Original scientific paper

https://doi.org/10.31803/tg-20240514083303

Optimizing Perforated Bellows Formation: Achieving Uniformity and Precision through Proportional Roll Mold Transfer and Length Reduction

Nam Do Baek ; Jeil Industry, No. 30, Yeongdong 1-Gil, 50567 Yangsan-Si, South Korea
Keun-Wook Baek ; Jeil Industry, No. 30, Yeongdong 1-Gil, 50567 Yangsan-Si, South Korea
Young-Min Ji ; Jeil Industry, No. 30, Yeongdong 1-Gil, 50567 Yangsan-Si, South Korea
Hak-Geun Choi ; Jeil Industry, No. 30, Yeongdong 1-Gil, 50567 Yangsan-Si, South Korea
Dong-Hyun Cho ; Department of Mechanical Engineering, Daejin University, Gyeonggi-do, Pocheon-si, 1007 Hoguk-ro, South Korea *

* Corresponding author.

Abstract

This study presents an experimental device designed for single-process formation of perforated bellows through proportional control transfer of the roll mold, ensuring uniformity in thickness and height. A simulation assessed these parameters to establish allowable values, which were validated against experimental data. By implementing a linear acceleration proportional control transfer system for the upper and lower die roll molds, uniform thickness within an error range of 0.02-0.03 mm was achieved. An upper die and lower die roll mold linear acceleration proportional control transfer control system was configured so that ten upper die roll molds and 11 lower die roll molds that form the crests and roots of bellows can be transferred at the same linear acceleration as that of the reduction of the length of the cylinder in the process of manufacturing the crest and root to conduct an experimental study. Experimental findings revealed a minimal thickness error range of 0.02-0.03 mm, demonstrating high uniformity and reliability in the manufactured perforated bellows. Moreover, the study verified the durability and strength of the bellows through thorough assessments of thickness reduction values, which ranged from 0.02 to 0.1 mm. Both experimental and simulated strain rate analyses showed a strong correlation, validating the effectiveness of the proposed manufacturing approach. Therefore, the reliability of the allowable strength and durability of the perforated bellows was secured based on the results of the study on the uniformity of the thickness of the perforated bellows about changes in the thickness of the perforated bellows. Overall, this research establishes a robust methodology for achieving uniformity and reliability in perforated bellows production, offering significant advancements in industrial applications where precise dimensional control and durability are paramount.

Keywords

one-process forming; perforated bellows; proportional control transfer; silencer; uniformity

Hrčak ID:

335254

URI

https://hrcak.srce.hr/335254

Publication date:

15.12.2025.

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