AT137185B

AT137185B - Method and device for the production of hard bodies, in particular for cutting, drawing and other tools made of hard carbides, hard nitrides and the like. like

Info

Publication number: AT137185B
Authority: AT
Inventors: Anton Ing Kratky
Original assignee: Anton Ing Kratky
Priority date: 1932-05-19
Filing date: 1932-05-19
Publication date: 1934-04-10

Description

  

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  Verfahren und Vorrichtung zur Herstellung von   Hartkorpern,   insbesondere für Schneid-, Zieh-und andere Werkzeuge aus Hartkarbiden,   Hartnitriden   u. dgl. 



   Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Herstellung von Hartkörpern, insbesondere für Schneidwerkzeuge und andere Arbeitsgeräte aus Hartkarbiden, Hartnitriden u.   dgl.,   die unter Druck vorgeformt und bis zu ihrer Sinterungstemperatur vorerhitzt und nachher unter Anwendung hohen Druckes und starker Erhitzung verdichtet werden. Das Verfahren besteht darin, dass die für die Verdichtung erforderliche Erhitzung, etwa durch Kohlenelektroden, zwischen welche der über einer Matrize angeordnete Formkörper geklemmt wird, vor dem Verdichten vorgenommen und der zum Verdichten erforderliche Druck durch einen Schlag mit einem Stempel erzeugt wird, welcher während der Erhitzung unter Belassung eines Zwischenraumes über dem Formkörper liegt. 



   Eine Ausführungsform der Vorrichtung zur   Durchführung   des Verfahrens gemäss der Erfindung ist in der Zeichnung dargestellt. Fig. 1 zeigt einen lotrechten Längsschnitt und Fig. 2 einen Schnitt nach der Linie A-B der Fig. 1. 
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   Unterhalb dieser Blöcke und oberhalb der Stahlmatrize   l   sind Kohlenelektroden M senkrecht zur   Schlagrichtung   angeordnet, welche zwischen sich den Formkörper   z   aufnehmen und ihn mittels zweier durch Druckwalzen r auf die äusseren Enden der Elektroden wirkender Blattfedern q oberhalb der Matrize l und knapp unterhalb der   Unterfläehe   des Sehlagstempels 01 festhalten. Durch die Federn q, die mittels Schrauben s und Klemmen   u   an die Kabel v angeschlossen sind, wird den Elektroden Strom zur Erhitzung des Körpers   z   zugeführt.

   Der Stutzen x dient zum Entlüften der Glocke, da das Erhitzen und Verdichten im luftleeren oder luftverdünnten Raum oder aber in einem indifferenten Gas vorgenommen wird. 

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



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  Method and device for the production of hard bodies, in particular for cutting, drawing and other tools made of hard carbides, hard nitrides and the like. like



   The invention relates to a method and a device for the production of hard bodies, in particular for cutting tools and other tools made of hard carbides, hard nitrides and the like. Like., which are preformed under pressure and preheated to their sintering temperature and then compacted using high pressure and strong heating. The method consists in that the heating required for the compaction, for example by carbon electrodes, between which the shaped body arranged above a die is clamped, is carried out before the compaction and the pressure required for compaction is generated by a blow with a punch, which during the Heating, leaving a space above the molded body.



   An embodiment of the device for performing the method according to the invention is shown in the drawing. 1 shows a vertical longitudinal section and FIG. 2 shows a section along the line A-B of FIG.
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   Below these blocks and above the steel die l, carbon electrodes M are arranged perpendicular to the direction of impact, which take up the shaped body z between them and place it above the die l and just below the lower surface of the punch by means of two leaf springs q acting on the outer ends of the electrodes through pressure rollers r 01 hold tight. Through the springs q, which are connected to the cables v by means of screws s and clamps u, current is supplied to the electrodes for heating the body z.

   The nozzle x is used to vent the bell, since the heating and compression is carried out in a vacuum or air-diluted room or in an inert gas.

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

Claims

First of all, a cake of powdered hard nitride or hard nitrides or a mixture of several carbides and / or nitrides with or without auxiliary metal or metals is produced by pressing and subsequent pre-sintering at around 500-10000 C. This is clamped between the electrodes 111, then the bell is attached and vented. As soon as a sufficient air void is reached, an electric current of about 1000 A or more, depending on the strength of the body z, is fed to the electrodes via the springs q, which brings the shaped body to bright white heat (1500-2200 C and above).

After the desired high sintering temperature has been reached, a heavy blow is exerted on the punch by a falling heavy weight, whereby the molded body 2 is pressed into the die 1 with great force in a highly heated state. After cooling it will EMI1.2 PATENT CLAIMS: 1. Process for the production of hard bodies, in particular for cutting, drawing and other tools made of hard carbides. Hard nitrides u. The like. Which are compacted in the pre-sintered, shaped state using high pressure and strong heating, characterized in that the heating is carried out before the compacting and the pressure required for compacting is generated by sleep. <Desc / Clms Page number 2>

2. Apparatus for carrying out the method according to claim 1, characterized in that electrodes made of carbon or the like are arranged approximately perpendicular to the impact direction above the die for the molded body, between which the pre-sintered molded body is clamped for the purpose of electrical resistance heating, the lower surface of the punch is just above the surface of the molding before the strike, EMI2.1