Porous self-sharpening brazing diamond grinding wheel preparation and abrasive particle wear matching method

Abstract

The invention discloses a porous self-sharpening brazing diamond grinding wheel preparation and abrasive particle wear matching method. The method comprises the following steps that firstly, grindingforce and protrusion height of an abrasive particle which is damaged by 40%-45% and has cutting performance and an abrasive particle which is damaged by 50%-55% and losses cutting performance are detected through a single abrasive particle grinding experiment, and thus an outer force moment and bending stress of the abrasive particles are obtained. Then diamond abrasive particles, CuSn powder, TiH2 powder, and oxidized TiH2 powder are then uniformly mixed, and diamond segments are prepared through die forming and vacuum brazing on mixed powder to prepare a porous brazing grinding wheel. By controlling a content of TiH2 powder subjected to oxidation treatment, holding strength of the abrasive grains is between stress values generated by outer force for damage of 40%-45% and damage of 50%-55%, so that sharp abrasive particles can fully come into play, and can timely fall off when severely worn, and the wear matching effect of the brazing grinding wheel can be achieved.

Description

technical field [0001] The invention relates to a novel abrasive tool preparation technology in the field of advanced manufacturing, in particular to a preparation method of a porous self-sharpening brazed diamond grinding wheel and its abrasive wear matching method. Background technique [0002] In order to overcome the shortcomings of single-layer brazed superhard abrasive grinding wheel with only one layer of abrasive grains in the working layer, the grinding wheel will fail after the abrasive grains are worn out, and the service life is limited. Multi-layer brazed superhard abrasive grinding wheel, the processing efficiency and service life of multi-layer brazed grinding wheel are higher than traditional grinding wheel. However, the multi-layer brazed grinding wheel developed at present also has the following problems: the introduction of the brazing process makes it difficult for the abrasive to fall off in time after losing the cutting ability, and the blunt abrasive g...

AI Technical Summary

Problems solved by technology

However, the multi-layer brazed grinding wheel developed at present also has the following problems: the introduction of the brazing process makes it difficult for the abrasive to fall off in time after losing the cutting ability, and the blunt abrasive grains will cause the increase of the grinding force and the grinding temperature, thereby Affect the quality of the processed surface; at the same time, it is difficult to expose and renew the abrasive grains in the lower layer of the grinding wheel, and the self-sharpening is poor

Adding ceramic hollow balls to the grinding wheel bond material can increase its porosity, but the fragments formed after its crushing may scratch the processing surface and cause a reduction in processing quality; Low (usually below 200°C), the pores generated by decomposition will continue to decrease with the densification of the grinding wheel base material in the subsequent high-temperature sintering, which will obviously affect the pore-forming efficiency

In addition, the current research rarely involves the content of abrasive wear matching, that is, the sharp abrasive grains are not fully utilized, and the phenomenon of severely worn abrasive grains not falling off in time often exists in the grinding process of the grinding wheel. It has an impact on the utilization rate and processing effect of abrasive grains

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