The invention relates to a molding device (1) for molding a material around a core (2), comprising a hollow molding chamber (3) adapted to receive the core (2), and means for controlling the shape. of the core (2) in the hollow enclosure (3), the control means comprising means for deformation of the core (2). The control means further comprise force control means and a control unit (8) adapted to actuate the deformation means according to information given by the force control means. Figure for the abstract: Fig. 1
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