摘要:
Progressive step and compound dies (50,66,78) are employed in a cold-working process to form a metallic pre-form (42) of selected mass into a precision-finished, pore-free, annular bushing (64) with a mass substantially equal to that of the pre-form (42), for use as a battery terminal which allows the fracture-free spin-over connection of a stem (46) of the bushing (64) to a battery cover (102) and the close-fit of the bushing (64) on a battery post (103) when the cover (102) is fitted to a battery casing.
摘要:
Progressive step and compound dies (50,66,78) are employed in a cold-working process to form a metallic pre-form (42) of selected mass into a precision-finished, pore-free, annular bushing (64) with a mass substantially equal to that of the pre-form (42), for use as a battery terminal which allows the fracture-free spin-over connection of a stem (46) of the bushing (64) to a battery cover (102) and the close-fit of the bushing (64) on a battery post (103) when the cover (102) is fitted to a battery casing.
摘要:
Process and apparatus for the cold extrusion of bushings (2) from cylindrical metal pieces or slabs, carried out by means of a single extrusion step, performed into an apparatus comprising a press body with a reciprocating punch (4), cooperating with a coaxial press die (8), including a coaxial seat adapted to receive the metal slab to be transformed in a bushing as well as a upper sleeve (6), slidably mounted about said punch and acting as guiding means for correctly centering said punch with regard of said piece during the extrusion step.
摘要:
A cold impact extrusion method for hollow metal elements, in particular cartridge cases, comprises the steps of placing a slug or blank in a die, pressing the blank within the die between a punch and counter-punch facing each other, during compression moving the punch forward in the die at a first velocity and moving the counter-punch backward at a second velocity slower than the first one, so as to reduce the distance between the punch and counter-punch. During movement, the punch head is caused to pass through die areas having different distances from the punch sides so as to identify an extrusion annulus of variable width between the die and punch. An extrusion unit for applying the method comprises a punch (11, 111, 211) and a counter-punch (12, 112, 212) facing each other and coaxially movable within a die (13, 113, 213) to identify an extrusion chamber (14, 114, 214) therebetween, which has a variable transverse size along the punch and counter-punch movement axis.
摘要:
L'outillage suivant l'invention comprend une filière fixe (4-6) réalisée sous la forme d'un poinçon (4) entouré d'une bague annulaire (6) pour la réalisation d'une jupe (11) d'un organe comportant en outre en bout d'arbre (12) axial opposé à cette jupe. Ce bout d'arbre est réalisé par une filière tubulaire (2) solidaire de la partie mobile de l'outillage. Cette filière (2) s'engage sans jeu dans l'alésage (8a) d'une matrice (8) frettée de manière que ladite filière se frette dynamiquement pendant le travail de filage dans ledit alésage. Extrusion à froid des métaux.
摘要:
The object of the present invention is to disclose a method of forming integrally an axis on a metallic plate at an arbitrary position thereof and perpendicularly to the surface thereof. The method comprises a first step of forward squeezing performed by a pressing process applied to a metallic plate 1 and a second step of extending the length of a projection formed in the first step by rear-squeezing performed by pushing a punch into the projection, thereby producing an axis with a sufficient height and high precision.