Abstract: A rotary positive displacement pump (1) comprises a pump enclosure (10) and at least one rotating member (20). The pump enclosure (10) has an inlet (12) and an outlet (14). The rotating member (20) is arranged for, when being rotated, causing a transfer of a liquid from the inlet (12) to the outlet (14). The rotary positive displacement pump (1) has internal sliding surfaces (16, 24, 26, 32, 34) that during operation are exposed to the liquid and are exposed to a sliding contact relative to other internal sliding surfaces (16, 24, 26, 32, 34) of the rotary positive displacement pump (1). At least a part of the internal sliding surfaces (16, 24, 26, 32, 34) has a surface region composed by a nitrided or nitrocarburized steel intercalated with a solid lubricant. A method for manufacturing a rotary positive displacement pump is also disclosed.

Abstract: A method for manufacturing of steel articles comprises nitriding (210) a steel article at a nitrification temperature in the interval 350-650° C., giving a nitrided steel article. The nitrided steel article is quenched (220) in a reactive quenching oil from the nitrification temperature. The reactive quenching oil comprises at least one of S, P, B, Mo and W. Thereby, the quenching additionally comprises coating (222) of the nitrided steel article by a solid lubricant comprising at least one of S, P, B, Mo and W. An apparatus for manufacturing of steel articles, a quenching oil and a steel article produced by the method are also disclosed.

Abstract: A method for manufacturing of steel articles comprises nitriding (210) a steel article at a nitrification temperature in the interval 350-650° C., giving a nitrided steel article. The nitrided steel article is quenched (220) in a reactive quenching oil from the nitrification temperature. The reactive quenching oil comprises at least one of S, P, B, Mo and W. Thereby, the quenching additionally comprises coating (222) of the nitrided steel article by a solid lubricant comprising at least one of S, P, B, Mo and W. An apparatus for manufacturing of steel articles, a quenching oil and a steel article produced by the method are also disclosed.

Abstract: The present invention relates to a method for the lining of a thin-walled sliding element (20) for internal combustion engine blocks ion which: (i) the pressure applied for honing the sliding element (20) is between 8 MPa and 9 MPa; and (ii) at least a part of the inner surface (21) of the sliding element (20) comprises a nano-coat of solid lubricant provided with roughnesses, before honing, of Rpk, Rk and Rvk no lower than ? of the original.

Abstract: A tool (1) for mechanochemical treatment comprises a shaft (10), a number n of working ledges (20), n?1, and a force application arrangement (2). The force application arrangement (2) is configured for applying a working force (F) on the working ledges (20). The working ledges (20) comprises wear-resistant material with a Vickers number above 800 HV and a Young modulus above 200 GPa. Each working ledge (20) has a contact surface (22) facing away from a main axis (11) and having a surface roughness Ra below I ?m. The contact surface (22) has a convex curvature which has a radius of curvature that is at most equal to a closest distance from that point to the main axis. A width of the contact surface (22) is less than r/2n. The working force applied on each working ledge (20) is at least P?L?r/2n, where P=107 Pa and L is the contact surface length.

Abstract: A tool (1) for mechanochemical treatment comprises a shaft (10), a number n of working ledges (20), n?1, and a force application arrangement (2). The force application arrangement (2) is configured for applying a working force (F) on the working ledges (20). The working ledges (20) comprises wear-resistant material with a Vickers number above 800 HV and a Young modulus above 200 GPa. Each working ledge (20) has a contact surface (22) facing away from a main axis (11) and having a surface roughness Ra below I ?m. The contact surface (22) has a convex curvature which has a radius of curvature that is at most equal to a closest distance from that point to the main axis. A width of the contact surface (22) is less than r/2n. The working force applied on each working ledge (20) is at least P?L?r/2n, where P=107 Pa and L is the contact surface length.

Abstract: The present invention relates to a method for the lining of a thin-walled sliding element (20) for internal combustion engine blocks ion which: (i) the pressure applied for honing the sliding element (20) is between 8 MPa and 9 MPa; and (ii) at least a part of the inner surface (21) of the sliding element (20) comprises a nano-coat of solid lubricant provided with roughnesses, before honing, of Rpk, Rk and Rvk no lower than ? of the original.

Abstract: A manufacturing method for providing a low-friction surface comprises providing (210) of a mechanical element. A tool is mechanically rubbed (212) against a surface of the mechanical element. A process liquid is provided (214) to a contact area between the mechanical element and the tool. The process liquid comprises a first element that is a refractory metal and a second element that is a chalcogen. The first and second elements are provided in a liquid substance. The mechanical rubbing is performed with a contact pressure that is between 1% and 100% of an ultimate strength of the mechanical element. The mechanical rubbing thereby causes a combined burnishing of the surface of the mechanical element and a deposition of a tribofilm on the surface of the mechanical element. The tribofilm comprises the first element and the second element.

Abstract: A manufacturing method for providing a low-friction surface comprises providing (210) of a mechanical element. A tool is mechanically rubbed (212) against a surface of the mechanical element. A process liquid is provided (214) to a contact area between the mechanical element and the tool. The process liquid comprises a first element that is a refractory metal and a second element that is a chalcogen. The first and second elements are provided in a liquid substance. The mechanical rubbing is performed with a contact pressure that is between 1% and 100% of an ultimate strength of the mechanical element. The mechanical rubbing thereby causes a combined burnishing of the surface of the mechanical element and a deposition of a tribofilm on the surface of the mechanical element. The tribofilm comprises the first element and the second element.