CN101108401A - Metal sheet centre of circle changing molding technique - Google Patents
Metal sheet centre of circle changing molding technique Download PDFInfo
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- CN101108401A CN101108401A CNA2007100559665A CN200710055966A CN101108401A CN 101108401 A CN101108401 A CN 101108401A CN A2007100559665 A CNA2007100559665 A CN A2007100559665A CN 200710055966 A CN200710055966 A CN 200710055966A CN 101108401 A CN101108401 A CN 101108401A
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Abstract
The invention relates to a forming process for metal sheets with variable centers of circle. A metal sheet is formed for the first time under the function of the corresponding die, then the workpiece moves gradually forward to change the circle centre of the work piece, then the second forming is operated, and the like, until the shape of the work piece attains the required accuracy. The invention solves the difficult problem of resilience of the metal sheet, additional distortion, the resilience and fluctuation caused by the fluctuation in the material properties, so the forming accuracy is improved, the difficulty in die and production cost are reduced.
Description
Technical field
The present invention discloses a kind of metal sheet centre of circle changing molding technique, is used for the processing of orthodrome sheet forming, belongs to metal material processing manufacturing technology field.
Background technology
In machine industry, many workpiece that utilize technology sheet material to carry out brake forming are arranged.Mainly have following problem at present: 1. sheet metal produces very big resilience in the brake forming process, causes shape and size to produce error.2. various material resiliences are inconsistent, are difficult to control, influence Forming Quality.3. because resilience makes molding equipment, mould to repair repeatedly, cost increases greatly. and do not have effective theory and actual method in the world wide at present, can only lean on test of many times.4. particularly for the orthodrome sheet forming, resilience is bigger, is difficult to control, and after the resilience, circular arc no longer is a circular arc, becomes complex curve; Have in workpiece end and to become becoming of straight line; And be attended by additional deformation etc., also be difficult to meet the requirements of shape and size even repair mould.
Summary of the invention
The present invention is a kind of metal sheet centre of circle changing molding technique, solves the resilience fluctuation difficult problem of a sheet metal molding resilience difficult problem, an additional deformation difficult problem and the generation because material capability fluctuates, and improves the Workpiece shaping precision, reduces mould difficulty and production cost.
Technical solution of the present invention is as follows: make the moulding for the first time under corresponding mould action of sheet metal workpiece, workpiece is progressive forward at every turn afterwards moves, and the workpiece center of circle is changed, and carries out the moulding second time again, the rest may be inferred, meets the requirements of precision up to the workpiece shape.
Concrete steps are as follows:
1. adopt mould that sheet material is carried out the brake forming first time; Mold radius is 0.93～0.45 with the workpiece radius ratio, and circular arc that mould arc length and straight length are corresponding with workpiece and straight length equate, calculate the angle springback capacity thus: mould central angle a=RA/r.
A is the pairing central angle of workpiece circular arc in the formula; A is the pairing central angle of mould circular arc; R is a workpiece radius; R is a mold radius.Gap between upper mould and the counterdie be sheet metal thickness 1～1.1 doubly.
2. after the moulding for the first time, the progressive forward at every turn displacement t of workpiece changes the workpiece center of circle afterwards, carries out the moulding second time again, and the rest may be inferred 2-4 time, meets the requirements of precision up to the workpiece shape.
Move forward at every turn apart from t: be generally the 20%-40% of mold radius r, hour take off limit when mold radius, capping when mold radius is big also can be determined according to the actual mould debug results.Generally speaking, mold radius is more little, and the moulding number of times is just many more, therefore should provide rational maximum radius, reduces the moulding number of times.
Owing to adopt mould repeatedly workpiece to be become center of circle brake forming, be equivalent to reduce workpiece radius, increased curvature, the increase of flow of metal degree, tension are increased, the plastic deformation degree effectively increases, thereby has effectively overcome the resilience of workpiece.
Owing to adopted the less mold radius of relative workpiece, stressed fulcrum becomes near when making the workpiece brake forming, the additional deformation of having avoided workpiece to produce, and for example because workpiece is long, straight line portion produces crooked.Because the plastic deformation degree effectively increases, offset and overcome the resilience fluctuation difficult problem of material capability fluctuation generation simultaneously, improve the Workpiece shaping precision.
This technology is applicable to the moulding of orthodrome workpiece, and little circular arc works brake forming also can be adopted this technology.
This method is equivalent to reduce workpiece radius, has increased curvature, the flow of metal degree is increased and the tension increase, thereby has effectively overcome the resilience of workpiece.
The present invention is with progressive with respect to the advantage that prior art has: this invention adopts the change center of circle to become forming principle and technology, be equivalent to reduce workpiece radius, increase curvature, the flow of metal degree has been increased and the tension increase, thereby effectively overcome the resilience of workpiece.The increase of flow of metal degree, tension are increased, and the plastic deformation degree effectively increases, thereby has effectively overcome the resilience and the additional deformation of workpiece, mould is installed on the forcing press during work, when forcing press was descending, mould made Workpiece shaping, met the requirements of dimensional accuracy after the workpiece resilience.
Description of drawings
Fig. 1 Workpiece shaping figure
Fig. 2 is the one-shot forming schematic diagram;
Fig. 3 is for becoming center of circle forming technique schematic diagram.
Concrete real-time mode
For the ease of understanding the present invention, especially exemplified by following examples.Its effect is understood that it is to explaination of the present invention but not to any type of restriction of the present invention.
Embodiment 1
Framed side wallboard: the radius of workpiece 1 is R=827mm, and the circular arc two ends have long tangent straight line; Material is 09CuPCrNi, thickness 2.5mm; Radius r=the 380mm of mould 2; The radius of mould 2,3 and the radius ratio of workpiece 1 are 0.93～0.45, and circular arc that the arc length of mould 2,3 and straight length are corresponding with workpiece and straight length equate; Adopt mould that sheet material is carried out the brake forming first time.
After the moulding for the first time, workpiece is moved forward apart from t=140mm, the workpiece center of circle is changed, carry out the moulding second time again, the workpiece shape meets the requirements of dimensional accuracy.
The side top board: the radius of workpiece 1 is R=120mm, and arc end part has the long tangent line of 40mm; Material is 05CuPCrNi, thickness 2mm; Radius r=the 95mm of mould 2,3; Mold radius is 0.93～0.45 with the workpiece radius ratio, and circular arc that mould arc length and straight length are corresponding with workpiece and straight length equate.Adopt mould that sheet material is carried out the brake forming first time;
After the moulding for the first time, workpiece is moved forward apart from t=20mm, the workpiece center of circle is changed, carry out the moulding second time again, the workpiece shape meets the requirements of dimensional accuracy.
The headwall covering: the radius of workpiece 1 is R=150mm, and arc end part has the long tangent line of 40mm; Material is 05CuPCrNi, thickness 2mm; Radius r=the 110mm of mould 2,3; Mold radius is 0.93～0.45 with the workpiece radius ratio, and circular arc that mould arc length and straight length are corresponding with workpiece and straight length equate.Adopt mould that sheet material is carried out the brake forming first time;
After the moulding for the first time, workpiece is moved forward apart from t=25mm, the workpiece center of circle is changed, carry out the moulding second time again, the workpiece shape meets the requirements of dimensional accuracy.
Claims (2)
1. metal sheet centre of circle changing molding technique, it is characterized in that: make the moulding for the first time under corresponding mould action of sheet metal workpiece, workpiece is progressive forward at every turn afterwards moves, the workpiece center of circle is changed, carry out the moulding second time again, the rest may be inferred, meets the requirements of precision up to the workpiece shape.
2. moulding process according to claim 1, it is characterized in that: adopt mould that sheet material is carried out the brake forming first time, mold radius is 0.93～0.45 with the workpiece radius ratio, circular arc that mould arc length and straight length are corresponding with workpiece and straight length equate, calculate the angle springback capacity thus: mould central angle a=RA/r;
A is the pairing central angle of workpiece circular arc in the formula; A is the pairing central angle of mould circular arc; R is a workpiece radius; R is a mold radius;
Gap between upper mould and the counterdie be sheet metal thickness 1～1.1 doubly;
After the moulding for the first time, the progressive forward at every turn displacement t of workpiece changes the workpiece center of circle afterwards, carries out the moulding second time again, and the rest may be inferred 2～4 times, meets the requirements of precision up to the workpiece shape;
What move forward is the 20%-40% of mold radius r apart from t at every turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100559665A CN100493755C (en) | 2007-08-15 | 2007-08-15 | Metal sheet molding process fro changing centre of circle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100559665A CN100493755C (en) | 2007-08-15 | 2007-08-15 | Metal sheet molding process fro changing centre of circle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101108401A true CN101108401A (en) | 2008-01-23 |
| CN100493755C CN100493755C (en) | 2009-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100559665A Expired - Fee Related CN100493755C (en) | 2007-08-15 | 2007-08-15 | Metal sheet molding process fro changing centre of circle |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489574A (en) * | 2011-11-29 | 2012-06-13 | 重庆大学 | Method for springback control of incremental forming processing of plates |
| CN103260781A (en) * | 2010-12-14 | 2013-08-21 | 杰富意钢铁株式会社 | Method of designing material for cylinder formation process, and cylinder formation processed product |
| CN107052151A (en) * | 2016-12-14 | 2017-08-18 | 湖北三江航天红阳机电有限公司 | A kind of heavy wall circular arc part forming mould and manufacturing process |
| CN117086578A (en) * | 2023-10-17 | 2023-11-21 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy cylinder and cold roll forming method thereof |
-
2007
- 2007-08-15 CN CNB2007100559665A patent/CN100493755C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103260781A (en) * | 2010-12-14 | 2013-08-21 | 杰富意钢铁株式会社 | Method of designing material for cylinder formation process, and cylinder formation processed product |
| CN103260781B (en) * | 2010-12-14 | 2015-07-15 | 杰富意钢铁株式会社 | Method of designing material for cylinder formation process, and cylinder formation processed product |
| CN102489574A (en) * | 2011-11-29 | 2012-06-13 | 重庆大学 | Method for springback control of incremental forming processing of plates |
| CN107052151A (en) * | 2016-12-14 | 2017-08-18 | 湖北三江航天红阳机电有限公司 | A kind of heavy wall circular arc part forming mould and manufacturing process |
| CN117086578A (en) * | 2023-10-17 | 2023-11-21 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy cylinder and cold roll forming method thereof |
| CN117086578B (en) * | 2023-10-17 | 2024-02-02 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy cylinder and cold roll forming method thereof |
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| Publication number | Publication date |
|---|---|
| CN100493755C (en) | 2009-06-03 |
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Application publication date: 20080123 Assignee: Chongqing Changke city rail transit vehicle limited liability company Assignor: Changchun Track Passenger Train Co., Ltd. Contract record no.: 2010500000020 Denomination of invention: Metal sheet centre of circle changing molding technique Granted publication date: 20090603 License type: Exclusive License Record date: 20100419 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090603 Termination date: 20160815 |
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| CF01 | Termination of patent right due to non-payment of annual fee |