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Slow wire wire cutting is a kind of electric discharge wire cutting. It uses continuously moving fine metal wires as electrodes to perform pulse spark discharge ablation and cutting forming on the workpiece. It is mainly used to process various high-precision parts. So what requirements should a stamping company meet when selecting electrode wires for slow-moving wire cutting? 1. Conductivity. 700A of processing current must flow through it during processing, and the heat can not be very large, which has certain requirements on the resistance of the electrode wire, and the resistivity of copper is very low, so it can better meet this Aspect requirements. In addition, the resistivity of brass is also low, but it is significantly higher than that of copper. 2. Geometric characteristics. The previous wire cutting electrode wires did not have too high requirements for the shape deviation. Nowadays, high-efficiency and high-precision machine tools have extremely high requirements for several properties of the electrode wires. The diameter tolerance required for the electrode wire is generally plus or minus 1 micron, and the gem wire drawing die needs to be used for subsequent processing before the finished product, so that the corresponding smooth performance requirements can be better met. 3. Flushing performance Flushing performance mainly reflects the difficulty of washing the electro-erosion products, which has a great influence on the cutting speed. The zinc content is closely related to this performance, and its influence mechanism is more complicated. The melting point of the electrode wire will affect its service life. During the processing, the electrode wire will jitter, which slows down the cutting process and reduces the speed, and at the same time affects the accuracy. The melting point of the electrode wire needs to be high, because the material will melt when the temperature reaches the melting point, and some may vaporize. 4. Hardness characteristics Commonly used electrode wires are generally divided into hard wires and soft wires. The soft wire will bend instead of a straight line when it is pulled from the wire shaft, so it is not suitable for automatic threading mechanism, but because the wire will increase the tension during processing, there is no difference between soft wire and hard wire in processing; The hard wire can better meet the requirements of the automatic threading machine. In addition, it can avoid the jitter related to the current impact during cutting, which is beneficial to improve the processing accuracy. 5. Mechanical properties The tensile strength is the mechanical performance of the electrode wire and the ability of the electrode wire to resist deformation. It can be calculated by the load concentration per unit area, and the corresponding unit is Pa. According to material knowledge, the tensile strength of red copper is only 245 MPa, which is much lower than that of molybdenum. Relevant studies have found that the content of zinc has a great influence on this performance, which may be related to alloying. 6. Elongation In the process of electrical machining, many factors will affect the performance of the electrode wire, and the tension and temperature difference will affect the length of the electrode wire. The elongation can reflect its performance in this respect. Soft wire has better flexibility, while hard wire is generally less than 2%, which is more than one-tenth of the former. When processing taper workpieces, the electrode wire needs to have high toughness to meet the machining accuracy requirements of the corresponding inclined surface, and the movement in the guide wire is more stable. But after starting to cut, the jitter of this electrode wire will be greater than that of a hard wire. [Related recommendation] Learn more: 5 ways to improve the surface roughness of stamping parts