Question

The lubrication is not required when the formability of material is sufficiently large in metal forming.

(a) True

(b) False

I got this question during an internship interview.

I need to ask this question from Friction and Lubrication in Metal Forming in section Types of Die & Metal Forming Processes of Casting-Forming-Welding II

Answer 1

The correct option is (a) True

Explanation: A dry condition (no lubricant) is mainly used when the material formability is sufficiently large to form desired metal part with simple geometry. In this case, the friction is very high as no any lubricant is used during the operation, but this friction does not significantly affect the metal part quality. A dry condition is usually suitable for hot rolling forming processes.