CN102069577B - Precision plastic injection system and control method thereof - Google Patents
Precision plastic injection system and control method thereof Download PDFInfo
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- CN102069577B CN102069577B CN201010558032.5A CN201010558032A CN102069577B CN 102069577 B CN102069577 B CN 102069577B CN 201010558032 A CN201010558032 A CN 201010558032A CN 102069577 B CN102069577 B CN 102069577B
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Abstract
The invention relates to a precision plastic injection system and a control method thereof. The system comprises a controller, a plastic injection hydraulic oil circuit, a plastic injection mold, and a plastic injection machine body, wherein the controller comprises a dynamic storage unit; a pressure sensor is arranged on a plastic oil cylinder or nozzle; the pressure sensor is connected with the controller; a position detector is arranged on the travel of a plastic injection screw, and a stop valve is arranged on the nozzle or a hot runner; the front end of the plastic injection screw is provided with a check valve; and the pressure sensor, the signal output end of the position detector and the control signal of the check valve are all connected with the controller. In the invention, the length of the operation travel of a plastic injection mold and the plastic injection total length from a zero point to the point where the plastic injection action is finished and where pressure-keeping is to be performed are set according to a position detector absolute position increasing mode. The system and the method realize accurate control over all travels, equalize the distances corresponding to the travels in the repeating processes of the travels, and enable different kinds of plastic liquid for plastic injection to have the same characteristics.
Description
Technical field
The present invention relates to a kind of injection machine, especially relate to a kind of control system of injection machine.
Background technology
General controller of plastic injection molding is set and all be take the ejaculation screw rod of injection machine and reach the limit of position as zero point carrying out injection mo(u)lding condition, and using position detector, record Yu Songtui completing place, storing completing place as penetrating starting position, set each pressure of each section of ejaculation or/and the change of speed simultaneously, and the switching position of this change, and penetrate the switching position of cutting pressurize.And setting is all carried out with the absolute position of above-mentioned position detector in these positions.In the running of actual ejection formation, often because the relation of raw material or ejaculation screw rod, material pipe, the design of non-return mechanism and the relation of mismachining tolerance, cause each ejaculation while moving cannot guarantee that check (non-return) valve completes the position repeatability of cutting out, that is to say the front and back change of non-return completing place, by causing, in each switching position, cannot guarantee that the liquid plastic of same volume (weight) injects in die cavity, this variation will be also the principal element of each product quality variation.If changed storing completing place between producing in addition, the switching position of each corresponding ejaculation section also will be usingd identical variable value as modification, just can guarantee the identical quality of production, in the process of quick fully-automatic production, this establishing method, its precision will more be difficult to be protected.But the control method of this mode has but generally been applied decades at Injection Industry.
In order to improve the accuracy of injection machine injection moulding Stroke Control, people have also carried out many effort in every respect, the Chinese patent that is CN2673623 as publication number discloses a kind of injection moulding machine stroke controller, it mainly comprises controller body and photoelectric sensor, described photoelectric sensor is mainly comprised of optical coupled switch and reflex activity plate, and reflex activity plate is provided with stroke connector.In controller body, can be provided with the optical coupled switch of determining number, the switching signal output of optical coupled switch is connected in the switching signal input control end in injection machine trip control circuit, in order to make stroke connector can freely drive reflex activity plate to move in controller body, reflex activity plate can be located on the chute fixing with controller body, and can establish rolling bearing between reflex activity plate and chute.This injection moulding machine stroke controller, has identical distribution with original line program switch, can directly be connected with the control device of existing injection machine.Publication number is the controller of plastic injection molding that the Chinese patent of CN201520044U discloses a kind of full automatic high efficiency, mainly by three CPU and a plurality of control module, formed, three CPU are connected together and are coordinated to carry out data communication by I2C bus, the one CPU expands by spi bus and I/O, I/O scanning and man-machine interface are carried out exchanges data, the 2nd CPU completes exchanges data by 485 communication interfaces and pressure control module and position control module, the 2nd CPU is by data wire and the direct swap data of flow-control module, the 3rd CPU is by spi bus and temperature control modules, DO control module and remote monitoring module carry out exchanges data.
But these technical schemes are all to improve in concrete stroke detection, transfer of data, penetrate each stroke of screw rod and still continued to use the set-up mode of existing absolute position, therefore, it is because the error that the set-up mode of absolute position brings cannot be eliminated, and this error exists always.
Summary of the invention
The present invention solves that the error of each stroke of the existing injection machine of prior art is large, the correction of error difficulty, provide a kind of and can accurately control each stroke, make each stroke in repetitive process, the distance of each corresponding stroke is identical, and also identical precision plastic injection system and control method thereof of the plastic liquid of injection moulding.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of precision plastic injection system, comprise controller, injection hydraulic oil circuit, injection mold, injection machine body, it is characterized in that described controller comprises a dynamic storage cell, injection moulding oil cylinder or nozzle are provided with pressure inductor, this pressure inductor is connected with described controller, the stroke of injection screw is provided with position detector, nozzle or hot runner are provided with stop valve, injection screw front end is provided with check (non-return) valve, described pressure inductor, the signal output part of position detector is all connected with described controller with the control signal of stop valve.The present invention in use, first determine and close the stop valve on nozzle or hot runner, start one section and preset the comparatively injection moulding action of low pressure low speed, allow the check (non-return) valve of screw in injection molding machine front end close completely, and set up and stablize and each identical precompressed, while allowing the raw material of each injection molded start, pressure is identical with density, pressure in pressure sensor senses to this setting, determine that again injection screw does not move forward again within the of short duration time, the check (non-return) valve that represents injection screw front end cuts out completely, and its front end has been set up at every turn after all identical liquid plastic pressure and density, simultaneously this set positions for making zero and being injection moulding original position, open fast the stop valve on nozzle or hot runner, from then on start according to the pressure of each section and speed and the relative distance of advancing as switching, carry out multistage injection molded, injection screw arrives injection moulding and has moved the injection moulding total length namely during pressurize switching point that will switch to pressurize, the pressurize action setting again, so just can guarantee that the injection moulding of each section all can fill the liquid material of identical volume and pressure, obtain injection molded the most accurate and that repeatability is the highest.
As preferably, described stop valve is provided with a control device, and the control circuit of this control device is connected with described controller.The switching of stop valve drives this control device by controller, makes the control of stop valve can reach accurate, timely, convenient, reliable requirement.
As preferably, described position detector is the revolution wave emitter that potential ruler or electronic ruler or optical ruler or position detect.And the position that computer control generally reads is called absolute position, treat that pressure inductor sensing reaches the pressure presetting, after determining that again injection screw does not move forward again within the of short duration time, controller carries out flyback action, also just set up relative position zero point, this relative position is stored in dynamic storage cell zero point, and as the dead-center position of each stroke of single injection process, namely penetrates starting position.Its performed each section penetrates action, accurately calculates forward stroke, and does to switch by setpoint distance, in full accord to guarantee the filling material quantity of each section of ejaculation.
In order to realize the control of above-mentioned a kind of precision plastic injection system, and realize accurate, automatic, reliable injection moulding process, the present invention also provides a kind of control method of precision plastic injection system, it is characterized in that it comprises the steps:
The first step, controller is set and is treated injection pressure, dwell pressure, and set Zhi Liao mechanism closed position, storing completing place, pine and move back completing place, to take that injection screw advances to be zero point to each location point foremost above, according to the cumulative mode in position detector absolute position, set, set the actuating length length of each injection moulding section simultaneously, moved and will switch to the injection moulding total length of pressurize with injection moulding, these haul distances be take injection moulding starting point and are started at zero point as relative position;
Second step, closes the stop valve on nozzle or hot runner, and controller is controlled injection hydraulic oil circuit, and injection screw rotation storing is retreated gradually, carries out storing operation;
The 3rd step, stops the rotation of injection screw immediately when position detector records when injection screw arrives storing completing place, and carries out loose deactuate do arrival pine and move back completing place;
The 4th step, when position detector records, penetrate screw rod by storing completing place and arrive pine while moving back completing place, close check (non-return) valve, the injection pressure for the treatment of whether controller reaches setting by the pressure that judges pressure inductor and record judges whether penetrate screw rod arrives pine and move back completing place;
The 5th step, mould closes mould, and the stop valve on nozzle or hot runner is closed in confirmation, controlling ejaculation screw rod advances slowly, with Time Controller, continue to judge whether pressure that pressure inductor records reaches treats injection pressure, when reaching this until injection pressure, determine that again injection screw does not move forward again within the of short duration time, the check (non-return) valve that represents injection screw front end cuts out completely, and its front end has been set up at every turn all identical liquid plastic pressure and density, the position of injection screw is now relative position zero point, and this positional information is temporary in to dynamic storage cell,
The 6th step, opens the stop valve on nozzle or hot runner fast, the multistage injection moulding work setting, and controller, according to each injection moulding section stroke arranging in advance, to start at the zero point of relative position, is controlled pressure and the speed of each section of promotion injection screw;
The 7th step, when penetrating screw rod, arrive injection moulding and moved the injection moulding total length namely during pressurize switching point that will switch to pressurize, injection screw keeps the dwell pressure of setting by hydraulic thrust, then carry out the same loop action of general injection mo(u)lding, until single injection work completes, then by the work of controller circulation second step to the seven steps, carry out continuous injection moulding work.
The beneficial effect bringing of the present invention is, the error of each stroke that solved the existing injection machine of prior art is large, the correction difficulty of error, realized and a kind ofly can accurately control each stroke, make each stroke in repetitive process, the distance of corresponding each identical stroke is identical, and also identical precision plastic injection system and control method thereof of the plastic liquid of injection moulding.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of control system of the present invention.
The specific embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: the present invention is a kind of precision plastic injection system and control method thereof, this precision plastic injection system comprises controller, injection hydraulic oil circuit, injection mold, injection machine body, described controller comprises a dynamic storage cell, injection moulding oil cylinder or nozzle are provided with pressure inductor, this pressure inductor is connected with described controller, the stroke of injection screw is provided with position detecting device, nozzle or hot runner are provided with stop valve, described stop valve is provided with a control device, and the control circuit of this control device is connected with described controller.Injection screw front end is provided with check (non-return) valve, and described pressure inductor, the signal output part of position detecting device are connected with described controller.
A control method for precision plastic injection system, is characterized in that it comprises the steps:
The first step, controller is set and is treated injection pressure, dwell pressure, and set Zhi Liao mechanism closed position, storing completing place, pine and move back completing place, to take that injection screw advances to be zero point to each location point foremost above, according to the cumulative mode in position detector absolute position, set, set the actuating length length of each injection moulding section simultaneously, moved and will switch to the injection moulding total length of pressurize with injection moulding, these haul distances be take injection moulding starting point and are started at zero point as relative position;
Second step, closes the stop valve on nozzle or hot runner, and controller is controlled injection hydraulic oil circuit, and injection screw rotation storing is retreated gradually, carries out storing operation;
The 3rd step, stops the rotation of injection screw immediately when position detector records when injection screw arrives storing completing place, and carries out loose deactuate do arrival pine and move back completing place;
The 4th step, when position detector records, penetrate screw rod by storing completing place and arrive pine while moving back completing place, close check (non-return) valve, the injection pressure for the treatment of whether controller reaches setting by the pressure that judges pressure inductor and record judges whether penetrate screw rod arrives pine and move back completing place;
The 5th step, mould closes mould, and the stop valve on nozzle or hot runner is closed in confirmation, controlling ejaculation screw rod advances slowly, with Time Controller, continue to judge whether pressure that pressure inductor records reaches treats injection pressure, when reaching this until injection pressure, determine that again injection screw does not move forward again within the of short duration time, the check (non-return) valve that represents injection screw front end cuts out completely, and its front end has been set up at every turn all identical liquid plastic pressure and density, the position of injection screw is now relative position zero point, and this positional information is temporary in to dynamic storage cell,
The 6th step, opens the stop valve on nozzle or hot runner fast, the multistage injection moulding work setting, and controller, according to each injection moulding section stroke arranging in advance, to start at the zero point of relative position, is controlled pressure and the speed of each section of promotion injection screw;
The 7th step, when penetrating screw rod, arrive injection moulding and moved the injection moulding total length namely during pressurize switching point that will switch to pressurize, injection screw keeps the dwell pressure of setting by hydraulic thrust, then carry out the same loop action of general injection mo(u)lding, until single injection work completes, then by the work of controller circulation second step to the seven steps, carry out continuous injection moulding work.
Before carrying out injection operation, injection machine must first close the stop valve on nozzle or hot runner, set up each time at a slow speed all the pressure of identical liquid plastics to be penetrated and density, when the check (non-return) valve of injection screw front end cuts out completely, at short notice, when injection screw does not move, open again stop valve, start injection moulding and allow plastics enter die cavity, the precision range with position detector judgement injection screw to each section of ejaculation, so can obtain the most accurately and the injection mo(u)lding of high duplication.
So having, the present invention can accurately control each stroke, make each stroke in repetitive process, the distance of each corresponding stroke is identical, and the density of the plastic liquid of injection moulding and volume be equal feature mutually also, effectively adapted to high-accuracy, quick, the injection moulding requirement such as repeat, solved in decades the error chronic illness of injection machine in height repeats.
Claims (1)
1. a control method for precision plastic injection system, is characterized in that it comprises the steps:
The first step, controller is set and is treated injection pressure, dwell pressure, and set Zhi Liao mechanism closed position, storing completing place, pine and move back completing place, to take that injection screw advances to be zero point to each location point foremost above, according to the cumulative mode in position detector absolute position, set, set the actuating length length of each injection moulding section simultaneously, moved and will switch to the injection moulding total length of pressurize with injection moulding, these haul distances be take injection moulding starting point and are started at zero point as relative position;
Second step, closes the stop valve on nozzle or hot runner, and controller is controlled injection hydraulic oil circuit, and injection screw rotation storing is retreated gradually, carries out storing operation;
The 3rd step, stops the rotation of injection screw immediately when position detector records when injection screw arrives storing completing place, and carries out loose deactuate do arrival pine and move back completing place;
The 4th step, when position detector records, penetrate screw rod by storing completing place and arrive pine while moving back completing place, close the check (non-return) valve that is located at injection screw front end, controller is arranged on by judgement the injection pressure for the treatment of whether pressure that the pressure inductor on injection moulding oil cylinder or nozzle records reach setting and judges whether penetrate screw rod arrives pine and move back completing place;
The 5th step, mould closes mould, and the stop valve on nozzle or hot runner is closed in confirmation, controlling ejaculation screw rod advances slowly, with Time Controller, continue to judge whether pressure that pressure inductor records reaches treats injection pressure, when reaching this until injection pressure, determine that again injection screw does not move forward again within the of short duration time, the check (non-return) valve that represents injection screw front end cuts out completely, and its front end has been set up at every turn all identical liquid plastic pressure and density, the position of injection screw is now relative position zero point, and this positional information is temporary in to dynamic storage cell,
The 6th step, opens the stop valve on nozzle or hot runner fast, the multistage injection moulding work setting, and controller, according to each injection moulding section stroke arranging in advance, to start at the zero point of relative position, is controlled pressure and the speed of each section of promotion injection screw;
The 7th step, when penetrating screw rod, arrive injection moulding and moved the injection moulding total length namely during pressurize switching point that will switch to pressurize, injection screw keeps the dwell pressure of setting by hydraulic thrust, then carry out the same loop action of general injection mo(u)lding, until single injection work completes, then by the work of controller circulation second step to the seven steps, carry out continuous injection moulding work.
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| CN201010558032.5A CN102069577B (en) | 2010-11-25 | 2010-11-25 | Precision plastic injection system and control method thereof |
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| CN201010558032.5A CN102069577B (en) | 2010-11-25 | 2010-11-25 | Precision plastic injection system and control method thereof |
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| CN104535309B (en) * | 2014-12-17 | 2017-07-11 | 海天塑机集团有限公司 | The method of testing of injection screw check ring response time |
| JP6444955B2 (en) | 2016-09-23 | 2018-12-26 | ファナック株式会社 | Injection molding system, injection molding machine and peripheral device |
| CN111605154B (en) * | 2020-04-26 | 2022-05-17 | 英格斯模具制造（中国）有限公司 | Control method for hot runner pressure maintaining in injection molding and injection molding system |
| CN112571745B (en) * | 2020-11-19 | 2022-11-22 | 青岛歌尔微电子研究院有限公司 | Pressure control method and injection molding equipment |
| CN115139479B (en) * | 2021-03-30 | 2023-06-02 | 震雄机械（深圳）有限公司 | Injection molding machine control method and injection molding machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906009A (en) * | 2004-01-23 | 2007-01-31 | 赫斯基注射器成型系统有限公司 | Injection molding method and apparatus for continuous plastication |
| CN201950793U (en) * | 2010-11-25 | 2011-08-31 | 宁波弘讯科技有限公司 | Injection machine control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906009A (en) * | 2004-01-23 | 2007-01-31 | 赫斯基注射器成型系统有限公司 | Injection molding method and apparatus for continuous plastication |
| CN201950793U (en) * | 2010-11-25 | 2011-08-31 | 宁波弘讯科技有限公司 | Injection machine control system |
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