Patent ID: 6425752
Filing Date: 2002-07-30
Classification: B29C,B29K,Y10T

Abstract:
In a mold assembly including spaced, moveable mold parts, one mold part including a hollow cavity having a cavity inner surface configured to form an outer wall of an elongated, generally annular molded part and the other mold part including a corresponding core element having a core outer surface configured to form an inner wall of the molded part, the core element being at least partially disposed within the cavity and the core outer surface spaced from the cavity inner surface defining a generally annular mold chamber for receiving molten material to be molded to the shape of the molded part, the core element having a first portion and a second portion that defines an end portion of the core outer surface; the core element further including a generally tubular core inner surface and a fluid inlet pipe coaxially disposed within the core element, the fluid inlet pipe having a pipe outer surface spaced from the core inner surface, one end of the fluid inlet pipe configured to connect to a source of coolant and a second end of the pipe being in fluid communication with the plurality of coolant passages; the improvement comprising: said first portion of said core element made from high strength material and configured as a part of the core outer surface and said second portion of said core element formed of a high strength alloy material resistant to impact damage and having greater thermal diffusivity and thermal conductivity than said first portion, the high strength material at said open end.