Bucket Wheel Excavator Teeth Reinforcement via Design of Experiments
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Abstract
The reinforcement of materials for Bucket Wheel Excavator (BWE) teeth was investigated using the Design of Experiment (DOE) technique. The primary objectives were to identify the causes of wear, determine the material factors affecting wear, and compare the Performance of reinforced teeth across three material types: SS400, S50C, and SCM440. Forty-eight teeth of each type were used on one rotating wheel, sized 38×38×250 mm, with the reinforced teeth weighing no more than 50 kg each.
The DOE analysis revealed that material type significantly impacts hardness (p-value = 0.016) with a very large effect size (η² ≈ 93.63% and high Cohen's d for all Pairs). Specifically, SCM440 achieved the highest hardness and significantly differed from SS400 both statistically and practically. S50C was also practically harder than SS400. While post-hoc tests (e.g., Bonferroni) did not detect statistical differences for all Pairs (e.g., SCM440 vs. S50C), the consistently high Effect Size confirms the Practical significance of these differences. Therefore, selecting SCM440 is the most suitable choice for maximum hardness. This superior mechanical property is consistent with the field experiment’s wear Performance, even under varying abrasive conditions. The field test showed that the high-hardness SCM440 was able to operate in the most severely abrasive environment (100% sand content), which strongly supports the conclusion that SCM440 offers better wear resistance than S50C and SS400, especially in highly corrosive environments.
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