Die Sinking EDM
Electric Discharge Machine
Electrical Discharge Machine(EDM), Die-sinking EDM, also called cavity type EDM or volume EDM, consists of an electrode and workpiece submerged in an insulating liquid such as, more typically, oil or, less frequently, other dielectric fluids. The electrode and workpiece are connected to a suitable power supply. The power supply generates an electrical potential between the two parts. As the electrode approaches the workpiece, dielectric breakdown occurs in the fluid, forming a plasma channel, and a small spark jumps.
These sparks usually strike one at a time because it is very unlikely that different locations in the inter-electrode space have the identical local electrical characteristics which would enable a spark to occur simultaneously in all such locations. These sparks happen in huge numbers at seemingly random locations between the electrode and the workpiece. As the base metal is eroded, and the spark gap subsequently increased, the electrode is lowered automatically by the machine so that the process can continue uninterrupted. Several hundred thousand sparks occur per second, with the actual duty cycle carefully controlled by the setup parameters. These controlling cycles are sometimes known as "on time" and "off time". The on time setting determines the length or duration of the spark. Hence, a longer on time produces a deeper cavity for that spark and all subsequent sparks for that cycle, creating a rougher finish on the workpiece. The reverse is true for a shorter on time. Off time is the period of time that one spark is replaced by another. A longer off time, for example, allows the flushing of dielectric fluid through a nozzle to clean out the eroded debris, thereby avoiding a short circuit. These settings can be maintained in microseconds. The typical part geometry is a complex 3D shape, often with small or odd shaped angles. Vertical, orbital, vectorial, directional, helical, conical, rotational, spin and indexing machining cycles are also used.Some of the advantages of EDM include machining of:
- Complex shapes that would otherwise be difficult to produce with conventional cutting tools.
- Extremely hard material to very close tolerances.
- Very small work pieces where conventional cutting tools may damage the part from excess cutting tool pressure.
- There is no direct contact between tool and work piece. Therefore delicate sections and weak materials can be machined without any distortion.
- A good surface finish can be obtained.
- very fine holes can be drilled.
- The slow rate of material removal.
- Potential fire hazard associated with use of combustible oil based dielectrics.
- The additional time and cost used for creating electrodes for ram/sinker EDM.
- Specific power consumption is very high.
- Power consumption is high.
- Electrically non-conductive materials can be machined only with specific set-up of the process.
- Taipei Int'l Mold & Die Industry Fair (2018)
From August 29 to September 1, 2018 of Taipei Int’l Mold & Die Industry Fair,Read More
Co-organized by Taiwan Mould Association / Taiwan Additive Manufacturing Association / Chan Chao International...
- Aerospace Machining Exhibition (2018) (Transferred to Taichung Industrial Automation Exhibition 2019)
From July 5th to 9th, 2018, Aerospace Machining Exhibition was the only aerospace exhibition in Taiwan. The organizer is the United Daily News Economic Daily. The exhibition location is at the "Taichung...Read More
- International Exhibition Catalogue Exhibition in Thailand (2018)
YIHAWJET participate in the " 2018 INTERMACH &SUBCON catalogue Exhibition " through Taiwan External Trade Development Council (TAITRA) to promote EDM machines. Exhibition Date&Location:...Read More