Coated pelletizing extrusion dies and method for making the same
AssigneeKennametal Inc.
InventorsSudhir Brahmandam, Dave Richard Siddle, Irene Spitsberg
Life of this patent
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Abstract
A pelletizing extrusion die comprising a die body contains a plurality of extrusion holes. Each of the extrusion holes is defined by a defining surface of the die body wherein at least a portion of the defining surface has a low-friction coating deposited thereon. A method for applying the low-friction coating to the defining surface wherein the applying step occurs at a temperature equal to less than about 520° C.
Claims13
A method of coating a defining surface of a pelletizing extrusion die body contains a plurality of extrusion holes, and wherein each of the extrusion holes being defined by the defining surface of the die body, the method comprising the steps of:
- applying a low-friction coating to at least a portion of the defining surface at a temperature equal to less than about 520° C.
A method of coating at least a portion of a defining surface of a cylindrical pelletizing extrusion body having an inner cylindrical face and an outer face, and the cylindrical pelletizing extrusion die body further containing a plurality of extrusion holes extending radially through the cylindrical pelletizing extrusion die body, and wherein each of the extrusion holes being defined by the defining surface of the cylindrical extrusion die body wherein the defining surface having a generally frusto-conically shaped unobstructed entrance section adjacent to the inner cylindrical face and an exit section extending from the entrance section to the outer face, the method comprising step of:
- applying a metallurgically-bonded low-friction coating having a substantially constant thickness, on the entrance section of the defining surface and the exit section of the defining surface.
A method of coating at least a portion of a defining surface of a cylindrical pelletizing extrusion body having an inner cylindrical face and an outer face, and the cylindrical pelletizing extrusion die body further containing a plurality of extrusion holes extending radially through the cylindrical pelletizing extrusion die body, and wherein each of the extrusion holes being defined by the defining surface of the cylindrical extrusion die body wherein the defining surface having a generally frusto-conically shaped unobstructed entrance section adjacent to the inner cylindrical face and an exit section extending from the entrance section to the outer face, the method comprising step of:
- applying a metallurgically-bonded low-friction coating having a substantially constant thickness, on the exit section of the defining surface.
Dependencies are inferred from the claim text.