Abstract: A manifolded, multiple-pin die apparatus and method processes potentially explosive material to form longitudinally perforated cylindrical pellets for use as gun propellants. A main entrance passage formed in mating manifold blocks gradually changes in cross-sectional configuration from circular to figure-eight, and then branches in a gently curved manner. The divergent branches formed then further branch in the same manner and feed circular cross-section passages leading to extruding dies wherein a series of die pins extend axially through a discharge passage. Each die comprises a central core member supporting an outer shell via radial ribs which are configured to form flow passages of hour-glass configuration. No change of flow direction in the entire apparatus exceeds fifteen degrees.
Type:
Grant
Filed:
August 29, 1988
Date of Patent:
August 7, 1990
Assignee:
APV Chemical Machinery, Inc.
Inventors:
Bernard A. Loomans, James E. Kowalczyk, Jerry W. Jones