Abstract
The fly milling tests were performed on several abrasive grains for application to heavy grinding by means of a lathe at a speed of 1800m/min. In each case the workpiece plate (S 45 C steel) was inclined 1 mm in 1500mm. The abrasive grains tested are regular 2 A, microcrystalline, roasted 2A, roasted microcrystalline, and sintered grains. The length of scratch was measured using optical projector and the maximum depth of scratches obtained. From these measurements chipping fracture probability, chipping height, etc., were determined and discussed depending on the physical characteristics of each grains. The sintered grains have exceptionally high resistances to chipping fracture. The roasted 2A or roasted microcrystalline grain was seen to fracture less frequently than the 2A or microcrystalline grain. The microcrystalline and the roasted microcrystalline grains indicated less chipping height than the other two grains. As a result, the sintered grain is the most desirable from the viewpoint of chipping fracture, followed by the roasted 2 A or the roasted microcrystalline, the microcrystalline, and 2A.
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