Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Mechanical and Marine Engineering | en_US |
| dc.contributor | Department of Manufacturing Engineering | en_US |
| dc.creator | Poon, Sui-kwong | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/3149 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | - |
| dc.rights | All rights reserved | en_US |
| dc.title | Achieving optimum machining accuracy in EDM die-sinking of particulate metal matrix composites | en_US |
| dcterms.abstract | An investigation has been made into the feasibility of using EDM die-sinking technique as an effective means of machining particulate metal matrix composites (MMC) with different silicon carbide content. An experimental design model, based on orthogonal arrays, is used to study a large number of control factors with a small number of experiments. Thus, the most economical process design can be accomplished at the smallest, affordable development cost. A practical way of developing the mathematical model leading to the finding of optimum parameter settings for producing the best possible precision machining results is presented. Verification experiments were also conducted to confirm the validity and predictive accuracy of the model. Electrical Discharge Machining, following a matrix experimental approach, was performed at a selected range of currents, pulse durations, pulse-off time and gap voltages with different combinations of tool materials and polarity. The measures of performance for the mathematical model are taken to be the relative wear rate, surface finish and metal removal rate. It is found that, in precision electrical discharge machining, copper electrodes perform better than graphite and tungsten-copper electrodes in terms of tool wear, and tools with positive polarity give higher material removal rate and lower tool wear ratio. The results of investigation also indicate that the higher the amount of silicon content in the MMC workpiece the more electrode wear will be induced. | en_US |
| dcterms.extent | [vi], 73, [22] leaves : ill. ; 30 cm | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 1993 | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.LCSH | Electric metal-cutting | en_US |
| dcterms.LCSH | Machining -- Mathematical models | en_US |
| dcterms.LCSH | Die-casting | en_US |
| dcterms.LCSH | Metallic composites | en_US |
| dcterms.LCSH | Hong Kong Polytechnic -- Dissertations | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b11247241.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.33 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/3149