CUTTER FOR OXYGEN CUTTING OF METALS Russian patent published in 2007 - IPC B23K7/06 F23D14/42 

FIELD: metal cutting, namely apparatuses for oxygen cutting of steel and titanium.

SUBSTANCE: cutter for oxygen cutting includes body, unions for supplying fuel gas, cutting oxygen and heating up oxygen; supplying and removing cooling water; mouthpiece with cone mounting surface. Body includes hollow stem, upper and lower heads fluid-tightly joined with said stem. Unions for feeding fuel gas, cutting and heating up oxygen, supplying and removing cooling Water are mounted in upper head. In lower head there are truncated cone opening on lateral surface of which two annular grooves communicated through ducts and tubes with unions for feeding heating up oxygen and fuel gas are formed and also annular groove for cooling water communicated with respective unions is formed. Mouthpiece is fluid-tightly pressed into truncated cone opening of lower head connected along central lengthwise axis with union for feeding cutting oxygen. On cone mounting surface of mouthpiece there are annular grooves abutted to grooves of lower head for restricting closed annular cavities for heating up oxygen, fuel gas and water. In mouthpiece around cutting oxygen duct along circle with diameter D1 main ducts for supplying heating mixture are formed; said main ducts are concentric and parallel to cutter axis. Additional ducts arranged along circle with diameter D2 and inclined by angle α = 2 - 4°relative to cutting oxygen duct are also formed in mouthpiece. Outlet openings of said ducts are arranged on end of mouthpiece. Dead radial slits connected with main ducts for heating mixture and having at outlet of annular groove local calibrated restriction are formed in walls of annular grooves of mouthpiece. Number of additional grooves for heating mixture exceeds by two times number of main grooves.

EFFECT: possibility for increasing cutting speed at providing desired quality of cut edges, increased useful life period of mouthpiece.

4 dwg