Orderly-micro-grooved pcd grinding wheel for positive rake angle processing and method for making same

Abstract

Disclosed are an orderly-micro-grooved PCD grinding wheel for positive rake angle processing and a preparation method thereof. A PCD film is deposited on the outer circumferential surface of a wheel hub, and a plurality of microgrooves with high depth-width ratio and micro-grinding units with positive rake angles are orderly provided on the outer circumferential surface of the entire PCD film. The method includes: depositing the PCD film on the outer circumferential surface of the wheel hub by a HFCVD technique; and manufacturing a plurality of microgrooves with a high depth-width ratio (circumferential width: dozens of micrometers; depth: hundreds of micrometers) and an axial length that is equal to the thickness of the grinding wheel and a plurality of micro-grinding units with positive rake angles on the outer circumferential surface of the entire PCD film by water-jet guided laser technique, where the micro-grinding units and the microgrooves are orderly arranged.

What is claimed is: 
     
         1 . An orderly-micro-grooved PCD grinding wheel for positive rake angle processing, comprising:
 a wheel hub;   a PCD film;   a plurality of micro-grinding units with a positive rake angle; and   a plurality of microgrooves;   wherein the PCD film with a thickness of 1-2 mm is deposited on an outer circumferential surface of the wheel hub; the microgrooves are provided on an outer circumferential surface of the PCD film, wherein each of the microgrooves has an axial length that is equal to a thickness of the grinding wheel, a circumferential width of 20-50 μm, a depth of 500-800 μm and a depth-width ratio of 10-40:1; respective micro-grinding units with the positive rake angle are provided between two adjacent microgrooves, and the microgrooves and the micro-grinding units are respectively arranged in an ordered manner;   when the grinding wheel is configured to grind a workpiece, respective micro-grinding units are in contact with the workpiece in the positive rake angle to achieve positive rake angle processing; and the microgrooves are mainly configured to hold chips and store a liquid.   
     
     
         2 . The PCD grinding wheel of  claim 1 , wherein the wheel hub is made of titanium alloy, and has a diameter of 100-200 mm and a thickness of 6-20 mm. 
     
     
         3 . The PCD grinding wheel of  claim 1 , wherein respective micro-grinding units have an axial length that is equal to the thickness of the grinding wheel, a circumferential width of 80-150 μm, a radial height of 500-800 μm and a circumferential spacing of 100-200 μm. 
     
     
         4 . A method of manufacturing the PCD grinding wheel of  claim 1 , comprising:
 1) depositing the PCD film with a thickness of 1-2 mm on the outer circumferential surface of the wheel hub by a HFCVD technique;   2) polishing the outer circumferential surface of the PCD film by ion beam polishing to obtain a surface roughness of the PCD film of 0.15-0.2 μm;   3) processing the outer circumferential surface of the PCD film by water-jet guided laser preparation technology: and focusing a laser beam emitted by a laser head in a nozzle through a glass window on a water chamber; pressurizing the water chamber to allow a water jet to be ejected from the nozzle and to guide the transmission of the laser beam to the outer circumferential surface of the PCD film; offsetting the grinding wheel by a certain angle, and producing one microgroove with an axial length that is equal to the thickness of the grinding wheel, a circumferential width of 20-50 μm, a depth of 500-800 μm and a depth-width ratio of 10-40:1 according to a relative movement orbit of the water jet and the wheel hub; indexing the grinding wheel, and rotating an outer circumference of the PCD film through a circumferential width of one micro-grinding unit to carry out the processing of the next microgroove, wherein the micro-grinding unit with a positive rake angle is formed between the two microgrooves; and processing the micro-grinding unit to form a clearance angle;   4) repeating step (3) to form a plurality of microgrooves with high depth-width ratio and a plurality of ordered micro-grinding units with the positive rake angle at the entire circumference of the PCD film; wherein respective micro-grinding units are the same in size; and   5) subjecting the product prepared in step (4) to pickling and then ultrasonic cleaning in deionized water to produce the orderly-micro-grooved PCD grinding wheel for positive rake angle processing.   
     
     
         5 . The method of  claim 4 , wherein the wheel hub is made of titanium alloy, and has a diameter of 100-200 mm and a thickness of 6-20 mm. 
     
     
         6 . The method of  claim 4 , wherein respective micro-grinding units have an axial length that is equal to the thickness of the grinding wheel, a circumferential width of 80-150 μm, a radial height of 500-800 μm and a circumferential spacing of 100-200 μm. 
     
     
         7 . The method of  claim 4 , wherein in step (3), the micro-grinding units formed by processing the PCD film with the laser beam have the positive rake angle of 10°-40° and the clearance angle of 20°-50°. 
     
     
         8 . The method of  claim 4 , wherein in step (3), a laser device used in the water-jet guided laser technique is an Nd:YAG pulse laser, and the Nd:YAG pulse laser has a wavelength of 532 nm and a focused spot diameter of 30-100 μm. 
     
     
         9 . The method of  claim 4 , wherein in step (3), a pressure of the water chamber used in the water-jet guided laser technique is 2-4 MPa, and a diameter of the water jet is 20-50 μm.