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Cycle Time Optimization in Automatic Screw Tightening Machines
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Author(s): S. Fouziya Sulthana (Department of Mechatronics Engineering, SRM Institute of Science and Technology, Kattankulathur, India)and U. Mohammed Iqbal (Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur, India)
Copyright: 2026
Pages: 30
Source title:
Innovations in Green and Energy-Efficient Warehousing
Source Author(s)/Editor(s): Mohamed Amine Frikha (King Faisal University, Saudi Arabia), Mohieddine Rahmouni (King Faisal University, Saudi Arabia)and Ben Othman Soufiane (King Faisal University, Saudi Arabia)
DOI: 10.4018/979-8-3373-3176-8.ch015
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Abstract
The increasing adoption of mechatronics in the automotive industry has transformed manual operations into automated systems for improved efficiency, quality, and safety. Among these, Automatic Screw Tightening Machines (ASTMs) are widely used in lamp assembly to fasten body and extension parts. However, these machines often face increased cycle times under varying conditions, reducing production throughput. This study addresses cycle time optimization by analyzing the machine's construction, programming, and workflow, followed by a cycle time study to identify bottlenecks. Benchmarking revealed screw feeding as a major contributor to delays. To resolve this, the Anti-Tumble Unit was redesigned with a feed-while-drive mechanism, enabling screw feeding and tightening simultaneously. This improvement reduced cycle time from 45 to 33 seconds, achieving a 26.7% reduction. The findings show that targeted design modifications can significantly enhance automated assembly performance and can be applied to optimize cycle time in other industrial processes.
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