CN100482444C - Controller of injection molding machine - Google Patents
Controller of injection molding machine Download PDFInfo
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- CN100482444C CN100482444C CNB2007100787040A CN200710078704A CN100482444C CN 100482444 C CN100482444 C CN 100482444C CN B2007100787040 A CNB2007100787040 A CN B2007100787040A CN 200710078704 A CN200710078704 A CN 200710078704A CN 100482444 C CN100482444 C CN 100482444C
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Abstract
A control pillar of injection molding machine, which can diminish the increase of cycle time while the screw rod is falling back after be measured, more accuracy and unity numerical magnitude can be obtained, and the condition of measurement can be determined in a short time. After the measuring, screw rod stop circumgyrate and fall back by the first velocity V1. In the enactment zone, the screw rod reverse rotation by the preset velocity Rv. Then, screw rod fall back at he second velocity V2 which is lower than the first velocity V1, While stopped in the reverse rotation zone, screw rod stop circumgyrate and fall back to the enactment stop position by the third velocity V3. Therefore, compared to the circs of screw rod fall back and reverse rotation, cycle time can be shorten. When the screw rod reverse rotation the fall back speed of screw rod is low, which can inhibit the sudden change of drang. as a consequence of adjust the conditional of screw rod reverse rotation and retrogressive autocephaly, it can be adjust to optimum conditions in a short time.
Description
Technical field
The present invention relates to a kind of injection (mo(u)lding) machine, relate in particular to a kind of controller of injection (mo(u)lding) machine of accurate measurement resin.
Background technology
In spiral direct-injection type injection (mo(u)lding) machine, thereby the screw rod in the rotation heating cylinder melts and moulds resin material, then the resin of fusing is fed into the end portion of heating cylinder under pressure.Then, screw rod retreats under pressure control.When screw rod reaches setting measurement point, just stop the rotation and retreat, measure amount of resin then.Equally, in pre-plasticising formula injection (mo(u)lding) machine, the resin that melts is fed into the barrel end portion, piston retreats under the pressure of injecting resin.When the piston arrives desired location, measure amount of resin.After measurement, screw rod or piston-advance and with the fusing resin injection and be filled in the mould.
In order to improve the quality of shaped article, need to reduce the dispersion that molten resin is filled in the mould.
When retreating into measurement point or position, screw rod or piston carry out injection.If directly with the molten resin injection of measuring and be filled in the mould, just can obtain to fill accurately after this, thereby so the product of moulding can not disperse its quality and can keep unified owing to weight.Yet, when measuring end back start injection process, exist the resin of fusing to reflux and the problem of the amount of resin that change is measured.
For example stick on the end of screw rod for the valve of check (non-return) valve or check ring, thereby screw rod is rotated the molten resin that produces is fed into barrel in measuring process end, be not expelled in the mould at injection process then with will having backflow at the molten resin of screw rod end portion.This valve prevents that molten resin from flowing between the end portion of screw rod and base portion, and finishes to change the amount of resin of measuring during the time cycle of start injection in measurement preventing.Therefore, can inject the amount of resin of measurement exactly.Yet the problem of existence is that the delay operation of the anti-locking apparatus of backflow (for example preventing the valve that molten resin refluxes) may cause the backflow of molten resin, thereby can not inject the molten resin of accurate amount.There are various technology can improve this problem.
According to known invention (JP2-147312A, in pre-plasticising formula injection (mo(u)lding) machine Fig. 1), piston retreats when measure finishing, thereby the pressure of the molten material of screw rod end portion is 0.Then, piston-advance retreats check (non-return) valve, thereby closes the resin channels from the barrel base portion to end portion.Therefore prevent the backflow of molten material, thereby got rid of the dispersion of measuring amount of resin.
In known spiral direct-injection type injection (mo(u)lding) machine, (see [0031] section of JP 11-240052A), when screw rod retreats into measurement point, stop the rotation.After screw rod stopped to retreat, screw rod was in its position-reversed that stops rotation, and the pressure of the resin at barrel rear portion reduces retreats check (non-return) valve, thereby closes resin channels.Then, resin is sucked back and start injection, thereby got rid of the dispersion of measuring amount of resin.
Under another known case, (see the claim 1 and 2 of JP 3118188B), the position in the resorption process after screw rod rests on and measure to finish during reverse rotation, start injection then.Under another known case, (see the invention effect of JP 2-38381B), after measure finishing in screw rod reverse rotation and retreating, start injection then.Under another known case, (see JP 9-29794B [0015], [0016], [0017 section]), measure and finish back screw rod reverse rotation after sucking back resin that check (non-return) valve cuts out resin channels.Then, screw rod advance to the resorption process before beginning the position and when temporarily stopping, carry out injection.Alternatively, screw rod advance to the resorption process before beginning the position and begin reverse rotation when after resin is sucked back, temporarily stopping after, carry out injection.Under another known case, (see the claim 1 and 2 of JP 60-76321A), thereby after measuring, carry out the accuracy that preform injection improves injection.In this preform injection, after measuring, will keep fixed time period, thereby this pressure is increased to fixed pressure than melting the oily lower pressure of pressure that is expelled in the container.After closing check ring, this position is stored in the memory, and the position of carrying out apart from storage is the injection of fixed range.Alternatively, contra rotating screw in preform injection.(seeing the claim of JP 53-39358A) under another known case, screw rod is simply exerted pressure it is advanced and stop at preposition measure finishing the back, is that reference point is carried out injection with this position then.Under another known case, (see the claim of JP 52-151352A), after measuring end, thereby screw rod is exerted pressure the mobile check (non-return) valve of fixed time period with the resin channels safety shutdown, screw rod stops at the position that arrives predetermined pressure, is that reference point is carried out injection with this position.
(see [0011] section of JP 3652681B) in another case, the surplus that will produce owing to excessive screw rod rotation after will measuring by reverse rotation is measured resin and is returned.(see [0011] section of JP2004-154994A) in another case, begin the reverse rotation of screw rod immediately after measuring end, screw rod stops at measures terminal position accurately.
According to above-mentioned prior art, prevented the barrel end portion molten resin backflow etc. and prevented from injection process, to change the amount of resin of measuring.
In the known control method that obtains accurate measurement amount of resin, (see that JP 1-26857B the 6th hurdle last 1 walks to the 7th hurdle the 21st row), a plurality of back pressure instruction collection and screw rod speed instruction set are provided, thereby can have controlled the combination of back pressure and screw rod speed with being relative to each other.In this case, by when measuring process finishes, screw rod speed and screw rod astern speed being controlled to be zero, make measurement unified.
In another known method, (seeing claim and Fig. 2 of JP 64-6931B) based on screw back position, obtains stable measurement amount of resin by reduce the screw rod rotary speed gradually before measurement stops.
In the pre-plasticising formula injection (mo(u)lding) machine that JP 2-147312A describes, after measuring end, piston retreats or advances.In the injection (mo(u)lding) machine that JP 11-240052A, JP 3118188B, JP 9-29794B and JP 3652681B describe, by with the reverse rotation of screw rod with measure advancing or retreating separately to carry out after finishing and obtain measuring amount (injection volume) accurately.Yet, inferior position based on the measurement of these prior aries operation is: compare with the pre-plasticising injection (mo(u)lding) machine (wherein piston neither advance also stand fast) or the measurement operation of conventional helical direct-injection type injection (mo(u)lding) machine (wherein not reverse rotation of screw rod), prolong its circulation timei inevitably.
According to the technology of describing among the JP 2-38381B, reverse rotation when wherein screw rod retreats after measuring end, in addition, although can't increase its cycle time, if the screw rod reverse rotation is a bit, the internal pressure of screw rod just reduces fully.Therefore, for precise forming must minimize the reverse rotation of screw rod, this may cause excessive reverse rotation.Yet,, just cause the dispersion of in next moulding circulation, measuring inevitably if contra rotating screw exceedingly can cause molten resin to reflux and excessively is filled in the groove of screw rod.Further, if shorten the backway of screw rod for the reverse rotation that reduces screw rod, then the decompression that retreats of screw rod is too little, so that causes the moulding instability from the nozzle drippage.Further, if the astern speed of the screw rod in the reverse rotation is too high, the pressure that the pressure of the measurement resin that the screw rod reverse rotation brings minimizing effect and screw rod retreat the measurement resin that brings reduces the effect collaborative work.So unexpected pressure change takes place, thereby the measuring amount of resin changes inevitably also.This has increased the dispersion or the minimal buffering amount of injection pressure, and its control is also very difficult.
Summary of the invention
The invention provides a kind of controller that is used for injection (mo(u)lding) machine, can be minimized in the increase of measuring the cycle time in the fallback procedures that finishes the back screw rod, the amount of resin of more accurate and unified measurement can be obtained, and measuring condition can be determined at short notice.
According to a first aspect of the invention, provide a kind of measuring method that is used for injection (mo(u)lding) machine, this injection (mo(u)lding) machine is the spiral direct-injection type injection (mo(u)lding) machine with rotatable and axially movable screw rod in barrel.This method comprises: measure thereby the resin before the screw rod of first direction rotary screw feeding in barrel carries out resin; Measure to finish the back with the direction of retreat opposite mobile screw axially at resin, thereby screw rod carries out backward movement with the direction of advance that is used for injecting resin; And, be rotated in screw rod in the backward movement with the second direction opposite with first direction, wherein, first speed of the backward movement of screw rod is not different with the second speed of the backward movement of screw rod when second direction is rotated when rotating.
According to a second aspect of the invention, a kind of measuring method that is used for injection (mo(u)lding) machine is provided, this injection (mo(u)lding) machine be have in first barrel rotatable screw rod with second barrel that this first barrel links to each other in the pre-plasticising formula injection (mo(u)lding) machine of the piston that can axially move.This method comprises: in first barrel screw rod is rotated up in first party, measure thereby the resin before the piston of feeding in second barrel carries out resin; Measure to finish the back with the direction of retreat opposite mobile piston axially at resin, thereby piston carries out backward movement with the direction of advance that is used for injecting resin; And, be rotated in screw rod in the backward movement with the second direction opposite with first direction, wherein, first speed of piston backward movement is not different with the second speed of screw rod backward movement of piston when second direction is rotated when screw rod rotates.
According to a third aspect of the invention we, a kind of controller that is used for injection (mo(u)lding) machine is provided, and this injection (mo(u)lding) machine is to have first motor that is used for rotary screw in barrel and be used in barrel the axially spiral direct-injection type injection (mo(u)lding) machine of second motor of mobile screw.This controller comprises: be used to drive first motor and come the resin of feeding before the barrel inner screw at the first direction rotary screw, and drive second motor be used to measure resin up to screw axial move to the device of default measurement end position; Be used to set screw rod and arrive the default distance of measuring the backward movement of screw rod behind the end position, and the device of first and second friction speeds of screw rod backward movement; And, thereby be used to drive second motor with screw axial move setting distance make screw rod after arriving the measurement end position of setting, carry out backward movement, and drive first motor and rotate up the device of the screw rod in the backward movement in the second party opposite with first direction, wherein, thereby drive second motor screw rod when screw rod does not rotate and carry out backward movement, and when screw rod screw rod second speed execution backward movement when second party rotates up to set with first speed of setting.
According to a forth aspect of the invention, a kind of controller that is used for injection (mo(u)lding) machine is provided, and this injection (mo(u)lding) machine is to have first motor of rotary screw in first barrel and be used in second barrel axially pre-plasticising formula injection (mo(u)lding) machine of second motor of mobile piston.This controller comprises: be used to drive the resin before first motor rotary screw on first direction comes the piston of feeding in second barrel, and drive second motor be used to measure resin axially moves to default measurement end position up to piston device; Be used to set the device of first and second friction speeds of the backward movement of the distance of backward movement of the default measurement end position back piston of piston arrives and piston; And, thereby being used to drive second motor makes piston carry out backward movement after arriving the measurement end position of setting the distance that piston axially moves setting, and drive the device of first motor in the described backward movement of described piston, the described screw rod second party opposite with first direction rotated up, wherein, thereby driving second motor makes piston carry out backward movement with first speed of setting when screw rod does not rotate, and, when screw rod when second direction is rotated, piston is carried out backward movement with the second speed of setting.
Can be with the predetermined angle rotary screw preset time cycle, up to screw rod or piston arrives precalculated position or the arrival of the resin pressure in barrel in screw rod or piston backward movement predetermined value.
When screw rod or piston arrive the precalculated position in backward movement after, begin in backward movement, through after the resin pressure in the barrel arrives predetermined value behind the predetermined period of time or in the backward movement of screw rod or piston, can begin the rotation of screw rod.
The second speed of the backward movement of screw rod or piston is lower than first speed of the backward movement of screw rod or piston.
First speed based on the backward movement of the predetermined pressure of resin and detected pressures control screw rod or piston.Simultaneously can be based on the second speed of the backward movement of the predetermined pressure of resin and detected pressures control screw rod or piston.
The backward movement of screw rod or piston can not have stage and screw rod rotation the stage finish after of screw rod before beginning to rotate when screw rod did not rotate, and screw rod or piston can be set at different values in the speed of the backward movement in these stages with second speed.
When the rotation of screw rod does not finish before the backward movement at screw rod or piston finishes, when can finishing in the backward movement of screw rod or piston, the rotation of screw rod on the second direction stops.
This controller may further include a device, this device was used for before the start injection process and the backward movement of screw rod or piston finish after at direction of advance axially mobile screw or piston, resin pressure in barrel arrives predetermined value or screw rod or piston arrives precalculated position or arrives predetermined period of time, and in the forward motion of screw rod or piston on second direction rotary screw, perhaps rotary screw on second direction thereafter.
Because screw rod continues to retreat, the situation with reverse rotation of retreating compared with carrying out screw rod respectively can shorten cycle time.Further, can suppress unexpected pressure change, thereby when the screw rod reverse rotation, realize accurately measurement with astern speed operation screw rod by the astern speed of reduction screw rod or under pressure control.Because the condition of can the reverse rotation of independent regulation screw rod and retreating, thereby can adjust to optimum condition at short notice.In addition, after the screw rod reverse rotation, thereby the astern speed that can increase screw rod once more shortens cycle time.If controller is designed to set two speed, promptly the speed that retreats when reverse rotation and during not reverse rotation of screw rod further, can reduce the number of setting item, thereby can more easily set optimum condition.
Description of drawings
Fig. 1 is the block diagram of critical piece that has provided according to an embodiment of the invention, has been used to control the controller of spiral direct-injection type injection (mo(u)lding) machine;
Fig. 2 is the schematic diagram of pre-plasticising formula injection (mo(u)lding) machine;
Fig. 3 for explanation according to diagrammatic sketch this embodiment, that be used to measure the operation summary of the reduced pressure treatment after the end;
Fig. 4 is the flow chart that has provided according to the reduced pressure treatment of this embodiment;
Fig. 5 has provided the flow chart of being determined the reduced pressure treatment in reverse rotation zone by the time.
The specific embodiment
Fig. 1 has provided the critical piece of injection (mo(u)lding) machine according to an embodiment of the invention.Spray nozzle part 2 sticks on the end of injection barrel 1, and screw rod 3 is by injection barrel 1.It is the pressure sensor 5 of load unit (Load Cell) for example that screw rod 3 has, and is used for the resin pressure of detection effect on screw rod 3.The servomotor M2 that is used for the screw rod rotation is by transmission mechanism 6 (being made of pulley, conveyer belt etc.) rotary screw 3.Further, be used for servomotor M1 that screw rod moves forward and backward and move axially at it by transmission mechanism 7 drive screws 3, this transmission mechanism 7 comprises pulley, conveyer belt, ball screw/nut body and some other mechanisms that spinning movement are converted to line movement.Symbol P1 represents the location/velocity detector, and it makes the location/velocity of the servomotor M1 that screw rod moves forward and backward detect the shaft position and the speed of screw rod 3 by detection.Symbol P2 represents the location/velocity detector, and it detects the position of rotation and the speed of screw rod 3 by the location/velocity that detects servomotor M2.Further, symbol 4 is represented funnel, and resin is provided to injection barrel 1 by this funnel.
The controller 10 of injection (mo(u)lding) machine has as the CNCCPU20 that is used for the microprocessor of Numerical Control, as the PCCPU 17 of the microprocessor that is used for Programmable Logic Controller with as the servo CPU 15 that is used for servo-controlled microprocessor.Information can be selected the input and output of each microprocessor by bus 26, and transmits between microprocessor.
Servo CPU 15 with the ROM 13 that is loaded with special-purpose control program, the RAM14 that is used for temporarily storing data links to each other, this special use control program is used for SERVO CONTROL that position closed loop, speed closed loop and current closed-loop are handled.Further, thus connect servo CPU 15 it can pass through the pressure signal that A/D (analog/digital) converter 16 detects from pressure sensor 5.Pressure sensor 5 test example that stick on the injection (mo(u)lding) machine main body side are as being the various pressure of injection pressure.Further, servo CPU 15 links to each other with servo amplifier 12,11, servo amplifier 12,11 in response to from the instruction of servo CPU 15 respectively driving link to each other with the screw rod rotating shaft with injection shaft, be used to the servomotor M1, the M2 that inject and rotate.The output that sticks on position-speed detector P1, the P2 on servomotor M1, the M2 respectively is fed to servo CPU 15.The position of rotation separately of servomotor M1, M2 is calculated by the position feed back signal of servo CPU 15 position-baseds-speed detector P1, P2, is updated then and is stored in the current location memory register.Only show the servomotor M1, the M2 that drive injection shaft and screw rod rotating shaft among Fig. 1, detected servomotor M1, M2 position-speed detector P1, the P2 of position of rotation and speed separately, and servo amplifier 12,11.Yet, be not presented at various other axles among Fig. 1, for example be used for matched moulds the matched moulds axle, be used for from what mould took out shaped article ejecting axle etc., arrange in the same way.
PCCPU 17 links to each other with ROM 18, RAM 19, and ROM 18 stores sequential programme of the operation in tandem that is used to control injection (mo(u)lding) machine etc., and RAM 19 is used for the temporary transient storage of calculated data etc.CNCCPU 20 links to each other with ROM 21, RAM 22, and ROM 21 stores after the automated operator that is used for controlling usually injection (mo(u)lding) machine and the measurement related to the present invention decompression control program etc., and RAM22 is used for the temporary transient storage of calculated data etc.
The RAM 23 (being made of nonvolatile memory) that is used for the forming data storage preserves memory for forming data, stores condition of molding relevant with injection (mo(u)lding) machine and various setting value, parameter, macro-variable etc.LCD (LCD)/MDI (artificial data input) 25 links to each other with bus 26 by interface (I/F) 24, thereby can select graphical display screen or function menu and can import various data.LCD/MDI 25 has ten keys being used for numeric data input and various function keys etc.Alternatively, CRT can replace LCD to be used as display unit.
Based on this configuration, the operation in tandem of the whole injection (mo(u)lding) machine of PMCCPU 17 control, CNCCPU 20 is according to operation sequence among the ROM 21 and the condition of molding etc. that is used for RAM 23 storages of data storage, to each servomotor distribution move.Position and feedback speed signal according to the move that is distributed to axle and position-speed detector P1, P2 detection, servo CPU 15 carries out traditional SERVO CONTROL, for example position closed loop control, speed closed loop control, current closed-loop control etc., perhaps carry out so-called digital servo and handle, thereby control servomotor M1, M2 drivingly.
Be loaded with the ROM 21 that is used to measure the program that finishes the back reduced pressure treatment if the controller of traditional electrical injection (mo(u)lding) machine provides, the configuration of above-mentioned controller is identical with the controller of traditional electrical injection (mo(u)lding) machine.
The controller of spiral direct-injection type injection (mo(u)lding) machine has been described with reference to figure 1.In addition, the present invention also can be applicable to pre-plasticising formula injection (mo(u)lding) machine, and this pre-plasticising formula injection (mo(u)lding) machine has screw rod that is used to mould/measure operation and the piston that is used for injection operation.
Fig. 2 has schematically provided pre-plasticising formula injection (mo(u)lding) machine.Nozzle 102 sticks on the end of injection barrel 100, has piston 108 in the injection barrel 100.It is the pressure sensor 105 of load unit for example that piston 108 has, and is used for the resin pressure of detection effect on piston 108.Be used for piston-advance and the servomotor M1 ' that retreats and move axially at it by transmission mechanism 107 driven plunger 108, transmission mechanism 107 comprises pulley, conveyer belt, ball screw/nut body and some other mechanisms that spinning movement are converted to line movement.Screw rod 103 is provided at and moulds/measures in the barrel 101, and mould/measure barrel 101 and link to each other with injection barrel 100 at its end.The servomotor M2 ' that is used for the screw rod rotation is by transmission mechanism 106 (being made of pulley, conveyer belt etc.) rotary screw 103.Symbol P1 ' represents the location/velocity detector, and it makes piston-advance and the location/velocity of the servomotor M1 ' that retreats detect the shaft position and the speed of piston 108 by detection.Symbol P2 ' represents the location/velocity detector, and it detects the position of rotation and the speed of screw rod 103 by the location/velocity that detects servomotor M2 '.Further, symbol 104 is represented funnel, and resin is provided to by this funnel and moulds/measure barrel 101.
In above-mentioned pre-plasticising formula injection (mo(u)lding) machine, servomotor M1 ' and M2 ', location/velocity detector P1 ' and P2 ' and the pressure sensor 105 identical mode to provide with Fig. 1 is connected to numerical controller 10, thus the control injection (mo(u)lding) machine.
Fig. 3 is for illustrating the schematic diagram according to the operation summary of the reduced pressure treatment after the measurement end of present embodiment.Fig. 3 has provided the reduced pressure treatment of direct-injection type injection (mo(u)lding) machine.Operation according to the present embodiment measuring process is characterised in that, with identical in conventional situation, is subjected to back pressure when screw rod 3 retreats to the measuring position set, and decompression operation finishes the back and carries out measuring.In this decompression operation, screw rod 3 is retreated to setting decompression terminal position, and in reverse rotation in some zone between back-off period.Screw rod 3 forward directions rotation when measuring, and reverse rotation is opposite with this forward direction rotation.
As shown in Figure 3, when screw rod 3 with conventional method in same mode forward direction rotate to carry out and mould/measure when operation, screw rod 3 is subjected to back pressure, screw rod 3 retreats to the measuring position of setting then.When finishing to measure under this state, screw rod 3 retreats with setting speed V1.At this moment, the rotating to be of screw rod 3 " 0 ", promptly screw rod 3 does not retreat with the speed of V1 rotatably.When reverse rotation starting point that arrive to set, after this, screw rod 3 reverse rotations and retreat with the speed V2 different with astern speed V1.When reverse rotation end point that arrive to set, screw rod 3 stops reverse rotation, and the different astern speed V3 (can be identical with above-mentioned astern speed V1) of astern speed V2 that uses with reverse rotation time of screw rod 3 retreats then.When arriving the decompression end position of setting, stop to retreat, measure operation so finish.In the example that Fig. 3 provides, to set the astern speed V2 in reverse rotation zone to such an extent that be lower than other regional astern speed V1 and V3, reason is as follows.If the astern speed of the screw rod of reverse rotation is too high, the pressure that the pressure of the measurement resin that the screw rod reverse rotation brings minimizing effect and screw rod retreat the measurement resin that brings reduces the effect collaborative work.So unexpected pressure change takes place, thereby the measuring amount of resin changes inevitably also.This has increased the dispersion or the minimal buffering amount of injection pressure, and its control is also very difficult.Yet,, therefore, thereby reduce the adjustment of the astern speed promotion in reverse rotation zone to the reverse rotation of screw rod 3 owing to must prevent this situation.
As mentioned above, measuring method of the present invention and conventional method similarity are: screw rod 3 is subjected to back pressure and is rotated by forward direction and to mould resin, thereby screw rod 3 arrives the measuring position of setting.Yet the difference of method of the present invention and traditional measurement method is: arrive the action of screw rod 3 behind this measuring position.According to the present invention, after screw rod 3 arrived the measuring position, screw rod 3 retreated and reverse rotation in retreating some middle zone.In these reverse rotation zones, screw rod 3 retreats with the speed different with being used for other regional speed.In other zone, control screw rod 3 stops the rotation.
Because the screw rod back off area partly comprises the reverse rotation zone, thereby, can independently set the also length and the reverse rotation speed in meticulous adjusting reverse rotation zone.Therefore, can prevent that excessive reverse from rotating and can regulate decompression with pinpoint accuracy.
The number in the zone of screw rod reverse rotation can be one or more, and can be right after screw rod begin to retreat the back or be right after retreating end before.
Retreat beginning back elapsed time or resin pressure (pressure on the screw rod) decides the reverse rotation starting point according to going-back position, the screw rod of screw rod.Further, begin the anglec of rotation after back elapsed time, resin pressure (pressure on the screw rod) and screw rod reverse rotation begin according to going-back position, the reverse rotation of screw rod and decide reverse rotation end point in the reverse rotation zone.
Can preestablish or from actual detected to pressure and the goal pressure of setting based on resin pressure (pressure on the screw rod), obtain astern speed V1, V2 and the V3 of screw rod.For example, can based target pressure and detected pressure between difference control astern speed V1, V2 and V3.
Fig. 4 is the flow chart that has provided the algorithm of the reduced pressure treatment in the measuring method that the CNCCPU 20 by present embodiment carries out.
In the example that Fig. 4 provides, control based on form for example shown in Figure 3.The beginning and the end point in screw rod reverse rotation zone and retreat halt (decompression end point) and be set in the screw back position, and also set astern speed V1, V2 and V3.Further, also preestablish the reverse rotation speed Rv of screw rod in the reverse rotation zone.
Moulding in the measuring process/measuring operation carries out in a conventional manner, and screw rod 3 retreats.When screw rod 3 arrives resin measurement end point (step a1), CNCCPU 20 is to the rotation halt instruction of servo CPU 15 outputs to screw rod 3.Then, servo CPU 15 stops to make the rotation of the servomotor M2 of screw rod rotation.Further, read the astern speed V1 and the reverse rotation speed Rv (step a2) of first setting regions.Then, screw rod 3 retreats (step a3) with the screw rod astern speed V1 that reads.Especially, CNCCPU 20 transmits the instruction of moving with screw rod astern speed V1 to servo CPU 15, the servomotor M1 that servo then CPU 15 FEEDBACK CONTROL move forward and backward screw rod, thus make screw rod retreat with the astern speed V1 of order.
Screw rod 3 does not retreat with the astern speed V1 that sets rotatably, up to so that the position of the screw rod 3 of the position of rotation representative of the servomotor M1 that screw rod moves forward and backward arrives the reverse rotation starting position of setting, (step a4) in the current location memory register detected and be stored in this reverse rotation position by position-speed detector P1.Arrive the reverse rotation starting position if determine screw rod, then read setting the reverse rotation zone screw rod astern speed V2 and provide the instruction of the screw rod astern speed V2 in reverse rotation zone, servomotor M1 makes screw rod 3 retreat (step a5) with astern speed V2 then.Simultaneously, provide the instruction of reverse rotation speed Rv, thereby servomotor M2 makes screw rod 3 with speed Rv reverse rotation (step a6).
Then, determine by position-speed detector P1 detect and by the axle shift position of the screw rod 3 of current location memory register storage whether with the screw rod reverse rotation end position of setting identical (step a7), and wait for and arrive this reverse rotation end position.
Retreat into the reverse rotation end position if detect screw rod 3, screw rod 3 stops the rotation, and the astern speed of screw rod is switched to the astern speed V3 (step a8) of setting.That then, determines whether screw rod retreat into setting retreats end position (decompression end position) (step a9).Arrive the decompression end position if determine screw rod 3, then stop to retreat (the step a10) of screw rod, so finish to measure operation and the following injection process of beginning.
Finish if carry out detecting after the judgement of step a7 and a9 the reverse rotation of screw rod continuously, program proceeds to step a8, so screw rod stops the rotation, and retreats with astern speed V3.Determine then whether screw position arrives the decompression end position.If determine to arrive the decompression end position, then can stop the rotation of screw rod 3 simultaneously and retreat.
According to the foregoing description,, determine the timing that reverse rotation begins at step a4 according to the beginning in the reverse rotation zone of the going-back position of screw rod decision screw rod reverse rotation.Alternatively, yet, can by resin pressure or comfortable measure the screw rod reverse rotation that is used to reduce pressure after the end point begin since institute's elapsed time, determine this timing.If the beginning by the reverse rotation of institute elapsed time decision screw rod, only need preestablish elapsed time, in step a3 again with the beginning timer, determine whether time that timer is measured arrives the elapsed time of setting.Fig. 5 has provided the process of these steps.
If by the beginning of resin pressure decision screw rod reverse rotation, only need to detect resin pressure on the screw rod 3 that detects by pressure sensor 5 by A/D converter 16, determine according to screw position whether detected pressure arrives the pressure of setting at step a4.
In addition, in the aforementioned embodiment, also determine screw rod reverse rotation end position by screw back position.Alternatively, yet, can begin the anglec of rotation that back elapsed time, resin pressure and reverse rotation begin the screw rod 3 that the back covers according to reverse rotation and determine screw rod reverse rotation end position.If determine the reverse rotation end position, only need preestablish elapsed time, in step a6, reset and begin timer, determine at step a7 whether the time of timer measurement arrives the elapsed time of setting by elapsed time.Fig. 5 has provided the process of these steps.
If set screw rod reverse rotation end position by resin pressure, on the other hand, the resin pressure in the time of only need preestablishing screw rod and stop reverse rotation, determine at step a7 that pressure sensor is 5 detected, whether the pressure on the screw rod 3 arrive pressure setting or lower.If determine to arrive that set or lower pressure, then program proceeds to step a8.
In addition, if determine the end in reverse rotation zone by the anglec of rotation of screw rod, then only need preestablish the anglec of rotation, read and store screw rod position of rotation (detect and be stored in the memory register of position at step a6) by position-speed detector P2, determine at step a7 whether the position of rotation of storing in the current location memory register covers the anglec of rotation of the screw rod of setting then.
Fig. 5 is the flow chart of the processing under the reverse rotation zone beginning of being determined screw rod by the time and end situation.The difference of this processing and processing shown in Figure 4 is: additionally reset and begin timer at step b3, determine at step b4 whether the time of timer measurement arrives the time started of setting, additionally reset and begin timer at step b6, determine at step b7 whether time that timer is measured arrives the reverse rotation concluding time of setting.Other step of this processing is identical with the processing among Fig. 4.
According to previous embodiment, astern speed V1, V2 when screw rod retreats for decompression and V3 are setting values.Alternatively, yet, can control astern speed based on resin pressure.
Goal pressure be can preestablish, difference or deviation with the pressure that detects by pressure sensor 5 obtained, and, based on the astern speed of the pressure divergence control screw rod that obtains.In this case, for the reverse rotation zone of screw rod, for the influence of the reverse rotation of adjusting screw(rod) subtly, the expectation astern speed is lower than other regional astern speed, therefore, is used for taking advantage of little that the gain of pressure divergence should be than other zone.
Although described spiral direct-injection type injection (mo(u)lding) machine in conjunction with the foregoing description, the present invention also can be applicable to have the pre-plasticising formula injection (mo(u)lding) machine of piston and screw rod.The rotary speed of the screw rod of spiral direct-injection type injection (mo(u)lding) machine and the anglec of rotation are corresponding to the rotary speed and the anglec of rotation of the screw rod of pre-plasticising formula injection (mo(u)lding) machine.The axle of the screw rod of spiral direct-injection type injection (mo(u)lding) machine moves moving corresponding to the piston of pre-plasticising formula injection (mo(u)lding) machine.
In addition, although may increase the cycle, extra process can be guaranteed the injection of pinpoint accuracy, and this extra process is used for before the injection after fallback procedures screw rod or piston being advanced on injection direction, thereby arrives predetermined pressure or position at a predetermined velocity or at the fixed time.In this case, based on the position that arrives in the extra process (this position is as the reference point of injection beginning in the injection process), initiation pressure keeps process after injection process has been injected the scheduled volume resin.Predetermined speed is the speed that is obtained by pre-set velocity or pressure controlled result.Advance in the process of reference point or afterwards at screw rod, screw rod with the opposite reverse rotation of direction of measuring.Therefore, can prepare for more accurate injection.Should obtain in advance and advance to the predetermined pressure of the process of reference point, the optimum value of Position, Velocity and Time by settings such as tests, these values change according to resinous type or other condition of molding.
Claims (16)
1. the controller of an injection (mo(u)lding) machine, described injection (mo(u)lding) machine is the spiral direct-injection type injection (mo(u)lding) machine that has first motor that is used for rotary screw in barrel and be used for axially moving second motor of described screw rod in described barrel, and described controller comprises:
Be used for driving described first motor and rotate up the resin of described screw rod before with the described screw rod of feeding at described barrel in first party, and drive described second motor that is used to measure described resin up to described screw axial move to the device of default measurement end position;
Be used to set the device of first and second friction speeds that described screw rod arrives the described backward movement of the distance of the backward movement of described screw rod behind the described default measurement end position and described screw rod; And
Thereby be used to drive described second motor with described screw axial move setting distance make described screw rod after the measurement end position that arrives described setting, carry out described backward movement, and drive described first motor and rotate up the device of the described screw rod in the described backward movement in the second party opposite with described first direction
Wherein, thereby drive described second motor described screw rod when described screw rod does not rotate and carry out described backward movement, and carry out described backward movement with the second speed of described setting when described screw rod described screw rod when described second party rotates up with first speed of described setting.
2. the controller of injection (mo(u)lding) machine according to claim 1, wherein, described screw rod rotates the preset time cycle in described backward movement.
3. the controller of injection (mo(u)lding) machine according to claim 1, wherein, described screw rod in described backward movement with predetermined angle rotation.
4. the controller of injection (mo(u)lding) machine according to claim 1, wherein, described screw rod rotation arrives the going-back position of being scheduled in described backward movement up to described screw rod.
5. the controller of injection (mo(u)lding) machine according to claim 1, wherein, described screw rod rotates in described backward movement, and the resin pressure in described barrel arrives predetermined value.
6. the controller of injection (mo(u)lding) machine according to claim 1 wherein, begins to carry out described rotation when described screw rod arrives the precalculated position in described backward movement after.
7. the controller of injection (mo(u)lding) machine according to claim 1 wherein, from the described backward movement of described screw rod, through behind the predetermined period of time, begins the described rotation of described screw rod.
8. the controller of injection (mo(u)lding) machine according to claim 1 wherein, in the described backward movement of described screw rod, after the resin pressure arrival predetermined value in described barrel, begins the described rotation of described screw rod.
9. the controller of injection (mo(u)lding) machine according to claim 1, wherein, the described second speed of the described backward movement of described screw rod is lower than described first speed of the described backward movement of described screw rod.
10. the controller of injection (mo(u)lding) machine according to claim 1 wherein, based on the predetermined pressure and the detected pressures of resin, is controlled described first speed of the described backward movement of described screw rod.
11. the controller of injection (mo(u)lding) machine according to claim 1 wherein, based on the predetermined pressure and the detected pressures of resin, is controlled the described second speed of the described backward movement of described screw rod.
12. the controller of injection (mo(u)lding) machine according to claim 1, wherein, when not rotating, the described backward movement of described screw rod has stage and the stage after the described rotation of described screw rod finishes before the described rotation of described screw rod begins, and described controller further comprises the device that described screw rod is set at different values in the speed of the described backward movement in these stages and described second speed.
13. the controller of injection (mo(u)lding) machine according to claim 1, wherein, if the described rotation of described screw rod does not finish before its backward movement finishes, when finishing, the described described backward movement that is rotated in described screw rod of described screw rod on described second direction stop.
14. the controller of injection (mo(u)lding) machine according to claim 1, further comprise a device, be used for: before the start injection process and after the described backward movement end of described screw rod, on direction of advance, axially move described screw rod, resin pressure in described barrel arrives predetermined value or described screw rod arrives the precalculated position or passed through a predetermined period of time, and rotates up described screw rod in described second party in the forward motion of described screw rod.
15. the controller of injection (mo(u)lding) machine according to claim 1, further comprise a device, be used for: before the start injection process and after the described backward movement end of described screw rod, on direction of advance, axially move described screw rod, resin pressure in described barrel arrives predetermined value or described screw rod arrives the precalculated position or passed through a predetermined period of time, rotates up described screw rod in second party then.
16. the controller of an injection (mo(u)lding) machine, described injection (mo(u)lding) machine is to have first motor that is used for rotary screw in first barrel and be used in second barrel axially pre-plasticising formula injection (mo(u)lding) machine of second motor of mobile piston, and described controller comprises:
Be used to drive described first motor and rotate up the resin of described screw rod before, and drive described second motor that is used to measure described resin axially moves to default measurement end position up to described piston device with the described piston of feeding in described second barrel in first party;
Be used to set the device of first and second friction speeds of the described backward movement of the distance of the backward movement of described piston behind the described default measurement end position of described piston arrives and described piston; And
Thereby being used to drive described second motor makes described piston carry out described backward movement after the measurement end position that arrives described setting the distance that described piston axially moves setting, and drive the device of described first motor in the described backward movement of described piston, described screw rod is rotated up in the second party opposite with described first direction
Wherein, thereby driving described second motor makes described piston first speed with described setting when described screw rod does not rotate carry out described backward movement, and, when described screw rod when described second party rotates up, described piston is carried out described backward movement with the second speed of described setting.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2006045390 | 2006-02-22 | ||
| JP2006045390 | 2006-02-22 | ||
| JP2006235711 | 2006-08-31 |
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| CN100482444C true CN100482444C (en) | 2009-04-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102007059432A1 (en) * | 2007-12-10 | 2009-06-18 | Zhafir Plastics Machinery Gmbh | Piston injection unit for an injection molding machine |
| JP5657818B2 (en) * | 2013-03-15 | 2015-01-21 | ファナック株式会社 | Resin discharging device for injection molding machine |
| CN111016102B (en) * | 2019-12-17 | 2022-07-01 | 广东伊之密精密注压科技有限公司 | Control method and control device for pressure relief of injection molding machine and injection molding machine |
| JP7356391B2 (en) * | 2020-03-31 | 2023-10-04 | 住友重機械工業株式会社 | Injection molding machine |
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