Grinding wheel surface abrasive particles

Many researchers have studied the micro morphology of abrasive grains on the wheel surface. At present, the evaluation of abrasive grains emerging from the wheel surface mainly focuses on the distribution of abrasive grains emerging height, the number of effective abrasive grains, the distance between abrasive grains and Fractal dimension.

(1) Grinding grain edge height: The grinding grain edge height is the height at which the grinding grain protrudes from the surface of the grinding wheel bond. Currently, this parameter has become an important indicator for measuring the machining performance of the grinding wheel, and is also a very important parameter in grinding. The surface roughness of the workpiece, sub surface damage, and wear of the grinding wheel are closely related to the grinding grain edge height. Low grinding grain edge height can easily cause insufficient chip holding space of the grinding wheel, Increase the load on the grinding wheel, thereby increasing the grinding force and temperature. If the height of the abrasive grain is too high, it will weaken the holding force of the abrasive grain, easily fall off, and exacerbate the wear of the grinding wheel. The uniformity of the height of abrasive particles determines the surface roughness of the workpiece, which in turn affects the grinding effect.

(2) Static effective abrasive particle density of grinding wheel: If a certain cutting depth is determined along the radial direction of the working surface of the grinding wheel, the abrasive particles included in the cutting depth range of the grinding wheel are involved in grinding, and the number of abrasive particles contained per unit area is defined as the static effective abrasive particle density. At present, this parameter is also used as a general parameter for evaluating the surface of grinding wheels.

(3) Grinding particle spacing: The grinding particle spacing refers to the distance between two adjacent grinding particles on the grinding wheel surface that successively grind the same point of the workpiece along the grinding direction, that is, the distance between two adjacent grinding particles in the grinding direction within the area limited by the undeformed chip width and the cutting depth of the grinding wheel. The spacing between abrasive particles affects the thickness of undeformed chips, which in turn affects the grinding force and surface roughness of the workpiece. However, the statistical calculation of abrasive particle spacing has certain difficulties.

(4) Fractal dimension: the Fractal dimension of the abrasive grain perimeter evaluates the degree of grinding wheel abrasive grain breakage. The general Fractal dimension measurement methods are: ① based on the perimeter, measure the filling degree of the fractal island perimeter in the plane, which is used to measure the Fractal dimension of the perimeter; ② Based on the area, determine the filling degree of the fractal island itself in the plane to determine the area Fractal dimension. This parameter is mainly used to evaluate the degree of fragmentation of grinding wheel particles.

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