MEJSELFESTE AV STAL OCH FORFARANDE FOR FRAMSTELLNING AV MEJSELFESTE

MEJSELFESTE AV STAL OCH FORFARANDE FOR FRAMSTELLNING AV MEJSELFESTE

A bit holder consisting of steel, said bit holder comprising a bore for accommodating the bit shaft and being welded to the cutting head of a cutting machine, characterized in that the bit holder consists of a part of heat-resistant steel of high strength and of a foot consisting of an unalloyed or...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: O SCHETINA, H WRULICH
Format: Patent
Sprache:swe
Schlagworte:
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
MINING OR QUARRYING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:A bit holder consisting of steel, said bit holder comprising a bore for accommodating the bit shaft and being welded to the cutting head of a cutting machine, characterized in that the bit holder consists of a part of heat-resistant steel of high strength and of a foot consisting of an unalloyed or low alloy steel of good weldability and being welded to said foot over the whole contacting area. In making the holder a blank corresponding to the part accommodating the bit shaft is over the whole contacting area welded to a blank corresponding to the foot to provide a composite blank which is subsequently forged in a forging die.