Wire EDM Finishing Processes / /
While wire EDM can produce a smooth, mirror-like finish, some finishing may be needed to customize the part. Some common finishing processes used on wire EDM parts include:
Painting is used to add color, varnish, or ink to a part. Painting methods may include powder coating, liquid coating, or e-coating. The powder is electrostatically charged during powder coating, leaving a scratch-resistant and even coat on the metal part. Liquid coating is when wet paint is applied to a surface. 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 may be used to add a label or design to a part. The design is placed onto the part, pressure is applied using a heated press, and the design is transferred. This method can also be used to print a design that will later be engraved onto the part.
Assembly is required when the unit manufactured is part of a larger piece. During the assembly step, the workpiece is bonded together with other parts to create the final product. Fasteners or bonding procedures may be used to fuse the parts temporarily or permanently.
Drilling is used to add a round hole. Drilling may be performed using a drill press, tapping, or milling machine. Different types of drills may be used, such as spotting or peck drills, depending on the mark that must be made.
Deburring is used to remove any raised edges or unwanted material known as burrs. Deburring may be achieved using several methods, including electrochemical deburring, thermal deburring, and abrasive flow deburring. 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 deburring uses an abrasive slurry to deburr the part.