CN108398329A - A method of autobody sheet application performance is differentiated to reduction based on thickness - Google Patents
A method of autobody sheet application performance is differentiated to reduction based on thickness Download PDFInfo
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- CN108398329A CN108398329A CN201710064831.9A CN201710064831A CN108398329A CN 108398329 A CN108398329 A CN 108398329A CN 201710064831 A CN201710064831 A CN 201710064831A CN 108398329 A CN108398329 A CN 108398329A
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- application performance
- reduction
- punching press
- autobody sheet
- strain
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention provide it is a kind of based on thickness to reduction differentiate autobody sheet application performance method L is printed on the detection model after blanking using the method for chemical attack or Freehandhand-drawing0×L0Square net, the detection model to printing square net carried out punching press in kind, is measured to the strain value for detecting model after punching press using portable Strain Analysis System, and rectangular size of mesh opening variation is L after punching press1×L2；The thick to reduction Δ t of test piece after punching press is calculated using formula；For car inner plate part steel plate, if Δ t≤25%, show that the application performance of the autobody sheet is met the requirements；For automobile exterior panel part steel plate, if 2%≤Δ t≤20%, the application performance of the autobody sheet is met the requirements.The present invention calculates thickness to reduction by the method for measuring strain, fast can accurately reflect the practical application performance of autobody sheet, is not necessarily to special sample preparation, is not limited by factors such as working environments, easy to operate, is easily mastered.
Description
Technical field
It is the invention belongs to plate property detection field, more particularly to a kind of to differentiate autobody sheet application to reduction using thick
The method of performance.
Background technology
Autobody sheet depends primarily on the quality of its application performance in the extensive use and popularization of automobile factory.To autobody sheet
Application performance there are one accurately differentiate, it will promoted autobody sheet and mold matching degree, improve the use of autobody sheet
Efficiency and the productivity of auto parts and components punching press.
In the method for discrimination of traditional autobody sheet application performance, mainly commented according to practical stamping result
Valence, if steel plate is considered as reaching needed for user in punching course without there is apparent cracking；On the contrary, if there is punching press
The defect of cracking, it is necessary to more conversion materials.There is no wrinkle in view of surface of steel plate, shape insufficient draw for such method of discrimination
The invisible defects such as the insufficient rigidity risen, therefore the method for discrimination is too general for modern cars manufacturing enterprise, not
The high standards of auto parts and components selection can be met, the matching degree between autobody sheet and mold can be seriously affected, cause " to close
Suitable material cannot be applied on suitable part " so that causing the waste of material cost.
Invention content
The present invention is directed to overcome the defect of traditional method of discrimination, proposition is a kind of to differentiate automobile using material thickness to reduction
The method of steel plate application performance, so as to while the accurately application performance of evaluation Automobile Plate, ensure that parts select
Material is accurate and the raising of production efficiency.
For this purpose, the technical solution that the present invention is taken is：
A method of autobody sheet application performance is differentiated to reduction based on thickness, by autobody sheet application performance with it is thick to
Reduction connects, and Forming Limit of Sheet Metals theory and metal stresses strain is combined, by accurately measuring automobile steel
Strain value of the plate in punching course calculates autobody sheet punching press thickness to reduction, and then to the application performance of autobody sheet
Make effective differentiation；Its specific method and step are：
(1) detection model is prepared：Using the method for chemical attack or Freehandhand-drawing, ruler is printed on the detection model after blanking
Very little is L0×L0The square net of mm, and 0 ＜ L0≤4mm。
(2) model punching press is detected：Punching press in kind is carried out to the detection model for having produced square net using press machine.
(3) strain value measures：The strain value that model is detected after punching press is measured using portable Strain Analysis System,
The strain of square net long axis is set as ε1, the strain of short axle is ε2。
(4) it calculates thick to reduction：
A. after detecting the stamped forming of model, the square net change in size of surface printing is：L1×L2Mm, wherein L1With
L2To detect the measured value of model size of mesh opening variation after punching press；
B. according to constancy of volume principle in METHOD IN METAL FORMING PROCESSES, the area change of square net and thickness change have been contacted
Come, the thick to reduction Δ t of test piece after punching press is calculated using following formula：
Wherein, ε1=ln (L1/L0), ε2=ln (L2/L0)。
The application performance of the autobody sheet is differentiated to reduction value Δ t according to thickness：For car inner plate part steel plate, if Δ
T≤25% then shows that the application performance of the autobody sheet is met the requirements；For automobile exterior panel part steel plate, if 2%≤Δ t≤
20%, then the application performance of the autobody sheet meet the requirements.
Beneficial effects of the present invention are：
Thickness is introduced into reduction value in method of discrimination by the present invention, overcomes testing result existing for traditional method of discrimination
General rough problem calculates thickness to reduction by the method for measuring strain, is not necessarily to special sample preparation, utilizes strain analysis system
System measures the strain of model, therefore can quickly and easily reflect the field application performance of autobody sheet.Meanwhile this
Inventive method can be readily applicable to press work scene, not limited by factors such as working environments.Grid lines passes through portable net
Lattice printing system is drawn, convenient and efficient.Therefore, this method can be widely used to promote in production line, easy to operate, be easy the palm
It holds.
Specific implementation mode
Embodiment 1：
It chooses using plate material in Mr. Yu's vehicle back door, thickness is that the ultra-low-carbon steel DC06 samples of 0.8mm are applied
The differentiation of performance.
1, in Automobile Plate punching press site of deployment, size is printed by the method for chemical attack to the specimen surface after blanking
For the square net of 4 × 4mm.
2, scene carries out punching press using press machine to the model for having printed grid.
3, it is scanned and is transferred to computer to stamping parts specimen surface grid, scan grid lines, calculate surface
The strain of the strain value of grid, long axis is ε1, the strain of short axle is ε2.Through measuring：L1=4.94mm, L2=4.016mm, ε1=
0.211, ε2=0.004.
4, formula is utilizedCalculate the thick to reduction Δ t of the modelmax=24%.
Since the material model is applied to car inner plate part, be computed obtain the model it is thick to reduction value Δ t≤
25%, illustrate that the application performance of ultra-low-carbon steel DC06 materials meets the back door inner plate part requirement.
Comparative example 1：
It chooses and is applied using the DP590 material samples that reinforcement plate material thickness is 1.8mm in Mr. Yu's vehicle rear wheel cover
The differentiation of performance.
After material punching press, the thick to reduction Δ t of the model is calculatedmax=26.2%, Δ t ＞ 25%, material occur
The defect that apparent constriction even ruptures, causes stamping parts to be scrapped, therefore differentiate that the application performance of the DP590 materials cannot meet
Reinforcing plate part requirements in the rear wheel cover.
Embodiment 2：
It chooses and carries out application performance using the DC04 material samples that Mr. Yu's vehicle engine hood outer panel material thickness is 0.7mm
Differentiation.
1, in Automobile Plate punching press site of deployment, printing size by the method for chemical attack to the specimen surface after blanking is
2 × 2mm square nets.
2, scene carries out punching press using press machine to the model for having printed grid.
3, it is scanned and is transferred to computer to stamping parts specimen surface grid, scan grid lines, calculate surface
The strain value of grid, the strain stress of long axis1=0.128, the strain stress of short axle2=0.007.
4, after the stamped forming of model, the square net change in size of surface printing is：L1=2.27mm, L2=
2.014mm。
Utilize formulaCalculate the thick to reduction Δ t of the modelmax=14%.
Since the model is applied to automobile exterior panel part, it is computed and obtains the thick to reduction Δ t≤25%, explanation of the model
The application performance of the DC04 materials meets engine hood outer panel part requirements.
Comparative example 2：
The HS260LA material samples for being 0.7mm using the outer plate material thickness of Mr. Yu's vehicle seat baffle are chosen to apply
The differentiation of performance.
After material punching press, the thick to reduction Δ t of the model is calculatedmax=10.8%, Δ tmin=-5.3%, material does not have
There is generation cracking defect, but thickness is negative value to reduction minimum value, illustrates the phenomenon that regional area thickens, that is, to rise
The defect of wrinkle causes stamping parts to scrap or subsequent soldering processes is caused serious problems occur, therefore differentiates the HS260LA materials
Application performance cannot meet the requirements of the seat stop features.
Claims (1)
1. a kind of method differentiating autobody sheet application performance to reduction based on thickness, which is characterized in that by autobody sheet application
Performance is connected with thickness to reduction, Forming Limit of Sheet Metals theory and metal stresses strain is combined, by accurately surveying
Strain value of the autobody sheet in punching course is measured, calculates autobody sheet punching press thickness to reduction, and then to autobody sheet
Application performance make effective differentiation；Its specific method and step are：
(1) detection model is prepared：Printing size using the method for chemical attack or Freehandhand-drawing, on the detection model after blanking is
L0×L0The square net of mm, and 0 ＜ L0≤4mm；
(2) model punching press is detected：Punching press in kind is carried out to the detection model for having produced square net using press machine；
(3) strain value measures：The strain value for detecting model after punching press is measured using portable Strain Analysis System, is set
The strain of square net long axis is ε1, the strain of short axle is ε2；
(4) it calculates thick to reduction：
A. after detecting the stamped forming of model, the square net change in size of surface printing is：L1×L2Mm, wherein L1And L2For
The measured value of model size of mesh opening variation is detected after punching press；
B. according to constancy of volume principle in METHOD IN METAL FORMING PROCESSES, the area change of square net is connected with thickness change,
The thick to reduction Δ t of test piece after punching press is calculated using following formula：
Wherein, ε1=ln (L1/L0), ε2=ln (L2/L0)；
The application performance of the autobody sheet is differentiated to reduction value Δ t according to thickness：For car inner plate part steel plate, if Δ t≤
25%, then show that the application performance of the autobody sheet is met the requirements；For automobile exterior panel part steel plate, if 2%≤Δ t≤
20%, then the application performance of the autobody sheet meet the requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710064831.9A CN108398329A (en) | 2017-02-05 | 2017-02-05 | A method of autobody sheet application performance is differentiated to reduction based on thickness |
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|---|---|---|---|
| CN201710064831.9A CN108398329A (en) | 2017-02-05 | 2017-02-05 | A method of autobody sheet application performance is differentiated to reduction based on thickness |
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| CN108398329A true CN108398329A (en) | 2018-08-14 |
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| CN201710064831.9A Pending CN108398329A (en) | 2017-02-05 | 2017-02-05 | A method of autobody sheet application performance is differentiated to reduction based on thickness |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109731946A (en) * | 2019-01-24 | 2019-05-10 | 中车青岛四方机车车辆股份有限公司 | A kind of hot press-formed process certification method of aluminum alloy plate materials |
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| CN101598720A (en) * | 2009-06-26 | 2009-12-09 | 东北大学 | A kind of experimental technique of setting up forming limit diagram of transformation induced plasticity steel plate |
| CN101657712A (en) * | 2007-04-12 | 2010-02-24 | 新日本制铁株式会社 | Breakage prediction method, calculation processing device, program, and recording medium |
| CN102156080A (en) * | 2011-04-02 | 2011-08-17 | 山东建筑大学 | Testing device and testing method for establishing high-temperature formed limit diagram of ultrahigh-strength boron steel plate |
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| CN103323471A (en) * | 2013-05-14 | 2013-09-25 | 青岛理工大学 | Quantitative prediction method of retained austenite transformation in incremental forming process of TRIP steel plate material |
| CN103398909A (en) * | 2013-08-05 | 2013-11-20 | 大连理工大学 | Method for acquiring metal temperature forming limit diagram (TFLD) and testing device therefor |
| CN103512802A (en) * | 2013-09-25 | 2014-01-15 | 马钢(集团)控股有限公司 | Testing method for measuring plane strain points in thin steel sheet forming limit diagram |
| CN104931332A (en) * | 2015-05-11 | 2015-09-23 | 首钢总公司 | Time-based sheet forming limit determination method |
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2017
- 2017-02-05 CN CN201710064831.9A patent/CN108398329A/en active Pending
Patent Citations (8)
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|---|---|---|---|---|
| CN101657712A (en) * | 2007-04-12 | 2010-02-24 | 新日本制铁株式会社 | Breakage prediction method, calculation processing device, program, and recording medium |
| CN101598720A (en) * | 2009-06-26 | 2009-12-09 | 东北大学 | A kind of experimental technique of setting up forming limit diagram of transformation induced plasticity steel plate |
| CN102156080A (en) * | 2011-04-02 | 2011-08-17 | 山东建筑大学 | Testing device and testing method for establishing high-temperature formed limit diagram of ultrahigh-strength boron steel plate |
| CN102749253A (en) * | 2012-07-10 | 2012-10-24 | 首钢总公司 | Testing system and method of plate high temperature forming limit diagram |
| CN103323471A (en) * | 2013-05-14 | 2013-09-25 | 青岛理工大学 | Quantitative prediction method of retained austenite transformation in incremental forming process of TRIP steel plate material |
| CN103398909A (en) * | 2013-08-05 | 2013-11-20 | 大连理工大学 | Method for acquiring metal temperature forming limit diagram (TFLD) and testing device therefor |
| CN103512802A (en) * | 2013-09-25 | 2014-01-15 | 马钢(集团)控股有限公司 | Testing method for measuring plane strain points in thin steel sheet forming limit diagram |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109731946A (en) * | 2019-01-24 | 2019-05-10 | 中车青岛四方机车车辆股份有限公司 | A kind of hot press-formed process certification method of aluminum alloy plate materials |
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Application publication date: 20180814 |