Grinding Tool

Abstract

A grinding tool includes a substrate having a working surface, and a plurality of abrasive particles distributed across the working surface and protruding outward from the working surface, wherein at least some of the abrasive particles are machined to form abrasive particles respectively having a pyramid shape, the pyramid shape being a right square pyramid or a right hexagonal pyramid.

What is claimed is: 
     
         1 . A grinding tool comprising:
 a substrate having a working surface; and   a plurality of abrasive particles distributed across the working surface and protruding outward from the working surface, wherein at least some of the abrasive particles are machined to form abrasive particles respectively having a pyramid shape, the pyramid shape being a right square pyramid or a right hexagonal pyramid.   
     
     
         2 . The grinding tool according to  claim 1 , wherein the pyramid shape is a right hexagonal pyramid having 8 side faces and an apex, any two opposite ones of the side faces intersecting at the apex defining an angle between about 80 degrees and about 100 degrees. 
     
     
         3 . The grinding tool according to  claim 2 , wherein the angle is equal to about 90 degrees. 
     
     
         4 . The grinding tool according to  claim 1 , wherein the pyramid shape is a right square pyramid having 4 side faces and an apex, any two opposite ones of the side faces intersecting at the apex defining an angle between about 70 degrees and about 90 degrees. 
     
     
         5 . The grinding tool according to  claim 4 , wherein the angle is equal to about 80 degrees. 
     
     
         6 . The grinding tool according to  claim 1 , wherein the abrasive particles are respectively attached to a plurality of support posts, the substrate includes a plurality of holes, and the support posts are respectively attached in the holes so that the abrasive particles protrude outward from the working surface. 
     
     
         7 . The grinding tool according to  claim 6 , wherein the abrasive particles are respectively attached to the support posts by brazing, sintering, or electroplating. 
     
     
         8 . The grinding tool according to  claim 1 , wherein the abrasive particles are made of a high-hardness material including diamond, cubic boron nitride, aluminum oxide or silicon carbide. 
     
     
         9 . The grinding tool according to  claim 1 , wherein the substrate is made of stainless steel, plastics or ceramic.