A Basic Overview of EDM Die Sinking and Its Associated Benefits

07 April 2022

When processing metal materials, manufacturers would often opt for machining to generate excellent parts and products. Through various machining processes, manufacturers can utilise special machines and tools to cut workpieces with their desired shape and size.

As technology advances, most of the machining processes today have been automated. Through computer numerical control (CNC) machines and tools, the processes can now be carried out even without manual movements from operators. Instead, they move through the instructions sent by the software from a computer. The operations of lathes, grinders, turning mills, and other machining tools have been significantly improved by CNC technology.

One particular process that has benefitted from the rise of CNC technology is the electrical discharge machining (EDM) die sinking process.

An Overview of EDM Die Sinking

EDM die sinking is a machining process wherein the electrode is placed near a workpiece, generating dies or moulds. What makes EDM die sinking different from other machining processes is its tool does not require direct contact with the workpieces. Instead, placing the electrode or the working tool near the workpiece can already create the size and shape of the die or mould. The electrode is powered by electricity, which is the same energy source for other machining tools and machines.

EDM Die Sinking Key Processes

The EDM die sinking process starts by immersing the electrode and the workpiece into the liquid. The electrode is then connected to a power supply so it can generate the needed electric voltage. Relying on the set parameters on the controller, the power supply will turn on and off automatically. As the power source is turned on, it can help establish the interaction between the electrode and the workpiece.

As the electrode and the workpiece become close, the electric voltage from the former will be discharged, releasing numerous sparks one after another in just a few seconds. The sparks can then gradually form the specifications of the cavity in the die or mould.

The workpiece’s base material is then expected to erode as the spark gap increases. The electrode is likewise lowered so that the EDM die sinking can continue without any problems. Once the shape of the die or mould has been created, the die sinking process is ultimately finished.

EDM Die Sinking Primary Benefits

Many manufacturers opt for EDM die sinking due to the benefits it can bring.

For one, EDM die sinking is flexible. Since workpieces are machined without direct contact, EDM die sinking can easily process materials that are delicate and fragile.

Another benefit of EDM die sinking is it is versatile. The whole process of EDM die sinking relies heavily on the sparks. Fortunately, the shapes that the sparks can create could be broader compared to the ones created by other processes. Additionally, the electric voltage of the electrodes can vary, making it possible for the process to handle extremely hard materials.

EDM die sinking can likewise achieve smooth finishes and small, deep cavities due to the nature of its basic working principles.

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