Mechanical Engineering - Production Engineering - Discussion

Answer incorrect.

Crater wear occurs only ductile material.

Flank wear:

It is due to work hardening. Flank wear occurs at the tool flanks, where it contacts with the finished surface, as a result of abrasion and adhesion wear. The cutting force increases with flank wear. It affects the great extent of mechanics of cutting. The flank wear region is known as wear land and is measured by the width of wear land. If the width of wear land exceeds 0.5-0.6mm the excessive cutting forces cause tool failure.

Crater wear:

Crater wear happens on the tool face at a short distance from cutting edge by the action of chip flow over the face at very high temperature. The crater wear is mainly due to diffusion and abrasion. They are commonly observed where the continuous chip is formed (usually in the ductile material). In the brittle material, the chip formation in the shape of a small segment, this loosely fragmented chip has low abrasive action on the face as compared to the continuous chip formation. The depth of crater measures the crater wear; the surface measuring instrument can measure it. The cutting edge may break from tool due to excessive cratering.

Actually, all are correct, but in question mentioned usually, so crater wears usually found in the ductile material. Therefore, the given answer is correct.

Crater wear occurs in ductile materials due to the formation of continuous chips.

Crater wear happens on the tool face at a short distance from cutting edge by the action of chip flow over the face at very high temperature. The crater wear is mainly due to diffusion and abrasion.

They are commonly observed where the continuous chip is formed (usually in the ductile material).

In the brittle material, the chip formation in the shape of a small segment, this loosely fragmented chip has low abrasive action on the face as compared to the continuous chip formation. So ductile is more prominent for crater as compared to brittle.

Crater wear can also be found while machining brittle materials.

In crater wear contact with chips erodes the rake face. This is somewhat normal for tool wear, and does not seriously degrade the use of a tool until it becomes serious enough to cause a cutting edge failure and found while machining ductile material thus answer is incorrect.

Hello friends,

Answer is wrong. Crater wear is also found while machining brittle materials. And it occurs mainly due to diffusion of metals.

Crater wear is usually found while machining of diffusion materials.

Crater wear can be possible in ductile material because of chip impact on tool.