Abstract
Some machine parts, such as cutting tools and shearing blades, have importance in their corner shapes. The corner dullness which deteriorates the corner shapes is often generated at the ends of ground machine parts. This paper deals, both theoretically and experimentally, the mechanism of generating the dullness under one-pass-plunge grinding and following results are obtained. (1) Entrance dullness, being generated at the wheel entrance part, and exit dullness, being generated at the wheel exit part, are different in shape. The height of exit dullness is about three times as much as the entrance. (2) Shapes of the dullness, theoret-ically obtained under consideration of the wheel-workpiece relative displacement and utilizing the one-freedom vibration model, show good agreement with measured results. (3) Height of the exit dullness increases with wheel depth of cut, table speed, and grinding stiffness under usual grinding condition. (4) Height of exit dullness decreases with equivalent mass, dumping coefficient, and spring constant of the grinding machine.
