Programmed electrode wear compensation device and method for 3d edm scanning apparatus
OwnerChin-Hui Chen, Jui-Kuan Lin +2inventors
InventorsChin-Hui Chen, Jui-Kuan Lin, Ching-Cheng Yang, Ming-Ji Chen
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Abstract
A programmed electrode wear compensation device and method for 3D EDM scanning apparatus has a compensation device which receives raw data about a working path of a working apparatus from a CAD/CAM device, calculates therefrom compensated data which take into account electrode wear and transmits the compensated data to a control device which controls the working apparatus, so that smoothness and shape of a machined surface are maintained during electric discharge.
Claims12
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A programmed electrode wear compensation device for a 3D EDM scanning apparatus, operating in conjunction with a storage device for roughness of workpiece, electrode dimensions, electrode structure and material, a storage device for discharge and empirical parameters and a CAD/CAM device, said programmed electrode wear compensation device comprising:
- an input interface, which is a user interface and is connected with said CAD/CAM device, receiving raw data therefrom;
- a computing device, calculating from said raw data compensated data for a working oath which is corrected for electrode wear;
- and
- an output interface, transmitting said compensated data to a control device controlling a working apparatus;
- wherein said compensated data include compensation rules for electrode wear, said raw data and manually input compensation data;
- and
- wherein said compensation rules comprise
- (a) working a 3D groove by clearing away various 2D layers;
- (b) working each 2D layer in a plane, using crossing working path sections;
- (c) for each 2D layer, setting a ratio r of an electrode diameter and distances of neighboring working paths by 0<r<1, preferably r=0.7;
- (d) calculating electrode wear compensation data for
- (1) working perpendicularly to said layers,
- (2) for each layer, working in a first cut,
- (3) for each layer, where distances between working path sections are smaller than a diameter of said electrode,
- (4) fine cutting;
- and
- (e) halting working, if electrode wear has exceeded a threshold that requires replacing of the electrode, resuming working after replacing of the electrode is again performed with compensation of electrode wear.
A programmed electrode wear compensation method for a 3D EDM scanning apparatus, comprising the steps of
- (a) obtaining data about roughness of a workpiece;
- (b) obtaining discharge and empirical parameters;
- (c) connecting with a CAD/CAM device delivering raw data;
- (d) obtaining compensated data for a working path considering electrode wear;
- (e) transmitting said compensated data to a control device;
- and
- (f) working said workpiece by a working apparatus controlled by said control device on the basis of said compensated data.
Dependencies are inferred from the claim text.