On my drive to work (and anywhere else for that matter) I rarely think about how exactly my car works or all of the different parts that are required for it to function properly. I know there is a lot to it, and parts are manufactured in various places then sent to be assembled, but how do they make the parts? How much work is involved in each individual product? Most parts require quite a bit of work. One of the methods to make parts or the molds for parts is sinker EDM. It is used to make precise, complex parts for a variety of different industries, one of which is the automobile industry.
Sinker EDM can also be referred to as ram EDM or plunge EDM. It has the ability to work on three-dimensional as well as two-dimensional products. The process uses electrical discharge sparks to melt away metal. The sparks can generate heat from eight to twenty thousand degrees. The difference between sinker and wire EDM are the electrodes used. For sinker EDM processes, they are usually machined with graphite, copper tungsten, or brass electrodes. Further, while wire EDM requires a pre-drilled hole, sinker EDM does not. This allows it to produce more complex geometries. Finally it does not have to cut all the way through the metal allowing for even more variety in products.
This form of EDM is ideal for producing products such as injection mold tools, micro hole drills, keyways, washers and scientific research apparatus’. Like other methods of EDM, it is used a variety of different industries because of the clean, precise products it is able to produce. The products are free of burs which are common in other machine cutting processes; this alone is a very big advantage because it means it does not have to be re-machined after being cut. This is an advantage for the automotive industry because the fewer the mistakes on individual, the easier to ensure the overall car runs properly.