CN101670472A - Method and device for controlling wire cutting electrochemical discharge processing and feeding - Google Patents
Method and device for controlling wire cutting electrochemical discharge processing and feeding Download PDFInfo
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- CN101670472A CN101670472A CN200910133900A CN200910133900A CN101670472A CN 101670472 A CN101670472 A CN 101670472A CN 200910133900 A CN200910133900 A CN 200910133900A CN 200910133900 A CN200910133900 A CN 200910133900A CN 101670472 A CN101670472 A CN 101670472A
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Abstract
The invention relates to a method for controlling wire cutting electrochemical discharge processing and feeding, which takes tension variation of a wire electrode in processing as a basis for judgingthe occurrence of a contact processing event. When contact processing occurs, a cutter needs to be back to lead the wire electrode and a workpiece to be separated again and continuous processing is carried out. Whenever the contact processing occurs and cutter back is finished, the invention can automatically slow down, and therefore, the ideal speed in theory can be approached.
Description
Technical field
The invention relates to electrochemical discharge processing, and be particularly to a kind of wire cutting electrochemical discharge processing feed control method and device.
Background technology
Non-conductive hard brittle material is widely used in MEMS (Micro-Electro Mechanical System abbreviates MEMS as) or biochip in recent years because of the excellent properties that it has as heat-resisting, the anti-distortion of height, corrosion resistance.Yet, in non-conductive hard brittle material processing, if come material is processed with traditional processing method, the hard crisp characteristic that is had because of its material itself, often there is material to remove the situation that rate increases suddenly, the problem that can cause machining accuracy difference or material surface embrittlement and be difficult to control the processing situation takes place, and processes feed speed and high-precision processing method is necessary so development is high.
General line cutting discharge processing is not subjected to the influence of character such as the strength of materials, hardness, can carry out pahtfinder hard track cutting processing, as long as being tool electric conductivity, machined material all can utilize line cutting discharge processing (Wire Electrical Discharge Machining, abbreviate WEDM as) reach the purpose of processing, but then can't utilize traditional line cutting discharge to machine, but the combined with electrochemical discharge can address the above problem with wire-electrode cutting and processing method for dielectric hard crisp material.
Known electrochemical discharge processing feeding method comprises feeding of counterweight counterweight and constant speed feeding processing method.
Fig. 1 is the schematic diagram that shows counterweight counterweight feeding method.
" counterweight counterweight feeding method " is that by the collocation of outer working groove 120 with sliding track mechanism 130, the gravity effect that makes interior working groove 140 be subjected to counterweight causes the effect of auto-feed with counterweight 110 outer being hung on the outer working groove 120.Such feeding mode is that the obsessive line electrode that withstands of workpiece is done processing, make between line electrode and workpiece very close to each other, so be called contact processing again.Because line electrode can be got rid of bubble with workpiece and then get rid of the generation of discharge in the place that contacts, the workpiece that feasible processing must will not contact is earlier on every side eliminated the place collapse that just can make contact and is finished a bit of processing, so will cause very out-of-flatness and coarse surface.Therefore, the shortcoming of counterweight counterweight feeding method is that finished surface out-of-flatness and processing feed speed are unhappy.
" constant speed feeding processing method " is to make line electrode or workpiece process with fixing fast move mode, promptly sets a slower processing feed speed and processes.When processing feed speed during greater than initial feed speed, situation about contacting with workpiece will can not take place in line electrode, and the result can obtain a very smooth finished surface.If can set a desirable processing feed speed, then can obtain smooth finished surface and the fastest processing feed speed, but need the long-term supervision of operator in theory.In case the incident that comes in contact just must reduction of speed, otherwise with regard to becoming contact processing and can obtaining very coarse surface and reduce the processing feed speed, may cause broken string at last.Therefore, the shortcoming of constant speed processing method is can not automation processing.
Summary of the invention
The present invention proposes a kind of wire cutting electrochemical discharge processing feed control method and device, in order to the problem that solves feeding control and avoid line electrode and workpiece is done the processing of contact, and then reach automation complicated track cutting processing, promote working (machining) efficiency and precision.
Based on above-mentioned purpose, the embodiment of the invention has disclosed a kind of wire cutting electrochemical discharge processing feed control method.Carry out a process operation, the one first servo feed speed of setting a workpiece equals a default initial velocity.Set a timer and start, touch time of a line electrode to calculate this workpiece.Read an input value, and judge whether this line electrode contacts with this workpiece.If this line electrode contacts with this workpiece, then carry out withdrawing operation and make this line electrode separate a predeterminable range with this workpiece.Make this first servo feed speed equal one second servo feed speed to continue this process operation.If this line electrode does not contact with this workpiece, judge then whether this timer arrives a default time of contact.If no show should be preset time of contact, then make this workpiece continue this process operation with this first servo feed speed.Should preset time of contact if arrive, and then make this first servo feed speed equal the 3rd servo feed speed to continue this process operation.
The embodiment of the invention has more disclosed a kind of wire cutting electrochemical discharge processing feed control method.Carry out a process operation, the one first servo feed speed of setting a workpiece equals a default initial velocity and an initial input value.In an embodiment, the initial input value is the thread tension setting value.Set a timer and start, touch time of a line electrode to calculate this workpiece.Read one first input value, remove the noise of this first input value and produce one second input value, and judge that this second input value is whether greater than one and value of this an initial input value and a boundary value.In an embodiment, first input value and second input value are respectively the first thread tension setting value and the second thread tension setting value.If this second input value should and be worth greater than this initial input value and this boundary value, then carry out withdrawing operation and make this line electrode separate a predeterminable range with this workpiece.Make this first servo feed speed equal one second servo feed speed to continue this process operation.If this second input value is not more than being somebody's turn to do and value of this initial input setting value and this boundary value, judge then whether this timer arrives a default time of contact.If no show should be preset time of contact, then make this workpiece continue this process operation with this first servo feed speed.Should preset time of contact if arrive, and then make one first servo feed speed equal the 3rd servo feed speed to continue this process operation.
The embodiment of the invention has more disclosed a kind of wire cutting electrochemical discharge processing feed control device, comprises a speed control mechanism, a tension control mechanism, a line electrode, a line tension meter, a workpiece and a controller.This line electrode is provided with along this speed control mechanism tension control mechanism.The one first servo feed speed that this controller is set this workpiece equals a default initial velocity, read the input value that this line tension meter is obtained from this line electrode, judge whether this line electrode contacts with this workpiece, if this line electrode contacts with this workpiece, then carrying out withdrawing operation makes this line electrode separate a predeterminable range with this workpiece, make this first servo feed speed equal one second servo feed speed to continue this workpiece of processing, if this line electrode does not contact with this workpiece, judge then whether a timer arrives a default time of contact, if no show should be preset time of contact, then make this workpiece continue this workpiece of processing with this first servo feed speed, and, then make this first servo feed speed equal one the 3rd servo feed speed to continue this workpiece of processing if arrive and to preset time of contact.In an embodiment, input value is a thread tension value.
Description of drawings
Relevant the present invention is for reaching above-mentioned purpose, the technological means that is adopted and other effect, enumerate below that a preferred embodiment and conjunction with figs. describe in detail as after, wherein:
Fig. 1 is the schematic diagram that shows counterweight counterweight feeding method.
Fig. 2 is the structural representation that shows the wire cutting electrochemical discharge processing feed control device of the embodiment of the invention.
Fig. 3 A is the structural representation that shows the wire cutting electrochemical discharge processing feed control device of another embodiment of the present invention, and it utilizes line contact decision circuitry pilot controller.
Fig. 3 B is the structural representation that shows the line contact decision circuitry of the embodiment of the invention.
Fig. 4 is that the speed that shows the embodiment of the invention is quickened and the control method flow chart of steps of slowing down.
Fig. 5 is that the control method of utilizing that shows the embodiment of the invention is forced the into flow chart of steps of the SERVO CONTROL program of optimum speed with acceleration.
Fig. 6 is that the line tension meter that utilizes that shows the embodiment of the invention is carried out the flow chart of steps of quickening with the SERVO CONTROL program of slowing down.
The specific embodiment
For allow purpose of the present invention, feature, and advantage can become apparent, preferred embodiment cited below particularly, and cooperate appended Fig. 2 to Fig. 6 is described in detail.Specification of the present invention provides different embodiment that the technical characterictic of the different embodiments of the present invention is described.Wherein, the configuration of each element among the embodiment is the usefulness for explanation, is not in order to restriction the present invention.And the part of number in the figure repeats among the embodiment, is for the purpose of simplifying the description, is not the relevance that means between the different embodiment.
The embodiment of the invention has disclosed a kind of wire cutting electrochemical discharge processing feed control method and device.
The wire cutting electrochemical discharge processing feed control method and the device of the embodiment of the invention can allow line electrode keep very near machined object, make that can produce complete bubble on the line electrode covers and make interpolar produce insulation, then produce electric discharge phenomena at bubble layer and carry out wire cutting electrochemical discharge processing by high voltage, control in process, to carry out auto-feed, and can promote working (machining) efficiency simultaneously and obtain surface of good rugosity and precision.
Fig. 2 is the structural representation that shows the wire cutting electrochemical discharge processing feed control device of the embodiment of the invention, and this processing unit (plant) comprises a discharge power supply 210, a linear velocity controlling organization 220, a line tension controlling organization 230, a line tension meter 235, an auxiliary electrode 240, a line electric installation 250, a line electrode 260 that is provided with along linear velocity controlling organization 220 and line tension controlling organization 230, a workpiece 270 and a controller 280 that is positioned in the electrolyte and utilizes line electrode 260 to process.Linear velocity controlling organization 220 comprises a fabric wheel 221 and linear velocity control wheel 223.Line tension controlling organization 230 comprises a fabric wheel 231, line tension control wheel 233 and one bobbin 237.The servo feed speed that controller 280 is set this workpiece equals a default initial velocity, and an input value that reads this line tension meter 235 (for example, thread tension value or judgement signal), judging whether this line electrode contacts with this workpiece, and utilize the SERVO CONTROL feed speed and the direction of control method control workpiece 270.Double-head arrow among the figure is represented the SERVO CONTROL direction of feed of this workpiece.
Fig. 3 A is the structural representation that shows the wire cutting electrochemical discharge processing feed control device of another embodiment of the present invention, and this processing unit (plant) comprises a discharge power supply 310, a linear velocity controlling organization 320, a line tension controlling organization 330, a line tension meter 335, an auxiliary electrode 340, a line electric installation 350, a line electrode 360 that is provided with along linear velocity controlling organization 320 and line tension controlling organization 330, a workpiece 370, a controller 380 and the line contact decision circuitry 390 that is positioned in the electrolyte and utilizes line electrode 360 to process.Line contact decision circuitry 390 is to be electrically connected between controller 380 and the line tension meter 335, judges with hardware circuit pilot controller 380 whether this line electrode 360 contacts with this workpiece 370.
Fig. 3 B is the structural representation that shows the line contact decision circuitry of the embodiment of the invention.Shown in Fig. 3 B, line contact decision circuitry 390 can use hardware circuit to realize that it comprises a low pass filter (LowPass Filter) 410 and one comparator 430.The line tension evaluation 450 that line contact decision circuitry 390 will obtain from line tension meter 335, remove high-frequency noise and receive an end of comparator through a low pass filter 410, then produce another comparison signal, judge whether the incident of coming in contact by comparator 430 again according to a thread tension setting value 450 and tension change appearance evaluation 470.Line contact decision circuitry 390 can software or hardware mode is real does, thus on real work, be not the hardware circuit that entity is necessarily arranged, and can be the program code that is stored in the storage element (not shown).As shown in Figure 6, can use the line contact decision circuitry 390 of method replacement Fig. 3 of software.
Fig. 4 is that the speed that shows the embodiment of the invention is quickened and the control method flow chart of steps of slowing down.
At first, set a primary condition, promptly the servo feed speed (V) of a workpiece equals default initial velocity (step S401).Set a timer (Timer) and start it, touch time (step S402) of a line electrode to calculate this workpiece, then read an input value (for example, thread tension value or judgement signal) (step S403), whether contact (step S404) with this workpiece to judge this line electrode.If this line electrode contacts with this workpiece, the servo feed speed of representing this workpiece is too fast, then withdrawing makes this line electrode separate a predeterminable range (step S405) with this workpiece, utilize a control method to produce the second servo feed speed of this workpiece then to replace the current servo feed speed (promptly, V1=V2) (step S406) is progressively to approach this servo feed speed to ideal velocity.Get back to step S402, repeat above-mentioned steps again.The control method that produces the second servo feed speed of this workpiece in the present embodiment can be default decrement value (that is, behind shilling V2=V1-m, making V1=V2 again).This control method also can be look-up table, PID (Proportional-Integral-Derivative, PID) control, adaptation control, the neural control of class or fuzzy control.
If this line electrode does not contact with this workpiece, judge then whether this timer arrives a default time of contact (for example, 60 seconds) (step S407), and promptly default this workpiece contacts the required time of this line electrode.If no show should be preset time of contact, then keep the former servo feed speed of this workpiece, get back to step S403 then and continue to read another input value (for example, thread tension value or judgement signal).Should preset time of contact if arrive, the servo feed speed of representing this workpiece may not reach the upper limit, so (that is, V1=V3) (step S408) gets back to step S402 then to replace the current servo feed speed to utilize the 3rd servo feed speed that this control method produces this workpiece.The control method that produces the 3rd servo feed speed of this workpiece in the present embodiment can be default increment value (that is, behind shilling V3=V1+n, making V1=V3 again).This control method also can be look-up table, PID (Proportional-Integral-Derivative, PID) control, adaptation control, the neural control of class or fuzzy control.
Fig. 5 is that the control method of utilizing that shows the embodiment of the invention is forced the into flow chart of steps of the SERVO CONTROL program of optimum speed with acceleration.
At first, set a primary condition, promptly the servo feed speed (V) of a workpiece equals default initial velocity (step S501).Set a timer and start it, touch time (for example, 60 seconds) (step S502) of a line electrode to calculate this workpiece, (for example then read an input value, thread tension value or judgement signal) (step S503), whether contact (step S504) to judge this line electrode with this workpiece.If this line electrode contacts with this workpiece, then withdrawing makes this line electrode separate a predeterminable range (step S505) with this workpiece.
This line electrode has the servo feed speed that contacts this workpiece of expression too fast with this workpiece, in order to accelerate to approach this servo feed speed to ideal velocity, can utilize a control method to produce the second servo feed speed of this workpiece to replace the current servo feed speed (that is, V1=V2).This control method that produces the second servo feed speed of this workpiece in the present embodiment be (step S506～S511):
The blanking time when writing down each contact incident and taking place and the position (step S506) of this workpiece are to calculate the second servo feed speed.For example, from the blanking time that the contact incident takes place, with computational speed correction multiplying power (can be described as the decay multiplying power again) (step S507), calculate the process velocity that makes new advances again in curve equation of substitution or the form.
For example, the time target of supposing the generation of desire control contact incident is after 60 seconds, and it is as follows then can to get a decay formula:
The blanking time (t) of decay multiplying power (d)=60 second/contact incident ... formula (1).
Utilize this formula,, can produce a decay multiplying power table with 10 seconds units, as shown in table 1:
Table 1: decay multiplying power table
| Blanking time (t) | ??10 | ??20 | ??30 | ??40 | ??50 | ??60 | ＞60 |
| Decay multiplying power (d) | ??6 | ??3 | ??2 | ??1.5 | ??1.2 | ??1 | 1 |
Can obtain another formula according to the decay multiplying power in this decay multiplying power table, that is:
New servo feed speed V2=V1/ decay multiplying power (d) ... formula (2).
Therefore, when the contact interval time is in 10 seconds, V2=V1/6 then, when the contact interval 10～20 the time, V2=V1/3, by that analogy.Whether the correction (V1-V1/d) of judging the servo feed speed of this workpiece is less than or equal to a default minimum correction (m) (step S508).And the correction (V1-V1/d) that make this servo feed speed too little when the decay multiplying power is during less than this default minimum correction (m), then use after the described speed correction formula of step S406 (promptly, make V2=V1-m) (step S509), make V1=V2 (step S511) again.When the correction of this servo feed speed greater than this default minimum correction, then with the result of calculation of formula (2) as new servo feed speed after (that is, making V2=V1/d) (step S510), make V1=V2 (step S511) again.
This decay multiplying power table can be produced as fuzzy (Fuzzy), ratio calculus control methods such as (Proportional Integral Derivative abbreviate PID as) by the rule of thumb or other.
If this line electrode does not contact with this workpiece, judge then whether this timer arrives a default time of contact (step S512), and promptly default this workpiece contacts the required time of this line electrode.If no show should be preset time of contact, then keep the former servo feed speed of this workpiece, get back to step S503 then and continue to read another input value (for example, thread tension value or judgement signal).Should preset time of contact if arrive, the servo feed speed of representing this workpiece may not reach the upper limit, so (that is, V1=V3) (step S513) gets back to step S502 then to replace the current servo feed speed to utilize the 3rd servo feed speed that this control method produces this workpiece.The control method that produces the 3rd servo feed speed of this workpiece in the present embodiment can be default increment value (that is, behind shilling V3=V1+n, making V1=V3 again).This control method also can be look-up table, PID (Proportional-Integral-Derivative, PID) control, adaptation control, the neural control of class or fuzzy control.
Fig. 6 is that the line tension meter that utilizes that shows the embodiment of the invention is carried out the flow chart of steps of quickening with the SERVO CONTROL program of slowing down.
Set primary condition, comprise that given initial line tension force setting value (WTs) and a servo feed speed (V) equal a default initial velocity (step S601).Set a timer and start it, touch time (for example, 60 seconds) (step S602) of a line electrode to calculate this workpiece.(for example then read an input value, thread tension value (WTin) or judgement signal) (step S603), and remove the noise (Noise) of this input value and (for example produce another input value with wave digital lowpass filter, thread tension value (WTreal) or judge signal), WTreal=(WTin+WTreal * 9)/10 (step S604) wherein.The also available statistical method of the noise of above-mentioned thread tension value removes.Note that this formula W Treal=(WTin+WTreal * 9)/10 is an embodiment, it is not in order to restriction the present invention.
Judge to remove behind the noise thread tension value whether greater than this initial line tension force setting value and a boundary value (K) and (step S605), that is judge whether this line electrode contacts with this workpiece.If this line electrode does not contact with this workpiece, judge then whether this timer arrives a default time of contact (for example, 60 seconds) (step S606), and promptly default this workpiece contacts the required time of this line electrode.If no show should be preset time of contact, then keep the former servo feed speed of this workpiece, get back to step S603 then and continue to read another thread tension value.Should preset time of contact if arrive, and represent that the servo feed speed of this workpiece may not reach the upper limit, so utilize a control method to produce the 3rd servo feed speed of this workpiece, (that is, V1=V3) (step S607) gets back to step S602 then.
If this line electrode contacts with this workpiece, the servo feed speed of representing this workpiece is too fast, then withdrawing makes this line electrode separate a predeterminable range (step S608) with this workpiece, utilize this control method to produce the second servo feed speed (being V1=V2) (step S609) of this workpiece then, progressively to approach this servo feed speed to ideal velocity, get back to step S602 then, repeat above-mentioned steps again.
Note that present embodiment utilizes a control method to produce this second servo feed speed and the 3rd servo feed speed.This control method can be a simple default increment value, default decrement value, look-up table, PID (PID) control, adapts to control, the neural control of class or fuzzy control.
Note that the present invention uses the noise of removing this thread tension value with the real low pass filter of doing of hardware, or do the noise of removing this thread tension value with the real digital filter of doing of software.
Note that the present invention uses an external hardware circuit that this thread tension value is carried out filtering and handles and to utilize a comparator to produce this judgement signal again.
The finished surface that destroys this workpiece if do not desire to cause the contact incident always, then can be with the end value after slowing down as optimum speed, and no longer quicken to handle, perhaps reset this timer with carry out a speedup processing after the time again through a segment length, so can take into account process velocity and processing quality.
The wire cutting electrochemical discharge processing feed control method of the embodiment of the invention finds best process velocity automatically with device, and avoids contact processing to make the surface roughness variation and can realize automatic processing.The tension variation of utilizing the line electrode work in-process is as the foundation of judging that contact processing incident takes place.Add man-hour when coming in contact, then want withdrawing and continue again to process so that line electrode separates again with workpiece.After coming in contact processing and finishing withdrawing, deceleration can be done automatically, so theoretic ideal velocity can be approached.If begin processing and surpass a time interval not come in contact processing with initial velocity, then increase by a fixed speed every a time interval, can stop to quicken up to the incident of coming in contact, and according to the processing of slowing down of aforementioned program, so can find out best process velocity automatically, and take into account the surface roughness of processing work.
The present invention more provides a kind of recording medium (for example CD sheet, disk sheet and removable hard drive or the like), and it is the authority sign-off program of record one embodied on computer readable, so that carry out above-mentioned wire cutting electrochemical discharge processing feed control method.At this, be stored in the authority sign-off program on the recording medium, basically (for example the setting up organization chart code segment, sign-off list code segment, setting program code snippet and deployment program code snippet) formed by a plurality of code segment, and the function of these code segment is to correspond to the step of said method and the functional block diagram of said system.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this operator, without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is when looking being as the criterion that the claim scope defined.
Claims (25)
1. a wire cutting electrochemical discharge processing feed control method comprises the following steps:
Carry out a process operation, the one first servo feed speed of setting a workpiece equals a default initial velocity;
Set a timer and start it, touch time of a line electrode to calculate this workpiece;
Read an input value;
Judge whether this line electrode contacts with this workpiece;
If this line electrode contacts with this workpiece, then carry out withdrawing operation and make this line electrode separate a predeterminable range with this workpiece;
Make this first servo feed speed equal one second servo feed speed to continue this process operation;
If this line electrode does not contact with this workpiece, judge then whether this timer arrives a default time of contact;
If no show should be preset time of contact, then make this workpiece continue this process operation with this first servo feed speed; And
Should preset time of contact if arrive, and then make this first servo feed speed equal one the 3rd servo feed speed to continue this process operation.
2. wire cutting electrochemical discharge processing feed control method as claimed in claim 1 wherein, utilizes a control method to produce this second servo feed speed and the 3rd servo feed speed.
3. wire cutting electrochemical discharge processing feed control method as claimed in claim 2, wherein, this control method is a default increment value, default decrement value, look-up table, PID control, adapts to control, the neural control of class or fuzzy control.
4. wire cutting electrochemical discharge processing feed control method as claimed in claim 2, wherein, this control method that produces this second servo feed speed comprises the following steps:
The blanking time when writing down each contact incident and taking place and the position of this workpiece;
According to the blanking time of this contact incident generation, to calculate a decay multiplying power;
During less than a default minimum correction, then make this second servo feed speed equal this first servo feed speed and deduct this default minimum correction divided by the value of this decay multiplying power when this first servo feed speed deducts this first servo feed speed;
When this first servo feed speed deducts this first servo feed speed and is not less than a default minimum correction divided by the value of this decay multiplying power, then make this second servo feed speed equal this first servo feed speed divided by this multiplying power that decays.
5. wire cutting electrochemical discharge processing feed control method as claimed in claim 1, wherein, this input value is that a thread tension value or is judged signal.
6. wire cutting electrochemical discharge processing feed control method as claimed in claim 5 wherein, can use the noise of removing this thread tension value with the real low pass filter of doing of hardware, or do the noise of removing this thread tension value with the real digital filter of doing of software.
7. wire cutting electrochemical discharge processing feed control method as claimed in claim 5 wherein, uses an external hardware circuit that this thread tension value is carried out the filtering processing and utilizes a comparator to produce this judgement signal again.
8. a wire cutting electrochemical discharge processing feed control method comprises the following steps:
Carry out a process operation, the one first servo feed speed of setting a workpiece equals a default initial velocity and an initial input value;
Set a timer and start it, touch time of a line electrode to calculate this workpiece;
Read one first input value;
Remove the noise of this first input value and produce one second input value;
Judge that this second input value is whether greater than one and value of this an initial input value and a boundary value;
If this second input value should and be worth greater than this initial input value and this boundary value, then carry out withdrawing operation and make this line electrode separate a predeterminable range with this workpiece;
Make this first servo feed speed equal one second servo feed speed to continue this process operation;
If this second input value is not more than being somebody's turn to do and value of this initial input value and this boundary value, judge then whether this timer arrives a default time of contact;
If no show should be preset time of contact, then make this workpiece continue this process operation with this first servo feed speed; And
Should preset time of contact if arrive, and then make this first servo feed speed equal one the 3rd servo feed speed to continue this process operation.
9. wire cutting electrochemical as claimed in claim 8 discharge processing feed control method wherein, utilizes a wave digital lowpass filter to remove the noise of this first input value and produces this second input value.
10. wire cutting electrochemical discharge processing feed control method as claimed in claim 8 wherein, utilizes a statistics method to remove the noise of this first input value and produce this second input value.
11. a wire cutting electrochemical discharge processing feed control device comprises:
One linear velocity controlling organization;
One line tension controlling organization;
One line electrode, it is provided with along this linear velocity controlling organization and this line tension controlling organization;
One line tension meter, it is arranged between this linear velocity controlling organization and this tension control mechanism, obtains an input value in order to this line electrode certainly; And
One workpiece;
One controller, its one first servo feed speed of setting this workpiece equals a default initial velocity, and read this input value, to judge whether this line electrode contacts with this workpiece, if this line electrode contacts with this workpiece, then carrying out withdrawing operation makes this line electrode separate a predeterminable range with this workpiece, make this first servo feed speed equal one second servo feed speed to continue this workpiece of processing, if this line electrode does not contact with this workpiece, judge then whether a timer arrives a default time of contact, if no show should be preset time of contact, then make this workpiece continue this workpiece of processing with this first servo feed speed, and, then make this first servo feed speed equal the 3rd servo feed speed to continue this workpiece of processing if arrive and to preset time of contact.
12. wire cutting electrochemical discharge processing feed control device as claimed in claim 11, wherein, this controller utilizes a control method to produce this second servo feed speed and the 3rd servo feed speed.
13. wire cutting electrochemical discharge processing feed control device as claimed in claim 12, wherein, this control method is for presetting increment value, default decrement value, look-up table, PID control, adapting to control, the control of class nerve or fuzzy control.
14. wire cutting electrochemical discharge processing feed control device as claimed in claim 12, wherein, this control method that produces this second servo feed speed comprises the following steps:
The blanking time when writing down each contact incident and taking place and the position of this workpiece;
According to the blanking time of this contact incident generation, to calculate a decay multiplying power;
During less than a default minimum correction, then make this second servo feed speed equal this first servo feed speed and deduct this default minimum correction divided by the value of this decay multiplying power when this first servo feed speed deducts this first servo feed speed;
When this first servo feed speed deducts this first servo feed speed and is not less than a default minimum correction divided by the value of this decay multiplying power, then make this second servo feed speed equal this first servo feed speed divided by this multiplying power that decays.
15. wire cutting electrochemical discharge processing feed control device as claimed in claim 11, wherein, this input value is that a thread tension value or is judged signal.
16. wire cutting electrochemical discharge processing feed control device as claimed in claim 15, wherein, can use the noise of removing this thread tension value with the real low pass filter of doing of hardware, or do the noise of removing this thread tension value with the real digital filter of doing of software.
17. wire cutting electrochemical discharge processing feed control device as claimed in claim 15 wherein, uses an external hardware circuit that this thread tension value is carried out the filtering processing and utilizes a comparator to produce this judgement signal again.
18. wire cutting electrochemical discharge processing feed control device as claimed in claim 14, it comprises that also being electrically connected at this controller contacts decision circuitry with a line between this line tension meter, and wherein auxiliary this controller of this line contact decision circuitry judges whether this line electrode contacts with this workpiece.
19. computer recordable media, in order to store a computer program, aforementioned calculation machine program comprises a plurality of code segment, and it comprises in order to be loaded in the computer system and to make aforementioned calculation machine system carry out a kind of wire cutting electrochemical discharge processing feed control method:
Carry out a process operation, the one first servo feed speed of setting a workpiece equals a default initial velocity;
Set a timer and start it, touch time of a line electrode to calculate this workpiece;
Read an input value;
Judge whether this line electrode contacts with this workpiece;
If this line electrode contacts with this workpiece, then carry out withdrawing operation and make this line electrode separate a predeterminable range with this workpiece;
Make this first servo feed speed equal one second servo feed speed to continue this process operation;
If this line electrode does not contact with this workpiece, judge then whether this timer arrives a default time of contact;
If no show should be preset time of contact, then make this workpiece continue this process operation with this first servo feed speed; And
Should preset time of contact if arrive, and then make this first servo feed speed equal one the 3rd servo feed speed to continue this process operation.
20. computer recordable media as claimed in claim 19 wherein, utilizes a control method to produce this second servo feed speed and the 3rd servo feed speed.
21. computer recordable media as claimed in claim 20, wherein, this control method is default increment value, default decrement value, look-up table, PID control, adaptation control, the neural control of class or fuzzy control.
22. computer recordable media as claimed in claim 20, wherein, this control method that produces this second servo feed speed comprises the following steps:
The blanking time when writing down each contact incident and taking place and the position of this workpiece;
According to the blanking time of this contact incident generation, to calculate a decay multiplying power;
During less than a default minimum correction, then make this second servo feed speed equal this first servo feed speed and deduct this default minimum correction divided by the value of this decay multiplying power when this first servo feed speed deducts this first servo feed speed;
When this first servo feed speed deducts this first servo feed speed and is not less than a default minimum correction divided by the value of this decay multiplying power, then make this second servo feed speed equal this first servo feed speed divided by this multiplying power that decays.
23. computer recordable media as claimed in claim 19, wherein, this input value is that a thread tension value or is judged signal.
24. computer recordable media as claimed in claim 23 wherein, can use the noise of removing this thread tension value with the real low pass filter of doing of hardware, or do the noise of removing this thread tension value with the real digital filter of doing of software.
25. computer recordable media as claimed in claim 23 wherein, uses an external hardware circuit that this thread tension value is carried out the filtering processing and utilizes a comparator to produce this judgement signal again.
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