Patent ID: 6649866
Filing Date: 2003-11-18
Classification: B23K

Abstract:
A tool head for machining of materials by laser comprising:focusing optics directing a laser beam bundle generated by a laser to a workpiece surface to be machined; a gas-conducting nozzle which coaxially surrounds the laser beam bundle with the optical axis and which has an outlet opening that is arranged coaxially around the axis; wherein a free jet exits from this outlet opening; and a suction device; said nozzle being coaxially enclosed by a pipe whose inner diameter is greater than the outer diameter of the nozzle in every plane radial to the axis and a first end of the pipe being connected in a gastight manner to the outer surface of the nozzle; said pipe having an inlet opening, through which a gas is introduced into intermediate space formed between the outer surface of the nozzle and the inner surface of the pipe; a second end of the pipe being limited to an annular outlet opening by the outer surface of the nozzle; and said annular outlet opening being arranged behind the outlet opening in the radiating direction of the laser beam bundle, so that the gas flows in axial direction around the exposed outer surface of the nozzle until the outlet opening and subsequently flows to the workpiece surface so as to enclose the free jet exiting from the nozzle.