How to use wire cut EDM cutting Aluminum, Copper, Carbon Steel and Stainless Steel?

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Wire cut EDM processing is an electrical discharge technology, which is the abbreviation of Wire EDM. It is commonly used in metal molds. The electrode is a thin copper or molybdenum wire. So it can be turned in any direction during the cutting. Any shape of workpiece can be cut by Wire Cut EDM. At present, wire cutting mostly relies on the similar arc discharge phenomenon to dissolve the metal, so as to achieve the cutting effect. Therefore, wire cutting can only be applied to metals or semi-conductors. Wire cutting generally has the following process: first, formulate the process route, then select the processing benchmark of the workpiece, and then determine the threading hole, starting point and cutting route. This article mainly introduces some materials that can be processed by wire cutting.

1. Aluminum alloy

In view of the low melting point and low boiling point of aluminum alloy, the thermal conductivity is good, so high cutting speed is required. However, the surface of the aluminum alloy will produce an oxide film at high temperature, which reduces the conductivity. There are two solutions for this. First, the pulse discharge current can be increased and the discharge time can be shortened. After wire cutting, the surface is smooth and rough.

2.Carbon steel for wire cut EDM

Carbon steel has a high melting point, so the amount of electrical corrosion during processing is small, and the speed is correspondingly low. In order to improve work efficiency, while increasing the discharge current and time, the pulse interval should also be appropriately increased. In actual processing, it should be Heat treatment is performed in advance so as not to affect the subsequent process. The cutting speed of unquenched 45 steel is very slow. On the contrary, the 45 steel after quenching is not very sticky, and the specific surface is relatively smooth, so the processing is more stable.

3. stainless steel cutting

The melting point of common compensator is generally between 1400~1500℃, and the thermal conductivity is also between 20~29. Because there is an emulsion during operation, a lot of black sticky substances will be attached, causing problems. Therefore, it is necessary to increase the pulse interval and flushing pressure. and flow rate.

4. Copper material cutting

Pure copper has high density, high viscosity, high thermal conductivity and melting point, resulting in a small amount of electrical corrosion. In order to improve the efficiency, the pulse interval should be appropriately reduced to eliminate the influence of thermal conductivity. However, brass is soft and chips float on the work surface

The conditions required for wire cutting of various materials are different, and it is mainly based on their material properties that better adjustment can improve the efficiency of wire cutting. The advantages of wire cut EDM cannot be ignored. For example, the gap between the convex and concave molds can be adjusted arbitrarily, saving electrodes design and time and manufacturing costs. The influence of electrical parameters on processing is affected by pulse discharge current, pulse discharge time, pulse interval, and pulse no-load voltage. Therefore, setting reasonable electrical parameters can also effectively improve processing efficiency.

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