SOME ASPECTS OF AUTOMATED ELECTRICAL EROSION MACHINE WITH WIRE ELECTRODE Alin MNERIE, Aurel NANU, Dumitru MNERIE, Titus SLAVICI POLITEHNICA University of Timisoara ABSTRACT: The command with personal computer of electrical erosion machine with wire electrode can be realized with integrated hardware resources which fulfill This paper propose the description of some modern integrated systems which can to fulfill a lot of functions which must realized all in real time. It is showed some experiments with Sodick’s electrical erosion mashine with wire electrode. KEYWORDS: Electrical erosion_1, wire electrode_2, automation_3 1. INTRODUCTION With the developments in Computer Numerical Control (CNC), the versatility of Electrical Discharging Machining (EDM) has reached tremendous heights and has become an indispensable process in modern manufacturing industry because of its ability to produce complex shapes with high degree of accuracy in difficult-to-cut materials. Wire EDM machines always operate with extremely small electrode contact area. Because of this small electrode contact area the average current that may be applied to the Wire is small in comparison. 2. ELEMENTS ABOUT ELECTRICAL DISCHARGE MACHINING (EDM) Electrical Discharge Machining (EDM) is one of the most accurate manufacturing processes available for creating complex or simple shapes and geometries within parts and assemblies. Wire EDM started from scratch in the early-70’s and has made steady progress, with the most rapid process improvements occurring from the mid-80’s to the mid-90’s. In Wire Electrical Discharge Machining the electrode is a simple wire, typically .006" to .012" diameter, which follows a horizontal path through the workpiece, the wire and workpiece are submerged in an insulating liquid (dielectric fluid - deionized water). The process of stripping off material using a successive series of electrical discharges at short intervals. These discharges jump between two poles (electrode - or working tool - and piece to be machined). - These use like tools the concentrated energies, - The mobile of apparition – army industry, - In general, what is new is un-conventional. The Wire EDM today offers 4- or 5- axis (X, Y, U, V & Z) positioning capability in order to perform complex taper or three- dimensional machining. This 4-5 axis is designed for high precision cutting with fast cutting speeds and has a fixed clamping system so that the weight of the workpiece rests directly on the frame, which results in the guidance system being subjected to only light mechanical forces In plan it is possible to draw complex geometrics. For describes the wire trajectory, in plan, we must decompose in simple geometric forms (line, circle) and command two motors for move the wire. For motors we use two steppers motors and for command we use a PCB who it’s based on L297D and L298 circuits. A stepper motor is a special kind of motor that moves in individual steps which are usually 0.9 degrees each. Each step is controlled by energizing one or more of the coils inside the motor which then interacts with the permanent magnets attached to the shaft. Turning these coils on and off in sequence will cause the motor to rotate forward or reverse. The time delay between each step determines the motor's speed. Steppers can be moved to any desired position reliably by sending them the proper number of step pulses. Unlike servo motors, Nonconventional Technologies Review – no. 1/2009 79