CN106918640B - 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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- CN106918640B CN106918640B CN201710034472.2A CN201710034472A CN106918640B CN 106918640 B CN106918640 B CN 106918640B CN 201710034472 A CN201710034472 A CN 201710034472A CN 106918640 B CN106918640 B CN 106918640B
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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
Abstract
The invention discloses a kind of ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding, including mould bases, the mold core being fixed in mould bases and the injector fed to mold core, it is characterized in that, the mold core side wall is equipped with two groups or more detection unit for being used to detect the intracavitary material of mold core type, and every group of detection unit includes detecting the sensor and ultrasonic probe of temperature signal, pressure signal；The type chamber is narrow slit structure.The present invention passes through the corresponding temperature that is obtained in test point position using the present apparatus, pressure, ultrasonic signal, and the shear rate being calculated according to injector basal rate is added, 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 the Quantitative in situ characterization of polymer injection moulding process, while also providing a kind of new thinking for the on-line checking of polymer injection.
Description
Technical field
The invention belongs to materials 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 technique
Polymer injection moulding process is a complicated dynamic changing process, is injected into after polymer melting closed
Shaped after cooling and solidifying in mold cavity, whole process polymer melt along with temperature and pressure acute variation.Online
The development law of polymer melt has a very important significance during in situ quantitation characterization injection moulding.Currently, it shaped
Journey online measuring technique also depends on traditional means such as thermocouple, pressure sensor etc., and traditional detection method is not only
It has a single function, the response time is slow, and sensibility and stability are poor, but also cannot reflect the truth of melt.Ultrasonic wave conduct
A kind of mechanical wave, can penetrate closed mold cavity and directionality is good, while have probe easy for installation, not destructive test pair
As, signal feedback speed is fast, it is abundant in content the advantages that, in polymer injection moulding in-situ characterization have very wide application
Prospect.
However, the ultrasonic in situ characterization of polymer injection moulding process is a new technology, 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 decaying
Coefficient, different melt states corresponds to different ultrasonic signals, and non-isothermal is typically subject to during polymer injection moulding
The comprehensive function of field and high shear field, temperature field has similar function and effect to polymer melt state with shearing field, such as cuts
Shear is dilute.It, can not if the influence that non-isothermal field and high shear field develop behavior to polymer melt cannot be distinguished
It is able to achieve polymer injection moulding Quantitative in situ characterization.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 that can provide high shear field, is more nearly with actual production process.
Summary of the invention
It is an object of the present invention to provide one kind can be used for detecting the medium-sized intracavitary material pressure of injection moulding process, temperature, surpasses
The characterization apparatus of acoustical signal is based on, it can be achieved that being associated with for intracavitary physical property medium-sized to injection moulding process and ultrasonic signal
This is, it can be achieved that preferably control injection moulding process.
The present invention utilizes ultrasonic signal speed, the related physical quantities such as decaying, on the basis of rheometry object viscosity
On, it realizes and 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
Mold core in frame and the injector fed to mold core, the mold core side wall are equipped with two groups or more and are used for mold core
The detection unit that the intracavitary material of type is detected, every group of detection unit include detect temperature signal, pressure signal sensor with
And ultrasonic probe；The type chamber is narrow slit structure.
Preferably, the narrow slit structure with a thickness of 2mm or less.As further preferred, the thickness of the narrow slit structure
Degree is 1mm or so, for example can be 1.2~1.5mm.By way of changing mold core, change thickness, but thickness requirement is all satisfied
Above-mentioned condition.On the one hand in view of the injection speed highest of general injector can achieve 20~40cm3/ s, small slit thickness
It can guarantee device under certain injection speed, obtain bigger melt shear rate, on the other hand, the ultrasound letter detected
Number it is that melt parameter is averaged on entire path, therefore small slit thickness, the unevenness of inner melt can be reduced, thus
The accuracy of detection is promoted, i.e. the present invention can influence to surpass using the narrow slit structure of above-mentioned thickness to avoid skin-core structure is generated
The acquisition of acoustical signal.
It, can be according to different needs, processing narrow slit structure of different shapes in the present invention；It is described narrow for example as preferred
Crack structure can be in vertical bar shape, circle, ellipse, detour S type arrangement, to meet the needs of different research operating conditions.
As further preferred, the narrow slit structure is straight-bar-shaped structure arranged up and down, and top is material inlet, bottom
For material outlet.In the present invention, the width of straight-bar-shaped structure may be configured as it is equal, in order to the calculating of fluid parameter.The present invention
There is detection of the narrow slit structure realization of outlet to material using bottom, on-line checking may be implemented, while can guarantee to detect
It is carried out under material stable state, further avoids parameter of materials fluctuation bring adverse effect.
Preferably, the detection unit be two groups, it is described detection temperature signal, pressure signal sensor be pressure temperature
Spend sensor.
Preferably, the pressure-temperature sensor is located at vertical with the central axis of ultrasonic probe in every group of detection unit
In on the straight line of slit.
Preferably, the mold core includes dynamic model block and cover half block, the dynamic model block is equipped with groove structure, dynamic model block and
When the sealing docking of cover half block, which forms the narrow slit structure.Using the technical solution, adding for slit is facilitated
Work, while making the structure of mold core more simple.Certainly, as the scheme that other can choose, the narrow slit structure can also be with
It is docked and is formed by the groove structure being arranged on dynamic model block and cover half block simultaneously.
Preferably, the mould bases includes moving template, the dynamic model block is detachably arranged on the moving template.Using
The technical program can replace structure, thickness and shape of slit etc., guarantee more fully by replacing dynamic model block
Realize the detection to material.
Preferably, being equipped with the ultrasonic probe on the dynamic model block；The sensor is installed on the cover half block.
Preferably, the cover half block is equipped with the mounting groove for installing the sensor.It is provided on cover half block
On the one hand mounting groove reduces machined surface area and on the other hand provides the space of cable cabling for pressure-temperature sensor.
Characterization apparatus of the invention utilizes die heater to control mold (mold core) temperature in use, keeps set temperature
It is constant, realize detection to other parameters under temperature controlled condition.In the device, in detection location arrangements pressure and temp sensing
Device provides real-time pressure, temperature parameter, and acquires ultrasonic signal in real time in corresponding position arrangement ultrasonic probe.Device is by more
The purpose that module move to realize the thickness of adjustment type chamber obtains more shear rates and pressure by adjustment type chamber thickness
Experiment condition combination provides richer variable combining form for experiment.
The present invention changes flowing velocity of the polymer melt in type chamber by way of directly replacing mold core.Compared to
Change flowing velocity by increasing block, design of the invention more can guarantee that the flowing of slit inner melt is stablized, reduce flow field
Influence of the fluid behavior change of transient state caused by being mutated to injection process polymer melt physical property.
In the present invention position of pressure-temperature sensor without limitation, positional distance entrance and exit a certain distance
.In the type chamber other side, the corresponding position of two pressure-temperature sensor axis installs two ultrasonic probes, and one is a pair of
It answers, is connect, sent, received ultrasonic signal is being located with ultrasonic signal transmission, receiving channel respectively by signal transmssion line
It is filtered in reason system, operation etc., to obtain ultrasonic wave transmitting 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 in an experiment, to obtain every physical parameter of polymer melt, such as obtain
To the pressure, temperature, shear velocity etc. of measurement position, and by these parameters in conjunction with the signal that ultrasonic probe obtains, synchronous point
Analysis, obtains only temperature field, only under shearing field or comprehensive field action melt property and ultrasonic signal incidence relation.
Under known experiment condition, the physical property of the available more polymer melts of experimenter is studied specific
Under situation, the change of certain physical quantity and is associated with pass with ultrasonic signal at influence for the evolved behavior of polymer melt
System.
Viscosity is the important parameter characterized during polymer melt evolved behavior, and temperature and shear rate are all
It has a certain impact effect to viscosity, therefore, in the experimentation of the present apparatus, it is wherein important for obtaining the viscosity number of polymer
A part.
The Computing Principle and formula of viscosity and shear rate introduced below:
According to the geometry of pressure and type chamber, cutting inside melt can be calculated according to kinetic force equilibrium equation
Shearing stress, calculating formula are as follows:
τ 2lw=Δ Phw (1)
In formula, τ indicates that shear stress, l indicate the distance of used two pressure-temperature sensors, w expression type chamber
Width, Δ P indicate the pressure difference of above-mentioned two sensor, the thickness of h expression type chamber.
More generally, if establishing plane rectangular coordinates by origin of slit center, melt flows direction is positive direction of the x-axis,
Thickness direction is y-axis direction, then with a thickness of the equation at y are as follows:
τxy2lw=Δ P2yw (2)
According to newton shearing stress formula, have
uxMelt is indicated in the speed of x-axis direction, η indicates the dynamic viscosity of melt, and γ indicates shear rate, to duxProduct
Point, when bringing y=h/2 into, ux=0, it obtains:
To uxDydz integral, can obtain volume flow Q:
W indicates the width of slit in formula, brings formula (5) into formula (3) and obtains:
As y=h/2,
When fluid be non-newtonian fluid, and be shear thinned fluid when, in thicknessPlace, shear rate
It is equal with Newtonian fluid, at this point, apparent shear rate are as follows:
In formula,Wherein, n is constant related with material properties.χ is related weak phase with n
Close function, it is generally the case that χ takesWhen, error is no more than 3%.
Use γrepThe shear rate of characterization, convolution (1), combines with known shear stress, we are available should
The calculated value of polymer melt dynamic viscosity η under experiment condition, and the calculated value is equal with practical viscosity.
In view of the viscosity of polymer melt is larger, at higher shear rates, viscous dissipation will can not be ignored fluid,
The fluctuation in polymeric inner temperature field caused by viscous dissipation will lead to the accuracy decline of experimental result, we introduce here
One dimensionless number, Brinkmann number Br.
η indicates the viscosity of melt, u0Indicate the characteristic velocity of fluid, k indicates that the thermal coefficient of fluid, Δ T indicate fluid
With the temperature difference of wall surface.
When Br is less than 1, it is believed that the heat that viscous dissipation generates is less than the heat of the thermally conductive conduction of wall surface, such
Under the conditions of, it can be assumed that viscous dissipation bring Influence of Temperature Field can be ignored in experimentation.Therefore, we can pass through cloth
Lin Keman number obtains flow velocity u in experimentation0Value range, obtain the value range of shear rate indirectly, it is quasi- to improve experiment
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, to be pressed under different shearing fields
Power, temperature, the parameters such as ultrasonic signal, the incidence relation of evolution of magmatic melts behavior and ultrasonic signal under the conditions of research experiment.In addition,
When experiment, controlled injection constant airspeed, i.e. shearing field are constant, change melt temperature, under different melt temperatures, obtain same
Above identical every experiment parameter, the incidence relation of evolution of magmatic melts behavior and ultrasonic signal under the conditions of research experiment.
Similarly, in experimentation, it can integrate and 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, dries the corresponding time before testing.
Whole system is connected before test, prepares xerophilous raw material, in the good mold of injector over-assemble, and is installed corresponding
Dynamic model block, start pressure-temperature sensor and ultrasonic system, examine and operate normally and can rapidly extracting signal.Start mould
Warm machine adjusts the temperature control of mold in setting value, starts simultaneously hot injection machine.
In injector, various process parameters when material injection are set, after injecting cooling several times, make experiment system
System is stablized, and starts to test.
It is constant to set mold temperature field, changes the injection speed of injector, under different shear rates, record system is steady
The various parameter values of pressure-temperature sensor after fixed, meanwhile, corresponding ultrasonic signal is obtained with ultrasonic system, and under preservation
Come.
Dynamic model block is replaced, change type chamber thickness obtains the experimental data value under another type chamber thickness.Repeated measurement, note
Record, can arrange the data under different shaped chamber thickness condition.Later, all data that will be obtained, is handled, mapping or numerical value
Analysis, obtains temperature, shear rate, pressure etc. and ultrasonic velocity, the corresponding relationship between attenuation coefficient and phase difference etc..And
Further analysis quantitatively obtains the parameters of evolved behavior of polymer melt and being associated with for ultrasonic signal.
In addition, the injection speed that can set injector is constant, under different temperature fields, the step of being same as above is completed.
Similarly, it can be integrated when experiment and change temperature field and shearing field, record temperature, pressure ginseng identical as first two scheme
Number, and combine viscosity to do relevant data to ultrasonic signal and analyze.
On-line operation step:
Using the measuring principle of device, device can be expanded to the on-line measuring device for being applied to polymer injection moulding
In, the mold core outer surface of mold in practical forming process can be mounted on ultrasonic probe, it, will under non-destructive testing actual condition
The rule for the quantitative analysis achievement that off-line operation obtains, applies in on-line checking, with ultrasound feedback characterization polymer
Evolved behavior in the intracavitary portion of type realizes the real time on-line monitoring of injection moulding process.
Development temperature is sheared the experiment research platform of polymer crystallization evolved behavior ultrasonic characterization under field action by this project,
The device can study polymer melt evolved behavior under only temperature field, only shearing field or comprehensive field action and be associated with ultrasonic
System.
Other research methods are different from, the present invention originally proposes, using the present apparatus by two kinds of temperature field and shearing field
Condition is separately studied, and individually using a kind of influence factor as variable, under conditions of temperature field is constant or shearing field is constant, is changed
Another variable, to study the incidence relation that the variable acts on lower polymer melt evolved behavior and ultrasonic signal.
Certainly, the present apparatus can be provided in comprehensive experiment condition off field, and can simulate more actual processing works
Condition provides more complicated actual conditions certain Research Thinking
The present invention is added by the corresponding temperature that is obtained in test point position using the present apparatus, pressure, ultrasonic signal
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 a kind of new thinking is provided for the on-line checking of polymer injection.
Detailed description of the invention
Fig. 1 is the working principle of the ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding of the invention
Schematic diagram；
1, moving template；2, solid plate；3, bottom plate；4, top plate；5, dynamic model block；6, ultrasonic probe；7, pressure-temperature sensor；
8, polymer melt；9, screw of injection machine；10, 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 schematic diagram of another angle of Fig. 2；
Fig. 4 is the associated diagram of GPPS decaying 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 relationship.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
Fig. 1 is that the working 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, mold core and injector three parts, specifically includes such as lower component: moving template 1, solid plate 2, bottom plate 3, top plate
4, dynamic model block 5, ultrasonic probe 6, pressure-temperature sensor 7, polymer melt 8, screw of injection machine 9, square iron 10.
The corresponding device figure of mould bases, mold core is as shown in Figures 2 and 3, component moving template 1, bottom plate 3, solid plate 2, top plate 4,
Square iron 10 etc. constitute molded base part, are mainly used for fixed and position.Top plate 4 is equipped with thin mouth of a river running channel 14.Wherein moving template 1 is main
It is used to fix dynamic model block 5, solid plate 2 is mainly used for fixed cover half block 11.Top plate 4 is equipped with cast gate 12 and mandril 15, cast gate
12 for being poured polymer masses.Mould bases can choose 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 being fixed on inside solid plate 2 constitute core portion, dynamic model block 5 towards cast gate 12 one
Side be equipped with groove structure, the groove structure bottom be equipped with opening, by dynamic model block 5 with cover half block 11 two-by-two dock constitute with a thickness of
The narrow slit structure of 1mm or so, slit it is opening down.Moving template 1 and 5 side of dynamic model block are equipped with ultrasonic probe 6, corresponding another
The solid plate 2 and cover half block 11 of side are equipped with pressure-temperature sensor 7, and the two axis direction corresponds to each other, same for detecting
Temperature, pressure and the ultrasonic signal of polymer melt 8 at height.Ultrasonic probe 6 and pressure-temperature sensor 7 can be multiple groups,
Setting detects 8 temperature of corresponding position polymer melt, pressure and ultrasonic signal, the present embodiment in slit different height position
In be ultrasonic probe 6, pressure-temperature sensor 7 is two groups setting up and down.It is provided on the solid plate 2 and cover half block 11 of mold
Groove structure constitutes mounting groove, on the one hand reduces machined surface area and on the other hand provides cable for pressure-temperature sensor
The space of cabling.
As the embodiment of replacement, above-mentioned slit is also possible to be separately positioned on dynamic model block 5, mutual right on cover half block 11
The groove structure answered.
The present embodiment is mainly illustrated based on groove structure with being only provided on dynamic model block 5 shown in Fig. 2 and Fig. 3,
The groove structure can be the groove structure of various structures, for example can be the almost the same strip groove structure of width, or
It can be the groove being circular layout, be also possible to S type groove structure of detour type etc., can adjust according to actual needs.This implementation
Groove is the almost the same strip groove structure of width in example diagram 2 and Fig. 3, and top is feed inlet, and bottom is discharge port.
Moving template 1, solid plate 2, is respectively equipped with warm coolant flow channel interface 13 on cover half block 11 at dynamic model block 5, is easy to implement pair
The control of 11 dynamic model block 5, cover half block temperature of charge.
In the present embodiment, mold controls mold temperature with die heater in use, keeps the constant of set temperature, shows
Cooling in mold, heating flow channel are omitted in intention.In device, in detection location arrangements pressure-temperature sensor 7, reality is provided
When pressure, temperature parameter, and corresponding position arrangement ultrasonic probe 6 in real time acquisition ultrasonic signal.The device passes through replacement dynamic model
Block obtains the experiment item of more shear rates and pressure by adjustment type chamber thickness come the purpose for realizing the thickness of adjustment type chamber
Part combination provides richer variable combining form for experiment.
The present invention is mounted with pressure-temperature sensor in 11 part of cover half block, for detect the temperature in injection process with
Pressure parameter is disposed with ultrasonic probe in the corresponding position of dynamic model block 5, and for the velocity of sound during test experience, amplitude declines
Subtract, the parameters such as phase difference.
Before experiment, the material injection that experiment last in screw of injection machine is left, until (GPPS is the material of injection
Example) stablize after, start to test.In experimentation, mold surface temperature is set 120 DEG C, using screw of injection machine by material
It squeezes into, is flowed out through meticulous mouth of a river running channel inflow type chamber, and from the opening of mold bottom, after flowing stabilization, together from cast gate 6
Step collects the pressure of test point, temperature, ultrasonic signal, and records.
After stopping injection, die sinking ejects the part in mold, sprays certain release agent, 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 acquisition
Pressure, temperature, ultrasonic signal record.
By experiment, in different temperatures, (sensor measures our available polymer melts (by taking GPPS plastics as an example)
Temperature), ultrasonic wave under the conditions of identical shear rate (converting to obtain by injection rate (flow) and type chamber geometry)
Feedback signal, ultrasonic wave attenuation coefficient is associated with the temperature of GPPS.Fig. 4 illustrates at a temperature of different experiments, ultrasonic wave
Amplitude variation be associated with temperature, Fig. 5 is illustrated in GPPS cooling procedure, the corresponding relationship of temperature and ultrasonic signal.By
This monitors the temperature shape of melt in real time as it can be seen that in the actual production process, we can get up ultrasonic signal and temperature association
State.
Claims (2)
1. a kind of ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding, including mould bases, it is fixed on mould bases
Interior mold core and the injector that mold core is fed, which is characterized in that the mold core side wall is equipped with two groups for mold core
The detection unit that the intracavitary material of type is detected, every group of detection unit include detect temperature signal, pressure signal sensor with
And ultrasonic probe；The type chamber is narrow slit structure；The narrow slit structure with a thickness of 1.2~1.5mm；The narrow slit structure is upper
The straight-bar-shaped structure of lower arrangement, the width of straight-bar-shaped structure is equal, and top is material inlet, and bottom is material outlet；The inspection
Testing temperature signal, pressure signal sensor be pressure-temperature sensor；In every group of detection unit, the pressure-temperature sensor
It is located at the central axis of ultrasonic probe perpendicular on the straight line of slit；The mold core includes dynamic model block and cover half block, described
Dynamic model block is equipped on groove structure or the dynamic model block and cover half block is equipped with mutual corresponding groove structure, dynamic model block simultaneously
When sealing docking with cover half block, which forms the narrow slit structure；The mould bases includes moving template, the dynamic model block
It is detachably arranged on the moving template；The ultrasonic probe is installed on the dynamic model block；It is equipped on the cover half block
The sensor.
2. the ultrasonic in situ characterization apparatus of non-isothermal high shear polymer injection moulding according to claim 1, described
Cover half block is equipped with the mounting groove for installing the sensor.
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| CN113715284B (en) * | 2021-08-31 | 2022-11-08 | 中南大学 | Polymer viscosity on-line detection system and method for micro-scale rectangular slit |
| CN114407314B (en) * | 2022-01-24 | 2024-04-05 | 拓凌机械(浙江)有限公司 | Micro injection mold with in-mold rheological online measurement function and measurement and control method |
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