Chap 27 Flashcards
Process also known as etching, this is a general term for the removal of material from a part when it is immersed in a corrosive fluid: selective attack by the fluid on different areas of the workpieces surface is controlled by adding and removing layers of materials called masking: it is the oldest of the advanced machining processes and is used for engraving metals, and in the production circuit boards and microelectronic devices
chemical machining
General term for the removal of materials from a workpiece by the actions of an electrical power source and ion transfer inside an electrolytic fluid; it is essentially the opposite of electroplating; metal ions are washed away from the surface of a workpiece(the anode) via a pump that circulates electrolyte fluid fast enough so the metal ions do not have the chance to plate themselves onto the tool(the cathode); the tool is the same shape of the cavity that is produced in the workpiece; it is generally used to machine complex cavities and shapes in high-strength materials and does not leave burrs
electromechanical machining
General term for the removal of material by melting small portions of a workpiece by a spark; also called spark erosion machining; in the most common version, the (usually metal) workpiece and a tool in the shape of the cavity to be formed are both immersed in a dielectric fluid and connected to a DC power supply; when the potential between the workpiece and tool is sufficiently high, the dielectric breaks down and a short-lived spark discharges through the fluid, removing a very small amount from the workpiece surface
electrical discharge machining
Use of ionized gas cut metal sheets and plates; it is much faster than electrical discharge machining and laser beam machining
plasma arc cutting
The focusing of a jet of water on a workpiece in order to cut it; the water jet acts like a saw and cuts a narrow groove in the material; no heat is produced and it is environmentally friendly
abrasive water jet machining
