Basic principle of the treatment of electric sparks
The principle of the treatment of electric sparks is based on the phenomenon of electromian corrosion of the pulse spark discharge between tools and parts (positive and negative electrodes) to erode excess metal to meet the treatment requirements to The size, shape and quality of the room.
The piece and tool electrodes are connected to the two different polarity electrodes respectively of the impulse power.
Tool electrodes are generally conductive, high metal points and easy -to -to -processes, such as copper, graphite, copper, tungsten alloy and molybdenum. During the processing process, the tool electrode is also lost, but the quantity of metal erosion in the part is even close to loss -free consumption.
As a discharge environment, the work solution also plays a role in cooling and crumbs during the processing process. The commonly used work fluids are low viscosity supports, a high flash point and stable performance, such as kerosene, ion water and emulsifier.
When the impulse voltage between the two electrodes is added, when the part and the electrode are kept, the piece and the electrode of the tool will be penetrated to form a discharge channel.
In the discharge channel, a high instantaneous temperature is generated, so that the surface materials of the part are melted or even gas. .
Once the pulse discharge is complete, after a period of time, the work fluid is isolated for insulation. The pulse tension acts several times on the part and the tool electrodes.
The Servo system constantly adjusts the relative position of the tool and part electrode, and feeds automatically to ensure that the pulse power is carried out normally until the required parts are processed.
1. Electric sparking training
The tool electrode is generally an electrode in the shape of copper or graphite, which can be an arbitrary form which can be manufactured, and the treated shape corresponds to the corresponding cavity.
2. Cutting and treatment of electric spray
The treatment of the cutting of electric flakes is divided into slow and fast wire.
Not only the surface of the room, but also its secondary surface when the treatment of the electric spark.
The impact layer of the treatment surface of the electric spark is shocked by the thrown melting metal and a small amount of electrode particles. This layer is easy to remove.
The next layer is a hard layer (oxidation layer). The treatment of electric sparks considerably modifies the metallurgical structure and the characteristics of the hard layer. Under the influence of the media oil, the melting metal was quickly cooled and the melting metal which was not thrown was solidified in the cavity to form a hard layer. The hard and crisp oxidation layer of this layer will appear slightly. If this layer is too thick, or it cannot be thinner or eliminated by polishing, this part may be damaged prematurely under certain conditions of use.
The last layer is the heating layer or the receipt. He was just heated and did not melt. The thickness of the hard layer and the heating layer is determined by the thermal dissipation capacity and the treatment energy of the room material. In any case, the modifiable metal layer will affect the original attributes of the part.
The automatic precision treatment circuit on the CNC Electro-Spark machine can effectively reduce the hard layer formation, but it still cannot eliminate the receipt.
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