| 摘要 |
<p>In the operation of cutting a metallic work material, if the rotation of an electric motor 21 is reduced by a reduction gear mechanism including a gear mechanism and transmitted to a main shaft 23 and the metallic work material is cut by a circular saw 28 attached to one end of the main shat, the moment of inertia I (kgf.m.sec<2>) of the main shaft is set to be more than Fx(D/2)/Ä1000x250x(N/60)<2>Ü while an outside diameter of said circular saw is D (mm), the number of revolution is N (rpm) and a cutting force per tooth as a component of force in tangential direction is F (kgf). By so setting, at the initial cut positions of the work material and in a region in which the number of cutting related teeth Zi is 1.0 or less at the final cut positions, the moment of inertia is high compared with a cutting torque applied to the main shaft by intermittent cutting resistance, so that the rotational variation of the main shaft is very small. Likewise, in a region in which Zi is high, reproduced chatter is suppressed. As a result, cut surface accuracy enhances and the service life of the saw prolongs. <IMAGE></p> |
