The formidable and multivariate coal-mining conditions during the production often lead to various improper damage and inactivation of guide foot. Wear is the most severe problem. We do the research on optimization design of the materials by plasma cladding technic to improve the wear resistance: The Cr28MnV ferrous alloy overlay was deposited on the surface of 45# tempered steel backing. The martensitic structure with high strength, high hardness, and high abradability evenly distributed alloy carbide can be gained after cooling the overlay. The combined backing has a good obdurability which can satisfy the requirement of coal mine complex conditions after modifying treatment.
Radar graph fractal method is an effective description for the contour of wear debris. In this paper the principle that radar graph fractal dimension analyzed by computer was researched. In analysis, how to extract contour of wear debris from surrounding is looked as an important process, and three methods was introduced to deal with it: manual method is simple to do, but the result is not accurate for the process could be affected by human mistake; automatic method can deal with the case that multi-wear debris being in an graph, and do the statistic for the result, but it is not good for the graph that wear debris’ gray is similar to surrounding’s, the wear debris contour gotten by this method is often distortional, so the concepts that edge dot extracted ratio and the optimizing threshold method can be introduced to improve it; Semi-automatic method is easy to modify the gotten wear debris contour by change the contrast of graph and the gray of edge dot extracted artificially, improve the definition of wear debris contour. The method radar graph fractal dimension analyzed by computer is more simple and convenient than by hand, its result is also more accurate, better for the using of radar graph fractal description.
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