Sun May 28 22:29:24 CST 2023
The quality of the electric pulse provided by the plastic mold is mainly the following two points:
Transient one-way pulse discharge. Spark discharge must be a kind of pulsed discharge that can be in the instantaneous, the discharge continues for a period of time after the need to stop for a period of time and then discharge, the discharge duration of about 10s. Because the discharge time is very short, so that the heat generated by the discharge can not be conducted and spread to the inside of the processed material, so that the energy effect is limited to a small range of non-stop processing discharge, to maintain the cold pole characteristics of the spark discharge (i.e., the discharge channel energy conversion of heat can not be transmitted to the electrode depth or the inside of the processed material), not only to ensure the processing of its good processing accuracy and surface of higher The quality of the machined part is ensured, and its inner quality is not affected by the pulse electrode. And in the successive two pulse discharge must have enough stopping time between, in order to avoid a variety of arcing, local burns and other phenomena. Otherwise, the surface of the die core will be completely destroyed like those who continuously let the arc discharge. For this reason EDM must use a special pulse power supply.
If there is an insulating liquid medium for injection molding. EDM must be carried out in a liquid medium (i.e. working fluid) with certain insulating properties. The working fluids commonly used for our electrode processing are kerosene, spark oil, deionized water, etc. The requirements of the liquid medium must have a high insulation strength, in order to facilitate the generation of certain pulsating spark discharge. At the same time, the liquid medium is required to enable the timely discharge of the galvanic corrosion products on the one hand, and to cool the workpiece on the other hand, so that the pulse discharge can be carried out smoothly. Only after the discharge of galvanic corrosion products to the discharge channel outside the timely discharge, the repetitive pulse discharge can be smoothly processed. In the actual production of EDM, the discharge of electro-etching products is mainly done through these two ways: on the one hand, the spark discharge and the electro-etching process itself has the inherent characteristic of discharging the etched products, and the rest of the discharge products other than the etched products (such as the vaporization of the liquid medium) can also have the ability to promote the above process; on the other hand, it is also necessary to make good use of some artificial auxiliary On the other hand, it is also necessary to make good use of some artificial auxiliary measures, such as the filtration of the working fluid for circulation, some flushing and oil pumping measures used in the process, etc.