Wire electric discharge machine and wire electric discharge machining method
First Claim
1. A wire electric discharge machine that applies a predetermined pulse voltage between a wire electrode and a workpiece, while moving the wire electrode relatively to the workpiece along a path programmed beforehand in a machining program for skim cuts, the wire electric discharge machine includes:
- a straight line portion instructing unit that outputs, when machining a straight line portion, to a servo amplifier a straight-line-portion-machining-feed-speed instruction specifying a machining feed speed for the straight line portion,an average speed calculating unit that calculates a straight-line-portion average speed for machining the straight line portion,a corner-portion detecting unit that looks ahead the machining program and outputs, if detecting a corner portion, corner-portion detection information about a corner portion'"'"'s path,a volume ratio calculating unit that calculates, based on the corner-portion detection information, a machining volume ratio of a machining volume per a unit of distance at the corner portion to a machining volume per the unit of distance at the straight line portion,a corner-portion-machining-feed-speed calculating unit that calculates a machining feed speed for the corner portion as a product of the straight-line-portion average speed and an inverse of the machining volume ratio,a corner portion instructing unit that outputs, when machining the corner portion, to the servo amplifier, a corner-portion-machining-feed-speed instruction specifying the machining feed speed for the corner portion,wherein the machining volume per the unit of distance is an amount of a workpiece area removal when the wire electrode moves the unit of distance, from one point to another point on the programmed path,the machining volume per the unit of distance at the corner portion is equal to a portion of a sector delineated by a first arc and a second arc which have a central angle corresponding to a movement of the wire electrode from the one point to the another point on the programmed path,the first arc corresponds to the movement of the wire electrode from the one point to the another point on the programmed path in a previous cutting operation, andthe second arc corresponds to the movement of the wire electrode from the one point to the another point on the programmed path in a current cutting operation.
1 Assignment
0 Petitions
Accused Products
Abstract
Based on a discharging gap value and machining allowance value stored in a corner-control-information storing means 20, a speed-ratio calculating means 23 being a machining-volume calculating means calculates machining volumes of a straight line portion and a corner portion to calculate a volume ratio therebetween.
A corner-portion-speed calculating means 24 calculates a machining feed speed at the corner portion based on a volume ratio calculated by the speed-ratio calculating means 23, and then outputs to a servo amplifier 8 on the basis of the length of a pre-corner section outputted by a pre-corner-section calculating means 21 and the length of a post-corner section outputted by a post-corner-section calculating means 22, instructions about machining feed speeds from entering the pre-corner section till getting out of the post-corner section.
39 Citations
10 Claims
-
1. A wire electric discharge machine that applies a predetermined pulse voltage between a wire electrode and a workpiece, while moving the wire electrode relatively to the workpiece along a path programmed beforehand in a machining program for skim cuts, the wire electric discharge machine includes:
-
a straight line portion instructing unit that outputs, when machining a straight line portion, to a servo amplifier a straight-line-portion-machining-feed-speed instruction specifying a machining feed speed for the straight line portion, an average speed calculating unit that calculates a straight-line-portion average speed for machining the straight line portion, a corner-portion detecting unit that looks ahead the machining program and outputs, if detecting a corner portion, corner-portion detection information about a corner portion'"'"'s path, a volume ratio calculating unit that calculates, based on the corner-portion detection information, a machining volume ratio of a machining volume per a unit of distance at the corner portion to a machining volume per the unit of distance at the straight line portion, a corner-portion-machining-feed-speed calculating unit that calculates a machining feed speed for the corner portion as a product of the straight-line-portion average speed and an inverse of the machining volume ratio, a corner portion instructing unit that outputs, when machining the corner portion, to the servo amplifier, a corner-portion-machining-feed-speed instruction specifying the machining feed speed for the corner portion, wherein the machining volume per the unit of distance is an amount of a workpiece area removal when the wire electrode moves the unit of distance, from one point to another point on the programmed path, the machining volume per the unit of distance at the corner portion is equal to a portion of a sector delineated by a first arc and a second arc which have a central angle corresponding to a movement of the wire electrode from the one point to the another point on the programmed path, the first arc corresponds to the movement of the wire electrode from the one point to the another point on the programmed path in a previous cutting operation, and the second arc corresponds to the movement of the wire electrode from the one point to the another point on the programmed path in a current cutting operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification