CN106918640A - The ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding - Google Patents
The ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding Download PDFInfo
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- CN106918640A CN106918640A CN201710034472.2A CN201710034472A CN106918640A CN 106918640 A CN106918640 A CN 106918640A CN 201710034472 A CN201710034472 A CN 201710034472A CN 106918640 A CN106918640 A CN 106918640A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/032—Analysing fluids by measuring attenuation of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/015—Attenuation, scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/022—Liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02818—Density, viscosity
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- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding, the injector fed including mould bases, the core rod being fixed in mould bases and to core rod, it is characterized in that, the core side wall is provided with the detection unit that two groups or more is used to detect material in core rod die cavity, and every group of detection unit includes detection temperature signal, the sensor and ultrasonic probe of pressure signal；The die cavity is narrow slit structure.The corresponding temperature that the present invention is obtained by using the present apparatus in test point position, pressure, ultrasonic signal, and add the shear rate being calculated according to injector basal rate, experiment parameter of the Synchronization Analysis polymer melt under non-isothermal and high shear field, the evolved behavior of polymer melt under these Parameters variations is studied, realizes that the Quantitative in situ of polymer injection moulding process is characterized, while also for the on-line checking of polymer injection provides a kind of new thinking.
Description
Technical field
The invention belongs to material and fluid test technical field, and in particular to a kind of non-isothermal high shear polymer is injected into
The ultrasonic in situ characterization apparatus of shape.
Background technology
Polymer injection moulding process is a dynamic changing process for complexity, and closing is injected into after polymer melting
In mold cavity through cool and solidify postforming, whole process polymer melt along with temperature and pressure acute variation.Online
The development law tool of polymer melt is of great significance during in situ quantitation sign injection moulding.Currently, shaped
Journey online measuring technique also depends on traditional means such as thermocouple, pressure sensor etc., and traditional detection method is not only
Unitary function, the response time is slow, and sensitiveness and stability are poor, but also can not reflect the truth of melt.Ultrasonic wave conduct
A kind of mechanical wave, the mold cavity and directionality that can penetrate closing is good, while have probe easy for installation, not destructive test pair
As signal feedback speed is fast, the advantages of abundant in content, has very wide application in polymer injection moulding in-situ characterization
Prospect.
However, it is a new technology that the ultrasonic in situ of polymer injection moulding process is characterized, its theoretical, method is ground to experiment
Study carefully not overripened, most of current research also rests on qualitative stage.Ultrasonic signal is mainly spread speed and decay
Coefficient, the different ultrasonic signal of different melt state correspondences, and it is typically subject to non-isothermal during polymer injection moulding
Field and the comprehensive function of high shear field, there is similar action effect in temperature field, such as cuts with shearing field to polymer melt state
Shear is dilute.If non-isothermal and high shear field can not be distinguished to the influence that polymer melt develops behavior, can not
Can realize that polymer injection moulding Quantitative in situ is characterized.Wang Kejian etc. is in the Chinese patent literature of Publication No. 101799451A
Set of device is developed, material pressure-specific volume-temperature relation, apparatus of the present invention different from the device are characterized using ultrasonic signal
The ejection situation of high shear field can be provided, be more nearly with actual production process.
The content of the invention
Can be used for during detection injection moulding material pressure in die cavity, temperature, super it is an object of the present invention to provide one kind
The characterization apparatus of acoustical signal, are capable of achieving associating to physical property in die cavity during injection moulding and ultrasonic signal, are based on
This, is capable of achieving to better control over injection moulding process.
The present invention utilizes the related physical quantities such as ultrasonic signal speed, decay, on the basis of rheometry object viscosity
On, realization is added under ultrasound detection, to material Quality Research.
A kind of ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding, including mould bases, it is fixed on mould
Core rod in frame and the injector fed to core rod, the core side wall are provided with two groups or more for core rod
The detection unit that material is detected in die cavity, every group of detection unit include detection temperature signal, pressure signal sensor with
And ultrasonic probe；The die cavity is narrow slit structure.
Preferably, the thickness of the narrow slit structure is below 2mm.As further preferred, the thickness of the narrow slit structure
It is 1mm or so to spend, such as can be 1.2~1.5mm.By changing the form of core rod, change thickness, but thickness requirement is satisfied by
Above-mentioned condition.On the one hand consider that the injection speed highest of general injector can reach 20~40cm3/ s, small slit thickness
Device can be ensured under certain injection speed, bigger melt shear speed is obtained, on the other hand, the ultrasound letter for detecting
Number it is the average of melt parameter on whole path, therefore small slit thickness, the unevenness of inner melt can be reduced, so that
The narrow slit structure of the degree of accuracy of detection, the i.e. present invention using above-mentioned thickness is lifted, can avoid producing skin-core structure, influence is super
The collection of acoustical signal.
In the present invention, can be according to difference the need for, process narrow slit structure of different shapes；It is described narrow for example as preferred
Crack structure can in vertical bar shape, circle, ellipse, roundabout S types arrangement, with meet it is different research operating modes the need for.
Used as further preferred, the narrow slit structure is the vertical bar shape structure arranged up and down, and top is material inlet, bottom
It is material outlet.In the present invention, the width of vertical bar shape structure may be configured as it is equal, in order to the calculating of fluid parameter.The present invention
Using bottom there is the narrow slit structure of outlet to realize the detection to material, it is possible to achieve on-line checking, while detection can be ensured
Carried out under material stable state, further avoid the adverse effect that parameter of materials wave zone comes.
Preferably, the detection unit is two groups, the detection temperature signal, the sensor of pressure signal are pressure temperature
Degree sensor.
Preferably, in every group of detection unit, the pressure-temperature sensor is located at vertical with the central shaft of ultrasonic probe
In on the straight line of slit.
Preferably, the core rod includes dynamic model block and cover half block, the dynamic model block is provided with groove structure, dynamic model block and
When determining module sealing docking, the groove structure forms described narrow slit structure.Using the technical scheme, adding for slit is facilitated
Work, while so that the structure of core rod is more simple.Certainly, as the scheme that other can be selected, the narrow slit structure can also
Docked by the groove structure being arranged on dynamic model block and cover half block simultaneously and formed.
Preferably, the mould bases includes moving platen, the dynamic model block is detachably arranged on the moving platen.Using
The technical program, can change structure, thickness and shape of slit etc., it is ensured that can be more fully by changing dynamic model block
Realize the detection to material.
Preferably, being provided with the ultrasonic probe on the dynamic model block；The sensor is installed on the cover half block.
Preferably, the cover half block is provided with the mounting groove for installing the sensor.It is provided with cover half block
Mounting groove, on the one hand reduces machined surface area, on the other hand, the space of cable cabling is provided for pressure-temperature sensor.
Characterization apparatus of the invention control mould (core rod) temperature using die heater in use, keep design temperature
It is constant, realize the detection to other specification under temperature controlled condition.In the device, in test position arrangement pressure and temp sensing
Device, there is provided real-time pressure, temperature parameter, and arrange ultrasonic probe Real-time Collection ultrasonic signal in correspondence position.Device is by more
Move module to realize the purpose of the thickness of regulation die cavity, by adjusting die cavity thickness, obtain more shear rates with pressure
Experiment condition is combined, for experiment provides more rich variable combining form.
The present invention changes flowing velocity of the polymer melt in die cavity by way of directly changing core rod.Compared to
Change flowing velocity by increasing block, design of the invention more can guarantee that slit inner melt flowing stabilization, reduce flow field
Influence of the fluid behavior change of the transient state that mutation causes to injection process polymer melt physical property.
The position of pressure-temperature sensor is not limited in the present invention, positional distance entrance and exit a certain distance
.In die cavity opposite side, two correspondence positions of pressure-temperature sensor axis install two ultrasonic probes, one a pair
Should, it is connected with ultrasonic signal transmission, receiving channel respectively by signal transmssion line, the ultrasonic signal for send, receiving is at place
Filtered in reason system, computing etc., so as to obtain ultrasonic wave transmission speed of the polymer melt under non-isothermal and high shear field
Degree, amplitude attenuation situation.
The principle of characterization apparatus of the invention is the every physical parameter for obtaining polymer melt in an experiment, for example
Pressure, temperature, shear rate to measurement position etc., and these parameters are combined with the signal that ultrasonic probe is obtained, synchronous point
Analysis, obtains only temperature field, the incidence relation of melt property and ultrasonic signal only under shearing field or comprehensive field action.
Under known experiment condition, experimenter can obtain the physical property of more polymer melts, study specific
Under situation, the change of certain physical quantity and associates pass at influence for the evolved behavior of polymer melt with ultrasonic signal
System.
Viscosity is to characterize an important parameter during polymer melt evolved behavior, and temperature and shear rate are all
Have a certain impact effect to viscosity, therefore, in the experimentation of the present apparatus, it is wherein important to obtain the viscosity number of polymer
A part.
The Computing Principle and formula of viscosity introduced below and shear rate：
According to pressure and the geometry of die cavity, cutting inside melt can be calculated according to kinetic force equilibrium equation
Shearing stress, calculating formula is as follows：
τ 2lw=Δs Phw (1)
In formula, τ represents shear stress, and l represents two used distances of pressure-temperature sensor, and w represents die cavity
Width, Δ P represents the pressure differential of above-mentioned two sensor, and h represents the thickness of die cavity.
More generally, if setting up plane rectangular coordinates by origin of slit center, melt flows direction is x-axis positive direction,
Thickness direction is y-axis direction, then in thickness for the equation at y is：
τxy2lw=Δs P2yw (2)
According to newton shearing stress formula, have
uxSpeed of the melt in x-axis direction is represented, η represents the dynamic viscosity of melt, and γ represents shear rate, to duxProduct
Point, when bringing y=h/2 into, ux=0, obtain：
To uxDydz is integrated, and can obtain volume flow Q：
W represents the width of slit in formula, and bringing formula (5) into formula (3) obtains：
As y=h/2,
When fluid is non-newtonian fluid, and during for shear thinned fluid, in thicknessPlace, shear rate
Equal with Newtonian fluid, now, apparent shear rate is：
In formula,Wherein, n is the constant relevant with material character.χ is the weak phase relevant with n
Close function, it is generally the case that χ takesWhen, error is no more than 3%.
Use γrepThe shear rate of sign, convolution (1), is combined with known shear stress, and we can be somebody's turn to do
The calculated value of polymer melt dynamic viscosity η under experiment condition, and the calculated value is equal with practical viscosity.
Viscosity in view of polymer melt is larger, and at higher shear rates, viscous dissipation will can not be ignored fluid,
The fluctuation in the polymeric inner temperature field that viscous dissipation causes, will cause the accuracy of experimental result to decline, and we introduce here
One dimensionless number, Brinkmann number Br.
η represents the viscosity of melt, u0The characteristic velocity of fluid is represented, k represents the thermal conductivity factor of fluid, and Δ T represents fluid
With the temperature difference of wall.
When Br is less than 1, it is believed that the heat that viscous dissipation is produced is less than the heat of wall heat conduction conduction, such
Under the conditions of, it can be assumed that the Influence of Temperature Field that viscous dissipation brings can be ignored in experimentation.Therefore, we can be by cloth
Lin Keman numbers obtain flow velocity u in experimentation0Span, obtain the span of shear rate indirectly, improve experiment accurate
Exactness.
The concrete operations situation of experiment of the invention can be divided into following three kinds：
Control melt temperature is constant, i.e., temperature field is constant, changes injection rate, so as to be pressed under different shearing fields
The parameters such as power, temperature, ultrasonic signal, the incidence relation of evolution of magmatic melts behavior and ultrasonic signal under the conditions of research experiment.Separately,
During experiment, controlled injection constant airspeed, i.e. shearing field are constant, change melt temperature, under different melt temperatures, obtain same
Above identical items experiment parameter, the incidence relation of evolution of magmatic melts behavior and ultrasonic signal under the conditions of research experiment.
Similarly, in experimentation, can comprehensively change temperature field and shearing field, study the polymer under this kind of conditioning
The evolved behavior of melt and the incidence relation of ultrasonic signal.
Concrete operation step：
Material is stored in the barrel of injector, according to the property of material, the corresponding time is dried before testing.
Whole system is connected before test, prepares xerophilous raw material, in the good mould of injector over-assemble, and install corresponding
Dynamic model block, start pressure-temperature sensor and ultrasonic system, the normal operation of inspection simultaneously can rapid extraction signal.Start mould
Warm machine, adjusts the temperature control of mould in setting value, starts and hot injection machine.
In injector, various process parameters during setting material injection, by injecting cooling several times after, make the experiment be
System stabilization, and start experiment.
Setting mold temperature is constant, changes the injection speed of injector, and under different shear rates, record system is steady
The parameters value of pressure-temperature sensor after fixed, meanwhile, obtained under corresponding ultrasonic signal, and preservation with ultrasonic system
Come.
Dynamic model block is changed, changes die cavity thickness, obtain the experimental data value under another die cavity thickness.Repeated measurement, note
Record, can arrange the data under different die cavity thickness conditions.Afterwards, each item data that will be obtained, is processed, and is mapped or numerical value
Analysis, obtains temperature, shear rate, pressure etc. and ultrasonic velocity, the corresponding relation between attenuation coefficient and phase difference etc..And
Further analysis quantitatively obtains the parameters of evolved behavior and the associating for ultrasonic signal of polymer melt.
Separately, the injection speed that can set injector is constant, under different temperature fields, the step of completion ibid.
Similarly, temperature field and shearing field can be comprehensively changed during experiment, record temperature, pressure ginseng identical with first two scheme
Number, and do related data analysis with reference to viscosity and ultrasonic signal.
On-line operation step：
Using the measuring principle of device, device can be expanded the on-line measuring device for being applied to polymer injection moulding
In, the core rod outer surface of mould in actual forming process can be arranged on ultrasonic probe, under Non-Destructive Testing actual condition, will
The rule of the quantitative analysis achievement that off-line operation is obtained, in applying to on-line checking, with ultrasound feedback characterization polymer
Evolved behavior inside die cavity, realizes the real time on-line monitoring of injection moulding process.
This project is sheared the experiment research platform of polymer crystallization evolved behavior ultrasonic characterization under field action by development temperature,
Polymer melt evolved behavior is associated with ultrasonic under the device can study only temperature field, only shearing field or comprehensive field action
System.
Other research methods are different from, the present invention is originally proposed, using the present apparatus by two kinds of temperature field and shearing field
Condition is separately studied, constant or under conditions of shearing field is constant in temperature field individually using a kind of influence factor as variable, is changed
Another variable, so as to study the incidence relation of the lower polymer melt evolved behavior of variable effect and ultrasonic signal.
Certainly, the present apparatus can be provided in comprehensive experiment condition off field, and can simulate more reality processing works
More complicated actual conditions are provided certain Research Thinking by condition
The corresponding temperature that the present invention is obtained by using the present apparatus in test point position, pressure, ultrasonic signal, and add
According to the shear rate that injector basal rate is calculated, Synchronization Analysis polymer melt is under non-isothermal and high shear field
Experiment parameter, studies the evolved behavior of polymer melt under these Parameters variations, realizes quantifying for polymer injection moulding process
In-situ characterization, while also for the on-line checking of polymer injection provides a kind of new thinking.
Brief description of the drawings
Fig. 1 is the operation principle of the ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding of the invention
Schematic diagram；
1st, moving platen；2nd, solid plate；3rd, base plate；4th, top board；5th, dynamic model block；6th, ultrasonic probe；7th, pressure-temperature sensor；
8th, polymer melt；9th, screw of injection machine；10th, square iron；
Fig. 2 is the disassemblying structure of the ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding of the invention
Schematic diagram；
Fig. 3 is the structural representation of another angles of Fig. 2；
Fig. 4 is the associated diagram of the GPPS decay of ultrasonic wave and melt temperature at a temperature of different melt；
Fig. 5 be GPPS in cooling procedure, ultrasonic attenuation and melt temperature change with time corresponding relation figure.
Specific embodiment
The present invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is that the operation principle of the ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding of the present invention is shown
It is intended to, including mould bases, core rod and the part of injector three, specifically include such as lower component：Moving platen 1, solid plate 2, base plate 3, top board
4th, dynamic model block 5, ultrasonic probe 6, pressure-temperature sensor 7, polymer melt 8, screw of injection machine 9, square iron 10.
The corresponding installation drawing of mould bases, core rod as shown in Figures 2 and 3, part moving platen 1, base plate 3, solid plate 2, top board 4,
The grade of square iron 10 constitutes molded base part, is mainly used in fixed and positions.Top board 4 is provided with thin mouth of a river running channel 14.Wherein moving platen 1 is led
It is used to fix dynamic model block 5, solid plate 2 is mainly used in fixing cover half block 11.Top board 4 is provided with cast gate 12 and push rod 15, cast gate
12 are used to pour into a mould polymer masses.Mould bases can select commercially available standard die set, and the mould bases used in the present embodiment is the thin mouth of a river
Mould bases.Dynamic model block 5 and the cover half block 11 that is fixed on inside solid plate 2 constitute core portion, dynamic model block 5 towards cast gate 12 one
Side is provided with groove structure, and the groove structure bottom is provided with opening, and docking composition thickness two-by-two by dynamic model block 5 and cover half block 11 is
The narrow slit structure of 1mm or so, slit it is opening down.Moving platen 1 and the side of dynamic model block 5 are provided with ultrasonic probe 6, corresponding another
The solid plate 2 and cover half block 11 of side are provided with pressure-temperature sensor 7, and both axis directions are mutually corresponded to, same for detecting
Highly locate temperature, pressure and the ultrasonic signal of polymer melt 8.Ultrasonic probe 6 and pressure-temperature sensor 7 can be it is multigroup,
It is arranged on slit different height position, detection corresponding position polymer melt 8 temperature, pressure and ultrasonic signal, the present embodiment
In for ultrasonic probe 6, pressure-temperature sensor 7 be setting up and down two groups.It is provided with the solid plate 2 and cover half block 11 of mould
Groove structure, constitutes mounting groove, machined surface area is on the one hand reduced, on the other hand, for pressure-temperature sensor provides cable
The space of cabling.
As replace embodiment, above-mentioned slit can also be separately positioned on it is mutual right on dynamic model block 5, cover half block 11
The groove structure answered.
The present embodiment is main to be illustrated with being provided with the only dynamic model block 5 shown in Fig. 2 and Fig. 3 based on groove structure,
The groove structure can be the groove structure of various structures, such as can be the basically identical strip groove structure of width, or
Can be S type groove structures for the groove, or roundabout type being circular layout etc., can adjust according to actual needs.This implementation
Groove is the basically identical strip groove structure of width in illustration 2 and Fig. 3, and top is charging aperture, and bottom is discharging opening.
Warm coolant flow channel interface 13 is respectively equipped with moving platen 1, dynamic model block 5, solid plate 2, cover half block 11, it is right to be easy to implement
Dynamic model block 5,11 controls of temperature of charge of cover half block.
In the present embodiment, mould controls mold temperature with die heater in use, keeps the constant of design temperature, shows
Cooling, the heating flow channel in mould are eliminated in intention.In device, pressure-temperature sensor 7 is arranged in test position, there is provided real
When pressure, temperature parameter, and correspondence position arrange the Real-time Collection ultrasonic signal of ultrasonic probe 6.The device is by changing dynamic model
Block, by adjusting die cavity thickness, obtains the experiment bar of more shear rates and pressure come the purpose of thickness for realizing adjusting die cavity
Part is combined, for experiment provides more rich variable combining form.
The present invention, in the part of cover half block 11, is mounted with pressure-temperature sensor, for detect the temperature in injection process with
Pressure parameter, in the correspondence position of dynamic model block 5, is disposed with ultrasonic probe, and for the velocity of sound during test experience, amplitude declines
Subtract, the parameter such as phase difference.
Before experiment, the material injection that last experiment in screw of injection machine is left, until the material of injection (GPPS is
Example) stabilization after, start experiment.In experimentation, mold surface temperature is set 120 DEG C, using screw of injection machine by material
Clamp-oned from cast gate 6, die cavity is flowed into through meticulous mouth of a river running channel, and flowed out from the opening of mold bottom, after treating that flowing is stable, together
Step collects the pressure of test point, temperature, ultrasonic signal, and records.
Stop after injection, the part ejection in mould is sprayed certain releasing agent by die sinking, and preparation is injected next time.
The desired temperature of die surface is adjusted to 130 DEG C, 140 DEG C, 150 DEG C, and repeat the above steps, by what is obtained
Pressure, temperature, ultrasonic signal record.
By experiment, we can obtain polymer melt (by taking GPPS plastics as an example), and in different temperatures, (sensor is measured
Temperature), ultrasonic wave under the conditions of identical shear rate (being obtained by injection rate (flow) and the conversion of die cavity geometry)
Feedback signal, ultrasonic wave attenuation coefficient is associated with the temperature of GPPS.Fig. 4 illustrated at a temperature of different experiments, ultrasonic wave
Amplitude change associated with temperature, Fig. 5 illustrated in GPPS cooling procedures, the corresponding relation of temperature and ultrasonic signal.By
This is visible, and in actual production process, we can get up ultrasonic signal with temperature association, the temperature shape of monitor in real time melt
State.
Claims (9)
1. a kind of ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding, including mould bases, mould bases is fixed on
Interior core rod and the injector fed to core rod, it is characterised in that the core side wall is provided with two groups or more
For the detection unit detected to material in core rod die cavity, every group of detection unit includes detection temperature signal, pressure signal
Sensor and ultrasonic probe；The die cavity is narrow slit structure.
2. ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding according to claim 1, it is special
Levy and be, the thickness of the narrow slit structure is below 2mm, is arranged in vertical bar shape, circle, ellipse, roundabout S types.
3. ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding according to claim 1 and 2, its
It is characterised by, the narrow slit structure is the vertical bar shape structure arranged up and down, top is material inlet, and bottom is material outlet.
4. ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding according to claim 1, it is special
Levy and be, the detection unit is two groups, the detection temperature signal, the sensor of pressure signal are pressure-temperature sensor.
5. ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding according to claim 4, it is special
Levy and be, in every group of detection unit, the pressure-temperature sensor is located normal to the one of slit with the central shaft of ultrasonic probe
On bar straight line.
6. ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding according to claim 1, it is special
Levy and be, the core rod includes dynamic model block and cover half block, the dynamic model block is provided with groove structure, dynamic model block and determine module sealing
During docking, the groove structure forms described narrow slit structure.
7. the ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding according to claim 6, described
Mould bases includes moving platen, and the dynamic model block is detachably arranged on the moving platen.
8. the ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding according to claim 6, described
The ultrasonic probe is installed on dynamic model block；The sensor is installed on the cover half block.
9. the ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding according to claim 8, described
Cover half block is provided with the mounting groove for installing the sensor.
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| CN201710034472.2A CN106918640B (en) | 2017-01-18 | 2017-01-18 | The ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113715284A (en) * | 2021-08-31 | 2021-11-30 | 中南大学 | Online polymer viscosity detection system and method for micro-scale rectangular slit |
| CN114407314A (en) * | 2022-01-24 | 2022-04-29 | 拓凌机械(浙江)有限公司 | Micro injection mold with in-mold rheology online measurement function and measurement and control method |
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