CN103823370A - Self-adaptive control method for micro-arc oxidation process and system - Google Patents
Self-adaptive control method for micro-arc oxidation process and system Download PDFInfo
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- CN103823370A CN103823370A CN201410036861.5A CN201410036861A CN103823370A CN 103823370 A CN103823370 A CN 103823370A CN 201410036861 A CN201410036861 A CN 201410036861A CN 103823370 A CN103823370 A CN 103823370A
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Abstract
The invention provides a self-adaptive control method for a micro-arc oxidation process and a system. The method comprises the following steps of applying test pulse after normal processing is carried out on micro-arc oxidation for a certain time, identifying electric signals acquired during the test process to obtain film breakdown critical voltage values in the case of different processing times and different film thicknesses, and adjusting power supply output pulse parameters according to the film breakdown critical voltage values obtained after identification and continuing to carry out normal micro-arc oxidation processing according to the adjusted power supply output pulse parameters, wherein the film breakdown critical voltage values comprise breakdown voltage values and breakdown voltage upper limit thresholds. According to the self-adaptive control method for the micro-arc oxidation process and the system, self-adaptive control on the micro-arc oxidation processing process can be realized, film forming effects are effectively improved, the film forming efficiency is enhanced, and a ceramic layer with excellent performances can be obtained.
Description
Technical field
The present invention relates to material surface modifying technology field, particularly relate to a kind of differential arc oxidation process adaptive control method and a kind of differential arc oxidation process adaptive control system.
Background technology
Differential arc oxidation (Micro-arc Oxidation, MAO) is a kind of by the combined action of microplasma discharge and electrolytic solution, at the process for modifying surface of nonferrous metal material surface growth in situ ceramic membrane.Wherein power-supply device is one of key link guaranteeing micro-arc oxidation process, and its output is directly connected to generation, form, distribution and the effect of micro-electric arc, affects the performance of processing procedure energy consumption and rete.More and more about the research of mao power source in recent years, corresponding power technology also has very much progress.
At present mainly contain alternating current source, DC source, pulse direct current source and the Variable Polarity pulse power etc. for the power supply of differential arc oxidation processing.Pulse (Variable Polarity) power supply is owing to allowing electric arc to interrupt, better to the controllability of differential arc oxidation process, processes the film performance obtaining more excellent, thereby is more and more applied.
Aspect power supply architecture, have the anode and cathode of employing respectively independent pressure-adjusting type structure realize the output of many waveforms, also have based on two-stage inversion transformation technique and adopt DSP(Digital Signal Processor, microprocessor) control the output such as the multi-mode that realizes direct current/pulse/Variable Polarity.The advantages such as wherein contravariant structure has that output degree of regulation is high, response is fast, Waveform Control is meticulous, stable output, equipment volume are little, energy-conservation are the developing direction of power technology.
Aspect processing procedure control, mainly contain constant current control model and constant voltage control model.The just control to electrical quantity according to practical experience of the control model of existing power supply, is not implementation process more effectively to be controlled as feedback quantity take load or treatment state, and therefore the procedure parameter of its setting and the rationality of Changing Pattern thereof remain to be discussed.
Learn by practical observation, in differential arc oxidation processing procedure, power source loads presents typical capacitive effect, and the voltage waveform of the actual output of power supply exists conditions of streaking (as shown in Figure 1), makes traditional pulse power cannot realize real high frequency output.The high-frequency high-power differential arc oxidation pulse power in belt discharge gap, while utilizing the absorbing circuit being made up of electronic switch and resistance to output pulse cut-off, the voltage waveform of load end is realized fast-descending, thereby realizes upper frequency (5kHz) output.The method adopts anode and cathode independent pressure-adjusting type structure respectively, aspect Variable Polarity control, loop power control, is having much room for improvement; The absorption circuit adopting just simply discharges load energy, cannot realize the recycling to loop, load energy, and the precision control of power supply and output pulse energy is had much room for improvement.
Summary of the invention
Based on this, the invention provides a kind of differential arc oxidation process adaptive control method and system, can realize the adaptive control to differential arc oxidation processing procedure, thereby effectively improve film-formation result and promote film forming efficiency.
For achieving the above object, the present invention adopts following technical scheme:
A kind of differential arc oxidation process adaptive control method, comprises the following steps:
After the normal process certain hour of differential arc oxidation, apply test pulse;
The electric signal obtaining in test process is carried out to identification, the rete breakdown critical magnitude of voltage while obtaining different disposal time, different thicknesses of layers; Described rete breakdown critical magnitude of voltage comprises breakdown voltage value and voltage breakdown upper limit threshold values;
The rete breakdown critical magnitude of voltage obtaining according to identification is adjusted power supply output pulse parameter, and proceeds the normal process of differential arc oxidation with the power supply output pulse parameter after adjusting.
A kind of differential arc oxidation process adaptive control system, comprising:
Test pulse applies module, after the normal process certain hour at differential arc oxidation, applies test pulse;
Critical voltage value recognition module, carries out identification for the electric signal that test process is obtained, the rete breakdown critical magnitude of voltage while obtaining different disposal time, different thicknesses of layers; Described rete breakdown critical magnitude of voltage comprises breakdown voltage value and voltage breakdown upper limit threshold values;
Parameter adjustment module, adjusts power supply output pulse parameter for the rete breakdown critical magnitude of voltage obtaining according to identification, and proceeds the normal process of differential arc oxidation with the power supply output pulse parameter after adjusting.
Can be found out by above scheme, a kind of differential arc oxidation process adaptive control method of the present invention and system, at after-applied test pulse of normal process a period of time, and rete breakdown critical magnitude of voltage when carrying out on-line identification and obtaining different disposal time, different thicknesses of layers, the rete breakdown critical magnitude of voltage then obtaining according to identification is adjusted power supply output pulse parameter in real time.The present invention realizes the adaptive control to differential arc oxidation processing procedure by the process of " test-identification-self-adjusting " that move in circles, can make electric arc remain fine spark discharge or micro-arc discharge state, make rete can conform the variation of condition all the time in optimum or approach optimum growth conditions, adopt scheme provided by the invention to process, can effectively improve film-formation result, promote film forming efficiency, obtain the ceramic layer of excellent performance.
Accompanying drawing explanation
Fig. 1 is pulse output waveform schematic diagram under capacitive load state;
Fig. 2 is the schematic flow sheet of a kind of differential arc oxidation process adaptive control method of the present invention;
Fig. 3 is a kind of voltage tester timing chart;
Fig. 4 is on-line identification electrical quantity curve synoptic diagram;
Fig. 5 is the structural representation of a kind of differential arc oxidation process adaptive of the present invention control system.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Shown in Figure 2, a kind of differential arc oxidation process adaptive control method, comprises the following steps:
Step S101, after the normal process certain hour of differential arc oxidation, applies test pulse.
As a good embodiment, the test pulse applying in the present invention (comprising the test pulse applying in subsequent step) can be one group of amplitude, frequency and pulsewidth test pulse not etc.
Step S102, carries out identification to the electric signal obtaining in test process, sets up the characterization of relation between electrical quantity and electric arc and rete state, the rete breakdown critical magnitude of voltage while obtaining different disposal time, different thicknesses of layers.
It should be noted that, described rete breakdown critical magnitude of voltage comprises breakdown voltage value and voltage breakdown upper limit threshold values.Wherein, breakdown voltage value refers in processing procedure and makes surface of the work that the needed minimum voltage value of micro-arc discharge phenomenon occur, and voltage breakdown upper limit threshold values refers to that electric arc pattern is changed into the critical voltage of large arc discharge by fine electric spark.
Step S103, the rete breakdown critical magnitude of voltage obtaining according to identification is adjusted power supply output pulse parameter, make electric arc remain fine spark discharge or micro-arc discharge state, make rete can conform the variation of condition all the time in optimum or approach optimum growth conditions, and export pulse parameter and proceed the normal process of differential arc oxidation with the power supply after adjusting.
In the embodiment of the present invention, after normal process a period of time, apply one group of amplitude, frequency and pulsewidth test pulse not etc., pass through voltage sensor simultaneously, current sensor detects sampling to the electric signal of test pulse, the digital signal of sampling feedback is carried out to electric arc and the rete to this moment after Treatment Analysis and carry out electrical quantity identification, after identification, output pulse parameter is carried out to the online electrical quantity that output is applicable to coating growth of adjusting, after continuation processing a period of time, repeat the process of " test-identification-adjustment " (being step S101-step S103), make electric arc remain fine spark discharge or micro-arc discharge state, make rete can conform the variation of condition all the time in optimum or approach optimum growth conditions.As a good embodiment, the present invention, after the power supply output pulse parameter with after adjusting is proceeded the normal process of differential arc oxidation, can also comprise the steps:
Step S104, in the time detecting that current density drops to the critical electric current value while puncturing without rete, continues to apply test pulse; Wherein, the amplitude base value of this test pulse applying is got the breakdown voltage value that last identification obtains.
In the present invention, the processing procedure of differential arc oxidation is " self-adaptation ", and all " test-identification-adjustment " processes are all self-regulating online, does not need human intervention or sets in advance.The time (being " certain hour " in step S101) that applies test pulse in processing procedure determines by detecting electric current or current density value, in the time that electric current or current density value drop to critical electric current value, just applies new test pulse.
Step S105, the rete breakdown critical magnitude of voltage that identification makes new advances, and the rete breakdown critical magnitude of voltage obtaining according to this identification is readjusted power supply output pulse parameter for normal process next time, until magnitude of voltage reaches voltage breakdown upper limit threshold values.
In addition, as a good embodiment, the process of carrying out identification in step S102 of the present invention specifically can comprise as follows:
Step S1021, carries out pre-service to the sampling pulse voltage, the current digital signal that obtain, reduces or eliminates the undesired signal (as high frequency noise) in sampled data, reduces as far as possible truly actual electrical signal;
Step S1022, carries out effective value computing to data after pre-service, obtains the effective value of single test pulse;
Step S1023, determines electric current or current-rising-rate catastrophe point according to described effective value, and this electric current or magnitude of voltage corresponding to current-rising-rate catastrophe point are recognized as to the breakdown voltage value under this state;
Step S1024, if in test pulse voltage range, there is decline flex point in current value after rising flex point, magnitude of voltage corresponding the decline flex point of electric current or current-rising-rate is recognized as to the voltage breakdown upper limit threshold values under this state.
As a good embodiment, in step S1021, described in carry out pretreated process and specifically can comprise: digital filtering is processed and digital smoothness processing etc.
In addition, as a good embodiment, after identification obtains described voltage breakdown upper limit threshold values, can also comprise the steps:
Step S1025, carries out frequency-domain analysis to electric signal, obtains corresponding amplitude-frequency, phase frequency relation, obtains loaded impedance spectrum, identification rete status by the method for numerical fitting.The breakdown voltage value that identification obtains and voltage breakdown upper limit threshold values are adjusted term of reference are provided for pulse parameter is online.
Below by a concrete example, the solution of the present invention is described: sample material 6061Al alloy, specimen size is φ=4mm, electrolytic solution is alkaline sodium silicate solution, PH=11.Initial time applies relative broad range voltage tester pulse parameter: pulsed frequency 500Hz, pulsewidth 1ms, pulse amplitude base value 100V, pulse amplification 10V, pulse amplitude higher limit 450V.The voltage tester pulse signal applying as shown in Figure 3, the test pulse I-V curve that data processing obtains is as shown in Fig. 4 (a), curve exists obvious flex point to can be used for the identification of critical voltage, it is 365V that identification obtains breakdown voltage value, voltage breakdown upper limit threshold values is 430V, and the current density value when puncturing without rete is as applying test pulse whether critical value.After on-line identification finishes, the breakdown voltage value obtaining with identification continues normal process, detects when current density drops to critical electric current value, continues to apply test pulse; Now adding test pulse parameter can suitably adjust, and proportion is higher, pulsewidth is narrower, amplitude base value is got last breakdown voltage value, pulse amplification less (1V).Test pulse data are carried out can obtaining and similarly test pulse I-V curve of Fig. 4 (b) after Treatment Analysis, can recognize new voltage breakdown, automatically adjust pulse output parameter for normal process next time according to identification result.The process of carrying out and so forth " test-identification-self-adjusting ", punctures upper limit threshold values until magnitude of voltage reaches rete, judges that this processing finishes.
The present invention adopts self-adaptation-pid control algorithm to carry out on-line control to output pulse parameter.Due to the mechanism of action difference of positive negative pulse stuffing, the electrical characteristics that load presents are also different, when different arc shapes and rete state, the pid control parameter of required employing is also different, and self-adaptation-pid control algorithm can be realized and power supply output pulse parameter is carried out to self-adjusting accurately control.
It should be noted that, method of the present invention goes for the differential arc oxidation processing of the non-ferrous metals such as aluminium, magnesium, titanium, zirconium and alloy thereof.
Corresponding with above-mentioned a kind of differential arc oxidation process adaptive control method, the present invention also provides a kind of differential arc oxidation process adaptive control system, as shown in Figure 5, comprising:
Test pulse applies module 101, after the normal process certain hour at differential arc oxidation, applies test pulse;
Critical voltage value recognition module 102, carries out identification for the electric signal that test process is obtained, the rete breakdown critical magnitude of voltage while obtaining different disposal time, different thicknesses of layers; Described rete breakdown critical magnitude of voltage comprises breakdown voltage value and voltage breakdown upper limit threshold values;
As a good embodiment, described test pulse applies module 101 and can also be used for, in the time detecting that current density drops to the critical electric current value while puncturing without rete, continuing to apply test pulse; Wherein, the amplitude base value of this test pulse applying is got the breakdown voltage value that last identification obtains.
In addition, described critical voltage value recognition module 102 can also be used for the rete breakdown critical magnitude of voltage that identification makes new advances, and the rete breakdown critical magnitude of voltage obtaining according to this identification is readjusted power supply output pulse parameter for normal process next time, until magnitude of voltage reaches voltage breakdown upper limit threshold values.
As a good embodiment, described critical voltage value recognition module 102 can comprise:
Pretreatment module, carries out pre-service for pulse voltage, current digital signal that sampling is obtained, eliminates the undesired signal in sampled data;
Effective value acquisition module, for data after pre-service are carried out to effective value computing, obtains the effective value of single test pulse;
Breakdown voltage value recognition module, for determine electric current or current-rising-rate catastrophe point according to described effective value, and is recognized as the breakdown voltage value under this state by this electric current or magnitude of voltage corresponding to current-rising-rate catastrophe point;
Voltage breakdown upper limit threshold values recognition module, for in test pulse voltage range, if decline flex point has appearred in current value after rising flex point, magnitude of voltage corresponding the decline flex point of electric current or current-rising-rate is recognized as to the voltage breakdown upper limit threshold values under this state.
As a good embodiment, described critical voltage value recognition module 102 can also comprise:
Rete state recognition module, for obtain described voltage breakdown upper limit threshold values in identification after, carries out frequency-domain analysis to electric signal, obtains corresponding amplitude-frequency, phase frequency relation, obtains loaded impedance spectrum, identification rete status by the method for numerical fitting.
Other technical characterictic of above-mentioned a kind of differential arc oxidation process adaptive control system is identical with a kind of differential arc oxidation process adaptive control method of the present invention, and it will not go into details herein.
Can find out by above scheme, a kind of differential arc oxidation process adaptive control method of the present invention and system, at after-applied test pulse of normal process a period of time, and rete breakdown critical magnitude of voltage when carrying out on-line identification and obtaining different disposal time, different thicknesses of layers, the rete breakdown critical magnitude of voltage then obtaining according to identification is adjusted power supply output pulse parameter in real time.The present invention realizes the adaptive control to differential arc oxidation processing procedure by the process of " processing-identification-self-adjusting " that move in circles, can make electric arc remain fine spark discharge or micro-arc discharge state, make rete can conform the variation of condition all the time in optimum or approach optimum growth conditions, adopt scheme provided by the invention to process, can effectively improve film-formation result, promote film forming efficiency, obtain the ceramic layer of excellent performance.
Unless context separately has the description of specific distinct, the element in the present invention and assembly, the form that quantity both can be single exists, and form that also can be multiple exists, and the present invention does not limit this.Although the step in the present invention is arranged with label, and be not used in and limit the precedence of step, unless expressly stated the order of step or the execution of certain step need other steps as basis, otherwise the relative order of step is adjustable.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a differential arc oxidation process adaptive control method, is characterized in that, comprises the following steps:
After the normal process certain hour of differential arc oxidation, apply test pulse;
The electric signal obtaining in test process is carried out to identification, the rete breakdown critical magnitude of voltage while obtaining different disposal time, different thicknesses of layers; Described rete breakdown critical magnitude of voltage comprises breakdown voltage value and voltage breakdown upper limit threshold values;
The rete breakdown critical magnitude of voltage obtaining according to identification is adjusted power supply output pulse parameter, and proceeds the normal process of differential arc oxidation with the power supply output pulse parameter after adjusting.
2. differential arc oxidation process adaptive control method according to claim 1, is characterized in that, after the power supply output pulse parameter with after adjusting is proceeded the normal process of differential arc oxidation, also comprises step:
In the time detecting that current density drops to the critical electric current value while puncturing without rete, continue to apply test pulse; Wherein, the amplitude base value of this test pulse applying is got the breakdown voltage value that last identification obtains;
The rete breakdown critical magnitude of voltage that identification makes new advances, and the rete breakdown critical magnitude of voltage obtaining according to this identification is readjusted power supply output pulse parameter for normal process next time, until magnitude of voltage reaches voltage breakdown upper limit threshold values.
3. differential arc oxidation process adaptive control method according to claim 1, is characterized in that, the test pulse applying is one group of amplitude, frequency and pulsewidth test pulse not etc.
4. according to the differential arc oxidation process adaptive control method described in claim 1 or 2 or 3, it is characterized in that, described in carry out identification process comprise:
Pulse voltage, current digital signal that sampling is obtained carry out pre-service, eliminate the undesired signal in sampled data;
Data after pre-service are carried out to effective value computing, obtain the effective value of single test pulse;
Determine electric current or current-rising-rate catastrophe point according to described effective value, and this electric current or magnitude of voltage corresponding to current-rising-rate catastrophe point are recognized as to the breakdown voltage value under this state;
If in test pulse voltage range, there is decline flex point in current value after rising flex point, magnitude of voltage corresponding the decline flex point of electric current or current-rising-rate is recognized as to the voltage breakdown upper limit threshold values under this state.
5. differential arc oxidation process adaptive control method according to claim 4, is characterized in that, after identification obtains described voltage breakdown upper limit threshold values, also comprises step:
Electric signal is carried out to frequency-domain analysis, obtain corresponding amplitude-frequency, phase frequency relation, obtain loaded impedance spectrum, identification rete status by the method for numerical fitting.
6. differential arc oxidation process adaptive control method according to claim 4, is characterized in that, described in carry out pretreated process and comprise: digital filtering is processed and digital smoothness processing.
7. a differential arc oxidation process adaptive control system, is characterized in that, comprising:
Test pulse applies module, after the normal process certain hour at differential arc oxidation, applies test pulse;
Critical voltage value recognition module, carries out identification for the electric signal that test process is obtained, the rete breakdown critical magnitude of voltage while obtaining different disposal time, different thicknesses of layers; Described rete breakdown critical magnitude of voltage comprises breakdown voltage value and voltage breakdown upper limit threshold values;
Parameter adjustment module, adjusts power supply output pulse parameter for the rete breakdown critical magnitude of voltage obtaining according to identification, and proceeds the normal process of differential arc oxidation with the power supply output pulse parameter after adjusting.
8. differential arc oxidation process adaptive control system according to claim 7, is characterized in that, described test pulse applies module also in the time detecting that current density drops to the critical electric current value while puncturing without rete, continues to apply test pulse; Wherein, the amplitude base value of this test pulse applying is got the breakdown voltage value that last identification obtains;
The rete breakdown critical magnitude of voltage that described critical voltage value recognition module also makes new advances for identification, and the rete breakdown critical magnitude of voltage obtaining according to this identification is readjusted power supply output pulse parameter for normal process next time, until magnitude of voltage reaches voltage breakdown upper limit threshold values.
9. according to the differential arc oxidation process adaptive control system described in claim 7 or 8, it is characterized in that, described critical voltage value recognition module comprises:
Pretreatment module, carries out pre-service for pulse voltage, current digital signal that sampling is obtained, eliminates the undesired signal in sampled data;
Effective value acquisition module, for data after pre-service are carried out to effective value computing, obtains the effective value of single test pulse;
Breakdown voltage value recognition module, for determine electric current or current-rising-rate catastrophe point according to described effective value, and is recognized as the breakdown voltage value under this state by this electric current or magnitude of voltage corresponding to current-rising-rate catastrophe point;
Voltage breakdown upper limit threshold values recognition module, for in test pulse voltage range, if decline flex point has appearred in current value after rising flex point, magnitude of voltage corresponding the decline flex point of electric current or current-rising-rate is recognized as to the voltage breakdown upper limit threshold values under this state.
10. differential arc oxidation process adaptive control system according to claim 9, is characterized in that, described critical voltage value recognition module also comprises:
Rete state recognition module, for obtain described voltage breakdown upper limit threshold values in identification after, carries out frequency-domain analysis to electric signal, obtains corresponding amplitude-frequency, phase frequency relation, obtains loaded impedance spectrum, identification rete status by the method for numerical fitting.
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| CN112630296A (en) * | 2020-11-27 | 2021-04-09 | 南京肯特复合材料股份有限公司 | Method for rapidly detecting density of aluminum anodic oxide film layer |
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| CN111647924A (en) * | 2020-06-09 | 2020-09-11 | 南京工业大学 | On-line monitoring system for micro-arc oxidation film forming process |
| CN111647924B (en) * | 2020-06-09 | 2021-08-20 | 南京工业大学 | On-line monitoring system for micro-arc oxidation film forming process |
| CN112630296A (en) * | 2020-11-27 | 2021-04-09 | 南京肯特复合材料股份有限公司 | Method for rapidly detecting density of aluminum anodic oxide film layer |
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