CN102555180A - Injection and pressure maintaining switching control system and method for injection molding machine based on nozzle pressure - Google Patents
Injection and pressure maintaining switching control system and method for injection molding machine based on nozzle pressure Download PDFInfo
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- CN102555180A CN102555180A CN2012100306268A CN201210030626A CN102555180A CN 102555180 A CN102555180 A CN 102555180A CN 2012100306268 A CN2012100306268 A CN 2012100306268A CN 201210030626 A CN201210030626 A CN 201210030626A CN 102555180 A CN102555180 A CN 102555180A
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Abstract
The invention relates to a control method for an injection molding process and aims to provide an injection and pressure maintaining switching control system and an injection and pressure maintaining switching control method for an injection molding machine based on nozzle pressure. The system comprises the injection molding machine, an injection molding hydraulic system, a pressure and pressure slope threshold value setting module, a nozzle pressure acquisition module and a switching control module, wherein the pressure and pressure slope threshold value setting module is connected to the switching control module; the nozzle pressure acquisition module is arranged at a position opposite to a nozzle of an injection barrel of the injection molding machine and is connected to the switching control module through a signal line; and the switching control module is connected to the injection molding hydraulic system which is arranged on the injection molding machine through the signal line. The switching safety can be improved, an error of slope calculation is avoided, and stable switching is realized. A pressure sensor has low requirement on dimensional accuracy and is convenient to mount and convenient to implement. The problem of difficulty in detection by employing die cavity pressure switching and hysteresis of pressure judgment by employing the injection molding hydraulic system can be solved.
Description
Technical field
The present invention relates to the control method of injection moulding process, say in more detail, the present invention relates in the injection machine injection molding process injection process to the method for handover control of pressure maintaining period, realize being expelled to pressurize steadily, the non-overshoot switching controls.
Background technology
Injection machine is that the macromolecule raw material are heated to the temperature that production needs through the charging basket of injection machine, becomes molten state, will be heated to the polymeric fluid of molten state then, through the processing equipment of screw of injection cooling forming in the mould.Injection-moulding plastic can be realized one-shot forming to complex-shaped goods, have efficient height, size accurately, be fit to characteristics such as production in enormous quantities, be that the tool advantage of plastic products also is topmost processing mode.A typical fluid pressure type injection machine comprises injection mechanism, clamping, four parts of hydraulic system and control system.Injection molding process is the complex process of one-period property.A typical injection molding process comprises matched moulds, injection, pressurize, preformed and cooling, die sinking and ejects several steps.The effect of injection device is that plastics are plastified equably, and is expelled in the mold cavity.Injection device is by plasticizing parts (screw rod, charging basket, heater, nozzle), and hopper, metering device, transmission device, injection cylinder reach compositions such as moving oil cylinder.Mold closing mechanism is realized the switching of mould, when injection, should guarantee that mould closes tightly reliably.Mold closing mechanism is mainly by the front and back fixed form, moving die plate, and cylinder lever connecting rod, linkage, the mode transfer device, die cylinder, mould shifting oil cylinder and goods liftout attachment are formed.Hydraulic system and electric control system provide power and make injection machine require (pressure, speed, time, temperature) and sequence of movement work according to predetermined technical process.
The quality of injecting products is directly being controlled in macromolecular material, mould, injection machine and four aspects of Shooting Technique that injection moulding is used.Under the certain situation of macromolecular material, mould and the Shooting Technique of injection moulding, the quality of injecting products is directly determined by the technological parameter control accuracy of injection machine.The most important process conditions of injection mo(u)lding are temperature, injection precision, pressure and flow-controls etc. that the influence plasticizing is flowed and cooled off.
Injection and pressure maintaining period are the critical process of straight forming product, and the precision of its corresponding control of process parameters is directly connected to the quality of product.Originally be sent to the injection barrel of injection machine from injecting machine material tube through pre-plastic process when macromolecule; And be heated to the temperature of setting; Form molten state, closed die cavity is advanced in the injection screw filling that is rotated according to the hydraulic pressure speed of setting then, and this process becomes injection process.After macromolecule raw material that the die cavity of closure is melted attitude was filled with, injection screw continued to keep certain pressure to replenish the product that the contraction of macromolecule raw material in the cooling forming process forms accurate appearance and size, and this process becomes pressure maintaining period.Form final product through cooling procedure then.
Pressure maintaining period is very big to the influence of accurate plastic, says exactly, and pressurize is feeding preferably, reduces the plastic distortion, the control precision of plastic.The stable formed precision that determines plastic of dwell pressure, the final position of screw rod is constant to be the decisive factor of decision pressurize effect.Process of injection molding needs suitable dwell pressure, to improve the packing of plastic, reduces contraction distortion, guarantees part accuracy.But, be not that injection pressure is the bigger the better, pressure is crossed conference and is produced finning.Dwell pressure is not constant in the practical application; But adopt stage pressure maintaining period; Just pressure maintaining period is divided into several stages; From the injection process to the pressure maintaining period, begin, become pressurize one, pressurize two, third-class stage of pressurize with time sequencing, what the injecting products of different sizes was required wants the pressurize hop count different.Generally speaking the dwell pressure of phase I is maximum, then reduces successively.
Be a continuous process from the injection process to the pressure maintaining period, injection process serves as the control target with the speed of hydraulic pressure process of injection mainly, and pressure maintaining period serves as the control target with the pressure of hydraulic pressure process mainly.What constantly, adopt which kind of mode to switch to pressure maintaining period diverse ways is arranged from injection process, the effect of working control is also different.The method for handover control that at present main injection process changes pressure maintaining period mainly contains time mode, position mode and pressure mode.The time control mode is to set the time of injection process at injection stage, switches to pressure maintaining period later on when injection process reaches setting-up time.The position mode switches to pressure maintaining period for setting the position of injection screw in the injection process later on when injection screw reaches this position.And pressure controling mode is a pressure of setting hydraulic system, the pressure of the detection injection hydraulic system that the control system is real-time, and the pressure of hydraulic system reaches setting value and just switches to pressure maintaining period later in injection process.
Different method for handover control has different control features and control effect.For example utilize the pressure of parenteral solution pressing system to switch; Because the pressure of hydraulic system and the pressure in the mould cavity are also unequal; And have hysteresis, and cause the injection pressure over control, form the mould inner mould cavity pressure and rise rapidly; Substantially exceed the highest dwell pressure of setting, final pressure is too high to cause forming injection defectives such as overlap, song stick up.Therefore it is very important catching and being transformed into pressure maintaining period suitable opportunity rapidly.
Nozzle exit pressure and cavity pressure connect each other, utilize the detection of nozzle exit pressure can reflect the variation of cavity pressure indirectly.The pressure maintaining period pressure curve of three sections pressurizes is provided with shown in accompanying drawing 1, and the parameter of general three sections pressurizes is that ladder descends.201 be first section pressurize wherein in chronological order, 202 is second section pressurize, and 203 is the 3rd section pressurize.And conventional method for handover control die cavity internal pressure changes shown in accompanying drawing 2.Wherein 302 dwell pressure is set for three sections of meaning described in the accompanying drawing 1; And dotted portion 301 is a die cavity inside actual pressure; Can find out that pressurize incipient stage die cavity internal pressure rises rapidly, substantially exceed first section pressure is set that this has very big harmful effect for product quality.The present invention is exactly in order to overcome this problem, to improve the injecting products quality.
Invention emphasis of the present invention is exactly how accurately to solve, realize rapidly the switching problem of injection process to pressure maintaining period, realizes being expelled to steady, the pressure non-overshoot switching controls of pressurize.
Summary of the invention
The technical problem that the present invention will solve is, overcomes the deficiency of prior art, proposes a kind of new injection pressurize handover control system based on injection barrel nozzle exit pressure.Further object of the present invention provides a kind of injection pressurize method for handover control based on nozzle exit pressure, realizes being expelled to the steady switching of pressure maintaining period.
The technical scheme that technical solution problem of the present invention adopts is following:
A kind of injection machine injection pressurize handover control system based on nozzle exit pressure is provided, comprises injection machine and injection hydraulic system; Also comprise: the pressure and the pressure slope threshold value setting module that are used to be provided with nozzle exit pressure threshold value and pressure rate of rise threshold value; Be used for detecting in real time the nozzle exit pressure acquisition module of the nozzle place pressure of injecting barrel; Be used to realize nozzle exit pressure and pressure rate of rise measured value and threshold ratio, the switching controls module of injection process and pressure maintaining period switching; Pressure and pressure slope threshold value setting module are connected to the switching controls module, and the nozzle exit pressure acquisition module is installed on the nozzle relevant position of the injection barrel of injection machine, and are connected to the switching controls module through holding wire; The switching controls module is connected to the injection hydraulic system that is located on the injection machine through holding wire.
The present invention further provides the injection machine injection pressurize method for handover control based on aforementioned system, comprising:
(1) pressure and pressure slope threshold value setting module are according to the maximum dwell pressure V of injection machine processing parameter setting
MaxNozzle exit pressure threshold value V is set
t, pressure rate of rise threshold k is set according to actual bets molding machine maximum injection speed
t, and two setting thresholds are sent to the switching controls module;
(2) the nozzle exit pressure acquisition module detects the pressure V of nozzle place of injection barrel in real time according to sampling period Δ T
k, and pressure data is sent to the switching controls module;
(3) the switching controls module real-time nozzle exit pressure data that will receive are carried out A/D and are transformed and obtain nozzle exit pressure V
k, and according to the current real-time pressure rate of rise K of formula (a) calculating
k:
In the formula, k representes current sampling instant, V
kBe the nozzle exit pressure of current sampling instant, V
K-1Be the nozzle exit pressure of previous moment, Δ T is the sampling period;
(4) the switching controls module calculates current pressure rate of rise K
kAfter, preserve K
kTo be used for the calculating of following one-period; And carry out the quadratic average Filtering Processing according to formula (b), obtain current effective pressure rate of rise K;
K＝(K
k+K
k1)/2 (b)
K wherein
kBe the current pressure rate of rise K that calculates through formula (a)
k, K
K-1For a last sampling instant calculates the pressure rate of rise;
(5) if detect the current nozzle pressure V that obtains
kSatisfy V
k>=V
t, and current effective pressure rate of rise K satisfies K>=K
t, then the switching controls module is sent the switching command of injection process to pressure maintaining period, and injection hydraulic system control injection machine is converted to pressure maintaining period by injection process; Otherwise do not carry out switching controls, injection machine continues to keep injection process constant.
Among the present invention, the value of Δ T is 0.1～10ms during said sampling interval.
Among the present invention, said nozzle exit pressure threshold value V
tSetting range be: V
t=(40%～80%) * V
Max
Among the present invention, said pressure rate of rise threshold k
tSetting range be 0～2000bar/s.
Concrete thinking of the present invention is following:
System architecture diagram of the present invention comprises pressure and pressure slope threshold value setting module 101, nozzle exit pressure acquisition module 105, switching controls module 102, injection hydraulic system 103 and injection machine 104 several sections shown in accompanying drawing 3.Nozzle exit pressure acquisition module 105 adopts pressure sensors are gathered the pressure at injection barrel nozzle place in real time, and control algolithm is switching controls module 102 inner realizations.Pressure and pressure slope threshold value setting module 101 are connected to switching controls module 102, with nozzle exit pressure threshold value V
tWith pressure rate of rise threshold k
tTwo parameters are sent to the switching controls module.Nozzle exit pressure acquisition module 105 is installed in the nozzle correspondence position of injection machine 104 injection barrels; The pressure at real-time detection nozzle place; And nozzle exit pressure acquisition module 105 is connected to switching controls module 102 through holding wire, sends the nozzle exit pressure of gathering in real time to switching controls module 102.Switching controls module 102 built-in switching controls algorithms; At first utilize the nozzle exit pressure that obtains in real time to calculate the nozzle exit pressure rate of rise; Judge comparison with the pressure and the pressure rate of rise of current nozzle pressure and setting module setting then; If current nozzle pressure is greater than the pressure threshold of setting; And the pressure rate of rise that calculates is greater than the pressure rate of rise of setting, and then switching controls module 102 realizes sending the switch-over control signal of injection process to pressure maintaining period, otherwise it is constant to continue the maintenance injection process.Switching controls module 102 is connected to injection hydraulic system 103 through holding wire, and hydraulic system is carried out actual control, realizes the switching of injection process and pressure maintaining period.And injection hydraulic system 103 is installed in injection machine 104 correspondence positions, the actual act and the operation of control injection machine.
The function of each module is specific as follows:
Pressure and pressure slope threshold value setting module 101 are provided with the needed nozzle exit pressure threshold value of switching controls V
tWith pressure rate of rise threshold k
tAccording to the maximum dwell pressure V that sets
MaxNozzle exit pressure threshold value V is set
t, V generally speaking
t=(40%～80%) * V
Max, and pressure rate of rise threshold k
tGenerally be provided with according to actual bets molding machine maximum injection speed, general range is 0～2000bar/s.
The calculating nozzle exit pressure rate of rise K that switching controls module 102 built-in calculation procedures are real-time.The nozzle exit pressure that switching controls module 102 at first utilizes nozzle exit pressure acquisition module 105 to gather and send through the A/D conversion calculations, obtains current nozzle exit pressure V
k, subscript k representes current sampling instant.And preserve current nozzle actual pressure V
k, calculate current real-time pressure rate of rise K through following formula (a) then
k.
V wherein
kBe the nozzle exit pressure of current sampling instant, and V
K-1The nozzle exit pressure of the previous moment of preserving for switching controls module 102, Δ T is the time in sampling interval, sampling period just, whenever gathers 105 at a distance from Δ T time switching controls module 102 through the nozzle exit pressure acquisition module and gathers the primary nozzle current pressures.The be provided with needs according to the accurate closed-loop control of actual injection moulding process, the acquisition capacity of pressure sensor, the conditions such as restriction of pressure acquisition modules A/D (analog digital) conversion speed of time in sampling interval Δ T are provided with, and are generally 0.1～10ms (millisecond) in the working control.
K＝(K
k+K
k-1)/2 (b)
K wherein
kBe the current pressure rate of rise K that calculates through formula (a)
k, K
K-1For a last sampling instant calculates the pressure rate of rise.
The switching judging process is following:
If detect the current nozzle pressure V that obtains
kSatisfy V
k>=V
t, and through formula (a) with (b) calculate effective pressure rate of rise K and satisfy K>=K
t, then switching controls module 102 realizes the switching of injection process to pressure maintaining period, and injection machine is converted to pressure maintaining period by injection process, otherwise does not carry out switching controls, and injection machine continues to keep injection process constant.
With respect to prior art, beneficial effect of the present invention is:
The present invention realizes that through nozzle exit pressure and two threshold values of the nozzle exit pressure rate of rise injection moulding process is expelled to the steady switching of pressurize; The effect of pressure rate of rise threshold parameter is in order to judge that die cavity has been melted macromolecule raw material basically and has been filled with; Pressure begins fast rise, and the effect of nozzle exit pressure threshold value can increase the security of switching, prevents the error of slope calculating; And adjust the switching point that is expelled to pressurize, reach stably and switch.Adopt nozzle place pressure to carry out switching controls, the pressure sensor dimensions required precision is low, and is easy for installation, just with enforcement.Adopt the detection of nozzle exit pressure, can overcome the difficult problem of the detection of adopting cavity pressure to switch,, be difficult in die cavity, install suitable pressure sensor and detect the die cavity internal pressure because general mould is very accurate.Can overcome simultaneously the hysteresis that adopts the injection hydraulic system pressure to judge.
Description of drawings
Fig. 1 is provided with curve for typical dwell pressure.
Fig. 2 is general method for handover control die cavity actual pressure curve.
Fig. 3 is the overall construction drawing of this handover control system.
The specific embodiment
Injection pressurize switching controls process with 60 tons of small injecting machines is that example describes, and injection process has 4 sections in this Shooting Technique parameter, and pressure maintaining period has 3 sections.The switching controls class of algorithms that the injection machine of other various tonnages and model is expelled to pressurize seemingly all is deemed to be within the scope of the present invention.
This enforcement is provided with curve by the typical pressure of the control system architecture of Fig. 3 and Fig. 1 and describes.
As shown in Figure 3, each module connects as follows: pressure and pressure rate of rise threshold value setting module 101 are connected to switching controls module 102, and nozzle exit pressure threshold value and nozzle exit pressure rate of rise threshold value are sent to switching controls module 102.The barrel nozzle place of injection machine 104 is equipped with nozzle exit pressure acquisition module 105; Nozzle exit pressure acquisition module 105 is connected to switching controls module 102 through holding wire; The switching controls module is built-in with A/D analog digital modular converter, and the pressure signal that nozzle exit pressure acquisition module 105 is sent converts data signal into.The calculating nozzle exit pressure rate of rise K that switching controls module 102 built-in calculation procedures are real-time.Switching controls module 102 is connected to hydraulic injection molding machine system 103 through holding wire, and hydraulic injection molding machine system 103 is installed on the injection machine 104.The nozzle effective pressure rate of rise K and the current nozzle pressure V that calculate when switching controls module 102
kSatisfying condition is drive controlling injection hydraulic system 103, and injection hydraulic system 103 drives injection machine 104 and realizes the switching of injection process to pressure maintaining period.
Three sections dwell pressures as shown in fig. 1 are provided with respectively as among Fig. 1 201,202, shown in 203.Wherein 201 is first section dwell pressure, and 202 is second section dwell pressure, and 203 is the 3rd section dwell pressure.Be provided with as follows according to three sections dwell pressures of actual conditions when supposing this injection machine converted products: first section dwell pressure 201 is set to 90bar, and second section dwell pressure 202 is set to 60bar, and the 3rd section dwell pressure 203 is set to 40bar.To this settings this injection pressurize method for handover control is described below.
At first, according to the injection machine technological parameter nozzle exit pressure threshold value V is set
tWith nozzle exit pressure rate of rise threshold k
tThree sections pressure settings as stated, the therefore maximum dwell pressure V that sets
Max=90bar, V generally speaking
t=(40%～80%) * V
Max, rule of thumb V can be set
t=40bar.And pressure rate of rise threshold k
tGenerally be provided with according to actual bets molding machine maximum injection speed, suppose that the final stage injection speed is 50%, this instance is provided with K
tBe 400bar/s.
Secondly, force samples cycle Δ T is set, carries out the real-time calculating of the pressure rate of rise.In order to realize pressure controlled quick response, this instance is provided with Δ T=1ms.The nozzle exit pressure that the switching controls module at first utilizes nozzle exit pressure acquisition module 105 to gather and send through the A/D conversion calculations, obtains current nozzle exit pressure V
k, subscript k representes current sampling instant.And preserve current nozzle actual pressure V
k, calculate current real-time pressure rate of rise K through following formula (a) then
k.
V wherein
kBe the nozzle exit pressure of current sampling instant, and V
K-1The nozzle exit pressure of the previous moment of preserving for switching controls module 102, Δ T is the time in sampling interval.
K＝(K
k+K
k-1)/2 (b)
K wherein
kBe the current pressure rate of rise K that calculates through formula (a)
k, K
K-1For a last sampling instant calculates the pressure rate of rise.
The current effective pressure rate of rise K that last switching controls module 102 utilizes formula (b) to calculate injects the switching judging with pressure maintaining period.
The switching judging process is following:
If detect the current nozzle pressure V that obtains
kSatisfy V
k>=V
t=40bar, and through formula (a) with (b) calculate effective pressure rate of rise K and satisfy K>=K
t=400bar/s, then switching controls module 102 realizes the switching of injection process to pressure maintaining period, and injection machine is converted to pressure maintaining period by injection process, otherwise does not carry out switching controls, and injection moulding process is proceeded injection control.
Claims (5)
1. the injection machine injection pressurize handover control system based on nozzle exit pressure comprises injection machine and injection hydraulic system; It is characterized in that, also comprise:
Be used to be provided with the pressure and the pressure slope threshold value setting module of nozzle exit pressure threshold value and pressure rate of rise threshold value;
Be used for detecting in real time the nozzle exit pressure acquisition module of the nozzle place pressure of injecting barrel; With
Be used to realize nozzle exit pressure and pressure rate of rise measured value and threshold ratio, the switching controls module of injection process and pressure maintaining period switching;
Pressure and pressure slope threshold value setting module are connected to the switching controls module, and the nozzle exit pressure acquisition module is installed on the nozzle relevant position of the injection barrel of injection machine, and are connected to the switching controls module through holding wire; The switching controls module is connected to the injection hydraulic system that is located on the injection machine through holding wire.
2. based on the injection machine injection pressurize method for handover control of the said system of claim 1, it is characterized in that, comprising:
(1) pressure and pressure slope threshold value setting module are according to the maximum dwell pressure V of injection machine processing parameter setting
MaxNozzle exit pressure threshold value V is set
t, pressure rate of rise threshold k is set according to actual bets molding machine maximum injection speed
t, and two setting thresholds are sent to the switching controls module;
(2) the nozzle exit pressure acquisition module detects the pressure V of nozzle place of injection barrel in real time according to sampling period Δ T
k, and pressure data is sent to the switching controls module;
(3) the switching controls module real-time nozzle exit pressure data that will receive are carried out A/D and are transformed and obtain nozzle exit pressure V
k, and according to the current pressure rate of rise K of formula (a) calculating real-time
k:
In the formula, k representes current sampling instant, V
kBe the nozzle exit pressure of current sampling instant, V
K-1Be the nozzle exit pressure of previous moment, Δ T is the sampling period;
(4) the switching controls module calculates current pressure rate of rise K
kAfter, preserve K
kTo be used for the calculating of following one-period; And carry out the quadratic average Filtering Processing according to formula (b), obtain current effective pressure rate of rise K;
K＝(K
k+K
k-1)/2 (b)
K wherein
kBe the current pressure rate of rise K that calculates through formula (a)
k, K
K-1For a last sampling instant calculates the pressure rate of rise;
(5) if detect the current nozzle pressure V that obtains
kSatisfy V
k>=V
t, and current effective pressure rate of rise K satisfies K>=K
t, then the switching controls module is sent the switching command of injection process to pressure maintaining period, and injection hydraulic system control injection machine is converted to pressure maintaining period by injection process; Otherwise do not carry out switching controls, injection machine continues to keep injection process constant.
3. method according to claim 2 is characterized in that, the value of Δ T is 0.1～10ms during said sampling interval.
4. method according to claim 2 is characterized in that, said nozzle exit pressure threshold value V
tSetting range be:
V
t＝(40％～80％)*V
max。
5. method according to claim 2 is characterized in that, said pressure rate of rise threshold k
tSetting range be 0～2000bar/s.
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|---|---|---|---|
| CN201210030626.8A CN102555180B (en) | 2012-02-10 | 2012-02-10 | Injection and pressure maintaining switching control system and method for injection molding machine based on nozzle pressure |
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|---|---|---|---|
| CN201210030626.8A CN102555180B (en) | 2012-02-10 | 2012-02-10 | Injection and pressure maintaining switching control system and method for injection molding machine based on nozzle pressure |
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| CN107848176A (en) * | 2015-08-27 | 2018-03-27 | 艾姆弗勒克斯有限公司 | Injection forming equipment and its control method |
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| CN112519153A (en) * | 2019-09-18 | 2021-03-19 | 发那科株式会社 | Control device and control method for injection molding machine |
| CN112571745A (en) * | 2020-11-19 | 2021-03-30 | 青岛歌尔微电子研究院有限公司 | Pressure control method and injection molding equipment |
| CN114750382A (en) * | 2022-03-31 | 2022-07-15 | 浙江凯华模具有限公司 | Injection pressure control system and control method |
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| Publication number | Publication date |
|---|---|
| CN102555180B (en) | 2014-01-22 |
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