AT129696B - Process for the production of hollow metal rods such as hollow drill steels and the like. like - Google Patents

Process for the production of hollow metal rods such as hollow drill steels and the like. like

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Publication number
AT129696B
AT129696B AT129696DA AT129696B AT 129696 B AT129696 B AT 129696B AT 129696D A AT129696D A AT 129696DA AT 129696 B AT129696 B AT 129696B
Authority
AT
Austria
Prior art keywords
hollow
production
metal rods
core
rod
Prior art date
Application number
Other languages
German (de)
Original Assignee
Svenska Kullagerfabriken Hofor
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Svenska Kullagerfabriken Hofor filed Critical Svenska Kullagerfabriken Hofor
Application granted granted Critical
Publication of AT129696B publication Critical patent/AT129696B/en

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Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Herstellung von hohlen Metallstange wie   Hohlbohrstählen   u. dgl. 



   Die Erfindung betrifft ein Verfahren zur Herstellung von hohlen Metallstange, wie Hohlbohrstählen, Stehbolzen für Dampfkessel u. dgl., aus hohlen Knüppeln oder Ingots, bei welchem der Raum zwischen der   Lochwandung   der Stange und dem in sie eingesetzten Metallkern von geringerem Durchmesser als jener des Stangenloches vor dem Strecken der Stange mit   niehtmetallischem   Füllmaterial ausgefüllt wird. Das Ausziehen des Kernes stiess nämlich wegen der sehr grossen Reibung auf Schwierigkeiten. Es ist daher schon vorgeschlagen worden, einen Metallkern von geringerem Durchmesser als jener des Hohlraumes im Werkstück zu verwenden und den so erhaltenen Zwischenraum mit Sand, Graphit oder einem andern nichtmetallischen Füllmaterial auszufüllen.

   Das Ausfüllen des Zwischenraumes zwischen Kern und Werkstück mit dem pulverigen Material ist aber umständlich und zeitraubend. 



   Die Erfindung vermeidet diesen Nachteil dadurch, dass auf den Metallkern, der in bekannter Weise von Anfang an einen geringeren Durchmesser aufweist als der Lochdurchmesser, das nichtmetallische, die Reibung verringernde   Füllmaterial inForm von Platten   bzw. in Sehnurform aufgebracht, d. h. um den Kern hüllenartig angeordnet bzw. auf denselben aufgewickelt wird. Als Füllmaterial können   z.   B. Asbestplatten   oder-schnüre   verwendet werden. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Process for the production of hollow metal rods such as hollow drill steels and the like. like



   The invention relates to a method for producing hollow metal rods, such as hollow boring steels, stud bolts for steam boilers and. Like., made of hollow billets or ingots, in which the space between the hole wall of the rod and the metal core inserted into it, which has a smaller diameter than that of the rod hole, is filled with non-metallic filler material before the rod is stretched. Because of the very high friction, pulling out the core ran into difficulties. It has therefore already been proposed to use a metal core with a smaller diameter than that of the cavity in the workpiece and to fill the gap thus obtained with sand, graphite or another non-metallic filler material.

   Filling the space between the core and the workpiece with the powdery material is laborious and time-consuming.



   The invention avoids this disadvantage in that the non-metallic, friction-reducing filler material in the form of plates or in the form of a tendon is applied to the metal core, which from the start has a smaller diameter than the hole diameter, as is known. H. is arranged around the core like a sleeve or wound onto the same. As a filling material, for. B. Asbestos sheets or cords can be used.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims (1)

PATENT-ANSPRUCH : Verfahren zur Herstellung von hohlen Metallstangen, wie Hohlbohrstählen u. dgL, bei welchen der Raum zwischen der Lochwandung der Stange und dem in sie eingesetzten Metallkern von geringerem Durchmesser als jener des Stangenloches vor dem Strecken der Stange, mit nichtmetallischem Füllmaterial ausgefüllt wird, dadurch gekennzeichnet, dass das Füllmaterial, z. B. Asbest, in der Form von Platten um den Kern hüllenartig angeordnet oder in Schnurform auf den Kern aufgewickelt wird. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Process for the production of hollow metal rods, such as hollow drill steels and the like. dgL, in which the space between the hole wall of the rod and the metal core inserted in it, of smaller diameter than that of the rod hole, is filled with non-metallic filler material before the rod is stretched, characterized in that the filler material, e.g. B. asbestos, is arranged in the form of plates around the core like a sleeve or wound in string form on the core. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT129696D 1929-06-28 1930-06-24 Process for the production of hollow metal rods such as hollow drill steels and the like. like AT129696B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE129696X 1929-06-28

Publications (1)

Publication Number Publication Date
AT129696B true AT129696B (en) 1932-09-10

Family

ID=20296605

Family Applications (1)

Application Number Title Priority Date Filing Date
AT129696D AT129696B (en) 1929-06-28 1930-06-24 Process for the production of hollow metal rods such as hollow drill steels and the like. like

Country Status (1)

Country Link
AT (1) AT129696B (en)

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