Page 143 - Module DMV20173

7.0 NON CONVENTIONAL PROCESSES

7.6 ULTRASONIC MACHINING

1. Ultrasonic machining, also known as ultrasonic impact grinding, is the use of
ultrasonically-induced vibrations delivered to a tool.
2. When combined with an abrasive slurry, ultrasonic machining allows the tool to

create accurate cavities of virtually any shape in hard, brittle materials.
3. This machining process is nonthermal, nonchemical, and nonelectrical. It does not
change the metallurgical, chemical or physical properties of the workpiece.

4. The cutting vibration uses in the ultrasonic machining process begins with converting
a high-frequency electrical signal into an oscillatory mechanical motion.
5. This motion is acoustically transmitted through a metal tool holder and cutting tool
assembly.
6. This linear oscillation is typically at a rate of 20,000 times per second, and, when

used with an abrasive slurry flowing around the cutting tool, microscopic grinding
occurs.
7. The machined area becomes counterpart of the cutting tool used.
8. Using this technology, we can cut almost limitless assortment of types and shapes of

cuts to meet any design requirements.

( a ) ( b )
Figure 7.7 (a) Equipment (b) Schematic diagram.

BPLK 175 DMV 20173