CN109719915A - A kind of T-S fuzzy model and the application in injection moulding process control - Google Patents
A kind of T-S fuzzy model and the application in injection moulding process control Download PDFInfo
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- CN109719915A CN109719915A CN201811560442.6A CN201811560442A CN109719915A CN 109719915 A CN109719915 A CN 109719915A CN 201811560442 A CN201811560442 A CN 201811560442A CN 109719915 A CN109719915 A CN 109719915A
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Abstract
The invention belongs to injection molding technology fields, disclose a kind of T-S fuzzy model and the application in injection moulding process control, by carrying out data acquisition in injection stage, the state-space model of injection stage is obtained, and design to obtain valve opening u1 using classic control method；The state-space model and valve opening u2 of packing stage are collected by the data of packing stage；Final T-S fuzzy model is established by the Stute space model identification subordinating degree function to injection stage and packing stage；The u2 obtained using T-S fuzzy model and the u1 obtained to injection stage, packing stage obtains finally controlling signal u by recognizing subordinating degree function.The present invention is based respectively on two fuzzy submodels and establishes control rule；Smoothly transitting for final substantially two son control rules of control rule, does not need to switch, and avoids the concussion of switching bring control；Also avoid influence of the V/P switching time to control quality.
Description
Technical field
The invention belongs to injection molding technology field more particularly to a kind of T-S fuzzy model and in injection moulding process control
Application.
Background technique
Currently, the prior art commonly used in the trade is such that injection molding is also known as injection molding molding, it is a kind of injection
And the forming method of molding.The advantages of injection molding forming method is that speed of production is fast, high-efficient, operates and automation, pattern can be achieved
Wide in variety, shape can go from the simple to the complex, and size can be descending, and product size is accurate, and product easily updates, can be at
Complex-shaped product, injection molding are suitable for the processing and formings such as mass production and complex-shaped product field.In certain temperature
Under, the plastic material melted completely by helical screw agitator injects die cavity with high pressure and obtains the side of molded product after cooling and solidifying
Method.This method is suitable for the batch production of complex-shaped component, is important one of processing method.Injection moulding process is broadly divided into
6 stages below: molding, injection, pressure maintaining, cooling, die sinking, product take out.Wherein injection stage and packing stage are for product
Quality is most important.Propulsion is rotated forward according to certain setting value in the fltting speed of injection phase, screw rod.Until being molded
Journey nearly at the end of, screw rod stops rotating, only push ahead, at this time injection molding enter packing stage.Injection molding machine in pressure maintaining period
Nozzle constantly to type chamber feed supplement, to fill due to the volume that product is shunk and is vacated.Injection stage switches to packing stage, this
A inversion point is known as pressure maintaining switching control point, abbreviation V/P switching point.The selection of V/P switching time has weight to end product quality
Influence: turn pressure too early then will be easy to generate scarce material in this way using dwell pressure excessive melt drive-in chamber, if protecting
Press too late then product that can be compressed excessive, forming many positions has overlap and internal stress excessively high, and demoulding is not sufficiently stable, and increases product
Part is again etc..
Currently, switching mode usually has three classes: pressure-type V/P switching, time type V/P switching, position type V/P switching.Pressure
Power type V/P switching means that the priority of machine is pressure, when machine detects that injection instantaneous pressure reaches your V/P of setting and cuts
When changing pressure size, injection movement is just switched to pressure maintaining movement, until completing pressure maintaining.Position type V/P switching, when screw rod is penetrated
When setting out to accomplish the V/P switching position that you set, injection movement is just converted directly into pressure maintaining movement.The side of time type V/P switching
As soon as method require injection start after by the predetermined time discharge a switching signal, the time to convert pressure maintaining.Above-mentioned technical proposal is all
There are many deficiencies:
(1) pressure-type V/P switching is very high to the required precision of pressure sensor, increases cost, and such method is not
The variation of hydraulic oil, melt and mold temperature, the i.e. variation of injecting rate can be compensated.
(2) when pressure maintaining stroke very in short-term, position type V/P switching is just very unreliable because the variation of very little will lead to out
Pass cannot accurately start every time, in which case it is convenient to not switch over.
(3) time type V/P switching does not account for the melt compression, melt viscosity, charging precision or hydraulic of screw front end
The variation of pressure does not account for the variation that screw rod promotes rate yet, and the variation of hydraulic pressure can cause the variation of screw position
(end of charging stage, packing stage start) and corresponding stroke variation (feeding stroke, injection stroke), result system
The weight and size fluctuation of part quality especially product are larger.
Solve the difficulty and meaning of above-mentioned technical problem: in conclusion at present all V/P switchover policy have it is certain
Disadvantage, in some cases, effect are deteriorated；Once the selection of V/P switching point is bad, it just will affect the matter such as weight, the size of product
Figureofmerit.The present invention proposes a kind of completely new frame, using fuzzy membership function, abandons the thought of switching completely, realizes light
Sliding transition.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of T-S fuzzy model and in injection moulding process control
Application.
The invention is realized in this way a kind of T-S fuzzy model, the T-S fuzzy model is as follows, the T-S model
Non-linear process can be described with the model of approximately linear, the control problem especially suitable for injection moulding process:
Wherein, z is fuzzy premise variable；hiFor subordinating degree function；CcTo jointly control output matrix.
Another object of the present invention is to provide a kind of injection moulding process control method using the T-S fuzzy model, institutes
Stating injection moulding process control method includes: injection stage and packing stage.In injection stage, note is adjusted by operation valve opening
Firing rate degree；In packing stage, nozzle exit pressure is adjusted by operation valve opening.
Further, the model of the injection stage:
Wherein, u is valve opening；y1For injection speed；A1、B1、C1For the matrix of appropriate dimension.
Further, the model of the packing stage:
Wherein, u is valve opening；y2For nozzle exit pressure；A2、B2、C2For the matrix of appropriate dimension.
Further, the injection stage model obtains u using typical control design case method1；Similarly, it is based on pressure maintaining rank
Segment model, design obtain u2.Final control signal are as follows:
In conclusion advantages of the present invention and good effect are as follows: the present invention includes that injection stage and packing stage establish mould
Paste submodel；Gradually changing for fuzzy membership function is regarded in the transition of injection stage to packing stage as.It is based respectively on two moulds
It pastes submodel and establishes control rule；Smoothly transitting for final substantially two son control rules of control rule, does not obviously cut
It changes, avoids the concussion of control；Also avoid influence of the V/P switching time to control quality.
Detailed description of the invention
Fig. 1 is T-S fuzzy model provided in an embodiment of the present invention in injection moulding process control method flow chart.
Fig. 2 is T-S fuzzy model provided in an embodiment of the present invention in injection moulding process control method implementation flow chart.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
T-S fuzzy model provided in an embodiment of the present invention are as follows:
Wherein, z is fuzzy premise variable；hiFor subordinating degree function；CcTo jointly control output matrix.
As shown in Figure 1, T-S fuzzy model provided in an embodiment of the present invention includes following step in injection moulding process control method
It is rapid:
S101: by carrying out data acquisition in injection stage, the state-space model of injection stage is obtained, and utilize classics
Control method (PID, robust control, Model Predictive Control etc.) design obtains valve opening u1；Similarly, pass through packing stage
Data collect the state-space model and valve opening u2 of packing stage；
S102: final T- is established by the Stute space model identification subordinating degree function to injection stage and packing stage
S fuzzy model；
S103: the u2 obtained using T-S fuzzy model and the u1 obtained to injection stage, packing stage is subordinate to by identification
Degree function obtains finally controlling signal u.
Application principle of the invention is further described below with reference to embodiment.
The fuzzy submodel of each of embodiment of the present invention can be transmission function and be also possible to state-space model；Below
By taking state-space model as an example.
The model of injection stage is as follows:
Wherein, u is valve opening；y1For injection speed；A1、B1、C1For the matrix of appropriate dimension.
The model of packing stage is as follows:
Wherein, u is valve opening；y2For nozzle exit pressure；A2、B2、C2For the matrix of appropriate dimension.
Final T-S fuzzy model is as follows:
Wherein, z is fuzzy premise variable；hiFor subordinating degree function；CcTo jointly control output matrix.
Based on injection stage model, set using typical control design case method (PID, robust control, Model Predictive Control etc.)
Meter obtains u1；Similarly, it is based on packing stage model, design obtains u2.Final control signal are as follows:
Application effect of the invention is explained in detail below with reference to emulation.
By simulation result we it should be apparent that establish control rule based on two fuzzy submodels, make to be molded
Machine realizes smooth transition from injection stage to packing stage, avoids the concussion of control.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of T-S fuzzy model, which is characterized in that the T-S fuzzy model are as follows:
Wherein, z is fuzzy premise variable；hiFor subordinating degree function；CcTo jointly control output matrix.
2. a kind of injection moulding process control method using T-S fuzzy model described in claim 1, which is characterized in that the injection molding
Course control method for use includes: injection stage and packing stage.
3. injection moulding process control method as claimed in claim 2, which is characterized in that the model of the injection stage:
Wherein, u is valve opening；y1For injection speed；A1、B1、C1For the matrix of dimension.
4. injection moulding process control method as claimed in claim 3, which is characterized in that the injection stage model utilizes typical case
Control design case method obtains u1；Similarly, it is based on packing stage model, design obtains u2.Final control signal are as follows:
5. injection moulding process control method as claimed in claim 2, which is characterized in that the model of the packing stage:
Wherein, u is valve opening；y2For nozzle exit pressure；A2、B2、C2For the matrix of appropriate dimension.
6. T-S fuzzy model described in a kind of application claim 1 is in injection moulding process control method, which is characterized in that the T-S mould
Fuzzy model in injection moulding process control method the following steps are included:
Step 1 obtains the state-space model of injection stage, and utilize classical control by carrying out data acquisition in injection stage
Method processed designs to obtain valve opening u1；The state-space model and valve of packing stage are collected by the data of packing stage
Door aperture u2；
Step 2 establishes final T-S by the Stute space model identification subordinating degree function to injection stage and packing stage
Fuzzy model；
Step 3 passes through identification degree of membership using the u2 that T-S fuzzy model and the u1 obtained to injection stage, packing stage obtain
Function obtains finally controlling signal u.
7. it is a kind of using T-S fuzzy model described in claim 6 injection moulding process control method injection molding platform.
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