CN108279175A - A kind of experimental rig and method obtaining the intensity adjustable steel plate temperature-differential forming limit - Google Patents
A kind of experimental rig and method obtaining the intensity adjustable steel plate temperature-differential forming limit Download PDFInfo
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- CN108279175A CN108279175A CN201810204624.3A CN201810204624A CN108279175A CN 108279175 A CN108279175 A CN 108279175A CN 201810204624 A CN201810204624 A CN 201810204624A CN 108279175 A CN108279175 A CN 108279175A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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Abstract
The present invention provides a kind of experimental rig obtaining the intensity adjustable steel plate temperature-differential forming limit, including punch is made of punch body, insert and ceramic thermal barrier layer；Ceramic thermal barrier layer is set among punch body and is fixed together with punch body；Insert is fixed on ram bottom, and the spherical surface of transitions smooth is formed with punch body；Punch is internally provided with the deep hole for installing heating rod and thermocouple；The threaded hole for connecting connecting rod is equipped at the top of punch；High-frequency induction heating coil and infrared probe composition closed-loop control system are respectively arranged with around punch and matrix blank holder；Further include upper backup pad, lower supporting plate, sliding block, guide post, pillar, pedestal, master cylinder, flanging cylinder, light source, higher frequency camera and thermal infrared imager.The present invention makes hot test exemplar have different quenching rates in punch both sides by the temperature of control punch both sides, to simulate the temperature-differential forming process of intensity adjustable steel plate, and the temperature-differential forming limit of the strain field acquisition intensity adjustable steel plate acquired by higher frequency camera.
Description
Technical field
The present invention relates to the hot forming field of high-strength steel sheet more particularly to a kind of acquisition intensity adjustable steel plate temperature-differential forming poles
The experimental rig and method of limit.
Background technology
What the fast development of automobile industry greatly improved people goes out line efficiency, promotes social development, but simultaneously
Bring many safety problems and environmental problem.Light-weight design is realized on the basis of ensureing safety, can effectively reduce vapour
Vehicle fuel consumption and exhaust emissions are the inexorable trends of automobile future development.Optimize structure design of automobile, using new material and
Corresponding advanced manufacturing technology is to realize the main method of light-weight design.
Ultrahigh-strength steel plates hot forming techniques are an advanced manufacturing technology dedicated for form high strength steel plate, one
As process be that steel plate is heated to 900 DEG C or more, make its abundant austenitizing, then fast ram forming and pressurize quenching, with
Obtain the high strength component with uniform martensitic structure.Can obtain intensity with unimach hot forming techniques is more than
The part of 1500MPa, therefore can suitably reduce the thickness of component in the case where ensureing that part strength does not reduce, to realize
The purpose of automotive light weight technology.
For some safety members of automobile, such as B columns, inner plate of car door, both required component have enough intensity to prevent
Only vehicle structure is seriously destroyed, while certain positions of component being needed to have lower intensity and higher energy-absorbing special again
Property, to improve the whole crashworthiness of automobile.Traditional hot forming techniques can only obtain the single unimach of performance
Component cannot be satisfied the requirement that component different parts need different mechanical properties；It was being shaped by changing component different parts
Quenching rate in journey can obtain with diverse microcosmic microstructure and mechanical property intensity adjustable structural member, apply to energy in vehicle body
Enough crashworthiness for farthest improving automobile entirety.
For the formability evaluation of hot forming plate, application is most universal, most intuitive method be forming limit diagram (FLD, or
FLC).So-called forming limit diagram refers in forming process, and strength contracting takes place in material under different (approximation) linear strains path
When a curve being constituted under primary and secondary strain coordinate system of strain point.Existing correlation test device and method are mainly used for obtaining
The ausforming limit for taking high-strength steel sheet, as Chinese patent (application No. is 201410076406.8) discloses a kind of metallic plate
Material hot forming limit experimental provision and test method can prevent from testing by heating plate and punch simultaneously in seal box
Heat transmission occurs for plate and punch in the process, to reduce test error.However, the forming of practical intensity adjustable steel plate is a non-
Constant temperature process, temperature are consecutive variations；Meanwhile intensity adjustable steel plate different location has different quenching rates, be differential temperature at
Shape process, therefore apparatus above and method can not obtain the temperature-differential forming limit of intensity adjustable steel plate.Chinese patent (application No. is
201210192708.2) a kind of numerical Simulation Prediction method of the hot forming transient state forming limit of unimach is disclosed, it should
Prediction technique is after carrying out material at high temperature uniaxial tensile test and obtaining hot forming plate constitutive bchavior parameter, with M-K theories
The M-K models that the hot forming limit is predicted under limit are established, based on determining model to different hot forming transient state process conditions
Under forming limit carry out calculating prediction, but be a lack of specific test result and verified.
To sum up, presently, be directed to the temperature-differential forming process of intensity adjustable steel plate experimental rig and method there are no phases
Report is closed, there is an urgent need to a kind of special experimental rigs and method to realize the temperature-differential forming process of intensity adjustable steel plate, and test
Its forming limit assesses its forming property.
Invention content
According to many technical problems existing for existing forming limit test device and method set forth above, and provide a kind of
Obtain the experimental rig and method of the intensity adjustable steel plate temperature-differential forming limit.Experimental rig provided by the invention can simulate intensity adjustable
The forming process of steel plate obtains the intensity adjustable component of specific microstructure and mechanical property distribution；Meanwhile the experimental rig can be with
It obtains the strain field during steel formability in real time by integrated optical strain measuring system, establishes accurate intensity adjustable steel plate
Forming limit diagram.
The technological means that the present invention uses is as follows：
A kind of experimental rig and method obtaining the intensity adjustable steel plate temperature-differential forming limit, which is characterized in that including：
Punch is mainly made of two punch body, insert and ceramic thermal barrier layers with symmetrical structure；It is described ceramics every
Thermosphere is installed on the centre of two punch body symmetrical structures, the heat transfer for completely cutting off the punch both sides；It is described
Together with punch body and the ceramic thermal barrier layer are closely attached by bolt；The insert is bolted on the punching
Head bottom, the spherical surface of transitions smooth is formed with the punch body, while playing the role of protecting ceramic thermal barrier layer；The punch
Inside is additionally provided with the deep hole for installing heating rod and thermocouple；The punch top for connecting connecting rod is offered at the top of the punch
Portion's threaded hole, the punch are connected by the connecting rod with master cylinder；
Blank holder, the embedding outside for being set on the punch and in up and down arrangement, be divided into punch-pin blank holder and cavity plate flanging
It encloses, high-frequency induction heating coil and infrared probe, institute is respectively arranged with around the punch-pin blank holder and the cavity plate blank holder
It states infrared probe and forms closed-loop control system with the high-frequency induction heating coil, for quickly heating blank holder and keeping flanging
Circle is in specified test temperature；
Support construction, mainly by pedestal, fixed pillar on the base and the support master for fixing the punch
Body forms；The supportive body includes upper backup pad, guide post, sliding block and lower supporting plate；The cavity plate blank holder is solid by bolt
It is scheduled on the lower supporting plate, the punch-pin blank holder is bolted on the sliding block；The sliding block and flanging cylinder phase
Even, the punch-pin blank holder is driven to be moved up and down along the guide post；The guide post upper end passes through screw thread with the upper backup pad
Connection, the guide post lower end is threadedly secured on the lower supporting plate；The master cylinder and the flanging cylinder are solid by bolt
It is scheduled on the upper backup pad, the respectively described punch and the punch-pin blank holder provide power；The pillar upper end passes through spiral shell
Line is connect with the lower supporting plate, and the lower rod end is connected by screw thread with the pedestal；
It is additionally provided with thermal infrared imager in the middle part of the pedestal, for obtaining and being recorded in tests exemplar deformation process in real time
Thermo parameters method；The both sides of the thermal infrared imager are equipped with light source and higher frequency camera, for obtaining and recording tests exemplar in real time
Strain field distribution.
Further, the connecting rod is provided with asbestos pad with the punch junction, the heat for preventing the punch
It is transmitted to the master cylinder by the connecting rod.
Further, the inside of the upper backup pad and the lower supporting plate is equipped with cooling water channel, is used for anti-locking apparatus
It is whole to be deformed because temperature is excessively high.
Further, the middle part of the lower supporting plate is equipped with circular through hole, and the through-hole is as collecting temperature field and strain
The form of field.
Further, the side surface and inner wall that the punch-pin blank holder and the cavity plate blank holder are contacted with tests exemplar
Intersection is equipped with fillet.
Further, the punch-pin blank holder is provided with round bead, the bead with tests exemplar contact side
With the matching grooves on the cavity plate blank holder, for preventing tests exemplar from flowing；The bead and the punch-pin blank holder
Fillet is provided at interface surfaces；It is provided with fillet at the groove and the cavity plate blank holder interface surfaces.
The invention discloses a kind of method obtaining the intensity adjustable steel plate temperature-differential forming limit using above-mentioned experimental rig,
It is characterized in that including the following steps：
S1, exemplar is prepared, the chequered with black and white high temperature resistant speckle of tests exemplar surface spraying rivets at tests exemplar edge
Tests exemplar is positioned in heating furnace and is warming up to assigned temperature by thermocouple, and keeps the temperature a period of time；
S2, high temperature resistant lubricating grease is coated on punch, punch-pin blank holder downlink presses cavity plate blank holder, to reduce heating
Thermal loss in the process；
S3, high-frequency induction heating coil is opened, blank holder is heated to test temperature rapidly, blank holder temperature passes through infrared
Probe acquisition, and realize closed-loop control with the radio-frequency induction coil；Punch both sides heating rod is opened, or only opens side and adds
Hot pin makes punch both sides that there is different temperature, punch temperature to be acquired by the thermocouple of both sides by adjusting heating rod power
And realize closed-loop control；
S4, light source, higher frequency camera and thermal infrared imager are opened；
After S5, exemplar to be tested are heated to assigned temperature and keep the temperature, the punch-pin blank holder uplink, until examination can be accommodated
It tests until exemplar enters gap between the punch-pin blank holder and the cavity plate blank holder；It will be heated by mechanical arm
Tests exemplar is transferred out out of heating furnace rapidly, is placed on the designated position on the cavity plate blank holder；
S6, quickly tests exemplar is pressed on the cavity plate blank holder by molding, the punch-pin blank holder；
S7, drift speed be Discrete control, punch elder generation fast downlink, until will contact test exemplar when, speed adjustment
For the test speed set；Punch punch test exemplar, until strength contracting or rupture occurs in tests exemplar；Meanwhile by infrared heat
As instrument records the thermo parameters method of tests exemplar in real time, the strain field distribution of tests exemplar is recorded in real time by higher frequency camera；
S8, the strain value for extracting the critical fracture moment, the limiting strain of rent is obtained by interpolation method；
S9, the punch-pin blank holder and punch uplink, blank holder die sinking, take out the exemplar after experiment；
S10, step S1-S9 is repeated, carries out the forming limit examination under the conditions of differently strained path, temperature and strain rate etc.
It tests, establishes temperature-differential forming limit curve of intensity adjustable steel plate under the conditions of different tests.
The present invention has the following advantages：
1) punch both sides can be heated to different temperatures by experimental rig of the present invention, can be with after punch. contact exemplar
Make exemplar both sides that there is different quenching rates, to simulate the forming process of intensity adjustable steel plate；
2) blank holder temperature is heated to identical as exemplar temperature by experimental rig of the present invention, prevents exemplar by after flanging
Heat exchange occurs with blank holder, influences test accuracy；
3) experimental rig of the present invention is heated and is kept the temperature to blank holder using radio-frequency induction coil, the efficiency of heating surface
Height, uniformity of temperature profile, heat insulation effect are good；
4) experimental rig of the present invention is obtained and is recorded in real time the strain field in exemplar deformation process using higher frequency camera
The strain value at distribution and critical fracture moment, convenient, fast, accuracy is high；
5) forming limit test that experimental rig of the present invention can be carried out is not only limited to intensity adjustable steel plate, while
Common non-isothermal forming limit test can be carried out, it at this time only need to be by punch both sides temperature setting at same temperature；
6) experimental rig of the present invention can also be used to carry out the ausforming marginal test in certain temperature range, this
When only need punch, blank holder and exemplar being heated to same temperature.
The present invention can be widely popularized in the hot forming field of high-strength steel sheet based on the above reasons.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to do simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without having to pay creative labor, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is punch of the present invention, punch-pin blank holder, cavity plate flanging circle center longitudinal sectional drawing.
Fig. 2 is the front view of punch of the present invention.
Fig. 3 is the vertical view of punch of the present invention.
Fig. 4 is the left view of punch of the present invention.
Fig. 5 be Fig. 3 in A-A to sectional view.
Fig. 6 is punch assembling schematic diagram of the present invention.
Fig. 7 is the structural schematic diagram of experimental rig of the present invention.
Fig. 8 is the flow chart of test method of the present invention.
In figure：1, punch body；2, ceramic thermal barrier layer；3, punch-pin blank holder；4, cavity plate blank holder；5, insert；6, groove；
7, insert threaded hole；8, bead；9, symmetrical structure threaded hole；10, punch screw top hole；11, heating rod mounting hole；12、
Thermocouple mounting hole；13, high-frequency induction heating coil；14, asbestos pad；15, connecting rod；16, punch；17, sliding block；18, guide post；
19, upper backup pad；20, master cylinder；21, flanging cylinder；22, infrared probe；23, lower supporting plate；24, pillar；25, pedestal, 26, light
Source；27, higher frequency camera；28, thermal infrared imager.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in fig. 7, a kind of experimental rig and method obtaining the intensity adjustable steel plate temperature-differential forming limit, including：
Punch 16 (as Figure 1-Figure 5), mainly by two with the punch bodies 1 of symmetrical structure, insert 5 and ceramics every
Thermosphere 2 forms；The ceramic thermal barrier layer 5 is installed on the centre of two 1 symmetrical structures of the punch body, for completely cutting off the punching
The heat transfer of first 16 both sides；The punch body 1 and the ceramic thermal barrier layer 5 pass through 1 side of punch body by bolt
Symmetrical structure threaded hole 9 is to be closely attached together；The insert 5 is fixed on institute by bolt across insert threaded hole 7
16 bottom of punch is stated, the spherical surface of transitions smooth is formed with the punch body 1, while playing the role of protecting ceramic thermal barrier layer 2；
It is additionally provided with the heating rod mounting hole 11 for installing heating rod inside the punch 16 and the thermocouple for installing thermocouple is pacified
Fill hole 12；16 top of the punch offers the punch screw top hole 10 for connecting connecting rod 15, and the punch 16 passes through institute
Connecting rod 15 is stated with master cylinder 20 to be connected；The connecting rod 15 is provided with asbestos pad 14 with 16 junction of the punch, described for preventing
The heat of punch 16 is transmitted to the master cylinder 20 by the connecting rod 15.
Blank holder (as shown in Figure 6), the embedding outside for being set on the punch 16 and in up and down arrangement, be divided into punch-pin flanging
3 and cavity plate blank holder 4 are enclosed, high-frequency induction heating line is respectively arranged with around the punch-pin blank holder 3 and the cavity plate blank holder 4
Circle 13 and infrared probe 22, the infrared probe 22 form closed-loop control system with the high-frequency induction heating coil 13, are used for
It quickly heats blank holder and keeps blank holder in specified test temperature；
Support construction, mainly by pedestal 25, the pillar being fixed on the pedestal 25 24 and for fixing the punch 16
Supportive body composition；The supportive body includes upper backup pad 19, guide post 18, sliding block 17 and lower supporting plate 23；The cavity plate
Blank holder 4 is fixed on by 6 bolts on the lower supporting plate 23, and the punch-pin blank holder 3 is fixed on described by 6 bolts
On sliding block 17；The sliding block 17 is connected with flanging cylinder 21, and the punch-pin blank holder 3 is driven to be moved up and down along the guide post 18；
18 upper end of the guide post is connected through a screw thread with the upper backup pad 19,18 lower end of the guide post be threadedly secured to it is described under
In support plate 23；The inside of the upper backup pad 19 and the lower supporting plate 23 is equipped with cooling water channel, whole for anti-locking apparatus
Body is deformed because temperature is excessively high.
The master cylinder 20 and the flanging cylinder 21 are bolted on the upper backup pad 19, the respectively described punch
16 and the punch-pin blank holder 3 provide power；24 upper end of the pillar is connect by screw thread with the lower supporting plate 23, the branch
24 lower end of column is connected by screw thread with the pedestal 25；
The center of the pedestal 25 is additionally provided with thermal infrared imager 28, for obtaining and recording tests exemplar deformation in real time
Thermo parameters method in the process；The both sides of the thermal infrared imager 28 are equipped with light source 26 and higher frequency camera 27, for obtaining in real time
With the strain field distribution of record tests exemplar.
The middle part of the lower supporting plate 23 is equipped with circular through hole 29, and the through-hole 29 is as collecting temperature field and strain field
Form.
The side surface that the punch-pin blank holder 3 and the cavity plate blank holder 4 are contacted with tests exemplar and inner wall intersection
It is equipped with fillet.The punch-pin blank holder 3 is provided with round bead 8, the bead 8 and institute with tests exemplar contact side
The groove 6 stated on cavity plate blank holder 4 matches, for preventing tests exemplar from flowing；The bead 8 and the punch-pin blank holder
It is provided with fillet at 3 interface surfaces；It is provided with fillet at the groove 6 and 4 interface surfaces of cavity plate blank holder.
As shown in figure 8, the invention discloses a kind of above-mentioned experimental rigs of application to obtain the intensity adjustable steel plate temperature-differential forming limit
Method, include the following steps：
S1, exemplar is prepared, the chequered with black and white high temperature resistant speckle of tests exemplar surface spraying rivets at tests exemplar edge
Tests exemplar is positioned in heating furnace and is warming up to assigned temperature by thermocouple, and keeps the temperature a period of time；
S2, high temperature resistant lubricating grease is coated on punch, 3 downlink of punch-pin blank holder presses cavity plate blank holder 4, adds to reduce
Thermal loss in thermal process；
S3, high-frequency induction heating coil 13 is opened, blank holder is heated to test temperature rapidly, blank holder temperature passes through red
22 acquisition of outer probe, and realize closed-loop control with the radio-frequency induction coil 13；16 both sides heating rod of punch is opened, or is only opened
Side heating rod is opened, makes 16 both sides of punch that there is different temperature, 16 temperature of punch to pass through both sides by adjusting heating rod power
Thermocouple acquire and realize closed-loop control, actual temp is depending on the requirement of required forming intensity adjustable steel plate；
S4, light source 26, higher frequency camera 27 and thermal infrared imager 28 are opened；
After S5, exemplar to be tested are heated to assigned temperature and keep the temperature, 3 uplink of punch-pin blank holder, until can accommodate
Until tests exemplar enters the gap between the punch-pin blank holder 3 and the cavity plate blank holder 4；It will be heated by mechanical arm
Good tests exemplar is transferred out out of heating furnace rapidly, is placed on the designated position on the cavity plate blank holder 4；
S6, quickly tests exemplar is pressed on the cavity plate blank holder 4 by molding, the punch-pin blank holder 3；
S7,16 speed of punch are Discrete control, the first fast downlink of punch 16, until will contact test exemplar when, speed
It is adjusted to the test speed set；16 punch test exemplar of punch, until strength contracting or rupture occurs in tests exemplar；Meanwhile by
Thermal infrared imager 28 records the thermo parameters method of tests exemplar in real time, records the strain field of tests exemplar in real time by higher frequency camera 27
Distribution；
S8, the strain value for extracting the critical fracture moment, the limiting strain of rent is obtained by interpolation method,；
16 uplink of S9, the punch-pin blank holder 3 and punch, blank holder die sinking, takes out the exemplar after experiment；
S10, step S1-S9 is repeated, carries out the forming limit examination under the conditions of differently strained path, temperature and strain rate etc.
It tests, establishes temperature-differential forming limit curve of intensity adjustable steel plate under the conditions of different tests.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (7)
1. a kind of experimental rig obtaining the intensity adjustable steel plate temperature-differential forming limit, which is characterized in that including：
Punch (16) is mainly made of two punch body (1), insert (5) and ceramic thermal barrier layers (2) with symmetrical structure；
The ceramic thermal barrier layer (5) is installed on the centre of two punch body (1) symmetrical structures, for completely cutting off the punch (16)
The heat transfer of both sides；The punch body (1) and the ceramic thermal barrier layer (5) are closely attached together by bolt；Institute
It states insert (5) and is bolted on the punch (16) bottom, the spherical surface of transitions smooth is formed with the punch body (1)；
The deep hole for installing heating rod and thermocouple is additionally provided with inside the punch (16)；It offers and is used at the top of the punch (16)
The punch screw top hole (10) of connecting rod (15) is connected, the punch (16) is connected by the connecting rod (15) with master cylinder (20)；
Blank holder, the embedding outside for being set on the punch (16) and in up and down arrangement, be divided into punch-pin blank holder (3) and cavity plate pressure
It is respectively arranged with high-frequency induction heating coil around flange (4), the punch-pin blank holder (3) and the cavity plate blank holder (4)
(13) and infrared probe (22), the infrared probe (22) form closed-loop control system with the high-frequency induction heating coil (13)
System, for quickly heating blank holder and keeping blank holder in specified test temperature；
Support construction, mainly by pedestal (25), the pillar (24) being fixed on the pedestal (25) and for fixing the punch
(16) supportive body composition；The supportive body includes upper backup pad (19), guide post (18), sliding block (17) and lower supporting plate
(23)；The cavity plate blank holder (4) is bolted on the lower supporting plate (23), and the punch-pin blank holder (3) passes through
Bolt is fixed on the sliding block (17)；The sliding block (17) is connected with flanging cylinder (21), drives punch-pin blank holder (3) edge
The guide post (18) to move up and down；Guide post (18) upper end is connected through a screw thread with the upper backup pad (19), described to lead
Column (18) lower end is threadedly secured on the lower supporting plate (23)；The master cylinder (20) and the flanging cylinder (21) pass through spiral shell
Bolt is fixed on the upper backup pad (19), and the respectively described punch (16) and the punch-pin blank holder (3) provide power；It is described
Pillar (24) upper end is connect by screw thread with the lower supporting plate (23), and pillar (24) lower end passes through screw thread and the pedestal
(25) it is connected；
It is additionally provided with thermal infrared imager (28) in the middle part of the pedestal (25), for obtaining and recording tests exemplar deformation process in real time
In thermo parameters method；The both sides of the thermal infrared imager (28) are equipped with light source (26) and higher frequency camera (27), for obtaining in real time
Take and record the strain field distribution of tests exemplar.
2. the experimental rig and method according to claim 1 for obtaining the intensity adjustable steel plate temperature-differential forming limit, feature exist
In the connecting rod (15) is provided with asbestos pad (14), the heat for preventing the punch (16) with the punch (16) junction
Amount is transmitted to the master cylinder (20) by the connecting rod (15).
3. the experimental rig according to claim 1 for obtaining the intensity adjustable steel plate temperature-differential forming limit, which is characterized in that described
The inside of upper backup pad (19) and the lower supporting plate (23) is equipped with cooling water channel, whole because temperature is excessively high for anti-locking apparatus
And it is deformed.
4. the experimental rig according to claim 1 for obtaining the intensity adjustable steel plate temperature-differential forming limit, which is characterized in that described
The middle part of lower supporting plate (23) is equipped with circular through hole (29), form of the through-hole (29) as collecting temperature field and strain field.
5. the experimental rig according to claim 1 for obtaining the intensity adjustable steel plate temperature-differential forming limit, which is characterized in that described
The side surface that punch-pin blank holder (3) and the cavity plate blank holder (4) are contacted with tests exemplar is equipped with circle with inner wall intersection
Angle.
6. the experimental rig according to claim 1 for obtaining the intensity adjustable steel plate temperature-differential forming limit, which is characterized in that described
Punch-pin blank holder (3) is provided with round bead (8), the bead (8) and the cavity plate pressure with tests exemplar contact side
Groove (6) on flange (4) matches, for preventing tests exemplar from flowing；The bead (8) and the punch-pin blank holder
(3) it is provided with fillet at interface surfaces；It is provided with fillet at the groove (6) and cavity plate blank holder (4) interface surfaces.
7. a kind of experimental rig using described in claim 1-6 any one claims obtains intensity adjustable steel plate temperature-differential forming
The method of the limit, it is characterised in that include the following steps：
S1, exemplar is prepared, by the chequered with black and white high temperature resistant speckle of tests exemplar surface spraying, thermoelectricity is riveted at tests exemplar edge
It is even, tests exemplar is positioned in heating furnace and is warming up to assigned temperature, and keeps the temperature a period of time；
S2, high temperature resistant lubricating grease is coated on punch, punch-pin blank holder (3) downlink presses cavity plate blank holder (4), adds to reduce
Thermal loss in thermal process；
S3, high-frequency induction heating coil (13) is opened, blank holder is heated to test temperature rapidly, blank holder temperature passes through infrared
Probe (22) acquisition, and realize closed-loop control with the radio-frequency induction coil (13)；Punch (16) both sides heating rod is opened, or
Side heating rod is only opened, makes punch (16) both sides that there is different temperature, punch (16) temperature by adjusting heating rod power
It is acquired by the thermocouple of both sides and realizes closed-loop control；
S4, light source (26), higher frequency camera (27) and thermal infrared imager (28) are opened；
After S5, exemplar to be tested are heated to assigned temperature and keep the temperature, punch-pin blank holder (3) uplink, until examination can be accommodated
It tests until exemplar enters gap between the punch-pin blank holder (3) and the cavity plate blank holder (4)；It will be added by mechanical arm
The good tests exemplar of heat is transferred out out of heating furnace rapidly, is placed on the designated position on the cavity plate blank holder (4)；
S6, quickly tests exemplar is pressed on the cavity plate blank holder (4) by molding, the punch-pin blank holder (3)；
S7, punch (16) speed be Discrete control, punch (16) elder generation fast downlink, until will contact test exemplar when, speed
It is adjusted to the test speed set；Punch (16) punch test exemplar, until strength contracting or rupture occurs in tests exemplar；Meanwhile
The thermo parameters method for recording tests exemplar in real time by thermal infrared imager (28) records tests exemplar in real time by higher frequency camera (27)
Strain field distribution；
S8, the strain value for extracting the critical fracture moment, the limiting strain of rent is obtained by interpolation method；
S9, the punch-pin blank holder (3) and punch (16) uplink, blank holder die sinking, take out the exemplar after experiment；
S10, step S1-S9 is repeated, carries out the forming limit test under the conditions of differently strained path, temperature and strain rate etc., builds
Vertical temperature-differential forming limit curve of intensity adjustable steel plate under the conditions of different tests.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810204624.3A CN108279175B (en) | 2018-03-13 | 2018-03-13 | Test device and method for obtaining differential temperature forming limit of variable-strength steel plate |
Applications Claiming Priority (1)
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