Supporting body for a grinding tool and method of producing a supporting body

Abstract

A supporting body for a grinding tool, the supporting body including an abrasive pad having a preferably circumferential supporting surface for an abrasive material, particularly a superabrasive material. The supporting body consisting substantially of a composite material which is free of abrasive material and consists of a plurality of layers of a natural fiber material which are arranged one atop the other and are connected to each other by plastic, preferably phenolic resin. The natural fiber material preferably is a cotton fabric or paper, and the supporting body includes a first, preferably cylindrical or hollow cylindrical body and at least one additional, preferably cylindrical or hollow cylindrical body, in which the bodies are connected, preferably adhesively bonded, to each other.

1 . A support body for a grinding tool which includes a preferably circumferential support surface for an abrasive layer having abrasive means, in particular superabrasive means, wherein the support body substantially comprises an abrasive means-free composite material comprising a plurality of mutually superposed layers of a natural fibre material which are connected together by plastic, preferably phenolic resin, preferably wherein the natural fibre material is a cotton fabric or paper, wherein the support body has a first, preferably cylindrical or hollow-cylindrical body and at least one further, preferably cylindrical or hollow-cylindrical body, wherein the bodies are connected together, preferably adhesively bonded. 
     
     
         2 . The support body according to  claim 1 , wherein the composite material is of a density of 1.0 to 2.0 g/cm 3 , preferably 1.4 g/cm 3  and/or has a water absorption of 1.5 to 7.5%, preferably 2.4% or 5.2%. 
     
     
         3 . The support body according to  claim 1 , wherein the composite material has a length extension coefficient of 20 to 40×10 −6  K −1 , preferably 30×10 −6  K −1  and/or thermal conductivity of 0.1 to 0.3 W/mK, preferably 0.2 W/mK. 
     
     
         4 . The support body according to  claim 1 , wherein the composite material has a compressive strength at 23° C. of 200 to 400 N/mm 2 , preferably 300 N/mm 2  or 320 N/mm 2  and/or a flexural strength at 23° C. of 50 to 150 N/mm 2 , preferably 100 N/mm 2  or 135 N/mm 2  and/or a modulus of elasticity of 6000 to 8000 N/mm 2 , preferably 7000 N/mm 2  and/or a tensile strength of 50 to 150 N/mm 2 , preferably 80 N/mm 2  or 120 N/mm 2  and/or a splitting force of 1500 to 3500 N, preferably 1900 N or 3000 N. 
     
     
         5 . The support body according to  claim 1 , wherein the support body has at least one side surface which is separate from the support surface for the abrasive layer and at which a layer of the natural fibre material is arranged flat. 
     
     
         6 . The support body according to  claim 1 , wherein the support body has a central coupling region, preferably with a central bore, for connection to a rotary drive for rotating the support body or a grinding tool formed therewith about an axis of rotation extending through the coupling region and/or the support body is of a substantially rotationally symmetrical configuration. 
     
     
         7 . The support body according to  claim 1 , wherein the first and the at least one further body are cylindrical or hollow-cylindrical bodies which are connected together at side surfaces, preferably wherein axes of symmetry of the bodies are substantially congruent. 
     
     
         8 . The support body according to  claim 1 , wherein the support body has an adaptor for connecting the support body or a grinding tool formed therewith to a rotary drive connected, preferably glued to at least one of the bodies, preferably wherein the adaptor substantially comprises a metal and/or is of a substantially hollow-cylindrical configuration. 
     
     
         9 . The support body according to  claim 8 , wherein the support body has a central bore and the adaptor is at least region-wise arranged in the central bore, preferably wherein the adaptor extends only over a part of the length of the central bore, particularly preferably wherein the central bore has a funnel-shaped insertion opening. 
     
     
         10 . A grinding tool having the support body according to  claim 1  and an abrasive layer which has abrasive means, in particular superabrasive means, and which is arranged on the preferably circumferential support surface of the support body, preferably wherein the abrasive layer is formed from a continuous abrasive ring or individual abrasive segments. 
     
     
         11 . A method of producing a support body for a grinding tool, wherein the support body includes a preferably circumferential support surface for an abrasive layer having abrasive means, in particular superabrasive means, and substantially comprises an abrasive means-free composite material comprising a plurality of mutually superposed layers of a natural fibre material, which are connected together by plastic, preferably phenolic resin, wherein the natural fibre material is a cotton fabric or paper, wherein the abrasive means-free composite material is provided in the form of a plate in a first method step and in a second method step a preferably cylindrical or hollow-cylindrical body is cut out of the plate with predetermined dimensions preferably by water jet cutting or by means of a band saw. 
     
     
         12 . The method according to  claim 11 , wherein, in the course of the second method step, at least one further, preferably cylindrical or hollow-cylindrical body is cut out of the plate with predetermined dimensions and connected to the first body, preferably by adhesive. 
     
     
         13 . The method according to  claim 12 , wherein the first and the at least one further body is cylindrical or hollow-cylindrical bodies, the bodies being connected together at side surfaces, preferably wherein axes of symmetry of the bodies are brought substantially into congruent relationship. 
     
     
         14 . The method according to  claim 11 , wherein in a third method step the body or bodies is or are re-worked, preferably by cutting machining and/or balancing and/or by fitting a central bore. 
     
     
         15 . The method according to  claim 11 , wherein at least one of the bodies in a further method step which follows the second method step or the third method step is connected to an adaptor for connecting the support body or a grinding tool formed therewith to a rotary drive, preferably by adhesive, preferably wherein the adaptor substantially comprises a metal and/or is of a substantially hollow-cylindrical configuration. 
     
     
         16 . A method of producing a grinding tool having a support body which includes a preferably circumferential support surface for an abrasive layer having abrasive means, in particular superabrasive means, and substantially comprises an abrasive means-free composite material comprising a plurality of mutually superposed layers of a natural fibre material, which are connected together by plastic, preferably phenolic resin, preferably wherein the natural fibre material is a cotton fabric or paper, and an abrasive layer which has abrasive means, in particular superabrasive means and which is arranged on the preferably circumferential support surface of the support body, preferably wherein the abrasive layer is formed from a continuous abrasive ring or individual abrasive segments, wherein firstly a support body produced by the method according to  claim 11  is provided and then an abrasive layer having abrasive means, preferably superabrasive means, is arranged on a preferably circumferential support surface of the support body, preferably by pressing thereon and/or adhesive bonding, preferably wherein the abrasive layer is formed from a continuous abrasive ring or individual abrasive segments.