A special precision machining technology as EDM, has developed rapidly in recent years. Especially the WEDM, hasbecome an indispensable tool in mould manufacturing and metal processing industry. Development of wir.Development of wire cutting technology, cannot do without the synchronous development of wire electrodetechnology. Because the wire cutting machine cutting efficiency and performance quality and wire electrode cuttingclosely related, and the electrode wire technology breakthroughs often lead to machine design WEDM innovation.The invention of galvanized wire electrode from 1979 to today, the market appeared a variety of wire electrode isbetter than ordinary brass wire performance, the correct selection of wire electrode has become the key properties of the line cutting machine maximize and create more profits for the user.

Now, in the developed countries in Europe and the United States and Japan, high performance wire is galvanizedwire electrode based is gradually taking the place of discharge performance limits of brass. At the same time, in addition to have galvanized wire electrode as the standard configuration of the wire cutting machine manufacturerAgie and Charmilles, now Mitsubishi and Sodick is the latest models of increase mode and processing parameters using galvanized wire, significantly improve the cutting speed of these devices compared with brass 30%~50%.

But in China, a few years ago because of the European imports of galvanized wire electrode higher prices, not only Japan, Taiwan and domestic wire walking machine almost all users with brass wire, some have been usinggalvanized wire electrode Agie and Charmilles users, also use the cheap brass wire, resulted in a considerable number of users thought erroneous zone yellow wire electrode wire is in the industry. There are many domesticusers cutting machine in the introduction of the latest high performance line at the same time, ignore the importance of wire electrode, thinking that it is just a common consumables. No matter what type or processing requirements,brass wire with its low price seems to be the only choice. From 2002 onwards, the price from South Korea bettergalvanizing wire electrode used for many users in Guangdong area, made the obvious benefits to more and more, in 2003 the industry users begin to focus on the application of galvanized wire electrode, different processing, usingthe concept of different electrode wires to smart line cutting users accept. In fact now WEDM has more than the pastchanges, from the processing of materials, cutting speed, precision of outline, surface quality to the factoryoperation mode etc.. For these interacting variables, only selective electrode wire to appropriate the factory forprocessing efficiency, processing cost and processing quality of the whole optimization.

Performance, wire electrode

The electrode wire of high performance must be organic combination of various useful features, so the wire electrode has the characteristics which useful?

1, electrical characteristics

Power put forward strict requirements on the wire electrode cutting modern line. It must be able to withstand the peak more than 700 amperes or average cutting current greater than 45 amperes, and energy transmission must be very effective, can provide to meet the high surface finish (above 0.2Ra) high frequency pulse current required. It depends on the wire electrode resistance or conductance. Copper is one of the highest conductivity, it was used as a measure of other material base. Copper conductivity labeled 100%IACS (International Annealed CopperStandard), and brass electrical conductivity of 20%.

2, mechanical properties

Tensile strength:

The tensile strength is a measure of the ability of fracture resistance of material in radial load. It . It is under the unitarea weight scales, such as the imperial PSI (pounds per square inch) or metric N/mm2 (Newton / mm2). Coppermaterials belonging to the lowest tensile strength (245N/mm2), and molybdenum is the highest (1930N/mm2).Tensile strength depends on the wire electrode in the choice of materials and heat treatment and tensile process.The electrode wire is sometimes divided into soft wire and hard wire, for the equipment and the application of different, each has its own advantages.

Memory effect:

This and the electrode wire is directly related to the soft or hard. Without a recovery in line memory soft wire drawingline shaft, therefore cannot be used for automatic wire, but the cutting is not affected, because the processingelectrode wire with tension. Suitable for soft wire, wire Tsui not inclined equipment to cut more than 7 degrees. Hardwire is the best choice for automatic wire threading machine, at the same time, because of high tensile strength,resistance to current and flushing force caused by wire cutting jitter ability.

Elongation:

The elongation is the percentage of wire electrode cutting length change caused by tension and heat processing.Extension of soft wire rate can reach 20%, while the hard wire is less than 2%. Soft wire in the obliquity, the high rate of extension wire electrode can guarantee the geometric accuracy of the inclined plane, and the electrode wire softslide in the guide wire tip in the vibration generated by the smaller. But the electrode wire into the cutting zone shakedegree of soft wire than hard wire, so have to compromise.

3, geometric characteristics

Early technology development online cutting (1969 to mid seventy's), the electrode wire almost didn't do anyresearch, use the ready-made motor and cable of the copper wire. Today, high efficiency and high precision wire cutting machine for wire electrode geometry error is very small. At the end of the process. The electrode wiremanufacturing is to use Multi Gemstone wire drawing die to obtain a smooth, round excellent, wire diametertolerances for +/-0.001mm product. On the other hand, there are some wire electrode is specially designed with arelatively rough surface, can improve the cutting speed.

4, the thermal physical properties

Electric