WO1994002277A1 - Procede de mesure de la temperature d'un fil pour machine d'etincelage par fil - Google Patents
Procede de mesure de la temperature d'un fil pour machine d'etincelage par fil Download PDFInfo
- Publication number
- WO1994002277A1 WO1994002277A1 PCT/JP1993/000972 JP9300972W WO9402277A1 WO 1994002277 A1 WO1994002277 A1 WO 1994002277A1 JP 9300972 W JP9300972 W JP 9300972W WO 9402277 A1 WO9402277 A1 WO 9402277A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wire
- temperature
- discharge machine
- discharge
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
-
- 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
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/04—Apparatus for supplying current to working gap; Electric circuits specially adapted therefor
Definitions
- the present invention relates to a wire temperature measurement method for a wire electric discharge machine, and more particularly to a wire temperature measurement method for a wire electric discharge machine that measures a wire temperature distribution.
- the machining speed of a wire electric discharge machine is greatly affected by wire breakage. In other words, precise processing cannot be performed under processing conditions where the frequency of wire breakage is high, and processing is performed under processing conditions slightly lower than those where wire breakage occurs.
- the most important factor in wire breakage is how much and how the wire temperature is distributed during processing. In other words, if the local temperature rise of the wire during processing is slow, it is necessary to further increase the cooling of the entire wire. Conversely, if the local temperature rise is more extreme, it is important to distribute the discharge. In any case, it is currently difficult to directly measure the wire temperature, so what measures should be taken? Not clear.
- the first method of measuring the temperature of a wire is to estimate it from the temperature-strength characteristics of the wire. If the wire breaks under certain conditions, the temperature of the wire at the break is estimated from the wire tension at that time.
- the second method is an analytical method, in which calculation is performed assuming random heating in the wire length direction and the heat transfer coefficient of the wire surface.
- the second method does not consider the effect of cooling water flow in the machining groove, which governs the cooling of the wire, so it is not possible to estimate the heat transfer coefficient, and the actual wire temperature can be calculated so accurately. Unable to calculate. Disclosure of the invention
- the present invention has been made in view of such a point, and an object of the present invention is to provide a wire temperature measuring method of a wire electric discharge machine capable of accurately measuring a wire temperature.
- Another object of the present invention is to provide a wire temperature measuring method of a wire electric discharge machine capable of accurately measuring a temperature distribution.
- a wire temperature measuring method of a wire electric discharge machine capable of accurately measuring a temperature distribution.
- a resistance value of the wire is obtained from a loop current after a discharge voltage is turned off, and the wire is measured from the resistance value.
- a method for measuring a wire temperature of a wire electric discharge machine characterized by obtaining a temperature of the wire is provided.
- the wire temperature measurement method of the wire electric discharge machine which measures the temperature of the wire during machining of the wire electric discharge machine, the upper current flowing from the upper electrode during discharge and the lower current flowing from the lower electrode during discharge. From the upper current, the lower current, and the loop current after the discharge voltage is turned off, to measure a resistance value between the discharge position and the lower end of the work, and a temperature distribution of the wire from the plurality of resistance values.
- a method for measuring a temperature of a wire of an electric discharge machine characterized by measuring.
- the discharge position is calculated from the upper current and the lower current. In other words, the higher the discharge position, the higher the upper current, and the lower the discharge position, the higher the lower discharge current. Furthermore, the discharge position and the resistance of the wire at the lower end of the work are determined from the discharge position and the loop current. If these resistance values are obtained multiple times, the temperature distribution of the wire can be measured.
- Figure 1 is a circuit diagram of a measurement circuit for measuring wire temperature
- Figure 2 is a circuit diagram of a measurement circuit for measuring wire temperature distribution.
- Figure 1 is a circuit diagram of a measurement circuit for measuring the wire temperature.
- a discharge voltage is applied to the wire 1 from the power feeders 2 and 3.
- the discharge voltage is applied between the workpiece 4 and the wire 1 from the machining power supply 5.
- the wire 1 is accurately positioned by the upper guide 6 and the lower guide 7. After the discharge voltage is turned off, the loop current I L flows due to the poor impedance matching of the upper and lower feed lines 8a and 8b.
- electrodes 11 and 12 for detecting a voltage are arranged near the top and bottom of the peak 4 of the wire 1.
- the electrodes 11 and 12 have a thin annular shape surrounding the wire 1 so as not to obstruct the flow of water from the upper and lower nozzles (not shown). Therefore, the wire voltage is measured by the leakage current flowing through the water. If the polarization voltage and resistance between the wire 1 and the electrodes 11 and 12 are sufficiently smaller than the detection voltage and the resistance of the electrodes 11 and 12, accurate voltage measurement can be performed.
- loop current I L is constant processing conditions constant value Der Runode under the electrode 1 1 of the wire 1 from the voltage and loop current IL, 1 resistance between 2 can be calculated, be determined temperature from the resistance it can. In the above embodiment, the measurement for measuring the loop current is performed.
- the circuit is capacitor-coupled, it can also be configured as trans- nance-coupled.
- Fig. 2 is a circuit diagram of a measurement circuit for measuring the temperature distribution of the wire.
- the same elements as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- a pair of contacts 21 and 22 are provided between the power feeders 2 and 3, and the voltage between the contacts 21 and 22 is measured.
- the current I u 'flows from the power supply 2 side during discharge, and the current I d flows from the power supply 3 side, the voltage V between the contacts 21 and 22 becomes
- V - I u (r u + R - ri) + I d (r d + ri)
- discharge position P can be determined from the current values flowing up and down.
- V n -I un r u + I d disturb(r d + R) (2 a)
- V, -I u, (rêt+ R) + I d , r d (2 b)
- V i -I ui (r complicat-R-ri) + I d (r d + ri)
- the resistance at the lower end of the work 4 is determined. Therefore, by repeating this measurement, the temperature at many points can be measured. This can be differentiated with respect to distance to find out the temperature distribution per unit length.
- the temperature rise of the wire is about 100 ° C.
- the temperature at which the wire is broken is about 300 ° C. to 400 ° C. It is thought to be due to concentrated discharge.
- the temperature is measured from the loop current after the machining voltage is turned off, so that the temperature of the coil can be accurately measured with a simple configuration.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/199,287 US5590964A (en) | 1992-07-21 | 1993-07-13 | Wire temperature measuring method for a wire electric discharge machine |
| DE69306925T DE69306925T2 (de) | 1992-07-21 | 1993-07-13 | Verfahren zur messung der drahtelektrodetemperatur in einer drahtschneidefunkenerosionsmaschine |
| EP93916159A EP0604665B1 (en) | 1992-07-21 | 1993-07-13 | Wire temperature measuring method for wire electrical discharge machine |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4193889A JPH0631536A (ja) | 1992-07-21 | 1992-07-21 | ワイヤ放電加工機のワイヤ温度計測方法 |
| JP4/193889 | 1992-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1994002277A1 true WO1994002277A1 (fr) | 1994-02-03 |
Family
ID=16315427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1993/000972 Ceased WO1994002277A1 (fr) | 1992-07-21 | 1993-07-13 | Procede de mesure de la temperature d'un fil pour machine d'etincelage par fil |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US5590964A (ja) |
| EP (1) | EP0604665B1 (ja) |
| JP (1) | JPH0631536A (ja) |
| DE (1) | DE69306925T2 (ja) |
| WO (1) | WO1994002277A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386170C (zh) * | 2006-06-09 | 2008-05-07 | 清华大学 | 一种电火花线切割加工电极丝温度检测装置 |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5913158A (en) * | 1997-01-17 | 1999-06-15 | Sullivan; William B. | Dynamic temperature measurement |
| US9634516B2 (en) * | 2009-04-14 | 2017-04-25 | Ford Global Technologies, Llc | Method and system for monitoring temperature of a power distribution circuit |
| US9397519B2 (en) * | 2009-04-14 | 2016-07-19 | Ford Global Technologies, Llc | Method and system for controlling current of a power distribution circuit |
| US11376973B2 (en) | 2009-04-14 | 2022-07-05 | Ford Global Technologies, Llc | Method and system for monitoring temperature of a power distribution circuit |
| US20110153242A1 (en) * | 2009-12-18 | 2011-06-23 | Gm Global Technology Operations, Inc | Thermocouple measurement in a current carrying path |
| JP5474214B2 (ja) | 2010-11-19 | 2014-04-16 | 三菱電機株式会社 | ワイヤ電極アニール処理方法及びワイヤ放電加工機 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63156620A (ja) * | 1986-12-19 | 1988-06-29 | Inoue Japax Res Inc | ワイヤカツト放電加工装置 |
| JPS6416316A (en) * | 1987-03-13 | 1989-01-19 | Inoue Japax Res | Electric discharge machine |
| JPH0369648B2 (ja) * | 1985-09-02 | 1991-11-01 | Hitachi Seiko Kk |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5812537B2 (ja) * | 1975-08-13 | 1983-03-09 | エレバムセイキ カブシキガイシヤ | オンドプロフアイラ−ヨウソシ |
| JPS5721230A (en) * | 1980-07-04 | 1982-02-03 | Inoue Japax Res Inc | Positioning method in wire cut electric discharge processing |
| US4474825A (en) * | 1982-03-08 | 1984-10-02 | Northern Telecom Limited | Monitoring temperature of wire during heating |
| CH657554A5 (fr) * | 1984-07-17 | 1986-09-15 | Charmilles Technologies | Procede et dispositif pour surveiller les contraintes thermiques d'un fil-electrode sur une machine a electro-erosion. |
| JPS61288929A (ja) * | 1985-06-15 | 1986-12-19 | Fanuc Ltd | ワイヤカツト放電加工機 |
| CH673797A5 (ja) * | 1987-01-13 | 1990-04-12 | Charmilles Technologies | |
| JP2532259B2 (ja) * | 1987-10-31 | 1996-09-11 | ファナック株式会社 | ワイヤ放電加工機における放電位置検出装置 |
| JPH0783870B2 (ja) * | 1989-08-10 | 1995-09-13 | カクイ株式会社 | シート状油吸着材の製造方法 |
| JPH0741472B2 (ja) * | 1990-05-24 | 1995-05-10 | 株式会社牧野フライス製作所 | ワイヤ放電加工機の制御方法と装置 |
| JPH0552663A (ja) * | 1991-08-26 | 1993-03-02 | Sakata Denki Kk | 配水管内の長さ方向に関する平均水温の測定方法 |
| US5346307A (en) * | 1993-06-03 | 1994-09-13 | Regents Of The University Of California | Using electrical resistance tomography to map subsurface temperatures |
-
1992
- 1992-07-21 JP JP4193889A patent/JPH0631536A/ja not_active Withdrawn
-
1993
- 1993-07-13 DE DE69306925T patent/DE69306925T2/de not_active Expired - Fee Related
- 1993-07-13 US US08/199,287 patent/US5590964A/en not_active Expired - Lifetime
- 1993-07-13 WO PCT/JP1993/000972 patent/WO1994002277A1/ja not_active Ceased
- 1993-07-13 EP EP93916159A patent/EP0604665B1/en not_active Expired - Lifetime
-
1996
- 1996-02-23 US US08/606,338 patent/US5725307A/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0369648B2 (ja) * | 1985-09-02 | 1991-11-01 | Hitachi Seiko Kk | |
| JPS63156620A (ja) * | 1986-12-19 | 1988-06-29 | Inoue Japax Res Inc | ワイヤカツト放電加工装置 |
| JPS6416316A (en) * | 1987-03-13 | 1989-01-19 | Inoue Japax Res | Electric discharge machine |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP0604665A4 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386170C (zh) * | 2006-06-09 | 2008-05-07 | 清华大学 | 一种电火花线切割加工电极丝温度检测装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0604665A4 (en) | 1994-12-14 |
| DE69306925D1 (de) | 1997-02-06 |
| JPH0631536A (ja) | 1994-02-08 |
| US5725307A (en) | 1998-03-10 |
| EP0604665A1 (en) | 1994-07-06 |
| DE69306925T2 (de) | 1997-05-07 |
| EP0604665B1 (en) | 1996-12-27 |
| US5590964A (en) | 1997-01-07 |
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