Nitrided H13-alloy cylindrical pelleting dies

Details Nitrided H13-alloy cylindrical pelleting dies Nitrided H13-alloy cylindrical pelleting dies

1998-07-28

2000-04-25

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

Means forming from bulk and downstream severing means

425331, 425464, 425DIG230, B29B 900

Patent

active

060537221

ABSTRACT:
A pelleting die is provided, preferably in cylindrical form. The die includes a cylindrical body having inner and outer cylindrical surfaces and holes through the surfaces in which particulate material is extruded to form pellets. The die is formed of an H-group steel alloy, preferably H13 alloy, with the surfaces being nitrided to provide increased surface hardness, resistance to wear, improved fatigue life and improved corrosion resistance.

REFERENCES:
patent: 4457686 (1984-07-01), Rowland
patent: 4496298 (1985-01-01), Munch
patent: 4574459 (1986-03-01), Peters
patent: 4659299 (1987-04-01), Pierik
patent: 4746698 (1988-05-01), Kouyama et al.
patent: 4765847 (1988-08-01), Arai et al.
patent: 5370171 (1994-12-01), Fields et al.
"Densification Equipment for the Chemical, Thermoplastic, and Process Industries," CPM Series C Process Pellet Mills brochure, Copyright CPM (1983).
"Gas Nitriding," Knerr et al.; Surface Hardening of Steel, pp. 387-409.
"Pelleting--Introduction and General Definitions," Robinson, Basic Processing Operations, p. 103 (No date).
"Hot-Work Steels," Specialty Steels and Heat Resistant Alloys, p. 762.

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