Normally, in milling processes concordance is better than opposition. Why in frontal milling with ceramic inserts the performance of inserts is better in opposition than in concordance?
It should be to limit shock and notching hazard of the insert ( progressive chip thickness).
Here is an extract of sandvik coromant website where you could find further information.
http://www.sandvik.coromant.com/en-us/knowledge/milling/getting_started/milling_different_materials/hrsa_and_titanium_milling/pages/ceramic-inserts-cutter-for-roughing-hrsa.aspx
Thinking about force alter its direction. Shear and plounig along ship formation.
up-cut:: starts with h=0, ends with h=max
down-cut: starts with h=max, ends with h=0
Carbide inserts do not like any tensile stresses at all, which can appear by ending with h=max due to adhesion. This is the same for ceramic tools. But ceramic cutters do not have such a high schock-resistant compared to carbide cutters. Schock occurs by starting with h=max. Therefore up-cut strategy is more applicable. Up-cut strategy also reduced the vibrations during the process. That's why sawing (which is kinematically the same as milling) is often applied as up-milling.
- Badges
- Science topic
- Similar topics
- Automotive Engineering
- Machines