TW568825B - Intelligent iterative learning method for controlling filling and pressure-maintaining of injection molding device - Google Patents

Abstract

This invention relates to a method of servo-controlling an injection molding process completely from a filling phase to a pressure-maintaining phase, and particularly to one that allows for the establishment of initialization mechanism to prevent unsteadiness in control resulting from variations caused by mechanical errors of the injection molding device due to iterative computations as a result of different starting point of filling after a user enters the expected value (curve) parameters in a controller. With the enhanced control, the control of non-effective region can be realized and resolving the problem of controlling terminal quantity. To ensure a smooth switching from the filling phase to the pressure-maintaining phase, switch control quantity compensation is performed during the process from the filling phase switching to the pressure-maintaining phase so as to effectively control the whole process from the filling phase to the pressure-maintaining phase. Under such a control method, influence of the uncertainty within the injection molding system and variation of parameters on the control performance may be eliminated, thereby ensuring that the injection molding system can reach the expected objective, obtaining products of better quality.

Description

568825

Case number 9011678Q

V. Description of the invention (1) [Scope of the invention] The present invention is based on the user's expected parameter curve, through the re-initialization before filling and the robustness of the filling and holding pressure stages, v. = Switching from filling to protection Compensate for the switching point control amount when pressing, so that the output of the sampling point preset at the stage of filling blood = can meet the expectations set by the user. [Knowledge background] Because of the light weight of the plastic: As a result, plastic products have been widely used. In addition, the application of raw materials and raw materials has progressed from general use A to various J = m plastic parts, and has the advantage of high output and easy automation. Miscellaneous parts are mainly composed of $ # 、、 & t pounds to become plastic processing. =, And the injection device must be filled, melted, mixed, and boosted, with the same two major functions, that is, the melting of the The main role of plastic is to fit the mold into the cavity. Two types of ^ gf are used to shoot plastic from the heating cylinder. There are two common methods: plunger type and screw type. Promote two: Zhu Yi ::: Jin not). By the internal cooling of the hydraulic cylinder piston The products to be molded. The sub-drive screw rotates and can do the front: or back: jin: system; oil motor: make the hydraulic motor make the screw in the cylinder 'η after the sub-lock is completed 2 glue:;: force again = the motor drives a " 一 " " --- the front end of a heating cylinder, this page 4 568825 i No. 9011fi7 刖 5. Description of the invention (2) a correction-find * brother Ming -----: The finished product in t T is also After cooling down, re-opening the mold and ejecting the finished product from the mold with a period of Hi plug or spiral injection device 'its injection is Chu melt-open mold two tops:' broad closing mold-clamping-injection-holding pressure -Cool a whole shot, and so on. At the same time, the filling phase and the holding pressure phase in the "cycle" of the injection device are very significant and important for the good two after molding, and the two f are very significant and important. Among them, the fast before chemical transformation: d ΐ: the melting The plastic keeps its pressure while it cools. ， 八八 中, and when the cavity is filled, switch to high-temperature cooling to the second lowest: j is: In order to avoid the material plastic melt has compressible ^ 疋 王 fills the entire cavity, due to time, therefore The injection of the penalties comes from the fact that the pressure of the shooting seat screw continues to increase, but the melt glue and the force cannot be transmitted to the force until the mouth is cold. This filling and pressure control are a success; the impact of the heavy dagger '2 is very dramatic. Because of the operation of the controller, the injection molding machine user generally enters the molding cycle of each molding cycle. The interface receives the control law and changes the control target to the driving signal. • Hydraulic system, electric motor, etc.), the next step is to drive the unit (such as the control of filling and holding pressure, generally the operation of a type I action; and the control of the speed of the plunger to change the melt ^ It is made according to the pressure of the hydraulic cylinder or the nozzle when the screw is held or the pressure is maintained during filling. Pressure control of Moxian pressure, etc. $ 5Page 568825 Case No. 90116789 Amendment V. Description of Invention (3) The control method used in it :: Two-master control, • Open-loop control; its i is used as a controller ;: (Wide: = = force, screw speed) wheel and command, and then drive command is input to the driving prototyping corresponding to the zt tethered target for filling or pressure holding action; t: ^ screw or plunger injection machine is interfering and Has a high not 4 ;;;: In the second, the molding system is-high except for the impact of these changes and interference, 'also because: = road control can not eliminate the actual performance and control objectives often have a very open loop control system The external appearance: ί, if precise control is required, and resistance to injection molding Li Tongzhi-Cheng ίπ = system :: Natural choice, and feedback control * increase; "= two controllers are the most common, Modern times; the nature of injection and reform, and adaptive control has also been widely used. Its borrowing estimates: When the injection of control into the small pieces caused by the change, the time of filling and holding pressure must be reduced. It also means that the response of filling and packing is still working when the output is still Ended, so the above-mentioned design of the instant feedback controller * can not effectively control this kind of temporary system, so the actual filling and holding pressure ^ 〃 the goal set by the user The error between them still cannot be minimized; 'I HPWLMfUvi, ______________: ---------- V. Description of the invention (4) Guiming ί: Because filling and holding pressure are repeated cycles Operation, so use the method of / on behalf of learning 'its use of feedback during the week: time feedback! Under the iterative control, change the system's control. 系统 Make the system's continuous output reach the user's expectations. · Control system. Γ Xi control is used to control the filling and pressure control of the injection molding system. This method is also appropriately modified and improved, and n ψ At produces a molding jt! · Filling to the switching method of filling ^ * to make it possible to fill the filling performance of the performance process on the injection molding system. control. & W_ Ｍ 进 全 全, [Summary of the invention and the purpose of the invention] To achieve precise filling and holding pressure #Hands of the system *, and from the filling stage = have the capital = use the iterative mechanism to make iterative learning calculation The mechanical action of the newly initialized device will not be incorrect. The starting point will be caused by the injection phenomenon, which will cause: =? To cause unstable changes in the control amount. In addition, according to the input control =: the quality is more stable. And excellent. Data, continuously output the actual output value of the desired curve reference point at each injection rate, speed, and injection pressure, etc., and then check the preset detection, and then pass the strong Sex ^ ^ The pursuit of the desired trajectory is controlled from the amount of error. Health system 'to improve control of ineffective areas.

In order to switch the filling to the continuation phase of the holding pressure and the holding pressure, and when the pressure is under pressure, the control point of the switching point is adjusted ^ supplement ^ smooth, but it is clear from the description that the filling is switched to the implementation of the invention Known, but these detailed examples of the following specific examples are described in detail, the description and the drawings are for illustration purposes only.

No. 901] fi7SQ 5. Description of the invention (5) Should be limited to the spirit and scope of the book = 4, its specific implementation content [Detailed description of the implementation examples] Next · The user decides in advance the filling and pressure measuring points, And the expected output corresponding to the point of the desired rotation of the detection point is the length of time for each time holding pressure control. Then, the filling and injection molding device of the invention f are set at different times = set to perform filling and maintenance. "Institute II: nozzle pressure Ϊ Π (which is equivalent to injection rate control), holding pressure The filling phase will be ordered: when the injection is performed 2 times before, the actual position before the injection is adjusted to the value when the screw starts the beam, and the filling is completed and switched; the filling control 1 is during the execution of the filling time and pressure phase = 3; At the same time, the screw of the injection device is detected during the filling phase and the ground: the controller will be worthless during the 1 course, that is, the rotation of the No. 5: and nozzle pressure signals in the same cycle Hit on-the preset put, the value is wide :; After the robustness control f (·) is processed, you can get each of the next two Tuesdays' plus the actual control amount u "(t)-*- ^ Control amount after correction of each time history ^ (Page 8 568825 Case No. 90116789 V. Description of Invention (6) VII) The calculation formula is as follows: uj + 1 (t) = Uj (t) + K · F (ej (t)) ej = yd-yj (t) uJ + 1 (t) ·················· The table shows the control amount after correction in different time history. η before: the actual control amount in different time periods of the cycle. κ · Table enlarges the number of teas. Where a (t): table error amount. F (·): table robustness processing

Yd: Detect the expected rotation of detection points in different time history. 1 (t) · The actual output of the detection points in different time periods of the table. No, therefore, with the above formula, at different times = in the drive system of the input and output devices, the correction obtained through the study of the nose: humane, and human-reduced screw, Shooting 二 π] + i (t) makes the above-mentioned detection ", ^ 4 U say 'will gradually approach the desired trajectory shown in Figure 8), and because of the use of Bu, + ,,,,, Tian I's female white wave alien law will not cause the generation error of the child to fill, and will result in the system. The mechanical properties of the ancient injection molding device make the quality of the finished product more stable and excellent. Xiang Maosheng, and then 'calculated The control is performed in accordance with expectations, and then the control of the robustness% post-production control is adopted to avoid the control amount ^ H. Dead zone control interval (deadzone), filter equation robustness processing mechanism 2: Windup (WindUP) The problem occurred, and the 9th page 568825 case number 90116789 V. Description of the invention (7): —Amendment_

Or other person who can strengthen the control system, ‘& B out to P can prevent detection’ during the convergence process toward the desired curve, and the point's input is stable or even divergent, which will cause a jump, not. The stability of the service system of 1 is more improved, for filling!:, Because it includes the two stages of filling and holding, in order to make the connection of filling to holding pressure more pi & The compensation of the switching point control amount is the period # during which the switchover to the dust protection phase is performed, and the control amount at the beginning of the control stage J is the control amount. It is based on the principle of one-cycle pressure retention. The above-mentioned control method uses the initialization process and the compensation of the switch point control amount, which can eliminate the fixed factors and parameter changes of the injection shot. The second stage of the rate of fire: adverse effects, and then effective products can have better quality after molding, and the control of the current =, so that the degree of increase;! It is more than doubled, so it ’s really not a traditional method to reissue: Pay every month without paying 2: industrial use value, and more::, I urge you to grant a patent as soon as possible. Cataclysmic and progressive approach

Page 10 568825 Case No. 90116789 Λ_Ά Revision Simple description of the drawing [Simplified description of the drawing] The first diagram is a schematic diagram of a conventional plunger injection device. The second figure is a schematic view of the mold clamping of a conventional screw injection device. The third figure is an injection schematic diagram of a conventional screw-type injection device. The fourth diagram is a schematic diagram of the holding pressure and cooling of the conventional screw injection device. The fifth diagram is the fourth schematic diagram of the demoulding of the conventional screw injection device. The sixth figure is a schematic diagram of a general injection molding cycle. The seventh diagram is a schematic diagram of the control flow of the present invention. The eighth diagram is an S-T diagram of the screw of the present invention. [Schematic explanation] ~ (t): actual control amount uj + 1 (t) ·· control amount after correction e 』· (修正): error amount κ: amplification parameter

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Claims (1)

568825 ------ VI. The scope of patent application, Department 1 is matched by injection mechanism such as plunger controlled by I: charge type control method; plunger or phase = 2 Set the detection points to continuously control the editing: filling = guarantee, the user will fill in the library during the filling and repetitive stages = which includes: pressure% = expected output curve parameters of each detection point input: control = process and guarantee- The amount of error is obtained by forcing the large amount of parameters through the fortified structure = number ^ parent ', and then added to the control amount of this cycle, and =-the control point within the preset release period is controlled by the switching point control. The amount of control of holding pressure; Baye will wait for the next cycle, so continuously in the stage of filling and holding, so that the tracking error amount of each debt measurement point gradually converges, those with different curve parameters. Xiang Yuncheng is closer to expectation 2. According to the verbose control method described in item 1 of the scope of the patent application, the parameters of the expected curve during the refilling stage of re-injection to true pressure are corresponding to the filling: two: : It refers to the actual input volume of the detection point at the filling stage at the beginning of filling. The value of s is rounded to 3. According to the charge described in item 1 of the scope of the patent application; servo-type control to f-molding, method '* Medium-strengthening processing mechanism; Interval, wave equation, or other control system Turner. For Page 12