Abstract
It is very difficult to obtain high accurate surface by a helical end mill even if finishing condition is selected. The reason is that there is the eccentricity of the axis of the cutter center from the axis of machine spindle. But the surface generation mechanism of by end mills eccentrically attached to the main spindle has not been analyzed. This paper therefore tries to analyze the position of helical edge in the state of eccentricity, and aims at presenting the influence of helix angle and number of teeth on working accuracy. The main results are as follows : (1) The eccentric model for analysis of edge position of the helical end mill that attached on the machine spindle with eccentric condition is proposed, and the calculating method of the envelope surface by helical edge is shown. (2) The four eccentric parameters of the end mill are calculated by using displacements of two rings mounted on the end mill, and the envelope surface is calculated based on the above parameters. (3) It is shown that the shape of machined surface by finishing is almost coincident to that of the envelope surface. (4) The simulation analysis of the envelope surface by helical edge is performed, and it is shown that the influence of helix angle and number of teeth on the shape of envelope surface and the dimensional and shape errors.
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