CN100386170C - Temperature detector for electric spark wire cutting processing electrode wire - Google Patents

Temperature detector for electric spark wire cutting processing electrode wire Download PDF

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Publication number
CN100386170C
CN100386170C CNB2006100121637A CN200610012163A CN100386170C CN 100386170 C CN100386170 C CN 100386170C CN B2006100121637 A CNB2006100121637 A CN B2006100121637A CN 200610012163 A CN200610012163 A CN 200610012163A CN 100386170 C CN100386170 C CN 100386170C
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resistance
wire
probe
constant
operational amplifier
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CN1858568A (en
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韩福柱
程刚
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Tsinghua University
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Tsinghua University
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Abstract

The present invention relates to a temperature detector for cutting and processing electrode wires with electric spark wires, which belongs to the technical field of a heat processing temperature detector. The present invention is composed of a four-wire detector, a constant-current source, an oscilloscope, a differential amplifier, wherein the constant current source is connected with a power supply brush of a processing machine through a first probe and a second probe of the four-wire probe; the input end of the differential amplifier is connected with the power supply brush through a third probe and a fourth probe of the four-wire probe; the output end of the differential amplifier is connected with an input port 1 of the oscilloscope; sampling trigger signals provided by the processing machine are accessed into an input port 2 of the oscilloscope. When the material of the electrode wire is copper, the electrode wire positioned in a processing seam is equivalent to a section of thermal resistor. The present invention indirectly obtains the average change quantity of the temperature of the electrode wire by measuring the subtle change of the resistance value of electrode wire. The present invention has the advantages that the resistance of the electrode wire is measured at the moment when electric discharge is finished, and the disturbing influence caused by the electric discharge is avoided; the present invention provides a device for the temperature measurement for cutting and processing an electrode wire with an electric spark wire.

Description

A kind of temperature detector for electric spark wire cutting processing electrode wire
Technical field
The present invention relates to a kind of temperature detector for electric spark wire cutting processing electrode wire, belong to hot processing temperature checkout gear technical field.
Background technology
The thread feed electric spark line cutting technology of being careful is the important a member in special process field, the heat energy fusing workpiece material that it produces when utilizing pulsed discharge between the two poles of the earth (wire electrode and piece pole), thereby reaching the purpose of cutting and removal material, is a kind of typical hot-working technology.The factor that present restriction line cutting technology further develops mainly contains two, and one is the bending and the vibration of wire electrode, and another is a fracture of wire.They are all closely related with the temperature of wire electrode, and for the former, when the wire electrode temperature raise, the bending of wire electrode and Oscillation Amplitude will increase, thereby caused the deterioration of crudy and machining accuracy; And for the latter, the rising of wire electrode temperature will inevitably reduce its mechanical strength, is easy to produce fracture of wire under the effect of external force (as wire electrode tension, discharge impact power etc.), thereby reduces working (machining) efficiency.As seen the wire electrode temperature is the important technology parameter of thread feed electric spark line cutting processing of being careful, if can accurately measure the temperature of wire electrode in the pulsed discharge process, just can be optimized and control, under the prerequisite that guarantees crudy and precision, further improve working (machining) efficiency machined parameters.
Accurate measurement to the wire electrode temperature is people's targets of unremitting pursue for a long time, mainly is divided into following three classes:
(1) contact type measurement
The probe of thermal resistance sensor or thermocouple sensor touched or near wire electrode to reach the purpose of temperature signal collection.The shortcoming of this method is conspicuous.This be because, at first, the diameter of wire electrode is very little, the diameter of micro-electrode silk even only be 0.02mm, when wire electrode incision workpiece was inner, the probe of sensor was difficult to pass processing and stitches and effectively contact with wire electrode; Secondly, even probe has contacted with wire electrode, according to theory analysis as can be known, the Temperature Distribution of wire electrode is extremely inhomogeneous in the discharge process, the temperature at discharge channel center can reach thousands of degrees centigrade, and the temperature beyond the discharge channel is very low, can not guarantee during measurement that the probe contact point just in time is positioned at the discharge channel center, so local surfaces temperature that contact measurement method can only the measurement electrode silk, and can not accurately catch the temperature of point of discharge, can't satisfy the thermometric requirement of wire electrode.
(2) non-contact measurement
Contactless measurement is determined the temperature of object by heat radiation, and common concrete grammar mainly contains: total radiation ther, monochromatic brightness thermometry, infrared measurement of temperature method, optical fiber thermometry and thermal imaging system thermometry etc.Contactless temperature-measuring method does not disturb the temperature field of testee in measuring process, and has the advantages that the response time is short, temperature-measuring range is wide.But its shortcoming still is difficult to overcome for the wire electrode temp measuring system, mainly shows: can not measurement electrode silk temperature inside; Be subjected to the influence of emissivity bigger, must carry out the emissivity correction and just can obtain true temperature; Equipment is complicated, and price is higher; The most important thing is that the residing surrounding medium of wire electrode (being immersed in the working fluid and the incision workpiece) is very big to thermometric precision influence.
(3) indirect temperature measurement method
Being applied to wire electrode at present thermometric mainly is indirect measurement method, and according to literature search, known have following two kinds of methods:
1. wire electrode tension---temperature detection method
Jennes etc. have introduced a kind of wire electrode indirect measure, and this method is utilized the corresponding relation of metal material mechanical strength and temperature, try to achieve the wire electrode mean temperature indirectly by the limit tension of measurement electrode silk.This method has significant limitation, mainly shows, for the mean temperature of measurement electrode silk, must apply limit tension to wire electrode under this temperature, thereby cause fracture of wire.The limit tension of wire electrode is not only relevant with the mean temperature of wire electrode, also closely related with the local corrode of wire electrode simultaneously, thereby under the regular picture state, only is not enough to judge the temperature of wire electrode according to limit tension.
2. discharge position---temperature detection method
Haruki etc. have proposed a kind of by detecting the method that discharge position obtains the wire electrode mean temperature indirectly.This method detects the electric current I of putting following two discharge loops simultaneously uAnd I d, and detect the voltage Δ V of wire electrode between the guider up and down simultaneously, the resistance value that then can obtain wire electrode between point of discharge and the following test point is:
r d＝ΔV/(I u+I d)+R 0(I u/I d)(1)
R in following formula 0=r u+ r d, be the total resistance value of wire electrode between two test points, it does not change this method supposition with temperature.In process, discharge might occur in the optional position that is arranged in the wire electrode between the workpiece upper and lower surface, by detecting and calculate the r at each point of discharge place d, just can obtain the distribution situation of wire electrode resistance along the wire electrode length direction.And according to the thermal resistance principle, when the wire electrode temperature changes, r dWith the temperature of wire electrode definite relation is arranged, therefore can obtain the distribution situation of wire electrode temperature along the wire electrode length direction.
This method has certain defective on principle, according to formula 1 as can be known, and r dNot only with I uAnd I dRelevant, go back and R 0Value closely related since R 0Be r uWith r dAnd, so when the wire electrode variations in temperature, R 0Also should change, but this method is supposed R 0Temperature independent, be contradiction therefore, its wire electrode temperature detection and result of calculation are inevitable inaccurate.
Summary of the invention
Goal of the invention of the present invention is to utilize indirect temp measuring method, and a kind of temperature detector for electric spark wire cutting processing electrode wire is provided.
What the present invention adopted is a kind of indirect temp measuring method, and it carries out the measurement of wire electrode temperature based on the thermal resistance principle of metal.Fig. 1 is the thermal resistance effect schematic diagram of copper, two kinds of metals of platinum.As shown in Figure 1, copper, two kinds of resistance relative change rates wiry of platinum and temperature are approximate linear.The linearity of copper is not so good as platinum as we know from the figure, but the temperature coefficient of copper wire is big than platinum filament, so copper also is one of thermal resistance common used material.As the temperature survey object be the wire electrode that is used for Wire EDM, when the material of wire electrode was copper, the wire electrode that is in the processing seam was the equal of one section thermal resistance.When the temperature of wire electrode changes, by measuring the resistance of this section resistance, the mean temperature that can obtain this segment electrode silk according to good temperature of prior demarcation and the relation between the resistance again.
A kind of temperature detector for electric spark wire cutting processing electrode wire, this device mainly partly is made up of four-wire system probe, constant-current source, oscillograph, differential amplifier, and wherein, constant-current source links to each other with the power supply brush of processing machine by Line 1 and No. 4 lines of four-wire system probe; The input of differential amplifier by four-wire system probe No. 2 and No. 3 lines link to each other with the power supply brush; The output of differential amplifier links to each other with oscillographic input port; The sampling trigger signal that is provided by processing machine inserts oscillographic input port.
For the minor variations of measurement electrode silk resistance with temperature, the general uneven bridge-type measuring circuit that adopts three-wire system or four-wire system, but found through experiments, after wire electrode and processing machine come in contact, wire electrode place branch arm is introduced the bigger interfering signal of amplitude, then do not have this interference in another branch road that is made of fixed resistance, differential circuit can't effectively suppress this interference, has greatly influenced explanation and collection to useful signal.Therefore this device adopts small resistance signal deteching circuit, measuring electric current is provided by constant-current source, but measuring-signal no longer drawn by bridge circuit, but directly draws at the two ends of wire electrode, the interference of input differential amplifier circuit is exactly a common-mode signal like this, can effectively suppress.
A kind of temperature detector for electric spark wire cutting processing electrode wire circuit, this device circuit:
(1) constant-current source: form by D.C. regulated power supply Uref, voltage-stablizer U1, constant-current source control amplifier A0, current control resistor RS, divider resistance R1 and R2, four-wire system probe, adjustment pipe Q1.The connecting relation of each several part is:
The input termination D.C. regulated power supply Uref of voltage-stablizer U1, the earth terminal ground connection of U1, the signal input part 18 of the output termination A0 of U1;
The signal input part 18 of constant-current source control amplifier A0 connects the output of U1, and the output 20 of A0 connects the base stage of Q1, and the negative-feedback end 19 of A0 connects the emitter stage of Q1 and links with the upper end of RS;
Adjust the base stage of pipe Q1 and the output 20 of A0 and link, the emitter stage of Q1 connects the upper end of RS and links with the negative-feedback end 19 of A0, and the colelctor electrode of Q1 connects the lower end of divider resistance R2;
The negative-feedback end of the emitter stage of the last termination Q1 of current control resistor RS and A0, the direct ground connection in the lower end of RS;
The last termination D.C. regulated power supply Uref of divider resistance R1.
(2) four-wire system probe: the Line 1 of described four-wire system probe and No. 2 common upper ends of inserting wire electrode to be measured of line left end, insert the lower end of wire electrode jointly with No. 4 line left ends No. 3 of probe, the Line 1 right-hand member of probe inserts the lower end of divider resistance R1, No. 2 line right-hand members of probe insert the input 9 of A1, No. 3 line right-hand members of probe insert the input 16 of A2, and No. 4 line right-hand members of probe insert the upper end of R2;
(3) differential amplifier: form by operational amplifier A 1, operational amplifier A 2, prime multiplication factor adjustment resistance R 5 and Rw, operational amplifier A 3, back level multiplication factor adjustment resistance R 6 and R7.The annexation of each several part is:
The input 9 of A1 links with No. 2 line right-hand members of probe, the output signal of A1 is that the resistance of R5 inserts the feedback end 10 of A1 and links with the upper end of Rw through resistance, and the output signal of A1 is that the resistance of R6 and the positive input 12 of operational amplifier A 3 link through resistance simultaneously;
The input 16 of A2 links with No. 3 line right-hand members of probe, the output signal of A2 is that the resistance of R5 inserts the feedback end 15 of A2 and links with the lower end of Rw through resistance, and the output signal of A2 is that the resistance of R6 and the reverse input end 13 of operational amplifier A 3 link through resistance simultaneously;
The output signal process resistance of operational amplifier A 3 is the positive input 12 that the resistance of R7 feeds back to A3, and the signal that inserts A3 reverse input end 13 is the resistance eutral grounding of R7 through resistance simultaneously.
The output of differential amplifier links to each other with oscillographic input port; The sampling trigger signal that is provided by processing machine inserts oscillographic input port.
Principle of the present invention is: what this measurement mechanism detected is the pressure reduction at wire electrode two ends, what characterize is the all-in resistance of wire electrode, because this resistance is very little when normal temperature, it is also little with the variation of temperature amount, signal therefore to be checked is saturated through guaranteeing promptly can not cause after suitably amplifying, and can tell variation of temperature again.The principle of the differential amplifier section of this circuit is:
Suppose the resistance R of flowing through wElectric current be i, then following equation group is set up
( U o 1 - U i 1 ) / R 5 = i ( U i 1 - U i 2 ) / R w = i ( U i 2 - U o 2 ) / R 5 = i
Can draw the output voltage U of amplifier A1 according to following formula O1And the output voltage U of A2 O2Respectively and the pass between the input voltage be:
U o 1 = iR 5 + U i 1 = R 5 R w ( U i 1 - U i 2 ) + U i 1 U o 2 = U i 2 - iR 5 = U i 2 - R 5 R w ( U i 1 - U i 2 )
And amplifier A3 voltage U oFor:
U o = R 7 R 6 ( U o 1 - U o 2 ) = R 7 R 6 · ( 1 + 2 R 5 R w ) ( U i 1 - U i 2 )
Amplifier A3 is output as voltage U o, also should be converted into the temperature change value Δ T of wire electrode a, its principle is: the variable quantity of supposing output voltage is Δ U o=U o-U O0, then the pass between it and the wire electrode change in resistance amount is:
ΔR t = ΔU o i 1 · K A
In the formula, i 1Be constant-current source output current, K ABe the total multiplication factor of circuit, and according to the thermal resistance principle, the variations in temperature Δ T of wire electrode aWith Δ R tFollowing relation is arranged:
ΔT a = ΔR t R t 0 1 α
In the formula, α is the temperature coefficient of wire electrode material, R t 0 = U o 0 i 1 · K A Be the resistance value before the wire electrode intensification, above-mentioned two formula simultaneous can get the temperature variation of wire electrode and the pass between the output voltage is:
ΔT a = U o - U o 0 U o 0 · 1 α
The present invention obtains the mean temperature variable quantity of wire electrode indirectly by the minor variations of measurement electrode silk resistance value.Finish moment in discharge pulse off time or discharge wire electrode is applied a constant current, when wire electrode resistance changes with temperature, because current constant, so the output voltage at wire electrode two ends only is directly proportional with wire electrode resistance.Because this voltage signal is very faint, also need after amplifying circuit amplifies, to sample again.Advantage of the present invention is to finish the resistance of instantaneous measurement wire electrode in discharge, has avoided the interference effect that causes because of discharge.Utilize indirect temp measuring method, for the electric spark wire cutting processing electrode wire temperature detection provides a kind of device again.
Description of drawings
Fig. 1 is the thermal resistance effect schematic diagram of copper, two kinds of metals of platinum.
Fig. 2 is apparatus of the present invention schematic diagrames.
Fig. 3 is a kind of apparatus of the present invention circuit diagram.
Fig. 4 is a checkout gear output signal schematic diagram, and wherein, figure a is the original record that discharge finishes the output voltage of moment temperature measurement circuit, and figure b is the filtered waveform of process FFT.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described.
Shown in Figure 1 is the thermal resistance effect schematic diagram of copper, two kinds of metals of platinum.Copper, two kinds of resistance relative change rates wiry of platinum and temperature are approximate linear.The linearity of copper is not so good as platinum as we know from the figure, but the temperature coefficient of copper wire is big than platinum filament, so copper also is one of thermal resistance common used material.As the temperature survey object be the wire electrode that is used for Wire EDM, when the material of wire electrode was copper, the wire electrode that is in the processing seam was the equal of one section thermal resistance.
Fig. 2 is apparatus of the present invention schematic diagrames.A kind of temperature detector for electric spark wire cutting processing electrode wire, this device mainly partly is made up of four-wire system probe, constant-current source, oscillograph, differential amplifier, and wherein, constant-current source links to each other with the power supply brush of processing machine by Line 1 and No. 2 lines of four-wire system probe; The input of differential amplifier by four-wire system probe No. 3 and No. 4 lines link to each other with the power supply brush; The output of differential amplifier links to each other with oscillographic input port; The sampling trigger signal that is provided by processing machine inserts oscillographic input port.
Fig. 3 is a kind of apparatus of the present invention circuit diagram.A kind of temperature detector for electric spark wire cutting processing electrode wire, this device is made of four-wire system probe, constant-current source and differential amplifier, its circuit connecting relation as shown in Figure 3:
1. constant-current source: form by D.C. regulated power supply Uref, voltage-stablizer U1, constant-current source control amplifier A0, current control resistor RS, divider resistance R1 and R2, adjustment pipe Q1.The connecting relation of each several part is:
The input termination D.C. regulated power supply Uref of voltage-stablizer U1, the earth terminal ground connection of U1, the signal input part 18 of the output termination A0 of U1;
The signal input part 18 of constant-current source control amplifier A0 connects the output of U1, and the output 20 of A0 connects the base stage of Q1, and the negative-feedback end 19 of A0 connects the emitter stage of Q1 and links with the upper end of RS;
Adjust the base stage of pipe Q1 and the output 20 of A0 and link, the emitter stage of Q1 connects the upper end of RS and links with the negative-feedback end 19 of A0, and the colelctor electrode of Q1 connects the lower end of divider resistance R2;
The negative-feedback end of the emitter stage of the last termination Q1 of current control resistor RS and A0, the direct ground connection in the lower end of RS;
The last termination D.C. regulated power supply Uref of divider resistance R1.
2. four-wire system is popped one's head in: the Line 1 of four-wire system probe and the common upper end of inserting wire electrode to be measured of the left end of No. 2 lines, No. 3 lines of probe and No. 4 line left ends insert the lower end of wire electrode jointly, the Line 1 right-hand member of probe inserts the lower end of divider resistance R1, No. 2 line right-hand members of probe insert the input 9 of A1, No. 3 line right-hand members of probe insert the input 16 of A2, and No. 4 line right-hand members of probe insert the upper end of R2;
3. differential amplifier: by operational amplifier A 1, operational amplifier A 2, prime multiplication factor adjust resistance R 5 and Rw, operational amplifier A 3, back level multiplication factor adjusts resistance R 6 and R7 forms.The annexation of each several part is:
The input 16 of A1 links with No. 2 line right-hand members of probe, the output signal of A1 is that the resistance of R5 inserts the feedback end 10 of A1 and links with the upper end of Rw through resistance, and the output signal of A1 is that the resistance of R6 and the positive input 12 of operational amplifier A 3 link through resistance simultaneously;
The input 3 of A2 links with No. 3 line right-hand members of probe, the output signal of A2 is that the resistance of R5 inserts the feedback end 15 of A2 and links with the lower end of Rw through resistance, and the output signal of A2 is that the resistance of R6 and the reverse input end 13 of operational amplifier A 3 link through resistance simultaneously;
The output signal process resistance of operational amplifier A 3 is the positive input 12 that the resistance of R7 feeds back to A3, and the signal that inserts A3 reverse input end 13 is the resistance eutral grounding of R7 through resistance simultaneously.
Utilize said apparatus to carry out the thermometric experiment, processing machine is the Makino EU64 type thread feed electric spark wire cutting machine of being careful, and thickness of workpiece is 50mm, and workpiece material is a hard alloy steel, and it is the brass wire of 0.2mm that wire electrode is selected diameter for use.
By this device to test, test result as shown in Figure 4.Fig. 4 is a checkout gear output signal schematic diagram, and wherein, figure a is the original record that discharge finishes the output voltage of moment temperature measurement circuit, and figure b is the filtered waveform of process FFT.Output voltage descends and downward trend with the wire electrode temperature as can be seen from Figure 4.The mean temperature that records wire electrode after this output signal is handled through converting is 150 ℃.

Claims (2)

1. a temperature detector for electric spark wire cutting processing electrode wire is characterized in that, this device mainly comprises four parts: four-wire system probe, constant-current source, oscillograph and differential amplifier;
Constant-current source links to each other with the power supply brush of extraneous processing machine by Line 1 and No. 4 lines of described four-wire system probe;
The input of described differential amplifier links to each other with the power supply brush of extraneous processing machine by No. 2 lines and No. 3 lines of described four-wire system probe; The output of differential amplifier links to each other with oscillographic input port;
The sampling trigger signal that is provided by extraneous processing machine inserts oscillographic another input port;
Finish moment in discharge pulse off time or discharge, constant-current source applies a constant current by Line 1 and No. 4 lines to wire electrode, wire electrode voltage between No. 2 and No. 3 lines amplifies back input oscillograph by differential amplifier, calculates the mean temperature of wire electrode at last according to oscillographic output voltage.
2. a kind of temperature detector for electric spark wire cutting processing electrode wire according to claim 1 is characterized in that,
Described constant-current source is made up of D.C. regulated power supply Uref, voltage-stablizer U1, constant-current source control amplifier A0, current control resistor RS, divider resistance R1 and divider resistance R2, adjustment pipe Q1; The connecting relation of each parts is: the input termination D.C. regulated power supply Uref of voltage-stablizer U1, the earth terminal ground connection of voltage-stablizer U1, the signal input part (18) of the output termination constant-current source control amplifier A0 of voltage-stablizer U1; The signal input part (18) of constant-current source control amplifier A0 connects the output of voltage-stablizer U1, the output (20) of constant-current source control amplifier A0 connects the base stage of adjusting pipe Q1, and the negative-feedback end (19) of constant-current source control amplifier A0 connects the emitter stage of adjusting pipe Q1 and links with the upper end of current control resistor RS; Adjusting the base stage of pipe Q1 and the output (20) of constant-current source control amplifier A0 links, the emitter stage of adjusting pipe Q1 connects the upper end of current control resistor RS and links with the negative-feedback end (19) of constant-current source control amplifier A0, and the colelctor electrode of adjusting pipe Q1 connects the lower end of divider resistance R2; The last termination of current control resistor RS is reconciled the emitter stage of pipe Q1 and the negative-feedback end of constant-current source control amplifier A0, the lower end ground connection of current control resistor RS; The last termination D.C. regulated power supply Uref of divider resistance R1;
Described four-wire system probe, the Line 1 of probe and No. 2 common upper ends of inserting wire electrode to be measured of line left end, No. 3 lines of probe and the left end of No. 4 lines insert the lower end of wire electrode jointly, the Line 1 right-hand member of probe inserts the lower end of divider resistance R1, No. 2 line right-hand members of probe insert the input (9) of described differential amplifier operational amplifier A 1, No. 3 line right-hand members of probe insert the input (16) of described differential amplifier operational amplifier A 2, and No. 4 line right-hand members of probe insert the upper end of divider resistance R2;
Described differential amplifier, by operational amplifier A 1, operational amplifier A 2, the prime multiplication factor is adjusted resistance R 5, Rw, operational amplifier A 3, back level multiplication factor is adjusted resistance R 6, R7 forms; The output signal of operational amplifier A 1 is that the resistance of R5 inserts the feedback end (10) of operational amplifier A 1 and links with upper end that the prime multiplication factor is adjusted resistance R w through resistance, and the output signal of operational amplifier A 1 is that the resistance of R6 and the positive input (12) of operational amplifier A 3 link through resistance simultaneously; The output signal of operational amplifier A 2 is that the resistance of R5 inserts the feedback end (15) of operational amplifier A 2 and links with lower end that the prime multiplication factor is adjusted resistance R w through resistance, and the output signal of operational amplifier A 2 is that the resistance of R6 and the reverse input end (13) of operational amplifier A 3 link through resistance simultaneously; The output signal process resistance of operational amplifier A 3 is the positive input (12) that the resistance of R7 feeds back to operational amplifier A 3, and the signal that inserts operational amplifier A 3 reverse input ends (13) is the resistance eutral grounding of R7 through the resistance letter simultaneously.
CNB2006100121637A 2006-06-09 2006-06-09 Temperature detector for electric spark wire cutting processing electrode wire Expired - Fee Related CN100386170C (en)

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CN103567676B (en) * 2013-10-24 2015-10-28 清华大学 The measuring method of LASER HEAT wire bond welding wire temperature
CN111331492B (en) * 2020-03-23 2021-05-25 海安同盟机械科技有限公司 Equipment for measuring vehicle body fender by utilizing cutting spark

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS631536B2 (en) * 1979-07-11 1988-01-13 Sanyo Electric Co
WO1994002277A1 (en) * 1992-07-21 1994-02-03 Fanuc Ltd Wire temperature measuring method for wire electrical discharge machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS631536B2 (en) * 1979-07-11 1988-01-13 Sanyo Electric Co
WO1994002277A1 (en) * 1992-07-21 1994-02-03 Fanuc Ltd Wire temperature measuring method for wire electrical discharge machine
US5590964A (en) * 1992-07-21 1997-01-07 Fanuc Ltd Wire temperature measuring method for a wire electric discharge machine
US5725307A (en) * 1992-07-21 1998-03-10 Fanuc Ltd. Wire temperature distribution measuring method for a wire electric discharge machine

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