Deform 2D Cutting force problem....

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A simple but confusing problem... 

i had design a machining models, i
have change from 4000 rpm to 40000 rpm, using SFTC DEFORM 2D... 

I setWC as cutting tool and AISI1045
machining...

i wish to get the cutting force data... i check for load stroke
graph...

and put time (s) at X axis, and X Loads (N) for Y axis...

Do this results show
cutting force?

I have check the load stroke result from 4000 rpm to 40000 rpm, its show almost the same X load for 0.005 mm/rev cutting feed.. around 20N... why its happen? 

wish someone kindly help me... 

Regards,

Shahir