JPS56144890A - Punching work by laser - Google Patents

Abstract

PURPOSE:To prevent the material to be worked from being retained in the hole in the molten state, by exploding the liquid with a low boiling point covering the part to be worked when the working is performed with solid laser beams, with gas laser beams. CONSTITUTION:Low boiling point liquid 8, such as water, oil, etc., is poured through nozzle 7 installed at the part to be worked, and solid laser beam 1 is irradiated. Since beam 1 has a high liquid 8 transmittivity due to its short wavelength, it reaches working object 3 and proceeds with the punching work by heating, melting and evaporating the working object. On the other hand, gas laser beam 11 is also irradiated onto the part to be worked at the same time or a little later. Since beam 11 has a high liquid 8 absorption factor due to its long wavelength, it does not reach the part to be worked, and is absorbed into the reservoir of liquid 8. Therefore, when high output beam 11 is irradiated like a pulse, the reservoir of liquid 8 is instantaneously boiled and an explosion phenomenon is produced. The blowing action of molten material of working object 3' is synchronized to this explosion, and thus the stoppage of molten material 3' is prevented.