In ultrasonic machining (USM), the tool is made of a ductile and tough metal, not a hard and brittle one.

Quick Scoop

  • The tool in USM is usually softer than the workpiece and must be ductile and tough so it can withstand repeated ultrasonic impacts without cracking.
  • Common tool materials used in USM include:
    • Mild/low‑carbon steel and soft steel
* Stainless steel

* Monel, molybdenum, and similar tough alloys in some setups
  • The actual cutting is done by abrasive particles in the slurry (like boron carbide, silicon carbide, aluminum oxide), which are much harder than both tool and workpiece.

Why these materials?

  • The tool must transmit high‑frequency vibrations efficiently while resisting fatigue, so toughness and ductility are more important than extreme hardness.
  • If the tool were hard and brittle, it would crack or chip under the cyclic load of ultrasonic vibrations and abrasive impacts.
  • Steels (mild, low‑carbon, stainless) provide a good balance of strength, toughness, machinability, and cost, which is why they are most widely used.

So, when someone asks “what type of tool material is used in USM?”, the concise answer is:
A ductile and tough metal, typically mild/low‑carbon steel or stainless steel, chosen to be softer than the hard, brittle workpiece so the abrasives can do the cutting.

Meta description (SEO style) :
In ultrasonic machining (USM), the tool is made of ductile and tough metals such as mild steel and stainless steel, softer than the hard workpiece, while hard abrasives perform the actual material removal.