The requirements that the wire electrode wire for slow-moving wire cutting should meet when selecting

Slow-moving wire cutting electrode wire requires relatively high requirements, and the following requirements should be met when selecting: 1. Conductivity. 700A processing current must flow through it during processing, and the heat generation cannot be very large, which is right. The resistance of the electrode wire has certain requirements, and the resistivity of red copper is very low, so it can better meet this requirement. In addition, the resistivity of brass is also low, but it is significantly higher than that of copper. 2. Mechanical properties The tensile strength is the mechanical performance of the electrode wire, which reflects the ability of the electrode wire to resist deformation. This property can be calculated by the load concentration per unit area, and the corresponding unit is Pa. According to material knowledge, the tensile strength of 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. 3. Hardness characteristics Commonly used electrode wires are generally considered to be hard wires and soft wires. The soft wire will bend instead of a straight line when it is pulled from the spool, so it is not suitable for automatic threading mechanism, but because it will increase the tension of the electrode wire during processing, there is no difference between the soft wire and the hard wire in the processing; The hard wire can better meet the requirements of the automatic threading machine. In addition, it can also avoid the jitter related to the current impact during cutting, which is beneficial to improve the processing accuracy. 4. 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, so as to meet the processing accuracy requirements of the corresponding inclined surface, and the movement in the guide wire nozzle is more stable. But after starting to cut, the jitter of this electrode wire will be larger than that of a hard wire. 5. Geometrical characteristics The original wire-cut electrode wire did not have too high requirements for the shape deviation, but nowadays, the high-efficiency and high-precision WEDM machine tool puts forward extremely high requirements for several properties of the electrode wire. 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. 6. Flushing performance Flushing performance mainly reflects the difficulty of flushing of its electro-erosion products, which has a great influence on the cutting speed, and the zinc content is closely related to this performance, but 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 will slow down the cutting process, reduce the speed, and also affect the accuracy. The material will melt when the temperature reaches the melting point, and some may be vaporized. For this reason, the electrode wire needs to have a high melting point. Previous post: The thinning rate of automotive hot stamping parts is concentrated on the influence of process parameters