CN108593539A - A kind of contact metal semi-solid thixotropic behavior measuring device and its measurement method - Google Patents
A kind of contact metal semi-solid thixotropic behavior measuring device and its measurement method Download PDFInfo
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- CN108593539A CN108593539A CN201810487105.2A CN201810487105A CN108593539A CN 108593539 A CN108593539 A CN 108593539A CN 201810487105 A CN201810487105 A CN 201810487105A CN 108593539 A CN108593539 A CN 108593539A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 99
- 239000002184 metal Substances 0.000 title claims abstract description 99
- 239000007787 solid Substances 0.000 title claims abstract description 41
- 230000009974 thixotropic effect Effects 0.000 title claims abstract description 33
- 238000000691 measurement method Methods 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 239000000523 sample Substances 0.000 claims abstract description 31
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 16
- 238000000113 differential scanning calorimetry Methods 0.000 claims description 12
- 238000001938 differential scanning calorimetry curve Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 4
- 239000011449 brick Substances 0.000 claims description 3
- 230000005674 electromagnetic induction Effects 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000002905 metal composite material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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Abstract
The invention discloses a kind of contact metal semi-solid thixotropic behavior measuring device and its measurement methods, described device includes shell and measurement probe, several heating elements are provided on the madial wall of shell, outer casing bottom is connect with pedestal, it measures probe to be installed on the upside of shell by holder, the lower end of holder is connected with electric pushrod；It includes needle body to measure probe, and the lower end of needle body is tapered, and the upper end of needle body is connect by transmitting spring with pressure sensor, and pressure sensor is connect with holder；The method includes metal stock to be positioned on pedestal, the output end that electric pushrod is controlled by terminal moves, and to change the height of holder, needle body is made to be located at metal stock upper end.The present invention directly measures the liquid fraction of semisolid metal blank in such a way that probe carries out contact type measurement, and accuracy is high, highly reliable, applied widely.
Description
Technical field
The present invention relates to metal liquid fraction fields of measurement, and in particular to a kind of contact metal semi-solid thixotropic behavior measurement
Device and its measurement method.
Background technology
Metal parts are mainly shaped by the conventional methods such as squeezing, forging at present.But produce complex-shaped or thin-walled knot
When the parts of structure, the above method fails complete fulfillment requirement, and a large amount of fine mechanical processings are also needed to after forming.Therefore, it makes
, production cost high, production cycle long the problems such as low at yield rate.Metal semi-solid thixotropic forming is a kind of near-net-shape mode,
Usually the semi-solid blank containing 10~50% liquid fractions is squeezed or forged, at this point, semi-solid-state metal both can be as liquid
Continuous modification equally occurs for state metal, can also have specific shape as solid metallic.Meanwhile appropriate level and shape
Liquid phase is distributed on solid phase ball boundary, can be used as lubricant, deformation drag can be effectively reduced in entire forming process,
Improve die life；Suitable liquid phase can also fill the scaled fine of part or complex-shaped part, reduce the two of part
Secondary processing, reduces production cost.
The technological process of metal semi-solid thixotropic forming includes：Original blank prepare, semi-solid isothermal remelting and touch
Become forming.In semi-solid isothermal remelting, the liquid fraction in semi-solid blank is to influence thixotropic key parameter.Work as liquid
One after another is excessively high, and blank is difficult to shift carrying, is easy to happen avalanche type and caves in；And liquid fraction is too low, then fail embody semisolid at
The advantage of shape.Therefore, before forming, it would be desirable to real-time monitoring be carried out to the solid rate in semi-solid blank, it is best to intend selection
Solid rate is formed.Traditional semi-solid-state metal thixotropy measurement method directly measures the temperature of semi-solid blank using thermocouple
Or temperature field, and then achieve the purpose that control semi-solid-state metal solid rate.Thermocouple direct temperature measurement method disadvantage need to be every
It is punched on a metal stock, picks and places thermocouple, troublesome in poeration, low production efficiency；And the error measured is larger, for certain gold
Belong to, temperature difference ± 1 DEG C, then liquid fraction difference 10% or so.
Now temporary non-contact type metal semi-solid thixotropy measurement method and measuring device；It is existing a kind of based on infrared survey
The aluminum alloy semisolid remelting method for heating and controlling and device of temperature, it is non-to remelting heating semi-solid-state aluminium alloy using infrared radiation thermometer
Contact temperature-measuring shows temperature variation curve by software program, and the mesh of control blank liquid fraction is reached using phase change characteristics
, but this method is Non-contact control method, and infrared temperature-test technology obtains table according to object heat radiation emissive porwer
Face temperature, and be difficult to accurately obtain radiation intensity during sensing heating, therefore Preform surface temperature cannot be accurately obtained, finally
The liquid fraction error measured is big, influences final thixotropic forming.
Invention content
The present invention is directed to the above-mentioned deficiency of the prior art, provides a kind of straight in such a way that probe carries out contact type measurement
Connect the contact metal semi-solid thixotropic behavior measuring device and its measurement method of the liquid fraction for measuring semisolid metal blank.
In order to solve the above technical problems, present invention employs following technical proposals：
The present invention provides a kind of contact metal semi-solid thixotropic behavior measuring devices comprising shell and measurement are visited
Needle is provided with several heating elements on the madial wall of shell, and outer casing bottom is connect with pedestal, measures probe and is installed on by holder
On the upside of shell, the lower end of holder is connected with electric pushrod；Measure probe include needle body, the lower end of needle body is tapered, needle body it is upper
End is connect by transmitting spring with pressure sensor, and pressure sensor is connect with holder；
Heating element has been sequentially connected in series heating controller and terminal, pressure sensor and electric pushrod respectively with meter
Calculation machine terminal is connected.
In above-mentioned technical proposal, it is preferred that measure probe and include package pressure sensor, transmit on the outside of spring and needle body
Sleeve.
In above-mentioned technical proposal, it is preferred that the material of sleeve is ceramic-metal composite.
In above-mentioned technical proposal, it is preferred that pedestal is refractory brick.
In above-mentioned technical proposal, it is preferred that heating element is resistance wire or electromagnetic induction coil.
The present invention also provides a kind of contact gold using above-mentioned contact metal semi-solid thixotropic behavior measuring device
Belong to Semi-Solid Thixoforming characteristic measurement method comprising following steps：
S1, metal stock being positioned on pedestal, the output end that electric pushrod is controlled by terminal moves, to
The height for changing holder, makes needle body be located at metal stock upper end；
S2, heating controller is adjusted, metal stock is heated, metal stock is made to be in semisolid, keep heating unit
The temperature of part, and the temperature by terminal record at this time；
S3, by terminal control electric pushrod, make needle body with constant loading speed metal stock surface into
Row punctures；
S4, the pressure that needle body is subject to is recorded by pressure sensor, and be transferred in terminal；
S5, by the data comparison in the pressure and database that are recorded, obtain the liquid fraction of semisolid metal blank at this time.
Further, the method for building up of database includes the following steps：
S1, the DSC curve that metal stock is obtained by differential scanning calorimetry calculate its liquid fraction pass corresponding with temperature
System；
S2, in the heating process of metal stock, be heated to set temperature and keep stable, then by measure probe apply
Add the puncture of constant rate of speed, and record maximum stress, is denoted as thixotroping intensity；
S3, the temperature for increasing heating element extend the holding same temperature time, make to test and record thixotroping intensity again；
S4, step S2, S3 is repeated, and according to the variation relation of temperature and data, establishes temperature, thixotroping intensity, liquid fraction
Relational database.
Further, the DSC curve that metal stock is obtained by differential scanning calorimetry calculates its liquid fraction and temperature
The method of correspondence, includes the following steps：
S1, the DSC curve that metal stock is obtained by differential scanning calorimetry, read the solidus and liquidus curve temperature of material
Degree；
S2, f is takenlFor liquid fraction, TS、TLRespectively solidus and liquidus temperature, then according to formulaCalculate its liquid fraction flWith the correspondence of temperature T.
Further, control heating controller heats metal stock, and metal stock is made to be in semisolid, judges
The method that metal stock is in semisolid includes the following steps：
S1, the DSC curve that metal stock is obtained according to differential scanning calorimetry, read the solidus and liquidus curve temperature of material
Degree；
S2, control heating controller heat metal stock, and material is made to be heated to solidus temperature and liquidus curve temperature
Between degree.
The main advantageous effect of above-mentioned contact metal semi-solid thixotropic behavior measuring device provided by the invention is：
Metal semi-solid thixotropic behavior measuring device provided by the invention measures probe to metal to be detected by setting
The liquid fraction of blank carries out contact type measurement can more accurately obtain base relative to existing non-contact measurement mode
Surface temperature is expected, to more accurately measure the liquid fraction of metal stock, to ensure thixotropic forming effect.
By the way that pedestal is arranged, and heating element is set on housing interior side-wall, can ensure the heating to metal stock
Processing can adjust heated condition, dynamically measure touching for metal semisolid blank as needed by the way that heating controller is arranged
Become characteristic, and then realizes that Semi-Solid Thixoforming is molding and accurately control and forming operation.It is set as needle body, bullet by the way that probe will be measured
The structure that spring is connected with pressure sensor, the accuracy of proof stress monitoring, while damage pressure sensor is prevented, raising is set
Standby service life.
Measurement probe is wrapped up by the way that sleeve is arranged, can prevent from measuring probe interior structure, if pressure sensor is by high temperature shadow
It rings and damages, improve service life；It is connect with holder by the way that probe will be measured, can realize the automatic control to measuring probe movement
System, improves the reliability of measurement.
The main advantageous effect of above-mentioned contact metal semi-solid thixotropic behavior measurement method provided by the invention is：
Support motion is controlled by computer, contact type measurement is carried out to metal stock using probe is measured, can be surveyed in real time
Semi-solid-state metal solid-liquid one after another is measured, automation mechanized operation reduces the manpower consumption of materials, reduces production cost；It is passed by the way that heating is arranged
Sensor controls its solid-liquid one after another by heating schedule, realizes " reduce is mended " effect more, can accurately obtain best thixotropic behavior,
Improve production efficiency；Have a wide range of application, and can constantly update, meets big data and intelligence manufacture requirement.
By establishing database, record temperature, thixotroping intensity, liquid fraction can be suitable for different materials, different temperatures item
Metal stock under part, and by contact measurement method, measurement accuracy and precision can be greatly improved.
Description of the drawings
Fig. 1 is the structural schematic diagram of contact metal semi-solid thixotropic behavior measuring device.
Wherein, 1, shell, 11, heating element, 12, pedestal, 2, measure probe, 21, needle body, 22, transmit spring, 23, pressure
Force snesor, 24, holder, 241, electric pushrod, 25, sleeve, 3, heating controller, 4, terminal, 5, metal stock.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings：
As shown in Figure 1, its front view for contact metal semi-solid thixotropic behavior measuring device and its measurement method.
Contact metal semi-solid thixotropic behavior measuring device provided by the invention, including shell 1 and measurement probe 2, outside
Several heating elements 11 are provided on the madial wall of shell 1, heating element 11 is resistance wire or electromagnetic induction coil, heating element 11
Madial wall around shell 1 is uniformly arranged；1 bottom of shell is connect with pedestal 12, and pedestal 12 is refractory brick, by the way that pedestal 12 is arranged,
And heating element 11 is set on 1 madial wall of shell, it can ensure the heat treatment to metal stock 5.
Probe 2 is measured to include package pressure sensor 23, transmit spring 22 and the sleeve 25 in 21 outside of needle body, sleeve 25
Ceramic-metal composite can be selected in material.Probe 2 is measured by setting, the liquid fraction of metal stock 5 to be detected is carried out
Contact type measurement can more accurately obtain 5 surface temperature of metal stock relative to existing non-contact measurement mode,
To more accurately measure the liquid fraction of metal stock 5, to ensure thixotropic forming effect.
It measures probe 2 and 1 upside of shell is installed on by holder 24 so that it measures probe 2 and is aligned with 12 center of pedestal, holder
24 lower ends are connected with electric pushrod 241；It includes needle body 21 to measure probe 2, and the lower end of needle body 21 is tapered, and the upper end of needle body 21 is logical
It crosses transmission spring 22 to connect with pressure sensor 23, pressure sensor 23 is connect with holder 24.
It is connect with holder 24 by the way that probe 2 will be measured, can realize and be automatically controlled to measuring 2 movement of probe, improve and survey
The reliability of amount.
Heating element 11 has been sequentially connected in series heating controller 3 and terminal 4, pressure sensor 23 and electric pushrod
241 connect with terminal 4 respectively.By the way that heating controller 3 is arranged, heated condition can be adjusted as needed, dynamically
The thixotropic behavior of metal semisolid blank is measured, and then realizes that Semi-Solid Thixoforming is molding and accurately controls and forming operation.
Here is to carry out metal semi-solid thixotropic behavior using above-mentioned contact metal semi-solid thixotropic behavior measuring device
The method of measurement comprising following steps：
S1, metal stock 5 is positioned on pedestal 12, the output end that electric pushrod 241 is controlled by terminal 4 moves
It is dynamic, to change the height of holder 24, needle body 21 is made to be located at 5 upper end of metal stock.
S2, heating controller 3 is adjusted, metal stock 5 is heated, metal stock 5 is made to be in semisolid, keep heating
The temperature of element 11, and the temperature by the record of terminal 4 at this time.
Further, control heating controller 3 heats metal stock 5, and metal stock 5 is made to be in semisolid,
Judge that the method that metal stock 5 is in semisolid includes the following steps：
S2-1, the DSC curve that metal stock 5 is obtained according to differential scanning calorimetry, read the solidus and liquid phase of material
Line temperature；
S2-2, control heating controller 3 heat metal stock 5, and material is made to be heated to solidus temperature and liquid phase
Between line temperature.
S3, electric pushrod 241 is controlled by terminal 4, makes needle body 21 with constant loading speed in metal stock 5
Surface is punctured.
S4, the pressure that needle body 21 is subject to is recorded by pressure sensor 23, and be transferred in terminal 4.
S5, by the data comparison in the pressure and database that are recorded, obtain the liquid phase of semisolid metal blank 5 at this time
Rate.
Further, the method for building up of the database includes the following steps：
S5-1, the DSC curve that metal stock 5 is obtained by differential scanning calorimetry, calculate its liquid fraction and pair of temperature
It should be related to.
Further, the DSC curve that metal stock 5 is obtained by differential scanning calorimetry, calculates its liquid fraction and temperature
Correspondence method, include the following steps：
S5-1-1, the DSC curve that metal stock 5 is obtained by differential scanning calorimetry, read the solidus and liquid of material
Liquidus temperature；
S5-1-2, f is takenlFor liquid fraction, TS、TLRespectively solidus and liquidus temperature, then according to formulaCalculate its liquid fraction flWith the correspondence of temperature T.
S5-2, in the heating process of metal stock 5, be heated to set temperature and keep stable, then pass through measure visit
Needle 2 applies the puncture of constant rate of speed, and records maximum stress, is denoted as thixotroping intensity.
S5-3, the temperature for increasing heating element 11 extend the holding same temperature time, make to test again and record thixotroping
Intensity.
S5-4, repeat step S5-2, S5-3, and according to the variation relation of temperature and data, establish temperature, thixotroping intensity,
The relational database of liquid fraction.
By establishing database, record temperature, thixotroping intensity, liquid fraction can be suitable for different materials, different temperatures item
Metal stock 5 under part, and by contact measurement method, measurement accuracy and precision can be greatly improved.
In the blank processing in laboratory, it is equally applicable to the present apparatus, each item number is obtained by preceding method measurement
According to rear, according to the required best solid rate of the thixotropic forming set in computer 4 in advance, it is determined whether continue to heat, lead to
The computer heating control program in computer 4 is crossed, and control signal is sent out to heating controller 3.
Holder 24 is controlled by computer 4 to move, and contact type measurement is carried out to metal stock 5 using probe 2 is measured, it can be real
When measure semi-solid-state metal solid-liquid one after another, automation mechanized operation, reduce the manpower consumption of materials, reduce production cost；Pass through setting
Heating sensor 3 controls the solid-liquid one after another of metal stock 5, realizes " reduce is mended " effect more, can accurately obtain best thixotroping
Characteristic improves production efficiency；Have a wide range of application, and can constantly update.
The specific implementation mode of the present invention is described above, in order to facilitate understanding by those skilled in the art this hair
It is bright, it should be apparent that the present invention is not limited to the ranges of specific implementation mode, for those skilled in the art,
As long as various change is in the spirit and scope of the present invention that the attached claims limit and determine, these variations are aobvious and easy
See, all are using the innovation and creation of present inventive concept in the row of protection.
Claims (9)
1. a kind of contact metal semi-solid thixotropic behavior measuring device, which is characterized in that including shell (1) and measure probe
(2), several heating elements (11) are provided on the madial wall of shell (1), shell (1) bottom is connect with pedestal (12), the survey
Amount probe (2) is installed on by holder (24) on the upside of shell (1), and the lower end of holder (24) is connected with electric pushrod (241)；It measures
Probe (2) includes needle body (21), and the lower end of needle body (21) is tapered, and the upper end of needle body (21) is by transmitting spring (22) and pressure
Sensor (23) connects, and pressure sensor (23) is connect with holder (24)；
The heating element (11) connect with heating controller (3) and terminal (4) successively, the pressure sensor (23)
It connects respectively with terminal (4) with electric pushrod (241).
2. contact metal semi-solid thixotropic behavior measuring device according to claim 1, which is characterized in that the measurement
Probe (2) includes the sleeve (25) for wrapping up pressure sensor (23), transmitting spring (22) and needle body (21).
3. contact metal semi-solid thixotropic behavior measuring device according to claim 2, which is characterized in that the sleeve
(25) material is ceramic-metal composite.
4. contact metal semi-solid thixotropic behavior measuring device according to claim 1, which is characterized in that the pedestal
(12) it is refractory brick.
5. contact metal semi-solid thixotropic behavior measuring device according to claim 1, which is characterized in that the heating
Element (11) is resistance wire or electromagnetic induction coil.
6. a kind of measurement side using any contact metal semi-solid thixotropic behavior measuring device of claim 1 to 5
Method, which is characterized in that include the following steps：
S1, metal stock (5) is positioned on pedestal (12), controlling electric pushrod (241) by terminal (4) adjusts branch
The height of frame (24), until needle body (21) is located at metal stock (5) upper end；
S2, control heating controller (3) heat metal stock (5), and metal stock (5) is made to be in semisolid, keep adding
The temperature of thermal element (11), and the temperature by terminal (4) record at this time；
S3, again control electric pushrod (241) drive holder (24) mobile, and make needle body (21) with constant loading speed in gold
Belong to blank (5) surface to be punctured；
S4, the pressure being subject to using pressure sensor (23) record needle body (21), and it is transferred to terminal (4)；
Data in pressure and database that S5, comparison record, obtain the liquid fraction of semisolid metal blank (5) at this time.
7. contact metal semi-solid thixotropic behavior measurement method according to claim 6, which is characterized in that the data
The method for building up in library includes the following steps：
S1, the DSC curve that metal stock (5) is obtained by differential scanning calorimetry calculate its liquid fraction pass corresponding with temperature
System；
S2, in metal stock (5) heating process, be heated to set temperature and keep stable, then by measure probe (2) apply
Record maximum stress is labeled as thixotroping intensity by the puncture for adding constant rate of speed；
S3, the temperature for increasing heating element (11) extend the holding same temperature time, make to test and record thixotroping intensity again；
S4, step S2, S3 is repeated, and according to the variation relation of temperature and data, establishes the pass of temperature, thixotroping intensity, liquid fraction
It is database.
8. contact metal semi-solid thixotropic behavior measurement method according to claim 6, which is characterized in that described to pass through
Differential scanning calorimetry obtains the DSC curve of metal stock (5), and the method for calculating its liquid fraction and the correspondence of temperature includes
Following steps：
S1, the DSC curve that metal stock (5) is obtained by differential scanning calorimetry, read the solidus and liquidus curve temperature of material
Degree；
S2, according to solidus and liquidus temperature, calculate liquid fraction：
Wherein, flFor liquid fraction, TS、TLRespectively solidus and liquidus temperature.
9. contact metal semi-solid thixotropic behavior measurement method according to claim 8, which is characterized in that the control
Heating controller (3) heats metal stock (5), and metal stock (5) is made to be in semisolid, judges metal stock (5)
Method in semisolid includes the following steps：
S1, the DSC curve that metal stock (5) is obtained according to differential scanning calorimetry, read the solidus and liquidus curve temperature of material
Degree；
S2, control heating controller (3) heat metal stock (5), and material is made to be heated to solidus temperature and liquidus curve
Between temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458368A (en) * | 2020-05-18 | 2020-07-28 | 兰州理工大学 | System and method for measuring softening behavior of amorphous alloy in supercooled liquid region |
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