Cutting nozzle for flame-cutting with oxygen under an elevated oxygen pressure

摘要

A cutting nozzle (10) has a cutting-oxygen channel (11) which, in the outflow direction (12) of the cutting-oxygen, widens conically from a throat (13) to an outlet (14). To achieve a further increase in the cutting speed and a higher cutting quality the throat diameter dg should be calculated in accordance with the following equation: IMAGE where G (constant)=0.55 at S=5 to 25 mm 0.48 at S=3 to 100 mm, S=thickness of the workpiece in mm and P=oxygen pressure in bars, upstream of the narrowest cross- section, to that the outlet diameter dA is calculated in accordance with the equation: IMAGE A being a constant within the range from at least 1.09 and at most 1.23 and FG DIVIDED FK being the widening ratio in Lavel nozzles, with k=1 .4. IMAGE