Improvement of Form Accuracy and Surface Integrity of Si-HDPE Hybrid Micro-Lens Arrays in Press Molding

Press molding of silicon (Si)/high-density polyethylene (HDPE) composite is an important technology for producing thin hybrid infrared (IR) optics with microstructures. In this research, Si-HDPE hybrid micro-lens arrays were press molded under various conditions, and the form accuracy and surface in...

Full description

Bibliographic Details
Main Authors:	Ahmad Rosli, Abdul Manaf, Jiwang, Yan
Format:	Article
Language:	English
Published:	Elsevier Ltd 2017
Subjects:	TS Manufactures
Online Access:	http://umpir.ump.edu.my/id/eprint/16480/ http://umpir.ump.edu.my/id/eprint/16480/ http://umpir.ump.edu.my/id/eprint/16480/ http://umpir.ump.edu.my/id/eprint/16480/1/fkp-2017-rosli-Improvement%20of%20form%20accuracy1.pdf

id	ump-16480
recordtype	eprints
spelling	ump-164802017-06-16T07:00:34Z http://umpir.ump.edu.my/id/eprint/16480/ Improvement of Form Accuracy and Surface Integrity of Si-HDPE Hybrid Micro-Lens Arrays in Press Molding Ahmad Rosli, Abdul Manaf Jiwang, Yan TS Manufactures Press molding of silicon (Si)/high-density polyethylene (HDPE) composite is an important technology for producing thin hybrid infrared (IR) optics with microstructures. In this research, Si-HDPE hybrid micro-lens arrays were press molded under various conditions, and the form accuracy and surface integrity of the molded lenses were evaluated. Air trapping occurs inside the micro-lens cavities during molding in a non-vacuum environment, which leads to severe surface defects. To investigate the air trapping phenomenon, a new in-situ observation system was developed which enables real-time direct observation of the molding process. From the in-situ observations, it was found that air traps were formed among the HDPE pellets during melting, and an increase in the pressing force will increase the pressure of the trapped air, forming trenches on the lens surface. The trapped air also impacts the mold coating, causing trench formation on the coating surface. To minimize air trapping, the molding temperature, and pressing force must be strictly controlled. By performing press molding in a vacuum environment, trench formation was completely eliminated. Moreover, polymer shrinkage compensation was performed to improve the lens form accuracy. Elsevier Ltd 2017 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/16480/1/fkp-2017-rosli-Improvement%20of%20form%20accuracy1.pdf Ahmad Rosli, Abdul Manaf and Jiwang, Yan (2017) Improvement of Form Accuracy and Surface Integrity of Si-HDPE Hybrid Micro-Lens Arrays in Press Molding. Precision Engineering, 47. pp. 469-479. ISSN 0141-6359 https://doi.org/10.1016/j.precisioneng.2016.10.002 DOI: 10.1016/j.precisioneng.2016.10.002
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TS Manufactures
spellingShingle	TS Manufactures Ahmad Rosli, Abdul Manaf Jiwang, Yan Improvement of Form Accuracy and Surface Integrity of Si-HDPE Hybrid Micro-Lens Arrays in Press Molding
description	Press molding of silicon (Si)/high-density polyethylene (HDPE) composite is an important technology for producing thin hybrid infrared (IR) optics with microstructures. In this research, Si-HDPE hybrid micro-lens arrays were press molded under various conditions, and the form accuracy and surface integrity of the molded lenses were evaluated. Air trapping occurs inside the micro-lens cavities during molding in a non-vacuum environment, which leads to severe surface defects. To investigate the air trapping phenomenon, a new in-situ observation system was developed which enables real-time direct observation of the molding process. From the in-situ observations, it was found that air traps were formed among the HDPE pellets during melting, and an increase in the pressing force will increase the pressure of the trapped air, forming trenches on the lens surface. The trapped air also impacts the mold coating, causing trench formation on the coating surface. To minimize air trapping, the molding temperature, and pressing force must be strictly controlled. By performing press molding in a vacuum environment, trench formation was completely eliminated. Moreover, polymer shrinkage compensation was performed to improve the lens form accuracy.
format	Article
author	Ahmad Rosli, Abdul Manaf Jiwang, Yan
author_facet	Ahmad Rosli, Abdul Manaf Jiwang, Yan
author_sort	Ahmad Rosli, Abdul Manaf
title	Improvement of Form Accuracy and Surface Integrity of Si-HDPE Hybrid Micro-Lens Arrays in Press Molding
title_short	Improvement of Form Accuracy and Surface Integrity of Si-HDPE Hybrid Micro-Lens Arrays in Press Molding
title_full	Improvement of Form Accuracy and Surface Integrity of Si-HDPE Hybrid Micro-Lens Arrays in Press Molding
title_fullStr	Improvement of Form Accuracy and Surface Integrity of Si-HDPE Hybrid Micro-Lens Arrays in Press Molding
title_full_unstemmed	Improvement of Form Accuracy and Surface Integrity of Si-HDPE Hybrid Micro-Lens Arrays in Press Molding
title_sort	improvement of form accuracy and surface integrity of si-hdpe hybrid micro-lens arrays in press molding
publisher	Elsevier Ltd
publishDate	2017
url	http://umpir.ump.edu.my/id/eprint/16480/ http://umpir.ump.edu.my/id/eprint/16480/ http://umpir.ump.edu.my/id/eprint/16480/ http://umpir.ump.edu.my/id/eprint/16480/1/fkp-2017-rosli-Improvement%20of%20form%20accuracy1.pdf
first_indexed	2023-09-18T22:22:12Z
last_indexed	2023-09-18T22:22:12Z
_version_	1777415731086884864

Improvement of Form Accuracy and Surface Integrity of Si-HDPE Hybrid Micro-Lens Arrays in Press Molding

Similar Items