B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 43/36 (2006.01) B29C 33/20 (2006.01) B29C 33/30 (2006.01)
Patent
CA 2288826
A positive mold is described with a core (3) and a female mold member (4) as well as wraparound peripheral dies (7), which are attached to the core for movement in closing direction and completely surround the core (3). In the region of the impact areas of the peripheral dies (7) upon the female mold member (4), the impacting surfaces are configured complementary, for example planar. The invention is characterized by the fact that each peripheral die (7) is attached laterally to the core by at least one spacer and retaining element (8, 10), with the spacer element (8) being slightly greater than the cross section of the peripheral die, so that a small gap (9) of preferably between 0.01 mm and 0.02 mm is formed. The fixed tolerance gap offers the advantage that constant, minimum frictional conditions exist. The lateral attachment facilitates the replacement of individual peripheral dies (7) and temperature-based dimensional changes of the core (3) are followed by the peripheral dies, without risk of jamming.
L'invention concerne un outil à bords plongeants comprenant une âme (3), une matrice (4) et des baguettes de bordure plongeante (7) appliquées sur la circonférence de l'âme (3) de façon mobile dans le sens de fermeture et qui entourent complètement l'âme. Dans la zone des faces de butée des baguettes de bordure plongeante (7) contre la matrice (4), les surfaces qui se rencontrent ont une forme correspondante, par exemple, plate. L'invention est caractérisée en ce que chaque baguette de bordure plongeante (7) est fixée sur le côté de l'âme à l'aide au moins d'un élément d'écartement et de maintien (8, 10). L'élément d'écartement (8) est légèrement plus long que la section transversale de la baguette de bordure plongeante de façon à obtenir une petite fente (9) comprise, de préférence, entre 0,01 mm et 0,02 mm. Cette fente de tolérance fixe présente l'avantage de rapports de frottement minimaux constants. La fixation latérale facilite le remplacement des différentes baguettes de bordure plongeante (7). De plus, les baguettes de bordure plongeante (7) suivent les modifications dimensionnelle de l'âme (3) dues à la température suivent sans risque de coincement.
Fetherstonhaugh & Co.
Krauss-Maffei Kunststofftechnik Gmbh
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