Blow molding process for manufacturing grinding wheels

Abstract

A composition for filling a mold with abrasive grits and bond making use of resin bond particles and abrasive grains of approximately the same size intimately mixed together for use in a blow molding procedure.

What is claimed is: 
     
       1. A method for manufacturing grinding wheels characterized in that a granulated mixture containing at least abrasive grains and bond .[.grains.]. within a hopper is introduced into a cavity of a closed mold by blowing with a compressed gas, said mixture having a relatively uniform distribution of grain sizes proportioned within a formula where D is the mean diameter of the grains in the mixture, at least 90% of the grains have a diameter between 0.5 D and 2D, 2% at most have a diameter less than 0.1 D and the remainder a diameter falling in a range between 0.1 D and 0.5 D whereby a homogeneous mass is obtained when said mixture is poured into the hopper and is blown into the cavity of the mold, then compressing and reducing the volume of said mixture in the cavity of the mold to form a grinding wheel of the desired size, and heating the grinding wheel sufficiently to cure the bond. 
     
     
       2. A method according to claim 1, characterized in that it is applied to the manufacture of organic resin and vitrified grinding wheels. 
     
     
       3. A method according to claim 2, characterized in that blowing is carried out through the bore in the center of the grinding wheel.