| 摘要 |
<p>A circular saw capable of being provided with a base metal which can cut even in a rotating zone of min. critical rotation speed or higher, being used in a high-rotation-speed zone even if the base metal is thin, reducing a saw thickness by an amount equal to the reduced amount of the base metal, setting a high feed rate because a cutting force per tooth can be reduced by that amount, and thus increasing a work machining efficiency and an operating efficiency, characterized in that it can be used in a zone of min. critical rotation speed or higher at the time of cutting of a work and, in two modes where the node circular number of the base metal of the circle saw (m) is 0 and the same node diameter number is (n), a relative difference in natural frequency between the circular saw natural frequency and a natural frequency difference Δfn/fn1 is 3.0 % or more for the node diameter number n = 3 and 3.5 % or more for the node diameter number n = 4, where the natural frequencies of the circular saw are fn1 (Hz) and fn2 (Hz) (where fn2 ⊃ fn1) and the natural frequency difference Δfn = fn2-fn1.</p> |
