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US 4,054,425 AGranted
Process of making a grinding wheel assembly
OwnerWilliam F. Shermaninventor
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Abstract
A method of making grinding wheel mounts by molding a central hub onto a thermoset plastic abrasive disc is provided. An aromatic polycarbonate thermoplastic resin is molded to form a hub on a cured thermoset plastic abrasive disc. It is believed that the polycarbonate forms both a mechanical and chemical bond with the thermoset plastic to provide an efficient method of producing grinding wheels.
Claims8
A process of making a grinding wheel assembly in a molding apparatus having two mold halves comprising sequentially the steps of:
- inserting a thermoset phenolic plastic abrasive disc into one mold half of the molding apparatus;
- moving the two mold halves together to form a die cavity with a threaded insert being caused to extend through the abrasive disc;
- forcing under pressure by injection means through a nozzle a softened phenol-based thermoplastic resin into the die cavity to form a hub on the abrasive disc about the insert;
- and
- removing the insert.
2 more elements
Dependencies are inferred from the claim text.