EDM Machining Operating Principle
What is EDM Machining?
Electrical discharge machining, EDM, is a manufacturing process where material is removed from a workpiece using a rapid sequence of electrical current discharges between electrodes submerged in a dielectric liquid. The process is used to manufacture parts that are impossible to machine. Since EDM does not use mechanical force to remove material, it is considered to be non-traditional.
EDM is an exceptionally precise process that is ideal for forming complex and intricate shapes and is capable of shaping hard metals such as titanium. The materials shaped using EDM must be electrically conductive for the process to be successful.
The workpiece electrode, anode, of an EDM machine is connected to the positive terminal of a DC power supply while the tool electrode, cathode, is connected to the negative terminal. The electrodes are submerged in the dielectric fluid and separated by the spark gap. Sparking generates extreme electrothermal heat in the spark gap zone, which melts and vaporizes parts of the workpiece surface, a process known as spark erosion.
The EDM wire machining process, an alternative to sinker EDM machining, works much like a wood band saw using a wire for the cutting process. The wire, made of copper or brass, has a high voltage electrical discharge passed through it that makes it possible for the wire to cut through the thickness of the workpiece.
The wire in EDM wire machining creates a spark in deionized water where conductivity is precision controlled. The water cools the material and washes away the removed material with clean dielectric fluid being constantly pumped into the process to flush the excess waste away.
The extreme temperatures of the EDM process rapidly removes excess material from the workpiece by vaporization and melting or spark erosion. The molten metal is partially removed. As the electric potential is withdrawn, the plasma channel is no longer sustained and generates pressure or shock waves as it collapses. This evacuates the molten material forming a crater of material that is removed from around the spark site.
Material is removed by the formation of shock waves as the plasma channel collapses due to electric potential discontinuation where the work material is made positive and the tool negative. As the electrons strike the workpiece, craters are formed by the heating, melting, and removal of material as positive ions strike the tool resulting in tool wear.
Electrical discharge machining requires a great deal of power. Generators used for the process must be capable of supplying the necessary power in order for the process to run efficiently and successfully. They are selected in accordance with their ability to generate the power parameters of the process.
EDM (DIE SINKER)/WIRE EDM machine tools are widely used in various industries, such as Digital home appliances, automotive manufacturing, medical equipment, semiconductor packaging, mold industry, aerospace, aluminum industry, bathroom fixtures, military manufacturing, etc
SUZHOU HANQI CNC EQUIPMENT CO.,LTD. was established in 2005, specializing in the production and customization of various precision CNC electric discharge machines(EDM) and CNC wire EDM cutting machines(WEDM) for over 30 years. Machine tool castings, same as Swiss brand, have undergone all major component inspections using German Zeiss coordinate tester and have collaborated with Swiss technology to ensure the precision and stability of EDM machines. Hanqi CNC machines(EDM/WEDM) are widely used in various industries, including mold manufacturing, automotive manufacturing, chip technology, medical equipment, electronics, electrical, hardware, plastics, etc. Hanqi CNC has cooperated with several world-renowned brands, including THK, Philips, Siemens, Panasonic, HIWIN, PMI, NSK, BYD, GCL, Chint, MIDEA, Mitsubishi Electric, GREE, GIANT, Zhongwang, FAGOR, FUJI, SAIC GM, CATL, Konka, Galanz, LUXSHARE ICT, Foxconn, FANUC,KNUTH etc. Our factory has relevant international authoritative certifications such as ISO9001, IS014001, CE, UL, ETL, etc. Our products have high cost-effectiveness and have been exported to more than 30 countries and regions around the world. With high-quality and high-precision machine tools (Industry leading in MS-WEDM/EDM machining accuracy), we can process very complex components and have been favored by customers from various countries, thus accumulating a large number of high-quality domestic and foreign long-term cooperative customers.
Frequently Asked Questions
Q: Are you manufacturer or distributor?
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A: We are manufacturer, welcome to visit our factory.
Q: How to choose the machine I want?
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A: Firstly, please correspond to the worktable travel and cutting thickness according to the size of the workpiece to find a suitable model; Secondly, please check if precision and roughness meet your requirements.
Q: Our country's voltage is three-phase 220V(or single phase 220V,or other voltage), machine's voltage is three-phase 380V, can you change the voltage?
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A: Yes, please tell me the voltage you need, we will change it.
Q: How can I get technical support if I buy your machine?
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A: We have detailed Installation manual/operation manual/instructional videos, even if novices can operate by watching the videos.
Q: How about after-sales service?
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A: Free replacement of damaged parts during the warranty period, replacement at cost price after the warranty period;
Any problems, we will provide you with solutions quickly by shooting videos or other ways.
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