Honing bar, method of producing a honing bar and honing tool

Abstract

A honing strip for use in a honing tool for machining an inner surface of a bore includes a cutting layer carrier that carries, on an outer side, a cutting layer including cutting grains bound within a bond and an abrasive working surface that engages on the inner surface of the bore, wherein the honing strip defines a longitudinal direction (L) to be oriented parallel to a bore axis and the working surface extends in a width direction (B), perpendicular to the longitu-dinal direction, between a first side surface and a second side surface of the cutting layer, and the working surface has a generally convex macroscopic form with at least two macroscopically planar facets of different orientation which transition, along edges running in the longitudinal direction, to an adjacent facet or a side surface.

1 .- 12 . (canceled) 
     
     
         13 . A honing strip for use in a honing tool for machining an inner surface of a bore, comprising:
 a cutting layer carrier that carries, on an outer side, a cutting layer comprising cutting grains bound within a bond and an abrasive working surface that engages on the inner surface of the bore,   wherein the honing strip defines a longitudinal direction (L) to be oriented parallel to a bore axis and the working surface extends in a width direction (B), perpendicular to the longitudinal direction, between a first side surface and a second side surface of the cutting layer, and   the working surface has a generally convex macroscopic form with at least two macroscopically planar facets of different orientation which transition, along edges running in the longitudinal direction, to an adjacent facet or a side surface.   
     
     
         14 . The honing strip as claimed in  claim 13 , wherein adjacent facets form, at the enclosed edge, an interior angle of less than 180°. 
     
     
         15 . The honing strip as claimed in  claim 13 , wherein the working surface comprises exactly three facets. 
     
     
         16 . The honing strip as claimed in  claim 13 , wherein the facets have substantially identical widths. 
     
     
         17 . The honing strip as claimed in  claim 13 , wherein the facets are dimensioned such that the edges at the side surfaces and the at least one edge between facets lie on a common cylinder surface (Z) having a radius of curvature corresponding substantially to a nominal radius of the bore. 
     
     
         18 . The honing strip as claimed in  claim 13 , wherein, on the working surface, the bond is reset in relation to exposed parts of the cutting grains such that there is a grain protrusion. 
     
     
         19 . The honing strip as claimed in  claim 13 , wherein the cutting layer contains diamond cutting grains in a metallic bond. 
     
     
         20 . A method of producing a honing strip for use in a honing tool for machining an inner surface of a bore, comprising:
 providing a honing strip blank comprising a cutting layer carrier that carries, on an outer side, a cutting layer comprising cutting grains bound within a bond;   generating an abrasive working surface on the cutting layer, said working surface adapted to engage on the inner surface of the bore, wherein the working surface defines a longitudinal direction (L) to be oriented parallel to a bore axis and extends in a width direction (B), perpendicular to the longitudinal direction, between a first side surface and a second side surface of the cutting layer, and   the working surface is generated such that it obtains a generally convex form with at least two facets which transition, along edges running in the longitudinal direction, to an adjacent facet or a side surface.   
     
     
         21 . The method as claimed in  claim 20 , wherein, proceeding from a raw state of the cutting layer, some or all of the facets are generated by removal of material. 
     
     
         22 . The method as claimed in  claim 21 , wherein the facets on the cutting layer of the honing strip blank are generated by surface grinding, and a surface grinding tool with diamond cutting grains is used. 
     
     
         23 . The method as claimed in  claim 20 , wherein, by a resetting of the bond on the facets of the working surface, and, during generation of the facets, in a first step, substantially planar facets without grain protrusion are generated, and then, in a second step, the bond on the facets is reset in a resetting operation, and, during the resetting operation, a surface grinding tool comprising a cutting layer whose cutting grains are harder than the bond of the cutting layer of the honing strip but are unable to cut the cutting grains of the cutting layer of the honing strip is used. 
     
     
         24 . A honing tool for machining the inner surface of a bore, comprising:
 a tool body that defines a tool axis about which the honing tool rotates during the honing machining;   at least one honing strip arranged on the tool body, said honing strip adapted to be fed radially with respect to the tool axis and comprising, on an outer side, a cutting layer comprising cutting grains bound within a bond and an abrasive working surface that engages on the inner surface of the bore,   wherein the honing strip is configured as claimed in  claim 13 .