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The Basic Principle Of WEDM

Nov. 13, 2019

According to the form of the tool electrode and the relative movement between the workpiece and the workpiece, the EDM can be divided into MS-WEDM, small hole machining, Other types of processing such as surface alloying and surface strengthening.

When performing EDM, the tool electrode and the workpiece are respectively connected to the two poles of the pulse power source, and immersed in the working fluid, or the working fluid is charged into the discharge gap. The tool control tool electrode is fed to the workpiece through the gap automatic control system. When the gap between the two electrodes reaches a certain distance, the pulse voltage applied on the two electrodes breaks down the working fluid to generate a spark discharge.

Instantly concentrating a large amount of thermal energy in the fine passage of the discharge, the temperature can be as high as 10,000 degrees Celsius or more, and the pressure also changes drastically, so that the local trace amount of the metal material on the working surface is immediately melted, vaporized, and explosively splashed into the working fluid. Medium, rapidly condensing, forming solid metal particles, which are carried away by the working fluid. At this time, a slight pit mark is left on the surface of the workpiece, the discharge is short, and the working fluid between the two electrodes is restored to the insulation state. The next pulse voltage is again broken down at another point where the two electrodes are relatively close, generating a spark discharge, and the above process is repeated. Thus, although the amount of metal etched by each pulse discharge is extremely small, since there are tens of thousands of pulse discharges per second, more metal can be etched, which has a certain productivity. Under the condition of maintaining a constant discharge gap between the tool electrode and the workpiece, the tool electrode is continuously fed to the workpiece while the workpiece metal is being etched, and finally the shape corresponding to the shape of the tool electrode is processed.

The Wire Cut Machine Tool method can adapt to the needs of production development and shows many excellent performances in the application. Therefore, it has been rapidly developed and widely used.

Wire Cut Machine Tool

Wire Cut Machine Tool 

Wire cutting is mainly used for processing various shapes and delicate workpieces. It has outstanding advantages such as small machining allowance, high machining precision, short production cycle and low manufacturing cost. Wire cutting has been widely used in production. The processing of wire cutting is as follows.

High-speed stable cutting: High peak current is selected and the current is cut with a longer pulse width to obtain a higher cutting speed. The compensation amount of the center track of the wire is small, and the selection of the wire will affect the speed of the second cutting. It is difficult to eliminate the trace of the first cutting. The wire-feeding method adopts high-speed wire-feeding, and the wire-cutting speed is 8~12m/s, which achieves the maximum processing efficiency.

Intensive repair to ensure the dimensional accuracy of the processing: the pulse parameters are selected to be medium gauge, so that the roughness Ra after the second cutting is between 1.4 and 1.7 μm. The compensation amount f, because the second cutting is finishing, the discharge gap is small, the δ is less than 0.01mm, and the processing quality required for the third cutting is very small, only a few microns, the two add up to about 0.01 Mm. Therefore, the compensation amount f of the second cutting can be about 1/2d + 0.01mm. In the wire-traveling method, in order to achieve the purpose of finishing, the low-speed wire-feeding method is usually adopted, the wire-cutting speed is 1~3m/s, and the tracking feed rate is limited to a certain range to eliminate the round-trip cutting stripe and obtain the required Processing dimensional accuracy.

Polishing: Polishing with a minimum pulse width, and peak current varies with the quality of the machined surface. Theoretically, the radius of the wire is added with a discharge gap of 0.003 mm. In fact, the finishing process is an electric spark grinding process with a small amount of machining and does not change the size of the workpiece. Therefore, the ideal effect can be obtained by simply using the radius of the electrode as a compensation amount. The wire-traveling method can be fed at a low-speed wire-speed limit speed like the second cutting.

Punch processing: The punch plays an important role in the mold. Its design shape, dimensional accuracy and material hardness directly affect the punching quality, service life and precision of the stamping. The cutting route should be beneficial to ensure that the workpiece is always in the same coordinate system as the fixture (clamping support frame) during the machining process, avoiding the influence of stress deformation.

The above is the description of the Wire Cutting Machine EDM supplier and everyone, I hope to help everyone.

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