Research in rake tines wear
2018
Kaminski, J., Warsaw Univ. of Life Sciences (Poland) | Sypola, M., Warsaw Univ. of Life Sciences (Poland) | Chlebowski, J., Warsaw Univ. of Life Sciences (Poland) | Nowakowski, T., Warsaw Univ. of Life Sciences (Poland)
Before going of the machine into exploitation, the measurements of the new tines welded to the drum rakes were performed. After collecting rocks from the surfaces of 102 ha and 222 ha, the measurements of the worn tines welded to the drum rakes were performed. Differences in dimensions of the individual tines after wear in two phases were determined. Volumetric and mass wear of the tines were specified. The percentage loss of tine mass due to abrasion was calculated. Mass index of tines wear, expressed in mg·haE-1, taking into account the treated surface, was calculated. Mass index of tine wear, expressed in mg·kmE-1 in terms of the path travelled by tine, was calculated. The degree wear of tines with a thickness of 20 mm depended on the type of steel of which the tines were made. In the long term exploitation, tines made of Hardox steel were characterized by the highest average consumption of 158 mg·kmE-1, and differences in the consumption of tines made of Hadfield and boron steel were insignificant and amounted to 131 mg·kmE-1 and 130 mg·kmE-1, respectively. The tines of smaller cross-section (thickness of 16 mm), made of the same boron steel were worn more intensively than the tines of greater thickness (20 mm), and the average values of the indicators were amounted to 152 mg·kmE-1 and 130 mg·kmE-1, respectively. Tines made of Hardox steel were characterized by the biggest non-uniformity of wear. The standard deviations from the mean value of tine wear after the second stage did not exceed 18.4 % for Hardox steel, 16.0 % for Hadfield steel and 13.0 % for boron steel.
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