Patent ID: 9205611
Filing Date: 2015-12-08
Classification: B29C,B29D,B29L,F16H,Y10T

Abstract:
1. A method of manufacturing a composite gear blank, comprising a rigid centerpiece and an outer part made of a plastic material, said centerpiece being substantially disk-shaped with two disk-faces substantially parallel to each other, said outer part being cast around a peripheral surface of said centerpiece, wherein said composite gear blank has the following properties: a) when determined at a temperature of up to 25° C.: and b) when determined at a higher temperature of up to 120° C.: wherein said normal adhesion strength S i) a tangential adhesion strength S ii) an axial adhesion strength S comprising the steps of: a) providing at least one rigid centerpiece having a structured peripheral surface to be surrounded by said plastic material; b) surface roughening said peripheral surface; c) surface conditioning the centerpiece; d) placing the centerpiece in a mold; e) optionally inertizing the mold by flushing with an inert gas; f) adding a liquid reactive mixture into the mold until the liquid reaction mixture at least partially surrounds the centerpiece; g) applying a static pressure to the mold containing the liquid reactive mixture; h) polymerizing the reactive mixture to form said outer part; wherein surface conditioning comprises applying an organofunctional silane compound onto the peripheral surface and wherein, after step h), the centerpiece is subjected to a controlled heating step so as to locally melt the plastic material in a region adjacent to the centerpiece, followed by forced cooling of the centerpiece.