Introduction to Wire EDM

Wire EDM It is an electrical discharge wire‑cutting process that uses a continuously moving metallic molybdenum wire to generate sustained pulsed spark discharges between the wire and the workpiece, thereby achieving material removal and shaping. The electrode wire shares the characteristics of multiple‑pass cutting with those of slow‑wire EDM, and can also be regarded as a fast‑wire EDM system capable of repeated use.

The quality of medium‑speed wire EDM falls between that of the other two types of electrical discharge machining, yet its cutting speed exceeds that of the high‑speed type. With advances in technology and improved control systems, its performance has now approached that of the slow‑feed wire EDM, making it one of the most widely used EDM machines today.

The principle of wire EDM is as follows: The distance between the electrode wire and the workpiece is adjusted by the machine tool’s feed‑servo system to maintain an appropriate discharge gap. When the applied pulse voltage reaches the breakdown voltage of the dielectric fluid in this gap, a discharge occurs, raising the temperature in the localized micro‑region to tens of thousands of degrees Celsius. This causes the metal at that location to melt or even vaporize, and under the force of the resulting explosion, the molten material is ejected into the dielectric fluid, which carries it away from the discharge zone. As a result, a tiny pit forms on the workpiece surface. By repeating this process, the electrode’s shape is gradually etched into the part’s surface.

Wire EDM By adopting advanced concepts and technologies for precision mold machining from both domestic and international sources, we have integrated the slow‑feed, multi‑pass cutting philosophy and techniques into the control hardware and software of existing machine tools. While retaining the low cost and excellent process performance of fast‑feed machines, this approach has significantly addressed their shortcomings—namely, poor precision and subpar quality—bringing product accuracy close to that of dedicated slow‑feed systems. At the same time, the capital investment and operating costs of these machines have been substantially reduced, sparking a revolution across the entire mold‑making industry and truly delivering fast‑feed pricing with slow‑feed quality.

Wire EDM The wire electrical discharge machining (WEDM) process operates at a moderate cutting speed, achieved through a composite wire‑feeding strategy. The wire‑feeding principle combines high speed during rough cutting with low speed during finish cutting; this two‑pass approach minimizes errors caused by workpiece deformation and wire wear, thereby significantly enhancing part quality and producing a smooth, streak‑free cut surface.

Based on the principle of wire electrical discharge machining, it can be concluded that the first pass, which is a high-speed rough cut, calls for a peak current with a correspondingly wider pulse width, employing a high‑current cutting strategy to achieve higher cutting speeds. The second, finishing pass prioritizes dimensional accuracy; a medium current and narrow pulse width are recommended to keep the surface roughness within the range of 1.4–1.7 μm.

During machining, workpieces undergo irregular deformation due to residual internal stresses and thermal stresses, which can compromise subsequent quality and dimensional accuracy. Therefore, these factors must be accounted for when determining the machining allowance to ensure the part’s dimensions are precise.

Dongguan Fulin Machine Co., Ltd. specializes in Wire EDM High-precision grinding, wire EDM, mechanical components, multi-axis machining, CNC machining, five-axis machining, precision parts, custom‑made parts, and general machining—our company boasts state-of-the-art production equipment and a comprehensive suite of advanced inspection tools, including coordinate measuring machines, microscopes, projectors, hardness testers, 3D scanners, and Swiss height gauges, ensuring the manufacture of high‑precision products that meet our customers’ exacting standards. To date, we have maintained successful long‑term partnerships with numerous industry leaders, earning consistent recognition and acclaim for our product quality. Our enduring commitment is to put people first, prioritize quality, foster unity and drive forward, and continuously innovate—all in pursuit of customer satisfaction. We win through superior quality, honor timely delivery commitments, delight customers with exceptional service, and safeguard their interests with systematic management.