CN104198271A - High-temperature sheet forming performance testing mould and method - Google Patents
High-temperature sheet forming performance testing mould and method Download PDFInfo
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- CN104198271A CN104198271A CN201410410727.7A CN201410410727A CN104198271A CN 104198271 A CN104198271 A CN 104198271A CN 201410410727 A CN201410410727 A CN 201410410727A CN 104198271 A CN104198271 A CN 104198271A
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Abstract
The invention relates to a high-temperature sheet forming performance testing mould and method, belonging to the field of sheet forming performance testing. The high-temperature sheet forming performance testing mould is characterized in that the upper end of a concave mould fixing seat is provided with an inclined plane ring, and the lower end of the concave mould fixing seat is provided with a ring-shaped clamping jaw; an inclined plane ring is arranged in the middle of the ring-shaped clamping jaw, and the top of the bottom of the ring-shaped clamping jaw has a circular arc angle; the concave mould fixing seat is in contact with a locating ring by the inclined plane ring to be located; the ring-shaped clamping jaw at the lower end of the concave mould fixing seat is in contact with a concave mould clamping ring by the inclined plane ring; a blank holder is an 'L'-shaped rotating part, an inclined plane ring is arranged at the outer side of the blank holder, and the bottom of the inner side of the blank holder has a circular arc angle. The blank holder is in contact with the concave mould fixing seat to be fixed by the inclined plane ring at the outer side of the blank holder and the circular arc angle of the top of the ring-shaped clamping jaw, so that the coaxiality of the blank holder and the concave mould fixing seat can be guaranteed; an inclined plane ring is arranged in the middle of a convex mould, and when the convex mould moves upwards, the coaxiality of the convex mould and the blank holder can be guaranteed under the action of the inclined plane ring of the convex mould and the circular arc angle of the bottom of the inner side of the blank holder; due to the location, the coaxiality of a concave mould, the blank holder and the convex mould can meet the test requirement.
Description
Technical field
Patent of the present invention relates to a kind of high temperature sheet metal formability test mould and test method, belongs to sheet metal formability field tests.
Background technology
Along with the continuous appearance of novel alloy material, as magnesium alloy, titanium alloy, ultrahigh-strength steel plates, the mechanical property of metal material is constantly strengthened, keeping improving constantly strength degree under the condition that weight is constant or lighter, metal is still occupied a tiny space at advanced Material Field under the impact of the macromolecular material in the face of with rapid changepl. never-ending changes and improvements; But, be accompanied by the raising of material yield intensity, it has also run into a difficult problem in engineering application, be under normal temperature, to be difficult to be shaped, the more complicated part that is particularly shaped, very harsh to the requirement of former and technique, sometimes required shape even cannot be shaped under prior art condition at all, therefore,, in order to address this problem, temperature forming technique is arisen at the historic moment; So-called temperature is shaped and is heated to uniform temperature by plate, the feature of utilizing the yield strength of plate under high temperature to decline reduces the difficulty of shaping given shape part, but under high temperature, due to the variation of material inside organization structure, its correlated performance is different from normal temperature, and therefore detecting high strength plate forming property is at high temperature the basis of carrying out elevated temperature forming process design.
The high temperature sheet metal formability test die of inventing is herein (visible Chinese patent " Tepid environment universal sheet shaping test machine " taking existing Tepid environment universal sheet shaping energy testing machine as carrier, patent No. CN 200820108648.0), test method under this testing machine hot environment is as in special body of heater by test mould, be evacuated to certain vacuum tightness in by stove after, heat, be heated to after the temperature of requirement, form performance test, as lug test, punching block bulging test, hydraulic bulge test, AEG-process, drawing experiments, conical cup test, hole expansion test etc., can obtain thus the relevant forming property parameter of selected plate under specified temp.
In forming property experiment, punch-die and blank holder right alignment require, the depth of parallelism has relatively high expectations, it has directly determined the accuracy of test findings; At normal temperatures, can pass through the location of guide pillar, guide pin bushing, and processing and the rigging error of control part ensure right alignment requirement, visible Chinese patent " a kind of plate performance test experimental apparatus ", patent No. CN 201310710466.6 indirectly; But under hot conditions, amplify because part expanded by heating can cause error, and because the expansivity of different parts is different with expansion direction, cannot use guide pillar, guide pin bushing to limit position; Therefore,, if will ensure the right alignment of punch-die and blank holder under hot conditions, must position by mould punch-die and blank holder self, even if expanded by heating, owing to only having a kind of error, even if error is amplified, impact also can be less, can ensure to test required right alignment requirement.
The present invention proposes a kind of high temperature sheet metal formability test mould that carries out lug experiment, after matched moulds, carry out the location of self by specific punch-die and blank holder structure, be fixedly clamped subsequently, thereby ensured to test required right alignment requirement.
Summary of the invention
The present invention proposes a kind of high temperature sheet metal formability test mould, by designed specific punch-die and blank holder structure, make mould complete location by mould self in early stage when centering, ensure the right alignment requirement that experiment is required; This invention has solved under hot conditions, and conventional test mould makes the punch-die and the blank holder right alignment that ensure by indirect addressing occur the excessive problem that causes test failure of error because material expands.
The described high temperature sheet metal formability test mould structure for lug experiment under high temperature comprises that structure comprises locating ring, die holder, holder pressing plate, die, die clamping ring, blank holder, blank holder back up pad, punch, coupling bolt and attachment screw; It is characterized in that: die holder upper end is that inclined plane ring, lower end are annular claw, annular claw middle part is that inclined plane ring, bottom apex are arc chord angle; Die clamping ring contacts by inclined plane ring with annular claw, and is fixed on die holder by coupling bolt; Blank holder is " L " shape convolution part, and its outside has inclined plane ring, inside bottom to have arc chord angle; Punch middle part has inclined plane ring; Be aided with correct mode of operation by said structure feature, can realize the location of mould self, with the required right alignment requirement of warranty test.
Technical scheme of the present invention is: die holder upper end contacts location with locating ring lower end by inclined plane ring, ensure the right alignment of die holder and locating ring, with the main body that reduces test mould rigging error in the horizontal direction, ensure that mould is stressed symmetrical as far as possible in the time of experiment; The annular claw of die holder lower end contacts by inclined plane ring with die clamping ring, and the right alignment of die and die holder has been provided under the pressure-acting providing at coupling bolt; The inclined plane ring in " L " shape Clothoid type blank holder outside contacts with the arc chord angle on annular claw top, when matched moulds, under the effect of horizontal side force, locates, and has ensured the right alignment of blank holder and die holder; By moving on punch, the inclined plane ring at punch middle part contacts location with the arc chord angle of blank holder inside bottom, has ensured the right alignment of punch and blank holder; By above-mentioned location, ensure that the right alignment of die, blank holder, punch reaches testing requirements.
Described locating ring and die holder when assembling contact portion be and the inclined plane ring of 30 ° of vertical direction angles that and the height of the inclined plane ring of locating ring is 30 ~ 40mm; Under the effect of holder pressing plate and coupling bolt, along with tightening of bolt, the power that holder pressing plate imposes on die holder is decomposed into the power of vertical direction promotion die holder to locating ring internal motion at inclined plane ring place, and horizontal direction promotion die holder makes itself and locating ring reach coaxial power, in fixation procedure, complete the location of locating ring and die holder, ensured both right alignmenies; Due to the determining positions of die holder the position of follow-up punch-die and blank holder, therefore the existence of locating ring defines the die main body error of disalignment in the horizontal direction, while having ensured experiment, mould is stressed symmetrical as far as possible about center line.
Between described die holder and die, location is what to be realized under the effect of die clamping ring by the annular claw that equally distributed calvus forms circlewise; The surface of contact of annular claw and die clamping ring is 30 ° of inclined plane rings, and annular claw just can hold die at the lower bore that do not stress and enter; In the time tightening with attachment screw, die clamping ring moves upward, and order about annular claw by inclined plane ring and shrink to center, and then by contact, die is moved to center, thus positioning female die, the right alignment of guarantee die and die holder; When ensureing to make to locate under the condition of some strength, the power that screw will apply can be not excessive, and annular claw thickness is 9 ~ 12mm; Meanwhile, adopting click-on mechanism, is also the die in order to be convenient for changing different size, saves material.
Realize by the upper outside side inclined plane ring of blank holder and annular claw nose-circle arc angle the location of described blank holder; Complete behind the location of die, pass through matched moulds, outside blank holder, inclined plane ring contacts with annular claw nose-circle arc angle, under the effect of power, blank holder is moved to die holder central axis direction, finally complete the location of blank holder, ensured the right alignment of blank holder and die holder, and then ensured the right alignment of die and blank holder; While beginning due to experiment, blank holder clamps under the effect of die and blank holder back up pad, therefore without being fixed with other devices; The inclined plane ring of blank holder and the angle of vertical direction are 10 ~ 15 °, and less pitch angle is conducive to increase the component of horizontal direction, are conducive to the location of blank holder.
The location of described punch is to realize by 45 ° of inclined plane rings at punch middle part and the arc chord angle of blank holder inside bottom; Complete behind location at blank holder, on punch, move until its middle part inclined plane ring contacts with blank holder, under the effect of blank holder inside bottom arc chord angle, punch moves to blank holder central axis direction, finally complete location, ensure the right alignment of die and blank holder, and then ensured the right alignment of itself and die; Behind punch location, be fixed with pressing plate and bolt in its lower end; Overall height 2 ~ the 3mm of die and blank holder when punch middle part inclined plane ring to the distance on punch top is greater than matched moulds, so can warranty test in the time that sheet metal deep drawing completes, inclined plane ring and blank holder still have a segment distance, can not bump; Why adopt inclined plane ring location, and do not take body diameter and die internal diameter to carry out axle location, hole, because the setting of spacing between the two not only will be considered sheet thickness, also will consider that under high temperature, the expansion of material causes diameter of axle increase, aperture to reduce, therefore excessive spacing cannot be used for the location of punch.
There is through hole at described die holder, locating ring center, and its aperture is greater than die endoporus 3 ~ 4mm; The one, for weight reduction is to reduce the load-bearing of coupling bolt, and do not affect the supporting role to die; The 2nd, during because of location punch, punch top can penetrate die, if die holder center is too small without through hole or through hole bore, can affect punch location.
A kind of high temperature sheet metal formability experiment mould proposed by the invention can solve normal experiment mould and at high temperature cause because material expands the problem that punch-die and blank holder cannot centering; Its self-align by between die main body, has got rid of the impact of the rigging error existing by mould bases indirect addressing, has ensured that the right alignment of punch-die and blank holder reaches testing requirements; The present invention has only designed corresponding test mould for AEG-process, but its mentality of designing can apply to other formability test moulds, as lug test, punching block bulging test, hydraulic bulge test, drawing experiments, conical cup test, hole expansion test etc.
Brief description of the drawings
Fig. 1 is the scheme of installation of test mould on formability test machine;
Fig. 2 is the structural representation of test mould;
Fig. 3 is the assembling schematic diagram of punch on punch push rod;
Fig. 4 is the three-dimensional cut-open view of mould structure;
Fig. 5 is die holder three-dimensional plot;
In accompanying drawing: 1-locating ring, 2-die holder upper end inclined plane ring, 3-die holder, 4-holder pressing plate, 5-die, 6-die clamping ring, 7-attachment screw, 8-blank holder, 9-blank holder back up pad, 10-the second fixed bar, 11-punch, 12-coupling bolt, 13-pressing plate, 14-testing machine upper plate, 15-the first fixed bar, 16-the 3rd fixed bar, 17-backing plate, plate in 18-testing machine, 19-blank holder push rod, 20-punch push rod, 21-blank holder oil cylinder, 22-punch oil cylinder, 23-tester base, 24-annular claw, 25-annular claw middle part inclined plane ring, inclined plane ring outside 26-blank holder, the most advanced and sophisticated arc chord angle of 27-annular claw, 28-blank holder inside bottom arc chord angle, 29-punch middle part inclined plane ring, 30-calvus.
Specific embodiments
Below in conjunction with accompanying drawing, a kind of high temperature sheet metal formability test mould of the present invention is described further.
As shown in Figure 1, this test mould is arranged on sheet metal formability testing machine, and the locating ring of mould the top is by the first fixed bar 15(3 root) be connected and be bolted with testing machine upper plate 14; The blank holder 8 of mould is placed in blank holder back up pad 9, and blank holder back up pad 9 is by the second fixed bar 10(3 root) support, the second fixed bar 10 is fixed on backing plate 13, and backing plate 13 is fixed on 3 blank holder push rods 19, and driven by blank holder oil cylinder 21 by it; The punch 11 of mould is fixed on punch push rod 20, and driven by punch oil cylinder 22 by it.
This high temperature sheet metal formability test mould as shown in Figure 2, its structure comprises locating ring 1, die holder 3, holder pressing plate 4, die 5, die clamping ring 6, blank holder 8, blank holder back up pad 9, punch 11, coupling bolt 12 and attachment screw 7 etc.; Concrete assembling mode is: die holder 3, below locating ring 1, contacts location by inclined plane ring 2, and clamps by holder pressing plate 4 and coupling bolt 12; Die 5 is positioned at the annular claw 24 of die holder 3 lower ends, and annular claw 24 contacts by inclined plane ring 25 with die clamping ring 6, and annular claw 24 positions clamping to die 5 under the effect of die clamping ring 6 and attachment screw 7; The blank holder 8 of die 5 belows is located by annular claw 24 nose-circle arc angles 27 on its outside inclined plane ring 26 and die holder 3, and be positioned in blank holder back up pad 9, can be freely unmovable when matched moulds, but in the time of matched moulds, be subject to the pressure of die 5 and blank holder back up pad 9 and fix; Punch 11 is positioned at die 5 and blank holder 8 is inner and coaxial with it, and during by matched moulds, the inclined plane ring 29 at punch 11 middle parts positions with the arc chord angle 28 of blank holder 8 inside bottom, and is fixed on die-pin 20 by chain connecting bolt 12 and pressing plate 13.
As shown in Figure 2, for weight reduction is to reduce the load-bearing of coupling bolt 12, and do not affect the supporting role to die 5, be at die holder 3, locating ring 1 boring central through hole, its aperture is greater than die endoporus 3 ~ 4mm; When ensureing to make to locate under the condition of some strength, the power that attachment screw 7 will apply can be not excessive, and in the time of the annular claw 24 of processing, thickness ensures at 9 ~ 12mm.
As shown in Figure 3, in order to be convenient for changing punch 11 and to form good fixing to it, the present invention adopts draw-in groove form, and punch 11 can pass pressing plate 13 by lower end from top according to correspondence direction, then after rotating to an angle, pressing plate 13 just can block punch 11; Pressing plate 13 is fixed on punch push rod 20 by coupling bolt 12, fix punch 11.
As shown in Figure 4, in order to make die holder 3 good location, the present invention adopts draw-in groove form to be fixed it; Die holder 3 can be by upper end through holder pressing plate 4 according to correspondence direction from below, after rotating to an angle again, holder pressing plate 4 just can block die holder 3, after coupling bolt 12 is tightened, under the condition that ensures right alignment, die holder 3 is fixed.
As shown in Figure 5, the annular claw 24 of die holder 3 lower ends is to be made up of equally distributed in the form of a ring calvus 30; Annular claw 24 middle parts are 30 ° of inclined plane rings 25, and bottom apex is arc chord angle 27.
Mold work mode is as follows:
(1) locate early stage: first put selected die 5 into die holder 3, tighten attachment screw 7, locate and fixing die 5 by die clamping ring 6; Again die holder 3 is put into locating ring 1, tighten coupling bolt 12, by holder pressing plate 4, it is fixed; Punch 11 is put on punch push rod 20, but first unfixing, by punch oil cylinder 22, punch push rod 20 is declined; Blank holder 8 is placed in blank holder back up pad 9, by estimating and the blank holder push rod 19 that rises, blank holder 8 can be entered in annular claw 24 substantially, then by blank holder oil cylinder 21 rising blank holder push rods 19, blank holder 8 is positioned under annular claw 24 drives; Finally tentatively be decided to be punch 11 by estimating, make it substantially can pass blank holder 8 central through holes, then the punch push rod 20 that rises, until punch inclined plane ring 2 contacts with blank holder 8 inside bottom arc chord angles and is stressed, after the punch 11 of location, tighten coupling bolt 12, be fixed by pressing plate 13; Finally, complete behind punch 11, die 5 and blank holder 8 location, decline punch push rod 20 and blank holder push rod 19, and ensure that punch top is lower than blank holder upper surface;
(2) plate is placed: plate is placed on blank holder 8, by range estimation, ensures that itself and blank holder are coaxial; Rising blank holder push rod 19 carries out matched moulds;
(3) experiment: clamping after plate, rising punch push rod 20 is tested;
According to aforesaid operations mode, can ensure the right alignment of punch-die, blank holder, plate, for Success in Experiment is laid a good foundation.
Claims (6)
1. a high temperature sheet metal formability test mould, for plate lug experiment at high temperature, its structure comprises locating ring, die holder, holder pressing plate, die, die clamping ring, blank holder, blank holder back up pad, punch, coupling bolt and attachment screw; Locating ring is connected to a fixed by the first fixed bar and testing machine upper plate; Below locating ring, die holder by holder pressing plate and coupling bolt is connected with locating ring and fix; Die is positioned at die holder lower end, is fixed on die holder by die clamping ring and attachment screw; Die below is blank holder, and blank holder is positioned in blank holder back up pad, not freely activity when matched moulds; Blank holder back up pad is connected with the second fixed bar, by backing plate and blank holder push rod below be connected with blank holder oil cylinder; Punch is coaxial with die and blank holder, and lower end is fixed on punch push rod, and by punch push rod below be connected with punch oil cylinder; It is characterized in that: die holder upper end is that inclined plane ring, lower end are annular claw, annular claw middle part is that inclined plane ring, bottom apex are arc chord angle, die holder contacts location with locating ring by inclined plane ring, ensure the right alignment of die holder and locating ring, thereby the main body that reduces test mould rigging error in the horizontal direction, has ensured that mould is stressed symmetrical as far as possible in the time of experiment; The annular claw of die holder lower end contacts by inclined plane ring with die clamping ring, and annular claw has ensured the right alignment of die and die holder under the effect of die clamping ring; Blank holder is " L " shape convolution part, its outside has inclined plane ring, inside bottom to have arc chord angle, blank holder contacts location by the inclined plane ring in blank holder outside with the arc chord angle on annular claw top with die holder, has ensured the right alignment of blank holder and die holder; Punch middle part has inclined plane ring, and by moving on punch, punch and blank holder have ensured right alignment under the effect of punch inclined plane ring and blank holder inside bottom arc chord angle; By above-mentioned location, ensure that the right alignment of die, blank holder, punch reaches testing requirements.
2. a kind of high temperature sheet metal formability test mould as claimed in claim 1, is characterized in that: the inclined plane ring of described die holder upper end, the inclined plane ring at annular claw middle part and the angle of vertical direction are 30 °; The inclined plane ring of blank holder and the angle of vertical direction are 10 ~ 15 °; The inclined plane ring at punch middle part and the angle of vertical direction are 45 °.
3. a kind of high temperature sheet metal formability test mould as claimed in claim 1, it is characterized in that: the annular claw for positioning female die and blank holder on described die holder is made up of equally distributed in the form of a ring calvus, its thickness is 9 ~ 12mm, while making to locate under the condition that ensures some strength, the power that attachment screw will apply can be not excessive.
4. a kind of high temperature sheet metal formability test mould as claimed in claim 1, is characterized in that: there is through hole at described die holder, locating ring center, and its aperture is greater than die endoporus 3 ~ 4mm; Not only, for weight reduction is to reduce the load-bearing of coupling bolt, also do not affect the supporting role to die.
5. a kind of high temperature sheet metal formability test mould as claimed in claim 1, it is characterized in that: the overall height 2 ~ 3mm of die and blank holder when described punch middle part inclined plane ring to the distance on punch top is greater than matched moulds, the locating ring of punch is not affected test convex mould on move.
6. the test method of a kind of high temperature sheet metal formability test mould as claimed in claim 1, according to aforesaid operations mode, can ensure the right alignment of punch-die, blank holder, plate, lay a good foundation for Success in Experiment, it is characterized in that comprising the steps:
(1) locate early stage: first put selected die into die holder, tighten attachment screw, locate and fix die by die clamping ring; Again die holder is put into locating ring, tighten coupling bolt, by holder pressing plate, it is fixed; Punch is put on punch push rod, but first unfixing, by punch oil cylinder, punch push rod is declined; Blank holder is placed in blank holder back up pad, by estimating and the blank holder push rod that rises, blank holder can be entered in annular claw, then by blank holder oil cylinder rising blank holder push rod, blank holder is positioned under annular claw drives; Finally tentatively be decided to be punch by estimating, make it substantially can pass blank holder central through hole, then the punch push rod that rises, until punch inclined plane ring contacts with blank holder inside bottom arc chord angle and is stressed, after the punch of location, tighten coupling bolt, be fixed by pressing plate; Finally, complete behind punch, die and blank holder location, decline punch push rod and blank holder push rod, and ensure that punch top is lower than blank holder upper surface;
(2) plate is placed: plate is placed on blank holder, by range estimation, ensures that itself and blank holder are coaxial; Rising blank holder push rod carries out matched moulds;
(3) experiment: clamping after plate, rising punch push rod is tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410410727.7A CN104198271B (en) | 2014-08-20 | High temperature sheet metal formability test mould and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410410727.7A CN104198271B (en) | 2014-08-20 | High temperature sheet metal formability test mould and test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104198271A true CN104198271A (en) | 2014-12-10 |
| CN104198271B CN104198271B (en) | 2017-01-04 |
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| CN110333145A (en) * | 2019-07-15 | 2019-10-15 | 苏州热工研究院有限公司 | Microspecimen High temperature bulging test device and test method |
| CN115541823A (en) * | 2022-09-29 | 2022-12-30 | 北京航空航天大学 | Ultra-thin plate formability testing machine |
| CN115541823B (en) * | 2022-09-29 | 2024-07-05 | 北京航空航天大学 | Ultrathin plate formability testing machine |
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| CN115541823A (en) * | 2022-09-29 | 2022-12-30 | 北京航空航天大学 | Ultra-thin plate formability testing machine |
| CN115541823B (en) * | 2022-09-29 | 2024-07-05 | 北京航空航天大学 | Ultrathin plate formability testing machine |
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