Cavity insert film flow cooling

摘要

A cavity insert for a mold stack is disclosed, the cavity insert being dimensioned to define a continuous annular cavity insert cooling chamber. The cavity insert also provides a first and second decompression chamber in fluid communication with each end of the cavity insert cooling chamber. Also disclosed is a chamber extension feature in fluid communication with the cavity insert cooling chamber to promote cooling in the downstream region of the cavity insert.

主权项

1. A mold assembly for an injection molding machine comprising:
a cavity plate; a cavity insert received in a bore in the cavity plate, an outer surface of the cavity insert being in contact with the cavity plate at an upstream point and a downstream point that are longitudinally spaced from each other, wherein a length of the cavity insert between the upstream and downstream points is spaced within the bore from the cavity plate to define at least in part
an upstream annular decompression chamber for receiving a supply of cooling fluid from a cooling fluid inlet andan annular film cooling chamber having an upstream end that is in fluid communication with the upstream annular decompression chamber, wherein a cross-sectional area of the annular film cooling chamber is uniform from the upstream end to a downstream end thereof and is less than a cross-sectional area of the upstream annular decompression chamber, and wherein the annular film cooling chamber is for delivering a cooling fluid received from the upstream annular decompression chamber in a uniform film flow along the length of the cavity insert.