Knowing the elements that make up the material will help determine the optimum melting point/temperature and thermal conductivity. Since EDM is a thermal process, the melting point/temperature and thermal conductivity of the work metal can create difficulties for the EDM operator. Regular and systematic cleaning of the machine also can extend the life of some consumable items. Good cleaning habits and care of a wire EDM machine is highly recommended. Long interval items vary from bi-monthly to yearly. Short interval items vary in occurrence from weekly to monthly. When planning and scheduling wire EDM machine maintenance, required actions can be grouped into short interval and long interval items. But the importance and type of basic items that need to be maintained on all wire EDMs are very similar. There are several wire EDM machine tool manufacturers, and there are some significant differences in the machine design of each. This level of maintenance also prevents machine failure and unexpected machine downtime. The most important reason to properly schedule and perform this routine wire EDM maintenance is to ensure consistent and repeatable machining results for the aforementioned machine traits of speed, accuracy and surface finish. If certain machine components are not properly cared for, machining speeds and accuracies will rapidly decay. Source: Machining 101: What is Electrical Discharge Machining?ĭue to the electro-mechanical nature of wire EDM machines, there are several items in normal operation that routinely wear and require cleaning and/or replacement. A good spark should take a large shovel out of the workpiece and a very small piece of the electrode. Each tiny spark creates heat, and the more power and the higher the frequency of the spark, the more heat is created. The EDM process, much like other metal-removal processes, presents two main difficulties that must be overcome: heat and contamination. When you consider that the speed of the EDM process may vary from 1,000 to 150,000 sparks per second, a machine that helps you choose the correct waveform, select the maximum power allowable by geometry, and automatically adjust the flush and cooling time between sparks is a pretty difficult machine to beat. To dig a hole/cavity faster, you can use a bigger shovel (more power) or shovel faster (shorter pauses between sparks) or use a different-shaped shovel (electrical waveform). Whether you are digging a hole or electrically removing material to form a cavity with an EDM, you remove material one shovel, or one spark, at a time. A good way to describe the material erosion process of an electrical discharge machine is to think of the EDM spark as a shovel. EDM stands for Electrical Discharge Machining.
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