WO2002058875A1 - Elektrodenführung für erodiermaschinen sowie verfahren zum erodieren von werkstücken - Google Patents
Elektrodenführung für erodiermaschinen sowie verfahren zum erodieren von werkstücken Download PDFInfo
- Publication number
- WO2002058875A1 WO2002058875A1 PCT/DE2002/000260 DE0200260W WO02058875A1 WO 2002058875 A1 WO2002058875 A1 WO 2002058875A1 DE 0200260 W DE0200260 W DE 0200260W WO 02058875 A1 WO02058875 A1 WO 02058875A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode guide
- electrode
- pressing part
- guide according
- holding part
- Prior art date
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
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
-
- 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
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
- B23H7/105—Wire guides
-
- 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
- B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
- B23H7/265—Mounting of one or more thin electrodes
Definitions
- the present invention relates to an electrode guide for eroding machines and a method for eroding workpieces.
- Spark erosion machines are known in a variety of configurations in the prior art. Such machines are used, for example, to produce bores. Ceramic tubes are used as electrode guides, for example, or hard metal collets with a lateral clamping mechanism are used. With these known electrode guides, the tolerances of the clamping position of the electrode with respect to the axis of rotation are 5 ⁇ m, as a result of which they are relatively imprecise for producing microbores.
- conical micro bores with a precisely defined front or rear width is particularly problematic.
- Such micro bores have so far not been achieved in series production with an acceptable tolerance of 1 ⁇ m.
- conical micro-holes can only be created to a limited extent through adjustments to the erosion parameters.
- conical bores are generated by an increased removal rate as the depth of the bore increases, or a rotating wire electrode is excited to vibrate with increasing depth of the bore in order to describe a cone-shaped path.
- tolerances in the range of 1 ⁇ m would be desirable.
- H- fr 3 3 HS 1+ ⁇ O tr IQ 3 -> tt C 0) H tr 3 3 CD ⁇ tr> tr
- CD 0 ⁇ 3 Hi o H- ⁇ 3 HJ.
- LQ LQ ⁇ TJ M H- ⁇ H- 0 3 H "- tr 3 c-- 3 H-tt Hf H- Hl 0) 0 3 H- N 0 ⁇ ⁇ C ⁇ H- rt Hi ⁇ CD 3 LQ tr D. ⁇ Hj ⁇
- CD rr ⁇ tr 3 ⁇ ⁇ C 0> tr rr LQ 3 rr - o Hi H- ⁇
- the groove-shaped recess is preferably V-shaped in section and formed either only in the holding part or only in the pressing part.
- the pressing part is pressed against the holding part by means of a spring element or by means of a weight. Precise guidance can thus be ensured.
- the pressure force of the pressure part can be adjusted. For example, at
- Providing the pressing force by means of a weight can be arranged displaceably via a lever arm and exert a different force on the pressing part depending on its position.
- the weight is preferably adjustable via a thread.
- a spring plate can be provided as a spring element, the spring force of which can be adjusted via adjustable stops. The pressing force is selected in each case in such a way that the eroding process can run smoothly.
- the electrode guide is preferably arranged in a rotating manner
- the electrode is particularly preferably arranged in a rotating manner. If the electrode guide is also arranged to rotate, the electrode preferably rotates at the same speed as the electrode guide.
- a pivoting device is also provided in order to pivot the electrode guide.
- the electrode guide is preferably pivoted by a swivel angle of ⁇ 2 ° about an axis in the feed direction in which the electrode wire is arranged. With a rotating electrode falls the axis in the feed direction and the axis of rotation together.
- the pivoting device allows the electrode guide to be set at an angle relative to the axis of rotation. This makes it possible, in particular, to produce bores which have a taper, it being possible for bores to be produced which decrease conically from the side of the electrode insertion (bores with a protrusion), and for bores which are based on flaring the side of the electrode entry (holes with a rear width).
- the conical holes can be made with a smooth surface line.
- an alignment device is further preferably provided.
- the alignment device is particularly preferred in one
- the alignment device can e.g. be constructed in such a way that it has four screws arranged in the rotary head, each of which abuts from a different side of the electrode guide and the electrode guide is centered between them. As a result, the position of the electrode guide can be moved in any radial direction parallel to the axis of rotation of the electrode.
- the pressing part is advantageously formed with a further recess in its central region towards the electrode.
- the electrode is pressed and guided against the holding part only over two regions of the pressing part.
- the electrode is pressed against the holding part only at the two ends of the pressing part.
- the electrode guide is particularly preferably arranged in the rotary head, which is mounted in a bridge. Precision bearings are used to support the rotary head.
- the bridge is preferably mounted so as to be displaceable in the axial direction in a spindle of the eroding machine via play-free ball guides.
- the electrode guide is preferably located axially between the spindle and the workpiece to be machined.
- the stop is particularly preferably designed to be adjustable.
- the rotary head is preferably driven by the spindle via a driver.
- the electrode guide is advantageously produced from an Al 2 0 3 ceramic or from hard metal or from steel.
- an electrode guide comprises a holding part and a pressing part, a groove-shaped recess being provided in the holding part and / or in the pressing part.
- An electrode is arranged between the holding part and the pressing part.
- the pressing part is pressed against the holding part by means of a pretensioning device.
- the electrode is also arranged to rotate, with only the electrode being advanced for eroding and the electrode guide remaining at a defined distance from the workpiece in the direction of advance.
- bores with a tolerance of + 1 ⁇ m can be produced according to the invention.
- the electrode guide is preferably arranged in a rotating manner.
- the electrode guide can preferably be pivoted by means of a pivoting device, so that the electrode guide and thus also the electrode emerging from the electrode guide is inclined to the axis of rotation.
- conical bores can be produced both with a protrusion and with a rear width in a rotating electrode guide.
- the electrode guide is displaced parallel to the axis of rotation of the electrode in such a way that the point of entry of the electrode on the workpiece, which was tilted by means of the swivel device, lies exactly on the axis of rotation of the electrode guide. If the electrode is now advanced, the rotating electrode is described as a conical movement, so that a conical bore with a rear width is produced, the central axis of the bore being located on the axis of rotation of the electrode guide. If a conical bore with a protrusion is to be produced, the electrode guide is displaced in the direction parallel to the axis of rotation in such a way that an entry position of the electrode in the workpiece is due to the large diameter of the bore (27) to be produced.
- conical bores with a back width of 0 to 100 ⁇ m to a depth of 1 mm with a straight surface line.
- parallel displacement or the pivoting of the electrode guide can also be carried out by an automatic control and can also be changed during the machining process.
- Figure 1 is a schematic sectional view of an eroding machine with an electrode guide according to the invention according to a first embodiment of the present invention
- FIG 2 is an enlarged sectional view of the electrode guide according to the invention shown in Figure 1;
- Figure 3 is an enlarged side view of the electrode guide according to the first embodiment
- FIG. 4 is a schematic representation of the invention
- FIG. 5 is a schematic representation of the invention
- FIG. 6 shows an enlarged side view of an electrode guide according to a second exemplary embodiment of the present invention.
- FIG. 7 shows an enlarged side view of an electrode guide according to a third exemplary embodiment of the present invention.
- Figure 8 is a plan view of an electrode guide according to the invention according to a fourth embodiment of the present invention.
- FIG. 1 A first exemplary embodiment of an electrode guide according to the invention according to a first exemplary embodiment is described below with reference to FIGS. 1 to 3.
- the electrode guide 1 according to the invention includes a holding part 2 and a pressing part 3.
- the pressing part 3 is pressed against the holding part 2 via a pretensioning device 6.
- a rotating electrode 4 in the form of a wire is guided between the holding part and the pressing part.
- the electrode 4 is driven by an electrode spindle 18.
- a recess 25 is provided in the pressing part 3 (see FIG. 3), so that the electrode rests on the pressing part 3 only at its two ends.
- the holding part 2 has a groove-shaped recess 5, which is V-shaped in section and partially receives the electrode 4. Exactly three contact points are thus provided between the electrode guide 1 and the electrode 4.
- the pretensioning device 6 comprises a spring element 7, the spring force of which acts on the pressing part 3 via a fastening device 9.
- the electrode 4 is securely in the electrode guide
- the strength of the spring force can be adjusted using an adjusting screw 28.
- a screw 29 is used to fix the spring element.
- a pivot device 10 is further provided.
- the pivoting device 10 comprises a first screw 12 and a second screw 13.
- the electrode guide 1 can be pivoted about a pivot point 11.
- the electrode guide 1 can be inclined at a certain angle relative to the axis of rotation X-X of the electrode 4.
- an alignment device 14 is provided, which is adjustable via four adjusting screws 24. For reasons of a simplified representation, only one adjusting screw 24 is shown in FIG. Via the alignment device 14 the electrode guide 1 can be moved parallel to the axis of rotation XX.
- the electrode guide 1 is arranged in a rotary head 15 via the alignment device 14.
- the rotary head 15 is mounted in a bridge 17 by means of precision bearings 16.
- the bridge 17 is mounted with two guide rods via play-free ball guides 20 in the spindle of the eroding machine so that it can be displaced in the axial direction.
- the eroding spindle 18 drives the rotary head 15 via a driver 19.
- the electrode guide 1 also rotates at the same speed as the electrode 4.
- the electrode 4 can be clamped by means of an electrode clamp 23 and can thereby be pushed out of the electrode guide 1 stepwise or continuously in order to erode a bore in a workpiece 26.
- the bridge 17 strikes an adjustable stop 21 which is arranged on a machine table 22.
- the distance between the electrode 4 and the workpiece 26 can be continuously adjusted in accordance with the requirements of the eroding process.
- the rotating electrode 4 is now advanced by means of the electrode clamp 23.
- the likewise rotating electrode guide 1 remains at a defined distance A from the workpiece 26 (cf. FIG. 1).
- the electrode clamp 23 does not influence the position of the electrode relative to the axis of rotation XX, so that the concentricity of the electrode 4 can be maintained with an accuracy of ⁇ 1 ⁇ m by the electrode guide 1.
- the electrode guide 1 according to the invention also is suitable for standing electrodes and thus other hole shapes or recesses can also be produced, for example by means of profile electrodes.
- conical bores and in particular conical bores with a rear width can also be produced by means of the electrode guide 1 according to the invention and the method according to the invention.
- the bore is designed such that the bore diameter increases with increasing depth of the bore.
- Such a bore 27 with rear width is e.g. shown in Figure 4.
- the electrode guide 1 is first pivoted about the pivot point 11 by means of the screws 12, 13 of the pivoting device 10. The extent of the pivoting movement depends on the type of taper desired.
- the electrode guide 1 is usually pivoted through an angle ⁇ of 0 ° to approximately 2 °. This will slightly bend the electrode wire.
- the electrode guide 1 is then moved parallel to the axis of rotation X-X by means of the alignment device 14.
- the electrode guide 1 is displaced parallel to the axis of rotation X-X until the point of entry of the electrode 4 into the workpiece 26 lies exactly on the original axis of rotation X-X (cf. FIG. 4).
- the electrode guide 1 thus rotates about the axis of rotation X-X, its tip being close to the axis of rotation. If the rotating electrode 4 is now advanced, it describes a movement on a conical jacket, as a result of which a conical bore 27 with a rear width is produced.
- FIG. 5 shows the production of a bore with a forerunner.
- the electrode guide 1 is pivoted through an angle ⁇ and then moved parallel to the axis of rotation XX. In this case, however, the electrode guide 1 is shifted in parallel such that the entry point HS c
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)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2003-7009806A KR20030072387A (ko) | 2001-01-25 | 2002-01-25 | 스파크 침식기용 전극 가이드 및 제품을 스파크 침식하는방법 |
EP02708160A EP1353772A1 (de) | 2001-01-25 | 2002-01-25 | Elektrodenführung für erodiermaschinen sowie verfahren zum erodieren von werkstücken |
JP2002559198A JP2004516951A (ja) | 2001-01-25 | 2002-01-25 | 火花浸食機用の電極案内並びにワークを火花浸食加工する方法 |
US10/624,341 US7009134B2 (en) | 2001-01-25 | 2003-07-22 | Electrode guide for spark-erosion machines and a method for the spark-erosion of workpieces |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001103292 DE10103292B4 (de) | 2001-01-25 | 2001-01-25 | Elektrodenführung für Erodiermaschinen sowie Verfahren zum Erodieren von Werkstücken |
DE20120252.2 | 2001-01-25 | ||
DE10103292.7 | 2001-01-25 | ||
DE20120252U DE20120252U1 (de) | 2001-01-25 | 2001-01-25 | Elektrodenführung für Erodiermaschinen |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/624,341 Continuation US7009134B2 (en) | 2001-01-25 | 2003-07-22 | Electrode guide for spark-erosion machines and a method for the spark-erosion of workpieces |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002058875A1 true WO2002058875A1 (de) | 2002-08-01 |
Family
ID=26008321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/000260 WO2002058875A1 (de) | 2001-01-25 | 2002-01-25 | Elektrodenführung für erodiermaschinen sowie verfahren zum erodieren von werkstücken |
Country Status (7)
Country | Link |
---|---|
US (1) | US7009134B2 (de) |
EP (1) | EP1353772A1 (de) |
JP (1) | JP2004516951A (de) |
KR (1) | KR20030072387A (de) |
CN (1) | CN100415429C (de) |
DE (1) | DE20120252U1 (de) |
WO (1) | WO2002058875A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1584397A3 (de) * | 2004-03-19 | 2006-01-18 | Robert Bosch Gmbh | Vorrichtung zum Erodieren konischer Bohrungen |
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DE102004054587B3 (de) * | 2004-11-11 | 2006-05-18 | Siemens Ag | Verfahren zum Herstellen von reproduzierbaren Mikrobohrungen sowie Vorrichtung dafür |
DE102005027844A1 (de) * | 2005-06-16 | 2006-12-28 | Robert Bosch Gmbh | Werkzeug zur elektro-chemischen Bearbeitung einer Kraftstoff-Einspritzvorrichtung |
US7964817B2 (en) * | 2007-05-17 | 2011-06-21 | Aa Edm Corporation | Electrical discharge machine apparatus for reverse taper bores |
CN101318244B (zh) * | 2008-05-22 | 2010-04-14 | 清华大学 | 微细倒锥孔电火花加工电极运动导向机构 |
WO2010013315A1 (ja) | 2008-07-29 | 2010-02-04 | 三菱電機株式会社 | 細孔放電加工装置及び放電加工方法 |
JP5251706B2 (ja) * | 2009-04-27 | 2013-07-31 | トヨタ自動車株式会社 | 孔加工治具 |
CN102069249B (zh) * | 2010-12-10 | 2012-09-05 | 清华大学 | 用于微细倒锥孔电火花加工的锥角推摆机构 |
CN102069251B (zh) * | 2011-02-25 | 2012-05-30 | 苏州明谷纳科技有限公司 | 倒锥微孔的电火花加工方法 |
CN102294525B (zh) * | 2011-08-22 | 2013-04-10 | 无锡微研有限公司 | 电火花加工微细倒锥孔的锥角滚摆机构 |
CN102861957B (zh) * | 2012-10-16 | 2015-03-11 | 苏州大学 | 一种倒锥孔的电火花加工方法及装置 |
CN103752961B (zh) * | 2013-12-11 | 2016-06-22 | 山东鲁南机床有限公司 | 一种高精密旋转电火花加工喷孔倒锥机构 |
CN104014891A (zh) * | 2014-06-18 | 2014-09-03 | 哈尔滨工业大学 | 一种微细电火花微孔加工锥度调节双导向装置 |
US11602798B2 (en) * | 2015-10-23 | 2023-03-14 | Cummins Inc. | Electrical discharge machining method for generating variable spray-hole geometry |
US9776267B1 (en) * | 2016-06-14 | 2017-10-03 | Johnson Technology, Inc. | Electrical discharge machining electrode holder |
CN109926674A (zh) * | 2019-05-05 | 2019-06-25 | 中国工程物理研究院激光聚变研究中心 | 一种用于电火花加工的微细电极丝夹持装置 |
Citations (8)
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JPS5615933A (en) * | 1979-07-13 | 1981-02-16 | Mitsubishi Electric Corp | Electrospark machining device |
JPS5733922A (en) * | 1980-07-31 | 1982-02-24 | Matsushita Electric Ind Co Ltd | Electric discharge machining device for fine hole |
JPS6067032A (ja) * | 1983-09-21 | 1985-04-17 | Hitachi Ltd | 放電加工用電極連続繰出し装置 |
EP0286779A2 (de) * | 1987-04-16 | 1988-10-19 | Raycon Textron Inc. | Drahtführung für Funkenerosionsmaschine |
US5391850A (en) * | 1994-01-28 | 1995-02-21 | Ford Motor Company | Apparatus and method for fast hole drilling by electrical discharge machining |
DE19548001A1 (de) * | 1995-12-21 | 1997-06-26 | Daimler Benz Ag | Verfahren und Vorrichtung zur Führung wenigstens eines Drahtes in einem mikromechanischen Bauelement |
DE19804371A1 (de) * | 1997-02-04 | 1998-08-13 | Mitsubishi Electric Corp | Funkenerosionsmaschine für kleine Löcher und Funkenerosionsverfahren unter Verwendung einer derartigen Maschine |
US5951883A (en) * | 1997-07-31 | 1999-09-14 | Ann Arbor Machine Company | Floating cover electrode guide system for electric discharge machining |
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DE2019903C3 (de) | 1970-04-24 | 1973-11-22 | Aeg-Elotherm Gmbh, 5630 Remscheidhasten | Funkenerosionsmaschine |
GB1381021A (en) | 1971-02-19 | 1975-01-22 | Inoue Japax Res | Shaping method and apparatus |
CH571380A5 (de) | 1973-08-06 | 1976-01-15 | Charmilles Sa Ateliers | |
CH593114A5 (de) | 1976-02-18 | 1977-11-30 | Charmilles Sa Ateliers | |
JPS61100322A (ja) | 1984-10-18 | 1986-05-19 | Mitsubishi Electric Corp | ワイヤ放電加工装置 |
JP2519902B2 (ja) * | 1986-09-04 | 1996-07-31 | 株式会社ソディック | ワイヤカツト放電加工装置 |
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JPH01234120A (ja) * | 1988-03-15 | 1989-09-19 | Fanuc Ltd | 3点支持ダイガイド装置 |
DE3815576A1 (de) | 1988-05-10 | 1989-11-16 | Chen Ken Wang | Funkenerosionsmaschine |
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JPH0749173B2 (ja) * | 1989-10-23 | 1995-05-31 | 三菱電機株式会社 | ワイヤ放電加工装置のワイヤガイド |
GB2246975B (en) | 1990-08-18 | 1994-01-05 | Rolls Royce Plc | Multi-electrode rotation in electrical discharge machining |
US5214260A (en) * | 1991-04-03 | 1993-05-25 | Fort Wayne Wire Die, Inc. | Electrical discharge machine wire electrode guiding device |
JPH11823A (ja) | 1997-06-12 | 1999-01-06 | Mitsubishi Electric Corp | 放電加工装置 |
FR2791588B1 (fr) * | 1999-03-31 | 2001-05-04 | Snecma | Machine d'usinage par electroerosion a commande numerique |
-
2001
- 2001-01-25 DE DE20120252U patent/DE20120252U1/de not_active Expired - Lifetime
-
2002
- 2002-01-25 KR KR10-2003-7009806A patent/KR20030072387A/ko not_active Application Discontinuation
- 2002-01-25 CN CNB02804181XA patent/CN100415429C/zh not_active Expired - Fee Related
- 2002-01-25 WO PCT/DE2002/000260 patent/WO2002058875A1/de active Application Filing
- 2002-01-25 JP JP2002559198A patent/JP2004516951A/ja active Pending
- 2002-01-25 EP EP02708160A patent/EP1353772A1/de not_active Withdrawn
-
2003
- 2003-07-22 US US10/624,341 patent/US7009134B2/en not_active Expired - Lifetime
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JPS5615933A (en) * | 1979-07-13 | 1981-02-16 | Mitsubishi Electric Corp | Electrospark machining device |
JPS5733922A (en) * | 1980-07-31 | 1982-02-24 | Matsushita Electric Ind Co Ltd | Electric discharge machining device for fine hole |
JPS6067032A (ja) * | 1983-09-21 | 1985-04-17 | Hitachi Ltd | 放電加工用電極連続繰出し装置 |
EP0286779A2 (de) * | 1987-04-16 | 1988-10-19 | Raycon Textron Inc. | Drahtführung für Funkenerosionsmaschine |
US5391850A (en) * | 1994-01-28 | 1995-02-21 | Ford Motor Company | Apparatus and method for fast hole drilling by electrical discharge machining |
DE19548001A1 (de) * | 1995-12-21 | 1997-06-26 | Daimler Benz Ag | Verfahren und Vorrichtung zur Führung wenigstens eines Drahtes in einem mikromechanischen Bauelement |
DE19804371A1 (de) * | 1997-02-04 | 1998-08-13 | Mitsubishi Electric Corp | Funkenerosionsmaschine für kleine Löcher und Funkenerosionsverfahren unter Verwendung einer derartigen Maschine |
US5951883A (en) * | 1997-07-31 | 1999-09-14 | Ann Arbor Machine Company | Floating cover electrode guide system for electric discharge machining |
Non-Patent Citations (4)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 005, no. 065 (M - 066) 30 April 1981 (1981-04-30) * |
PATENT ABSTRACTS OF JAPAN vol. 006, no. 101 (M - 135) 10 June 1982 (1982-06-10) * |
PATENT ABSTRACTS OF JAPAN vol. 009, no. 206 (M - 406) 23 August 1985 (1985-08-23) * |
See also references of EP1353772A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1584397A3 (de) * | 2004-03-19 | 2006-01-18 | Robert Bosch Gmbh | Vorrichtung zum Erodieren konischer Bohrungen |
Also Published As
Publication number | Publication date |
---|---|
KR20030072387A (ko) | 2003-09-13 |
US20040056004A1 (en) | 2004-03-25 |
US7009134B2 (en) | 2006-03-07 |
DE20120252U1 (de) | 2002-05-23 |
CN1489502A (zh) | 2004-04-14 |
JP2004516951A (ja) | 2004-06-10 |
CN100415429C (zh) | 2008-09-03 |
EP1353772A1 (de) | 2003-10-22 |
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