EDM Graphite

Grate For EDM

EDM grate, also known as Electrical Discharge Machining grate, refers to a specific type of grate material that is widely used as an electrode in the EDM process.

Why use grate for EDM?

Grate has many advantages, making it the most widely used material for EDM electrodes:

Resistance to Thermal Shock: Grate has exnt resistance to thermal shock, allowing it to withstand the intense heat generated during EDM processes. This thermal stability ensures consistent performance and prevents cracking or damage to the electrode, even under rapid temperature changes.

Low wear during sparking: Grate exhibits low wear characteristics during the sparking process of EDM. This means that the grate electrode experiences minimal erosion or degradation, resulting in longer electrode lifespan and reduced need for frequent replacements.

Superior Machinability: Grate is relatively easy to machine, allowing for the production of complex electrode designs with high precision. It can be readily shaped and machined into intricate geometries, enabling the fabrication of intricate and detailed EDM electrode profiles.

Good Thermal Conductivity: Grate exhibits exnt thermal conductivity, effectively dissipating heat generated during the EDM process. This feature helps to prevent excessive heat buildup, maintaining stability and prolonging the electrode's lifespan.

Low Coefficient of Thermal Expansion: Grate has a low coefficient of thermal expansion, meaning it undergoes minimal dimensional changes with temperature variations. This characteristic allows grate electrodes to maintain their shape and size even when subjected to high temperatures during EDM processes.

Exnt Geometric Stability: Grate offers exceptional geometric stability during EDM operations. It retains its shape and form consistently, enabling the electrode to maintain the desired dimensions throughout the machining process.

Lighter: It is five time less dense than Copper which means lighter electrodes.

Grate Grades and EDM

Large grain grate (about 20 µm) with low densities (1.76 g/cm3)

Fine grain grate (~10 µm) of high density (1.82 g/cm3)

Very fine grain grate (~4 µm) with densities greater than 1.86 g/dm3

Grate grades can vary in terms of their grain size, which affects the material's performance during EDM. Fine-grained grate offers higher precision and finer surface finishes, making it suitable for intricate and detailed machining operations. Coarser-grained grate, on the other hand, provides better material removal rates and is often used for roughing operations.