CN104646774B - A kind of export license real-time compensation method based on spark discharge rate - Google Patents
A kind of export license real-time compensation method based on spark discharge rate Download PDFInfo
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- CN104646774B CN104646774B CN201410777505.9A CN201410777505A CN104646774B CN 104646774 B CN104646774 B CN 104646774B CN 201410777505 A CN201410777505 A CN 201410777505A CN 104646774 B CN104646774 B CN 104646774B
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- 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
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- 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
- B23H1/04—Electrodes specially adapted therefor or their manufacture
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
- G16Z99/00—Subject matter not provided for in other main groups of this subclass
Abstract
A kind of export license real-time compensation method based on spark discharge rate, relating to a kind of method of export license real-Time Compensation in electrical discharge milling machining, in order to solve, compensation for electrode wear in existing current electrical discharge milling machining is inaccurate causes meeting requirement on machining accuracy and servo feed instability causes the problem that working (machining) efficiency is low.The method comprises the steps, step one: Real-time Collection voltage across poles value, and judges whether interpolar discharges according to voltage across poles value, when interpolar occurs electric discharge, the discharge rate in electric spark milling discharge process carries out statistics and obtains w (te): step 2: calculate real-time electrode wear rate η (t with the relation formula of electrode wear rate according to discharge ratee), step 3: electrode movement control system calculates the electrode obtained proportion of goods damageds η (t according to step 2e) regulation compensation for electrode wear amount, thus reach the purpose that compensation for electrode wear is adjusted in real time according to interpolar discharge rate.It is mainly used in electric spark machining field.
Description
Technical field
The present invention relates to a kind of method of export license real-Time Compensation in electrical discharge milling machining.
Background technology
Aerospace industries employs substantial amounts of high intensity, exotic material such as titanium alloy, Ni-based high-temperature alloy etc., uses
It is the highest that traditional processing method carries out cost of charp tool when large volume material is removed to difficult-to-machine material.Electrical discharge milling machining utilizes
Digital control system controls simple tubulose electrode movement, and is equipped with high pressure and rushes liquid, it is achieved that be similar to the electric spark of tradition Milling Process
Layered milling is processed, and its current working (machining) efficiency has also had arrived at the level close with machinery milling, therefore in space flight and aviation
There is the biggest application space in field.The hot compound action relying on interpolar discharge to produce due to electric spark milling removes material, work
The while that part material being removed, electrode has also been depleted a part, and therefore in the course of processing, electrode length in the axial direction gradually becomes
Short, affect machining accuracy.The precision of compensation for electrode wear directly decides machining accuracy, and therefore compensation for electrode wear problem is
One of key technology realizing electrical discharge milling machining.
It is right that current compensation for electrode wear method mainly has off-line predictive compensation method, on-line checking penalty method and online interval to pinpoint
Cutter penalty method.Export license is mainly predicted by off-line predictive compensation method according to experiment experience or mathematical operation, but right
It is bigger that unknown machined parameters is predicted time error.On-line checking penalty method mainly uses probe or CCD image to become
The method that the method detecting electrode length such as picture compensate, it is the most loaded down with trivial details and need detection equipment that it realizes process.Between Xian
Fixed-point tool setting penalty method of having a rest is by adding breaking working in man-hour and controlling electrode to fixing point use electric spark contact perceptive function
Detecting electrode length changes, thus by the compensation for electrode wear of measurement to ensuing processor, this compensation method needs
Spend the more time, reduce working (machining) efficiency, and be that the export license amount of the preceding paragraph program is compensated next section of journey
In sequence, precision is not the highest.
The Chinese invention patent application of Publication No. 101982280A is to calculate export license amount according to discharge energy, and it is adopted
Although referred to as real-Time Compensation, but actually by disposable for the waste that calculates according to discharge energy in certain time
Compensating in the processing of next section, this real-time compensation is not real real-Time Compensation, and export license amount and electrode wear rate
There is the difference of essence.
Therefore, research and develop a kind of simple, reliable, practical compensation for electrode wear method to become electric spark milling is applied to difficulty
The key of rapidoprint manufacture field.
Summary of the invention
The present invention be in order to solve compensation for electrode wear in existing current electrical discharge milling machining inaccurate cause meeting add
Work required precision and servo feed instability cause the problem that working (machining) efficiency is low, the invention provides a kind of based on spark discharge rate
Export license real-time compensation method.
A kind of export license real-time compensation method based on spark discharge rate, it is characterised in that the method comprises the steps:
Step one: Real-time Collection voltage across poles value, and judge whether interpolar discharges according to voltage across poles value, when interpolar is sent out
During raw electric discharge, the spark discharge rate in electric spark milling discharge process is carried out statistics and obtains:
teFor the discharge time in the single pulse time；T is the sampling time；w(te) it is spark discharge rate；
Step 2: calculate real-time electrode wear rate η (t with the relation formula of electrode wear rate according to spark discharge ratee), described
The relation formula according to spark discharge rate with electrode wear rate be:
η(te)=f (te)*w(te),
f(te) it is the relationship between spark discharge rate and electrode wear rate；η(te) it is electrode wear rate,
Step 3: electrode movement control system calculates the electrode obtained proportion of goods damageds η (t according to step 2e) regulation compensation for electrode wear
Amount, thus reach the purpose that compensation for electrode wear is adjusted in real time according to interpolar discharge rate.
The method that the application is proposed and existing energy compensating export license method have a difference of essence:
(1) detection method being based on is different: existing energy compensating export license method is by detection discharge power or electricity
Stream signal calculates discharge energy；And the application is to calculate spark discharge rate by the detection real-time discharge voltage of interpolar；
(2) computational methods compensated are different: existing energy compensating export license method is to calculate electrode according to discharge energy to damage
Consumption；And the application calculates according to spark discharge rate is electrode wear rate, electrode wear rate and export license amount have essence
Difference.
(3) mode compensated is different: although existing energy compensating export license method referred to as real-Time Compensation, but actually
It is in waste disposable compensation to next section processing that will calculate according to discharge energy in certain time；And the application is root
Calculate the electrode obtained proportion of goods damageds according to spark discharge rate, export license is evenly distributed in processed distance, simply by the presence of fire
Flower discharges and will there is real-time compensation for electrode wear, and the simply electrode wear rate that the application adjusts according to spark discharge rate
Numerical value.
The principle of the present invention is:
During electrical discharge milling machining, in real time interpolar discharge voltage waveform is detected, and record real-time interpolar electricity
Pressure numerical value,
When voltage across poles is more than certain numerical value, interpolar does not discharge, and interpolar is in Light Condition,
When voltage across poles is less than short circuit reference voltage, interpolar is short-circuited,
Only when voltage across poles value is between zero load and short circuit reference voltage level, interpolar is discharging.
The method that the present invention proposes only just carries out the real-Time Compensation of export license when spark discharge；Electricity is not carried out time unloaded
The compensation of pole loss；During short circuit, processing is interrupted, and electrode carries out a cutter lifting action, electrode now being perpendicular to direction of feed
The proportion of goods damageds are calculated by the maximum of spark discharge rate.
When electric spark regular picture, calculate the spark discharge rate in the sampling period according to the voltage across poles of detection in real time,
And real-time spark discharge rate is converted to the electrode wear rate of correspondence by the formula drawn by early stage, and then adjust electrode in real time
Loss balancing amount, it is achieved accurate loss balancing.
Based on principles above, based on spark discharge rate the real-time compensation for electrode wear method that the present invention proposes, it is achieved that only
Just compensate during electric spark milling electric discharge, and achieve the function that compensation dosage is adjusted in real time according to spark discharge rate,
It is greatly improved the precision of compensation for electrode wear, overcomes servo feed instability and cause the problem that working (machining) efficiency is low.
Accompanying drawing explanation
Fig. 1 is the principle schematic of a kind of export license real-time compensation method based on spark discharge rate of the present invention；
Fig. 2 is the relation schematic diagram of spark discharge rate and electrode wear rate；Wherein, A represents low bloom, and B represents high fire
Flower district, reference 1 represents that at unloaded, C represents shorting region；
Fig. 3 is the interpolar regular picture voltage waveform view gathered；Wherein U represents voltage across poles value.
Detailed description of the invention
Detailed description of the invention one: seeing Fig. 1 and present embodiment is described, the one described in present embodiment is based on spark discharge rate
Export license real-time compensation method, the method comprises the steps:
Step one: Real-time Collection voltage across poles value, and judge whether interpolar discharges according to voltage across poles value, when interpolar is sent out
During raw electric discharge, the spark discharge rate in electric spark milling discharge process is carried out statistics and obtains:
teFor the discharge time in the single pulse time；T is the sampling time；w(te) it is spark discharge rate；
Step 2: calculate real-time electrode wear rate η (t with the relation formula of electrode wear rate according to spark discharge ratee), described
The relation formula according to spark discharge rate with electrode wear rate be:
η(te)=f (te)*w(te),
f(te) it is the relationship between spark discharge rate and electrode wear rate；η(te) it is electrode wear rate,
Step 3: electrode movement control system calculates the electrode obtained proportion of goods damageds η (t according to step 2e) regulation compensation for electrode wear
Amount, thus reach the purpose that compensation for electrode wear is adjusted in real time according to spark discharge rate.
In present embodiment,
Embodiment: when using the electrical discharge milling machining high-temperature alloy turbine disk, owing to the turbine disk needs the curved surface ratio of processing
More complicated, there is many electrode skies and walk stroke, it is possible to demonstrate export license real-time compensation method based on spark discharge rate
Superiority.Electrode when turbine disk surface of the work carries out feed according to processor prepared in advance,
When electrode does not the most discharge with workpiece is distant, there is not export license, the spark discharge rate of detection gained
It is zero, as shown in Fig. 2 zero load, loss balancing therefore during electrode movement, will not be carried out；
When electrode just comes into contact with workpiece, now discharging is not continuous print, and the spark discharge rate of detection gained is relatively low,
Discharge rate is positioned at the low spark discharge rate district shown in Fig. 2, and now corresponding electrode wear rate is relatively low, therefore digital control system meeting
In real time compensation for electrode wear amount is adjusted in relatively low level；
When electrode and workpiece completely attach to, now electric discharge starts gradually continuous, its discharge voltage waveform meeting as it is shown on figure 3,
Overwhelming majority pulse is all being discharged, and spark discharge rate is maintained at high spark discharge rate region, therefore numerical control system shown in Fig. 2
Compensation for electrode wear amount can be adjusted in higher level in real time by system according to result of calculation；
Occasionality, owing to the reasons such as interpolar topping up is insufficient can cause the short circuit of interpolar, now electrode can stop performing at once
Processor also lifts certain height being perpendicular to the electrode direction of feed direction to workpiece dorsad, thus quickly terminates short
Road situation, motion the most at a slow speed returns the point of interruption, proceeds processing, and the compensation for electrode wear amount in short circuit moment is with reference to
Electrode wear rate during high spark discharge rate.
Therefore, export license real-time compensation method based on spark discharge rate, also it is achieved that electricity based on real-time discharge scenario
Pole loss balancing, electrode wear rate adjusts in real time according to spark discharge rate, and then regulates electrode in real time by digital control system
Loss balancing amount, so substantially increases the precision of electric spark milling compensation for electrode wear.
Detailed description of the invention two: see Fig. 1 and present embodiment, present embodiment and described in detailed description of the invention one are described
The difference planting export license real-time compensation method based on spark discharge rate is, described judges interpolar according to voltage across poles value
The condition whether generation is discharged is: voltage across poles value is between zero load and short circuit reference voltage level.
Present embodiment, carries out the real-time adjustment of electrode wear rate according to spark discharge rate in electrical discharge milling machining, electrode damages
Consumption compensation dosage changes along with the change of spark discharge rate.
Detailed description of the invention three: present embodiment is damaged with a kind of based on spark discharge rate the electrode described in detailed description of the invention one
The difference of consumption real-time compensation method is, according to the Time Calculation discharge time after discharge breakdown in processing, and with in processing
Spark discharge rate w (t is calculated on the basis of time after discharge breakdowne)。
Detailed description of the invention four: present embodiment and a kind of based on spark discharge rate the export license described in detailed description of the invention one
The difference of real-time compensation method is, determines that spark discharge rate is public with the relation of electrode wear rate by the method for data analysis
Formula.
Claims (4)
1. an export license real-time compensation method based on spark discharge rate, it is characterised in that the method comprises the steps:
Step one: Real-time Collection voltage across poles value, and judge whether interpolar discharges according to voltage across poles value, when interpolar is sent out
During raw electric discharge, the spark discharge rate in electric spark milling discharge process is carried out statistics and obtains:
teFor the discharge time in the single pulse time；T is the sampling time；w(te) it is spark discharge rate；
Step 2: calculate real-time electrode wear rate η (t with the relation formula of electrode wear rate according to spark discharge ratee), described
The relation formula according to spark discharge rate with electrode wear rate be:
η(te)=f (te)*w(te),
f(te) it is the relationship between spark discharge rate and electrode wear rate；η(te) it is electrode wear rate,
Step 3: electrode movement control system calculates the electrode obtained proportion of goods damageds η (t according to step 2e) regulation compensation for electrode wear
Amount, thus reach the purpose that compensation for electrode wear is adjusted in real time according to spark discharge rate.
A kind of export license real-time compensation method based on spark discharge rate the most according to claim 1, it is characterised in that
Described judge whether interpolar occurs the condition of electric discharge to be according to voltage across poles value: voltage across poles value is in unloaded and short circuit reference
Between magnitude of voltage.
A kind of export license real-time compensation method based on spark discharge rate the most according to claim 1, it is characterised in that
According to Time Calculation discharge time after discharge breakdown in processing, and count on the basis of time after discharge breakdown in processing
Calculate spark discharge rate w (te)。
A kind of export license real-time compensation method based on spark discharge rate the most according to claim 1, it is characterised in that
The relation formula of spark discharge rate and electrode wear rate is determined by the method for data analysis.
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| CN104646774B true CN104646774B (en) | 2016-11-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105127529B (en) * | 2015-09-06 | 2017-08-11 | 清华大学 | Discharge the micro EDM swivel feeding mainshaft head mechanism being ground suitable for line |
| CN105397218A (en) * | 2015-12-08 | 2016-03-16 | 四川成发航空科技股份有限公司 | Electric spark processing method for sealing grooves of aero engine guide vane |
| CN105397216A (en) * | 2015-12-08 | 2016-03-16 | 四川成发航空科技股份有限公司 | Combined processing-type electrode used for machining sealing grooves of aero-engine guide blades |
| CN106077853B (en) * | 2016-07-14 | 2017-12-29 | 大连大学 | A kind of micro- 3 d part electric spark milling process method |
| CN106238837B (en) * | 2016-09-05 | 2018-01-05 | 常州大学 | The spark discharge processing method and its equipment of free electrode |
| CN109202192B (en) * | 2018-10-31 | 2019-09-17 | 清华大学 | Fine electric spark servo scanning machined parameters preferred method and system |
| CN110508886B (en) * | 2019-08-26 | 2020-09-04 | 哈尔滨工业大学 | Efficient discharge milling method utilizing tube electrode shoulder discharge and electrode loss compensation method |
| CN114571019B (en) * | 2022-03-16 | 2023-10-13 | 上海空间推进研究所 | Electric spark milling method |
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| CN1133217A (en) * | 1994-12-07 | 1996-10-16 | 三菱电机株式会社 | Electric spark machining machine-tool |
| US5756954A (en) * | 1994-07-27 | 1998-05-26 | Fanuc Ltd. | Wire electric discharge machining method at a corner |
| CN1526503A (en) * | 2003-02-24 | 2004-09-08 | 三丰株式会社 | Electric spark processing electrode |
| CN101829822A (en) * | 2010-01-28 | 2010-09-15 | 哈尔滨工业大学 | Method for reducing electrode loss of micro electron discharge machining tool by connecting diode with interelectrode in series |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02190219A (en) * | 1989-01-20 | 1990-07-26 | Mitsubishi Electric Corp | Electric discharge machine |
| JP2717474B2 (en) * | 1992-01-24 | 1998-02-18 | 三菱電機株式会社 | EDM method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5756954A (en) * | 1994-07-27 | 1998-05-26 | Fanuc Ltd. | Wire electric discharge machining method at a corner |
| CN1133217A (en) * | 1994-12-07 | 1996-10-16 | 三菱电机株式会社 | Electric spark machining machine-tool |
| CN1526503A (en) * | 2003-02-24 | 2004-09-08 | 三丰株式会社 | Electric spark processing electrode |
| CN101829822A (en) * | 2010-01-28 | 2010-09-15 | 哈尔滨工业大学 | Method for reducing electrode loss of micro electron discharge machining tool by connecting diode with interelectrode in series |
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