Method and apparatus for molding parts having an aspherical surf

Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Changing mold size or shape during molding or with shrinkage...

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264313, 2643287, 425808, B29D 1100, B29F 106

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active

044473729

ABSTRACT:
Molded thermoplastic parts with aspherical surfaces are produced with molds whose molding-cavity surfaces are of spherical development and are elastically deformable. The spherical surfaces are so deformed in specific manner by the pressure of the thermoplastic material during the molding process that predetermined aspherical surfaces are produced. Aspherical surfaces of non-rotational symmetry are produced by additional, yieldably mounted auxiliary pistons which are connected to a hydraulic system.

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