Orderly-micro-grooved pcd grinding wheel and method for making same

Abstract

An orderly-micro-grooved PCD grinding wheel includes a wheel hub, a polycrystalline diamond (PCD) film, a number of micro-grinding units and a number of microgrooves. The PCD film is deposited on an outer circumferential surface of the wheel hub. The PCD film is processed by a water-jet guided laser device to form the microgrooves with high depth-width ratio and micro-grinding units with positive rake angles on the entire outer circumferential surface of the PCD film. An axial length of each micro-grinding unit and an axial length of each microgroove are equal to a thickness of the grinding wheel, respectively. The microgrooves are spaced apart by the micro-grinding units.

What is claimed is: 
     
         1 . A grinding wheel, comprising:
 a wheel hub;   a polycrystalline diamond (PCD) film;   a plurality of micro-grinding units; and   a plurality of microgrooves;   wherein an outer circumferential surface of the wheel hub is deposited with the PCD film; the plurality of micro-grinding units and the plurality of microgrooves are orderly distributed on a whole outer circumferential surface of the PCD film; the plurality of micro-grinding units form a part of the PCD film; and the plurality of microgrooves are spaced apart by the plurality of micro-grinding units;   each of the plurality of microgrooves and each of the plurality of micro-grinding units both have an axial length equal to a thickness of the grinding wheel;   the micro-grinding units each comprise two side surfaces and an outer surface; the microgrooves each comprise two side walls that form one of the two side surfaces of two adjacent micro-grinding units, respectively; and   the micro-grinding units each have a rake angle that is positive.   
     
     
         2 . The grinding wheel of  claim 1 , wherein the rake angle is 10°-40°. 
     
     
         3 . The grinding wheel of  claim 1 , wherein the micro-grinding units each have a clearance angle of 20°-50°. 
     
     
         4 . The grinding wheel of  claim 1 , wherein the micro-grinding units have substantially the same geometric shapes and dimensions. 
     
     
         5 . The grinding wheel of  claim 1 , wherein a thickness of the PCD film is 1-2 mm. 
     
     
         6 . The grinding wheel of  claim 1 , wherein each of the micro-grinding units has a circumferential width of 80-150 μm and a radial height of 500-800 μm 
     
     
         7 . The grinding wheel of  claim 1 , wherein each of the microgrooves has a circumferential width of 20-50 μm, a depth of 500-800 μm and a depth-width ratio of 10-40:1. 
     
     
         8 . The grinding wheel of  claim 1 , wherein the wheel hub is made of titanium alloy. 
     
     
         9 . The grinding wheel of  claim 8 , wherein the wheel hub has a diameter of 100-200 mm and a thickness of 6-20 mm.