Extruder screw with long wearing surfaces

摘要

A method of extending the life of an extruder screw by affixing tiles of wear-resistant material along the crest of the extruder screw flighting threads, and optionally grinding the hardened material to remove any sharp edges. In another configuration of the present invention, plates of wear-resistant material are secured to the leading edges of the extruder screw threads to further prolong the life of the extruder screw.

主权项

1. An extruder screw, comprising:
a generally cylindrical shaft; at least one thread extending from the periphery of the shaft, the thread having a leading face, a trailing face, and a fightingflighting crest, and the fightingflighting crest being generally parallel to the periphery of the shaft; a plurality of rows of wear-resistant tiles, each tile having a wear surface and an opposite binding surface, and each tile having a plurality of edges, wherein the binding surface of each tile is adapted to be bonded to the thread; a first row of tiles that are secured to the leading face of the thread, wherein at least one edge of each tile in the first row is generally aligned with the fightingflighting crest of the thread; and a second row of tiles that are secured to the fightingflighting crest of the thread, wherein at least one edge of each tile in the second row is generally aligned with the wear surface of at least one tile in the first row.