In metalworking, drilling process made by conventional drilling tools may cause many chip issues and the overheat problems that are always the key issues that obstacles the wanted precision and quality. Therefore, in the 1040s, industrial insiders started to study the application of some other methods to achieve this goal and EDM is the solution that satisfies them. Electrical discharge machining (EDM) is also well known as spark machining, spark eroding, burning, die sinking, wire burning, or wire erosion by industrial workers and people in different nations may have their own preferences.
EDM is a manufacturing process whereby a targeted shape of metal is obtained by using electrical discharges which normally cause sparks, as a result in the China market, it is also called the sparking machining. During the EDM machining, the unwanted metal materials are removed from the work piece by a series of rapidly recurring current. Considering all the other components, one of the critical electrodes is called the tool-electrode.
Even though EDM is a wide spectrum inventory, there are some most commonly adopted methods that are used in the industry for precision processing. It is recognized that the term micro machining refers to the machining process that utilizes tools smaller than 0.015 inch in diameter, and the tolerances are also of certain standards. To achieve micro machining, it takes specific spindle speeds to utilize the small-diameter tools, and the machinery has to be very precise and accurate. Therefore, in the application of the EDM machines, there are many industries now require precision EDM micro machining to micron-level tolerances and standards.
With this practical application bearing in mind, the inception of micro machining center has the machines and engineering services that meet these exacting standards. Many EDM micro machining centers are equipped with features such as advanced spindle temperature control function, unique EDM advancements, as well as rigid machine construction. They can achieve a lot of things such as high speed machining and great and accurate repeatability. For the extension of the EDM machines, the history of wire-cut type EDM machine arose in the late 1960s for the purpose of making tools and dies from hardened steel. The earliest numerical controlled (NC) machine tools were conversions of punched-tape vertical milling machines. The first commercially available NC machinery built as a wire-cut EDM machine was manufactured in the USSR in Russia during the era of late 1960s in which the processing of aerospace, military and defense, automotive were growing.
In fact, the methods that can achieve micro machining are many, while there are mainly two ways of methodologies. The first one is of EDM machining, that is the electrical discharge machining method, while the other is the more traditional, metal to metal cutting process. Either way, the demand for the work piece results by customers are basically the same, so manufacturers have to cope with different kind of processing difficulties in order to keep up with the processing standard and practical circumstances. Furthermore, machining is actually a wider concept in metal working industry, which actually includes processes such as cutting, drilling facing, knurling, deformation, sanding, turning, milling, and other processing procedures.
As a result, beside the two above mentioned technology and methods, there are still some other machinery suppliers that offer other methods for micro machining, such as sub contract micro drilling based on laser micro hole drilling. Laser technology nowadays is very mature now and has been applied to a variety of industrial applications. In machining, a laser is equipment that emits light through a process of optical amplification which is based on the stimulated emission of electromagnetic radiation. This term "laser" is originated from an acronym for Light Amplification by Stimulated Emission of Radiation. The first laser was constructed in the 1960s at the famous Hughes Research Laboratories, based on the theoretical work by Charles Hard Townes and Arthur Leonard Schawlow. These are excellent scientists as well as engineers who are with great originality.
A laser is different from other sources of light in that laser emits light which is coherent, and the spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting application and lithography printing. In sum, lasers are different from other light sources by their coherence nature. Spatial coherence is typically expressed via the output being a narrow beam, that is diffraction limited, and laser beams can be focused to very tiny spots, offering a very high irradiance, or they can have very low divergence to concentrate their power at a great distance, promising advanced processing quality.
In addition, temporal coherence implies a polarized wave at a single frequency, and whose phase is correlated over a relatively great distance along the beam itself. Besides, a beam produced by a thermal or other incoherent light source has an instantaneous amplitude and phase that vary randomly with respect to time and position, so it has a short coherence length. After the invention of laser technology, the structure of metal working has been changed and metal cutting can be achieved much faster within a short period of time without further tool wore out issues and other traditional tooling issues.
At the same time, at the same time, the way people use energy has been changed since this technology, so the corresponding management is also improved in order to keep up with this innovative technology. Meanwhile, the technology of EDM is also another invention occurred in the 20th century. In the metal working industry, electrical discharge machining (EDM) is also known as spark machining, spark eroding, burning, die sinking, wire burning or wire erosion.
In the Chinese-speaking society, it is a manufacturing process whereby a targeted shape is obtained by using electrical discharges which normally cause sparks, accordingly in Chinese it is also called the sparking machining. During the machining, unwanted materials are removed from the work piece by a series of rapidly recurring current. Among the components, one of the electrodes is called the tool-electrode, and the other is called the work piece-electrode. The machining process is determined by the tool and work piece which would not make actual contact. There are several types of EDM processing nowadays and here in the section we discuss one type which is largely adopted in the manufacturing of household appliances, filter nets, 3C electric consumables, and other smaller sized work pieces with rigid precision requests.
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