With regard to the rate at which a cutting tool gradually we

With regard to the rate at which a cutting tool gradually wears, which one of the following statements is true? An increase in cutting speed normally increases the rate of gradual tool wear due to increased heat generation in the cut zone which leads to increased thermal expansion of the work piece and cutting tool, which leads to greater contact stress An increase in cutting speed normally increases the rate of gradual tool wear due to increased heat generation in the cut zone which leads to increased thermal softening of the cutting tool, making it more susceptible to scouring by hard inclusions in the work piece An increase in cutting speed normally decreases the rate of gradual tool wear due to decreased heat generation in the cut zone which leads to increased thermal hardening of the cutting tool, making it less susceptible to scouring by hard inclusions in the work piece An increase in cutting speed normally decreases the rate of gradual tool wear due to increased air convection around the cut zone which decreases thermal softening of the cutting tool, making it less susceptible to scouring by hard inclusions in the work piece None of the above

Solution

Option a is true