CUTTING METHOD BY HIGH PRESSURE FLUID JET AND CUTTING DEVICE THEREFOR

PURPOSE:To prevent the damage of a workpiece caused by falling after being bored and support cut material stably at the cutting time so as to improve cutting accuracy. CONSTITUTION:Cutting line groups 32a, 32b and cutting line groups 35a, 35b are divided in every common direction on the cutting lines of a workpiece. Cutting positions are disposed in different positions on a cutting table 2 every cutting line group, and opening parts 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b opened in correspondence with areas surrounding the respective cutting lines are formed at the cutting table 2 in the respective cutting positions. Cut material is positioned so that the cutting lines corresponding to the respective cutting line groups coincide with the opening parts, and cut by high pressure fluid jet while moving a nozzle along the cutting line of the workpiece.