CN107127274A - A kind of stamping parts of automobile reduction assay method - Google Patents
A kind of stamping parts of automobile reduction assay method Download PDFInfo
- Publication number
- CN107127274A CN107127274A CN201610115246.2A CN201610115246A CN107127274A CN 107127274 A CN107127274 A CN 107127274A CN 201610115246 A CN201610115246 A CN 201610115246A CN 107127274 A CN107127274 A CN 107127274A
- Authority
- CN
- China
- Prior art keywords
- punching press
- grid
- reduction
- along
- sheet metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
Abstract
The present invention relates to a kind of stamping parts of automobile reduction assay method, comprise the following steps:1) it is L in the metal sheet surface printing length of side before punching press0×L0Square net；2) parallel computing of square net will be printed with, by the network scanning after punching press into computer, and vertical coordinate system is set up on surface where grid；3) sheet metal is through reduction during biaxial tension deformation state：Δ t=(1 (L0×L0)/(LX×LY)) × 100%；4) sheet metal is through reduction during plane strain state：Δ t=(1 (L0/LX)) × 100%；5) then reduction is sheet metal during state after tension and compression deformation：Δ t=(1 (L0×L0)/(LX×LY)) × 100%；The present invention proposes one kind and can adapt to plate stamping actual production, can be while guarantee test efficiency, the method that can determine stamping parts reduction exactly again；This method can be readily applicable to press work scene, not limited by factors such as working environments.
Description
Technical field
The present invention relates to auto parts and components forming property assay method, more particularly to a kind of stamping parts of automobile reduction measure side
Method.
Background technology
Automobile body-in-white is mainly made up of the stamping part of automotive sheet, and current more than 65% stamping parts of automobile still uses steel
Plate cold punching pressing formation.As vehicle body parts design becoming increasingly complex, requirement to stamping quality also more and more higher.Therefore,
Automotive sheet stamping technology is always that domestic and international automobile production enterprise, steel mill and colleges and universities pay close attention to field.In Automobile Plate
In forming process, cracking can directly result in the failure of punching press drawing, therefore, at present generally using consideration numerical simulation and reality
The fiducial value and empirical data of punching press, select the maximum gauge reduction of blank as the matter of punching press drawing in actual production
Measure evaluation index.
Before, for the simple drip molding of shape matching, mainly using the conventional method of hand survey, before and after measurement sheet forming
Change value of thickness draws reduction, although simple to operate, but accuracy rate can not ensure that error is larger at all；This method due to
The inaccuracy of computational methods and lack adaptability because deformation of the plate in forming process is instantaneous, institute in this way
It is only limitted to forming property research of the scientific research institutions to automotive sheet, it is impossible to large-scale promotion to the line actual production of plate stamping one
In.
If can not have an accurately measure to auto parts punching course reduction, it will have a strong impact on Sheet Metal Forming Technology parameter
Formulation, and then cause part punching quality not ensure, percent defective can be increased, give the increase manufacture of auto parts manufacturing enterprise
Cost.
The content of the invention
The invention provides a kind of stamping parts of automobile reduction assay method, overcome existing assay method precision it is low, it is actual should
With the shortcoming of property difference, it is proposed that one kind can adapt to plate stamping actual production, can again may be used while guarantee test efficiency
Method to determine stamping parts reduction exactly；This method can be readily applicable to press work scene, not by working environment etc.
The limitation of factor.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of stamping parts of automobile reduction assay method, comprises the following steps:
1) it is the main forming section of metal sheet surface to the blanks of punching press auto parts and components under the conditions of without external force before punching press
It is L that the length of side is printed in position by the method for chemical attack0×L0Square net；
2) sheet metal for being printed with square net is placed in diel, starts stamping machine and carry out auto parts and components
It is stamping；After punching press, by the network scanning after punching press into computer, and power coordinate system is set up on the surface where grid,
The origin of the coordinate system is located at grid element center, FXAxle and FYAxle is parallel with 2 sides intersected of grid after punching press respectively；
3) sheet metal is through biaxial tension deformation state：Two external force applied are along FXAxle and FYAxle produces strain, becomes
The result of shape is exactly to make thin plate thinning；Grid is not only along F after punching pressXElongate axis is simultaneously also along FYElongate axis, if net after punching press
Lattice are along FXThe length of axle is LX, along FYThe length of axle is LY, then the area of grid is L after punching pressX×LY；Reduction is：
Δ t=(1- (L0×L0)/(LX×LY)) × 100%；
4) sheet metal is through plane strain state：Sheet metal is protruded upward in pulling force FX side, after the punching press for producing strain
Grid and pulling force FXThe length of side of parallel direction is changed into LX, and more than L0, reduction is：
Δ t=(1- (L0/LX)) × 100%；
5) sheet metal state after tension and compression deformation：Make material elongation along the pulling force of FX direction of principal axis after strain, along FYDirection of principal axis
The effect of compression stress promote after Material shrinkage, punching press grid along FXThe length of side of direction of principal axis is LX, along FYThe length of side of direction of principal axis
For LY；The area of grid is L after punching pressX×LY；, then reduction be：
Δ t=(1- (L0×L0)/(LX×LY)) × 100%；
Due to LX＞ L0, LY＜ L0, i.e. material produces elongation normal strain in one direction, and compression is produced on another direction
Negative strain, material may locally be thickened, thinning or holding is constant；If calculate in reduction be negative value, show stamping parts by
Wrinkled in compression stress, that is, generate stamping parts defect.
Compared with prior art, the beneficial effects of the invention are as follows：
Overcome the low shortcoming of existing assay method precision, it is proposed that one kind can adapt to plate stamping actual production, can protect
While confirmatory test efficiency, the method that can determine stamping parts reduction exactly again；This method can be readily applicable to presser
Make scene, do not limited by factors such as working environments.
Brief description of the drawings
Fig. 1 is of the present invention in the schematic diagram without printing square net on stamping sheet metal.
Fig. 2 is the state diagram of grid after sheet metal of the present invention is deformed through biaxial tension.
Fig. 3 is the state diagram of sheet metal of the present invention grid after plane strain.
Fig. 4 is the state diagram of sheet metal of the present invention grid after tension and compression deformation.
In figure：1. the grid of sheet metal 2.
Embodiment
The embodiment to the present invention is described further below in conjunction with the accompanying drawings：
A kind of stamping parts of automobile reduction assay method, comprises the following steps:
1) it is the main shaping on the surface of sheet metal 1 to the blanks of punching press auto parts and components under the conditions of without external force before punching press
It is L that the length of side is printed in position by the method for chemical attack0×L0Square net 2；(as shown in Figure 1)
2) sheet metal 1 for being printed with square net 2 is placed in diel, starts stamping machine and carry out zero, automobile
Part it is stamping；After punching press, the grid 2 after punching press is scanned in computer, and sets up vertical on the place surface of grid 2
Straight coordinate system, the origin of the coordinate system is located at the center of grid 2, FXAxle and FY2 phases of axle respectively with grid after punching press 2
The side of friendship is parallel；
3) sheet metal 1 is through biaxial tension deformation state (as shown in Figure 2)：Two external force applied are along FXAxle and FY
Axle produces strain, and the result of deformation is exactly to make thin plate thinning；Grid 2 is not only along F after punching pressXElongate axis is simultaneously also along FY
Elongate axis, if grid 2 is along F after punching pressXThe length of axle is LX, along FYThe length of axle is LY, then after punching press grid 2 face
Product is LX×LY；Reduction is：
Δ t=(1- (L0×L0)/(LX×LY)) × 100%；
4) sheet metal 1 is through plane strain state (as shown in Figure 3)：Sheet metal 1 is in pulling force FXSide protrude upward,
Produce grid 2 and pulling force F after the punching press of strainXThe length of side of parallel direction is changed into LX, and more than L0, reduction is：
Δ t=(1- (L0/LX)) × 100%；
5) state (as shown in Figure 4) after tension and compression deformation of sheet metal 1：Along F after strainXThe pulling force of direction of principal axis stretches material
It is long, along FYThe effect of the compression stress of direction of principal axis promotes after Material shrinkage, punching press grid 2 along FXThe length of side of direction of principal axis is LX,
Along FYThe length of side of direction of principal axis is LY；The area of grid 2 is L after punching pressX×LY；, then reduction be：
Δ t=(1- (L0×L0)/(LX×LY)) × 100%；
Due to LX＞ L0, LY＜ L0, i.e. material produces elongation normal strain in one direction, and compression is produced on another direction
Negative strain, material may locally be thickened, thinning or holding is constant；If calculate in reduction be negative value, show stamping parts by
Wrinkled in compression stress, that is, generate stamping parts defect.
The method of the invention can be readily applicable to press work scene, not limited by factors such as working environments.Grid lines leads to
Crossing portable grid printing system (including power supply, electrolyte, waffle slab, roller etc.) can draw, its is simple to operate,
Be easily mastered, it is convenient and swift, therefore can be with wide popularization and application in production line.
Due to carrying out grid drawing using waffle slab, grid printing direction can be easily adjusted, it is general to be hung down using grid sideline
Directly in the direction of maximum drawing effects of strain power, the accuracy of reduction measure can be so improved.
Following examples are implemented lower premised on technical solution of the present invention, give detailed embodiment and specific
Operating process, but protection scope of the present invention is not limited to following embodiments.Method therefor such as nothing is especially said in following embodiments
Bright is conventional method.
【Embodiment 1】
Under the conditions of without external force, print 2mm × 2mm's by the method for chemical attack on sheet metal 1 before formation
Square net 2, to measure the deformation of material.
The sheet metal 1 for being printed with square net 2 is placed in diel, starts stamping machine and carries out auto parts and components
It is stamping.Stamping parts surface mesh 2 after deformation is scanned into computer, the new grid area L to be formed is measuredX×LY。
In the present embodiment, LX＞ 2mm, LY＞ 2mm, the strained condition for representing the net region is exactly so-called two-way auxetic shape
State.The only criterion of twin shaft auxetic is：The last size on the surface of sheet metal 1 is in two principal directions on surface all than original
Size is big, and the result of deformation is exactly to make sheet metal 1 thinning.
Survey to obtain LX=2.3mm, LY=2.2mm, then the reduction of the net region be：
Δ t=(1- (L0×L0)/(LX×LY)) × 100%=20.95%；
【Embodiment 2】
Under the conditions of without external force, print 2mm × 2mm's by the method for chemical attack on sheet metal 1 before formation
Square net 2, to measure the deformation of material.
The sheet metal 1 for being printed with square net 2 is placed in diel, starts stamping machine and carries out auto parts and components
It is stamping.Stamping parts surface mesh 2 after deformation is scanned into computer, the new grid area L to be formed is measuredX×LY。
In the present embodiment, LX＞ 2mm, LY＜ 2mm, represent that material produces elongation normal strain, another side in one direction
Negative strain is compressed to producing.In this case, material may locally thicken, it is thinning or keep it is constant.As material is thickened, meter
Then reduction is possible to as negative value in calculation, and this indicates that stamping parts is wrinkled due to compression stress, and this, which is also that stamping parts is another, lacks
The sunken form of expression.
Survey to obtain LX=2.2mm, LY=1.8mm, then the reduction of the net region be：
Δ t=(1- (L0×L0)/(LX×LY)) × 100%=-1.01%；(actually thickening)
The strain of grid after punching press in above example is uniformly processed, punching press of the stamping parts in the region is can obtain and is thinned
Rate cloud atlas, and the maximum reduction of the punching press in the region is obtained, and then judge punching performance of the stamping parts in actual production.
In above-described embodiment, employ the sheet metal with grid to measure and describe the basic strain regime that may occur,
Their common primary conditions are：The power applied is all acted in the vertical direction of printed side length of element.If
Power is acted in non-vertical direction, with same principle, can equally be used gridding method, be obtained stamping parts and concentrate strain regions material
Expect strain regime, and then solve the defects such as stamping parts cracking, corrugation or resilience.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, appoint
What those familiar with the art the invention discloses technical scope in, technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (1)
1. a kind of stamping parts of automobile reduction assay method, it is characterised in that comprise the following steps:
1) it is the main forming section of metal sheet surface to the blanks of punching press auto parts and components under the conditions of without external force before punching press
It is L that the length of side is printed in position by the method for chemical attack0×L0Square net；
2) sheet metal for being printed with square net is placed in diel, starts stamping machine and carry out auto parts and components
It is stamping；After punching press, by the network scanning after punching press into computer, and power coordinate system is set up on the surface where grid,
The origin of the coordinate system is located at grid element center, FXAxle and FYAxle is parallel with 2 sides intersected of grid after punching press respectively；
3) sheet metal is through biaxial tension deformation state：Two external force applied are along FXAxle and FYAxle produces strain, becomes
The result of shape is exactly to make thin plate thinning；Grid is not only along F after punching pressXElongate axis is simultaneously also along FYElongate axis, if net after punching press
Lattice are along FXThe length of axle is LX, along FYThe length of axle is LY, then the area of grid is L after punching pressX×LY；Reduction is：
Δ t=(1- (L0×L0)/(LX×LY)) × 100%；
4) sheet metal is through plane strain state：Sheet metal is in pulling force FXSide protrude upward, produce strain punching press after
Grid and pulling force FXThe length of side of parallel direction is changed into LX, and more than L0, reduction is：
Δ t=(1- (L0/LX)) × 100%；
5) sheet metal state after tension and compression deformation：Along F after strainXThe pulling force of direction of principal axis makes material elongation, along FYDirection of principal axis
The effect of compression stress promote after Material shrinkage, punching press grid along FXThe length of side of direction of principal axis is LX, along FYThe length of side of direction of principal axis
For LY；The area of grid is L after punching pressX×LY；, then reduction be：
Δ t=(1- (L0×L0)/(LX×LY)) × 100%；
Due to LX＞ L0, LY＜ L0, i.e. material produces elongation normal strain in one direction, and compression is produced on another direction
Negative strain, material may locally be thickened, thinning or holding is constant；If calculate in reduction be negative value, show stamping parts by
Wrinkled in compression stress, that is, generate stamping parts defect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610115246.2A CN107127274A (en) | 2016-02-29 | 2016-02-29 | A kind of stamping parts of automobile reduction assay method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610115246.2A CN107127274A (en) | 2016-02-29 | 2016-02-29 | A kind of stamping parts of automobile reduction assay method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107127274A true CN107127274A (en) | 2017-09-05 |
Family
ID=59721286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610115246.2A Pending CN107127274A (en) | 2016-02-29 | 2016-02-29 | A kind of stamping parts of automobile reduction assay method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107127274A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068500A (en) * | 2019-04-17 | 2019-07-30 | 清华大学苏州汽车研究院（相城） | A kind of limit attenuating rate mechanism for testing |
| CN112231892A (en) * | 2020-09-09 | 2021-01-15 | 包头钢铁（集团）有限责任公司 | Qualitative and quantitative analysis method for comprehensively evaluating reliability of stamping simulation result |
| CN112964579A (en) * | 2021-02-09 | 2021-06-15 | 鞍钢股份有限公司 | Method for judging stamping forming performance of automobile steel plate by using limit rupture thickness reduction rate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3853000A (en) * | 1971-02-23 | 1974-12-10 | Peak Components Ltd | Strain measuring transducer |
| CN86207032U (en) * | 1986-09-16 | 1987-11-11 | 华中工学院 | Fast measuring grid for deformation measurement |
| CN103934313A (en) * | 2014-04-28 | 2014-07-23 | 仪征申威冲压有限公司 | Grid strain analysis method for thin plate forming and application of method |
| CN105180886A (en) * | 2015-09-06 | 2015-12-23 | 安徽工业大学 | Method for measuring strain distribution of cold rolled sheet steel |
-
2016
- 2016-02-29 CN CN201610115246.2A patent/CN107127274A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3853000A (en) * | 1971-02-23 | 1974-12-10 | Peak Components Ltd | Strain measuring transducer |
| CN86207032U (en) * | 1986-09-16 | 1987-11-11 | 华中工学院 | Fast measuring grid for deformation measurement |
| CN103934313A (en) * | 2014-04-28 | 2014-07-23 | 仪征申威冲压有限公司 | Grid strain analysis method for thin plate forming and application of method |
| CN105180886A (en) * | 2015-09-06 | 2015-12-23 | 安徽工业大学 | Method for measuring strain distribution of cold rolled sheet steel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068500A (en) * | 2019-04-17 | 2019-07-30 | 清华大学苏州汽车研究院（相城） | A kind of limit attenuating rate mechanism for testing |
| CN112231892A (en) * | 2020-09-09 | 2021-01-15 | 包头钢铁（集团）有限责任公司 | Qualitative and quantitative analysis method for comprehensively evaluating reliability of stamping simulation result |
| CN112231892B (en) * | 2020-09-09 | 2022-11-18 | 包头钢铁（集团）有限责任公司 | Qualitative and quantitative analysis method for comprehensively evaluating reliability of stamping simulation result |
| CN112964579A (en) * | 2021-02-09 | 2021-06-15 | 鞍钢股份有限公司 | Method for judging stamping forming performance of automobile steel plate by using limit rupture thickness reduction rate |
| CN112964579B (en) * | 2021-02-09 | 2022-05-20 | 鞍钢股份有限公司 | Method for judging stamping forming performance of automobile steel plate by using limit rupture thickness reduction rate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107127274A (en) | A kind of stamping parts of automobile reduction assay method | |
| CN102847767A (en) | Punching processing quality control method of large-scale covering component | |
| CN103433380A (en) | Raised forming method of drawing mould of automobile panel | |
| Pohlak et al. | Manufacturability and limitations in incremental sheet forming | |
| CN107219123A (en) | The method and clamping device of a kind of cross bonding method measurement bonding chip intensity | |
| CN103424318A (en) | Method for determination of forming limit curve of sheet metal | |
| CN103302186A (en) | Intelligent pressure detection stamping die | |
| CN203448522U (en) | Intelligent pressure detection stamping die | |
| CN203541190U (en) | General flanging tool | |
| CN102359774A (en) | Real-time strain measurement apparatus for stamping and forming and test method thereof | |
| CN102814448B (en) | Manufacture method and die for producing pallet fork with thickened bottom | |
| CN206316176U (en) | A kind of bent plate pressing machine with measuring angle function | |
| CN103934313A (en) | Grid strain analysis method for thin plate forming and application of method | |
| CN102759505B (en) | Auxiliary device for medium plate material compression test and measuring method for flowing stress curve | |
| Zhang et al. | Experimental and numerical study on one flexible incremental bending process | |
| CN111595697A (en) | Method for judging shearing resistance forming capability of material in stamping process | |
| Yan et al. | A study of hole flanging-upsetting process | |
| CN203508769U (en) | V-shaped bending die | |
| CN203764784U (en) | Bending machine die for ninthly-bent workpiece | |
| CN204194573U (en) | Engine toothed chain carrier bar continuous stamping die | |
| CN104001762A (en) | Flexibility compensation method for large-scale bending machine die | |
| CN206065227U (en) | A kind of anti-corrugation punch in oil filler seat drawing and forming | |
| CN103317025B (en) | A kind of intelligent pressure detection supercharging diel | |
| CN109783762B (en) | Aluminum alloy multi-procedure non-proportional loading formability evaluation method | |
| CN202367069U (en) | Novel device of automobile exhaust pipe hanger |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170905 |