CN109325262A - A method of regulation steel plate and mold coefficient of friction reduce cold forming rebound - Google Patents
A method of regulation steel plate and mold coefficient of friction reduce cold forming rebound Download PDFInfo
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- CN109325262A CN109325262A CN201810965355.2A CN201810965355A CN109325262A CN 109325262 A CN109325262 A CN 109325262A CN 201810965355 A CN201810965355 A CN 201810965355A CN 109325262 A CN109325262 A CN 109325262A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000033228 biological regulation Effects 0.000 title claims abstract description 13
- 238000005452 bending Methods 0.000 claims abstract description 13
- 230000014509 gene expression Effects 0.000 claims abstract description 9
- 238000006467 substitution reaction Methods 0.000 claims abstract description 5
- 238000007493 shaping process Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000000314 lubricant Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 239000002480 mineral oil Substances 0.000 claims description 3
- 235000010446 mineral oil Nutrition 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- Mathematical Analysis (AREA)
- Computational Mathematics (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
The present invention relates to a kind of methods that regulation steel plate and mold coefficient of friction reduce cold forming rebound, include the following steps: to establish springback angleWith the yield strength of steel plate, the tensile strength of steel plate, the tangent modulus of steel plate, steel plate bending angle and steel plate and mold between coefficient of friction relational expression, the relational expression isIn formula: σsFor steel plate yield strength；σbFor tensile strength；T is tangent modulus；α is the bending angle of shaping workpiece；A, B, C, D, E, F are constant；Substitution method acquires the value of described A, B, C, D, E, F.When method in through the invention can simply, quickly determine that the steel plate of proposed adoption carries out cold forming, reach the coefficient of friction that matches needed for target springback capacity requirement.
Description
Technical field
The present invention relates to a kind of methods that regulation steel plate and mold coefficient of friction reduce cold forming rebound, belong to cold stamping
Forming technique field.
Background technique
With the development of science and technology and performance requirement, steel plate materials used in cold stamping formation of parts are constantly being sent out
In exhibition and renewal process.Part usually will appear rebound phenomenon in the cold stamping forming process of plate, directly affect product
Quality and yield, and the production efficiency of enterprise can be significantly reduced.Conventional solution is to increase trimming and to mold
It is redesigned, and the mechanical property of mold design and used plate is closely related.It is changed when being updated to sheet material
Dai Shi, due to the difference of mechanical property, it usually needs mold is designed again to reduce rebound, not only makes to produce in this way
Increased costs also result in the decline of production efficiency.Changing the coefficient of friction between steel plate and mold is the another kind for solving rebound
Effective way, compared with mold design, this method is simple, economical.When being replaced to steel plate materials used in part, such as
What determining coefficient of friction to match is key to obtain the springback capacity met the requirements, and excessive coefficient of friction be easy to cause plate
Material rupture, and coefficient of friction is smaller, springs back larger.
Summary of the invention
The object of the present invention is to provide the relational expressions between a calculating springback angle and coefficient of friction, to be returned according to required
It plays angle and required coefficient of friction is calculated, and then required by adjusting coefficient of friction with meeting rebound.
The technical solution used in the present invention are as follows: it is a kind of regulation steel plate and mold coefficient of friction reduce cold forming rebound
Method includes the following steps
S01 establishes the yield strength of springback angle Δ α and steel plate, the tensile strength of steel plate, the tangent modulus of steel plate, steel plate
Bending angle and steel plate and mold between coefficient of friction relational expression, the relational expression is
A α=(A+B σs+Cσb+DT+(Eσb+F)μ)α
In formula: σsFor steel plate yield strength；σbFor tensile strength；T is tangent modulus；α is the bending angle of steel plate； A,B,C,
D, E, F are constant；
S02 substitution method acquires the value of described A, B, C, D, E, F；
S03 obtains the σ of steel plate materials to be formed by mechanical property testss、σbAnd T, according to target springback angle and formula
Coefficient of friction needed for calculating between steel plate materials and mold to be formed；
The coefficient of friction that S04 adjusts between steel plate and mold keeps it consistent with gained coefficient of friction in S03.
Further, cold punching pressing formation is carried out by changing steel plate materials or changing coefficient of friction, obtains springback angle and counts
Calculation obtains the value of A, B, C, D, E, F.
Further, by changing the lubricant medium between mold and steel plate or changing described in the roughness adjustment of mold
Coefficient of friction between steel plate and mold.
Further, the stress and strain relationship of the steel plate materials meets bilinear relation.
Further, the friction media is one of unlubricated, mineral oil, graphite oil, molybdenum disulfide or a variety of
Combination.
Further, rubbing between the steel plate and mold is adjusted by changing the lubricant medium between mold and steel plate
Wipe coefficient.
Beneficial effect caused by the present invention include: through the invention in method can simply, quickly determine proposed adoption
Steel plate when carrying out cold forming, reach the coefficient of friction that matches needed for target springback capacity requirement, reduce corresponding friction system
Number optimization experimental work, so that fast implementing regulation steel plate and mold coefficient of friction reduces cold forming rebound purpose.
Specific embodiment
Further details of explanation is done to the present invention With reference to embodiment, it should be appreciated that this hair
Bright protection scope is not limited by the specific implementation.
The present invention is the method for a kind of regulation steel plate and the reduction cold forming rebound of mold coefficient of friction, is included the following steps
S01 establishes the yield strength of springback angle Δ α and steel plate, the tensile strength of steel plate, the tangent modulus of steel plate, steel plate
Bending angle and steel plate and mold between coefficient of friction relational expression, the relational expression is
A α=(A+B σs+Cσb+DT+(Eσb+F)μ)α
In formula: σsFor steel plate yield strength；σbFor tensile strength；T is tangent modulus；α is the bending angle of shaping workpiece；A,
B, C, D, E, F are constant；
S02 obtains springback angle, in substitution by different steel plate materials or changing coefficient of friction and carrying out cold punching pressing formation
State the value that A, B, C, D, E, F is calculated in formula.；
S03 obtains the σ of steel plate materials to be formed by mechanical property testss、σbAnd T, according to target springback angle and formula
Coefficient of friction needed for calculating between steel plate materials and mold to be formed；
The coefficient of friction that S04 adjusts between steel plate and mold keeps it consistent with gained coefficient of friction in S03.
Need to guarantee that each steel plate forming workpiece shapes are consistent when using A, B, C, D, E, F value in substitution method calculation formula.
Embodiment 1
By taking processing is bent U-shaped part as an example, Q235 (σ is first selectedsFor 235MPa, σbFor 380MPa, T 4100MPa), Q345
(σsFor 345MPa, σbFor 500MPa, T 4200MPa) and Q460 (σsFor 460MPa, σbFor 600MPa, T 4200MPa) progress
Cold punching pressing formation, proposed adoption SPFH590 is as new steel plate materials.
When measurement coefficient of friction is 0.08 and 0.1, U-shaped part bending angle is the springback angle at 90 °, as shown in table 1.
Under 1 different coefficients of friction of table, U-shaped part bending angle is the springback angle at 90 °
Based on 1 experimental result of table, it is -0.954, B 0.00196 that A, which is calculated, by least square method, and C is -0.00016,
It is -0.00264, F is -0.00264 that D, which is 0.000278, E,.Following relationship is met for the U-shaped part Δ α of the shape and μ
Δ α=(- 0.954+0.00196 σs+-0.00016σb+0.000278T+(-0.00264σb
+-0.00264)μ)α
For SPFH590 plate, experiment measures its σsFor 542MPa, σbFor 624MPa, T 4200MPa.The target of setting
Springback angle is 1.5 °, and it is 0.15 that the coefficient of friction that matches, which is calculated, mineral oil can be selected as lubricant according to table 2,
Springback angle is 1.3 ° at 90 ° of the part actually obtained, from the above, it can be seen that actual value is close to target springback angle.
2 lubricant of table and corresponding coefficient of friction
Embodiment 2
It is first to select 20 steel (σ at 45 ° for cold forming by bending angle in automobile buffer beamsFor 245MPa, σbFor
310MPa, T 2000MPa), 35 steel (σsFor 315MPa, σbFor 530MPa, T 2000MPa) and 45 steel (σsFor 355MPa, σb
Cold punching pressing formation is carried out for 600MPa, T 2100MPa), proposed adoption SZB600 is as new steel plate materials.
When measuring different coefficients of friction, springback angle at 45 ° of bending angle of part, as shown in table 3.
Cold forming under 3 different coefficients of friction of table, bending angle is the springback angle at 45 ° in automobile buffer beam
Based on 3 experimental result of table, it is -0.00291, C 0.001, D that by least square method, A is calculated, which is -1.01, B,
It is -0.000252, F for 0.000758, E is -0.255.Following relationship is met for the test specimen Δ α of the shape and μ
A α=(- 1.01+-0.00291 σs+0.001σb+0.000758T+(-0.000252σb
+-0.255)μ)α
For SZB600 plate, experiment measures σsFor 506MPa, σbFor 564MPa, T 2760MPa.The target of setting is returned
Playing angle is 1 °, and it is 0.13 that the coefficient of friction to match, which is calculated, obtains matched friction by changing mold surface roughness
Coefficient, springback angle is 0.97 ° at practical cold forming obtain 45 ° of part, from the foregoing, it will be observed that actual value is sprung back very close to target
Angle.
The above is only a preferred embodiment of the present invention, and the present invention is not limited in the content of embodiment.For in this field
Technical staff for, can have various change and change within the scope of technical solution of the present invention, made any variation and
Change, within that scope of the present invention.
Claims (6)
1. a kind of method that regulation steel plate and mold coefficient of friction reduce cold forming rebound, it is characterised in that: include the following steps
S01 establishes springback angleWith the bending of the yield strength, the tensile strength of steel plate, the tangent modulus of steel plate, steel plate of steel plate
The relational expression of coefficient of friction between angle and steel plate and mold, the relational expression are
In formula: σsFor steel plate yield strength；σbFor tensile strength；T is tangent modulus；α is the bending angle of shaping workpiece；A,B,C,
D, E, F are constant；
S02 substitution method acquires the value of described A, B, C, D, E, F；
S03 obtains the σ of steel plate materials to be formed by mechanical property testss、σbAnd T, it is calculated according to target springback angle and formula
Coefficient of friction needed between steel plate materials and mold to be formed；
The coefficient of friction that S04 adjusts between steel plate and mold keeps it consistent with gained coefficient of friction in S03.
2. the method that regulation steel plate according to claim 1 and mold coefficient of friction reduce cold forming rebound, feature exist
In: by change steel plate materials or change coefficient of friction carry out cold punching pressing formation, obtain springback angle and be calculated A, B, C, D,
E, the value of F.
3. the method that regulation steel plate according to claim 1 and mold coefficient of friction reduce cold forming rebound, feature exist
In: it is adjusted between the steel plate and mold by changing the lubricant medium between mold and steel plate or changing the roughness of mold
Coefficient of friction.
4. the method that regulation steel plate according to claim 1 and mold coefficient of friction reduce cold forming rebound, feature exist
In: the stress and strain relationship of the steel plate materials meets bilinear relation.
5. the method that regulation steel plate according to claim 3 and mold coefficient of friction reduce cold forming rebound, feature exist
In: the friction media is one of unlubricated, mineral oil, graphite oil, molybdenum disulfide or a variety of combinations.
6. the method that regulation steel plate according to claim 1 and mold coefficient of friction reduce cold forming rebound, feature exist
In: the coefficient of friction between the steel plate and mold is adjusted by changing the lubricant medium between mold and steel plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810965355.2A CN109325262B (en) | 2018-08-23 | 2018-08-23 | Method for reducing cold forming rebound by regulating friction coefficient between steel plate and die |
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|---|---|---|---|
| CN201810965355.2A CN109325262B (en) | 2018-08-23 | 2018-08-23 | Method for reducing cold forming rebound by regulating friction coefficient between steel plate and die |
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| CN109325262A true CN109325262A (en) | 2019-02-12 |
| CN109325262B CN109325262B (en) | 2024-01-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE543383C2 (en) * | 2019-04-29 | 2020-12-29 | Gestamp Hardtech Ab | A cold working apparatus and a method for cold working a blank |
| CN112345379A (en) * | 2020-09-02 | 2021-02-09 | 中国第一汽车股份有限公司 | Testing device and testing method for bending resilience characteristic of plate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102567577A (en) * | 2011-12-16 | 2012-07-11 | 沈阳飞机工业（集团）有限公司 | Rapid die compensation method considering rebound of bent part |
| CN203245680U (en) * | 2013-04-18 | 2013-10-23 | 湖南工业职业技术学院 | Lathe tool wear monitoring device based on titanium alloy machining |
| CN107590311A (en) * | 2017-08-08 | 2018-01-16 | 明阳智慧能源集团股份公司 | A kind of planetary drive gear-box Strength co-mputation integrated system |
-
2018
- 2018-08-23 CN CN201810965355.2A patent/CN109325262B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102567577A (en) * | 2011-12-16 | 2012-07-11 | 沈阳飞机工业（集团）有限公司 | Rapid die compensation method considering rebound of bent part |
| CN203245680U (en) * | 2013-04-18 | 2013-10-23 | 湖南工业职业技术学院 | Lathe tool wear monitoring device based on titanium alloy machining |
| CN107590311A (en) * | 2017-08-08 | 2018-01-16 | 明阳智慧能源集团股份公司 | A kind of planetary drive gear-box Strength co-mputation integrated system |
Non-Patent Citations (1)
| Title |
|---|
| 金先玉等: "6061铝合金超薄壁管的充液压弯数值模拟与试验", 《塑性工程学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE543383C2 (en) * | 2019-04-29 | 2020-12-29 | Gestamp Hardtech Ab | A cold working apparatus and a method for cold working a blank |
| CN112345379A (en) * | 2020-09-02 | 2021-02-09 | 中国第一汽车股份有限公司 | Testing device and testing method for bending resilience characteristic of plate |
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| CN109325262B (en) | 2024-01-26 |
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Effective date of registration: 20231225 Address after: No. 300 Guangxing Road, Kenli District, Dongying City, Shandong Province, 257500 Applicant after: DONGYING CHENHUI MACHINERY MANUFACTURING Co.,Ltd. Address before: 101200 room 205-211526, No. 40, Fuqian West Street, Pinggu town, Pinggu District, Beijing (cluster registration) Applicant before: BEIJING YONGBO TECHNOLOGY CO.,LTD. Effective date of registration: 20231225 Address after: 101200 room 205-211526, No. 40, Fuqian West Street, Pinggu town, Pinggu District, Beijing (cluster registration) Applicant after: BEIJING YONGBO TECHNOLOGY CO.,LTD. Address before: 1 No. 211167 Jiangsu city of Nanjing province Jiangning Science Park Hongjing Road Applicant before: NANJING INSTITUTE OF TECHNOLOGY |
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