CN105257629A - Non-linear correction system and method for pressure proportional valve of injection molding hydraulic system - Google Patents
Non-linear correction system and method for pressure proportional valve of injection molding hydraulic system Download PDFInfo
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- CN105257629A CN105257629A CN201510738636.0A CN201510738636A CN105257629A CN 105257629 A CN105257629 A CN 105257629A CN 201510738636 A CN201510738636 A CN 201510738636A CN 105257629 A CN105257629 A CN 105257629A
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Abstract
The invention relates to a correction method for an injection molding machine hydraulic system, in particular to a non-linear correction system and method for a pressure proportional valve of the injection molding hydraulic system. The non-linear correction system comprises the injection molding machine hydraulic system, the pressure proportional valve, a starting correction module, a pressure non-linear correction module and an analog output module, wherein the pressure non-linear correction module corrects a pressure output value according to the actual pressure value displayed by a pressure gage and sends the corrected value to the analog output module for pressure control; the analog output module amplifies and outputs an analog signal to the pressure proportional valve and controls the opening degree of the pressure proportional valve; the starting correction module is connected with the pressure non-linear correction module; the pressure non-linear correction module, the analog output module and the pressure proportional valve are sequentially connected through a signal line. The non-linear correction system and method for the pressure proportional valve of the injection molding hydraulic system can replace the functions of a pressure feedback sensor. People do not need to take part in calculation in the whole correction process, and compensation calculation is automatically achieved completely through the pressure non-linear correction module. Therefore the correction operation difficulty is greatly lowered, and a common operator can implement correction easily.
Description
Technical field
The present invention relates to a kind of method of coreection of Hydraulic System for Injection Moulding Machine, in more detail, the present invention relates to the non-linear correction method of pressure proportioning valve in Hydraulic System for Injection Moulding Machine.
Background technique
Molding and forming is one of main molding mode of plastic article.Injection machine enters cooling forming in the closed die cavity that designs by injection after melting of being heated by macromolecule raw material, forms that dimensional accuracy is high, the various plastic products of complex contour, is applicable in enormous quantities, made with high precision.The driving mode of injection machine has hydraulic type, full electric type and Electro-hydraulic Hybrid Type three kinds, wherein hydraulic type injection machine because load capacity is high, cost is low, simplicity of design and become the main flow of injection machine.The hydraulic system of usual hydraulic type injection moulding comes pressure and the speed of accurate hydraulic control system by a pressure proportioning valve and flow proportion valve, then the motion control of injection machine modules is realized in conjunction with various solenoid valve and Flow valve, wherein pressure proportioning valve and flow proportion valve are the cores of HYDRAULIC CONTROL SYSTEM, are to realize the guarantee that injection moulding process accurately controls.In hydraulic system, hydraulic oil is entered hydraulic system pipeline by driven by motor oil pump by hydraulic oil, first the traffic requirement of Shooting Technique setting is reached by the control of a flow proportion valve, then reached the settings of Shooting Technique by the pressure of the aperture hydraulic control of pilot pressure Proportional valve, finally realize the accurate control of injection machine each several part.
In Hydraulic System for Injection Moulding Machine, pressure proportioning valve and flow proportion valve are all generally that electric current is imported, by the aperture of the Current Control Proportional valve of input 0-1 ampere, and then the accurately pressure of hydraulic control system and flow.But due to the non-linear nature of pressure proportioning valve and the coupling of hydraulic system pressure and flow, the electric current making pressure proportioning valve input and the pressure of output are not linear corresponding, there is very large non-linear phenomena, especially in initial periods of low pressure.Therefore, in order to the pressure of accurate hydraulic control system, just must carry out to pressure proportioning valve the effect that gamma correction can reach linear convergent rate.The internal control circuit of general pressure proportioning valve own has certain nonlinear compensation function, but still cannot overcome the nonlinear characteristic of injection moulding process, the control system of injection machine must possess gamma correction ability, the linearity control ability of the pressure of injection hydraulic system can be realized.
The common hydraulic type injection machine of current major part, owing to not having pressure proportioning valve non-linear correcting function, causes hydraulic system pressure control accuracy very poor, can only produce the plastic product that some required precisions are not high.More advanced control system for shot machine possesses uses pressure proportioning valve non-linear correcting function, but its method of coreection is all arrange several nonlinear characteristic point to pressure proportioning valve output area, then manually try the Output pressure reference value of these characteristic points of method correction of gathering, the output reference value that control system is manually tried to gather out by these again carries out linear interpolation correction.The key of method of coreection is the setting of result characteristic point reference value, and the setting of this reference value adopts examination to gather by operator or professional commissioning staff, the methods such as artificial calculating are arranged, lose time, and layman is generally difficult to set suitable corrected value, thus cause gamma correction effect poor.
Usual injection machine is provided with the pressure that pressure indicator shows current hydraulic system, but this table is analog pressure gauge, mainly observes for injection machine operator, cannot directly input controller of plastic injection molding for control system.The present invention adopts the artificial simple mode participated in, and utilizes the existing pressure display instrument table of injection machine, realizes the non-linear automatic calibration of Hydraulic System for Injection Moulding Machine pressure proportioning valve, without the need to artificial calculating, greatly reduce the difficulty of non-method of coreection.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes deficiency of the prior art, provides a kind of Hydraulic System for Injection Moulding Machine gamma correction system and method.Be exactly utilize operator read injection machine pressure gauge numerical value and make feedback specifically, realize the automatic gamma correction of Hydraulic System for Injection Moulding Machine pressure proportioning valve.The present invention is based on the simple feedback of operator, reduce the calculation requirement to operator.
For technical solution problem, the technical solution used in the present invention is as follows:
A kind of system of gamma correction of injection hydraulic system pressure Proportional valve is provided, comprises the Hydraulic System for Injection Moulding Machine be arranged on injection machine; Establish pressure proportioning valve in Hydraulic System for Injection Moulding Machine, the outlet of pressure proportioning valve is connected with pressure gauge by pipeline; Described gamma correction system also comprises:
Start correction module, for the gamma correction process of breakout pressure Proportional valve;
Pressure gamma correction module, the actual pressure numerical value according to pressure gauge corrects pressure output value, and the numerical value after correcting is delivered to analog output module and is used for Stress control;
Analog output module, amplify and outputting analog signal to pressure proportioning valve to control its aperture;
Start correction module to be connected with pressure gamma correction module, pressure gamma correction module, analog output module are connected by signaling line successively with pressure proportioning valve.
In the present invention, described analog output module built-in signal amplifier.
Invention further provides the method for the gamma correction of injection hydraulic system pressure Proportional valve, comprise the correction to the characteristic point in pressure proportioning valve output range and the maximum output value of pressure, this process specifically comprises:
(1) first the maximum output journey point of pressure proportioning valve is corrected:
Pressure correction output module is made directly to export the pressure theory value P of maximum output journey point
max, then directly regulate the amplifier be located in analog output module, until the actual delivery pressure of pressure gauge display equals P
max; Represent that correction completes;
(2) within the scope of the Output pressure of Hydraulic System for Injection Moulding Machine, k characteristic point is selected at interval, and whole Output pressure process is divided into k+1 segmentation, and k is the positive integer of 1 ~ 15;
(3) by pressure gamma correction module respectively by the theoretical pressure output value P of this k Feature point correspondence
k 'with Output pressure scope maximum value P
maxas Output pressure setting value, deliver to analog output module for Stress control; Analog output module by analog signal output to pressure proportioning valve to control its aperture, Hydraulic System for Injection Moulding Machine is boosted; Read the current actual pressure value of pressure gauge display, and by its numerical value incoming pressure gamma correction module, utilize formula (a) calculating pressure to export the corrected value P of setting value by pressure gamma correction module
kt, deliver to analog output module as the setting value of second-order correction;
P
kt=P
k0+ P
k-P
ks(formula a)
In formula a, P
ktfor calibrated Output pressure setting value; P
kfor the not calibrated Output pressure setting value for a kth characteristic point, its value equals P
k' or P
max; P
ksfor the current actual pressure value of hydraulic system of pressure gauge display;
(4) repeat step (3), when the current actual pressure value of pressure gauge display is identical with Output pressure setting value, be namely considered as realizing completely the nonlinear compensation of pressure proportioning valve in characteristic point or maximum value;
Timing for the first time, if the P in formula a
k0=P
kif be repeated and repeatedly correct, P
k0for correcting the rear P obtained last time
kt.
(5) repeat above-mentioned steps (3) and (4), until all k the characteristic points chosen have corrected, then the trimming process of whole injection hydraulic system has terminated.
In the present invention, correct in later actual motion at injection machine, pressure gamma correction module is according to the correction data of characteristic point obtained before this and maximum output value, carry out gamma correction in the following manner, and corrected value is delivered to analog output module as real output value, thus the actual delivery pressure of Hydraulic System for Injection Moulding Machine and Output pressure setting value are consistent:
(1) as the pressure output value P of adapted to injection system setting
xsatisfy condition P
k≤ P
x< P
k+1(work as P
kduring for last characteristic point, P
k+1=P
max) time, carry out gamma correction according to formula b:
P=P
kt+ (P
x-P
k) × (P
(k+1) t-P
kt)/(P
k+1-P
k) (formula b)
(2) P is worked as
x< P
1, i.e. P
xbe in the beginning the 1st section of whole Output pressure process interval time, carry out gamma correction in the following manner:
P=P
x× P
1t/ P
k(formula c);
In above-mentioned each formula, P
xthe force value of the injection hydraulic system required for Shooting Technique, i.e. Output pressure setting value; P is calibrated Output pressure setting value, the i.e. real output value of pressure gamma correction module; P
ktfor the Output pressure setting value of a calibrated kth characteristic point; P
kfor the not calibrated Output pressure setting value of a kth characteristic point; P
(k+1) tfor the Output pressure setting value of calibrated kth+1 characteristic point; P
k+1for the not calibrated Output pressure setting value of kth+1 characteristic point.
In the present invention, for the Hydraulic System for Injection Moulding Machine of Output pressure scope 0 ~ 145bar, the value of k is 5 ~ 8.
Invention further provides the injection hydraulic line pressure control method based on preceding method, comprise the steps:
(1) after the gamma correction at every turn completing pressure proportioning valve, send instruction by man-machine dialog interface to controller, by pressure gamma correction module pressure value corresponding relation data are delivered in the memory module of controller and preserve;
Described pressure value corresponding relation data refer to through repeatedly correcting and corresponding relation data between the force value met required for the real output value of nonlinear compensation required pressure gamma correction module and Shooting Technique and Output pressure setting value;
(2) for new Shooting Technique:
When the Data Matching that inputted Shooting Technique requires force value and storage unit to preserve, controller directly calls the real output value of corresponding pressure gamma correction module, and is sent to the aperture control that analog output module carries out pressure proportioning valve;
When inputted Shooting Technique requires that force value is not mated with the data that storage unit is preserved, then carry out calculating pressure real output value by pressure gamma correction module according to formula (b) and formula (c), then analog output module is sent to, by the latter's outputting analog signal to pressure proportioning valve to control its aperture, and finally realize the Stress control of injection hydraulic system.
Compared with prior art, beneficial effect of the present invention is:
The present invention only need utilize the artificial pressure gauge reading injection machine, achieves the function of alternative pressure feedback sensor, and whole trimming process does not need manually to participate in calculating, and automatically realizes compensation calculation completely by pressure gamma correction module.Thus the operation easier corrected reduces greatly, and normal operations workman just can simply implement.
Figure of description
Accompanying drawing 1: injection hydraulic system pressure Proportional valve gamma correction system block diagram;
Accompanying drawing 2: correcting process schematic diagram;
Accompanying drawing 3: hydraulic system exports the 7 segmentation coreected cures that pressure maximum is 140bar.
Embodiment
First it should be noted that, the present invention relates to database technology, is that computer technology is applied in the one of industrial control field.In implementation procedure of the present invention, the application of multiple software function module can be related to.Claimant thinks, as reading over application documents, accurate understanding is of the present invention realize principle and goal of the invention after, when in conjunction with existing known technology, those skilled in the art can use its software programming technical ability grasped to realize the present invention completely.Aforementioned software function module comprises but is not limited to: start correction module, pressure gamma correction module, analog output module etc., this category of all genus that all the present patent application files are mentioned, claimant will not enumerate.
The present invention proposes a kind of system (as shown in Figure 1) of gamma correction of injection hydraulic system pressure Proportional valve.This system comprises startup correction module 101, pressure gamma correction module 102, analog output module 103, Hydraulic System for Injection Moulding Machine 104 and the several part of injection machine 105.Start correction module 101 and be connected to pressure gamma correction module 102, for starting whole pressure gamma correction process.Pressure gamma correction module 102 is connected to analog output module 103 by signaling line, is controlled to output to analog output module 103 by the Output pressure calculated.Analog output module 103 is connected to the pressure proportioning valve of Hydraulic System for Injection Moulding Machine 104 to control its aperture by signaling line.Hydraulic System for Injection Moulding Machine 104 is arranged on injection machine 105 corresponding position.The pressure gauge numerical value needing the operative employee of injection machine or technician to read in trimming process injection machine is installed, then this numerical value is input to pressure gamma correction module 102, this module is by the corrected value of correcting process calculating pressure output characteristic point, then by analog output module 103, the Stress control data after correction are outputted to the hydraulic system 104 of injection machine, Hydraulic System for Injection Moulding Machine 104 controls the action of injection machine 105.
This pressure non-linear correction method is divided into following step:
1, pressure correction output module is made directly to export the pressure theory value P of maximum output journey point
max, then directly regulate the amplifier be located in analog output module, until the actual delivery pressure of pressure gauge display equals P
max; Represent that correction completes;
2, according to Hydraulic System for Injection Moulding Machine output area [0, P
max], set several characteristic point, whole Output pressure flow process is divided into several sections of corresponding [0, P
1, P
2... P
k... P
max].For output area 145bar injection machine, generally arrange 7 characteristic points, the non-linear strong area intensive of general selection of choosing of characteristic point is chosen, and non-linear more weak local cocoa amplifies selection range, usually selects [0 in reality, 10,20,30,60,90,120,130,145].If realize not knowing that the nonlinear situation of system can adopt average mark phase method completely, as being set to n section, then every segment limit is spaced apart P
max/ n, whole output area just becomes [0, P
max/ n, 2 × P
max/ n ..., (n-1) × P
max/ n, P
max].
3, choose after system divides is several sections by characteristic point, correct from first paragraph.
First pressure gamma correction module exports the characteristic point pressure value P of first paragraph according to linear conditions
1to control Hydraulic System for Injection Moulding Machine, injection machine shows current actual hydraulic pressure system value P by HYDRAULIC CONTROL SYSTEM pressure gauge
1s, now read this pressure gauge numerical value by operator's feedback method operator, be input to pressure gamma correction module, pressure gamma correction module utilizes formula (a1) to calculate this point correction value:
P
1t＝P
10+P
1-P
1s(a1)
Wherein P
10for the numerical value after original linear output value or correction last time, P
1it is the theoretical pressure value of first Feature point correspondence.If for first time corrects, P
10=P
1, otherwise P
10the P obtained after correcting last time
1t.
By that analogy, if other characteristic points correct, then formula (a2) is utilized to calculate:
P
kt＝P
k0+P
k-P
ks(a2)
Wherein P
k0for the numerical value after original linear output value or correction last time, P
kfor the theoretical pressure value that kth point during division characteristic point is corresponding.If for first time corrects, P
k0=P
k, then P
k0the P obtained after correcting last time
kt.
Pressure gamma correction module 102 corrects the force value of other each characteristic points and maximum value according to the method for step 2.Repeat step 3 when the current actual pressure value that pressure gauge shows is identical with Output pressure setting value, be namely considered as realizing completely the nonlinear compensation of pressure proportioning valve in characteristic point or maximum value.
4, after obtaining the corrected value of whole characteristic point and maximum value, pressure gamma correction module 102 just can according to the correction data according to characteristic point obtained before this and maximum output value, carry out the gamma correction in the actual motion of injection machine in the following manner, and corrected value is delivered to analog output module as real output value, thus the actual delivery pressure of Hydraulic System for Injection Moulding Machine and Output pressure setting value are consistent:
(1) as the pressure output value P of adapted to injection system setting
xsatisfy condition P
k≤ P
x< P
k+1(work as P
kduring for last characteristic point, P
k+1=P
max) time, carry out gamma correction according to formula b:
P=P
kt+ (P
x-P
k) × (P
(k+1) t-P
kt)/(P
k+1-P
k) (formula b)
(2) P is worked as
x< P
1, i.e. P
xbe in the beginning the 1st section of whole Output pressure process interval time, carry out gamma correction in the following manner:
P=P
x× P
1t/ P
k(formula c);
In above-mentioned each formula, P
xthe force value of the injection hydraulic system required for Shooting Technique, i.e. Output pressure setting value; P is calibrated Output pressure setting value, the i.e. real output value of pressure gamma correction module; P
ktfor the Output pressure setting value of a calibrated kth characteristic point; P
kfor the not calibrated Output pressure setting value of a kth characteristic point; P
(k+1) tfor the Output pressure setting value of calibrated kth+1 characteristic point; P
k+1for the not calibrated Output pressure setting value of kth+1 characteristic point.
Based on above-mentioned method of coreection, the present invention can also realize injection hydraulic system pressure and automatically control, and comprises the steps:
When the Data Matching that inputted Shooting Technique requires force value and storage unit to preserve, controller directly calls the real output value of corresponding pressure gamma correction module, and is sent to the aperture control that analog output module carries out pressure proportioning valve;
When inputted Shooting Technique requires that force value is not mated with the data that storage unit is preserved, then carry out calculating pressure real output value by pressure gamma correction module according to formula (b) and formula (c), then analog output module is sent to, by the latter's outputting analog signal to pressure proportioning valve to control its aperture, and finally realize the Stress control of injection hydraulic system.
Below, son is described in detail implementation procedure of the present invention in conjunction with specific embodiments:
The present embodiment exports with hydraulic system gamma correction that pressure maximum is 145bar Hydraulic System for Injection Moulding Machine pressure proportioning valve to illustrate the non-linear correction method of Hydraulic System for Injection Moulding Machine pressure proportioning valve in the present invention realization for example, the gamma correction of the Hydraulic System for Injection Moulding Machine pressure proportioning valve of other types and Output pressure scope, is all deemed to be within the scope of the present invention.
Hydraulic System for Injection Moulding Machine pressure proportioning valve gamma correction segmentation in the present embodiment as shown in Figure 3.7 pressure correction characteristic points are set in Output pressure scope, are respectively P
1(10bar), P
2(20bar), P
3(30bar), P
4(60bar), P
5(90bar), P
6(120bar) and P
7(130bar), in its bracket, force value is the theoretical value of character pair point.Maximum output 145bar is corrected by maximum range, and the main task of this corrective system is exactly the pressure correction value of above-mentioned 7 of acquisition.
The trimming process of pressure proportioning valve maximum output journey point 145bar is: pressure correction output module directly exports the pressure theory value P of maximum output point
max=145bar, is directly regulated the amplifier of pressure simulation output module by user, until actual delivery pressure equals 145bar then represent that correction completes.
Introduce the trimming process of 7 characteristic points below in detail.
First fisrt feature point P is corrected
1(10bar) point.
According to the step introduced in summary of the invention, pressure gamma correction module first according to the force value of linear convergent rate 10bar to Hydraulic System for Injection Moulding Machine, the pressure gauge after Hydraulic System for Injection Moulding Machine action on injection machine can show the actual pressure value P of a hydraulic pressure
1s, now need to read pressure tabular value by P
1s, and be input to pressure gamma correction module by the operation panel picture of man-machine dialogue equipment, suppose P
1sfor 8bar.
Following pressure gamma correction module passes through P
1scalculate P
1the pressure correction value of point.
Formula (a1) is adopted to obtain P
1t=P
10+ P
1-P
1s=10+10-8=12bar.
Now pressure gamma correction module preserves this corrected value P
1tduring for control system for shot machine Output pressure, or first time correct undesirable rear second-order correction and also need to use P
1t.Herein because first time corrects, so P
10for default feature point P
1theoretical value, namely 10bar.
Next P is carried out
2the correction of point.
Pressure gamma correction module exports P
2point pressure 20bar to Hydraulic System for Injection Moulding Machine, injection machine pressure gauge can show current pressure actual value P2s. then by manual feedback by P
2sbe input to pressure gamma correction module, be assumed to be 19bar.Pressure gamma correction module calculates the corrected value of P2 point by formula (a2), now k=2.
P
kt＝P
2t＝P
k0+P
k-P
ks＝P
20+P
2-P
2s＝20+20-19＝21bar。Because first time corrects, P
20=P
2=20bar.
According to above-mentioned identical method calculation correction P
3(30bar), P
4(60bar), P
5(90bar), P
6(120bar) and P
7(130bar) corrected value of 7 characteristic points can be obtained.
The force value that the later pressure gamma correction module 102 of corrected value obtaining each point just can be exported by the correction value actual demand of characteristic point.Suppose the pressure now needing to export 40bar.40bar is positioned at characteristic point P
3(30bar) and P
4(60bar) pressure range scope.Output value after first pressure gamma correction module is corrected by formula (b) calculating pressure.Suppose by P after above-mentioned correction
3t=35bar, P
4t=70bar.
The corrected value utilizing the actual 40bar of output of formula (b) calculating to need is as follows
Pressure gamma correction module 102 obtains the later actual output just can carrying out the 5th step of corrected value P of 40bar.In hypothetical simulation output module 103, DA pio chip is the output of 12 precision, then the digital value that the output value of actual 40bar pressure is corresponding is P/145 × 2
12=659.Pressure gamma correction module 102 outputs to analog output module 103 control DA chip by 659, hydraulic system just can obtain the pressure of 40bar.
The actual effect after correction can be tested after having corrected completely, arrange force value to control control system for shot machine and export corresponding pressure whether observe the display of actual injection machine pressure gauge identical with setting value, if multi-point sampler all meets the demands within the scope of whole Output pressure, gamma correction completes.
If actual injection machine pressure gauge display is not identical with setting value after first time has corrected, then second-order correction can be proceeded.Satisfactory point can not be corrected, and directly correct those also undesirable characteristic points.Suppose first P
1(10bar) also undesirable after correcting, can second-order correction be carried out.Identical with said process, first pressure gamma correction module carries out output P according to the value after first time correction
1(10bar) point pressure 10bar, artificial reading injection machine pressure gauge P
1(10bar) point pressure P
1s, by this pressure incoming pressure gamma correction module, be assumed to be 9bar.
Pressure gamma correction module 102 calculates secondary corrected value by formula (a1).
P
1t＝P
10+P
1-P
1s＝12+10-9＝13bar。Because be not correct first time, so wherein P
10for the numerical value after the correction of last time, and the P after first time correction
1t, be 12bar.
If also have other section undesirable; second-order correction could be carried out equally.
What this method of coreection corrected is theoretical output value, instead of the digital value before the DA output of conventional method.Conventional correction procedure usually number need artificial calculate and constantly examination gather DA export before digital value or magnitude of voltage, this method alleviates the requirement of people to operator greatly.Further, due to the present invention's employing is the mode that manual read gets pressure gauge numeric feedback, does not need manpower intervention to select or calculates, thus can as blanket technological scheme.
It should be understood that; the present invention is not limited to the exact configuration that as above illustrates and describe and method; in the spirit and scope of the present invention that the claim do not deviated from defines, various different change and amendment can be carried out to invention, all be considered to protection scope of the present invention.
Claims (6)
1. the system of the gamma correction of injection hydraulic system pressure Proportional valve, comprises the Hydraulic System for Injection Moulding Machine be arranged on injection machine; Establish pressure proportioning valve in Hydraulic System for Injection Moulding Machine, the outlet of pressure proportioning valve is connected with pressure gauge by pipeline; It is characterized in that, described gamma correction system also comprises:
Start correction module, for the gamma correction process of breakout pressure Proportional valve;
Pressure gamma correction module, the actual pressure numerical value according to pressure gauge corrects pressure output value, and the numerical value after correcting is delivered to analog output module and is used for Stress control;
Analog output module, amplify and outputting analog signal to pressure proportioning valve to control its aperture;
Start correction module to be connected with pressure gamma correction module, pressure gamma correction module, analog output module are connected by signaling line successively with pressure proportioning valve.
2. system according to claim 1, is characterized in that, described analog output module built-in signal amplifier.
3. the method for the gamma correction of injection hydraulic system pressure Proportional valve, is characterized in that, comprise the correction to the characteristic point in pressure proportioning valve output range and the maximum output value of pressure, this process specifically comprises:
(1) first the maximum output journey point of pressure proportioning valve is corrected:
Pressure correction output module is made directly to export the pressure theory value P of maximum output journey point
max, then directly regulate the amplifier be located in analog output module, until the actual delivery pressure of pressure gauge display equals P
max; Represent that correction completes;
(2) within the scope of the Output pressure of Hydraulic System for Injection Moulding Machine, k characteristic point is selected at interval, and whole Output pressure process is divided into k+1 segmentation, and k is the positive integer of 1 ~ 15;
(3) by pressure gamma correction module respectively by the theoretical pressure output value P of this k Feature point correspondence
k 'with Output pressure scope maximum value P
maxas Output pressure setting value, deliver to analog output module for Stress control; Analog output module by analog signal output to pressure proportioning valve to control its aperture, Hydraulic System for Injection Moulding Machine is boosted; Read the current actual pressure value of pressure gauge display, and by its numerical value incoming pressure gamma correction module, utilize formula (a) calculating pressure to export the corrected value P of setting value by pressure gamma correction module
kt, deliver to analog output module as the setting value of second-order correction;
P
kt=P
k0+ P
k-P
ks(formula a)
In formula a, P
ktfor calibrated Output pressure setting value; P
kfor the not calibrated Output pressure setting value for a kth characteristic point, its value equals P
k 'or P
max; P
ksfor the current actual pressure value of hydraulic system of pressure gauge display;
(4) repeat step (3), when the current actual pressure value of pressure gauge display is identical with Output pressure setting value, be namely considered as realizing completely the nonlinear compensation of pressure proportioning valve in characteristic point or maximum value;
Timing for the first time, if the P in formula a
k0=P
kif be repeated and repeatedly correct, P
k0for correcting the rear P obtained last time
kt;
(5) repeat above-mentioned steps (3) and (4), until all k the characteristic points chosen all have corrected, the trimming process of whole injection hydraulic system has terminated.
4. method according to claim 3, it is characterized in that, in injection machine actual moving process after completing correction, pressure gamma correction module is according to the correction data of characteristic point obtained before this and maximum output value, carry out gamma correction in the following manner, and corrected value is delivered to analog output module as real output value, thus the actual delivery pressure of Hydraulic System for Injection Moulding Machine and Output pressure setting value are consistent:
(1) as the pressure output value P of adapted to injection system setting
xsatisfy condition P
k≤ P
x< P
k+1time, carry out gamma correction according to formula b; Work as P
kduring for last characteristic point, P
k+1=P
max;
P=P
kt+ (P
x-P
k) × (P
(k+1) t-P
kt)/(P
k+1-P
k) (formula b)
(2) P is worked as
x< P
1, i.e. P
xbe in the beginning the 1st section of whole Output pressure process interval time, carry out gamma correction in the following manner:
P=P
x× P
1t/ P
k(formula c);
In above-mentioned each formula, P
xthe force value of the injection hydraulic system required for Shooting Technique, i.e. Output pressure setting value; P is calibrated Output pressure setting value, the i.e. real output value of pressure gamma correction module; P
ktfor the Output pressure setting value of a calibrated kth characteristic point; P
kfor the not calibrated Output pressure setting value of a kth characteristic point; P
(k+1) tfor the Output pressure setting value of calibrated kth+1 characteristic point; P
k+1for the not calibrated Output pressure setting value of kth+1 characteristic point.
5. the method according to claim 3 or 4, is characterized in that, for the Hydraulic System for Injection Moulding Machine of Output pressure scope 0 ~ 145bar, the value of k is 5 ~ 8.
6., based on the injection hydraulic line pressure control method of method described in claim 2 to 5 any one, it is characterized in that, comprise the steps:
(1) after the gamma correction at every turn completing pressure proportioning valve, send instruction by man-machine dialog interface to controller, by pressure gamma correction module pressure value corresponding relation data are delivered in the memory module of controller and preserve;
Described pressure value corresponding relation data refer to through repeatedly correcting and corresponding relation data between the force value met required for the real output value of nonlinear compensation required pressure gamma correction module and Shooting Technique and Output pressure setting value;
(2) for new Shooting Technique:
When the Data Matching that inputted Shooting Technique requires force value and storage unit to preserve, controller directly calls the real output value of corresponding pressure gamma correction module, and is sent to the aperture control that analog output module carries out pressure proportioning valve;
When inputted Shooting Technique requires that force value is not mated with the data that storage unit is preserved, then carry out calculating pressure real output value by pressure gamma correction module according to formula (b) and formula (c), then analog output module is sent to, by the latter's outputting analog signal to pressure proportioning valve to control its aperture, and finally realize the Stress control of injection hydraulic system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107387503A (en) * | 2017-07-21 | 2017-11-24 | 中国工程物理研究院化工材料研究所 | Improve the compensator and its application method of hydraulic pressure force loading system linear characteristic |
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| Title |
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| 刘鲁华等: "用设定曲线补偿调节阀特性畸变", 《工业仪表与自动化装置》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107387503A (en) * | 2017-07-21 | 2017-11-24 | 中国工程物理研究院化工材料研究所 | Improve the compensator and its application method of hydraulic pressure force loading system linear characteristic |
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