CN106808035A - Electrical discharge machining self-adaptation control method, apparatus and system - Google Patents
Electrical discharge machining self-adaptation control method, apparatus and system Download PDFInfo
- Publication number
- CN106808035A CN106808035A CN201611101984.8A CN201611101984A CN106808035A CN 106808035 A CN106808035 A CN 106808035A CN 201611101984 A CN201611101984 A CN 201611101984A CN 106808035 A CN106808035 A CN 106808035A
- Authority
- CN
- China
- Prior art keywords
- discharge condition
- time sequence
- reference value
- interval
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The present invention provides a kind of electrical discharge machining self-adaptation control method, apparatus and system, belongs to EDM Technology field.Method includes：Based on current time sequence of points, according to the discharge condition value in upper time sequence of interval, discharge condition fluctuating range is calculated；Based on the first numerical relationship model, the discharge condition reference value of future time sequence of interval is calculated；Based on the second numerical relationship model, the discharge condition fluctuating range reference value of future time sequence of interval is calculated；The discharge condition value of predetermined number time series point, the control signal of future time sequence of points is calculated according to Self Adaptive Control mode before the discharge condition value and current time sequence of points of discharge condition reference value, current time sequence of points according to future time sequence of interval；Based on control signal, next cutter lifting cycle of electric spark machine tool is obtained.Due to can real-time adjustment discharge condition reference value, in any scope, and then the uniformity of finished surface can be improved so as to by the control of discharge condition fluctuating range.
Description
Technical field
The present invention relates to EDM Technology field, more particularly, to a kind of electrical discharge machining self-adaptation control method, dress
Put and system.
Background technology
With the development of EDM Technology, electrical discharge machining because machining accuracy is high and the low outstanding advantages of manufacturing cost,
It is widely used aborning.Edm process is a weak steady-state process, if rushing oil or row in process
Harsh conditions are considered to be worth doing, system can enter unstable state and discharge condition fluctuation is increased, so as to cause burned work-surface, influence to add
Work efficiency rate.Therefore, how to control electrical discharge machining is a key issue.Existing electrical discharge machining self-adaptation control method is main
It is, according to fixed discharge condition reference value, control signal to be obtained by Self Adaptive Control mode, so as to according to control signal pair
The cutter lifting cycle of lathe is adjusted, and realizes the Self Adaptive Control to electrical discharge machining.
Realize it is of the invention during, find prior art at least there is problems with：Due to being to allow discharge condition to chase after
The discharge condition reference value that track is fixed, i.e., be adjusted according to fixed discharge condition reference value to the cutter lifting cycle, and processes
Condition is dynamic change, and as processing conditions is deteriorated, discharge condition fluctuating range can also be increased therewith, so that self-adaptive controlled
System processed enters unstable state, and then causes harmful processing infringement workpiece even more so that Self Adaptive Control is failed.
The content of the invention
The present invention provides one kind and overcomes above mentioned problem or at least in part solution to the problems described above, device and be
System.
According to the first aspect of the invention, there is provided a kind of electrical discharge machining self-adaptation control method, the method includes：
Based on current time sequence of points, according to the discharge condition value in upper time sequence of interval, corresponding electric discharge is calculated
State fluctuating range；
Based on the first numerical relationship model, according to the electric discharge shape in discharge condition fluctuating range, upper time sequence of interval
Discharge condition reference value in state fluctuating range reference value and upper time sequence of interval, calculates putting for future time sequence of interval
Electricity condition reference value；
Based on the second numerical relationship model, the discharge condition reference value according to future time sequence of interval calculates lower a period of time
Between sequence of interval discharge condition fluctuating range reference value；
The discharge condition value of discharge condition reference value, current time sequence of points according to future time sequence of interval and current
The discharge condition value of predetermined number time series point, future time is calculated according to Self Adaptive Control mode before time series point
The control signal of sequence of points；
Based on the control signal of future time sequence of points, next cutter lifting cycle of electric spark machine tool is obtained.
According to the second aspect of the invention, there is provided a kind of electrical discharge machining adaptive controller, the device includes：Put
Electricity condition fluctuating range control module, self-adaptive control module and electric spark machine tool；
Discharge condition fluctuating range control module, for calculating discharge condition reference value based on the first numerical relationship model,
Discharge condition fluctuating range reference value is calculated based on the second numerical relationship model；
Self-adaptive control module, for according to discharge condition reference value, the discharge condition value of current time sequence of points and work as
The discharge condition value of predetermined number time series point before preceding time series point, calculates control signal, is obtained according to control signal
Take the corresponding cutter lifting cycle；
Electric spark machine tool, for being modified to the upper cutter lifting cycle according to the cutter lifting cycle, realizes electrical discharge machining
Self Adaptive Control.
According to the third aspect of the invention we, there is provided a kind of electrical discharge machining adaptive control system, the system includes：Put
Electricity condition identification unit, parameter identification unit, discharge condition fluctuating range calculator, discharge condition are with reference to value controller, electric discharge
State fluctuation amplitude controller, adaptive controller, cutter lifting computation of Period unit and electric spark machine tool；
Discharge condition identification unit, for the discharge condition value of on-line identification sampled point, and by the discharge condition of sampled point
Value passes to parameter identification unit, adaptive controller and discharge condition fluctuating range calculator.
Parameter identification unit, for the discharge condition value according to obtained by identification, distinguishes to EDM model parameter
Know, the model parameter of identification is passed into adaptive controller；
Discharge condition fluctuating range calculator, for according to the discharge condition value in upper time series interval, calculating
Corresponding discharge condition fluctuating range, and discharge condition fluctuating range is passed into discharge condition refer to value controller；
Discharge condition refers to value controller, for according to putting in discharge condition fluctuating range, upper time sequence of interval
Discharge condition fluctuating range reference value in electricity condition reference value and upper time sequence of interval, calculates future time sequence of interval
Interior discharge condition reference value, and discharge condition reference value is passed into adaptive controller and the control of discharge condition fluctuating range
Device；
Discharge condition fluctuating range controller, for according to the discharge condition reference value in future time sequence of interval, meter
The discharge condition fluctuating range reference value in future time sequence of interval is calculated, by the discharge condition ripple in future time sequence of interval
Dynamic amplitude reference value passes to discharge condition and refers to value controller；
Adaptive controller, for according to the discharge condition reference value in future time sequence of interval, current time sequence
The discharge condition value of predetermined number time series point before the discharge condition value and current time sequence of points of point, calculates control letter
Number, and control signal is passed into cutter lifting computation of Period unit；
Cutter lifting computation of Period unit, for based on control signal, obtaining the cutter lifting cycle, and passes to electric fire by the cutter lifting cycle
Flower machining tool；
Electric spark machine tool, for being modified to the upper cutter lifting cycle according to the cutter lifting cycle, realizes electrical discharge machining
Self Adaptive Control.
The beneficial effect brought of technical scheme that the application is proposed is：
By according to the discharge condition value in upper time sequence of interval, calculating corresponding discharge condition fluctuating range.Base
In the first numerical relationship model, according to the discharge condition fluctuating range in discharge condition fluctuating range, upper time sequence of interval
Discharge condition reference value in reference value and upper time sequence of interval, calculates the discharge condition reference of future time sequence of interval
Value.Based on the second numerical relationship model, the discharge condition reference value according to future time sequence of interval calculates future time sequence
Interval discharge condition fluctuating range reference value.Discharge condition reference value, current time sequence according to future time sequence of interval
The discharge condition value of predetermined number time series point before arranging the discharge condition value and current time sequence of points of point, according to adaptive
Control mode is answered to calculate the control signal of future time sequence of points.Based on the control signal of future time sequence of points, electricity fire is obtained
Next cutter lifting cycle of flower machining tool.Due to reality can be carried out to discharge condition reference value and discharge condition fluctuating range reference value
When adjust such that it is able to by the control of discharge condition fluctuating range in any scope, and then the consistent of finished surface can be improved
Property.
Simultaneously, additionally it is possible to the stability of electric spark adaptive machining is maintained in the working solution of different electrical conductivity.Especially
Under the conditions of forceful electric power conductance working fluid, such as deionization is insufficient, by the control to discharge condition fluctuating range, electrical conductivity compared with
Also electrical spark working can be capable of achieving in working fluid high by the stability maintenance of electrical discharge machining Adaptable System in preferable degree
The robustness of work Self Adaptive Control, and working ability and efficiency can be improved.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of electrical discharge machining self-adaptation control method of the embodiment of the present invention；
Fig. 2 is a kind of schematic flow sheet of electrical discharge machining self-adaptation control method of the embodiment of the present invention；
Fig. 3 is a kind of processing effect schematic diagram of the embodiment of the present invention；
Fig. 4 is a kind of processing effect schematic diagram of the embodiment of the present invention；
Fig. 5 is a kind of processing effect schematic diagram of the embodiment of the present invention；
Fig. 6 is a kind of structural representation of electrical discharge machining adaptive control system of the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the invention is described in further detail.Hereinafter implement
Example is not limited to the scope of the present invention for illustrating the present invention.
When electrical discharge machining is using two interpolar pulsed discharge being immersed in working solution, the galvanic action ablation of generation is conductive
The special process method of material, also known as electro-discharge machining or galvanic corrosion, English abbreviation EDM (Electrical Discharge
Machining, electrical discharge machining).
Wherein, edm process is a weak steady-state process, i.e., in effective process segment, its linear characteristic is for example equal
Value, variance or energy spectrum etc. fluctuate in the range of a very little.If occurring punching oil in process or chip removal situation being disliked
Situations such as bad, then harmful processing occurs and workpiece is damaged.The appearance of harmful processing, can make electrical discharge machining Self Adaptive Control
System enters unstable state.Correspondingly, discharge condition fluctuation increases the processed workpiece surface that can burn, so as to influence processing
Efficiency.
In order to avoid be harmful to processing appearance, effective method be by change the servo motion parameter in process or
Energy parameter, on the premise of machining accuracy is not influenceed, makes processing come back to effective process segment from harmful process segment.Or
Person, by changing servo motion parameter or discharge parameter in advance, it is to avoid be machined into harmful process segment.To reach this mesh
, effective closed-loop control system can be set up.The control system can be in process discharge condition value, in real time change
Servo motion parameter or discharge parameter, so that process maintains effective process segment, and improve processing efficiency.
In order to describe the interpolar discharge state of electrical discharge machining, the interpolar discharge state of electrical discharge machining can be determined
Justice.In view of the arcing defencive function of electric spark machine tool, arteries and veins can be harmful to using stable state arcing rate and short-circuit ratio sum
Existing probability is gone out to reflect the interpolar discharge state corresponding to different machining status.Meanwhile, in the present embodiment according to reality
Situation can contrast ratio make appropriate change, redefine as follows, interpolar discharge state=(short-circuit number+stable state arcing number)/(spark
Discharge count+transient state arcing number+short circuit number+stable state arcing number).Above-mentioned calculating process can be shown in equation below (1)：
R=(τshort+τstab.arc)/(τspark+τtran.arc+τstab.arc+τshort) (1)
Wherein, r is interpolar discharge state.τsparkIt is the sampling accumulated quantity of spark pulse in the unit time, τtran.arcFor
The sampling accumulated quantity of transient state arcing pulse, τ in unit intervalstab.arcFor the sampling of unit time homeostasis arcing pulse adds up
Quantity, τshortIt is the sampling accumulated quantity of unit time internal short-circuit pulse.
For the problem for harmful processing occur, existing electrical discharge machining self-adaptation control method is mainly what foundation was fixed
Discharge condition reference value, control signal is obtained by Self Adaptive Control mode, so as to all to the cutter lifting of lathe according to control signal
Phase is adjusted, and realizes the Self Adaptive Control to electrical discharge machining.
However, processing conditions is typically dynamic change in edm process.As processing conditions is deteriorated, electric discharge
State fluctuating range can be increased therewith.When will particularly enter harmful process segment, discharge condition fluctuating range can increase suddenly
Greatly.Adaptive control system with discharge condition as monitor control index can produce concussion in output control variable, and further add
Big short circuit and the occurrence probability of arcing pulse, so as to cause harmful processing infringement workpiece, cause electrical discharge machining Self Adaptive Control
System cannot play the working ability of maximum even more so that Self Adaptive Control is failed.
For the problems of the prior art, a kind of electrical discharge machining self-adaptation control method is present embodiments provided.Referring to
Fig. 1,101, based on current time sequence of points, according to the discharge condition value in upper time sequence of interval, calculate corresponding electric discharge
State fluctuating range；102nd, based on the first numerical relationship model, according in discharge condition fluctuating range, upper time sequence of interval
Discharge condition fluctuating range reference value and upper time sequence of interval in discharge condition reference value, calculate future time sequence
Interval discharge condition reference value；103rd, based on the second numerical relationship model, according to the discharge condition of future time sequence of interval
Reference value, calculates the discharge condition fluctuating range reference value of future time sequence of interval；104th, according to future time sequence of interval
Discharge condition reference value, the discharge condition value of current time sequence of points and current time sequence of points before the predetermined number time
The discharge condition value of sequence of points, the control signal of future time sequence of points is calculated according to Self Adaptive Control mode；105th, it is based on down
The control signal of one time sequence of points, obtains next cutter lifting cycle of electric spark machine tool.
Method provided in an embodiment of the present invention, by the way that according to the discharge condition value in upper time sequence of interval, it is right to calculate
The discharge condition fluctuating range answered.Based on the first numerical relationship model, according to discharge condition fluctuating range, sequence area of the upper time
Discharge condition reference value in interior discharge condition fluctuating range reference value and upper time sequence of interval, calculates future time
The discharge condition reference value of sequence of interval.Based on the second numerical relationship model, according to the discharge condition of future time sequence of interval
Reference value, calculates the discharge condition fluctuating range reference value of future time sequence of interval.According to putting for future time sequence of interval
Electricity condition reference value, the discharge condition value of current time sequence of points and predetermined number time series before current time sequence of points
The discharge condition value of point, the control signal of future time sequence of points is calculated according to Self Adaptive Control mode.Based on future time sequence
The control signal of point is arranged, next cutter lifting cycle of electric spark machine tool is obtained.Due to can be to discharge condition reference value and electric discharge
State fluctuation amplitude reference value carries out real-time adjustment such that it is able to by the control of discharge condition fluctuating range in any scope, enter
And the uniformity of finished surface can be improved.
Simultaneously, additionally it is possible to the stability of electric spark adaptive machining is maintained in the working solution of different electrical conductivity.Especially
Under the conditions of forceful electric power conductance working fluid, such as deionization is insufficient, by the control to discharge condition fluctuating range, electrical conductivity compared with
Also electrical spark working can be capable of achieving in working fluid high by the stability maintenance of electrical discharge machining Adaptable System in preferable degree
The robustness of work Self Adaptive Control, and working ability and efficiency can be improved.
As a kind of alternative embodiment, according to the discharge condition value in upper time sequence of interval, corresponding electric discharge is calculated
Before state fluctuating range, also include：
The discharge condition value in upper time sequence of interval that acquisition is prestored.
As a kind of alternative embodiment, according to the discharge condition value in upper time sequence of interval, corresponding electric discharge is calculated
State fluctuating range, including：
The variance yields corresponding to the discharge condition value in upper time sequence of interval is calculated, variance yields is put as corresponding
Electricity condition fluctuating range.
Used as a kind of alternative embodiment, the first numerical relationship model is discharge condition fluctuating range, discharge condition fluctuation width
Linearly or nonlinearly numerical relationship model between degree reference value and discharge condition reference value；
Second numerical relationship model for linear between discharge condition reference value and discharge condition fluctuating range reference value or
Nonlinear mathematicses relational model.
Used as a kind of alternative embodiment, Self Adaptive Control mode includes that advanced three steps PREDICTIVE CONTROL mode, super first two steps are pre-
The Self Adaptive Control that survey control mode, the minimum variance predictive control mode of jump ahead or minimum variance are coupled with reference model
Mode.
As a kind of alternative embodiment, based on the control signal of future time sequence of points, electric spark machine tool is obtained
Next cutter lifting cycle, including：
According to the mapping relations between control signal and cutter lifting cycle, the control signal of future time sequence of points is mapped as
Next cutter lifting cycle of electric spark machine tool.
Above-mentioned all optional technical schemes, can form alternative embodiment of the invention, herein no longer using any combination
Repeat one by one.
Based on the content that above-mentioned Fig. 1 correspondence embodiments are provided, a kind of electrical discharge machining is the embodiment of the invention provides certainly
Adaptive control method.Referring to Fig. 2, the method flow that the present embodiment is provided includes：201st, based on current time sequence of points, according to upper
Discharge condition value in one time sequence of interval, calculates corresponding discharge condition fluctuating range；202nd, based on the first mathematical relationship
Model, according to the discharge condition fluctuating range reference value in discharge condition fluctuating range, upper time sequence of interval and upper a period of time
Between discharge condition reference value in sequence of interval, calculate the discharge condition reference value of future time sequence of interval；203rd, based on
Two numerical relationship models, the discharge condition reference value according to future time sequence of interval calculates putting for future time sequence of interval
Electricity condition fluctuating range reference value；204th, according to future time sequence of interval discharge condition reference value, current time sequence of points
Discharge condition value and current time sequence of points before predetermined number time series point discharge condition value, according to self-adaptive controlled
Mode processed calculates the control signal of future time sequence of points；205th, according to the mapping relations between control signal and cutter lifting cycle,
The control signal of future time sequence of points is mapped as next cutter lifting cycle of electric spark machine tool.
Wherein, 201, based on current time sequence of points, according to the discharge condition value in upper time sequence of interval, it is right to calculate
The discharge condition fluctuating range answered.
Before this step is performed, on the basis of current time sequence of points, the time in current time sequence of points can be obtained
Discharge condition value in sequence of interval, the present embodiment is not especially limited to this.Wherein, time series length of an interval degree can be with root
Set according to demand, the present embodiment is not especially limited to this.If for example, current time sequence of points is the 3rd time series
Point and upper time series interval are the 1st time series o'clock to the 3rd time series point, then time series length of an interval degree
It is 2.
In addition, the discharge condition value for obtaining of being sampled according to upper time sequence of interval, calculates corresponding discharge condition
Before fluctuating range, the discharge condition value for obtaining of being sampled in upper time sequence of interval can also be stored in advance.When need
When calculating discharge condition fluctuating range, the discharge condition value in the upper time sequence of interval for prestoring, this reality can be obtained
Example is applied to be not especially limited this.
On according to the discharge condition value in upper time sequence of interval, calculating the side of corresponding discharge condition fluctuating range
Formula, the present embodiment is not especially limited to this, including but not limited to：Calculate the discharge condition value institute in upper time sequence of interval
Corresponding variance yields, using variance yields as corresponding discharge condition fluctuating range.
Wherein, 202, based on the first numerical relationship model, according in discharge condition fluctuating range, upper time sequence of interval
Discharge condition fluctuating range reference value and upper time sequence of interval in discharge condition reference value, calculate future time sequence
Interval discharge condition reference value.
Electrical discharge machining is typically to make electrode do periodically reciprocating motion, referred to as cutter lifting motion along processing direction of feed.
Correspondingly, cutter lifting motion correspond to the cutter lifting cycle.In addition, the first numerical relationship model is discharge condition fluctuating range, electric discharge shape
Linearly or nonlinearly numerical relationship model between state fluctuating range reference value and discharge condition reference value, the present embodiment to this not
Make specific restriction.
It should be noted that from the interval definition of the squadron's time series of above-mentioned steps 201, next time series area
Between be that, with current time sequence of points as starting point, siding-to-siding block length is interval for the time series of preset length.If for example, current time
Sequence of points is the 3rd time series point and siding-to-siding block length is 2, then next time series is interval for the 3rd time series point is arrived
5th time series point.
Wherein, 203, based on the second numerical relationship model, the discharge condition reference value according to future time sequence of interval, meter
Calculate the discharge condition fluctuating range reference value of future time sequence of interval.
From above-mentioned steps 202, when the discharge condition reference value in next time series interval is calculated, it is necessary to use
The interval discharge condition fluctuating range reference value of a upper time series, so as to next time sequence can be calculated in the present embodiment
Interval discharge condition fluctuating range reference value is arranged, for the discharge condition reference value that next time series under calculating is interval,
The present embodiment is not especially limited to this.In addition, the second numerical relationship model is discharge condition reference value being fluctuated with discharge condition
Linearly or nonlinearly numerical relationship model between amplitude reference value, the present embodiment is also not especially limited to this.
Wherein, 204, the discharge condition reference value according to future time sequence of interval, the electric discharge shape of current time sequence of points
The discharge condition value of predetermined number time series point before state value and current time sequence of points, according to Self Adaptive Control mode meter
Calculate the control signal of future time sequence of points.
Wherein, Self Adaptive Control mode can be advanced three steps PREDICTIVE CONTROL mode, advanced two-staged prediction control mode, surpass
The Self Adaptive Control mode that the minimum variance predictive control mode or minimum variance of back are coupled with reference model, the present embodiment
This is not especially limited.
Wherein, 205, according to the mapping relations between control signal and cutter lifting cycle, by the control of future time sequence of points
Signal is mapped as next cutter lifting cycle of electric spark machine tool.
Wherein, mapping relations can be linearly or nonlinearly mapping relations, or piecewise function mapping relations, this reality
Example is applied to be not especially limited this.
Based on above-mentioned electrical discharge machining processing procedure, now by the processing effect corresponding to prior art and present invention offer
Processing effect corresponding to electrical discharge machining self-adaptation control method is compared.Fig. 3 is prior art compared with poor conductivity work
Make the processing effect figure under the conditions of liquid, it can be seen that the cutter lifting cycle carries out accommodation in the change according to discharge condition.
The low part of discharge condition fluctuating range, the cutter lifting cycle correspondingly adjusts in a small range.Once there is instantaneous high discharge state,
The cutter lifting cycle is reduced to minimum setting value and can continue for some time at once, so as to improve cutter lifting frequency to accelerate chip removal.Due to
Working fluid electrical conductivity is low, and fully, process is substantially all in effective process segment for the deionization after electric discharge.All in all, put
Electricity condition fluctuating range is maintained within a certain range.But as the increase fluctuating range of working depth is persistently slowly increased, always
30mm is reached to working depth.From this, prior art disclosure satisfy that the stable processing request in poor conductivity working fluid.
Fig. 4 is processing effect figure of the prior art in compared with forceful electric power conductance working solution, it can be seen that the intensive journey of discharge condition
Degree substantially increases compared with Fig. 3.This means in the processing environment shown in Fig. 4, discharge condition fluctuating range is significantly greater than shown in Fig. 3
Processing environment.In whole process, hence it is evident that find out that discharge condition fluctuating range increases and increases with working depth.Due to
Working fluid electrical conductivity is higher, and electric discharge post-processing liquid deionization is not abundant enough, easily produces arcing, thus when discharge condition fluctuation width
When degree exceedes certain limit, one section of discharge condition higher (having a certain degree of arcing before 5000 points of abscissa) is caused.
Now, working depth is 15mm.The reason for causing this phenomenon is that working fluid deionization is insufficient, causes the cutter lifting cycle to drop to
Minimum value promotes working fluid breakdown strength to recover to reduce discharge time.With continuing for process, this phenomenon can the cycle
Property produce (after 5000 points of abscissa, 17mm at second appearance).When working depth reaches 19mm, due to chip removal condition
It is deteriorated and deionization is insufficient, can now causes arcing and stop processing.To sum up, prior art is in the poor situation of working fluid
The effect of its stabilization processing cannot be completely played down.
But based on electrical discharge machining self-adaptation control method provided in an embodiment of the present invention, corresponding processing effect figure can
As shown in Figure 5.Fig. 5 is the processing effect figure using the method for providing of the invention under the conditions of high conductance working fluid.From Fig. 5
In as can be seen that with the increase of working depth, the variation of chip removal condition, discharge condition fluctuating range reduces therewith, cutter lifting week
Phase is also with the reduction that discharge condition fluctuation is slow but stable.When working depth reaches 21mm, because working solution deionization is not filled
Point, occur in that fluctuating widely for one section of discharge condition.Now, discharge condition reference value and discharge condition fluctuating range reference value
Rapid decrease, discharge condition fluctuating range is controlled in very low range and the appearance of arcing is prevented, and makes working depth one straight
Row arrives 24mm.At this moment because chip removal condition and working solution deionization are insufficient so that discharge condition fluctuating range far surpasses electric discharge shape
State fluctuating range reference value, so as to cause arcing to stop processing.This explanation in this embodiment, the control of control system of the present invention
Ability is played completely, and working ability improves 26.3% compared with prior art under poor processing environment, improves processing energy
Power.
Method provided in an embodiment of the present invention, by the way that according to the discharge condition value in upper time sequence of interval, it is right to calculate
The discharge condition fluctuating range answered.Based on the first numerical relationship model, according to discharge condition fluctuating range, sequence area of the upper time
Discharge condition reference value in interior discharge condition fluctuating range reference value and upper time sequence of interval, calculates future time
The discharge condition reference value of sequence of interval.Based on the second numerical relationship model, according to the discharge condition of future time sequence of interval
Reference value, calculates the discharge condition fluctuating range reference value of future time sequence of interval.According to putting for future time sequence of interval
Electricity condition reference value, the discharge condition value of current time sequence of points and predetermined number time series before current time sequence of points
The discharge condition value of point, the control signal of future time sequence of points is calculated according to Self Adaptive Control mode.According to control signal with
Mapping relations between the cutter lifting cycle, the control signal of future time sequence of points is mapped as next lift of electric spark machine tool
The knife cycle.Due to real-time adjustment can be carried out to discharge condition reference value and discharge condition fluctuating range reference value such that it is able to will
Discharge condition fluctuating range is controlled in any scope, and then can improve the uniformity of finished surface.
Simultaneously, additionally it is possible to the stability of electric spark adaptive machining is maintained in the working solution of different electrical conductivity.Especially
Under the conditions of forceful electric power conductance working fluid, such as deionization is insufficient, by the control to discharge condition fluctuating range, electrical conductivity compared with
Also by the stability maintenance of electrical discharge machining Adaptable System in preferable degree, and processing can be improved in working fluid high
Ability and efficiency.
A kind of electrical discharge machining adaptive controller is the embodiment of the invention provides, the device is used to perform above-mentioned Fig. 1
Or the electrical discharge machining self-adaptation control method provided in the corresponding embodiments of Fig. 2.The device includes：Discharge condition fluctuation width
Degree control module, self-adaptive control module and electric spark machine tool.
Wherein, discharge condition fluctuating range control module, for calculating discharge condition ginseng based on the first numerical relationship model
Value is examined, discharge condition fluctuating range reference value is calculated based on the second numerical relationship model.Specifically, discharge condition fluctuating range control
Molding block is used to perform the process in the corresponding embodiments of above-mentioned Fig. 2 in step 201 to step 203.
Self-adaptive control module, for according to discharge condition reference value, the discharge condition value of current time sequence of points and work as
The discharge condition value of predetermined number time series point before preceding time series point, calculates control signal, is obtained according to control signal
Take the corresponding cutter lifting cycle.Specifically, self-adaptive control module be used to perform in the corresponding embodiments of above-mentioned Fig. 2 step 204 with
Process in step 205.
Electric spark machine tool, for being modified to the upper cutter lifting cycle according to the cutter lifting cycle, realizes electrical discharge machining
Self Adaptive Control.
Device provided in an embodiment of the present invention, by the way that according to the discharge condition value in upper time sequence of interval, it is right to calculate
The discharge condition fluctuating range answered.Based on the first numerical relationship model, according to discharge condition fluctuating range, sequence area of the upper time
Discharge condition reference value in interior discharge condition fluctuating range reference value and upper time sequence of interval, calculates future time
The discharge condition reference value of sequence of interval.Based on the second numerical relationship model, according to the discharge condition of future time sequence of interval
Reference value, calculates the discharge condition fluctuating range reference value of future time sequence of interval.According to putting for future time sequence of interval
Electricity condition reference value, the discharge condition value of current time sequence of points and predetermined number time series before current time sequence of points
The discharge condition value of point, the control signal of future time sequence of points is calculated according to Self Adaptive Control mode.Based on future time sequence
The control signal of point is arranged, next cutter lifting cycle of electric spark machine tool is obtained.Due to can be to discharge condition reference value and electric discharge
State fluctuation amplitude reference value carries out real-time adjustment such that it is able to by the control of discharge condition fluctuating range in any scope, enter
And the uniformity of finished surface can be improved.
Simultaneously, additionally it is possible to the stability of electric spark adaptive machining is maintained in the working solution of different electrical conductivity.Especially
Under the conditions of forceful electric power conductance working fluid, such as deionization is insufficient, by the control to discharge condition fluctuating range, electrical conductivity compared with
Also electrical spark working can be capable of achieving in working fluid high by the stability maintenance of electrical discharge machining Adaptable System in preferable degree
The robustness of work Self Adaptive Control, and working ability and efficiency can be improved.
A kind of electrical discharge machining adaptive control system is the embodiment of the invention provides, the system is used to perform above-mentioned Fig. 1
Or the electrical discharge machining self-adaptation control method provided in the corresponding embodiments of Fig. 2.Referring to Fig. 6, the system includes electric discharge shape
State identification unit 601, parameter identification unit 602, discharge condition fluctuating range calculator 603, discharge condition refer to value controller
604th, discharge condition fluctuating range controller 605, adaptive controller 606, cutter lifting computation of Period unit 607 and electrical discharge machining
Lathe 608.
Discharge condition identification unit 601, for the discharge condition value of on-line identification sampled point, and by the electric discharge shape of sampled point
State value passes to parameter identification unit 602, adaptive controller 606 and discharge condition fluctuating range calculator 603.
Parameter identification unit 602, for the discharge condition value according to obtained by identification, is carried out to EDM model parameter
Identification, adaptive controller 606 is passed to by the model parameter of identification；
Discharge condition fluctuating range calculator 603, for according to the discharge condition value in upper time series interval, meter
Corresponding discharge condition fluctuating range is calculated, and discharge condition fluctuating range is passed into discharge condition with reference to value controller 604；
Discharge condition refers to value controller 604, for according in discharge condition fluctuating range, upper time sequence of interval
Discharge condition fluctuating range reference value in discharge condition reference value and upper time sequence of interval, calculates future time sequence area
Interior discharge condition reference value, and discharge condition reference value is passed into adaptive controller 606 and discharge condition fluctuation width
Degree controller 605；
Discharge condition fluctuating range controller 605, for according to the discharge condition reference value in future time sequence of interval,
The discharge condition fluctuating range reference value in future time sequence of interval is calculated, by the discharge condition in future time sequence of interval
Fluctuating range reference value passes to discharge condition with reference to value controller 604；
Adaptive controller 606, for according to the discharge condition reference value in future time sequence of interval, current time sequence
The discharge condition value of predetermined number time series point, calculates control before arranging the discharge condition value and current time sequence of points of point
Signal, and control signal is passed into cutter lifting computation of Period unit 607；
Cutter lifting computation of Period unit 607, for based on control signal, obtaining the cutter lifting cycle, and the cutter lifting cycle is passed to
Electric spark machine tool；
Electric spark machine tool 608, for being modified to the upper cutter lifting cycle according to the cutter lifting cycle, realizes electrical spark working
The Self Adaptive Control of work.
Further, since the discharge condition reference value for calculating next time series point needs to use a time series point
Discharge condition fluctuating range reference value so that discharge condition fluctuating range controller 605 can be controlled to discharge condition reference value
Device 604 transmits discharge condition fluctuating range reference value.
Correspondingly, discharge condition refers to value controller 604, for according to discharge condition fluctuating range and a upper time sequence
The discharge condition fluctuating range reference value of point is arranged, the discharge condition reference value of next time series point is calculated, and will be next
The discharge condition reference value of time series point passes to discharge condition fluctuating range controller 605.
It should be noted that the processing procedure of said system can be based on VC++ platforms, or embedded system etc., this implementation
Example is not especially limited to this.In addition, the mode that can be run according to multithreading in running, makes to be controlled using modularization programming
Object EDM changes the cutter lifting cycle.Control to discharge condition fluctuating range is realized by the self-adaptative adjustment to the cutter lifting cycle, and
Reach the robustness of electrical discharge machining Self Adaptive Control.
System provided in an embodiment of the present invention, by the way that according to the discharge condition value in upper time sequence of interval, it is right to calculate
The discharge condition fluctuating range answered.Based on the first numerical relationship model, according to discharge condition fluctuating range, sequence area of the upper time
Discharge condition reference value in interior discharge condition fluctuating range reference value and upper time sequence of interval, calculates future time
The discharge condition reference value of sequence of interval.Based on the second numerical relationship model, according to the discharge condition of future time sequence of interval
Reference value, calculates the discharge condition fluctuating range reference value of future time sequence of interval.According to putting for future time sequence of interval
Electricity condition reference value, the discharge condition value of current time sequence of points and predetermined number time series before current time sequence of points
The discharge condition value of point, the control signal of future time sequence of points is calculated according to Self Adaptive Control mode.Based on future time sequence
The control signal of point is arranged, next cutter lifting cycle of electric spark machine tool is obtained.Due to can be to discharge condition reference value and electric discharge
State fluctuation amplitude reference value carries out real-time adjustment such that it is able to by the control of discharge condition fluctuating range in any scope, enter
And the uniformity of finished surface can be improved.
Simultaneously, additionally it is possible to the stability of electric spark adaptive machining is maintained in the working solution of different electrical conductivity.Especially
Under the conditions of forceful electric power conductance working fluid, such as deionization is insufficient, by the control to discharge condition fluctuating range, electrical conductivity compared with
Also electrical spark working can be capable of achieving in working fluid high by the stability maintenance of electrical discharge machining Adaptable System in preferable degree
The robustness of work Self Adaptive Control, and working ability and efficiency can be improved.
Finally, the present processes are only preferably embodiment, are not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc. should be included in protection of the invention
Within the scope of.
Claims (8)
1. a kind of electrical discharge machining self-adaptation control method, it is characterised in that methods described includes：
Based on current time sequence of points, according to the discharge condition value in upper time sequence of interval, corresponding discharge condition is calculated
Fluctuating range；
Based on the first numerical relationship model, according to the electric discharge shape in the discharge condition fluctuating range, upper time sequence of interval
Discharge condition reference value in state fluctuating range reference value and upper time sequence of interval, calculates putting for future time sequence of interval
Electricity condition reference value；
Based on the second numerical relationship model, the discharge condition reference value according to future time sequence of interval calculates future time sequence
Arrange interval discharge condition fluctuating range reference value；
The discharge condition value and current time of discharge condition reference value, current time sequence of points according to future time sequence of interval
The discharge condition value of predetermined number time series point, future time sequence is calculated according to Self Adaptive Control mode before sequence of points
The control signal of point；
Based on the control signal of future time sequence of points, next cutter lifting cycle of electric spark machine tool is obtained.
2. method according to claim 1, it is characterised in that the discharge condition according in upper time sequence of interval
Value, before calculating corresponding discharge condition fluctuating range, also includes：
The discharge condition value in upper time sequence of interval that acquisition is prestored.
3. method according to claim 1, it is characterised in that the discharge condition according in upper time sequence of interval
Value, calculates corresponding discharge condition fluctuating range, including：
The variance yields corresponding to the discharge condition value in upper time sequence of interval is calculated, the variance yields is put as corresponding
Electricity condition fluctuating range.
4. method according to claim 1, it is characterised in that first numerical relationship model is that discharge condition fluctuates width
Degree, the linearly or nonlinearly numerical relationship model between discharge condition fluctuating range reference value and discharge condition reference value；
Second numerical relationship model for linear between discharge condition reference value and discharge condition fluctuating range reference value or
Nonlinear mathematicses relational model.
5. method according to claim 1, it is characterised in that the Self Adaptive Control mode includes the advanced pre- observing and controlling of three steps
Mode processed, advanced two-staged prediction control mode, the minimum variance predictive control mode of jump ahead or minimum variance with refer to mould
The Self Adaptive Control mode of type coupling.
6. method according to claim 1, it is characterised in that the control signal based on future time sequence of points, obtains
Next cutter lifting cycle of power taking spark machine tool, including：
According to the mapping relations between control signal and cutter lifting cycle, the control signal of future time sequence of points is mapped as electric fire
Next cutter lifting cycle of flower machining tool.
7. a kind of electrical discharge machining adaptive controller, it is characterised in that described device includes：Discharge condition fluctuating range control
Molding block, self-adaptive control module and electric spark machine tool；
The discharge condition fluctuating range control module, for calculating discharge condition reference value based on the first numerical relationship model,
Discharge condition fluctuating range reference value is calculated based on the second numerical relationship model；
The self-adaptive control module, for according to the discharge condition reference value, the discharge condition value of current time sequence of points
And before current time sequence of points predetermined number time series point discharge condition value, calculate control signal, according to the control
The signal acquisition processed corresponding cutter lifting cycle；
The electric spark machine tool, for being modified to the upper cutter lifting cycle according to the cutter lifting cycle, realizes electric spark
The Self Adaptive Control of processing.
8. a kind of electrical discharge machining adaptive control system, it is characterised in that the system includes：Discharge condition identification unit,
Parameter identification unit, discharge condition fluctuating range calculator, discharge condition are controlled with reference to value controller, discharge condition fluctuating range
Device, adaptive controller, cutter lifting computation of Period unit and electric spark machine tool；
The discharge condition identification unit, for the discharge condition value of on-line identification sampled point, and by the discharge condition of sampled point
Value passes to parameter identification unit, adaptive controller and discharge condition fluctuating range calculator.
The parameter identification unit, for the discharge condition value according to obtained by identification, distinguishes to EDM model parameter
Know, the model parameter of identification is passed into the adaptive controller；
The discharge condition fluctuating range calculator, for according to the discharge condition value in upper time sequence of interval, it to be right to calculate
The discharge condition fluctuating range answered, and the discharge condition fluctuating range is passed into the discharge condition refer to value controller；
The discharge condition refers to value controller, for according in the discharge condition fluctuating range, upper time sequence of interval
Discharge condition reference value and upper time sequence of interval in discharge condition fluctuating range reference value, calculate future time sequence
Discharge condition reference value in interval, and the discharge condition reference value is passed into the adaptive controller and the electric discharge
State fluctuation amplitude controller；
The discharge condition fluctuating range controller, for according to the discharge condition reference value in future time sequence of interval, meter
The discharge condition fluctuating range reference value in future time sequence of interval is calculated, by the discharge condition ripple in future time sequence of interval
Dynamic amplitude reference value passes to discharge condition and refers to value controller；
The adaptive controller, for according to the discharge condition reference value in future time sequence of interval, current time sequence
The discharge condition value of predetermined number time series point before the discharge condition value and current time sequence of points of point, calculates control letter
Number, and the control signal is passed into the cutter lifting computation of Period unit；
The cutter lifting computation of Period unit, for based on the control signal, obtaining the cutter lifting cycle, and the cutter lifting cycle is passed
Pass the electric spark machine tool；
The electric spark machine tool, for being modified to the upper cutter lifting cycle according to the cutter lifting cycle, realizes electric spark
The Self Adaptive Control of processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611101984.8A CN106808035B (en) | 2016-12-02 | 2016-12-02 | Electrical discharge machining self-adaptation control method, apparatus and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611101984.8A CN106808035B (en) | 2016-12-02 | 2016-12-02 | Electrical discharge machining self-adaptation control method, apparatus and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106808035A true CN106808035A (en) | 2017-06-09 |
| CN106808035B CN106808035B (en) | 2018-10-26 |
Family
ID=59106856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611101984.8A Expired - Fee Related CN106808035B (en) | 2016-12-02 | 2016-12-02 | Electrical discharge machining self-adaptation control method, apparatus and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106808035B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107398612A (en) * | 2017-09-13 | 2017-11-28 | 厦门大学 | A kind of electric spark clearance discharge condition detection apparatus and method based on cluster analysis |
| CN109202192A (en) * | 2018-10-31 | 2019-01-15 | 清华大学 | Fine electric spark servo scanning machined parameters preferred method and system |
| CN110621431A (en) * | 2018-04-17 | 2019-12-27 | 三菱电机株式会社 | Electric discharge machining apparatus and method for controlling lifting operation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0430917A (en) * | 1990-05-24 | 1992-02-03 | Makino Milling Mach Co Ltd | Method and device for adaptive control of wire-cut electric discharge machine |
| EP0469471B1 (en) * | 1990-07-30 | 1995-06-21 | Mitsubishi Denki Kabushiki Kaisha | Adaptive control unit for electrical discharge machine |
| CN1293091A (en) * | 1999-10-18 | 2001-05-02 | 三菱电机株式会社 | Metal wire discharge processing device |
| CN105171146A (en) * | 2015-07-14 | 2015-12-23 | 北京建筑大学 | Self-adaptive control system and method for electric spark machining |
-
2016
- 2016-12-02 CN CN201611101984.8A patent/CN106808035B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0430917A (en) * | 1990-05-24 | 1992-02-03 | Makino Milling Mach Co Ltd | Method and device for adaptive control of wire-cut electric discharge machine |
| EP0469471B1 (en) * | 1990-07-30 | 1995-06-21 | Mitsubishi Denki Kabushiki Kaisha | Adaptive control unit for electrical discharge machine |
| CN1293091A (en) * | 1999-10-18 | 2001-05-02 | 三菱电机株式会社 | Metal wire discharge processing device |
| CN105171146A (en) * | 2015-07-14 | 2015-12-23 | 北京建筑大学 | Self-adaptive control system and method for electric spark machining |
Non-Patent Citations (2)
| Title |
|---|
| 周明等: "电火花加工放电状态的自适应滤波", 《哈尔滨工程大学学报》 * |
| 贾振元等: "基于局域波分解的电火花加工放电状态预测方法", 《机械工程学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107398612A (en) * | 2017-09-13 | 2017-11-28 | 厦门大学 | A kind of electric spark clearance discharge condition detection apparatus and method based on cluster analysis |
| CN110621431A (en) * | 2018-04-17 | 2019-12-27 | 三菱电机株式会社 | Electric discharge machining apparatus and method for controlling lifting operation |
| CN110621431B (en) * | 2018-04-17 | 2020-10-13 | 三菱电机株式会社 | Electric discharge machining apparatus and method for controlling lifting operation |
| CN109202192A (en) * | 2018-10-31 | 2019-01-15 | 清华大学 | Fine electric spark servo scanning machined parameters preferred method and system |
| CN109202192B (en) * | 2018-10-31 | 2019-09-17 | 清华大学 | Fine electric spark servo scanning machined parameters preferred method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106808035B (en) | 2018-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106808035A (en) | Electrical discharge machining self-adaptation control method, apparatus and system | |
| CN103008808B (en) | Numerical control electrolytic machining integrated control system and control method thereof | |
| CN101807798B (en) | Section data integration method for power system safety and stability online analysis | |
| CA2742611A1 (en) | Current limiting power generation control device and method | |
| CN103199562A (en) | Wind power station active power control method | |
| CN103551683B (en) | Electrode gap control method and device for numerical control electrolytic machining | |
| CN104104112B (en) | MPPT control method for the photovoltaic combining inverter of two-stage topologies | |
| CN106513879B (en) | A kind of spark discharge state recognition and detection method based on chaology | |
| CN106125817B (en) | A kind of photovoltaic MPPT methods based on photovoltaic cell four parameter model | |
| CN202283621U (en) | Intelligent energy-saving high-frequency pulse power supply for wire cutting | |
| CN113122879B (en) | Hydrogen production control method and hydrogen production system | |
| CN104378033B (en) | Method for tracing maximum power point of switch reluctance motor wind power generation system | |
| CN105171146A (en) | Self-adaptive control system and method for electric spark machining | |
| CN110417031B (en) | Method for sectionally setting frequency deviation coefficient of automatic power generation control system | |
| CN202271058U (en) | High-frequency encoding oscillating plate | |
| CN104028861A (en) | Electrical discharge machining level-by-level self-adaptive fuzzy control method of metal-ceramic functionally graded material | |
| CN102570470B (en) | Transient stability-based generator phase advancing depth determination method | |
| CN116467986B (en) | Automatic control principle-based alkaline electrolytic tank dynamic model modeling method | |
| CN112003333A (en) | Method for improving photovoltaic primary frequency modulation droop control performance | |
| CN104009690B (en) | Determination method for under-excitation limitation curve of hydro generator | |
| CN106670599B (en) | Stablize the method, apparatus and system of electric spark adaptive machining | |
| CN204517136U (en) | A kind of Laser Power Devices | |
| CN104057179A (en) | Power Supply Device For Electrical Arc Welding And Controlling Method Therefor | |
| CN104377728B (en) | Coordination control method for grid connection non-Internet-surfing distribution type wind generating sets | |
| KR20180034150A (en) | Aluminum Collector With Enhanced High Temperature Stability For Energy Storage And Manufacturing Methods For The Same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181026 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |