CN102642286A - Fully-electric ultra-high speed injection molding PVT (Pressure Volume Temperature) online measurement and control method - Google Patents
Fully-electric ultra-high speed injection molding PVT (Pressure Volume Temperature) online measurement and control method Download PDFInfo
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- CN102642286A CN102642286A CN2012101548353A CN201210154835A CN102642286A CN 102642286 A CN102642286 A CN 102642286A CN 2012101548353 A CN2012101548353 A CN 2012101548353A CN 201210154835 A CN201210154835 A CN 201210154835A CN 102642286 A CN102642286 A CN 102642286A
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Abstract
The invention discloses a fully-electric ultra-high speed injection molding PVT (Pressure Volume Temperature) online measurement and control method. By using a melt metered through plasticization in a cylinder as an object, a thermodynamic state (P0, T0, V0) of a highly-compressed melt before injection as a control starting point and the thermodynamic state (P1, T1, V1) of the melt in the cylinder after injection molding as a control ending point, through online detection of a PVT relation characteristic of a polymer in an ultra-high speed injection molding process, by depending on a high-pressure control system and a high-response executing mechanism of a fully-electric ultra-high speed injection molding machine and using the PVT relation characteristic of the ultra-high speed injection molded polymer as the guidance, precision control of ultra-high speed injection molding is realized. The fully-electric ultra-high speed injection molding PVT online measurement and control method has the advantages of high control precision and high cost performance.
Description
Technical field
The present invention relates to a kind of ultrahigh speed injection mo(u)lding investigating method, belong to macromolecular material processing and forming field.
Background technology
An urgent demand of " ultralight, ultra-thin, ultraprecise " to fields such as space flight and aviation, biomedical engineering and consumer electronics injection moulded products has been proposed; Conventional injection mo(u)lding can't be satisfied the moulding requirement, and the ultrahigh speed injection mo(u)lding is widely used in the production of thin-walled precise injection molding goods such as LGP, micro-fluidic chip.The ultrahigh speed injection mo(u)lding requires injection molding apparatus that the injection speed and the higher injection pressure of superelevation can be provided, and plasticizing quality is stable, and control accuracy height and controlled range are wide.It is stable to require injection machine in whole forming process, to show in addition.
In general, the ultrahigh speed injection mo(u)lding the utmost point realize in the short time screw rod speed-raising, injection speed reach 800mm/sec or more than, be tens times of normal injection speed.Ultrahigh speed injection moulded products wall thickness can reach below the 0.1mm, and the ratio of length of flow/wall thickness is up to 400:1, and the goods required precision is very high, has only the precision injection molding equipment of cooperation and technology could satisfy the moulding requirement.
In the ultrahigh speed injection molding process; Polymer melt is expelled in the mold cavity with the fltting speed more than the 800mm/sec by injection screw; thin-wall construction makes plastic products surpass 120 ℃/ excessive temperature gradient cooling and shaping s more than, during the violent variations of complicacy such as the cataclysm of polymer experience pressure, ultra-high shear and ultra-high temperature gradient.In addition; Because the viscous-elastic behaviour of high-molecular organic material; The melt high pressure that is produced during the screw rod propelled at high velocity at first is that the anterior high-temperature fusant of screw rod is implemented high compression, and the kinetic energy overwhelming majority that screw rod transmitted of propelled at high velocity all is converted into the inner potential energy of melt.Can know that according to material PVT characteristic curve when the melt external pressure was increased to the 230MPa high pressure by back pressure pressure moment in when plasticizing, the compressible ratio of melt can reach 10%.Therefore, the ultrahigh speed injection mo(u)lding is different from conventional injection mo(u)lding, and forming process needs strict process control.But; How complicated and fierce these change procedures no matter polymeric material experienced are; All the time follow the PVT characteristic relation corresponding between the P of melt, the temperature T in the specific volume V of polymer and the process with material, promptly V=f (P, T); This is the base attribute of material, also is the scientific basic of molded, shaped articles precision control.
At present, domestic and international research for polymer P VT relation property mainly concentrates on measuring technology and application facet thereof.Conventional PVT test philosophy comprises that mainly plunger-sleeve pressurization and sealing liquid pressurize two kinds.Wherein, be that the testing equipment of representative is respectively the SWO-PVT100 tester of Germany and the PVT tester of U.S. Gnomix company with it.Yet; These polymeric material tests all need be carried out under given conditions, though can obtain the PVT relation of polymeric material, for processing and forming; The extreme processing conditions of especially similar ultrahigh speed injection mo(u)lding, conventional PVT method of testing can't provide the accurate guidance data for moulding.
Obtain process is had the polymeric material PVT relation property of accurate directive significance, must set up the test condition consistent with actual forming process.Patent 200710063461.3 discloses a kind of method and device of on-line testing polymer pressure-specific volume-temperature relation.The PVT relation that this testing arrangement records can reflect the PVT relation under the molded process conditions of actual bets more realistically.In addition, can concern mould design and the cae analysis that instructs the injection-mold process parameter of formulating polymer product or be used for goods with the polymer P VT of on-line testing.
Though method of testing of today can be created the test condition consistent with common injection mo(u)lding with device; Still exist than big difference but compare with the processing conditions that is produced in the ultrahigh speed injection molding process, thus obtained PVT characteristic test result can't accurate description with instruct actual molding process.
Summary of the invention
The present invention is through the PVT relation property of polymer in the online detection ultrahigh speed injection moulding process; Rely on the high-precision control system and the high executing agency that responds of all-electric ultrahigh speed injection machine; With ultrahigh speed injection mo(u)lding polymer P VT relation property is guidance, realizes the precision control of ultrahigh speed injection mo(u)lding.The objective of the invention is to solve the forming defect that causes because of polymer melt generation acute variation in the ultrahigh speed injection molding process, the all-electric ultrahigh speed injection mo(u)lding PVT online monitoring method method of a kind of high control accuracy, high performance-price ratio is provided for this reason.
For realizing above-mentioned purpose; The present invention adopts following technical scheme: the online PVT investigating method of all-electric ultrahigh speed injection mo(u)lding; On the nozzle of full electric injection molding machine and on the mold cavity temperature sensors of high precision, high-precision pressure sensor are being installed; Plasticizing apparatus at full electric injection molding machine is equipped with high accuracy displacement sensor; The signal that is recorded by these sensors is passed to PVT dynamic parameter acquisition system after amplifying, PVT dynamic parameter acquisition system is controlled the servo drive system that the temperature and the control screw rod of machine barrel in the plasticizing apparatus rotates and move through PVT control system; Temperature sensors of high precision be arranged in respectively in the injection mold with machine barrel in, record the temperature of melt by being arranged in temperature sensors of high precision in the mold cavity, record the temperature of screw head melt by being arranged in temperature sensors of high precision in the machine barrel; High-precision pressure sensor be arranged in respectively in the injection mold with machine barrel in, record the pressure of melt by being arranged in high-precision pressure sensor in the mold cavity, record the pressure of screw head melt by being arranged in high-precision pressure sensor in the machine barrel; It is terminal that high accuracy displacement sensor is placed on the injection device screw rod, measures the terminal displacement of screw rod; PVT dynamic parameter acquisition system changes into data signal to the analog signal of sensor acquisition, and depicts polymer melt PVT change curve in the injection molding process according to the PVT state equation; PVT control system carries out the logical operation of " PVT relation " according to the PVT data that the dynamic parameter acquisition system provides; Moulding process requirement according to the ultrahigh speed injection mo(u)lding; All-electric ultrahigh speed injection machine servo drive system is sent action command; Realization is instructed the moulding of " ultralight, ultra-thin, ultraprecise " plastic products based on the ultrahigh speed injection mo(u)lding On-line Control of PVT relation.
The basic principle of all-electric ultrahigh speed injection mo(u)lding PVT online monitoring method method of the present invention is: the melt with after the plasticizing metering in the machine barrel is an object, with the melt thermodynamic state (P of high compression before the injection
0, T
0, V
0) as the control starting point, melt thermodynamic state (P in the machine barrel after the injection mo(u)lding
1, T
1, V
1) as the control end point.At this moment, melt has got into and has accomplished product molding process, its pressure P in the mould
mAnd temperature T
mCan be considered known quantity (pressure and temperature during the goods demoulding), the specific volume V of decision shaped article quality
mThen become final control target.Pressure P, temperature T can be directly by the reflections of melt actual parameter, and specific volume V then controls through screw position indirectly.Feed back to the logical operation that PVT control system carries out " PVT relation " through temperature, pressure and screw position pilot signal, result of calculation is passed through the full electric injection molding machine servo drive system to forming process pressure (P
0, P
1) and screw position (V
0, V
1) carry out accuracy controlling, thus reach the specific volume V of control goods
mPurpose, realize the online monitoring method of the precision injection molding of goods.
All-electric ultrahigh speed injection mo(u)lding PVT online monitoring method method of the present invention, high-precision temperature, pressure and displacement transducer have fast-response, can detect the variable signal of temperature, pressure and displacement at the utmost point in the short time.Through polymer melt PVT relation in the online detection ultrahigh speed injection molding process, obtain real-time polymer melt PVT data.
PVT of the present invention controls system; Temperature, pressure and screw position signal with the collection of PVT dynamic parameter acquisition system are the control object; PVT relation with polymeric material is the control basis; Final mass with moulded products is the control purpose, accomplishes the setting of injection molding parameter and carries out dynamically adjustment through the servo drive system of all-electric ultrahigh speed injection machine.Like crucial molding parameters such as melt temperature, injection speed, injection pressure, mold temperatures.
All-electric ultrahigh speed injection mo(u)lding PVT online monitoring method method of the present invention; The temperature of polymer melt and pressure testing and controlling point also can be a plurality of; Through PVT dynamic parameter acquisition system collecting temperature and pressure signal, realize the precision control of ultrahigh speed injection mo(u)lding through PVT control system.
A kind of all-electric ultrahigh speed injection mo(u)lding PVT online monitoring method method of the present invention; Compared with prior art; Variation relation through polymer P VT in the monitoring forming process; Solved the caused polymer glass glass transistion of complicated processing conditions such as pressure cataclysm in the ultrahigh speed injection mo(u)lding, high shear and high-temperature gradient, crystallization and orientation etc. and changed uncertain influence, and the ultrahigh speed injection mo(u)lding precision control method of a kind of high control accuracy, high performance-price ratio is provided shaped article quality.
Description of drawings
Fig. 1 is the testing scheme sketch map of the all-electric ultrahigh speed injection mo(u)lding of the present invention PVT online monitoring method method.
Fig. 2 is the all-electric ultrahigh speed injection mo(u)lding of a present invention PVT online monitoring method method control principle sketch map.The position of melt and screw rod when last figure expression plasticizing finishes, middle figure representes to compress at a high speed when initial the state of melt in the nozzle, figure below be accomplish injection be in the mould with the pressure-specific volume of the interior melt of nozzle-and temperature.
Fig. 3 is the all-electric ultrahigh speed injection mo(u)lding of a present invention PVT online monitoring method method control scheme schematic block diagram.
Among the figure: 1-injection mold, 2-mould temperature sensors of high precision, 3-mould high-precision pressure sensor, 4-machine barrel temperature sensors of high precision, 5-machine barrel high-precision pressure sensor, 6-machine barrel, 7-injecting systems, 8-injection screw, 9-displacement transducer, 10-frame
The specific embodiment
As shown in Figure 1, the testing scheme of the all-electric ultrahigh speed injection mo(u)lding of the present invention PVT online monitoring method method, mainly by injection mold 1, injecting systems 7 is formed with frame 10; Mould temperature sensors of high precision 2 is installed in the die cavity of injection mold 1 with mould high-precision pressure sensor 3, detects the temperature and pressure in the die cavity; Machine barrel temperature sensors of high precision 4 is installed on machine barrel 6 front ends with machine barrel high-precision sensor 5, detects the temperature and pressure of barrel head melt; Displacement transducer 9 is arranged on injection screw 8 ends, detects screw position.
As shown in Figure 2, the all-electric ultrahigh speed injection mo(u)lding of the present invention PVT online monitoring method method control principle is to be object with the melt after the plasticizing metering in the machine barrel, with the melt thermodynamic state (P of high compression before the injection
0, T
0, V
0) as the control starting point, melt thermodynamic state (P in the machine barrel after the injection mo(u)lding
1, T
1, V
1) as the control end point.When plasticizing finished, screw head had stored high-temperature fusant.When injection signal sent, because the viscous-elastic behaviour of polymer and the high response characteristic of servo-drive system, screw rod is injection forward rapidly, and screw head polymer melt moment is compressed at a high speed, defines melt thermodynamic state (P this moment
0, T
0, V
0).After this, the melt high pressure discharges and follows screw of injection to get into and accomplish product molding process, its pressure P in the mould
mAnd temperature T
mCan be considered known quantity (pressure and temperature during the goods demoulding), the specific volume V of decision shaped article quality
mThen become final control target.Pressure P, temperature T can be directly by the reflections of melt actual parameter, and specific volume V then controls through screw position indirectly.Feed back to the logical operation that PVT control system carries out " PVT relation " through temperature, pressure and screw position pilot signal, result of calculation is passed through the full electric injection molding machine servo drive system to forming process pressure (P
0, P
1) and screw position (V
0, V
1) carry out accuracy controlling, thus reach the specific volume V of control goods
mPurpose, realize the precision injection molding of thin-gage goods.
Shown in Fig. 3; After the detected signal of temperature, pressure sensor and displacement transducer in die cavity and the machine barrel is handled through amplifier; Be input in the PVT dynamic parameter acquisition system, temperature, pressure and displacement data that PVT dynamic parameter acquisition system will be gathered gained are transferred in the PVT control system.PVT control system controls plasticizing motor and injecting motor through servo-drive system according to the PVT relation property of forming polymer and the requirement of moulding process, through the heating circle machine barrel melt temperature is controlled.
PVT controls system; Requirement according to the ultrahigh speed injection mo(u)lding; Needs according to product forming process; With polymer P VT relation property is the control basis, and the deviation that temperature, pressure and the screw position signal that contrast PVT dynamic parameter acquisition system is gathered requires with moulding realizes the precision control of crucial molding parameters such as melt temperature, injection speed, injection pressure, mold temperature through the servo drive system of all-electric ultrahigh speed injection machine; The final purpose that realizes the thin-gage goods precise forming, this process are used to guarantee to inject the precision control with pressure maintaining period.
The measuring control point of temperature, pressure also can be a plurality of, through PVT dynamic parameter acquisition system collecting temperature and pressure signal, realizes the precision control of ultrahigh speed injection mo(u)lding through PVT control system.Multi-spot measurement and control can promote the accuracy of detection of temperature, pressure, helps improving the precision of all-electric ultrahigh speed injection mo(u)lding PVT On-line Control, but cost can corresponding raising.
Claims (1)
1. all-electric ultrahigh speed injection mo(u)lding PVT online monitoring method method; On the nozzle of full electric injection molding machine and on the mold cavity temperature sensors of high precision, high-precision pressure sensor are being installed; Plasticizing apparatus at full electric injection molding machine is equipped with high accuracy displacement sensor; Signal by these sensors record is passed to PVT dynamic parameter acquisition system after amplifying; PVT dynamic parameter acquisition system changes into data signal to the analog signal of sensor acquisition, and depicts polymer melt PVT change curve in the injection molding process according to the PVT state equation; PVT control system carries out the logical operation of " PVT relation " according to the PVT data that the dynamic parameter acquisition system provides; Moulding process requirement according to the ultrahigh speed injection mo(u)lding; All-electric ultrahigh speed injection machine servo drive system is sent action command; Realization is characterized in that based on the ultrahigh speed injection mo(u)lding On-line Control of PVT relation: the melt with after the plasticizing metering in the machine barrel is an object, with the melt thermodynamic state (P of high compression before the injection
0, T
0, V
0) as the control starting point, melt thermodynamic state (P in the machine barrel after the injection mo(u)lding
1, T
1, V
1) as the control end point, melt has got into and accomplished product molding process, its pressure P in the mould
mAnd temperature T
mCan be considered known quantity, the specific volume V of decision shaped article quality
mThen become final control target, feed back to the logical operation that PVT control system carries out " PVT relation " through temperature, pressure and screw position pilot signal, result of calculation is passed through the full electric injection molding machine servo drive system to forming process pressure (P
0, P
1) and screw position (V
0, V
1) carry out accuracy controlling, thus reach the specific volume V of control goods
mPurpose, realize the online monitoring method of the precision injection molding of goods.
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| CN103481478A (en) * | 2013-10-08 | 2014-01-01 | 广州创维平面显示科技有限公司 | Injection mold |
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| CN103722655A (en) * | 2013-05-27 | 2014-04-16 | 昆山德安模具设计有限公司 | Intelligent injection molding machine |
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| CN104552854A (en) * | 2014-12-18 | 2015-04-29 | 海天塑机集团有限公司 | Test method of melt reverse flow in injection molding |
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| CN104552854A (en) * | 2014-12-18 | 2015-04-29 | 海天塑机集团有限公司 | Test method of melt reverse flow in injection molding |
| CN106003611A (en) * | 2016-06-23 | 2016-10-12 | 安徽金帅洗衣机有限公司 | Washing machine shell injection molding material forming device |
| CN106003611B (en) * | 2016-06-23 | 2017-11-28 | 安徽金帅洗衣机有限公司 | A kind of washing machine shell injection material shaped device |
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| CN106863731A (en) * | 2017-03-29 | 2017-06-20 | 北京化工大学 | A kind of injection-molded item defect self-cure regulation and control device and method |
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| CN110658071A (en) * | 2019-10-09 | 2020-01-07 | 北京化工大学 | Device and method for dynamically testing light polymerization molding shrinkage evolution |
| CN110658071B (en) * | 2019-10-09 | 2020-06-26 | 北京化工大学 | Device and method for dynamically testing light polymerization molding shrinkage evolution |
| CN110614756A (en) * | 2019-10-24 | 2019-12-27 | 周桃英 | Intelligent control's notes material machine |
| CN111391260A (en) * | 2020-03-21 | 2020-07-10 | 吴学涛 | Temperature control system of injection molding machine |
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| WO2021243779A1 (en) * | 2020-06-01 | 2021-12-09 | 海天塑机集团有限公司 | Injection molding self-adaptive compensation method based on melt viscosity fluctuation |
| US11772313B2 (en) | 2020-06-01 | 2023-10-03 | Haitian Plastics Machinery Group Co., Ltd | Injection molding adaptive compensation method based on melt viscosity fluctuation |
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Application publication date: 20120822 |