Seibu's Fanuc control comes standard with Seibu's patented core stitch technology. Seibu’s core stitch welds the wire EDM cores (slugs) so they do not drop. Without core stitch, a tab is left uncut so the part does not drop. This tab also results in additional programming time. Eventually, each tab has to be cut off and the part removed from the work zone. The man hours for stopping the cut and collecting the cut off cores, & restarting the machine can add up. With Seibu’s core stitch technology, it is possible to remove all the cores at the same time. The cores can be removed by tapping lightly. Core Stitch drastically reduces the time for removing slugs and is standard on all Seibu wire EDM machines. An operator simply selects the core stitch feature on the Fanuc control and the software does the rest.
CORE STITCH is a registered trademark of Seibu Electric & Machinery Co., Ltd. Seibu wire EDMs are represented in the U.S. marketed by KGK International.
Hand scraping also known as Kisage is a manual process of using a flat scrapper in order to achieve a flat surface on a casting that is not possible with CNC machining. The hand scrapping process remove high spots left behind by during the machining. This requires skill and only a master craftsman can achieve its flatness. Hand scrapped surfaces provides smooth, gliding movement between a table and column that results stability, repeatability, improved part geometry and better surface finishes. Many machine tool builders have abandoned this manufacturing process because it reduces manufacturing cost or because they're unable to find a master scrapper. At Seibu, hand scrapping is perfomed all wire EDMs.
Tungsten Carbide is a hard material used to produce stamping dies and cutting. Tungsten Carbide contains tungsten (W) and cobalt (Co) which acts as a binder. The amount of cobalt is in the range of 5% to 25%. When wire EDMing carbide, the cobalt will start to dissolve due to oxidation caused by the dielectric fluid even while EDM is NOT taking place. The cobalt becomes weak due to the oxidation between cobalt the oxygen ions from the (dielectric water). The weakening of the cobalt reduces the life of the carbide tool resulting in fewer parts being produced. Only oil dielectric wire EDMs can totally eliminate all oxidation.
However Seibu’s EL Coating provides an alternative to EDMing carbide with water dielectric. Seibu’s EL coating covers the carbide surface with a 1 micron layer of brass on the final skim pass. To activate the EL Coating a simple M code is added to the CNC program. The thin brass coating increases the life of the carbide punches and dies resulting in increased production runs. Additionally, Seibu’s anti-electrolysis circuit reduces the amount of carbide micro-cracking / cobalt depletion during the wire EDM process resulting in longer carbide tool life. Seibu's fine finish circuit which is standard with the machine can produce a carbide surface finish down to 5RMS and eliminate wire lines on the part. Tthis fine finish eleimates hand polishing resulting in increased productivity.
Arrange a Free Wire EDM Carbide Test Cut
To prove that Seibu wire EDMs produce the best results when EDMing tungsten carbide, fill out the form on this page or call KGK International at 847-981-5626 to arrange a test cut.
The wire EDM market is quite competitive with many manufacturers to choose from but Seibu EDMs stand out from the competition since they are 100% made in Japan. These high quality wire EDMs come with a 17" dry annealing wire threader, pinpoint and repeatable machining accuracy, core stitch technology, and surfaces finishes down to 6RMS (carbide & steel). Although new to the U.S. market, Seibu developed the world's 1st wire EDM in 1972. Our machines are designed to last. We don't claim to be the biggest but we do claim to be the most precise and the highest quality wire EDM available.
Arrange a Test Cut Today
To prove that our machines can save you money and make you stand out from your competitors, click here or to arrange a test cut. Also click on the below image to watch our product video.
When EDMing multi parts, an uncut portion remains so the slug does not fall into the work tank. Slugs dropping into the work tank can result in scrapped parts, and machine damage resulting in downtime. Without core stitch, a tab is left uncut so the part does not drop. This tab also results in additional programming time. Eventually each tab has to be cut off and the part removed from the work zone. The man hours for stopping the cut and collecting the cut off cores, & restarting the machine can add up. With Seibu’s core stitch technology, it is possible to remove all the cores at the same time. Seibu’s core stitch welds the wire EDM cores (slugs) so they do not drop. The cores can be removed by tapping lightly. Core Stitch drastically reduces the time for removing slugs. For more info, watch the below video.
Wire EDMing is often considered a last machining method. Milling, turning and grinding are all more popular machining methods. The wire EDM market is smaller than chip making market. However in many cases when a mill, lathe or grinder can not machine a part, a wire EDM will often fill the void.