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Abstract

This study attempts to validate and analyze the mathematical models of the plowing dynamics and trajectory curve for tiller and cultivation blades of a rotary cultivator. Both blades are extensively used in Taiwan. The blade must be protected from intertwisting to ensure high efficiency and uniform resistance of the plow to soil. Theoretical and calculated cutting angles are found to be 85.88° and 84.28°, respectively, while the theoretical and calculated edge-curve angles are 59.70° and 58.31°. The present data confirmed that the tiller blades developed by local companies are suitable for the plowing environment in Taiwan. In order to reduce the cost from frequent change of the blade due to wear and tear, the Nickel-Base alloy powder welding technique was applied to increase the surface hardening of tiller blades. The surface temperature of coated blades measured by the infrared thermal imager has show that, at the measurement spots, both the instant heat image displayed in the thermal imager and the surface temperature of the heat radiation collected after eight seconds were consistent with earlier results. When thess six pieces of tiller blades were tested at the same time, the six sets of heat radiant temperatures of the corresponding points obtained from the thermal imager were found similar and evenly distributed. In the Schwingung Reibung Verschleiss (SRV) testing mechanism experiment, the duration of attrition for the coating and the abrasive parameters has shown that SUP-HT specimens performed better than the SUP-H specimens. The SUP-HT also has a better anti-oxidized function with a hardness parameter (HRc) of 58 ~ 60. The adherence after compression has graded as Aclass under Scanning Electronic Microscopy (SEM). It can be proved that the coating surface of the tiller blades treated with alloy powder welding would increase uniformity, precision and stability when using the alloy powder spray-welding mechanism developed in this study. As it is applied to the real situation, the natural soil can free from the contamination of iron particle coming off the blades up to 618,000 kg. Meanwhile, a labor cost of 7.5 hr and equipment cost 4,620 NT can be saved per set of tractor, minimizing the cost of production.

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