Home > Published Issues > 2023 > Volume 12, No. 6, November 2023 >
IJMERR 2023 Vol.12(6): 347-353
DOI: 10.18178/ijmerr.12.6.347-353

Optimization of Process Conditions for Hard Disk Drive Assembly for Defect Reduction

Kittiwat Sirikasemsuk 1* and Kanogkan Leerojanaprapa 2
1. Department of Industrial Engineering, School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand
2. Statistics Department, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand
*Correspondence: kittiwat.sirikasemsuk@gmail.com (K.S.)

Manuscript received February 2, 2023; revised March 22, 2023; accepted May 17, 2023.

Abstract—A spoiler installed in a hard disk drive can reduce the airflow velocity that causes vibration at an actuator arm and its head. In the case study, a hard disk drive manufacturer identified the defect of a loosely tightened spoiler in the hard disk drive by the spoiler installation machine. This occurred as a result of incorrect screw spacing (also called ‘the screwdriver encoder’). There was no study that specifically specified or created a suitable relationship model between the screwdriver encoder and associated parameters for the installation of a spoiler. Factors affecting the screw spacing were determined using multiple regression analysis, and a mathematical model of the significant factors of the screwdriver encoder was built. Data were collected from the spoiler installation machine and its software. Four factors were identified with the potential to impact the screwdriver encoder as (1) vacuum level for picking up the screw, (2) time spent in tightening the screw, (3) bit angle, and (4) screw torque. The ANOVA results pointed out that the screw torque within the range of experimental values did not affect the screw spacing, and a quadratic regression model was the most appropriate under various statistical criteria. This research demonstrated that a sophisticated regression model, i.e., a cubic model, is not always a good choice for an agent. In addition, the optimal values for the spoiler installation machine were determined. The faults decreased by 0.0096% from 0.055% each month. For choosing the relationship model of additional workpiece screw tightening variables, this research phase can be utilized as a guideline.

Keywords—spoiler, hard disk drive, linear regression, polynomial regression, analysis of variance

Cite: Kittiwat Sirikasemsuk and Kanogkan Leerojanaprapa, "Optimization of Process Conditions for Hard Disk Drive Assembly for Defect Reduction," International Journal of Mechanical Engineering and Robotics Research, Vol. 12, No. 6, pp. 347-353, November 2023.

Copyright © 2023 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.