One-piece joint body

Abstract

The invention relates to a method for producing a metal component, in particular an internal joint part of a Cardan joint, which is provided with a ball path. According to the invention: a charge cavity is filled with powder; the charge cavity is delimited by means of a die, at least one molding mandrel and a charging mandrel positioned opposite the latter, a central mandrel and at least one lower and upper punch; the powder is compressed in the charge cavity by pressure on the upper and/or lower punch to form a green product, which is then expelled and sintered

What is claimed:  
     
         1 . A process for the manufacture of a metallic sintered part, in particular an internal joint part ( 3 ) of a cardan joint ( 1 ), which is provided with a ball path ( 7 ), whereby a charge cavity ( 28 ) is filled with powder, the charge cavity ( 28 ) is delimited by means of a die ( 27 ), at least one molding mandrel ( 22 ) and a charging mandrel ( 23 ) positioned opposite the latter, a central mandrel ( 26 ), and at least one lower and upper punch ( 24 ,  25 ); the powder is compressed in the charge cavity by pressure on the upper and/or lower punch ( 24 ,  25 ) to form a green product, which is then expelled and sintered.  
     
     
         2 . The process according to  claim 1 , characterized by the fact, that for the charging process, the charging mandrel ( 23 ) runs into the die ( 27 ) in a charging position, and the lower punch is maintained in a charging position. During the pressing procedure, the molding mandrel that is attributed to the charging mandrel ( 23 ) runs into the die ( 27 ), whereby the molding mandrel ( 22 ) pushes the charging mandrel downward in the die ( 27 ) and the ball paths are thereby shaped in powder through the geometry of the molding mandrel ( 22 ). At the same time, the upper punch runs into the die until at upper punch pressing position, and the powder is compressed to the green product whereby ball paths ( 7 ) are created through the geometry of the die. The lower punch runs into the die until at lower punch ( 24 ) pressing position and also the powder is compressed. The upper punch ( 25 ) and molding mandrel ( 22 ) extend from the die ( 27 ) and the central mandrel ( 26 ) is withdrawn from the green product ( 3 ) during the discharge procedure.  
     
     
         3 . The process according to  claim 1 , characterized by the fact, that the side of the charging mandrel ( 23 ) in the charging position, which is turned towards the molding mandrel ( 22 ), flushes with the top side ( 30 ) of the die ( 27 ) and the top side of the central mandrel ( 26 ), that the molding mandrel ( 22 ) in the charging positions is positioned at the top side ( 31 ) of the charging mandrel ( 23 ) and pushes these back. At the same time pressure is exercised on the upper punch ( 25 ), which runs into the die ( 27 ), and afterwards the upper punch ( 25 ) and molding mandrel ( 22 ) extend from the die ( 27 ) and the newly pressed green product ( 3 ) is expelled from the die ( 27 ) through the lower punch ( 24 ).  
     
     
         4 . The process according to  claim 1 , characterized by the fact, that the powder is compressed to a green product through pressure and heat.  
     
     
         5 . The process according to  claim 1 , characterized by the fact, that the die and at least on punch ( 24 ,  25 ) is heated up during the pressing.  
     
     
         6 . The process according to  claim 1 , characterized by the fact, that the shape of the ball paths ( 7 ) is created by the molding mandrel ( 27 ).  
     
     
         7 . The process according to  claim 1 , characterized by the fact, that the shape of the ball paths ( 7 ) is formed by the molding mandrel ( 22 ) and the die ( 27 ).  
     
     
         8 . The process according to  claim 1 , characterized by the fact, that the surface of the ball paths ( 7 ) is compressed after sintering.  
     
     
         9 . The process according to  claim 1 , characterized by the fact, that the surface of the ball paths ( 7 ) is compressed at least by a one ball ( 32 ) after sintering, the pressure is exercised vertically onto the ball path surface, whereby the compression can occur in cold and hot conditions.  
     
     
         10 . The process according to  claim 9 , characterized by the fact that the ball ( 32 ) at least once compresses at least a partition of the ball path ( 7 )  
     
     
         11 . The process according to  claim 1 , characterized by the fact, that the readymade sintered component ( 3 ) is subsequently forged, whereby the sintered component ( 3 ) is inserted in the die ( 27 ) on a central mandrel ( 26 ) by means of ball paths ( 7 ), a forging tool of the same build for shaping the external outline of the sintered component ( 3 ) presses, and is afterwards expelled.  
     
     
         12 . The process according to  claim 1 , characterized by the fact, that the readymade sintered component ( 3 ) is calibrated after sintering or forging, whereby this component is inserted in the die ( 27 ) on a central mandrel ( 26 ) by means of ball paths ( 7 ), a calibration tool of the same build for shaping the external outline of the sintered component ( 3 ) presses, and is subsequently expelled.  
     
     
         13 . A process for the manufacture of a metallic component, in particular an internal joint part ( 3 ) of a cardan joint ( 1 ), which is provided with a ball path ( 7 ). A molding blank is thereby inserted in the die ( 27 ) on a central mandrel ( 26 ), a forging tool of the same build for shaping the external outline of the molding blank presses, and is afterwards expelled.  
     
     
         14 . A fixture for the manufacture of metallic components, in particular components made according to a sinter-metallurgic and/or forging process, particularly an internal joint part of a cardan joint ( 1 ), with ball paths ( 7 ), according to the process in correspondence with  claim 1 , characterized by a pressing fixture ( 21 ) with at least one molding mandrel ( 22 ) and at least one charging mandrel ( 23 ) attributed to the molding mandrel ( 22 ), one lower and one upper punch ( 24 ,  25 ) and one central mandrel ( 26 ), which shape the charge cavity ( 28 ) and are radially enclosed by a die ( 27 ).  
     
     
         15 . The fixture according to  claim 14 , characterized by the fact, that three molding mandrels ( 22 ) and three charging mandrels ( 23 ) attributed to the latter are provided, which are run in cavities ( 28 ) in the die ( 27 ).  
     
     
         16 . The metallic component, in particular a component manufactured according to a sinter-metallurgic and/or forging procedure, particularly an internal joint part ( 3 ) of a cardan joint ( 1 ), with ball paths ( 7 ) positioned on the external perimeter, manufactured according to the process in correspondence with the process  claim 24 , characterized by the fact, that the sintered component is made of one piece.  
     
     
         17 . The metallic component, in particular a component manufactured according to a sinter-metallurgic and/or forging procedure, particularly an internal joint part ( 3 ) of a cardan joint ( 1 ), according to claim  24 characterized by the fact, that the ball paths ( 7 ) are positioned in an angle towards the pressing axle ( 20 ) and/or are curved towards the pressing axle ( 20 ).  
     
     
         18 . The metallic component, in particular a component manufactured according to a sinter-metallurgic and/or forging procedure, particularly an internal joint part ( 3 ) of a cardan joint ( 1 ), according to one of  claim 24  characterized by the fact, that the ball paths ( 7 ) are round-shaped.  
     
     
         19 . The metallic component, in particular a component manufactured according to a sinter-metallurgic and/or forging procedure, particularly an internal joint part ( 3 ) of a cardan joint ( 1 ), according to  claim 24  characterized by the fact, that the ball paths ( 7 ) are roughly elliptically shaped.  
     
     
         20 . The metallic component, in particular a component manufactured according to a sinter-metallurgic and/or forging procedure, particularly an internal joint part ( 3 ) of a cardan joint ( 1 ), according to  claim 24  characterized by the fact, that the ball paths ( 7 ) are shaped with multiple corners.  
     
     
         21 . The metallic component, in particular a component manufactured according to a sinter-metallurgic and/or forging procedure, particularly an internal joint part ( 3 ) of a cardan joint ( 1 ), according to  claim 24  characterized by the fact, that the ball paths ( 7 ) show a higher density in partitions, particularly in the area of a ball path contact area ( 16 ,  16 ′).  
     
     
         22 . The metallic component, in particular a component manufactured according to a sinter-metallurgic and/or forging procedure, particularly an internal joint part ( 3 ) of a cardan joint ( 1 ), according to  claim 24  characterized by the fact, that the ball paths ( 7 ) are heat-treated in partitions, particularly in the area of a ball path contact area ( 16 ,  16 ′).  
     
     
         23 . The metallic component, in particular a component manufactured according to a sinter-metallurgic and/or forging procedure, particularly an internal joint part ( 3 ) of a cardan joint ( 1 ), according to  claim 24  characterized by the fact, that the ball paths ( 7 ) are surface-treated in partitions, particularly in the area of a ball path contact area ( 16 ,  16 ′).  
     
     
         24 . A metallic component, in particular a component manufactured according to a sinter-metallurgic and/or forging procedure, particularly an internal joint part ( 3 ) of a cardan joint ( 1 ), according to  claim 1.