Patent ID: 8876442
Filing Date: 2014-11-04
Classification: B23B,B23Q,Y10T

Abstract:
1. A rotary cutter, comprising: a chuck that grips and holds a rotary cutting tool, and is fastened to a main rotating shaft; and a cover having a cylindrical section that covers and comes in close contact around the circumference of part of an outer peripheral surface of said chuck such that sliding movement is possible, and is supported such that rotation is not possible; wherein said cover has a first supply path; said chuck has a second supply path and a hollow center cavity; said rotary cutting tool has a third supply path that is formed such that openings on a rear end surface and a tip end section are connected; a fluid-air mixture of cutting fluid and air is fed in order through said first supply path, said second supply path, said hollow center cavity and said third supply path to the tip end section, and said fluid-air mixture of cutting fluid is sprayed in mist form from the tip end section of said rotary cutting tool; a throttle is formed at a position on the axis of rotation inside said hollow center cavity such that said throttle divides said hollow center cavity into a front throttle chamber that is connected to said second supply path and a rear throttle chamber that is connected to said third supply path; said second supply path is oriented such that said fluid-air mixture is sprayed toward said throttle; said throttle is configured to return said fluid-air-mixture that is sprayed out from said second supply path to mist form; and said fluid-air mixture is sprayed in mist form from the tip end section of said rotary cutting tool after passing through said rear chamber and said third supply path; wherein a supply pipe that feeds said fluid-air mixture of cutting fluid and air is connected to an outside opening of said first supply path; said first supply path is formed such that it penetrates a peripheral wall of said cylindrical section; said second supply path having two ends is formed such that one of the two ends opens up to said outer peripheral surface and an other end of the two ends opens up to said hollow center cavity; and during relative movement between said cover and said chuck, said first supply path and said second supply path are connected when at least a part of an inside opening of said first supply path faces at least a part of an outside opening of said second supply path, and are disconnected when the inside opening of said first supply path is covered by said outer peripheral surface and the outside opening of said second supply path is covered by an inner peripheral surface of said cover.