Wire EDM Finishing Processes / /
Some finishing may be required on wire EDM parts even though the process can produce a smooth, mirror-like finish. Common finishing processes for wire EDM parts include:
Painting adds color, varnish, or ink to a part. There are three methods of painting which include powder coating, liquid coating, or e-coating. During powder coating, the powder is electrostatically charged which leaves a scratch-resistant and uniform coat on the metal part. Wet paint is used during liquid coating and is applied to the surface of the part. E-coating is the process of dipping a metal part into a bath of paint. The part and paint are electrified and the paint adheres to the part.
Transfers add a design or label to a workpiece. To add the design to the part, a heated press is used to apply pressure and transfer the design. Transferring may also be used to add a design to a part that will later by engraved.
Assembly is required when the unit manufactured is part of a larger piece. The part may be bonded temporarily or permanently to other parts using fasteners or bonding procedures.
Drilling adds a round hole to a part. A drill press, tapping, or milling machine may be used to add a hole. Spotting or peck drills may also be used, depending on the kind of mark that needs to be made.
Deburring removes any raised edges or unwanted material known as burrs. Electrochemical, thermal, or abrasive flow deburring may be used. During electrochemical deburring an anodic metal dissolution may be used 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.