barcode reader library vb.net Fig 328: Radial volumetric wheel wear in Software

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Fig 328: Radial volumetric wheel wear
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versus accumulated metal removed for an external cylindrical plunge grinding operation [12]
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This ratio is commonly used as the performance index to characterize wheel-wear resistance and is usually computed as G = Vw/Vs Malkin [12] has cited the work of Yoshikawa which has classified three general mechanisms of wheel wear as illustrated in Figure 326 (left): attritious wear, grain fracture and bond fracture Jackson [26] has added interfacial grain-bond fracture as the fourth mechanism of wheel wear (Figure 329 (right)) It has been reported that the cutting edges play a predominant role in shearing by plastically deformed workpiece material As the grinding proceeds, the grain fractures leading to the appearance of fresh cutting edges At the same time, the cutting edges get worn off by attrition The cutting edges get worn off at a faster rate compared to the rate of fracture of grains The wear flats generated by attrition slide against the workpiece surface and generate heat [16] Grain fracture refers to the removal of abrasive fragments by fracture within the grain due to mechanical and thermal shock loads, and bond fracture occurs when abrasives are dislodged from the binder
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Fig 329: A schematic illustration of the wheel-wear mechanism: (A) attritious wear, (B) grain fracture, (C) bond
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fracture and (D) interfacial grain-bond fracture [12][26]
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Binder erosion is another type of wear, which is likely to reduce the bond strength and promote grain dislodgment, especially with resin and metal bonded wheels
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346 Truing and Dressing of Grinding Wheels
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Grinding wheels need to undergo truing and dressing processes prior to grinding operations Truing affects the geometry of the rim with respect to the core and the bore of the wheel and ensures that the rim will be entirely in contact with the workpiece during each wheel revolution Truing is an operation, which removes the high spots or profile inaccuracies of the wheel in order to correct the geometrical shape of the wheel, so that it will run concentric to the bore and has the correct profile
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Figure 330 shows the condition of the wheel before and after truing for a peripheral wheel (top) and a cup wheel (bottom) with a high spot location indicated by e A poorly trued wheel will only contact the workpiece with the rim s high spot, which results in an intermittent cutting action and finally produces a poor finish A brake truing device, single-point diamond dresser, diamond nib, metal bonded wheel or a rotary diamond dresser is commonly employed for truing operations Infeed used during truing is in the range of Fig 330: The wheel geometry before and after truing for a 5 40 m per pass until contact is made peripheral wheel (top) and a cup wheel (bottom) [22][27] with high spots indicated by e [22] Dressing is an operation which corrects the surface topography of the abrasive layer so that it has a sharp grit protruding from the bond thus enabling penetration into the workpiece material Theoretically, it removes only bond material and exposes new grits to form new cutting edges on the wheel/rim face without affecting the number of grits per mm2 of the rim Figure 331 (a) shows minimal grit protrusion after truing The protrusion is clearly out of the bond only after a dressing operation as shown in Figure 331 (b) Dressing is usually accomplished by using a soft vitrified aluminium oxide stick, 240 grit or finer, and is normally applied by hand pressure preferably with a coolant [22][28]
Fig 331:
Wheel surface topography after truing: (a) with a minimal grit protrusion out of the bond After dressing (b) shows a clear grit projection away from the bond with sharp cutting edges in the direction of the cutting [22]
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