STUDY ON FATIGUE FAILURE OF DIFFERENT DRILL BITS ON 316 STAINLESS STEEL

STUDY ON FATIGUE FAILURE OF DIFFERENT DRILL BITS ON 316 STAINLESS STEEL

Arjun PR

Research Assistant

SSIAR Bangalore

Abstract— In metal cutting industries, the fatigue failure is the most important factor that affects the manufacturing process. The quality of the drilled part is greatly influenced by the cutting conditions, tool geometry, tool material, machining process, chip formation, work piece material, tool wear, and vibration during cutting, etc. It is important to appreciate that stainless steel is a solid material and not a special coating applied to ordinary steel to give it “stainless” properties. Conventional steels and, indeed, several other metals, are often coated or "plated" with white metals such as chromium, nickel or zinc to protect their surfaces or to provide other surface characteristics. While such coatings have their own benefits and are still widely used, the danger exists that the coating can be penetrated or damaged in some way; such that it’s protective effect is undermined.

The main problem that identified is:

·        Overheating of tool and work piece lead to the breakage of the tool.

·        Time is the most constrained parameter in an industry while a machining process carrying with respect to the tool life.

·        Vibration is the one of the major factor for the tool breakage.

·        Shorter life span of tool cost high cost for manufacturing process.

The main objective of the project is to investigate the failure rate of different drill bits while drilling the 316 Stainless steel in upright drilling machine. Obtain the theoretical values of the fatigue failure rate and breakage point by using the Taguchi orthogonal array L27 method. Obtain the failure rate and the specific failure point by using the simulation software ANSYS 17.2 version.

Index Terms— drilling, fatigue, vibration, ANSYS, stainless steel