AT125156B - Process for producing collars on hollow drills. - Google Patents

Process for producing collars on hollow drills.

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Publication number
AT125156B
AT125156B AT125156DA AT125156B AT 125156 B AT125156 B AT 125156B AT 125156D A AT125156D A AT 125156DA AT 125156 B AT125156 B AT 125156B
Authority
AT
Austria
Prior art keywords
collars
hollow drills
hollow
producing
collar
Prior art date
Application number
Other languages
German (de)
Inventor
Theodor Czepl
Original Assignee
Theodor Czepl
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 Theodor Czepl filed Critical Theodor Czepl
Application granted granted Critical
Publication of AT125156B publication Critical patent/AT125156B/en

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  • Forging (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Herstellung von Bunden an Hohlbohrern. 



   Die Bunde an Hohlbohrern werden bisher durch Stauchen in warmem Zustande an der gewalzt Stange hergestellt. Die durch dieses Stauchen gegebene plötzliche Querschnittsvergrösserung führt nun zur Bildung einer Falte b (s. Fig. 1 der Zeichnung) im Innern des Loches, welche der Grund zu vorzeitigen Bohrerbrüehen ist. 



   Gemäss der Erfindung wird durch völlig anders geartete Herstellungsverfahren des Bundes die Faltenbildung und damit ein Bruch des Bohrers an dieser gefährdeten Stelle gänzlich vermieden. Der Bund wird nämlich nicht mehr, wie bisher durch Stauchung der Stange hergestellt. sondern derart, dass der   Faserverlauf   der Stange erhalten bleibt, die beim Stauchen erforderliche hohe Erhitzung und damit verbundene   Gefügeveränderung   vermieden wird und das Loch in der Stange völlig unverändert bleibt. 



   Die Durchführung des Verfahrens ist auf verschiedene Arten möglich. 



   Fig. 2 der Zeichnung veranschaulicht einen Bund von   dreieckförmigem   Querschnitt, der an beiden Seiten durch autogene oder elektrische Schweissung am Schaft befestigt wird. 



   Der Bund gemäss Fig. 3 wird vorwiegend nur von einer Seite her   verschweisst.   



   Es kann aber auch gemäss Fig. 4 der ganze Bund durch   Auftragsschweissun ? hergestellt werden.   
 EMI1.1 
 gezogen oder aufgepresst werden (Fig. 5). 



   Es kann aber auch das ganze Einsteckende, wie in Fig. 6 dargestellt, mit dem Bund   vorbereitet   und sodann an die stumpf anstossende Stahlstange angeschweisst werden. 



   PATENT-ANSPRÜCHE :
1. Herstellung von Bunden an Hohlbohrern, derart, dass der Faserverlauf der Stande erhalten und das Loch in der Stange völlig unverändert bleibt, insbesondere durch Anschweissen. Aufschrumpfen oder Anpressen eines Ringes an die hohle Stange oder durch Herstellung des Bundes durch Auftrags-   schweissung.   
 EMI1.2 
 

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



   <Desc / Clms Page number 1>
 



  Process for producing collars on hollow drills.



   The collars of hollow drills have hitherto been made by upsetting the rolled bar while it is warm. The sudden increase in cross-section caused by this upsetting now leads to the formation of a fold b (see FIG. 1 of the drawing) in the interior of the hole, which is the reason for premature drill smudges.



   According to the invention, the formation of wrinkles and thus breakage of the drill at this endangered point is completely avoided by means of completely different manufacturing processes of the federal government. The covenant is no longer made by compressing the rod as it was before. but in such a way that the fiber course of the rod is retained, the high level of heating required during upsetting and the associated structural changes are avoided and the hole in the rod remains completely unchanged.



   The procedure can be carried out in various ways.



   Fig. 2 of the drawing illustrates a collar with a triangular cross-section, which is attached to the shaft on both sides by autogenous or electrical welding.



   The collar according to FIG. 3 is mainly welded from one side only.



   However, according to FIG. getting produced.
 EMI1.1
 be pulled or pressed on (Fig. 5).



   However, the entire insertion end, as shown in FIG. 6, can also be prepared with the collar and then welded to the butt-abutting steel rod.



   PATENT CLAIMS:
1. Manufacture of collars on hollow drills in such a way that the grain is maintained and the hole in the rod remains completely unchanged, in particular by welding. Shrink-fitting or pressing a ring onto the hollow rod or by making the collar by welding.
 EMI1.2
 

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

 

Claims (1)

dadurch gekennzeichnet, dass ein mit Bund versehenes Einsteckende au die Stahlstange angeschweisst wird (Fig. 6). EMI1.3 **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. characterized in that an insertion end provided with a collar is welded onto the steel rod (Fig. 6). EMI1.3 ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT125156D 1930-10-04 1930-10-04 Process for producing collars on hollow drills. AT125156B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT125156T 1930-10-04

Publications (1)

Publication Number Publication Date
AT125156B true AT125156B (en) 1931-10-26

Family

ID=3634190

Family Applications (1)

Application Number Title Priority Date Filing Date
AT125156D AT125156B (en) 1930-10-04 1930-10-04 Process for producing collars on hollow drills.

Country Status (1)

Country Link
AT (1) AT125156B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2920139A1 (en) * 1979-05-18 1980-11-20 Ruhrkohle Ag Impact drill bit for underground mining - has additional weights arranged as collars surrounding bits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2920139A1 (en) * 1979-05-18 1980-11-20 Ruhrkohle Ag Impact drill bit for underground mining - has additional weights arranged as collars surrounding bits

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