Patent EP-2363263-A1 (EP)
Inventor: NOBS STEFAN
IPC: B22D17/22
Filed: 2010-03-05
Abstract: The centering device for a shaping tool such as injection-molding tool or die casting tool, comprises first mold halves (1) and second mold halves (5), which are guided from a closed position by a guiding unit and are processable in an opened position and vice-versa, where the respective partition surfaces of the both the mold halves are pressed to each other in the closed position. The centering device is formed from the guiding bodies protrusively introduced on the first mold halves and the guiding recesses introduced on the second mold halves. The centering device for a shaping tool such as injection-molding tool or die casting tool, comprises first mold halves (1) and second mold halves (5), which are guided from a closed position by a guiding unit and are processable in an opened position and vice-versa, where the respective partition surfaces of the both the mold halves are pressed to each other in the closed position. The centering device is formed from the guiding bodies protrusively introduced on the first mold halves and the guiding recesses introduced on the second mold halves, where the both mold halves are exactly centered in the closed position through the guiding recesses. Each protruding guiding body is formed from a circularly-cylindrical bolt (8), to which a rolling body-cage (11) is with rolling bodies inserted in rows. The rolling body is positioned by a positioning unit in an opened state, so that a first rolling body row aligned against the first mold halves lie on a circularly-cylindrical surface of the bolt and a second rolling body row lie on an edge finally surrounding the circularly-cylindrical surface of the bolt. Each guiding recess is formed from a sleeve (9) with a circularly-cylindrical inner surface, which proceeds up to the rolling body of the rolling body-cage during closing the shaping tool. Further rolling body rows are provided before the first rolling body row and/or after the second rolling body row. The bolt has an area connecting to the edge concluding the circularly-cylindrical surface, where the area is formed by a further circularly-cylindrical surface, which has a smaller diameter than the circularly-cylindrical surface. A transition from the edge to the further circularly-cylindrical surface is provided with a curvature, which is adapted to the curvature of the rolling body. The sleeve has a further edge concluding the circularly-cylindrical inner surface aligned against the rolling body, where a conical retraction area connects itself to the further edge. The bolt is provided with a head, which is inserted and fixed into the first mold halves. The positioning unit is formed from two pins, which are distributedly introduced at the rolling body-cage over the circumference, are aligned parallel to the axis of the bolt and guidably displaced into the holes introduced in the head of the bolt. The pins are provided with heads at an end area turned away from the rolling body-cage, where the heads form stops with shoulders arranged on the holes. The stops determine the extending position of the rolling body-cage. Pressure springs are inserted into the holes and press the heads of the pins against the shoulders. The connection between the pins and the rolling body-cage takes place over a retaining ring, which is inserted into a groove surrounding the rolling body-cage and protrudes into the slits, which are introduced on the pins. The rolling bodies are rollers or balls.