Dressing, grinding wheels

Uses. Apphcations for boron carbide relate either to its hardness or its high neutron absorptivity ( B isotope). Hot-pressed boron carbide finds use as wear parts, sandblast no22les, seals, and ceramic armor plates but in spite of its hardness, it finds Httie use as an abrasive. However, this property makes it particulady usehil for dressing grinding wheels. 

Equivalent to the grinding ratio G, the dressing ratio Gd is the ratio between dressed grinding wheel volume Vsd and dresser wear volume Vd, which is used to characterize the efficiency of the dressing process ... 

Diamond is the hardest known material. For this reason, single-crystal natural-diamond tools have been used in industry for a great number of years, to dress grinding wheels and as cutting tools to finish-machine non-ferrous and non-metallic materials. 

Where the chisel edge is found to be too wide for a particular purpose, it can be reduced by point thinning. Fig. 8.20. This can be done using the edge of a well-dressed grinding wheel, but it is perhaps better left to a more experienced person. 

Coating for nozzles, dressing sticks for grinding wheels. Matrix material for ceramic composites. 1... 

The smaller balls were machined together as one batch of 30 in one operation, while the larger balls were machined in sub-samples of 6-8, For the data evaluation the length of the notch (i.e. the ligament thickness) was determined for each specimen separately. The fillet radius at the notch base and the width of the notch were determined directly on separate specimens, the dimensions of which correspond directly with the thickness and condition of the grinding wheel. Because the fillet radius increases with progressive wear of the wheel requiring the wheel to be dressed after each cut, it was determined for each subsample separately. The relative fillet radius at the notch base was of the order of 0.25 for both types of balls. 

Diamond is extensively used for the dressing of precision grinding wheels. The grinding process using conventional, diamond and cBN abrasives is extensively used in the finishing of ferrous, tungsten carbide and ceramic components. Here, the geometrical tolerance, the surface finish of the wheel and its condition is critical and the dresser s function is to achieve and maintain these characteristics. 

C, and in a non-oxidizing atmosphere, B4C is the hardest compound known up to now. B4C is thus used for wear-resistant parts and inserts for mortars and ball mills, wear plates, sand blasting nozzles, dressing tools for grinding wheels, lightweight armor plates for helicopters, tanks, and in composites of glass fiber-reinforced plastics as bullet-proof protection for personnel. 

The term dressing refers to different processes used to prepare and regenerate the macro and micro geometry of grinding wheels. 

Teti R, D Addona D (2003) Grinding wheel management through neuio-fuzzy forecasting of dressing cycle time. CIRP Amt Manuf Technol 52(1) 407-410... 

In (Brown et al. 2007), F-tests on optically detected volume-filling distributions are used to differentiate between surface layers generated by different dressing conditions and can thus be used to differentiate between worn and new state of the grinding wheel. 

Chen M, Sun F, Liu G, Jian X, Li X (2003) Theoretical and experimental research on generation mechanism of grinding wheel topography by laser dressing and 3D laser scanning. Key Eng Mater 233-236 497-502... 

Introduction of multi-axis machines for freeform machining Introduction of PC-based controls Introduction of electrolytic in-process dressing (ELID) of grinding wheels Improved enviromnental control by air-conditioning of machine housings In the 2000s ... 

Figure 10.7. Dressing the grinding wheel using a diamond...

Sharpness and trueness of the face can be achieved by dressing with an industrial diamond. The diamond, held in a suitable holder, is positioned on the chuck under the grinding wheel. The wheel is then lowered until it touches the diamond, whereupon the diamond is moved across the surface of the wheel using the crosstraverse movement. Fig. 10.7. The wheel is then lowered a little and the operation is repeated until all the worn grains have been torn out and fresh ones exposed and the face is flat and true. 

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