Tool life Taylor extended Equation

[mitxael]

hi, im a mechanical engineer.
I am going to study a finish bohring operation using a single insert toolholder. The initial conditions are:

depht of cut=0,3 mm (mean diameter 26 mm)
cutting speed=160m/min
feed=240mm/min

Part: Rod made of sintered steel. HRC 30 core and surface.
Insert: Kennametal CCMT 060208 LF KT315 (cermet coated)

Before trying, i would like to know if the Taylor extended Equation can be applied to this case.
I know that i am simplifying too much but i have read one experimental study about Taylor extended equation and would like to compare it with your knowledge.
Thanks a lot.

 

[papster]

equations don't work. only 30 years of experience would tell you that.

 

[EnglishMuffin]

Equations do work for some things - 30 years of experience have taught me that.

 

[mrainey]

Well, I've only got 25 years - but I doubt that an equation would be of much benefit in this case.

I imagine they did help in getting us to the moon and building Hoover Dam.

 

[Viktor]

mitxael (Mechanical)

It all depends on the objective and the desired accuracy of your study. The Taylor equation is a very rough approximation of reality. It is more suitable for low cutting speeds and for “old” tool materials. I would recommend the use of the first metal cutting law instead.

Regards


Viktor

http://viktorastakhov.tripod.com

 

[grinderguy]

My experience with sintered metals has been very painful. I have only used formulas like speed and feed. The first thing you need is time and second is money. If you can determine thermal shock is ruining the insert, or suspect thermal shock, I have increased tool life by misting the coolant rather than "flooding". The misting provides lubrication and some cooling to the part. The cutting tool can stand a lot of heat, but not a large change or gradient.

Robert Setree

http://www.advanced-grinding.com