What effect of the cutting tool causes burr formation?POSSIBLE ANSWERS:FatigueElastic deformationPlastic deformationFracture

Analyzing Burr Formation

Burr formation during machining processes is mainly influenced by the physical effects resulting from the interaction between the cutting tool and the workpiece material.

1. Fatigue: This generally refers to the weakening of material caused by repeated loading and unloading, and it is not primarily responsible for burr formation.

2. Elastic Deformation: This is a temporary change in shape or size of the material under stress, returning to its original form once the stress is removed. This doesn’t lead to burrs either.

3. Plastic Deformation: This occurs when the material is subjected to stress greater than its yield strength, causing permanent change in shape. When a cutting tool exerts excessive force, the edges may deform plastically, resulting in the formation of burrs.

4. Fracture: This refers to the breaking of material into pieces. While it may contribute to surface irregularities, it is not a direct cause of burr formation compared to plastic deformation.

Final Answer

The primary effect of the cutting tool that causes burr formation is Plastic deformation.