Eedm die sinking product

The EDM in accordance with the form of the tool electrode and its relative motion between the workpiece features can be divided into EDM; EDM; EDM grinding; EDM conjugate gyratory processing; hole machining, Surface alloying, surface hardening and other types of processing.
For EDM, the tool electrode and the workpiece are connected to the poles of the pulse power supply, and immersed in the working fluid, or the working fluid into the discharge gap. Through the gap automatic control system to control the tool electrode feed to the workpiece, when the gap between the two electrodes to reach a certain distance, the pulse voltage applied to the two electrodes breakdown of the working fluid, resulting in spark discharge.
In the discharge of the fine channel instantaneous concentration of a large number of thermal energy, the temperature can be as high as 10,000 degrees Celsius, the pressure has also drastic changes, so that this part of the work surface local trace of the metal material immediately melting, gasification and explosive splash to the working fluid In the rapid condensation, the formation of solid metal particles, the working fluid away. At this time left in the workpiece surface will leave a small pit marks, discharge a brief pause, the working fluid between the two electrodes to restore insulation. The next pulse voltage breaks down at another point where the two electrodes are relatively close to each other to generate a spark discharge and the above process is repeated. In this way, although the amount of metal removed by each pulse discharge is very small, more metals can be removed due to thousands of pulse discharges per second, resulting in a certain productivity. The tool electrode is continuously fed to the workpiece while the workpiece metal is being etched while maintaining a constant discharge gap between the tool electrode and the workpiece, and finally the shape corresponding to the shape of the tool electrode is machined.
EDM to adapt to the needs of the development of production, and in the application shows a lot of excellent performance, therefore, has been rapid development and increasingly widespread application.
Wire cutting is mainly used to process a variety of complex shapes and small precision parts, with a small allowance, high precision, short production cycle, low manufacturing costs and other prominent advantages, wire cutting has been widely used in production. Wire cutting process is as follows.
High-speed stable cutting: Use high peak current, longer pulse width for high-current cutting, in order to obtain higher cutting speed. The compensation of the center wire of the wire electrode is small. Selecting the bigger one will affect the speed of the second cutting. It is difficult to eliminate the marks of the first cutting if it is small. Take the silk way to take the high-speed silk, take silk speed 8 ~ 12m / s, to achieve the maximum processing efficiency.
Precision, to ensure the accuracy of processing size: pulse parameters selected medium standards, so that after the second cutting roughness Ra between 1.4 ~ 1.7μm. The amount of compensation f, because the second cut is refined, the discharge gap smaller, δ less than 0.01mm, and the third cut required processing quality is very small, only a few microns, the sum of the two is about 0.01 mm. Therefore, the second cut compensation f can be about 1 / 2d +0.01 mm can be. Take the silk way, in order to achieve the purpose of finishing, usually using low-speed silk way, take silk speed of 1 ~ 3m / s, and tracking the feed rate is limited within a certain range to eliminate the back and forth cutting stripes and get the required Processing size accuracy.
Polish polishing: the minimum pulse width for light, while the peak current with the processing of surface quality requirements vary. Theoretically the radius of the wire plus 0.003mm discharge gap, in fact, the process of finishing is a kind of EDM grinding, the amount of processing is very small, will not change the size of the workpiece size. Therefore, only the radius of the electrode as a compensation amount can achieve the desired effect. Take the wire way as the second cut as low-speed wire feeding speed can be.
Punching process: punch in the mold plays a very important role, its design shape, dimensional accuracy and material hardness have a direct impact on the quality of punching mold, life and precision stamping parts. Cutting route should be conducive to ensure that the workpiece is always in the process of processing and fixture (clamping support) to maintain the same coordinate system, to avoid the impact of stress and deformation.