Grinding wheel for longitudinal or transverse grinding

Abstract

A grinding wheel has an inner core part and an outer annular grinding part connected the inner core part. The outer grinding part is made of a granular abrasive medium and plastic or glass fibers. The fibers form between 0.15% and 1%, preferably 0.2% to 0.4%, by weight of the grinding part.

We claim: 
     
         1 . A grinding wheel comprising:
 an inner core part; and   an outer annular grinding part connected the inner core part and comprised of a granular abrasive medium and plastic or glass fibers, the fibers forming between 0.15% and 1% by weight of the grinding part.   
     
     
         2 . The grinding wheel defined in  claim 1 , wherein the fibers form between 0.2% and 0.4% by weight of the grinding part. 
     
     
         3 . The grinding wheel defined in  claim 1 , wherein the fibers have a length of between 5 mm and 15 mm and a thickness between 0.8 mm and 1.2 mm. 
     
     
         4 . The grinding wheel defined in  claim 1 , wherein the core part has a substantially cylindrical outer peripheral surface formed with indentations and the outer grinding part has a substantially cylindrical inner peripheral surface engaging the outer surface and formed with projections complementary to and engaging into the indentations of the outer surface, whereby relative shifting of the parts at the surfaces is inhibited by inherit of the indentations and projections. 
     
     
         5 . The grinding wheel defined in  claim 1  wherein the grinding wheel is made of particles of Al 2 O 3 , SiC, CBN, ZrO 2 , diamond or mixtures thereof. 
     
     
         6 . The grinding wheel defined in  claim 5 , wherein the particles have particle sizes of a maximum diameter of 1 mm. 
     
     
         7 . The grinding wheel defined in  claim 1  wherein the core part and grinding part have thermal coefficients of expansion that deviate from each other by less than 5%. 
     
     
         8 . The grinding wheel defined in  claim 1 , wherein the grinding part has a matrix of a metal or metal alloy or of a thermally curable resin in which is embedded granules of abrasive media and the glass fibers in a generally homogenous distribution. 
     
     
         9 . The grinding wheel defined in  claim 8 , wherein the core part is substantially made of a metal or metals and filler materials. 
     
     
         10 . The grinding wheel defined in  claim 1 , wherein at least one of the parts contains a thermally curable resin and cross-linking agents and fillers. 
     
     
         11 . The grinding wheel defined in  claim 11 , wherein the fillers are as SiC, Al2O3, bauxite, graphite or molybdenum sulfide. 
     
     
         12 . The grinding wheel defined in  claim 1  wherein first the core part, then the grinding part are compacted by cold shaping to form a combined green compact that is heated to 180° C. to 200° C. and compacted to desired dimensions.