder that a kind of special construction is arranged at industrial circle, its principal character is that the diameter of whole part interlude is the shortest, takes second place in two ends, the left and right sides, and the position diameter between centre and two ends is maximum, total is that left-right symmetry distributes, as shown in Figure 1.
The manufacturing process of the part of former this structure generally is to choose the pipe fitting of locating (minimum diameter) same size with the centre position, is put in the shaping dies, and then two ends pipe sealing, middle high-pressure forming, as shown in Figure 2.But this method can because the local deformation amount is large, cause wall thickness reduction and then cracking for two positions of maximum swelling amount.
Summary of the invention
The objective of the invention is that the problem of cracking provides a kind of manufacturing process that improves stepped hollow reducing pipe wall thickness uniformity because the local deformation amount causes wall thickness reduction greatly in order to solve the existing hollow reducer pipe manufacturing process of ladder.
The present invention is achieved by following proposal: said method comprising the steps of: step 1, select hollow pipe fitting as original blank, the diameter of the hollow pipe fitting pipe fitting end diameter that equals to be shaped; Step 2, at first hollow pipe fitting is carried out the electromagnetism reducing formation, be wrapped with coil at the middle part of hollow pipe fitting, and be linked to be series circuit, then close a switch, with coil electricity, coil produces magnetic field force, make the middle part of hollow pipe fitting produce necking deformation, be 0.015 second-0.020 second conduction time; Step 3, the hollow pipe fitting centering behind the undergauge is put in the die cavity of shaping dies, the undergauge place that makes hollow pipe fitting between two protruding profiles, adopts left sealing punch and right sealing punch that two ports of hollow pipe fitting are implemented encapsulation process simultaneously in die cavity; Then compress into capable internal high pressure hydraulic in applying gradually and be shaped, the interior pressure that applies is 20-100Mpa, and the time that applies interior pressure is 30 seconds-120 seconds; Step 4, be shaped complete after, shed interior pressure, remove left sealing punch and right sealing punch, lift the patrix of mould, take out the shaping pipe fitting.
The present invention compared with prior art has following beneficial effect: the method that the present invention uses is to take pipe fitting with the end positions place diameter same size of the pipe fitting that is shaped as original blank, carry out first electro-magnetic forming, pipe to the place, centre carries out reducing formation, the pipe diameter at place is equal to or less than the minimum diameter of part middle part in the middle of making, and then is put into and carries out internal high pressure forming in the mould.The benefit of doing like this is that the swell increment at the maximum position of diameter of part is greatly lowered.
Description of drawings
The design of part schematic diagram that Fig. 1 the inventive method is shaped, wherein D2＞D1＞D3; Fig. 2 is the die profile when using traditional inside high-pressure forming method formation of parts; Fig. 3 is the die profile when utilizing the inventive method to be shaped this type of part; Fig. 4 is the schematic diagram that original pipe is carried out the electromagnetism reducing formation.
The specific embodiment
The specific embodiment one: below in conjunction with Fig. 3 and the bright present embodiment of Fig. 4, the method for present embodiment may further comprise the steps: step 1, select hollow pipe fitting 3 as original blank, the diameter of the hollow pipe fitting 3 pipe fitting end diameter D2 that equals to be shaped; Step 2, at first hollow pipe fitting 3 is carried out the electromagnetism reducing formation, be wrapped with coil 5 at the middle part of hollow pipe fitting 3, and be linked to be series circuit, then close a switch, with coil 5 energisings, coil 5 produces magnetic field force, makes the middle part of hollow pipe fitting 3 produce necking deformation, and be 0.015 second-0.020 second conduction time; Step 3, hollow pipe fitting 3 centerings behind the undergauge are put in the die cavity of shaping dies 2, the undergauge place that makes hollow pipe fitting 3 between two protruding profiles, adopts two ports of left sealing punch 1 and 4 pairs of hollow pipe fittings 3 of right sealing punch to implement simultaneously encapsulation process in die cavity; Then compress into capable internal high pressure hydraulic in applying gradually and be shaped, the interior pressure that applies is 20-100Mpa, and the time that applies interior pressure is 30 seconds-120 seconds; Step 4, be shaped complete after, shed interior pressure, remove left sealing punch 1 and right sealing punch 3, lift the patrix of mould 2, take out the shaping pipe fitting.
Take accessory size shown in Figure 1 as example, with the shaping dies profile of conventional hydraulic forming method as shown in Figure 3, the changes of section of its maximum distortion section is for to be formed into Φ 32mm by Φ 16mm, and swell increment is 100%.And the shaping dies profile of using manufacturing process of the present invention as shown in Figure 4, the changes of section of its maximum distortion section is for to be formed into Φ 32mm by Φ 20mm, swell increment is 60%, as seen its swell increment reduces to 60% by 100%, improved the inhomogeneities of distortion, lowered the reduction of wall thickness, make the Thickness Distribution of the part after the shaping more even, especially for the part of this structure of big section difference (pipe fitting maximum and minimum diameter ratio), the superiority of this method embodies more obviously.
The specific embodiment two: when the material of original blank was aluminium alloy, the interior pressure that applies was 20-30Mpa in the step 3 of present embodiment.Other step is identical with the specific embodiment one.
The specific embodiment three: when the material of original blank was high-strength steel, the interior pressure that applies was 80-100Mpa in the step 3 of present embodiment.Other step is identical with the specific embodiment one.
The specific embodiment four: the scope of necking deformation amount in the step 2 of present embodiment (ratio of shaping pipe fitting minimum diameter and original pipe diameter) is 0.5-1.Other step is identical with the specific embodiment one.
Claims (4)
1. manufacturing process that improves stepped hollow reducing pipe wall thickness uniformity, it is characterized in that said method comprising the steps of: step 1, select hollow pipe fitting (3) as original blank, the diameter of hollow pipe fitting (3) the pipe fitting end diameter (D2) that equals to be shaped; Step 2, at first hollow pipe fitting (3) is carried out the electromagnetism reducing formation, be wrapped with coil (5) at the middle part of hollow pipe fitting (3), and be linked to be series circuit, then close a switch, coil (5) is switched on, coil (5) produces magnetic field force, makes the middle part of hollow pipe fitting (3) produce necking deformation, and be 0.015 second-0.020 second conduction time; Step 3, the hollow pipe fitting behind the undergauge (3) centering is put in the die cavity of shaping dies (2), the undergauge place that makes hollow pipe fitting (3) between two protruding profiles, adopts left sealing punch (1) and right sealing punch (4) that two ports of hollow pipe fitting (3) are implemented encapsulation process simultaneously in die cavity; Then compress into capable internal high pressure hydraulic in applying gradually and be shaped, the interior pressure that applies is 20-100Mpa, and the time that applies interior pressure is 30 seconds-120 seconds; Step 4, be shaped complete after, shed interior pressure, remove left sealing punch (1) and right sealing punch (4), lift the patrix of mould (2), taking-up shaping pipe fitting.
2. the manufacturing process of described raising stepped hollow reducing pipe wall thickness uniformity according to claim 1 is characterized in that the interior pressure that applies in the step 3 is 20-30Mpa.
3. the manufacturing process of described raising stepped hollow reducing pipe wall thickness uniformity according to claim 1 and 2 is characterized in that the interior pressure that applies in the step 3 is 80-100Mpa.
4. the manufacturing process of described raising stepped hollow reducing pipe wall thickness uniformity according to claim 1 and 2, the scope that it is characterized in that necking deformation amount in the step 2 is 0.5-1, and the computational methods of described necking deformation amount are the ratio of shaping pipe fitting minimum diameter and original pipe diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201110102587 CN102228932B (en) | 2011-04-22 | 2011-04-22 | Forming method for improving stepped hollow reducing pipe wall thickness uniformity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110102587 CN102228932B (en) | 2011-04-22 | 2011-04-22 | Forming method for improving stepped hollow reducing pipe wall thickness uniformity |
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| CN102228932A CN102228932A (en) | 2011-11-02 |
| CN102228932B true CN102228932B (en) | 2013-02-13 |
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| CN 201110102587 Expired - Fee Related CN102228932B (en) | 2011-04-22 | 2011-04-22 | Forming method for improving stepped hollow reducing pipe wall thickness uniformity |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581110B (en) * | 2012-03-08 | 2014-02-26 | 沈阳飞机工业（集团）有限公司 | Electromagnetic quantitative shaping method and device for pipe fittings |
| CN103934307B (en) * | 2014-05-04 | 2016-06-22 | 南京航空航天大学 | There is the hollow parts manufacturing process of local flaser texture |
| CN106180345B (en) * | 2014-07-11 | 2018-07-20 | 佛山市顺德区欣庆五金塑料有限公司 | A kind of high intensity or the hot formed method of inductile material hollow unit low pressure |
| CN104624771B (en) * | 2015-01-05 | 2016-08-24 | 湖南大学 | A kind of device of the forming limit improving metal tube |
| JP6541979B2 (en) * | 2015-02-03 | 2019-07-10 | 株式会社神戸製鋼所 | Coil device for electromagnetic molding and method of manufacturing electromagnetic molding material |
| CN105047356A (en) * | 2015-08-26 | 2015-11-11 | 哈尔滨工业大学 | Solenoid coil for magnetic pulse forming |
| CN107537907A (en) * | 2016-06-28 | 2018-01-05 | 无锡卡豹动力科技有限公司 | A kind of forming method of automotive transmission pilot sleeve |
| CN109127886B (en) * | 2018-11-02 | 2019-11-15 | 哈尔滨工业大学 | A kind of air pressure-molding combined shaping method of seamed edge fillet R≤2t difficult-to-deformation material rectangular section hollow object |
| CN111168339A (en) * | 2020-01-15 | 2020-05-19 | 芜湖三联锻造股份有限公司 | Automobile transmission shaft and spinning forming process thereof |
| CN114769408B (en) * | 2022-04-21 | 2024-03-12 | 三峡大学 | Electromagnetic bulging method and device for pipe fitting with two-way loading of inner wall and outer wall of magnetic collector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19711103A1 (en) * | 1997-03-06 | 1998-09-10 | Udo Prof Dr Hellwig | Components deforming method by magnetic structuring |
| CN1824405A (en) * | 2005-08-08 | 2006-08-30 | 孙旭光 | Extrnal heating metal pipe high temperature ultra high water pressure once shaping technology method and equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS632523A (en) * | 1986-06-20 | 1988-01-07 | Hitachi Ltd | Sealing method for split die |
| DE10220429B4 (en) * | 2002-05-08 | 2006-03-02 | Amborn, Peter, Dr.-Ing. | Method for producing a hollow metal body |
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2011
- 2011-04-22 CN CN 201110102587 patent/CN102228932B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19711103A1 (en) * | 1997-03-06 | 1998-09-10 | Udo Prof Dr Hellwig | Components deforming method by magnetic structuring |
| CN1824405A (en) * | 2005-08-08 | 2006-08-30 | 孙旭光 | Extrnal heating metal pipe high temperature ultra high water pressure once shaping technology method and equipment |
Non-Patent Citations (1)
| Title |
|---|
| JP昭63-2523A 1988.01.07 |
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