EDM - the key to better electrode making

Smooth out the process, eliminate unnecessary steps, reduce errors and automate repeat work by using a single piece of software throughout electrode design and manufacture.

Creating and using electro discharge manufacturing (EDM) electrodes is considered a painful challenge by most mould makers because it is time consuming, slows down mould production and requires precision.

Given the option, most toolmakers would rather mill the steel and avoid electrodes altogether.

Nevertheless, electrodes are still required for a good portion of mould making jobs with some moulds requiring many electrodes.

Parts with narrow ribs and sharp internal corners are good examples for such cases.

As a result, mould makers are constantly searching for processes and technologies to ease the pain of creating electrodes.

Dedicated electrode design and manufacturing software is one answer.

In traditional mould making practices, electrode design is typically the last step in the mould design process.

Using concurrent engineering, electrode design can be performed in parallel to the splitting of core and cavity.

Multiple users can work concurrently on the same project, thereby expediting the mould design process.

With the many steps involved in the electrode design process, even the most experienced users can use some help and guidance, and novice users can get up to speed quicker if taken through the process step-by-step.

A software wizard can do just that, assisting a user in the many steps involved: selecting the electrode area, extracting the electrode surfaces, developing extension surfaces, selecting a blank, base and holder, creating a boundary, determining burn locations and creating inspection drawings.

Software can also help avoid some of the tedious and time-consuming details involved in the electrode design.

Automation not only helps a toolmaker get the electrode done quicker, but also ensures greater levels of accuracy and consistency, and with fewer errors.

For example, the software should be able to find a base and automatically extend the electrode to interface with the holder.

Automatic extraction of the electrode surfaces is another function that can benefit users.

The software should dynamically position and rotate blanks to determine burn areas and then automatically fit each blank to the selected burn area.

To save time and resources in creating accurate documentation, the electrode software should automate the tedious task of drafting and documenting the electrode process.

Although each mould and electrode could be different, there is a great deal of repetition that can be avoided by saving common tasks and processes as templates for future use.

For example, the process described above for extending the surfaces can be saved as a template with different templates for different electrode contours.

Templates also can be used to generate assembly, inspection and burning location drawings.

Using one piece of software throughout the electrode design and manufacturing process - electrode creation and drawing, customisable electrode reports, seamless integration to NC and automatic programming for an EDM - can go a long way to smooth out the process and eliminate unnecessary steps and data transfers and reduce the probability of errors and repeat work.

Integrated design and manufacturing electrode software should automate the electrode production process while providing complete control over all machining and burning parameters.

To maintain flexibility, the system should allow the definition of general and machine-specific parameters, electrodes and burning locations.

To ensure the information is communicated accurately to the shop floor, the software should provide set-up sheets, including detailed instructions as required by the machine operators.

The best software will provide direct interface of the set-up data to the EDM machine, avoiding operator errors and speeding up the set-up process.

Support for high-speed milling is a must for most tool shops these days.

To ensure a streamlined production process, the software should automatically generate the most efficient toolpaths, using continuously updated knowledge of actual remaining stock.

No matter what level of functionality the software offers, it has little value unless properly used.

Some users may be reluctant to use automatic functions and templates, fearing they may lose control over the process and its results.

Tool shop executives can address such user concerns on three levels.

First, technology: the software must allow users to do things their way even if there is a better and quicker way for accomplishing the task.

Users always must have the ability to override system defaults, modify templates and manually execute specific tasks.

Secondly, training: too often a software package is thrown at the users without proper training.

Always pressed for time, users may feel that self-training is an acceptable shortcut.

This, however, typically ends up causing users to spend valuable time trying to figure things out on their own, lengthening the learning curve beyond what is necessary.

Moreover, lacking proper training, users may never use the full potential of the software, sacrificing long-term productivity for short-lived budget and time savings.

Thirdly, without proper support, users may end up struggling with software issues instead of getting their jobs done.

To avoid such productivity loss, tool shop managers need to consider the vendor's support capability when evaluating an electrode software package.

With the proper processes, people and technology in place, what used to be a painful task can become more efficient, manageable, and better integrated into the entire tool design and creation process.

This article was written by Hari Sridharan, Director of Engineering at Cimatron Technologies.

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