Methods for manufacturing multi-layer engine valve guides by thermal spray

The present invention relates to a method of making valve guides by thermal spray on a cylindrical substrate. A method of making valve guides by thermal spraying a wear-resistant layer onto a rotating mandrel that is subsequently built up by thermal spraying steel on the wear-resistant layer. A flam...

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Bibliographic Details
Main Authors Van Reatherford, Larry, Popoola, Oludele Olusegun, McCune, Robert Corbly
Format Patent
LanguageEnglish
Published 12.02.2002
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Summary:The present invention relates to a method of making valve guides by thermal spray on a cylindrical substrate. A method of making valve guides by thermal spraying a wear-resistant layer onto a rotating mandrel that is subsequently built up by thermal spraying steel on the wear-resistant layer. A flame spray polymer lubricant may be applied to the wear-resistant layer to improve self-lubricating properties of the engine valve guide. The mandrel and applied layers are then cut off and the remaining segment is further processed in a machining operation to remove the mandrel from the inside of the engine valve guide. The mandrel is preferably cooled as the thermal spray is applied preferably by routing a cooling fluid such as air through the mandrel.