Martensite roll
AssigneeValmet Paper Machinery Inc.
InventorJari Vahapesola
Life of this patent
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Abstract
The invention is related to a process for the manufacture of a roll, in particular of a calender roll for a paper machine. In the process, the mantle of the roll is cast or cast and heat-treated and, in the next step, the roll mantle is machined. In the process, the surface layer of the cast-iron roll mantle is hardened and tempered so that, in the surface layer of the roll mantle, a temper-martensitic structure is produced. The roll mantle is then subjected to finishing machining in a manner known in the art. The invention is also related to a roll, in particular a calender roll for a paper machine, which roll is provided with a cast-iron mantle. The surface layer of the roll mantle is hardened and tempered so that the surface layer of the roll mantle is temper-martensitic.
Claims16
A roll for use in a paper machine, said roll having a cast-iron roll mantle, an outer surface of said roll mantle being hardened and tempered such that it has a homogeneous, fine and uniform microstructure of martensite.
A roll for use in a paper machine, comprising
- a roll having a cast-iron cylindrical roll mantle having a homogeneous, fine and uniform microstructure and a hollow roll core,
- axle journals located on opposite ends of said roll mantle, and
- an outer surface of said roll mantle having a thickness from about 8 mm to about 10 mm and having a homogeneous, fine and uniform microstructure of martensite.
Dependencies are inferred from the claim text.