A Study of the ELID Grinding for Nano Ceramics

Abstract

The grinding properties of ZrO2 nano ceramics are studied by using metal bond diamond wheel and electrolytic in-process dressing (ELID). The influence of grinding parameters such as grinding depth and workpiece feed rate on the grinding force is analyzed. The surface quality and microtopography of the surfaces after grinding are analyzed by using Atomic Force Microscope (AFM). The results are compared with those of the common ZrO2 ceramics. It shows that both grinding force and surface quality of nano ceramics are higher than those of common ceramics for the same grinding conditions. Ductile mode grinding can be easier to achieve in the case of nano ceramics, compared with common ceramics.

Influence of Cutting Conditions on Chip Formation in High Speed Milling of Brittle Graphite

“…It has many interior microdefects such as micropores and microcracks. Therefore, in the cutting process of graphite, graphite chips are mainly produced by cutting impact, crush, and flaking off actions of cutters in the form of brittle fractured chips or dust, which are not like the strip ones produced by plastic flow in metal cutting [1,2,5,6].…”

“…Masuda et al [8] observed that a crack was produced and extended along the cutting direction, and then some workpiece materials were crashed into chips in the turning process of sintered graphite. The authors [1,2,5,6] reported that many fractured craters of various depths were caused on the machined surface; the chip shapes appeared irregularly, and chips like block, strip, sphere, and flake were observed in high speed milling of isotropic graphite; semicontinuous chip, crushed particle chip, and fractured block chip formation were identified as three major types of graphite chip formation, and the chips produced in different type of chip formation exhibited different surface fractography. However, it is necessary to do further study on the influence of cutting conditions on the graphite chip formation so as to get an in-depth understanding of graphite chip formation.…”

Study on Arithmetic of Surface Damage Ratio in High Speed Machining of Graphite Based on Matlab Image Processing

“…In high speed machining of graphite, micro fractured cracks always occur to the graphite machined surfaces under cutting and crushing of cutting tool. Some cracks are almost parallel with the free surface of material, but others go deep into the subsurface and cause brittle fracture surface in the form of fracture craters [5,6] (Fig. 1).…”