CNC EDM Safety Operation

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Presentation Description

Electrical Discharge Machining is a process of metal removal by means of energy release by repetitive spark discharges. these electrical discharges occur between an electrode (Cutting Tool) and an electro-conductive workpiece and minute particles are eroded from both electrode and workpiece.

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By: maxneo (124 month(s) ago)

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By: ahabal (132 month(s) ago)

more to come.........

Presentation Transcript

CNC EDM Safety Operationby: ahabal : 

CNC EDM Safety Operationby: ahabal

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EDM - Electrical Discharge Machining is a process of metal removal by means of energy release by repetitive spark discharges. these electrical discharges occur between an electrode (Cutting Tool) and an electro-conductive workpiece and minute particles are eroded from both electrode and workpiece.

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Discharge gap Metal sticks The metal of both ends becomes powder and precipitate The circuit for making metallic powder in the reference published in Germany in 1919 is indicated. HISTORY OF EDM

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Transistorized circuit EDM Servo mechanism Control circuit

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Gap controller Electrode Workpiece EDM circuit by Lazarenko (RC circuit)

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PRINCIPLE OF EDM Electrical discharge machining is a controlled metal removal technique whereby an electric spark is used to cut (erode) the workpiece, which takes a shape opposite to that of the cutting tool or electrode.The cutting tool (electrode) is made from electrically conductive material, usually carbon. The die sinking electrode, made to the shape of the cavity required, and the workpiece are both submerged in a dielectric fluid, (a light lubricating oil). This dielectric fluid should be a nonconductor (or poor conductor) of electricity.

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SAFETY a. Check that the workpiece has been set in a proper way.

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b. Check that the electrode has been set securely.

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c. Check that there is no abnormality in the discharge cable.

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d. flashing EDMing with flushing alone must be avoided

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e. If a metallic injection nozzle is used, make sure that it will not come into contact with the electrode.

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f. Make sure that the table travel will not cause any interference with the nozzle.

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g. Check that the fluid level has been set properly. Set the dielectric fluid level at not less than 50mm above the top of the workpiece.

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METHOD OF POSITIONING OF WORKPIECE AND ELECTRODE (1) Check the drawing.

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(2) Check workpiece dimension. (3) Check electrode dimension. Be cautious of clearance especially the under-size. Ex. Roughing electrode Dimension A 16.00 - 15.40 = 0.6 Dimension B 19.72 - 19.12 = 0.6 0.3 / Side

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(4) Mounting of workpiece (5) Set reference ball. (6) Center workpiece by probe.

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(7) Coordinates value set to 0. (8) Positioning of probe center to workpiece reference.

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(9) Coordinates value set to 0. (10) Center the reference ball by probe. (11) Record of distance from workpiece-reference to reference ball, or change coordinates system.

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(12) Mounting of electrode (13) Position electrode by reference ball. (14) Coordinates value set to 0.

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(15) Traveling from reference ball to workpiece-reference (16) Calculate the center distance of machining area

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(17) Positioning of electrode from workpiece-reference to the center distance of machining area.

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(18) Positioning of Z axis (19) Electrode is returned to the machining position. Machining starts after programming the machining depth and machining conditions.

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END

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