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Surface quality control of Al2O3 specimens after lapping

100%

Molenda J.

tom Vol. 23, No. 3

337--343

The finishing processes are an important perspective to be considered today to meet the goals like parallelism, tolerances, flatness and smooth surface of workpieces. These processes are high-precision abrasive processes. A leading importance in this perspective has the lapping process. It leads to a surface with low roughness and high precision. This paper reports the results of surface analysis of sealing elements made of oxide ceramic Al2O3. Because of elements, application as sealing parts in water valves, high surface quality and flatness is required. To meet those requirements grinding and lapping were execute. The first was realized by elements manufacturer, the second – during experiments. Research was carried out on a plate-lapping machine ABRALAP 380 with a grooved cast-iron lapping plate and three conditioning rings. As abrasive material boron carbide was use. Surface quality was investigated firstly after grinding and then, after lapping. A Hommeltester T8000-R60 profilometer with a resolution of 0.01 μm was used. The surface roughness parameters Ra and Rk were studied in the light of varying lapping parameters, like grains size, lapping pressure, velocity and time. According to literature, those are the most extensively used parameters for describing the surface roughness after finishing processes. Additionally the Abbot Firestone curves were analysed.