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2 types of Electrode Processing In the Mold EDM Electrode ProcessingThe electric discharge machine electrode processing is an advanced metal processing machine tool, without machining residual stress, and can process workpieces that have been heat-treated and cannot be processed by ordinary tools. Electric discharge machining is also called EDM. When the electrode processing place is deep and narrow, and the tool cannot cut it, it can be processed by EMD which belongs to a kind of electrode processing. Electrode processing: It can be processed with copper grade wire and graphite electrode, copper can be etched, graphite can be etched copper and beryllium copper, and graphite can be etched black copper. In addition, steel can corrode steel, and black copper can corrode graphite, but the processing volume should not be too much, it can only corrode about 0.05~0.1mm. If the amount of processing is large and the processing takes a long time, copper electrodes should be used. EDM electrode processing fixtures: Light force disks, screws, weight irons (EROWA), and collets of different sizes. Equipment components: The spark machine can be divided into manual, CNC machine (fully computerized), ATC device (automatic electrode change device), and C-axis (rotor device). Electrode spark position setting: There are several types of extra-coarse electrodes, rough-machining electrodes, finishing electrodes, and skin-grain electrodes. Generally, the spark position varies from 0.1 to 1 mm in diameter, depending on the size and depth of the workpiece, and pay attention to the smoothness requirements. Electrode processing repair: If the carbon and red copper electrodes are damaged, they can be repaired by the mosaic method according to the different shapes of the electrodes (depending on the shape). Graphite category: ISO 63, 88; POCO 100, 200; POCO AF-5; EDM 100, 200; EDM3. For rough machining: POCO 100, EDM100. For finishing machining: ISO 63, POCO 200. Strand common: ISO 88, POCO200, EDM3.
Place the workpiece on the light force disk or the plane of the workbench, tighten it with coded iron screws, calibrate the datum plane with a dial indicator, touch the datum plane with an electrode, move along the X and Y axes, according to the drawings, and add Reduce the spark feed depth, adjust the depth, press the start switch, the EDM machine has different processing conditions, and it is selected according to the requirements of the workpiece.
The spark position difference between the rough male and the young male is that the spark position during the rough male machining is typically a little pre-fine 0.05mm is used for the young male processing. This is due to the relatively large spark position required for rough machining.
It is processed according to the requirements of the finish of the finished product, and the size generally needs to be pre-polished. If the precision of the mold frame is high, finishing machining is required, and polishing is easier, saving polishing time. It is easier to polish large mold parts, and the precision of EDM does not need to be too high, which saves the time of EDM machining.
Commonly used working fluids include kerosene, engine oil, deionized water, emulsion, etc. Its function is to compress the area of the discharge channel domain, increase the discharge energy density and accelerate the discharge of corrosion products. The electrode can be drilled to flush or absorb liquid, but the hole should not be too large, otherwise, a little protruding steel will be left on the processed surface to be reprocessed. At the same time, it should be noted that if the beryllium copper is inlaid in the inner mold insert and processed by electric corrosion, the copper chips generated during processing will bounce to the processing surface, resulting in rough lines. At this time, the washing speed of the working fluid should be increased.  Wire Cutting Electrode ProcessingWire-cutting electrode processing, also known as WEDM, has the same processing principle as EDM, except that the electrodes are replaced with molybdenum wires. it also belongs to a kind of electrode processing.
Resin, cutting copper wire, plated copper wire, filter, water, bearings, conductors, wire nipples, oilstone, de-rusting water, antirust oil (add after using the de-rusting water), machine line oil (snow oil ).
Yard iron, stainless steel screws, a special second batch for wire cutters, and a variety of chucks from EROWA.
The function of the resin is to purify the electric ions in the water and reduce the conductivity of the water. When the scale of the Mitsubishi machine is below 25 degrees, the Western machine will operate normally below 200 degrees. If it is higher than this scale, it is necessary to refill the resin, and generally change the water or replace the filter.
There are ordinary wires, coated wires, and special cutting wires made by manufacturers for various brands of machines. The diameter is generally 0.10~0.30mm.
The V-shaped fixture, which is extremely precise and cannot be eccentric, is mounted on the spherical workpiece. A hole can be made in the workpiece using a steel plate, after which the circular workpiece is inserted and treated. Batch clamping is an option for small workpieces. The huge workpiece is clamped with a yard iron or an EROWA head for processing after being laid flat on the platform. Chucks are all constructed from stainless steel. 
After the position of the cutting line is adjusted, it is stored in the computer for processing according to the required size of the drawing, and the computer will automatically calculate the spark gap to set the contact discharge distance between the line and the workpiece. In addition, due to the presence of sparks, the minimum rounded corner R cut cannot be smaller than the radius of the line. Example 1: If you want to ensure that the size is 10mm, and the line thickness is φ0.25mm, you need to move 10.125mm after touching the number, depending on the accuracy requirements. Example 2: When cutting a hole with a diameter of φ5mm, when the cutting line touches the reference edge of the workpiece, move “10.0mm+line radius” in the X and Y directions respectively. When the diameter of the cutting line is φ0.25mm, the radius is 0.125mm, and the cutting line is along X, Y axis moves 10.125mm. If the size is to be very accurate, it needs to be completed 3~4 times from the beginning of rough machining. Example 3: When the cutting line touches the reference edge and sees sparks, it moves 25mm+cutting line diameter φ0.25mm. |
