Method of producing bearings
AssigneeStackpole Limited
InventorsPeter Jones, Keith Buckley-Golder
Life of this patent
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Abstract
A method of producing bearing surfaces from powder metal blanks comprising: blending carbon and ferro alloys and lubricant with compressible elemental iron powder, pressing the blending mixture to form the powder metal blank, high temperature sintering the blank in a reducing atmosphere, compressing the powder metal blanks so as to produce a densified layer having a bearing surface, and then heat treating the densified layer.
Claims15
A method for producing a powder metal article having a bearing surface, said method comprising, in sequence, the steps of:
- a) blending
- carbon;
- at least one ferro alloy powder selected from the group of separate ferro alloy particles of ferro manganese, ferro chromium, ferro molybdenum;
- and
- a lubricant;
- with
- compressible iron powder to form a blended mixture;
- b) pressing said blended mixture to form said article;
- c) sintering said article;
- d) roll forming at least part of a surface of said article with rollers;
- said roll forming step compressing a layer of said article adjacent said surface;
- and
- e) heat treating said layer,
- whereby said roll forming densifies said layer, and said surface, supported by said layer, defined said bearing surface.
A method of producing a bearing surface upon a sintered article, that sintered article comprising by weight percent 0.5 to 2.0% Chromium, 0 to 1.0% Molybdenum, 0 to 0.6% Manganese, 0.1 to 0.6% Carbon, and the balance of iron and trace impurities, said method comprising:
- applying rolling pressure against at least part of a surface of said article to form a densified layer of said article adjacent said surface;
- and thereafter, heat treating said densified layer.
A sintered powder metal article having a bearing surface, that article comprising:
- a composition, by weight percent, of 0.5 to 2.0% Chromium, 0 and 1.0% Molybdenum, 0.1 and 0.6% Carbon, with a balance of iron and trace impurities;
- and
- a roll-formed, cold worked, densified layer adjacent at least part of a surface of said article;
- whereby said at least part of a surface constitutes said bearing surface.
Dependencies are inferred from the claim text.