ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

Manufacturing Processes - EDM Electrical Discharge Machining

Updated on October 15, 2014

Electrical Discharge Machining

Electrical Discharge Machining
Electrical Discharge Machining

The author focused on EDM fundamentals. These are the items common to all EDM machines, such as the spark, how the spark is controlled, what causes overcut, and the importance of the dielectric fluid.

 

Wire Electrical Discharge Machining

Wire Electrical Discharge Machining fits in the category of machining as a manufacturing process. It involves removal of material from a workpiece using spark discharges. This is achieved by connecting the workpiece and the electrode (sometimes in the form of a wire) to an electrical power supply. Clearly then the material for this process to work has to be electrically conductive.

On that basis it is primarily used to machine solid metallic components but in theory it could be used for any conductive material, and because of the nature of the process the hardness of the material is irrelevant.

As indicated the process isn't restricted to the use of a wire, in fact it is probably more common practice to simply bring an electrode, usually formed to the machined shape required, into close contact with the workpiece to generate a high voltage spark, which erodes the material.

The gap between the tool and the workpiece (sometimes known as the over burn) is kept constant by carefully controlling the position of the tooling. A dielectric fluid is flooded over the workpiece and the electrode at the point of contact, serving the purpose of cooling the vaporized material into chips that are flushed away to a filter. Alternatively the workpiece and electrode can be immersed in a bath of dielectric which serves the same purpose. The most common dielectric fluids used for electrical discharge machining are deionised water or light oils.

Note: the electrical field generated must be strong enough to break through the dielectric fluid in order for current to flow between the two electrodes.

Operating costs for the process could be considered to be expensive because dedicated tooling can have high wear rates and investing in electrical discharge machines is not a cheap option. In terms of setting up times, these are usually relatively short, the tooling is dedicated but fairly easy to change out.

The machined surface quality is rather dependent on the rate of material removal, the higher the rate the poorer the quality. Even the faster rates where surface quality is compromised slightly would be considered in general to be quite slow because the rate of material removal depends on the material properties such as latent heat and melting temperature.

It is possible to produce quite intricate shapes to met high tolerance specifications using this process and it is particularly useful for machining hard materials that would be difficult to machine using standard tooling used for single point or multipoint cutting and manufacturing processes.

The electrical discharge machining process has several aliases, it is also known as spark erosion, spark machining, die sinking and wire erosion. But essentially these are all variants of the same manufacturing process and are not to be confused with electrochemical machining.

Wire Electrical Discharge Machining

Electrical Discharge Machining (EDM)

EDM Electrical Discharge Machining

    0 of 8192 characters used
    Post Comment

    No comments yet.

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://hubpages.com/privacy-policy#gdpr

    Show Details
    Necessary
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Marketing
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Statistics
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)