CN103990672B - High-strength steel cold stamping Form springback control method - Google Patents
High-strength steel cold stamping Form springback control method Download PDFInfo
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- CN103990672B CN103990672B CN201410190077.XA CN201410190077A CN103990672B CN 103990672 B CN103990672 B CN 103990672B CN 201410190077 A CN201410190077 A CN 201410190077A CN 103990672 B CN103990672 B CN 103990672B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 27
- 239000010959 steel Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000005452 bending Methods 0.000 claims abstract description 16
- 238000007493 shaping process Methods 0.000 claims abstract description 12
- 230000008602 contraction Effects 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 5
- 230000002146 bilateral effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000004080 punching Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The present invention relates to a kind of high-strength steel Form springback control method, it is characterized in that: the structure of the punch at high-strength steel shaping dies is improved, the material in bending forming region is fully out of shape, product is bent filleted corner to increase, make fillet place plate produce Local Contraction state, reach the object of plastic deformation to eliminate or to reduce bending springback; It is by changing die punch appearance and size, and the inner side making product bend R angular position is compressed, to eliminate the method for resilience; When steel plate U-bend is bent, owing to there being bilateral symmetry to bend, adopt effectiveness comparison in this way good.Resilience is mainly because the stress difference of (stretching) outside material bending position and inner side (contraction) causes, because the stress difference of the outside (stretching) of high strength steel plate and inner side (contraction) is comparatively large, the distortion therefore produced is also larger.In order to reduce the resilience that flexural deformation produces, the stress difference of the outside at material bending position (stretching) and inner side (contraction) must be offset or eliminate to reach the object controlling resilience.
Description
Technical field
The present invention relates to a kind of high-strength steel cold stamping Form springback control method, particularly relate to the forming dimension accuracy control method of high strength steel plate cold-stamped part, belong to cold stamping forming technique field.
Background technology
Resilience is one of major defect of steel plate cold stamping forming process. have a strong impact on appearance and size and the precision of stamping parts, it is the forming defects being difficult in actual production processing effectively overcome, it not only reduces product quality and production efficiency. and also limit the enforcement of automatic production line, is the critical problem needing in China's automobile manufacture industry to solve.The yield stress of high-strength steel sheet is apparently higher than common metal sheet material, and the springback capacity of this kind of material is often very large, can not meet dimensional requirement after once stamping and size is unstable, brings difficulty to the Assembly of the parts in later stage and use.Conventional solution increases trimming, and namely part reshapes and once just can meet the demands.In processing cost, add about 1/4 to 1/5 like this, production efficiency reduces by 1/4.
Summary of the invention
The object of the present invention is to provide a kind of high-strength steel Form springback control method, it is by changing die punch appearance and size, and the inner side making product bend R angular position is compressed, to eliminate the method for resilience; When steel plate U-bend is bent, owing to there being bilateral symmetry to bend, adopt effectiveness comparison in this way good.Resilience is mainly because the stress difference of (stretching) outside material bending position and inner side (contraction) causes, because the stress difference of the outside (stretching) of high strength steel plate and inner side (contraction) is comparatively large, the distortion therefore produced is also larger.In order to reduce the resilience that flexural deformation produces, the stress difference of the outside at material bending position (stretching) and inner side (contraction) must be offset or eliminate to reach the object controlling resilience.
Technical scheme of the present invention is achieved in that a kind of high-strength steel Form springback control method, it is characterized in that: the structure of the punch at high-strength steel shaping dies is improved, the material in bending forming region is fully out of shape, product is bent filleted corner to increase, make fillet place plate produce Local Contraction state, reach the object of plastic deformation to eliminate or to reduce bending springback; Its concrete steps are as follows:
1) yield strength of this material is first found out according to the raw material trade mark of product, because raw material deflection needs the side-play amount changing filleted corner to realize, and side-play amount and material thickness and the directly proportional relation of coefficient, coefficient delta value is found by the respective value of table 1, then coefficient is multiplied with product material thick t representation unit mm, show that side-play amount S represents, namely
s=Δ t
2) need to calculate spares bend filleted corner increased in size Rn after obtaining side-play amount to represent, represent that adding deviant S represents by former part forming filleted corner with R, newly can be bent filleted corner size Rn and represent, namely
rn=R+S;
3) moved along punch horizontal direction the O position, the center of circle, R angle of original punch 1, distance is S side-play amount, obtains new center of circle O1, obtains new punch structure;
The appearance and size of the punch 2 fillet R of shaping dies is become greatly Rn=R+S, the center of circle is parallel with punch 2 bottom surface, side-play amount S, and effect is that the quality of shaping or flange product is effectively controlled, flange angular error controls, at ± 0.5-1 °, to meet the normal instructions for use of product;
Rn=R＋S
Fillet radius after Rn------increases
R------part fillet radius, punch filleted corner
S
-----side-play amount
S=Δt
T-------steel plate thickness
Δ------coefficient is selected according to the yield strength of steel plate, and general range of choice is 0.05 ~ 0.18.
Good effect of the present invention is the resilience in order to produce when eliminating or reduce flexural deformation, does not need to carry out postorder process again, and the technique production efficiency that is optimized significantly improves, and production cost reduces the stability that simultaneously ensure that product, thus improves part quality.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the enlarged drawing of product of the present invention local.
Fig. 3 is the schematic diagram of the present invention's product to be produced.
Fig. 4 is the schematic diagram of the normal mould of processing product.
Fig. 5 is the schematic diagram of processing parts A of the present invention.
Fig. 6 is the schematic diagram of processing parts B of the present invention.
Fig. 7 is the schematic diagram of processing parts C of the present invention.
Fig. 8 is the schematic diagram of processing parts D of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described: as shown in Figure 1, a kind of high-strength steel Form springback control method, it is characterized in that: the structure of the punch 1 at high-strength steel shaping dies is improved, the material in bending forming region is fully out of shape, product 2 is bent filleted corner to increase, make fillet place plate produce Local Contraction state, reach the object of plastic deformation to eliminate or to reduce bending springback; Its concrete steps are as follows:
1) yield strength of this material is first found out according to the raw material trade mark of product, because raw material deflection needs the side-play amount changing filleted corner to realize, and side-play amount and material thickness and the directly proportional relation of coefficient, coefficient delta value is found by the respective value of table 1, then coefficient is multiplied with product material thick t representation unit mm, show that side-play amount S represents, namely
s=Δ t
2) need to calculate spares bend filleted corner increased in size Rn after obtaining side-play amount to represent, represent that adding deviant S represents by former part forming filleted corner with R, newly can be bent filleted corner size Rn and represent, namely
rn=R+S;
3) moved along punch horizontal direction the O position, the center of circle, R angle of original punch 1, distance is S side-play amount, obtains new center of circle O1, obtains new punch structure;
The appearance and size of the punch 2 fillet R of shaping dies is become greatly Rn=R+S, the center of circle is parallel with punch 2 bottom surface, side-play amount S, and effect is that the quality of shaping or flange product is effectively controlled, flange angular error controls, at ± 0.5-1 °, to meet the normal instructions for use of product;
Rn=R＋S
Fillet radius after Rn------increases
R------part fillet radius, punch filleted corner
S
-----side-play amount
S=Δt
T-------steel plate thickness
Δ------coefficient is selected according to the yield strength of steel plate, and general range of choice is 0.05 ~ 0.18.
Embodiment 1
Punch structure at high-strength steel shaping dies is improved, the material in bending forming region is fully out of shape, spares bend filleted corner is increased, make fillet place plate produce Local Contraction state, reach the object of plastic deformation to eliminate or to reduce bending springback; Its concrete steps are as follows:
First the yield strength of this material is found out according to the raw material trade mark of part, because raw material amount of plastic deformation needs to be realized by the side-play amount of filleted corner, and side-play amount and material thickness and the directly proportional relation of coefficient, namely
s=Δ t;Δ value is coefficient, and t is that part material is thick, and side-play amount is S, adequately obtains
Δvalue, processing parts is completed by following steps as shown in Figure 3: high-strength steel part (material trademark is HC340LA thickness t=2.0), the mould structure as Fig. 4 is taked to process, this mould obtains punching parts A as shown in Figure 5 through punching production process, actual measurement part forming angle is 92.3 °, shape angles overproof (accessory size requires 90 ° ± 1 °).
When adjustment mould, make the punch-nose angle R=3 of mould increase to R=3.2, the fillet center of circle moves horizontally 0.2mm and obtains center of circle O2, then carries out punching press with this mould structure and obtain part B as shown in Figure 6, is 91.4 ° by actual measurement part forming angle.
Again adjust mould structure, make the punch filleted corner R=3 of mould increase to R=3.4, obtain punching parts C as shown in Figure 7, actual measurement part forming angle is 89.8 °.
Continue adjustment mould structure, make the punch filleted corner R=3 of mould increase to R=3.35, obtain punching parts D as shown in Figure 8, actual measurement part forming angle is 90.2 °.This angle with require that size (90 ° ± 1 °) is close, and meet instructions for use.
Reach a conclusion according to above experimental data: as shown in Figure 8, when punch-nose angle R=3 increases to R=3.35, part forming angle meets design requirement, now part filleted corner depth of cup and side-play amount S are 3.35-3=0.35mm, do experiment obtain conclusion, depth of cup and the thick direct proportionality of material by different material is thick again.So draw deformation coefficient
Δ=S/t.the appearance and size of the punch-nose angle R of shaping dies is become greatly Rn=R+S, the center of circle is parallel with punch bottom surface, side-play amount S, and effect is that the quality of shaping or flange product is effectively controlled, flange angular error controls, at ± 0.5-1 °, to meet the normal instructions for use of product.
Embodiment 2
As the thickness t=1.2 of punching parts, material trademark B340/590DP(yield strength 340-440Mpa, tensile strength>=590Mpa) time, filleted corner size R=5 (tolerance+0.5) we need the mould of part to be processed is above redesigned, first material yield strength 340-440Mpa is calculated by mean value, i.e. (340+440)/2=390Mpa, and coefficient of correspondence value found by the table of comparisons 1
Δ=0.17,according to formula
s=Δ t=0.17x1.2=0.204mm,
New bending filleted corner size (representing with Rn),
rn=R+S=5+0.204=5.204mm,namely the appearance and size of punch-nose angle R can be selected
5.204mmprocess, make product reach normal instructions for use.
Embodiment 3
As the thickness t=2.0 of stamped part, material trademark HC420LA(surrenders strong 420-520Mpa,), filleted corner size R=3 (tolerance+0.5), component die punch to be processed redesigns, first the mean value of material yield strength 420-520Mpa is calculated, i.e. (420+520)/2=470Mpa, the coefficient value of 1 correspondence and contrast is tabled look-up
Δ=0.15,displacement is gone out according to formulae discovery
s=Δ t=0.15x2.0=0.3mm,
New bending filleted corner size (representing with Rn),
rn=R+S=3+0.3=3.3mm,
Namely the appearance and size of punch-nose angle R can be selected
3.3mmprocess, make product reach normal instructions for use.
Claims (1)
1. a high-strength steel Form springback control method, it is characterized in that: the structure of the punch at high-strength steel shaping dies is improved, the material in bending forming region is fully out of shape, product is bent filleted corner to increase, make fillet place plate produce Local Contraction state, reach the object of plastic deformation to eliminate or to reduce bending springback; Its concrete steps are as follows:
1) yield strength of this material is first found out according to the raw material trade mark of product, because raw material deflection needs the side-play amount changing filleted corner to realize, and side-play amount and material thickness and the directly proportional relation of material coefficient, find coefficient delta value, then coefficient is multiplied with product material thick t representation unit mm, show that side-play amount S represents, namely
s=Δ t
2) need to calculate spares bend filleted corner increased in size Rn after obtaining side-play amount to represent, represent that adding deviant S represents by former part forming filleted corner with R, newly can be bent filleted corner size Rn and represent, namely
rn=R+S;
3) moved along punch horizontal direction the O position, the center of circle, R angle of original punch, distance is S side-play amount, obtains new center of circle O1, obtains new punch structure;
The appearance and size of the punch-nose angle R of shaping dies is become greatly Rn=R+S, the center of circle is parallel with punch (2) bottom surface, side-play amount S, and effect is that the quality of flange product is effectively controlled, flange angular error controls, at ± 0.5-1 °, to meet the normal instructions for use of product;
Rn=R＋S
Fillet radius after Rn------increases
R------part fillet radius, punch filleted corner
S
-----side-play amount
S=Δt
T-------steel plate thickness
Δ------coefficient is selected according to the yield strength of steel plate, and general range of choice is 0.05 ~ 0.18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410190077.XA CN103990672B (en) | 2014-05-07 | 2014-05-07 | High-strength steel cold stamping Form springback control method |
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| CN201410190077.XA CN103990672B (en) | 2014-05-07 | 2014-05-07 | High-strength steel cold stamping Form springback control method |
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| CN103990672B true CN103990672B (en) | 2016-04-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10807137B2 (en) * | 2015-01-26 | 2020-10-20 | Nippon Steel Corporation | Production method for producing a press-formed product |
| CN104772391B (en) * | 2015-03-19 | 2017-02-01 | 柳州市永益机械制造有限公司 | Clip punching die |
| CN104690113B (en) * | 2015-03-19 | 2017-05-31 | 广州欧华电气有限公司 | The process for stamping of clamp |
| CN104874681B (en) * | 2015-04-27 | 2017-10-31 | 张赛飞 | R angles amendment sheet metal mould and application thereof and sheet-metal formed method |
| CN107745043A (en) * | 2017-12-01 | 2018-03-02 | 柳州市钜嘉机械有限公司 | A kind of automobile panel resilience handles mould structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101653800A (en) * | 2009-09-21 | 2010-02-24 | 吉林大学 | Ultrahigh strength steel stamping part rebound control method |
| CN201855876U (en) * | 2010-10-19 | 2011-06-08 | 中国一拖集团有限公司 | Die structure for compensating bending springback angle |
| CN102601193A (en) * | 2012-03-14 | 2012-07-25 | 吉林大学 | Method for controlling rebounding of high-strength steel by aid of elliptical-arc-shaped fillet of female die |
| CN102672059A (en) * | 2011-03-16 | 2012-09-19 | 重庆长安汽车股份有限公司 | Method for determining modification molding surface of female mold or male mold of mold according to thickness of simulation stamped workpiece |
| CN102989891A (en) * | 2012-11-27 | 2013-03-27 | 王琰 | Toothholder stamping die of brake |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2689831B2 (en) * | 1992-09-30 | 1997-12-10 | 豊田合成株式会社 | Stamping molding method |
| SE535682C2 (en) * | 2011-03-21 | 2012-11-06 | Ssab Technology Ab | Method of cold forming a sheet metal by bending or pressing molding |
-
2014
- 2014-05-07 CN CN201410190077.XA patent/CN103990672B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101653800A (en) * | 2009-09-21 | 2010-02-24 | 吉林大学 | Ultrahigh strength steel stamping part rebound control method |
| CN201855876U (en) * | 2010-10-19 | 2011-06-08 | 中国一拖集团有限公司 | Die structure for compensating bending springback angle |
| CN102672059A (en) * | 2011-03-16 | 2012-09-19 | 重庆长安汽车股份有限公司 | Method for determining modification molding surface of female mold or male mold of mold according to thickness of simulation stamped workpiece |
| CN102601193A (en) * | 2012-03-14 | 2012-07-25 | 吉林大学 | Method for controlling rebounding of high-strength steel by aid of elliptical-arc-shaped fillet of female die |
| CN102989891A (en) * | 2012-11-27 | 2013-03-27 | 王琰 | Toothholder stamping die of brake |
Non-Patent Citations (3)
| Title |
|---|
| U型卡夹冲压回弹的控制;黄江涛;《武汉造船》;19990228(第01期);第29-31页 * |
| U形弯曲件回弹补偿半径的计算;彭伟等;《南昌大学学报(工科版)》;20080331;第30卷(第01期);第71-78页 * |
| 板料弯曲回弹的机理分析及减少回弹的措施;武晓红;《模具技术》;20020930(第05期);第45-48页 * |
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Effective date of registration: 20160226 Address after: 130103 Chaoyang District, Jilin, Silicon Valley street, No. 7999, No. Applicant after: YUN JIA Group Ltd. Address before: 130103 Chaoyang District, Jilin, Silicon Valley street, No. 7999, No. Applicant before: YUNDING AUTOMOBILE PARTS SHARE Co.,Ltd. |
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