Abstract
Grinding debris have been studied using optical and scanning electron microscopy, x-ray fluorescence, and primary back-scatter electron methods. Dry grinding with vitreous bonded alumina wheels on steels produces almost entirely colorless particles broken from the wheel. With base oil as coolant, these particles are again formed but with a variegated, polymeric-colored film on the work-piece. With a soluble oil emulsion containing sulfurated and chlorinated additives, many colored and fibrous particles are found which contain sulfur and chlorine. The grinding contact zone is considered as a reactor in which many chemical processes can be initiated and maintained, and the production of the polymeric films and the colored and fibrous products are, respectively, interpreted in terms of chain polymerization reactions initiated at the fresh surfaces formed during grinding and of the high “vibration-equivalent temperatures” generated in the wheel and the workpiece during the scraping contact, which permit diffu...
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