Abstract
This paper deals with the grinding characteristics of newly developed polycrystalline CBN (CBN-U) abrasives in creep feed profile grinding of nickel-based superalloys. Experiments for producing a V-shaped groove on a flat surface in one pass by creep feed grinding have been carried out using the new polycrystalline CBN-U and representative conventional CBN (CBN-B1) grits. When grinding with CBN-U abrasives, both radial wear and profile wear are less, and hence the grinding ratio is around 10 times higher than with the conventional CBN-B1 abrasives. Grinding forces in grinding with CBN-U are reduced by 20〜30% compared with CBN-B1. The CBN-U abrasive is suitable for the applications with a high dimensional accuracy in creep feed profile grinding for nickel-based superalloys, because it gives less profile wear, and hence better form retention, than conventional CBN abrasive.
