Tool wear (Chapter 2)

Posted by BMFRGuru at 7:17 AM

Effects of Tool Wear

Some General effects of tool wear include:

increased cutting forces
increased cutting temperatures
poor surface finish
decreased accuracy of finished part

Reduction in tool wear can be accomplished by using lubricants and coolants while machining. These reduce friction and temperature, thus reducing the tool wear.

Tool Life Expectancy

The Taylor Equation for Tool Life Expectancy provides a good approximation.

V c T n = C

A more general form of the equation is

$V_c T^n \times D^x f^y=C$

where

$V c$ =cutting speed
T=tool life
D=depth of cut
F=feed rate
x and y are determined experimentally
n and C are constants found by experimentation or published data; they are properties of tool material, workpiece and feed rate.