CN102353577B - Flexible die for stretching and bending shaping fracture - Google Patents
Flexible die for stretching and bending shaping fracture Download PDFInfo
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- CN102353577B CN102353577B CN 201110223812 CN201110223812A CN102353577B CN 102353577 B CN102353577 B CN 102353577B CN 201110223812 CN201110223812 CN 201110223812 CN 201110223812 A CN201110223812 A CN 201110223812A CN 102353577 B CN102353577 B CN 102353577B
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Abstract
The invention provides a flexible die for stretching and bending forming fracture. The die comprises a punch insert block, a punch insert block seat, an insert block seat fixing baffle, a lower plate, a guide block, a blank holder, a matrix, a draw bead, a displacement sensor fixed slot and a displacement sensor stay wire positioning pin. According to combination of two data acquisition apparatuses for punch insert block pressure and for matrix displacement, bearing state of a plate can be analyzed through pressure variation of the punch insert block, and a shaping depth of the plate can be analyzed through measuring of the matrix displacement, so as to comprehensively compare and analyze characteristics of different shaping fracture modes of advanced high strength steel. Characteristics of different shaping fracture modes can be compared conveniently and effectively to satisfy requirements of research on shaping shearing fracture characteristics of an advanced high strength steel automobile plate.
Description
Technical field
The present invention relates to the mould in a kind of plastic forming technology field, relate to particularly a kind of flexible stretch bending shaping fracture characteristic mould.
Background technology
AHSS has lower yield tensile ratio, Strain Distribution ability, and higher strain hardening characteristic preferably; Simultaneously, this class steel also has the fatigue lifetime of better collision characteristic and Geng Gao.Therefore, AHSS has broad application prospects in the lightweight of auto industry.Yet, experiment finds that in AHSS stretch wrap forming process, shear fracture easily occurs in close punch-die fillet position, the fracture of this fracture mode does not have obvious attenuate and constriction, obviously different from the necking rupture that medium carbon steel and Hi-Stren steel kind are observed, be the exclusive characteristics of AHSS.Unpredictable this kind fracture of shaping limit curve based on material constriction Unstability Theory is set up lacks at present effective means the shaping shear fracture limit is carried out accurate evaluation.Because the shear fracture of AHSS generally occurs under the stretch bending stress of minor radius fillet, and the ratio relation of its shaping fracture mode and mold radius and plate is close; Simultaneously, the stretch ratio that is subject to of AHSS plate also can affect its shaping fracture mode.Therefore, be necessary to invent a cover and have variable radius of corner, can realize the flexible forming fracture experiment platform with data collector of various stretch bending stresses, carry out the shaping fault analysis of AHSS, foundation can be predicted the criterion of shear fracture, reduces the generation of shear fracture.
find through the literature search to prior art, the people such as Ji Hoon Kim published thesis on periodical " International Journal of Plasticity " in 2011 " The shear fracture of dual-phase steel " (" shear fracture of dual phase steel "), this article utilizes the thermodynamics finite element model to carry out simulation analysis to the draw-bend experimental result of several other high strength dual phase steels of different intensity scale, this research is main considers that temperature factor is on the impact of forming results, but experimental facilities used not only volume is large, and too complicated, the equipment difference used with traditional process for stamping and forming is larger.B.S.Levy and C.J.Van Tyne adopt based on the shaping limit curve of stress the forming results of the two steel of several high strength are predicted, and with ASB(Angular stretch bend) test verifies the above results, but inserting of ASB test unit is highly larger, changes inconvenience; And the Forming depth (pertinent literature: B.S.Levy that is difficult to the Measurement accuracy sample, C.J.Van Tyne.Predicting breakage on a die radius with a straight bend axis during sheet forming.Journal of Materials Processing Technology, 2009,209:2038-2046.).Danielle Zeng, Z.Cedric Xia etc. are studied for the shear fracture mechanism of high strength dual phase steel, and by experiment with the contrast of simulation result, the characteristics of high strength dual phase steel shear fracture with respect to necking rupture have been analyzed, but its experimental facilities is larger, cause the size of experimental sample larger, economy and the convenience of experiment are not high, and the relatively poor (pertinent literature: Danielle Zeng of the symmetry of experimental facilities, Z.Cedric Xia, Hua-Chu Shih, Ming F.Shi.Development of Shear Fracture Criterion for Dual-Phase Steel Stamping.SAE2009-01-1172.).
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of stretch bending shaping fracture characteristic mould with displacement and pressure data harvester of flexibility is provided, can realize the different stretch case of bending of plate, can analyze distortion and the stressing conditions of plate under different stretch bending states by data collector, can satisfy the requirement of the advanced high-strength steel shear fracture rule of research, simultaneously the present invention has also that volume is little, centering strong and inserts and change the advantages such as convenient.
the present invention is achieved by the following technical solutions, the present invention includes punch insert, the punch insert seat, the fixing coaming plate of seat of inserting, lower shoe, guide block, blank holder, die, drawbead, the displacement transducer pickup groove, and displacement transducer bracing wire register pin, wherein, described punch insert removably is embedded on described punch insert seat, described punch insert seat is fixed in the described fixedly coaming plate of seat of inserting, described insert the seat fixedly coaming plate be arranged on described lower shoe, described punch insert is fixed in described lower shoe together with described punch insert seat, described lower shoe is arranged on support.described guide block is arranged on the both sides of described lower shoe, described blank holder is positioned at the described punch insert outside and is held on the upper surface of described punch insert seat, the drawbead groove is arranged on described blank holder, described drawbead is arranged on the lower surface of described die, the described die that is positioned at described punch insert top is arranged on the master cylinder part on support, described displacement transducer pickup groove and insert the seat fixedly coaming plate be arranged on described lower shoe, described displacement transducer bracing wire register pin is installed on described die, the radius of corner of described die is greater than the radius of corner of described punch insert.
Preferably, the radius of corner of described punch insert comprises any size in following size: 1mm, 2mm, 4mm, 6mm, 8mm, 10mm or 15mm.Described punch insert volume is little, is arranged on described punch insert seat.
Preferably, the both sides of described punch insert are provided with threaded hole.For the ease of installing, the both sides of described punch insert can also be designed with the threaded hole of M22, during installation, described punch insert is mentioned or be placed in described punch insert seat by the bolt that is mated.In the present invention, punch design is become the independent form of inserting, insert but not die entrance is designed to two, can strengthen symmetry and the centering of a whole set of mould, the impact of the factors such as minimizing alignment error on advanced high-strength steel shaping fracture result.
Preferably, described punch insert seat has three connected circular grooves in its bottom, be used for installing three LOAD CELLS, have rectangular recess at its top, be used for installing described punch insert, during work, the pressure that described punch insert seat bears is fully provided and is measured by three LOAD CELLS.Here the installation of sensor and Position Design are become to go deep into the form of grooves of described punch insert seat, are conducive to reduce on the one hand the height of a whole set of mould, so as can be easily mold exchange more; On the other hand, directly carry out contacting with a unnotched plane of inserting than sensor, this design form can reduce the slippage of inserting a relative sensor in punching course, and centering is strong, and system is more stable.In addition, in order to reduce insert seat and the fixedly friction force between coaming plate of seat of inserting, specially the surrounded surface of described punch insert seat is designed to the band shape that the degree of depth is 1mm herein, reduces described punch insert seat and the fixedly contact area of coaming plate of seat of inserting, thereby reduce friction force between the two.
Described insert seat fixedly coaming plate be enclosed in the outside of described punch insert seat, in order to horizontal jitter and the rotation that reduces described punch insert seat, guarantee that described punch insert seat only applies the pressure of vertical direction to LOAD CELLS.Described insert the seat fixedly coaming plate by its bottom threaded hole be fixed on lower shoe.Simultaneously, also have to derive the groove of LOAD CELLS wiring on coaming plate.
Preferably, be provided with data line on described lower shoe and derive groove, cylindrical hole and three connected circular grooves.Described lower shoe is arranged on support, in order to fix three LOAD CELLS, two guide blocks, displacement transducer pickup grooves and to insert fixedly coaming plate of seat.Wherein, LOAD CELLS is arranged in three connected circular grooves that the described lower shoe degree of depth is 40mm, and this design can further reduce the height of a whole set of mould, and reduces rocking of sensor, strengthens centering.In addition, the data line that also has LOAD CELLS on described lower shoe is derived groove, and four cylindrical holes, transmits with convenient four the cylinder axis of stretching cylinder pressure in the top and can move by easy on and off.
Described guide block is arranged on the two ends of described lower shoe, in order to guide the motion of described blank holder and die, makes accurately matched moulds of a whole set of mould.
Described blank holder is in the described seat fixing outside of coaming plate of inserting, and can move up and down along guide block under four cylinder axis that transmit the top and stretch cylinder pressure support.Also be designed with the drawbead groove on described blank holder.
Described die is arranged on the top of support, can move up and down under the effect of single action fluid press master cylinder during work.Be the impact of research radius of corner on advanced high-strength steel shaping fracture mode, in the invention of this cover, die profile radius needs all radiuses greater than punch insert, is designed to 16mm.Also be designed with dismountable drawbead on described die.
Preferably, described drawbead is embedded on described die, is the round muscle that can unload, and radius is 6mm, and the high 7.5mm of muscle has described drawbead groove on described blank holder, coordinates use, and its radius of corner is 3mm.Use when needing snap-in force larger.
Described displacement transducer pickup groove is arranged on described lower shoe, in order to the fixed displacement sensor.
Preferably, described displacement transducer bracing wire register pin is arranged on described die, in order to the fixing draw ring of stay-supported type displacement sensor.Described displacement transducer bracing wire register pin comprises stove bolt and the king-bolt that large footpath is different, wherein, described stove bolt matches with the threaded hole of described king-bolt rear end, described king-bolt matches with threaded hole on described die, the degree of depth by threaded engagement on the adjusting size bolt is the verticality of adjusted position displacement sensor bracing wire accurately, guarantees the accuracy of measuring.
When making due to mould, the processing through hole is more more convenient than the groove of processing certain depth, and therefore, convenient for die sinking, the blank holder in the present invention and punch insert seat are divided into two and three processing respectively, are fixed into one by screw thread at last.
It is little that the present invention has a volume, low cost of manufacture, symmetry and centering are strong, insert and change the advantages such as convenient, detachable drawbead design on mould not only can reach the locked purpose in plate two ends, can also be used for research pressure-pad-force size to the impact of advanced high-strength steel shaping failure mode after dismounting.
The present invention can realize the advanced high strength steel plate different stretch flexural loading state in being shaped by following dual mode: the one, adopt the punch insert of different radiuss of corner, and the 2nd, the stretch bending ratio that realizes that by apply different pressure-pad-forces under the condition without drawbead plate is different.
The present invention includes punch insert pressure and die displacement two sets of data harvesters, not only can change to analyze by punch insert pressure the stress of plate, can also analyze by measuring the die displacement Forming depth of plate, the characteristics of the differing formed fracture mode of comparative analysis AHSS in many aspects.
When the present invention uses, the plate sample is placed on mark on blank holder, presses the descending button of press master cylinder, allow simultaneously data acquisition software begin to gather the data of LOAD CELLS and displacement transducer; In punching course, die moves downward and contacts plate with the speed of 10mm/s, this moment, plate was fixed between die and blank holder by pressure-pad-force and drawbead, die continues to move downward afterwards, by fixed punch insert, plate is pressed into its die cavity, unclamp at once the button of press when hearing the sound of plate fracture, and stop the collecting work of data acquisition software.
Description of drawings
Fig. 1 is unitary mould structural representation of the present invention;
Fig. 2 is the cavity die structure schematic diagram;
Fig. 3 is displacement transducer bracing wire register pin;
Fig. 4 is the guide block structural representation;
Fig. 5 is the punch insert structural representation;
Fig. 6 is the blank holder structural representation;
Fig. 7 is punch insert holder structure schematic diagram;
Fig. 8 is fixedly coaming plate structural representation of punch insert seat;
Fig. 9 is the lower shoe structural representation;
Figure 10 is the drawbead structural representation;
Figure 11 is displacement transducer fixed slot configurations schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: following examples are implemented under take technical solution of the present invention as prerequisite; provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
in one embodiment of the invention, described flexible stretch bending shaping fracture characteristic mould comprises die 1, displacement transducer bracing wire register pin 2, guide block 3, punch insert 4, blank holder 5, punch insert seat 6, the fixing coaming plate 7 of seat of inserting, drawbead 8, lower shoe 9, displacement transducer pickup groove 10, wherein, described lower shoe 9 is bolted on support, described displacement transducer pickup groove 10, described guide block 3 and the coaming plate 7 of inserting fixedly all are threaded connection and are fixed on described lower shoe 9, described die 1 be threaded connection with support on master cylinder partly be connected, can move up and down under the drive of master cylinder during work.Described blank holder 5 is arranged on described punch insert 4 outsides, on described blank holder 5, the drawbead groove is arranged, described drawbead 8 is embedded in the lower surface of die 1, and described displacement transducer bracing wire register pin 2 is connected on described die 1 by coarse thread, and described die 1 is positioned at the top of described punch insert 4.Described punch insert seat 6 is supported by three LOAD CELLS that are fixed on described lower shoe 9, and described punch insert 4 is arranged in the rectangular recess of described punch insert seat 6.Be arranged in described on described lower shoe 9 insert seat fixedly coaming plate 7 is enclosed in described punch insert seat 6, when guaranteeing work, punch insert seat 6 without rotating or moving horizontally, improves the degree of accuracy of experiment.
In a preference of the present embodiment, described punch insert 4 removably is embedded on described punch insert seat 6, and described blank holder 5 is held on the upper surface of described punch insert seat 6, and the radius of corner of described die 1 is greater than the radius of corner of described punch insert 4.Further preferably, the radius of corner of described punch insert 4 comprises any size in following size: 1mm, 2mm, 4mm, 6mm, 8mm, 10mm or 15mm; The both sides of described punch insert 4 are provided with threaded hole; Described displacement transducer bracing wire register pin 2 comprises stove bolt and the king-bolt that large footpath is different, and wherein, described stove bolt matches with the threaded hole of described king-bolt rear end, and described king-bolt matches with threaded hole on described die 1; The surrounding of described punch insert seat 6 comprises the banded structure with degree of depth; Be provided with data line on described lower shoe 9 and derive groove, cylindrical hole and three connected circular grooves; The round muscle of described drawbead 8 for unloading; Described punch insert seat 6 has three connected circular grooves in its bottom, has rectangular recess at its top.
In a specific embodiment of the present invention: by changing described punch insert 4 sizes, analyze the Materials Fracture behavior in different stretch bending radius forming process:
During experimental implementation, first stretching cylinder by the top of press ejects described blank holder 5, rise until the upper surface of described blank holder 5 higher than the upper surface of described punch insert 4, plate is placed on described blank holder 5, guarantee that as far as possible each plate all is placed on same centre position, can improve the degree of accuracy of experiment.Plate place complete after, the master cylinder of operation press makes described die 1 with the downward uniform motion of certain speed, and plate is compressed after described blank holder 5 contact, and the described drawbead 8 that passes through both sides is locked with plate two ends.Described die 1 continues descending, by fixed described punch insert 4, plate is pressed into its die cavity, stops at once the motion of described die 1 when hearing the sound of plate fracture, and the shape in the time of can keeping like this plate fracture is in order to analyze experimental result.In experimentation, the data that displacement and LOAD CELLS collect can be delivered in the data acquisition software of computer, can analyze shaping and the stressed result of plate after experimental data is arranged accordingly.
If need to change described punch insert 4, can be with on two threaded holes that are bolted to described punch insert 4 both sides, described punch insert 4 is mentioned get final product straight up.Also can by long wooden stick as lever, can change more effortlessly described punch insert 4.Be bolted to new described punch insert 4 both sides with two, brush simultaneously the lubricating oil power of having reduced friction around described punch insert 4, again described punch insert 4 is vertically put into the groove of described punch insert seat 6, can be completed like this work of changing described punch insert 4.
In another embodiment of the present embodiment: analyze different technology conditions (changing under different pressure-pad-force conditions) analysis-by-synthesis pressure-pad-force effect to the impact of sheet metal stretching bending forming fracture.
If need to analyze different pressure-pad-forces to the impact of sheet forming fracture mode, under the described drawbead 8 on described die 1 can being dismantled, and by being set, different pressure-pad-forces gets final product.Described drawbead 8 is connected with described die 1 by the counterbore screw, therefore can install easily or dismantle.
From above-mentioned result of implementation, the flexible stretch bending shaping fracture characteristic mould that obtains can be realized the stretch bending stress of AHSS convenient and strength-savingly, and can effectively analyze by the data of displacement and pressure transducer distortion and the stress of plate, the feature of more differing formed fracture mode, can satisfy the requirement of research AHSS Automobile Plate shaping shear fracture feature easily and effectively.
Claims (8)
1. flexible stretch bending shaping fracture characteristic mould, it is characterized in that, comprise punch insert, the punch insert seat, the fixing coaming plate of seat of inserting, lower shoe, guide block, blank holder, die, drawbead, the displacement transducer pickup groove, and displacement transducer bracing wire register pin, wherein, described punch insert removably is embedded on described punch insert seat, described punch insert seat is fixed in the described fixedly coaming plate of seat of inserting, described insert the seat fixedly coaming plate be arranged on described lower shoe, described punch insert is fixed in described lower shoe together with described punch insert seat, described lower shoe is arranged on support, described guide block is arranged on the both sides of described lower shoe, described blank holder is positioned at the described punch insert outside and is held on the upper surface of described punch insert seat, the drawbead groove is arranged on described blank holder, described drawbead is arranged on the lower surface of described die, the described die that is positioned at described punch insert top is arranged on the master cylinder part on support, described displacement transducer pickup groove and insert the seat fixedly coaming plate be arranged on described lower shoe, described displacement transducer bracing wire register pin is installed on described die, the radius of corner of described die is greater than the radius of corner of described punch insert.
2. flexible stretch bending shaping fracture characteristic mould according to claim 1, is characterized in that, the radius of corner of described punch insert comprises any size in following size:
1mm；
2mm；
4mm；
6mm；
8mm；
10mm; Perhaps
15mm。
3. flexible stretch bending shaping fracture characteristic mould according to claim 1, is characterized in that, the both sides of described punch insert are provided with threaded hole.
4. flexible stretch bending shaping fracture characteristic mould according to claim 3, it is characterized in that, described displacement transducer bracing wire register pin comprises stove bolt and the king-bolt that large footpath is different, wherein, described stove bolt matches with the threaded hole of described king-bolt rear end, and described king-bolt matches with threaded hole on described die.
5. flexible stretch bending shaping fracture characteristic mould according to claim 1, is characterized in that, the surrounding of described punch insert seat comprises the banded structure with degree of depth.
6. flexible stretch bending shaping fracture characteristic mould according to claim 1, is characterized in that, is provided with data line on described lower shoe and derives groove, cylindrical hole and three connected circular grooves.
7. flexible stretch bending shaping fracture characteristic mould according to claim 1, is characterized in that, the round muscle of described drawbead for unloading.
8. flexible stretch bending shaping fracture characteristic mould according to claim 1, is characterized in that, described punch insert seat has three connected circular grooves in its bottom, has rectangular recess at its top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110223812 CN102353577B (en) | 2011-08-05 | 2011-08-05 | Flexible die for stretching and bending shaping fracture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110223812 CN102353577B (en) | 2011-08-05 | 2011-08-05 | Flexible die for stretching and bending shaping fracture |
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| Publication Number | Publication Date |
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| CN102353577A CN102353577A (en) | 2012-02-15 |
| CN102353577B true CN102353577B (en) | 2013-06-19 |
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| CN 201110223812 Active CN102353577B (en) | 2011-08-05 | 2011-08-05 | Flexible die for stretching and bending shaping fracture |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104070111B (en) * | 2013-03-29 | 2016-01-27 | 宝山钢铁股份有限公司 | A kind of method of testing high strength steel plate flange rebound characteristics |
| CN103728187B (en) * | 2013-12-13 | 2016-11-02 | 上海交通大学 | Flexible shear peel of mould |
| CN109465314B (en) * | 2018-11-01 | 2020-06-26 | 上海工程技术大学 | Sheet bending forming process analysis test platform and process parameter test method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000321188A (en) * | 1999-05-10 | 2000-11-24 | Hitachi Ltd | Testing device |
| CN201163260Y (en) * | 2007-08-24 | 2008-12-10 | 重庆工学院 | Experimental device for plate bending property |
| CN201607362U (en) * | 2010-01-14 | 2010-10-13 | 宝山钢铁股份有限公司 | Die for bending test of metal sheet |
| CN101923025A (en) * | 2010-01-18 | 2010-12-22 | 孙振忠 | Method for detecting punching performance of foamed aluminum-core sandwich plates |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0354250B1 (en) * | 1988-08-01 | 1993-06-23 | Carl Schenck Ag | Perforation test apparatus for material samples or components |
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2011
- 2011-08-05 CN CN 201110223812 patent/CN102353577B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000321188A (en) * | 1999-05-10 | 2000-11-24 | Hitachi Ltd | Testing device |
| CN201163260Y (en) * | 2007-08-24 | 2008-12-10 | 重庆工学院 | Experimental device for plate bending property |
| CN201607362U (en) * | 2010-01-14 | 2010-10-13 | 宝山钢铁股份有限公司 | Die for bending test of metal sheet |
| CN101923025A (en) * | 2010-01-18 | 2010-12-22 | 孙振忠 | Method for detecting punching performance of foamed aluminum-core sandwich plates |
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