CN109501185A - Injection molding process on-line monitoring method - Google Patents
Injection molding process on-line monitoring method Download PDFInfo
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- CN109501185A CN109501185A CN201811425715.6A CN201811425715A CN109501185A CN 109501185 A CN109501185 A CN 109501185A CN 201811425715 A CN201811425715 A CN 201811425715A CN 109501185 A CN109501185 A CN 109501185A
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- pressure curve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76006—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/7604—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76066—Time
- B29C2945/76076—Time duration
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention relates to injection molding arts, and in particular to a kind of injection molding process on-line monitoring method.First pressure sensor and second pressure sensor are installed respectively in the nearly gate area of product and type chamber end, acquisition first pressure sensor and the data of second pressure sensor obtain the first cavity pressure curve and the second cavity pressure curve respectively, observe the first cavity pressure curve and the second cavity pressure curve, melt is obtained in the practical flow regime of injection stage, packing stage, cooling stage, realizes the on-line monitoring of injection molding process.Two cavity pressure curves are drawn in by the cavity pressure data that two capacitance pressure transducer,s of nearly gate area and type chamber end are collected, can understand that melt in the status information of injection, pressure maintaining and cooling stage, realizes the on-line monitoring of injection phase.
Description
Technical field
The present invention relates to injection molding arts, and in particular to a kind of injection molding process on-line monitoring method.
Background technique
Injection molding process is widely used in each industrial circle, is a kind of important way for producing plastic products.Currently, each
Field is higher and higher to the quality requirement of plastic products, and Shooting Technique of the quality of plastic products with product in injection moulding process
Parameter has inseparable connection.But the adjustment of molding proces s parameters is lacked mainly according to the experience of engineer
Reliable scientific basis, and inefficiency.
Requirement with people to plastics molded part quality and yield is higher and higher, the control of injection moulding process and quality
The hot spot at research is controlled.For giving material, the quality of material is highly dependent on processing conditions, and this generates exploitations to use
In the demand for the intelligent injection mold technology that injection moulding process is monitored and controlled.However, in default of can be online to quality of item
The sensor of real-time measurement does not have general, accurate mathematical model, real nothing between process control variable and quality of item parameter
Manual intervention is needed, and the injection-molded item line Quality Control of cost within an acceptable range is realized not yet.
By correlation theory research in recent years and it was verified that under set injection device and material, cavity pressure is supervised
Survey technology is to ensure that the effective means of long-time production stability and product quality.The quality of injected articles by cavity pressure (P),
Melt specific capacity (V), temperature (T) three elements determine.For theoretically, as long as the equilibrium of this three elements is kept to ensure that product
Quality.Under existing technical conditions, temporarily fail the measurement method for proposing to directly acquire melt specific capacity, only cavity pressure
With temperature high-acruracy survey, and further control on this basis can be realized by method appropriate.Wherein, type chamber pressure
Power is the procedure parameter of practical injection molding of plastics, it truly has recorded the situation of change that melt occurs in injection process,
Including melt injection stage, packing stage, cooling stage practical flow regime.Cavity pressure technology is research injection technique
Relationship between quality provides true detailed procedural information, to instruct people to analyse injection technique process scientifically, solves
Practical problem provides reliable theoretical foundation.
Summary of the invention
The purpose of the present invention is to the defects of the prior art, provide a kind of based on cavity pressure, realization injecting products
The injection mold and its on-line monitoring method of on-line monitoring, product quality control and molding proces s parameters monitoring.
A kind of injection molding process on-line monitoring method of the present invention, technical solution are as follows: product nearly gate area and
First pressure sensor and second pressure sensor are installed in type chamber end respectively, acquire first pressure sensor and second pressure
The data of sensor obtain the first cavity pressure curve and the second cavity pressure curve respectively, and it is bent to observe first cavity pressure
Line and the second cavity pressure curve obtain melt in the practical flow regime of injection stage, packing stage, cooling stage, realize
The on-line monitoring of injection molding process.
More preferred, the first pressure sensor is arranged on the intracavitary melt flow path direction of type, and described first
Pressure sensor is located in first 1/3 section of flow path.
It is more preferred, when the product is the product that cross section changes greatly, the first pressure sensor installation
In type chamber cross section maximum position.
More preferred, the on-line monitoring includes that product qualification judges, method are as follows:
According to optimal processing parameter, optimal cavity pressure curve is simulated；
The tolerance between the first cavity pressure curve and optimal cavity pressure curve is calculated, judges that the tolerance is
It is no in the range of tolerable variance of calibration；
If the tolerance, in the range of tolerable variance of calibration, the product is qualified products；
If the tolerance, not in the range of tolerable variance of calibration, the product is substandard product.
It is more preferred, when injected plastics material is PP material, the optimal processing parameter be 0.15s injection time, melt
Temperature is 260 DEG C, and mold temperature is 50 DEG C, dwell pressure 34MPa, dwell time 8s.
More preferred, the on-line monitoring includes that molding proces s parameters adjust, method are as follows:
According to optimal processing parameter, optimal cavity pressure curve is simulated；
The first cavity pressure curve is compared with optimal cavity pressure curve；
If the first cavity pressure curve and optimal cavity pressure curve co-insides, without adjusting molding proces s parameters；
It is fast according to being injected in molding proces s parameters if the first cavity pressure curve is not overlapped with optimal cavity pressure curve
Influence of the mold temperature to cavity pressure curve, Shooting Technique ginseng in influence of the rate to cavity pressure curve, molding proces s parameters
Influence of the dwell time to cavity pressure curve in influence and molding proces s parameters of the dwell pressure to cavity pressure curve in number,
The factor for leading to the first cavity pressure curve deformation is analyzed, the factor is injection rate, mold temperature, pressure maintaining pressure
Power, any one or more parameter is bigger than normal or less than normal in the dwell time；
Corresponding technological parameter is adjusted for the factor, makes the first cavity pressure curve and optimal cavity pressure curve weight
It closes.
More preferred, the pressure sensor is capacitance pressure transducer,.
The invention has the benefit that
1. collecting the cavity pressure value in injection moulding process using capacitance pressure transducer, it can continuously measure material and exist
Cavity pressure in entire process of injection molding, obtained data are coherent and easily analyze.
2. the cavity pressure data collected by two capacitance pressure transducer,s of nearly gate area and type chamber end
Two cavity pressure curves are drawn in, can understand that melt in the status information of injection, pressure maintaining and cooling stage, realizes injection phase
On-line monitoring.
3, by calculating the tolerance for measuring resulting cavity pressure curve and emulating resulting optimal cavity pressure curve, sentence
Qualified or not, the raising yields of disconnected injecting products.
4, the influence by each technological parameter to cavity pressure tracing pattern divides the cavity pressure curve of measurement
Analysis, can intuitively judge very much whether technological parameter reasonable, do not need veteran mode transfer master worker can be transferred to it is optimal
Parameter meets production requirement；Parameter can be fast and effeciently modified, the waste of die trial is reduced and production shape can be entered quickly
State.
Detailed description of the invention
Fig. 1 is the position schematic diagram of two sensors of the invention；
Fig. 2 is the first cavity pressure curve and the second cavity pressure curve synoptic diagram of the invention；
Fig. 3 is each characteristic point schematic diagram of cavity pressure curve；
Fig. 4 is that cavity pressure curve tolerance of the present invention calculates schematic diagram；
Fig. 5 is influence schematic diagram of the injection rate to cavity pressure curve；
Fig. 6 is influence schematic diagram of the mold temperature to cavity pressure curve；
Fig. 7 is influence schematic diagram of the dwell pressure to cavity pressure curve；
Fig. 8 is influence schematic diagram of the dwell time to cavity pressure curve.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for this hair is well understood
It is bright, but they limiting the invention.
In injection process, macromolecule melt enters type chamber by cast gate by screw rod rotary squeezing.Capacitive pressure sensing
Device is mounted on to be had the phenomenon that gate location is observed that: melt enters type chamber, namely start injection at the time of, injection/guarantor
At the time of crush-cutting changes, at the time of pressure maintaining terminates cooling start.It can also be surveyed in the position that type chamber end namely plastics finally fill
Obtain cavity pressure change information abundant: at the time of sand off, at the time of injection/pressure maintaining switches, pressure maintaining terminates cooling and starts
At the time of, open time.Particularly with the longer product of melt flow path, it is particularly important to increase measurement point in type chamber end.
As shown in Figure 1, installing first pressure sensor 1 and second respectively in the nearly gate area of product and type chamber end
Pressure sensor 2.First pressure sensor 1 is mounted on nearly cast gate and is located at melt flow path side, near selection cast gate
When measurement position, for being difficult to install the mold of sensor at nearly cast gate, preferably first pressure sensor 1 is mounted on and is being flowed
In preceding 1/3 range in path.For the product that cross section changes greatly, it should preferentially select cross section maximum namely setting time
Longest region.Wherein, first pressure sensor 1 and second pressure sensor 2 are capacitance pressure transducer,.
As shown in figure 3, injection molding process is the dynamic circulation process that can be divided into several important stages.Mould
Process of injection molding is divided into 5 feature apparent stages by 6 characteristic points on cavity pressure curve.The specific meaning of these characteristic points
Justice is as follows:
1, characteristic point 1.Screw rod in barrel is continually advanced anteriorly, and injection moulding process starts.At this point, plastic melt not yet connects
Force snesor is pressed, the measured value of cavity pressure sensor is 0.
2, characteristic point 1-2.Plastic melt is injected into mold cavity under the promotion of screw rod, by the running gate system of mold
Interior, after plastic melt contacts cavity pressure sensor, pressure sensor measures cavity pressure.
3, characteristic point 2.Plastic melt touches cavity pressure sensor.Hereafter, with the progress of injection process, die cavity pressure
The pressure value that force snesor measures constantly increases.
4, characteristic point 2-3.The stage is the mold filling stage.At this point, cavity pressure constantly increases, the size of stuffing pressure depends on
In mould intracavity wall to the flow resistance of plastic melt.
5, characteristic point 3.The point means plastic melt filled up completely with mould type chamber, is mold filling stage and packing stage
Ideal switching point.
6, characteristic point 3-4.The stage is packing stage.After plastic melt has filled mold cavity, injection molding machine needs
Continue to apply pressure to mold, constantly compresses plastic melt, to ensure that plastic melt is filled by complete compacting, and will not
There is a phenomenon where melts to flow backwards.In this stage, cavity pressure increases rapidly, and obtains maximum value.
7, characteristic point 4.With the continuous progress of pressure maintaining, cavity pressure has reached maximum value, and size is mainly by pressure maintaining pressure
Power and plastics physicochemical characteristic codetermine.
8, characteristic point 5.The point is gate solidification point, and after gate solidification, melt is no longer flow into or flows out mold cavity.Together
When, due to the solidification shrinkage of plastic melt, cavity pressure constantly reduces.
9, characteristic point 6.Plastic products solidify completely, and start to shrink, and it is 0 that cavity pressure returns again, injection moulding week
Phase completes.
After capacitance pressure transducer, measures the signal of pressure, it is converted into analog signal by A/D, is amplified by signal
Device is suitably amplified collected data, the modules of Input Software system, carries out data processing and signal output, most
After obtain the first cavity pressure curve 1a and the second cavity pressure curve 2a.The cavity pressure curve (measured near cast gate
One cavity pressure curve 1a) it is recorded from beginning packed type chamber.During packed type chamber, pressure uniformly rises.Second type chamber
The starting point of pressure curve 2a means the time point at melt arrival type chamber end.It can be seen that macromolecule melt is in type chamber
Internal Real Flow Field rate.At the same time, injection molding machine executes pressure maintaining switching action, and the cavity pressure into cast gate has and significantly mentions
It rises, also has corresponding response in type chamber end.The medium-sized intracavitary melt of pressure maintaining handoff procedure has carried out compacting and feeding process, until
Pressure reaches peak value.Dwell pressure is withdrawn from after pressure to reach to peak value, begins to cool process.
The present invention is optimized by CAE analog simulation, and reliable type chamber pressure is obtained after the Rational Simplification in calculating simulation
Force curve recommendation obtains optimal cavity pressure curve with this.Such as using standard tensile test specimen as product, the material that uses for
PP is obtained through CAE analog simulation, and optimal processing parameter is injection time for 0.15s, and melt temperature is 260 DEG C, and mold temperature is
50 DEG C, dwell pressure 34MPa, dwell time 8s.With this group of data mart modeling, then recorded according to capacitance pressure transducer,
Obtained cavity pressure curve is best cavity pressure curve.
As shown in figure 4, cavity pressure integrated value is integral of the cavity pressure to the time.By obtaining forming whole process or portion
Pressure curve area value in subregion, can apply cavity pressure curve integrated value.It is given on section [a, b] for one
Nonnegative function f (x), we want to determine the area of figure folded by curve representated by f (x) and X-coordinate axle, we can be by this
It is denoted as:Using this principle, arbitrarily one section in selection section [a, b], as long as the shaped form that experiment is obtained
Cavity pressure integrated value is compared with best cavity pressure curve cavity pressure integrated value, then according to the essence of required processing
Degree determines a value ε (i.e. calibration tolerance), as long as | SEmpirical curve-SAim curve| < ε, so that it may guarantee parts quality qualification.
In addition, also the first cavity pressure curve is compared with optimal cavity pressure curve；If the first cavity pressure is bent
Line and optimal cavity pressure curve co-insides, then without adjusting molding proces s parameters；If the first cavity pressure curve and optimal type chamber
Pressure curve is not overlapped, then the influence according to injection rate in molding proces s parameters to cavity pressure curve, molding proces s parameters
Influence and note of the dwell pressure to cavity pressure curve in influence of the middle mold temperature to cavity pressure curve, molding proces s parameters
Influence of the dwell time to cavity pressure curve in technological parameter is moulded, analyzing leads to the first cavity pressure curve deformation
Factor, the factor be injection rate, mold temperature, dwell pressure, in the dwell time any one or more parameter it is bigger than normal or
It is less than normal；Corresponding technological parameter is adjusted for the factor, makes the first cavity pressure curve and optimal cavity pressure curve co-insides.
As shown in figure 5, influence of the injection rate to cavity pressure curve:
With the raising of injection rate, trend that the oriented upper left of cavity pressure curve gradually deviates.The raising of injection rate
The time that the type chamber of reducing is full of, the time for reaching pressure peak move to left therewith.The raising of injection rate also makes cavity pressure
Peak value constantly increases, and skyrockets after injection rate is more than certain numerical value；This filling velocity of explanation at this time has made
Melt is instantaneously full of type chamber, becomes before V/P conversion and produces the high pressure of moment type is intracavitary.
As shown in fig. 6, influence of the mold temperature to cavity pressure curve:
With the raising of mold temperature, trend that the oriented upper right of the right-hand component of cavity pressure curve gradually deviates.This says
Bright cooling rate slows down with the raising of mold temperature, and cooling time increases, and curve right-hand component curvature is gradually reduced, cooling
Rate gradually decreases.Curve left-hand component essentially coincides, and starts the time of filling, the time of V/P switching and cavity pressure top
Peak illustrates influence very little of the variation of mold temperature for melt filling almost without changing.The cavity pressure value of curve
It is gradually increased with the raising of mold temperature.
As shown in fig. 7, influence of the dwell pressure to cavity pressure curve:
With the increase of dwell pressure, trend that the oriented upper right of cavity pressure curve gradually deviates.Obviously, cavity pressure peak
The change of value and dwell pressure are in the relationship of strong correlation.In other words, the size of cavity pressure peak value is mainly determined by dwell pressure,
The influence factor of next is respectively injection speed, part shape, material property, mold temperature, melt temperature etc..The type chamber of curve
Pressure integrated value is similar with the variation of pressure peak, and numerical values recited is the increase with dwell pressure and increases.
As shown in figure 8, influence of the dwell time to cavity pressure curve:
With the increase of dwell time, cavity pressure curve has the tendency that gradually deviating to the right.It is identical as dwell pressure,
The dwell time influence curve form cooling procedure that mainly partial trace declines on the right, determines melt in the hair of cooling procedure
Raw metamorphosis has little effect technical process before.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (7)
1. a kind of injection molding process on-line monitoring method, it is characterised in that: nearly gate area and type chamber end in product
First pressure sensor and second pressure sensor are installed respectively, acquire the number of first pressure sensor and second pressure sensor
According to the first cavity pressure curve and the second cavity pressure curve is obtained respectively, the first cavity pressure curve and second type are observed
Cavity pressure curve obtains melt in the practical flow regime of injection stage, packing stage, cooling stage, realizes injection molding work
The on-line monitoring of skill.
2. injection molding process on-line monitoring method according to claim 1, it is characterised in that: the first pressure sensing
Device is arranged on the intracavitary melt flow path direction of type, and the first pressure sensor is located in first 1/3 section of flow path.
3. injection molding process on-line monitoring method according to claim 1, it is characterised in that: when the product is transversal
When the product that face changes greatly, the first pressure sensor is mounted on type chamber cross section maximum position.
4. injection molding process on-line monitoring method according to claim 1, which is characterized in that the on-line monitoring includes
The judgement of product qualification, method are as follows:
According to optimal processing parameter, optimal cavity pressure curve is simulated；
Calculate the tolerance between the first cavity pressure curve and optimal cavity pressure curve, judge the tolerance whether
In the range of tolerable variance of calibration；
If the tolerance, in the range of tolerable variance of calibration, the product is qualified products；
If the tolerance, not in the range of tolerable variance of calibration, the product is substandard product.
5. injection molding process on-line monitoring method according to claim 4, it is characterised in that: when injected plastics material is PP material
When material, the optimal processing parameter is injection time for 0.15s, and melt temperature is 260 DEG C, and mold temperature is 50 DEG C, pressure maintaining pressure
Power is 34MPa, dwell time 8s.
6. injection molding process on-line monitoring method according to claim 1, it is characterised in that: the on-line monitoring includes
Molding proces s parameters adjustment, method are as follows:
According to optimal processing parameter, optimal cavity pressure curve is simulated；
The first cavity pressure curve is compared with optimal cavity pressure curve；
If the first cavity pressure curve and optimal cavity pressure curve co-insides, without adjusting molding proces s parameters；
If the first cavity pressure curve is not overlapped with optimal cavity pressure curve, according to injection rate pair in molding proces s parameters
Influence of the mold temperature to cavity pressure curve in the influence of cavity pressure curve, molding proces s parameters, in molding proces s parameters
Influence of the dwell time to cavity pressure curve in influence and molding proces s parameters of the dwell pressure to cavity pressure curve, analysis
Lead to the factor of the first cavity pressure curve deformation out, the factor is injection rate, mold temperature, dwell pressure, guarantor
Press any one or more parameter in the time bigger than normal or less than normal；
Corresponding technological parameter is adjusted for the factor, makes the first cavity pressure curve and optimal cavity pressure curve co-insides.
7. injection molding process on-line monitoring method according to claim 1, it is characterised in that: the pressure sensor is
Capacitance pressure transducer,.
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