Design and Performance Evaluation of a Motor-Driven Adjustable Speed Tool for Corrosion Removal on Bolt Threads in Steam Power Plant Applications
DOI:
https://doi.org/10.52330/jtm.v24i1.523Keywords:
Bolt cleaning, Corrosion removal, Variable-speed too, Cleaning efficiencAbstract
This study presents the design, fabrication, and experimental evaluation of a portable motor-driven adjustable-speed tool for localized corrosion removal on bolt threads in steam power plant maintenance. The prototype combines a variable-speed motor, a rotating wire brush, and a clamping fixture to ensure controlled contact with threaded surfaces. Performance was assessed on corroded bolts (M14 × 60 mm and M16 × 60 mm) at four spindle speeds (450, 900, 1350 and 1800 rpm), recording cleaning time, vibration, and surface temperature. Results show a strong inverse relationship between motor speed and cleaning time; for example, M16 bolts were cleaned in 1.37 minutes at 450 rpm and 0.36 minutes at 1800 rpm. A time-based cleaning efficiency metric peaked at higher speeds for the tested bolt sizes, while higher rpm also increased vibration and surface temperature, indicating an operational trade off. Compared with manual brushing, the prototype delivered faster, more uniform cleaning with reduced operator dependency and lower thread abrasion. An operational range of 1350–1800 rpm is recommended to balance effectiveness and mechanical/thermal constraints. Future work should include quantitative image-based area removal and gravimetric validation to corroborate surface integrity and material removal rates for field deployment.
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