EDM graphite processing parameter setting
First, the basic principle of EDM.
EDM is a special processing method that uses spark discharge to corrode materials. The basic principle is to use the electrocorrosive effect of pulse discharge to cut, form and contour the workpiece. During the discharge process, the impulse voltage is applied between the electrode and the workpiece, and the gap impedance between the poles has an effect on the properties of the applied voltage, so that the heat generated during discharge and the duration of the discharge are also different. The duration of discharge determines the degree of removal of the electrode material, therefore, the control of the discharge time is an important factor affecting the processing quality.
2. EDM graphite processing parameter setting.
1.Pulse width and pulse interval.
The pulse width is the duration of each discharge, which determines the depth of the galvanic erosion. In general, as the pulse width increases, the processing depth increases. However, the processing speed slows down and the electrode losses increase. Therefore, it is important to choose the right pulse width. The pulse interval determines the number of pulse discharges, which has a great impact on machining accuracy and surface roughness. In general, as the pulse interval decreases, the machining accuracy and surface quality improve, and the machining speed slows down.
2.Peak voltage.
The peak voltage is the minimum voltage applied between the electrode and the workpiece. The magnitude of the peak voltage depends on parameters such as the distance between the poles, the resistivity of the operating fluid, and the polarization index. In general, the higher the peak voltage, the stronger the discharge energy and the faster the processing speed. However, too high may cause undesirable consequences such as short circuits or open circuits. Therefore, it is necessary to select the appropriate peak voltage according to the actual situation.
3.Working fluids.
The main functions of the working fluid are to transfer impulses, cool and evacuate chips. The type of working fluid, viscosity, temperature, etc. will affect the processing effect. Generally speaking, the use of conductive working fluids with higher purity can achieve better processing results.
4.Polarity effects.
In EDM, the electrode discharge effect of different materials is affected by polar effects. When processing different materials, the appropriate electrode material and polarity should be selected to ensure good processing results.
Third, the principle of parameter adjustment.
When EDM graphite is processed, it is necessary to select the appropriate parameters according to the material, size, accuracy requirements and other factors of the workpiece. In general, the following principles need to be followed:
1.First, set the parameters according to the experience, carry out trial cutting, and observe the cutting effect
2.Adjust the parameters according to the cutting effect until the best results are achieved;
3.On the premise of ensuring the processing quality, try to choose a larger pulse width and a smaller pulse interval;
4.Flexible adjustment of parameters according to the actual production situation to obtain the best processing results;
5.In the production process, we should pay attention to safety, ensure the operation specifications, and avoid accidents.
In a word, reasonable EDM graphite processing parameter setting is one of the key factors to ensure the processing quality. In actual production, the parameters need to be flexibly adjusted according to the specific situation to achieve the best processing results. At the same time, it is also necessary to pay attention to safe operation specifications to ensure production safety.