1. ABRASIVES and ABRASIVE CUTTING
M122 Abrasive Machining
ABRASIVES and ABRASIVE CUTTING

2. Abrasives
Abrasives perform the same function as the teeth of a saw.

3. Main Abrasives Categories
Natural Abrasives
Emory
Conventional Abrasives
Aluminum Oxide, Silicon Carbide
Super Abrasives
Cubic Boron Nitride (CBN), Diamonds

4. Aluminum Oxide Most commonly used grinding abrasive
Classified as a conventional abrasive
Used on all ferrous materials except cast iron
Bauxite ore is the main ingredient

5. Silicon Carbide Classified as a conventional abrasive
Good for high density materials
Carbides, stone, ceramics, cast iron
Harder & tougher than Aluminum Oxide
Varies in color:
Green is used mainly for grinding cemented carbides and other hard materials
Black is used for grinding cast iron, ceramics, and soft nonferrous metals

6. Cubic Boron Nitride (CBN)
Twice as hard as aluminum oxide
Can withstand high temperatures
Very little dressing is required

7. Diamonds Manufactured Diamonds
General Electric 1954
Used Primarily for grinding Tungsten Carbide
Breaks down quickly when grinding steel

8. Review Q’s What is the most commonly used abrasive matl.?
Name the 3 major abrasive categories.
Name one natural abrasive.
Silicon Carbide wheels can be identified by what two colors?
Silicon carbide is used to grind what materials?
Diamond wheels are used for grinding what materials?

9. Any Questions?