Abstract
In this paper, a new grinding technique, the thermal deformation rate control grinding, in which the thermal deformation rate of workpiece is controlled by changing the fluid flow rate at the beginning of spark-out state, is proposed in order to improve remarkably the surface roughness of workpiece. Main conclusions obtained as follows : (1) From a viewpoint of the surface roughness improvement, the most suitable fluid flow rate exists in spark-out state. For example, the surface roughness of workpiece can be improved 32 % at the point of 10 s spark-out time when the fluid flow rate is changed from 15L/min to 3L/min comparing with the constant fluid flow rate 15 L /min. (2) The surface roughness improvement'process in the thermal deformation control grinding is made clear by considering the relationship between the actual size generation rate and the surface roughness rate of workpiece. (3) An in-process measurement method by which the thermal deformation of workpiece can be estimate, is developed to make clear the surface roughness improvement process.
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