METHOD FOR FABRICATING HELICAL GEARS FROM PRE-HARDENED FLAT STEEL STOCK

An improved method of cutting a helical gear sector onto a pivoting arm of a casement window is disclosed. The method includes beginning with a pre- hardened flat sheet of'steel stock and cutting the arm and the helical gear sector of'the aim in two steps The non-toothed portions of't...

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Bibliographische Detailangaben
Hauptverfasser:	BOURGOIN, BRIAN DAVID, OSTBY, ERIK JAN, TOOKER, CRAIG CHARLES, BRIGGS, JEFFREY MARK
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHECKS FOR WINGS CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION FIXED CONSTRUCTIONS KEYS LOCKS MACHINE TOOLS MAKING GEARS OR TOOTHED RACKS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS SAFES SOLDERING OR UNSOLDERING TRANSPORTING WELDING WINDOW OR DOOR FITTINGS WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THEFUNCTIONING OF THE WING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	An improved method of cutting a helical gear sector onto a pivoting arm of a casement window is disclosed. The method includes beginning with a pre- hardened flat sheet of'steel stock and cutting the arm and the helical gear sector of'the aim in two steps The non-toothed portions of'the aim are cut with a laser and nitrogen assist or shielding gas to prevent any oxidation to the non-toothed portions of'the structure. T he helical gear sector is also cut with a laser, but using oxygen assist gas Use of the oxyg en prevents recast slag from accumulating in the gear sector. Thus, a finished part is completed with two laser cutting operations thereby eliminating the need for separate stamping, shaping, deburring and subsequent heat treatment processes used in conventional manufacturing methods The subsequent heat treating is eliminated because a pre-hardened steel stock may be utilized,.