WIP control at end of line of semiconductor industry using CONWIP

Advancement of technology and trends in globalization has resulted in higher customer demands and expectations. Manufacturers now offer mass customization to stay competitive. In the semiconductor industry, where product mix and volume are high, production is further complicated by the different pro...

Full description

Saved in:

Bibliographic Details
Main Author:	Lim, Ke Sin
Format:	Thesis
Language:	English English
Published:	2014
Subjects:	T Technology (General) TS Manufactures
Online Access:	http://eprints.utem.edu.my/id/eprint/15026/1/WIP%20Control%20At%20End%20Of%20Line%20Of%20Semiconductor%20Industry%20Using%20ConWIP%2024pages.pdf http://eprints.utem.edu.my/id/eprint/15026/2/WIP%20control%20at%20end%20of%20line%20of%20semiconductor%20industry%20using%20CONWIP.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utem-ep.15026
record_format	uketd_dc
spelling	my-utem-ep.150262022-06-10T16:40:49Z WIP control at end of line of semiconductor industry using CONWIP 2014 Lim, Ke Sin T Technology (General) TS Manufactures Advancement of technology and trends in globalization has resulted in higher customer demands and expectations. Manufacturers now offer mass customization to stay competitive. In the semiconductor industry, where product mix and volume are high, production is further complicated by the different process routes and processing times for different product families. Coupled with rapid changeovers of products, it is essential to keep the work in process (WIP) low in order to reduce the inventory level on the shop floor. Constant W1P (CONWIP) is a production control strategy applicable in many manufacturing environment that use cards to control W1P level. This research was conducted in a semiconductor manufacturing company facing difficulty in reducing the variation in WIP on the shopfloor. The objectives of this research are to design and develop simulation models for single loop CONWIP, multi loop CONW1P, hybrid CONW1P, single loop CONWlP and multi loop CONWIP with buffer size optimization based on the environment in the case company. With the developed models, the maximum throughput (TH) and minimum W1P were determined. Discrete event simulation models were developed using the Witness Software for processes at the End of Line (EOL) production in the company. Experiments were conducted using these models to compare the current system with the single loop, multi loop, and hybrid CONWIP control mechanisms. ln addition, buffer optimization incorporating single loop and multi loop control were also examined. Performance parameters of TH and WIP level were compared in all experiments. The results show that CONWTP production control is more effective in reducing WlP level compared to the current system. Secondly, the single loop CONWIP showed the least number of cards in the system. However, hybrid CONWIP is more robust and provides a better control mechanism compared to the single and multi loop system. Buffer optimization control can further reduce the number of cards in the single and multi loop control. The developed simulation models are useful to determine the number of cards in the system and buffer size for each process. With these models, the production personnel can monitor and control the WJP dynamically to meet current demands and utilize the shopfloor space for more productive purposes. 2014 Thesis http://eprints.utem.edu.my/id/eprint/15026/ http://eprints.utem.edu.my/id/eprint/15026/1/WIP%20Control%20At%20End%20Of%20Line%20Of%20Semiconductor%20Industry%20Using%20ConWIP%2024pages.pdf text en public http://eprints.utem.edu.my/id/eprint/15026/2/WIP%20control%20at%20end%20of%20line%20of%20semiconductor%20industry%20using%20CONWIP.pdf text en validuser https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=92142 mphil masters Universiti Teknikal Malaysia Melaka Faculty of Manufacturing Engineering Chong, Kuan Eng
institution	Universiti Teknikal Malaysia Melaka
collection	UTeM Repository
language	English English
advisor	Chong, Kuan Eng
topic	T Technology (General) TS Manufactures
spellingShingle	T Technology (General) TS Manufactures Lim, Ke Sin WIP control at end of line of semiconductor industry using CONWIP
description	Advancement of technology and trends in globalization has resulted in higher customer demands and expectations. Manufacturers now offer mass customization to stay competitive. In the semiconductor industry, where product mix and volume are high, production is further complicated by the different process routes and processing times for different product families. Coupled with rapid changeovers of products, it is essential to keep the work in process (WIP) low in order to reduce the inventory level on the shop floor. Constant W1P (CONWIP) is a production control strategy applicable in many manufacturing environment that use cards to control W1P level. This research was conducted in a semiconductor manufacturing company facing difficulty in reducing the variation in WIP on the shopfloor. The objectives of this research are to design and develop simulation models for single loop CONWIP, multi loop CONW1P, hybrid CONW1P, single loop CONWlP and multi loop CONWIP with buffer size optimization based on the environment in the case company. With the developed models, the maximum throughput (TH) and minimum W1P were determined. Discrete event simulation models were developed using the Witness Software for processes at the End of Line (EOL) production in the company. Experiments were conducted using these models to compare the current system with the single loop, multi loop, and hybrid CONWIP control mechanisms. ln addition, buffer optimization incorporating single loop and multi loop control were also examined. Performance parameters of TH and WIP level were compared in all experiments. The results show that CONWTP production control is more effective in reducing WlP level compared to the current system. Secondly, the single loop CONWIP showed the least number of cards in the system. However, hybrid CONWIP is more robust and provides a better control mechanism compared to the single and multi loop system. Buffer optimization control can further reduce the number of cards in the single and multi loop control. The developed simulation models are useful to determine the number of cards in the system and buffer size for each process. With these models, the production personnel can monitor and control the WJP dynamically to meet current demands and utilize the shopfloor space for more productive purposes.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Lim, Ke Sin
author_facet	Lim, Ke Sin
author_sort	Lim, Ke Sin
title	WIP control at end of line of semiconductor industry using CONWIP
title_short	WIP control at end of line of semiconductor industry using CONWIP
title_full	WIP control at end of line of semiconductor industry using CONWIP
title_fullStr	WIP control at end of line of semiconductor industry using CONWIP
title_full_unstemmed	WIP control at end of line of semiconductor industry using CONWIP
title_sort	wip control at end of line of semiconductor industry using conwip
granting_institution	Universiti Teknikal Malaysia Melaka
granting_department	Faculty of Manufacturing Engineering
publishDate	2014
url	http://eprints.utem.edu.my/id/eprint/15026/1/WIP%20Control%20At%20End%20Of%20Line%20Of%20Semiconductor%20Industry%20Using%20ConWIP%2024pages.pdf http://eprints.utem.edu.my/id/eprint/15026/2/WIP%20control%20at%20end%20of%20line%20of%20semiconductor%20industry%20using%20CONWIP.pdf
_version_	1747833860666687488

WIP control at end of line of semiconductor industry using CONWIP

Similar Items