PCD grinding wheel capable of performing positive rake angle processing and provided with ordered micro slot structure and manufacturing method for PCD grinding wheel

Abstract

The invention discloses a PCD grinding wheel capable of performing positive rake angle processing and provided with an ordered micro slot structure and a manufacturing method for the PCD grinding wheel. The PCD grinding wheel is characterized in that a layer of polycrystalline diamond film, namely PCD film is deposited at the outer peripheral surface of a hub of the grinding wheel, wherein a plurality of micro grinding units with positive rake angles and micro slots with high depth-width ratios, which are orderly arranged, are processed in the outer peripheral surface of the whole PCD film. The manufacturing method comprises the following steps of: depositing one layer of PCD film on the outer peripheral surface of the hub of the grinding wheel through hot wire chemical vapor deposition, namely an HFCVD technology; processing a plurality of micro slots with high depth-width ratios, which have axial length equal to the thickness of the grinding wheel, peripheral width being only dozensof microns and depth being hundreds of microns, in the outer peripheral surface of the whole PCD film through a micro water-jet guided laser processing technology, and forming a plurality of micro grinding units with positive rake angles in the outer peripheral surface of the whole PCD film, wherein the micro grinding units and the micro slots are orderly arranged. The grinding wheel disclosed bythe invention can realize positive rake angle processing, remarkably reduces a grinding force ratio, improves grinding performance, further can increase holding force, on the micro grinding units, ofthe grinding wheel, and effectively prolongs the service life of the grinding wheel.

Description

Technical field [0001] The invention relates to a grinding wheel and a preparation method thereof, in particular to a PCD grinding wheel with an ordered micro-groove structure capable of processing a positive rake angle and a preparation method thereof. Background technique [0002] As a precision processing technology, grinding has the characteristics of high processing accuracy and good surface quality, and has a wide range of applications in the field of precision processing and manufacturing. However, in the traditional grinding process, the abrasive grains are arranged irregularly on the working surface of the grinding wheel, and the geometric shape and size of the abrasive grains are not consistent. Therefore, the abrasive grains often appear large negative in the grinding process. When the rake angle cuts the surface of the workpiece, this will increase the grinding force ratio, accelerate the conversion of grinding energy into grinding heat, and increase the grinding temp...

AI Technical Summary

Problems solved by technology

However, in the process of laser processing of large-grain diamond abrasive grains, excessive laser ablation temperature will inevitably lead to partial graphitization of large-grain diamond abrasive grains, which will affect the cutting of the workpiece surface by the abrasive grains at a positive rake angle and reduce the processing surface. At the same time, once a single large diamond abrasive grain is subjected to excessive force or concentrated force, the whole grain may fall off, affecting the grinding efficiency and even reducing the service life of the grinding wheel

[0005] In order to further improve the quality of the processed surface and improve the grinding efficiency, the patent of publication number CN107243848A "A helically arranged fiber cutter capable of positive rake angle processing and its preparation method" is prepared on the wheel hub of the grinding wheel by pressing and sintering out of the carcass and use a drill to process small holes arranged in an orderly manner on the carcass, and then the positive rake fiber is consolidated in the small hole by epoxy resin, thus realizing the positive rake cutting process and further improving the processing The surface quality improves the machining accuracy; however, because the cross-sectional size of the fiber is as high as 0.8mm to 0.8mm, the number of fibers per square centimeter on the surface of the tool is only 14.26, so that the cutting depth of a single fiber is very large, and it is difficult to ensure the machining accuracy, and Once a single fiber is subjected to excessive force or concentrated force, it will inevitably break, which will affect the service life of the grinding wheel. At the same time, the difficulty of inserting all the fibers into the small holes one by one and consolidating the preparation process cannot be ignored.

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