Research On Wear Mechanism Of Electroplated Diamond Micro-grinding Tools Based On Hard Brittle Materials In Micro-grinding

Miniaturized devices and micro-sized products play an increasingly important role in the defense technology, biomedical, aerospace, information technology, automobile manufacturing, energy and other key areas with the significant advantages of small size, rugged, high precision, stable performance, energy efficiency, intelligent and so on. Micro-scale pressing technology is one of the most effective means of machining to obtain a part with small dimensional characteristics. However, the surface quality obtained by processing technology of micro-milling which is widely used before is relatively poor. Whereas the better surface quality can be gained in the grinding process, there are more and more studies about processing technology of micro-grinding in China and abroad in order to obtain a better surface quality in micro-machining.This thesis is an attempted and exploratory research concerning wear mechanism of electroplated diamond micro-grinding tools in micro-grinding of hard brittle materials, mainly discusses the wear mechanism and wear factors of micro-grinding tools, and builds the mathematical prediction model of micro-grinding tools wear initially.(1) First this thesis discusses the machining mechanism of micro-scale grinding, analysis the mechanism of material removal and the process of chip formation of brittle materials in micro-grinding briefly, and introduces the undeformed chip thickness and surface roughness mathematical models of micro-grinding.(2) In this paper, the author analysis the electroplated diamond micro-grinding tools wear mechanism and the diamond grits wear mechanism in micro-grinding, discusses the interaction of the grits, the plating layer, the workpiece material and the chip in micro-grinding zone, and then creates three-dimensional models. The mathematical prediction model of micro-grinding tools wear is built initially considering the characteristics of micro-grinding.(3) In the experimental study, the thesis has completed two exploratory experimental studies in order to determine the experiment parameters and the material dimensions of the main experiments. In the micro-grinding tools wear experiments, we main investigation the impact of spindle speed and feed rate on the wear of electroplated diamond micro-grinding tools. In addition, this thesis also studies the influence of electroplated diamond micro-tools wear on the surface quality and the grits wear mechanism.(4) By comparing and analyzing the data solved from the data of experiments with the data solved from the mathematical prediction model of micro-grinding tools wear, the mathematical prediction model in this thesis is confirmed, and provides a theoretical and experimental basis for the study of micro-grinding tools wear mechanism.(5) Finally, conclusions are summarized and the defects of the subject research are illustrated. Some recommendations for future are provided.