Anti-galling method for treating materials

Abstract

An anti-galling method for treating materials, which provides for subjecting at least one of the at least two components mutually coupled with at least one degree of freedom, made of metallic material, to a first preliminary step of thermal treatments to increase surface hardness and to a second preliminary step of surface grinding. The method further includes the steps of: washing at least one portion of the surface of the at least one component subjected previously to the preliminary steps; shot peening the at least one portion of the surface of the at least one component previously subjected to washing; and applying a layer of molybdenum disulfide to the at least one portion of the at least one component previously subjected to shot peening.

1 .- 10 . (canceled) 
     
     
         11 . An anti-galling method for treating materials, which provides for subjecting at least one of the at least two components mutually coupled with at least one degree of freedom, made of metallic material, to a first preliminary step of thermal treatments to increase surface hardness and to a second preliminary step of surface grinding, which includes the following steps:
 performing a first step of washing at least one portion of a surface of the at least one component subjected previously to the first and second preliminary steps;   performing a second step of shot peening said at least one portion of the surface of the at least one component previously subjected to washing; and   performing a third step of applying a layer of molybdenum disulfide to said at least one portion of the at least one component previously subjected to shot peening.   
     
     
         12 . The anti-galling method according to  claim 11 , wherein said first washing step also comprises surface degreasing of the at least one portion of the surface of the at least one component subjected previously to the preliminary steps. 
     
     
         13 . The anti-galling method according to  claim 11 , wherein said second step of shot peening said at least one portion of the surface of the at least one component previously subjected to washing is prolonged until a state of residual compression with a value comprised between 200 MPa and 10000 MPa is obtained in said at least one portion. 
     
     
         14 . The anti-galling method according to  claim 11 , wherein said second step of shot peening said at least one portion of the surface of the at least one component previously subjected to washing is performed with S 110  steel balls with a diameter comprised between 0.01 mm and 1.5 mm. 
     
     
         15 . The anti-galling method according to  claim 11 , wherein said second step of shot peening said at least one portion of the surface of the at least one component previously subjected to washing is performed with an intensity whose value is comprised between 4 and 20 Almen degrees referred to a type A test piece. 
     
     
         16 . The anti-galling method according to  claim 11 , wherein said second step of shot peening said at least one portion of the surface of the at least one component previously subjected to washing is performed with a coverage of more than 60% of said at least one portion. 
     
     
         17 . The anti-galling method according to  claim 11 , wherein said third step of application of a layer of molybdenum disulfide on said at least one portion of the least one component provides for the creation of a layer with a thickness comprised between 1 and 50 μm. 
     
     
         18 . The anti-galling method according to  claim 11 , wherein said third step of application of a layer of molybdenum disulfide on said at least one portion of the at least one component provides for the aspersion, on said at least one portion, of an aerosol comprising molybdenum disulfide in a percentage by weight of more than 10%, inorganic resins, solvents and propellants. 
     
     
         19 . The anti-galling method according to  claim 11 , wherein an auxiliary step of removing material in the other one of the two mutually coupled components to increase the play between them, said removal of material taking place in at least one region of said other component that does not face and lie proximate to said at least one portion subjected to the first to third steps. 
     
     
         20 . The anti-galling method according to  claim 11 , wherein a first component is a pivot and a second component is a bushing, said pivot, in the configuration for use, being inserted rotatably within said bushing and defining a sliding of its at least one portion, subjected to the first to third steps, on corresponding areas of an internal surface of said bushing.