Green compact of a stator-cover unit

A press with a tool for manufacturing a green compact of a stator-cover unit including a first partial green compact, as a stator, made of a first sinter material, in each case with a first end-face side and a second end-face side pointing in an axial direction, and in between a plurality of webs having lateral web flanks, wherein the webs, starting from an outer stator wall running in a circumferential direction, extend inwardly in a radial direction and are spaced apart from one another in the circumferential direction, so that the stator wall in each case forms an inner circumferential surface between the webs, and further including a second partial green compact, as a cover, made of a second sinter material, having an outer circumferential surface running in the circumferential direction and situated on the first end-face side of the stator and at least partially covering a first area extending between the webs and within the stator wall, wherein the outer circumferential surface of the cover adjoins the inner circumferential surface and the web flanks of the stator and forms shared contact surfaces, in which the cover and the stator are joined together via these contact surfaces by a press fit, and the press further with a feeder for a sinterable, powdered sinter material, wherein the tool has at least the following components:

• a first upper punch and a first lower punch that form a first filling chamber for producing the first partial green compact that forms the stator;
• a second upper punch and a second lower punch that form a second filling chamber for producing the second partial green compact that forms the cover;
• a displacement drive for moving the first partial green compact and the second partial green compact together, with exertion of pressure on the first partial green compact and the second partial green compact to provide a press fit between the partial green compacts;
• wherein the press allows production of the first partial green compact, the second partial green compact, and the green compact in a single work operation.

A method for manufacturing a green compact of a stator-cover unit using a press, the green compact including a first partial green compact, as a stator, made of a first sinter material, in each case with a first end-face side and a second end-face side pointing in an axial direction, and in between a plurality of webs having lateral web flanks, wherein the webs, starting from an outer stator wall running in a circumferential direction, extend inwardly in a radial direction and are spaced apart from one another in the circumferential direction, so that the stator wall in each case forms an inner circumferential surface between the webs, and further including a second partial green compact, as a cover, made of a second sinter material, having an outer circumferential surface running in the circumferential direction and situated on the first end-face side of the stator and at least partially covering a first area extending between the webs and within the stator wall, wherein the outer circumferential surface of the cover adjoins the inner circumferential surface and the web flanks of the stator and forms shared contact surfaces, in which the cover and the stator are joined together via these contact surfaces by a press fit, and the press with a tool for manufacturing a green compact of a stator-cover unit and with a feeder for a sinterable, powdered sinter material, wherein the tool has a first upper punch and a first lower punch that form a first filling chamber for producing the first partial green compact that forms the stator, a second upper punch and a second lower punch that form a second filling chamber for producing the second partial green compact that forms the cover, and a displacement drive for moving the first partial green compact and the second partial green compact together, with exertion of pressure on the first partial green compact and the second partial green compact to provide a press fit between the partial green compacts wherein the press allows production of the first partial green compact, the second partial green compact, and the green compact in a single work operation, the method comprising at least the following steps:

• a) producing the first partial green compact in a first work chamber of the tool by pressing a first sinter material;
• b) producing the second partial green compact in a second work chamber of the tool by pressing a second sinter material;
• c) moving the first partial green compact relative to the second partial green compact and joining the partial green compacts with provision of a press fit;
• d) sintering the one-piece green compact to form a one-piece stator-cover unit, so that sintering takes place, at least partially, at adjoining shared contact surfaces of the partial green compacts.