Microscopic Wear Characteristics of Ceramic Grinding Wheel in Creep Feed Grinding

This paper deals with the microscopic wear characteristics of ceramic (Seeded Gel, SG) grinding wheels used in creep feed grinding. Creep feed grinding experiments with SG grinding wheels were carried out compared to rose-pink alumina (RA) grinding wheels. To clear the wear characteristics of the wheel working surface in creep feed grinding, changes in the shapes of grain cutting edges were observed by a field emission-scanning electron microscope (FE-SEM). This is a self-sharpening phenomenon based on micro fractures generated on the top of SG grain cutting edges. On the other hand, large fracture and attritious wear effected RA grain cutting edges. In addition, the features of any grain cutting edges were evaluated using attritious wear flat percentage. Changes in attritious wear flat percentage of SG grits maintained constant value and were stable. From these results, the influence of wear mode of the grinding wheel on grinding characteristics parameter, such as grinding force and workpiece surface roughness, is understood.

Erratum: Aulestia Viera, M., et al. A Time–Frequency Acoustic Emission-Based Technique to Assess Workpiece Surface Quality in Ceramic Grinding with PZT Transducer. Sensors 2019, 19, 3913

The authors wish to make the following erratum to this paper [...]

Simulation of Ceramic Grinding Mechanism Based on Discrete Element Method

The grinding mechanism is the base of developing new precision machining technology, especially for brittle materials including ceramics. In previous work, many results were gained from single grit cutting model in which a grit is in contact continuously with a workpiece, similar to the indentation or scratching process, to model the material remove in grinding processing. However, the abrasives are distributed randomly on the surface of the grinding wheel, and they will impact the workpiece periodically in the grinding process. In this study, the discrete element method was introduced to simulate the mechanics behavior of [Formula: see text] ceramic. The model was validated by simulating indentation test. Both linear scratching test and pendulum scratching test have been simulated in this paper to model the grinding process. The cracks initiation and propagation were also investigated. This study has demonstrated that we should pay close attention to pendulum scratching test to explore the grinding mechanism, and concentrate on cracks initiation and propagation.

Device of magnesium alloy grinding using periodic cleaning of the active surface of grinding wheel during machining

In the paper the range of requirements concerning grinded surface layers for deposition of protective PVD coatings on magnesium alloys has been presented. Also difficulties concerning the preparation of surface layer and literature review have been depicted. For solving of the problems concerning proper preparation of magnesium alloy surface layer the conventional grinding process using ceramic grinding wheels and the process of cleaning of CSGW during machining has been applied. The machining parameters has been determined and the surface geometrical structure has been assessed using optical profiling in 3D configuration.