CN104655503B - Determine the device and test method of metal sheet forming limiting figure left-half - Google Patents
Determine the device and test method of metal sheet forming limiting figure left-half Download PDFInfo
- Publication number
- CN104655503B CN104655503B CN201410846372.6A CN201410846372A CN104655503B CN 104655503 B CN104655503 B CN 104655503B CN 201410846372 A CN201410846372 A CN 201410846372A CN 104655503 B CN104655503 B CN 104655503B
- Authority
- CN
- China
- Prior art keywords
- sample
- cylindrical roller
- lifting body
- lowering
- hoisting gear
- 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.)
- Expired - Fee Related
Links
- 239000002184 metal Substances 0.000 title claims abstract description 25
- 238000010998 test method Methods 0.000 title claims description 7
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 238000010586 diagram Methods 0.000 claims description 5
- 238000003854 Surface Print Methods 0.000 claims description 2
- 239000000523 sample Substances 0.000 abstract description 79
- 238000002474 experimental method Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 12
- 238000005259 measurement Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a kind of device for determining metal sheet forming limiting figure left-half, belong to Sheet metal forming field.Including two sample fixed mechanisms and sample lifting body, described two sample fixed mechanisms are arranged on the both sides of sample lifting body；The sample lifting body includes cylindrical roller and lowering or hoisting gear, and cylindrical roller is erected at the top of lowering or hoisting gear, and the lowering or hoisting gear drives cylindrical roller to move up and down.Being gradually increasing by cylindrical roller makes the two ends of sample rupture occur or directly disconnect, because usual one end of sample material ruptures in advance or disconnects, the critical condition that now other end ruptures just at firm necking down or just, so as to solve the unmanageable problem of critical condition of the firm necking down of sample or rupture, then measuring the strain in this region can more accurately draw the left-half of strain limit figure.Invention additionally discloses a kind of experimental technique for determining metal sheet forming limiting figure left-half.
Description
Technical field
It is especially a kind of measure metal sheet forming the present invention relates to a kind of measure device and method of forming limit diagram
The device and method of limiting figure left-half, belongs to Sheet metal forming field.
Background technology
Sheet metal forming limit refers to the limiting strain during metal plastic deformation.The survey of existing forming limit diagram
Determining method is carried out on common sheet material forming testing machine using spherical or cylindrical punch.The bone that sample is used
Capitiform sample, the purpose is to make plate be broken in middle part, is easy to observe and obtain required strain paths, such as Fig. 1
It is shown.
But during actual tests, as shown in Fig. 2 forming acquisition shaping pole to plate using hemispherical punch
During limit figure, because the compression between plate and drift is larger, cause frictional force larger, often cause the plate cannot be from centre
Fracture, cannot get required strain regime；Additionally, the plate after deformation is three-dimension curved surface state, the grid of measurement surface must
Special three-dimension measuring system must be used, measurement difficulty and efficiency is increased.
When carrying out acquisition forming limit diagram to plate using cylindrical punch, because there is larger frictional force in fillet position,
Sample is easily broken from fillet position.Therefore, it is necessary to from centre plus the preferable plate of with holes and plasticity as pad.
Above two method when sample fracture is judged, all using the damped method or eye-observation of power, but, sample is firm
Necking down or just cracking critical condition observed very rambunctious just right only by human eye, often sample can directly disconnect and
Often at cavity plate aperture and near drawbead, this has resulted in the rendering error of post forming limiting figure for the position of specimen broke
It is larger in addition cause experiment it is invalid.
The content of the invention
The technical problems to be solved by the invention are to overcome prior art defect, there is provided a kind of accurate Control Assay of energy is firm
Necking down or just cracking critical condition, with improve test accuracy measure metal sheet forming limiting figure left-half device and
Method.
In order to solve the above-mentioned technical problem, the dress of the measure metal sheet forming limiting figure left-half that the present invention is provided
Put, including two sample fixed mechanisms and sample lifting body, described two sample fixed mechanisms are arranged on sample lifting body
Both sides；The sample lifting body includes cylindrical roller and lowering or hoisting gear, and cylindrical roller is erected at the upper of lowering or hoisting gear
Side, the lowering or hoisting gear drives cylindrical roller to move up and down.
Used as improvement, the cylindrical roller surface is circumferentially arranged with several strip projected parts.
Used as improvement, the sample fixed mechanism includes cavity plate and blank holder, and the blank holder is located at the lower section of cavity plate, institute
The upper surface of the lower surface and blank holder of stating cavity plate is serrated；Saw on the lower surface of the cavity plate and the upper surface of blank holder
Tooth height is gradually reduced by the inner side of outer laterally closer sample lifting body.
In order to solve the above-mentioned technical problem, metal sheet forming limiting figure left-half is determined present invention also offers one kind
Test method, the method uses said apparatus, comprises the following steps：
1) sample, is cut, the sample is elongated, sample axial direction opens up two recesses, sample axial direction on two sides
Two side notch position correspondences；
2）, specimen surface print grid；
3）, the two ends of sample are gripped respectively by sample fixed mechanism respectively, the middle part of sample is located in cylinder
On shape roller,
4）, stop after the side of the upward jacking cylindrical roller of lowering or hoisting gear to sample disconnects；
5）, sample opposite side be in necking down or firm state of rupture, measure this region strain data draw make shaping pole
Limit the left-half of figure.
The beneficial effects of the present invention are：（1）, by cylindrical roller be gradually increasing using sample two ends occur rupture
Or directly disconnect, because there is one end rupture or disconnection in advance in the reason such as internal structure skewness, positioning of sample material,
The critical condition that now other end ruptures just at firm necking down or just, so as to solve the critical shape of the firm necking down of sample or rupture
The unmanageable problem of state, then measuring the strain in this region can more accurately draw the left-half of strain limit figure；
（2）, on cylindrical roller surface circumferentially arranged with several strip projected parts, can to increase the contact with sample during jacking,
Sample is prevented to be moved in process of the test；（3）, the lower surface of cavity plate and the upper surface of blank holder are in sample fixed mechanism
Zigzag, sawtooth is gradually increased by near the Inside To Outside of sample lifting body, it is possible to use the clamping of sample is more firm
Stabilization, and prevent sample from the portion fractures being held down；（4）, by the elongated setting of sample, sample is axially opened on two sides
If two recesses, axially two side notch positions are corresponding for sample, and the two ends of sample are separately fixed at sample and fix in process of the test
In mechanism, sample middle part is located on cylindrical roller, and the recess on sample is located at sample fixed mechanism and cylindrical roller respectively
Between, such sample is more prone to be broken, and one end is broken, and because power is lax, other side is no longer influenced by big drawing
Power, can keep critical condition；Meanwhile, test specimen fracture position is plane, is easy to measuring strain data.
Brief description of the drawings
Fig. 1 is the structural representation of existing measure device；
Fig. 2 is existing test sample shape graph；
Fig. 3 is the structural representation of apparatus of the present invention；
Fig. 4 is the top view of apparatus of the present invention；
Fig. 5 is A portions enlarged drawing；
Fig. 6 is cylindrical roller structure chart；
Fig. 7 is experiment specimen shape figure in the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in Figures 3 and 4, the device of metal sheet forming limiting figure left-half, including two examinations are determined in the present invention
Sample fixed mechanism and sample lifting body.Two sample fixed mechanisms are arranged on the both sides of sample lifting body.Sample jack
Structure includes cylindrical roller 2, central rotating shaft 3, support 4 and hydraulic pump 7, and central rotating shaft 3 passes through cylindrical roller 2, cylinder rolling
Wheel 2 can freely be rotated around central rotating shaft 3, and the two ends of central rotating shaft 3 are supported on support 4, and the bottom of support 4 is connected with hydraulic pump 7,
Hydraulic pump 7 drives cylindrical roller 2 to move up and down by support 4.Sample fixed mechanism includes cavity plate 5 and blank holder 6, cavity plate 5
Positioned at the top of blank holder 6, the lower surface of cavity plate 5 can be in contact with the upper surface of blank holder 6.The two ends of sample 1 are clamped in respectively
On two sample fixed mechanisms, the middle part of sample 1 is located at the top of cylindrical roller 2.
As shown in figure 5, the lower surface of cavity plate 5 is in corresponding zigzag with the upper surface of blank holder 6 in sample fixed mechanism
Set；Jagged structure is gradually reduced from outside to the inside height near sample lifting body, can by this kind of setting
It is effectively increased resistance and sample in process of the test can be avoided to be broken from marginal portion again.The lower surface of cavity plate 5 is near sample top
The inner side for rising mechanism is presented fillet and sets, and can reduce the influence to sample in process of the test.
As shown in fig. 6, the surface of cylindrical roller 2 is circumferentially spaced to set multiple stripeds.Pass through striped in process of the test
The friction of the contact with sample 1 of the surface of cylindrical roller 2 can be increased, prevents sample 1 to be moved in process of the test.
As shown in fig. 7, the sample that experimental rig of the present invention is used is string configuration, sample axial direction opens up on two sides
Two recesses, the notch position correspondence on two sides of sample axial direction.The two ends of sample and the width at middle part are more than two ends and middle part
Between position width.In experiment, when sample side is broken, because power is lax, the other side of sample is no longer influenced by greatly
Pulling force, can keep firm necking down or just cracking critical condition.Additionally, fracture position is plane, it is easy to measuring strain data.
As shown in figure 1, in the prior art using single recessed sample, in process of the test is carried out if lubrication it is bad be difficult to reach therefrom be interrupted
The purpose split, is often broken simultaneously from two sides, and breach is very big, and fracture position is curved surface, the bad measurement of strain data.
By taking sheet metal as an example, use the detailed process that the carrying out of said determination device is tested for：
1) sheet metal, is cut, as shown in Figure 7；
2）, on sheet metal sample outer surface grid is printed, for follow-up strain measurement；
3）, the two ends of sheet metal sample are placed on pressure coil, pressure coil is moved then up and is closed with cavity plate, will
Sheet metal sample is fixedly clamped；The middle part of sheet metal sample, positioned at the top of cylindrical roller；
4）, start hydraulic pump drive the upward jacking of cylindrical roller, connect in the middle part of cylindrical roller and sheet metal sample
Touch, and gradually increase top lift, until the side of sheet metal sample is broken, then stop hydraulic pump；
5）, now sheet metal sample opposite side be in firm necking down or firm state of rupture, measure the dependent variable in this region
According to the left-half for making forming limit diagram.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, some improvement can also be made under the premise without departing from the principles of the invention, these improvement also should be regarded as of the invention
Protection domain.
Claims (3)
1. it is a kind of determine metal sheet forming limiting figure left-half test method, it is characterised in that the device of use includes
Two sample fixed mechanisms and sample lifting body, described two sample fixed mechanisms are arranged on the both sides of sample lifting body；
The sample lifting body includes cylindrical roller and lowering or hoisting gear, and cylindrical roller is erected at the top of lowering or hoisting gear, described
Lowering or hoisting gear drives cylindrical roller to move up and down, and the test method is comprised the following steps：
1) sample, is cut, the sample is elongated, two recesses, sample axial direction both sides is opened up on two sides of sample axial direction
Side notch position correspondence；
2）, specimen surface print grid；
3）, the two ends of sample are gripped by sample fixed mechanism respectively, the middle part of sample is located on cylindrical roller；
4）, stop after the side of the upward jacking cylindrical roller of lowering or hoisting gear to sample disconnects；
5）, sample opposite side be in necking down or firm state of rupture, measure this region strain data draw make forming limit diagram
Left-half.
2. it is according to claim 1 determine metal sheet forming limiting figure left-half test method, it is characterised in that：
The cylindrical roller surface is circumferentially arranged with several strip projected parts.
3. the test method for determining metal sheet forming limiting figure left-half according to claim 1 and 2, its feature exists
In：The sample fixed mechanism includes cavity plate and blank holder, and the blank holder is located at the lower section of cavity plate, the lower surface of the cavity plate
Upper surface with blank holder is serrated；Sawtooth height on the lower surface of the cavity plate and the upper surface of blank holder is by outer lateral
Inner side near sample lifting body gradually reduces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410846372.6A CN104655503B (en) | 2014-12-31 | 2014-12-31 | Determine the device and test method of metal sheet forming limiting figure left-half |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410846372.6A CN104655503B (en) | 2014-12-31 | 2014-12-31 | Determine the device and test method of metal sheet forming limiting figure left-half |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104655503A CN104655503A (en) | 2015-05-27 |
| CN104655503B true CN104655503B (en) | 2017-06-13 |
Family
ID=53246891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410846372.6A Expired - Fee Related CN104655503B (en) | 2014-12-31 | 2014-12-31 | Determine the device and test method of metal sheet forming limiting figure left-half |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104655503B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820206B (en) * | 2021-10-28 | 2022-06-21 | 吉林大学 | Test sample, test fixture and test method for measuring Bauschinger effect of plate |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940009403B1 (en) * | 1992-12-30 | 1994-10-13 | 포항종합제철주식회사 | Stamping appraisal device and method of a steel sheet |
| CN201548450U (en) * | 2009-10-20 | 2010-08-11 | 武汉钢铁(集团)公司 | Novel edge pressing mold for detecting formed limit curve |
| CN201780237U (en) * | 2010-07-21 | 2011-03-30 | 宝山钢铁股份有限公司 | Sheet-forming limit testing die |
| US8511178B2 (en) * | 2011-04-01 | 2013-08-20 | Ford Global Technologies, Llc | Screening test for stretch flanging a trimmed metal surface |
| CN102305745A (en) * | 2011-05-25 | 2012-01-04 | 山东大学 | Differential-interference-contrast (DIC)-technology-based sheet metal forming performance testing device |
| CN102539316B (en) * | 2012-02-27 | 2013-10-23 | 山东大学 | Method for measuring plastic-forming friction coefficient of magnesium alloy plate material |
| CN202533338U (en) * | 2012-03-30 | 2012-11-14 | 宝山钢铁股份有限公司 | High-temperature forming limit testing device |
| CN103267689A (en) * | 2013-05-07 | 2013-08-28 | 桂林电子科技大学 | Pipe hydrobulging forming limit diagram construction method and test apparatus |
| CN103424315B (en) * | 2013-08-05 | 2015-08-26 | 大连理工大学 | For the experimental provision that the laser assembly solder plate hot forming limit is measured |
| CN203908861U (en) * | 2014-06-05 | 2014-10-29 | 首钢总公司 | Improved device for forming limit bulging experiment terrace die |
| CN104155194B (en) * | 2014-07-22 | 2016-05-18 | 武汉钢铁(集团)公司 | The FLC method of testing changing based on strain rate |
-
2014
- 2014-12-31 CN CN201410846372.6A patent/CN104655503B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN104655503A (en) | 2015-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105203394B (en) | Determine the device of plate stress-strain diagram | |
| CN203299053U (en) | Tabular sample clamp for high-temperature tensile test machine | |
| CN203848815U (en) | Semi-automatic thickness measuring machine for batteries | |
| CN105458340B (en) | A kind of localization punch for being used to measure non-magnetic metal plate residual stress | |
| CN104655503B (en) | Determine the device and test method of metal sheet forming limiting figure left-half | |
| CN106152904A (en) | A kind of device for workpiece sensing | |
| CN204228505U (en) | A kind of New Rock mechanics machine | |
| CN102564844A (en) | Method for measuring compact tension specimen fracture parameters by using double extensometers | |
| CN203811156U (en) | Motor stator core detection mechanism | |
| CN104315956B (en) | Aero-engine vector spout load state height measuring device and measuring method | |
| CN104783839B (en) | A kind of psychiatric department instruments of inspection | |
| CN106411067A (en) | Stator bearing press-in device | |
| CN202770717U (en) | Strain control device for high-temperature tension test of foil strips | |
| CN208833876U (en) | A kind of high voltage resistant testing device of semiconductor chip | |
| CN208592564U (en) | A kind of press fitting pin shaft device | |
| CN106872271A (en) | A kind of protective metal shell flaring test device | |
| CN203918386U (en) | A kind of accurate press fitting device | |
| CN206990588U (en) | A kind of electronic slump testing device | |
| CN203443848U (en) | Automatic sample width alignment mechanism of full-automatic tensile testing machine | |
| CN103743625B (en) | Quality detection device of square tube | |
| CN205209888U (en) | Wafer intensity detection device | |
| CN205415978U (en) | Automatic stripper of rubble test piece is stabilized to cement | |
| CN205038106U (en) | Wire rope resistance to compression test system | |
| CN210893591U (en) | Radial rigidity test device for prestressed metal corrugated pipe | |
| CN205449024U (en) | Tablet thickness measurement device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170613 Termination date: 20201231 |