Affiliation:
1. School of Mechanical and Material Convergence Engineering, Gyeongsang National University, Jinju 52725, Republic of Korea
2. Engineering Ceramics Department, Korea Institute of Material Science, Changwon 51508, Republic of Korea
Abstract
This study has focused on analyzing the impact of material characteristics and grinding conditions on the surface roughness in ELID grinding of ceramic materials intended for bearing balls. The main research objective was to examine the feasibility of achieving the required surface roughness for G5 class bearing balls through a high-efficiency and high-precision ELID grinding process. Three types of silicon nitride specimens and two types of grinding wheels with cBN and diamond abrasives were prepared for the experiments. An HP (high-pressure) specimen was fabricated through high-temperature and high-pressure sintering at 1700 °C for 2 h, containing a composition of Y2O3 and MgO in Si3N4, while GPS 1hr and GPS 6hr specimens were prepared using gas-pressure sintering for 1 h and 6 h, respectively. From the experimental results, it has been confirmed through surface morphology and surface roughness analysis that material characteristics and grinding parameters affect the surface roughness of silicon nitride ceramics during the grinding process. The surface ground with a #2000 diamond wheel is at a level that can satisfy the required surface roughness, 0.014 um or less in G5 class bearing balls. Based on the analysis of surface morphology and roughness in grinding processes, the #325 cBN wheel exhibited excellent performance in rough grinding, while the #2000 diamond wheel demonstrated highly effective surface finishing performance, indicating that the combination of these two abrasives can be effectively utilized for high-efficiency and high-precision nanosurface machining of silicon nitride ceramics.
Funder
Korea Institute of Material Science
Subject
Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science
Reference34 articles.
1. Feasibility Evaluation of Micro Hole Drilling and the Material Properties of Si3N4/hBN Ceramic with hBN Contents;Park;J. Korean Soc. Manuf. Process Eng.,2017
2. Correlation between Dielectric Constant Change and Oxidation Behavior of Silicon Nitride Ceramics at Elevating Temperature up to 1000 °C;Yong;J. Korea Inst. Mil. Sci. Technol.,2022
3. Effect of Annealing Process Pressure over Atmospheric Pressure on Cu2ZnSn(S,Se)4 Thin Film Growth;Lee;Korean J. Mater. Res.,2019
4. Thin Metal Meshes for Touch Screen Panel Prepared by Photolithography;Kim;J. Korean Inst. Surf. Eng.,2016
5. Application of Silicon Nitride (Si3N4) Ceramics in Ball Bearing;Wijianto;Media Mesin Maj. Tek. Mesin,2016