Abstract
Fast and accurate determination of effective bentonite content in used clay bonded sand is very important for selecting the correct mixing ratio and mixing process to obtain high-performance molding sand. Currently, the effective bentonite content is determined by testing the ethylene blue absorbed in used clay bonded sand, which is usually a manual operation with some disadvantages including complicated process, long testing time and low accuracy. A rapid automatic analyzer of the effective bentonite content in used clay bonded sand was developed based on image recognition technology. The instrument consists of auto stirring, auto liquid removal, auto titration, step-rotation and image acquisition components, and processor. The principle of the image recognition method is first to decompose the color images into three-channel gray images based on the photosensitive degree difference of the light blue and dark blue in the three channels of red, green and blue, then to make the gray values subtraction calculation and gray level transformation of the gray images, and finally, to extract the outer circle light blue halo and the inner circle blue spot and calculate their area ratio. The titration process can be judged to reach the end-point while the area ratio is higher than the setting value.
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Wei Long Male, born in 1982, lecturer. Research interest: quality control of clay bonded molding sand.
This work was financially supported by the Natural Science Foundation of Hubei Province of China (2014CFB582).
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Long, W., Xia, L. & Wang, Xl. A rapid automatic analyzer and its methodology for effective bentonite content based on image recognition technology. China Foundry 13, 322–326 (2016). https://doi.org/10.1007/s41230-016-5119-6
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DOI: https://doi.org/10.1007/s41230-016-5119-6