Abrasion machining using bonded abrasives provides rapid material removal and high dimensional accuracy. However, to enhance abrasion machining in surface finishing, it is essential to use it in combination with a secondary erosion process, such as interfacial reaction machining that yields good surface finish and low subsurface damage. A new vitrified-bonded superabrasive stone has been developed to realize such a combined machining process, namely mechanochemical superfinishing [1]. This stone contains cBN grit and the abrasive cerium oxide, CeO_2, which is softer than the bearing steels but reacts chemically with them. Using this stone, it was possible to obtain a smooth surface with negative skewness, which could not be produced using a conventional cBN stone. A mechanochemical diamond stone that contains the abrasive barium sulfate, BaSO_4, has recently been developed. In this paper, the chemical reaction that occurs between BaSO_4 and the Fe being machined is investigated theoretically and experimentally, and the performance of diamond stone containing soft and reactive BaSO_4 abrasive is evaluated through superfinishing experiments.
展开▼
