Experimental determination of convective heat transfer coefficient in wire electro discharge machining

Wire electro discharge machining (WEDM) is a fully extended and competitive machining process widely used to produce dies and moulds. However, the risk of wire breakage affects adversely the full potential of WEDM since the overall process efficiency is considerably reduced. These symptoms are espec...

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Main Author:	Nadiah Waznah, Zabidi
Format:	Undergraduates Project Papers
Language:	English
Published:	2008
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/155/ http://umpir.ump.edu.my/id/eprint/155/ http://umpir.ump.edu.my/id/eprint/155/1/5_Nadiah_Waznah_Zabidi.pdf

id	ump-155
recordtype	eprints
spelling	ump-1552015-03-03T06:15:36Z http://umpir.ump.edu.my/id/eprint/155/ Experimental determination of convective heat transfer coefficient in wire electro discharge machining Nadiah Waznah, Zabidi TJ Mechanical engineering and machinery Wire electro discharge machining (WEDM) is a fully extended and competitive machining process widely used to produce dies and moulds. However, the risk of wire breakage affects adversely the full potential of WEDM since the overall process efficiency is considerably reduced. These symptoms are especially related to the occurrence of an increase in discharge energy, peak current, as well as increases or decreases in ignition delay time. Because of that, an experimental determination method of the convective heat transfer coefficient in wire electro discharge machining is introduced to prevent the wire breaks during running the machine. Parameters such as peak current and flushing pressure are studied. A special device is developed to measure the average temperature increment of the wire after a period of short circuit discharges, and the thermal load imposed on the wire is also tracked and recorded in advance. Then, based on the thermal model of the wire, the convective coefficient can be calculated accurately. Some tuning experiments are carried out inside and outside a previously cut profile to examine the influence of the kerf on the convective coefficient. With this method, the effect of the coolant flushing pressure on the convective coefficient can be estimated. Based on the results of the analyses, this paper contributes to improve the process performance through a wire breakage. 2008-11 Undergraduates Project Papers NonPeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/155/1/5_Nadiah_Waznah_Zabidi.pdf Nadiah Waznah, Zabidi (2008) Experimental determination of convective heat transfer coefficient in wire electro discharge machining. Faculty of Mechanical Engineering, Universiti Malaysia Pahang. http://iportal.ump.edu.my/lib/item?id=chamo:41106&theme=UMP2
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Nadiah Waznah, Zabidi Experimental determination of convective heat transfer coefficient in wire electro discharge machining
description	Wire electro discharge machining (WEDM) is a fully extended and competitive machining process widely used to produce dies and moulds. However, the risk of wire breakage affects adversely the full potential of WEDM since the overall process efficiency is considerably reduced. These symptoms are especially related to the occurrence of an increase in discharge energy, peak current, as well as increases or decreases in ignition delay time. Because of that, an experimental determination method of the convective heat transfer coefficient in wire electro discharge machining is introduced to prevent the wire breaks during running the machine. Parameters such as peak current and flushing pressure are studied. A special device is developed to measure the average temperature increment of the wire after a period of short circuit discharges, and the thermal load imposed on the wire is also tracked and recorded in advance. Then, based on the thermal model of the wire, the convective coefficient can be calculated accurately. Some tuning experiments are carried out inside and outside a previously cut profile to examine the influence of the kerf on the convective coefficient. With this method, the effect of the coolant flushing pressure on the convective coefficient can be estimated. Based on the results of the analyses, this paper contributes to improve the process performance through a wire breakage.
format	Undergraduates Project Papers
author	Nadiah Waznah, Zabidi
author_facet	Nadiah Waznah, Zabidi
author_sort	Nadiah Waznah, Zabidi
title	Experimental determination of convective heat transfer coefficient in wire electro discharge machining
title_short	Experimental determination of convective heat transfer coefficient in wire electro discharge machining
title_full	Experimental determination of convective heat transfer coefficient in wire electro discharge machining
title_fullStr	Experimental determination of convective heat transfer coefficient in wire electro discharge machining
title_full_unstemmed	Experimental determination of convective heat transfer coefficient in wire electro discharge machining
title_sort	experimental determination of convective heat transfer coefficient in wire electro discharge machining
publishDate	2008
url	http://umpir.ump.edu.my/id/eprint/155/ http://umpir.ump.edu.my/id/eprint/155/ http://umpir.ump.edu.my/id/eprint/155/1/5_Nadiah_Waznah_Zabidi.pdf
first_indexed	2023-09-18T21:52:02Z
last_indexed	2023-09-18T21:52:02Z
_version_	1777413832909520896

Experimental determination of convective heat transfer coefficient in wire electro discharge machining

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