Traveling wire electric discharge machining apparatus capable of workpiece location determining and energy level adjustment
First Claim
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1. A traveling wire electric discharge machining apparatus comprising:
- a wire for machining a workpiece to a predetermined shape according to a predetermined machining program;
a moving table for moving said workpiece relative to said wire;
an electric discharge unit for applying a periodic voltage pulse to said wire;
means for determining a location on said workpiece, said location determined in accordance with at least one predetermined parameter, and said location being positioned before a change in a machining direction point of said predetermined machining program; and
means for changing a characteristic of said periodic voltage pulse to gradually decrease the machining energy, while said wire is moving relative to said workpiece, from when said wire is at said location until prior to said wire reaching said machining direction change point.
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Abstract
A traveling wire electric discharge machining apparatus machines a workpiece by applying periodic voltage pulses to a wire electrode while moving the wire electrode relative to the workpiece. A location on the workpiece is determined, according to a predetermined parameter. The location is before a change in machining direction of the workpiece. When the wire electrode is positioned at the determined location, a characteristic of the periodic voltage pulse is changed.
21 Citations
16 Claims
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1. A traveling wire electric discharge machining apparatus comprising:
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a wire for machining a workpiece to a predetermined shape according to a predetermined machining program; a moving table for moving said workpiece relative to said wire; an electric discharge unit for applying a periodic voltage pulse to said wire; means for determining a location on said workpiece, said location determined in accordance with at least one predetermined parameter, and said location being positioned before a change in a machining direction point of said predetermined machining program; and means for changing a characteristic of said periodic voltage pulse to gradually decrease the machining energy, while said wire is moving relative to said workpiece, from when said wire is at said location until prior to said wire reaching said machining direction change point. - View Dependent Claims (2, 3, 4, 5)
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6. A traveling wire electric discharge machining apparatus comprising:
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a wire for machining a workpiece to a predetermined shape according to a predetermined machining program; a moving table for moving said workpiece relative to said wire; an electric discharge unit for applying a periodic voltage pulse to said wire; means for determining an area on said workpiece, said area determined to include a machining direction changing point; and means for gradually changing a period of said periodic voltage pulse while said wire is moving relative to said workpiece, when said wire is positioned within said area and prior to reaching said machining direction changing point. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of machining a workpiece by discharging a traveling wire which is moved relative to said workpiece, said method comprising the steps of;
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applying a periodic voltage pulse to said wire; moving said wire relative to said workpiece in a machining direction according to a predetermined machining program; determining a location on said workpiece upstream of a point at which the machining direction changes; and as said wire is moving, changing a period of said periodic voltage pulse when said wire reaches said location. - View Dependent Claims (14, 15, 16)
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Specification