Claims
- 1. A method of measuring a value of flexure of a wire electrode, the flexure being caused by an electric discharge across a discharge gap, the method comprising the steps of:
- (a) detecting by ohmic contact detection means whether or not the wire electrode comes into contact with the workpiece when electric discharge is temporarily stopped at a predetermined measurement point during the course of electric discharge machining along a first direction in a machining groove;
- (b) retracting said wire electrode relative to said workpiece in a second direction opposite said first direction along said machining groove until the wire electrode comes out of ohmic contact with the workpiece in the case where they lie in contact, a distance of the retraction being measured, or advancing said wire electrode relative to said workpiece in said first direction until the wire electrode comes into ohmic contact with the workpiece in the case where they do not lie in ohmic contact, a distance of the advance being measured; and
- (c) calculating the flexure value in accordance with the size of the discharge gap, and the retraction distance or the advance distance.
- 2. A method of measuring a flexure value of a wire electrode as defined by claim 1, wherein in step (c), said flexure value is calculated in accordance with the following where g denotes the size of the discharge gap and .epsilon..sub.1 denotes said retraction distance:
- .epsilon.=g+.epsilon..sub.1
- (where .epsilon. indicates said flexure value).
- 3. A method of measuring a flexure value of a wire electrode as defined in claim 1, wherein in step (c), said flexure value is calculated in accordance with the following where g denotes the size of the discharge gap and .epsilon..sub.1 ' denotes said advance distance:
- .epsilon.=g-.epsilon..sub.1 '
- (where .epsilon. indicates said flexure value).
- 4. A method of measuring a flexure value of a wire electrode as defined in claim 1, wherein said method further comprises the step of:
- prior to step (a), retracting said wire electrode from said measurement point and thereafter returning the wire electrode to the workpiece while the electric discharge is being performed.
- 5. A method of measuring a flexure value of a wire electrode as defined in claim 1, wherein said method further comprises the step of: after step (b) moving said wire electrode back to said measurement point.
- 6. A method of measuring flexure of a wire electrode as defined by claim 1, wherein the discharge gap size is obtained by the following:
- .epsilon.g=(l-.phi.)/2,
- where L indicates the width of the machining groove, and .phi. indicates the diameter of the wire electrode.
- 7. A method of measuring flexure of a wire electrode as defined by claim 3, wherein the discharge gap size is obtained by the following:
- .epsilon.g=(l-.phi.)/2,
- where L indicates the width of the machining groove, and .phi. indicates the diameter of the wire electrode.
Priority Claims (1)
Number |
Date |
Country |
Kind |
55-185432 |
Dec 1980 |
JPX |
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Parent Case Info
This is a continuation of co-pending application Ser. No. 413,375 filed on Aug. 25, 1982 now U.S. Pat. No. 4,521,662.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4232208 |
Buhler |
Nov 1980 |
|
4324970 |
Nanasawa |
Apr 1982 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
413375 |
Aug 1982 |
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