Diamond grinding wheels grain size

Grain Size of Used Diamond Grinding Wheels... 

The grain size of diamond grinding wheel has the characteristics presented in Table 9.2. 

The Mackensen blower method is found to be harder to relate to Vickers hardness determined by diamond indenter, although analysing the results of tests carried out by the two methods on ceramic grinding wheels using alundum as the abrasive (A. Szymanski, 1968c), results qualitatively similar are observable (Fig. 4.5.12). Alundum grains, size 8 (3.15-2.50 mm), were moulded in a ceramic binder and fired at various temperatures ranging from 1470 to 1630 K, with one-hour time delay. Polished sections were... 

Ductile-Mode Ultra-Smoothness Grinding of Fine Ceramics with Coarse-Grain-Size Diamond Wheels... 

This chapter introduces that the coarse 140-mesh diamond wheel can be used for ultra-smoothness grinding of fine ceramics. First of all, we discuss that ductile-mode grinding of fine ceramics with the coarse 140-mesh metal-bonded diamond wheel is possible because of the experimental relationship between the table speed and the groimd workpiece smiace. Second, the influence of the speed of the wheel and the workpiece material on ductile-mode grinding is explained. Finally, the newly developed ductile-mode ultra-smoothness grinding method with coarse-grain-size wheel, in which the resultant smiace roughness is below about 10 ran (P-V) and 1 nm (RMS), is introduced. 

As stated above, ductile-mode grinding of fine ceramics is possible with plunge grinding with the coarse 140-mesh grain-size diamond wheel. The 3D surface roughness in ductile-mode plunge grinding, however, is limited... 

Yasui, H., Arino, Y., and Matsimaga, K., Ductile-mode high smoothness grinding of fine ceramics by diamond wheel of coarse grain size (1st Report), Journal of the Japan Society for Precision Engineering, Vol. 63, No. 9,1997,1270. 

Yasui, H., Yamazaki, G., Hiraki, Y., Sakamoto, S., Sakata, M., Saeki, M., and Hosokawa, A., Ultra-smoothness grinding of fine ceramics with 140-mesh grain size diamond wheel. Proceedings of 14th American Society for Precision Engineering, Annual Meeting, 1999,125. 

The experiments were conducted on a vertical rotary surface grinder with a 5.5 kW motor spindle. The feed can be continuously adjusted within a range. The workpieces were made from intered sintered reaction-bonded silicon nitride (SRBSN) and cast-and-sintered silicon nitride (Si3N4). The grain size was between 0.3 and 0.4 pm for SRBSN and between 0.6 and 0.8 pm for SiaN4. Cast-iron fiber-bonded diamond wheels of 200 mm diameter were used. A Noritake AFG-M grinding fluid at a rate of 20-30 L/min was used as electrolytic fluid. 

When grinding is performed on a rotating wheel instead of diamond disks, it is possible to use pastes, suspensions, or sprays with diamond grain sizes of 9-45 pm. Hard synthetic cloths, which are sometimes perforated, are used as the un-... 

Grinding, lapping, and pohshing wheels often employ loose abrasive grains that are delivered in some type of oil- or water-based vehicle. Diamonds, corundum, silicon carbide, and rouge (an iron oxide) are used in loose form over a variety of grain size ranges. 

Grain size is a major factor in the surface finish but the method of dressing the wheel also plays an important part. Fine finishes can be obtained with relatively coarse wheels if the wheel is dressed carefully with a diamond and grinding infeed is properly adjusted. A poor finish can result even with a fine wheel if the grinding techniques used are wrong. 

Early Results and Comments. Figure 3 is a TMAFM image of a dispersed clay on a polished sapphire substrate in DI water. The particles are phlogopite from Ontario, Canada. Fine grains of phlogopite were obtained by grinding a sample on a fixed diamond wheel, from which the size fraction below two microns diameter was separated out using sedimentation techniques. 

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