A Study of the Distribution of Discharge Location of WEDM

碩士 === 國立臺灣大學 === 機械工程學研究所 === 89 === In this study, a discharge location detection system is designed and implemented based on the principle of discharge location detection. All the practical problems encountered, including EMI prevention, electrical circuit noises reduction and system calibration,...

Full description

Bibliographic Details
Main Authors: Ming-Tsong Hong, 洪銘聰
Other Authors: Y. S. Liao
Format: Others
Language:zh-TW
Published: 2001
Online Access:http://ndltd.ncl.edu.tw/handle/55285699199478085532
id ndltd-TW-089NTU00489162
record_format oai_dc
spelling ndltd-TW-089NTU004891622016-07-04T04:17:15Z http://ndltd.ncl.edu.tw/handle/55285699199478085532 A Study of the Distribution of Discharge Location of WEDM 線切割式放電加工(WEDM)放電點位置分佈之研究 Ming-Tsong Hong 洪銘聰 碩士 國立臺灣大學 機械工程學研究所 89 In this study, a discharge location detection system is designed and implemented based on the principle of discharge location detection. All the practical problems encountered, including EMI prevention, electrical circuit noises reduction and system calibration, are also discussed. With the use of this system, the research is divided into three parts. The first part is to estimate the workpiece''s shape and height by using the discharge location detection method. The method used in the past for estimating the workpiece''s height is rather complex and its validity is limited only to certain working conditions. In contrast, the method developed in this study can estimate the workpiece''s shape and height on line in a relatively simple way. The time for every estimation is only 0.03 sec, and the estimation error is within 2mm. It is much better than other methods. The second part is focused on wire breakage problem from a viewpoint of discharge location concentration. Experiments are conducted with bad water flushing and over feed-rate in order to explore the gap situation before wire breakage. It is found that the breakage of wire is attributed to heavy thermal load caused by discharge location concentration and high abnormal ratio. The third part is to investigate the relationship between the distribution of discharge location and the characteristic of WEDM. The result of the experiment shows that, when the distribution of discharge is not uniform, it is likely to have a workpiece with less vertical straightness of machined part. Besides, this study also discusses the influence of feed-rate, discharge off time, and water pressure over the distribution of discharge location. The higher feed-rate or the smaller discharge off time will make the distribution of discharge location more uniform. Also, the smaller the lower water pressure is, the larger the discharge numbers in the lower location will be. Y. S. Liao 廖運炫 2001 學位論文 ; thesis 75 zh-TW
collection NDLTD
language zh-TW
format Others
sources NDLTD
description 碩士 === 國立臺灣大學 === 機械工程學研究所 === 89 === In this study, a discharge location detection system is designed and implemented based on the principle of discharge location detection. All the practical problems encountered, including EMI prevention, electrical circuit noises reduction and system calibration, are also discussed. With the use of this system, the research is divided into three parts. The first part is to estimate the workpiece''s shape and height by using the discharge location detection method. The method used in the past for estimating the workpiece''s height is rather complex and its validity is limited only to certain working conditions. In contrast, the method developed in this study can estimate the workpiece''s shape and height on line in a relatively simple way. The time for every estimation is only 0.03 sec, and the estimation error is within 2mm. It is much better than other methods. The second part is focused on wire breakage problem from a viewpoint of discharge location concentration. Experiments are conducted with bad water flushing and over feed-rate in order to explore the gap situation before wire breakage. It is found that the breakage of wire is attributed to heavy thermal load caused by discharge location concentration and high abnormal ratio. The third part is to investigate the relationship between the distribution of discharge location and the characteristic of WEDM. The result of the experiment shows that, when the distribution of discharge is not uniform, it is likely to have a workpiece with less vertical straightness of machined part. Besides, this study also discusses the influence of feed-rate, discharge off time, and water pressure over the distribution of discharge location. The higher feed-rate or the smaller discharge off time will make the distribution of discharge location more uniform. Also, the smaller the lower water pressure is, the larger the discharge numbers in the lower location will be.
author2 Y. S. Liao
author_facet Y. S. Liao
Ming-Tsong Hong
洪銘聰
author Ming-Tsong Hong
洪銘聰
spellingShingle Ming-Tsong Hong
洪銘聰
A Study of the Distribution of Discharge Location of WEDM
author_sort Ming-Tsong Hong
title A Study of the Distribution of Discharge Location of WEDM
title_short A Study of the Distribution of Discharge Location of WEDM
title_full A Study of the Distribution of Discharge Location of WEDM
title_fullStr A Study of the Distribution of Discharge Location of WEDM
title_full_unstemmed A Study of the Distribution of Discharge Location of WEDM
title_sort study of the distribution of discharge location of wedm
publishDate 2001
url http://ndltd.ncl.edu.tw/handle/55285699199478085532
work_keys_str_mv AT mingtsonghong astudyofthedistributionofdischargelocationofwedm
AT hóngmíngcōng astudyofthedistributionofdischargelocationofwedm
AT mingtsonghong xiànqiègēshìfàngdiànjiāgōngwedmfàngdiàndiǎnwèizhìfēnbùzhīyánjiū
AT hóngmíngcōng xiànqiègēshìfàngdiànjiāgōngwedmfàngdiàndiǎnwèizhìfēnbùzhīyánjiū
AT mingtsonghong studyofthedistributionofdischargelocationofwedm
AT hóngmíngcōng studyofthedistributionofdischargelocationofwedm
_version_ 1718334672915660800