Aktiebolaget Skf

Ues, Inc.

Midwest Thermal-vac Inc.

Bryan A McCoy

John Timothy Roth

Rabi S Bhattacharya

Hitesh K Trivedi

Timothy W Piazza

Nathan Hipwell

Ron Radovich

Frederick J Otto

Mark A Ragen

Don Anthony

A method for producing a case-hardened martensitic stainless steel article includes: providing an article comprised, at least in part, of a martensitic stainless steel, carburizing the article within a temperature range of 1625&#xb0; F.-1680&#xb0; F. (885&#xb0; C.-916&#xb0; C.), and then carbo-nitriding the article within a temperature range of 1575&#xb0; F.-1625&#xb0; F. (857&#xb0; C.-885&#xb0; C.). An article, such as a bearing ring, comprising such a case-hardened martensitic stainless steel is also disclosed.

Carbo-nitriding process for martensitic stainless steel and stainless steel article having improved corrosion resistance

A method of imparting compressive residual stress to a first plurality of balls includes a) placing the balls between a first body having a first surface and a second body having a second surface, the first surface including a smooth contact portion, the smooth contact portion being substantially flat or convex and having a surface hardness greater than or equal to an initial surface hardness of the balls, b) imparting a compressive stress along a first diameter of the balls by pressing the first body toward the second body or the second body toward the first body or the first and second bodies toward one another with a force, and c) causing relative movement between the first surface and the second surface while maintaining the force at or above a minimum level to impart the compressive stress along other diameters of the balls different than the first diameter.

Method of imparting compressive residual stress to balls

An apparatus for imparting compressive residual stress to at least a surface portion of a first plurality of balls includes a first body having a first surface, the first surface including a smooth contact portion, the smooth contact portion being substantially flat or convex and having a surface hardness greater than or equal to the initial surface hardness of the balls. The apparatus also includes a second body having a second surface, the first surface overlying the second surface, and at least one drive operably connected to the first body or to the second body and configured to move one of the first and second bodies relative to the other body at a substantially fixed distance, the at least one drive also being configured to move the first body toward the second body with a force or to move the second body toward the first body with the force.

Apparatus for producing compressive residual stress in balls

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Jamestown, NY, United States of America

Bryan A McCoy