The polishing process of advanced ceramic balls using a novel eccentric lapping machine

This source preferred by Mark Hadfield

Authors: Kang, J. and Hadfield, M.

http://journals.pepublishing.com/content/7j0x2411x331t523/

Journal: Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture

Volume: 219

Pages: 493-504

ISSN: 0954-4054

DOI: 10.1243/095440505X32382

n which most of the stock from the ball is removed at a higher material removal rate. The second step is polishing in which the required ball surface roughness, roundness, and dimensional and geometric accuracy are achieved. In polishing, the abrasive particle size is ≤ 1 μm, and the load and speed are lower than lapping.

A novel eccentric lapping machine is used for polishing hot isostatically pressed (HIPed) silicon nitride balls. In the initial polishing stage, the polishing load is demonstrated as being most influential in the reduction of surface roughness value Ra. However, in the later polishing stages, the erosive process played a major role in the further reduction of Ra, although the high roughness peaks cannot be removed by erosive process alone. Experimental results also show that, in order to achieve desired surface roughness value, the initial surface quality of the upper plate should be reasonably high, and deep scratches on the ball surface from previous lapping processes should be avoided.

The best polishing results achieved were surface roughness values of Ra of 0.003 μm and r.m.s. (Rq) of 0.004 μm, ball roundness of 0.08-0.09 μm. This proves that the novel eccentric lapping machine is also suitable for polishing advanced ceramic balls.

This data was imported from Scopus:

Authors: Kang, J. and Hadfield, M.

Journal: Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture

Volume: 219

Issue: 7

Pages: 493-504

ISSN: 0954-4054

DOI: 10.1243/095440505X32382

The finishing process of advanced ceramic balls can be divided into two steps. The first step is lapping in which most of the stock from the ball is removed at a higher material removal rate. The second step is polishing in which the required ball surface roughness, roundness, and dimensional and geometric accuracy are achieved. In polishing, the abrasive particle size is ≤1 μm, and the load and speed are lower than lapping. A novel eccentric lapping machine is used for polishing hot isostatically pressed (HIPed) silicon nitride balls. In the initial polishing stage, the polishing load is demonstrated as being most influential in the reduction of surface roughness value Ra. However, in the later polishing stages, the erosive process played a major role in the further reduction of Ra, although the high roughness peaks cannot be removed by erosive process alone. Experimental results also show that, in order to achieve desired surface roughness value, the initial surface quality of the upper plate should be reasonably high, and deep scratches on the ball surface from previous lapping processes should be avoided. The best polishing results achieved were surface roughness values of Ra of 0.003 μm and r.m.s. (Rq) of 0.004 μm, ball roundness of 0.08-0.09 μm. This proves that the novel eccentric lapping machine is also suitable for polishing advanced ceramic balls. © IMechE 2005.

This data was imported from Web of Science (Lite):

Authors: Kang, J. and Hadfield, M.

Journal: PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE

Volume: 219

Issue: 7

Pages: 493-504

ISSN: 0954-4054

DOI: 10.1243/095440505X32382

The data on this page was last updated at 05:12 on February 26, 2020.