Device and method for runner-less molding of thermosetting...

B - Operations – Transporting – 29 – C

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B29C 45/27 (2006.01)

Patent

CA 2460173

A runner-less molding device for thermosetting resins and rubbers, characterized by a movable runner bush (15), through which an uncured or unvulcanized fluid material kept at a low temperature supplied from a pouring nozzle (31) can flow, is slidably arranged in a temperature controlling bush (13) communicating with a gate (4) of a cavity (1); an insulation space (A) is formed by moving the movable runner bush (15) apart from the gate (4) during heating; a valve pin (18) is movably inserted into said movable runner bush (15); and the valve pin (18) is arranged so as to open and close the gate (4) in accordance with a pouring operation of the fluid material. A runner part of the movable runner bush containing molding material is constituted so as to move forward/backward relative to the cavity for preventing heat from conducting from the cavity, which is kept at a molding temperature, to the runner positioned apart from the gate for a long time, so that material loss generated in a sprue runner is reduced to almost null in order to reduce fabricating costs after molding and amount of wastes generated during after treatments. Thus, the improved molding device for the thermosetting resin and the rubber is obtained, and burdens on the global environment are alleviated.

L'invention concerne un procédé de moulage sans canaux de résine et de caoutchouc thermodurcissables consistant à monter coulissants des godets de coulée mobiles (15) qui permettent l'écoulement d'un matériau fluide fourni par une buse de remplissage (31) maintenu dans un état non durci et non vulcanisé à basse température dans des godets à température contrôlée (13) communiquant avec des entrées (4) de cavités (1), à séparer, pendant le traitement thermique, les distances séparant les godets de coulée mobiles (15) et les entrées (4) afin de former des parties d'espacement isolantes (A) et d'insérer des goupilles de soupape (18) dans les godets de coulée mobiles (15) de façon que les entrées (4) puissent être ouvertes et fermées par les goupilles de soupape (18) en rapport avec l'opération de remplissage du matériau fluide. Etant donné que pour empêcher que la température de formation élevée des cavités au moment du moulage ne se transmettent aux parties godets, on les tient à distance des entrées et qu'on atteint une répartition uniforme de la température de godet, il est possible d'éviter les pertes de matériau d'un godet cylindrique peuvent, de réduire le coût d'usinage secondaire et la quantité de matériau rejeté sous forme de déchets industriels, d'augmenter la formabilité et de réduire la charge pour l'environnement.

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