Wire EDM Finishing Processes / /
Wire EDM can produce a smooth, mirror-like finish, but some finishing may still be required to customize a part. Some of the common finishing processes used for wire EDM parts include:
Painting adds color, varnish, or ink to a part. Painting may include powder coating, liquid coating, or e-coating. During powder coating an electrostatically charged powder is used, which leaves a scratch-resistant and uniform coat on the metal part. Liquid coating applies wet paint to the surface of a part. When a part is e-coated, it is dipped into a bath of paint where it and the paint are electrified, resulting in the paint adhering to the part.
Transferring adds a label or design to a part. Pressure is applied to the part using a heated press, which transfers the design to the part. Transferring can also be used to print a design that will later be engraved onto the part.
Assembly is needed when a small part must be joined together with other parts to form a larger piece. During the assembly process, the workpiece is bonded together using fasteners or bonding procedures.
Drilling adds a round hole to a part. A drill press, tapping, or milling machine may be used to create a hole. Other kinds of drills may be used including spotting or peck drills.
Deburring removes raised edges or unwanted material known as burrs. Electrochemical, thermal or abrasive flow deburring may be used. Electrochemical deburring uses an anodic metal dissolution to remove unwanted material. Thermal deburring uses a combustible gas in a pressurized chamber to deburr a part. Abrasive flow deburring uses an abrasive slurry to deburr the part.