Method of compacting the surface of a sintered part

B - Operations – Transporting – 22 – F

Patent

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Details

B22F 3/16 (2006.01) B22F 3/24 (2006.01)

Patent

CA 2662392

The invention describes a method of compacting the surface of a sintered part (2), in which a sintered part (2) is moved in a die tool (1) along an axis (3) in a pressing direction (20) through a number of die portions (7, 8, 9) from a first die portion (7) at a first die opening (6) to a last die portion (9), wherein a wall area (16) of each die portion (7, 8, 9) forms at least one pressing area (18), against which a contact area (17) that is formed by an outer area (12) of the sintered part (2) is pressed, and an inner contour (25) that lies in a cross section with respect to the axis (3) and is defined by the pressing area (13) corresponds at least approximately to an outer contour (26) that is defined by the contact area (17). During the movement of the sintered part (2), the compacting of the surface takes place from the first die opening (6) to the last die portion (9) through die portions (7, 8, 9) that steadily merge one into the other and through monotonously decreasing inside diameters (19) of the die portions (7, 8, 9), measured between interacting pressing areas (18).

L'invention concerne un procédé de densification de la surface d'une pièce frittée (2), selon lequel une pièce frittée (2) est déplacée dans un outil matrice (1) le long d'un axe (3) dans le sens de compression (20) à travers plusieurs segments de matrice (7, 8, 9) entre un premier segment de matrice (7) situé au niveau d'un premier orifice de matrice (6) et un dernier segment de matrice (9), une surface de paroi (16) de chaque segment de matrice (7, 8, 9) formant au moins une surface de compression (18) contre laquelle est comprimée une surface de contact (17) formée par une surface extérieure (12) de la pièce frittée (2), et un contour intérieur (25), défini par la surface de compression (18) et situé dans une section transversale par rapport à l'axe (3), correspondant au moins approximativement à un contour extérieur (26) défini par la surface de contact (17). Lors du déplacement de la pièce frittée (2), la densification de surface a lieu du premier orifice de matrice (6) au dernier segment de matrice (9), au moyen des segments de matrice (7, 8, 9) passant de manière continue de l'un à l'autre, les diamètres intérieurs (19) des segments de matrice (7, 8, 9) diminuant de manière uniforme et étant mesurés entre les surfaces de compression (18) coopérantes.

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