Roughing-grinding disc

Abstract

A roughing-grinding disc consists of a plurality of part discs, which are flat in design, are located closely against one another, unconnected and uncovered, in an outer working region, are rigidly connected to one another in an inner connecting region located within the working region and are provided with a hub passing through the grinding disc in a centre opening.

1 . A roughing-grinding disc, consisting of a plurality of part discs, which
 are flat in design,   have a common axis,   have outer sides located axially with respect to the common axis,   have a reinforcement on each of said outer sides,   have grinding grain bound with synthetic resin between the reinforcements of each part disc,   have an external diameter D of 100 mm to 300 mm,   are located closely against one another, unconnected and uncovered, in a radially outer working region with respect to the axis,   are rigidly connected to one another in a radially inner connecting region with respect to the common axis located within the outer working region, with a diameter d and in number n to which there applies: 2≦n≦10 and   are provided in a centre opening with a hub passing through the grinding disc.   
     
     
         2 . A roughing-grinding disc according to  claim 1 , wherein the part discs are connected to one another in the inner connecting region by means of an adhesive layer. 
     
     
         3 . A roughing-grinding disc according to  claim 1 , wherein the hub only has one beaded edge on an end face of the roughing-grinding disc. 
     
     
         4 . A roughing-grinding disc according to  claim 1 , wherein the part discs have a thickness b, to which there applies: 0.8 mm≦b≦1.4 mm. 
     
     
         5 . (canceled) 
     
     
         6 . A roughing-grinding disc according to  claim 1 , wherein with regard to the ratio of the diameter d of the inner connecting region to the external diameter D of the part discs there applies: 0.2≦d/D≦0.65. 
     
     
         7 . (canceled) 
     
     
         8 . A roughing-grinding disc according to  claim 1 , wherein the hub is provided with an internal thread for screwing onto an external thread of an output shaft of a grinding machine.