Abrasive tools for grinding and polishing concrete surfaces

Abstract

An abrasive tool (200) for a floor grinder, the abrasive tool (200) comprising an attachment plate (230) arranged to releasably attach to a tool holder of the floor grinder, the abrasive tool (200) also comprising an abrasive tool section (220) at least partly formed in an abrasive material, wherein the attachment plate (230) comprises a supporting surface (235) at least partly formed in a plastic material, wherein the supporting surface (235) is configured to align with a corresponding surface (510) on the abrasive tool section (220), wherein the attachment plate (230) and the abrasive tool section (220) are held together by one or more welds.

1 . An abrasive tool for a floor grinder,
 the abrasive tool comprising an attachment plate arranged to releasably attach to a tool holder of the floor grinder,   the abrasive tool also comprising an abrasive tool section at least partly formed in an abrasive material,   wherein the attachment plate comprises a supporting surface at least partly formed in a plastic material, wherein the supporting surface is configured to align with a corresponding surface on the abrasive tool section, and   wherein the attachment plate and the abrasive tool section are held together by one or more welds.   
     
     
         2 . The abrasive tool according to  claim 1 , wherein the one or more welds comprises any of an ultrasonic weld, a laser weld, a vibration weld, or a melted plastic material weld. 
     
     
         3 . The abrasive tool according to any previous  claim 1 , wherein a plurality of protrusions extends from the supporting surface of the attachment plate along a normal vector of the supporting surface. 
     
     
         4 . The abrasive tool according to any previous  claim 1 , wherein the attachment plate comprises a rim portion extending along a perimeter of the supporting surface, wherein the rim portion is arranged to hold the abrasive tool section laterally with respect to the normal vector of the supporting surface. 
     
     
         5 . The abrasive tool according to any previous  claim 1 , wherein the abrasive tool section comprises a planar support element and a plurality of abrasive elements arranged protruding from the planar support element in a direction normal to the supporting surface. 
     
     
         6 . The abrasive tool according to  claim 1 , wherein the abrasive tool section comprises an abrasive material embedded in an at least partly plastic material. 
     
     
         7 . The abrasive tool according to  claim 6 , wherein the plastic material is phenolic novolac. 
     
     
         8 . The abrasive tool according to  claim 1 , wherein the abrasive tool section comprises any of: talc, rubber, silicon carbide, green chromium oxide and diamond granules. 
     
     
         9 . The abrasive tool according to  claim 1 , wherein the abrasive tool section is associated with a grit between 30-200 and wherein the abrasive tool section comprises a relative volume percentage of silicon carbide between 10-20%. 
     
     
         10 . The abrasive tool according to  claim 1 , wherein the abrasive tool section is associated with a grit between 30-200 and wherein the abrasive tool section comprises a relative volume percentage of talc between 5-15%. 
     
     
         11 . The abrasive tool according to  claim 1 , further comprising a cage part, wherein the cage part comprises apertures arranged to receive abrasive elements extending from a planar support element of the abrasive tool section. 
     
     
         12 . The abrasive tool according to  claim 11 , wherein the cage part is at least partly formed in a plastic material and where the cage part is welded to the attachment plate and/or to the abrasive tool section, thereby holding the attachment plate and the abrasive tool section together by the one or more welds. 
     
     
         13 . The abrasive tool according to  claim 11 , wherein the cage part comprises one or more ridges arranged facing in a direction of the attachment plate, wherein the ridges are configured to facilitate ultrasonic welding of the cage part to the attachment plate and/or to the abrasive tool section. 
     
     
         14 . The abrasive tool according to  claim 11 , wherein the cage part comprises at least two apertures, wherein each aperture of the at least two apertures is configured to receive one abrasive element arranged protruding from a planar support element on the abrasive tool section. 
     
     
         15 . The abrasive tool according to  claim 11 , wherein the apertures constitute at least half of a total surface area of the cage part, or wherein one of the apertures is substantially polygon shaped with at least three sides. 
     
     
         16 . (canceled) 
     
     
         17 . The abrasive tool according to  claim 11 , wherein the cage part comprises a centrally positioned solid portion. 
     
     
         18 . The abrasive tool according to  claim 1 , wherein the attachment plate comprises two opposing and angled wings for releasably mounting the attachment plate to a tool holder of the floor grinder. 
     
     
         19 . A set of tools for injection molding of the attachment plate, the abrasive tool section and the cage part according to  claim 11 . 
     
     
         20 . A method for producing an abrasive tool, the method comprising forming at least an attachment plate and an abrasive tool section, wherein the attachment plate is at least partly formed in a plastic material, the method also comprises assembling the attachment plate and the abrasive tool section, by attaching the components in fixed relation to each other by means of one or more welds. 
     
     
         21 . The method according to  claim 20 , also comprising forming a cage part and assembling the cage part with the attachment plate and the abrasive tool section.