Method and device for producing a workpiece, particularly a shaping tool or a part of a shaping tool

Abstract

A method for producing a workpiece, particularly a shaping tool or a part of a shaping tool, includes the following steps: providing a heat-resistant mold ( 2 ) with a first molded part ( 2 a ) and at least a second molded part ( 2 b ) in a chamber that can be evacuated ( 1 ); filling a metal-containing material into the heat-resistant mold ( 2 ); producing a vacuum in the chamber that can be evacuated ( 1 ); heating the metal-containing material; compressing the heated metal-containing material in the heat-resistant mold ( 2 ) by hot pressing under vacuum conditions. The present invention further relates to a device for producing a workpiece, particularly a shaping tool or a part of a shaping tool.

1 - 20 . (canceled) 
     
     
         21 . A method for producing a workpiece, which comprises the following steps:
 providing a heat-resistant mold having a first mold part and at least one second mold part in an evacuable chamber, the heat-resistant mold being formed of concrete, cement, or mortar admixed with at least one ceramic material;   placing a metal-containing material into the heat-resistant mold;   generating a vacuum in the evacuable chamber;   heating the metal-containing material to form a heated material; and   compacting the heated material in the heat-resistant mold by hot pressing under vacuum conditions.   
     
     
         22 . The method according to  claim 21 , which comprises carrying out a plurality of flushings of the evacuable chamber with one of a reduction gas or an inert gas prior to generating the vacuum in the evacuable chamber. 
     
     
         23 . The method according to  claim 21 , which comprises generating a high vacuum in the evacuable chamber and hot-pressing the heated metal-containing material under high vacuum conditions. 
     
     
         24 . The method according to  claim 21 , which comprises placing the metal-containing material in the form of at least one layer of a metal-containing powder or of a metal-containing powder mixture into the heat-resistant mold. 
     
     
         25 . The method according to  claim 21 , which comprises carrying out at least one of the following further process steps:
 carrying out a cold-pressing step prior to heating the metal-containing material; and   at least partially melting the metal-containing material and compacting in an at least partially liquid state; and   removing the process heat in a targeted manner after compacting the metal-containing material.   
     
     
         26 . A method of producing a workpiece, which comprises the following steps:
 providing a heat-resistant mold having a first mold part and at least one second mold part in an evacuable chamber, the heat-resistant mold being formed of concrete, cement, or mortar admixed with at least one ceramic material;   placing a metal-containing material into the heat-resistant mold;   generating a vacuum in the evacuable chamber and maintaining the vacuum for a period of time t vacuum ;   generating an inert gas atmosphere or a reduction gas atmosphere in the evacuable chamber after an expiration of the period of time t vacuum ;   heating the metal-containing material to form heated material; and   compacting the heated material in the heat-resistant mold by hot pressing in the inert gas atmosphere or reduction gas atmosphere.   
     
     
         27 . The method according to  claim 26 , which comprises placing the metal-containing material in the form of at least one layer of a metal-containing powder or of a metal-containing powder mixture into the heat-resistant mold. 
     
     
         28 . The method according to  claim 27 , wherein the placing step comprises laying the metal-containing powder or the metal-containing powder mixture in at least two layers or regions having a different chemical composition. 
     
     
         29 . The method according to  claim 27 , which comprises carrying out at least one of the following further process steps:
 carrying out a cold-pressing step prior to heating the metal-containing material; and   at least partially melting the metal-containing material and compacting in an at least partially liquid state; and   removing the process heat in a targeted manner after compacting the metal-containing material.   
     
     
         30 . A device for producing a workpiece, comprising:
 an evacuable chamber;   a heat-resistant mold disposed in said evacuable chamber, said mold having a first mold part and at least one second mold part together forming a mold cavity for receiving a metal-containing material, said heat-resistant mold being formed of concrete, cement, or mortar admixed with at least one ceramic material;   a device for generating a vacuum in said evacuable chamber;   a device for heating said metal-containing material in said heat-resistant mold; and   a device for compacting the heated, metal-containing material in said heat-resistant mold by hot pressing.   
     
     
         31 . The device according to  claim 30 , wherein said mold cavity is configured to receive a metal-containing powder or a metal-containing powder mixture, and to form a shaping tool or a part of a shaping tool. 
     
     
         32 . The device according to  claim 30 , which further comprises a system for generating at least one of an inert gas atmosphere or a reduction gas atmosphere. 
     
     
         33 . The device according to  claim 30 , wherein said device for heating the metal-containing material comprises at least one heating element embedded in said heat-resistant mold. 
     
     
         34 . The device according to  claim 30 , which further comprises at least one cooling device for cooling the metal-containing material within said heat-resistant mold in a targeted manner. 
     
     
         35 . The device according to  claim 34 , wherein said cooling device is embedded in said heat-resistant mold. 
     
     
         36 . The device according to  claim 30 , wherein the concrete, cement or mortar of said mold contains at least 40% Al 2 O 3 . 
     
     
         37 . The device according to  claim 30 , wherein the concrete, cement or mortar of said mold has a strength greater than 150 MPa. 
     
     
         38 . The device according to  claim 30 , which further comprises a mechanically prestressed reinforcing ring for producing pressure stresses in the heat-resistant mold. 
     
     
         39 . The device according to  claim 30 , wherein at least sections of the surface of the mold cavity of said heat-resistant mold have a ceramic layer and/or a releasing-agent and lubricating layer. 
     
     
         40 . The device according to  claim 30 , wherein said device for compacting the metal-containing material comprises a metal cylinder operatively connected to said second mold part of said heat-resistant mold.