Patent EP0038658A2 successfully refreshed from Google Patents.
EP0038658A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Wire-cut electric discharge machining
Assignee: Fanuc Corp
•
Filing: 1981-04-13
•
Granted: —
•
Expires: 2001-04-13
Abstract
Abstract During machining of a work 20, the feed of the wire electrode 30 and the discharge for the machining are stopped and the wire electrode 30 is moved in a direction X perpen- dicularto the machining path until it gets into contact with the wall of the work 20. The size δ of the spark gap is detected from the position where the wire electrode 30 makes contact with the work 20. A desired offset value is calculated from the detected size δ of the spark gap and the preknown wire diameter d. The machining path is corrected so thatthe center of the wire electrode 30 may lie at a position offset by the desired offset value relative to a profile desired to obtain.
Inventors
- 👤 Haruki Obara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:22
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/02; B23H7/06; B23H7/065; B23H2500/00; B23H2500/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A wire-cut, electric discharge machining method wherein the feed of a wire electrode and a discharge for machining are stopped during machining a work; the wire electrode is moved in a direction perpendicular to the machining path until it gets into contact with a wall of the work and the size of a spark gap is detected from the position of contact of the wire electrode with the work; a desired offset value is calculated from the detected size of the spark gap and the preknown wire diameter; and the machining path is corrected so that the center of the wire electrode may lie at a position offset by the desired offset value relative to a profile desired to obtain.
Claim 2
Dependent Claim
120 words
A wire-cut, electric discharge machining method wherein the feed of a wire electrode and a discharge for machining are stopped during machining a work; the wire electrode is moved in a direction perpendicular to the machining path until it gets into contact with a wall of the work and the size of a spark gap is detected from the position of contact of the wire electrode with the work; a desired offset value is calculated from the detected size of the spark gap and the preknown wire diameter; and the machining path is corrected so that the center of the wire electrode may lie at a position offset by the desired offset value relative to a profile desired to obtain.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein a calculation as aforesaid of a desired offset value takes place in a premachining path prior to machining the desired profile.
Claim 4
Dependent Claim
35 words
A method according to claim 1 or 2, wherein the . desired profile has a radius of curvature and a calculation as aforesaid of a desired offset value takes place whilst machining the desired profile.
Claim 5
Independent Claim
28 words
A method according to any one of the preceding claims, wherein the or each said calculation is repeated a plurality of times to provide a final offset value.
Claim 6
Dependent Claim
132 words
A wire-cut, electric discharge machine adapted and arranged to operate in accordance with a wire-cut, electric discharge machining method wherein the feed of a wire electrode and a discharge for machining are stopped during machining a work; the wire electrode is moved in a direction perpendicular to the machining path until it gets into contact with a wall of the work and the size of a..spark gap is detected from the position of contact of the wire electrode with the work; a desired offset value is calculated from the detected size of the spark gap and the preknown wire diameter; and the machining path is corrected so that the center of the wire electrode may lie at a position offset by the desired offset value relative to a profile desired to obtain.
Claim 7
Dependent Claim
132 words
A wire-cut, electric discharge machine adapted and arranged to operate in accordance with a wire-cut, electric discharge machining method wherein the feed of a wire electrode and a discharge for machining are stopped during machining a work; the wire electrode is moved in a direction perpendicular to the machining path until it gets into contact with a wall of the work and the size of a..spark gap is detected from the position of contact of the wire electrode with the work; a desired offset value is calculated from the detected size of the spark gap and the preknown wire diameter; and the machining path is corrected so that the center of the wire electrode may lie at a position offset by the desired offset value relative to a profile desired to obtain.
Claim 8
Dependent Claim
28 words
A machine according to claim 5, wherein a calculation as aforesaid of a desired offset value takes place in a premachining path prior to machining the desired profile.
Claim 9
Dependent Claim
34 words
A machine according to claim 5 or 6, wherein the desired profile has a radius of curvature and a calculation as aforesaid of a desired offset value takes place whilst machining the desired profile.
Claim 10
Dependent Claim
28 words
A machine according to any one of the preceding claims 5 to 7, wherein said calculation is repeated a plurality of times to provide a final offset value.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.