JPS6418588A - Cutting device - Google Patents

Abstract

PURPOSE:To easily and accurately cut a slender pipe, etc., by delivering, stopping and holding a material to be cut and projecting a laser beam on the outside periphery of a cutting part of the material to be cut with the turning of a body of rotation. CONSTITUTION:The material 6 to be cut is led to a guide body 14 through a couple of rollers 13 of a feed mechanism 11 and delivered by for the prescribed length by rotations of the couple of rollers 13 and afterward, stopped and held thereby and the central position in the vicinity of the cutting part is held accurately by the guide body 14. Then, the body 18 of rotation is rotated at the prescribed speed and a laser beam light source 24 is driven and a laser beam 32 is projected on the cutting part of the material 6 to be cut from an aperture hole 30 via a fixed optical system 23 and a rotational optical system 26. By this method, the laser beam 32 is projected on the outside periphery of the cutting part of the material 6 to be cut in accordance with the turning of the body 18 of rotation and the material 6 to be cut is cut from the outside periphery to the inside periphery. At this time, since the material 6 to be cut is cut from the outside periphery by the laser beam 32, burrs at a section are hardly produced.