Yang Dayong (right), director of Beijing Electric Processing Research Institute and metal processing online reporter
When we walked into the door of CIPM2011's 12th China International Machine Tool Show, high-speed milling (HSM) and a few electroforming processes (sinking electro-discharge machining) Seen for SEDM), it seems that it has been argued that the problem of 10 years has already come to a conclusion. EDM machine tools are only used as an indispensable process to solve the sharp and narrow grooves of the deep and narrow grooves and cavities, that is, the mold. The supporting role in the manufacturing industry only, but after a deep understanding of the progress stage, it is found that the actual competition is very different, sweeping away the trend of the past, EDM processing technology has completed the strategic transfer.
Director of Quality Management Department of Beijing Electric Processing Research Institute Fu Jinjuan
1. EDM machine tools have great advantages in the processing of small and medium-sized molds, especially small high-grade molds.
The functional integration of the electromechanical products and the corresponding miniaturization make the mold contain a large number of complex cavities in 1mm3, and the high hardness of the material in order to improve the life of the mold. At this time, the high efficiency of the machining center is exerted. Not coming out. On the contrary, due to the small amount of material to be removed, the relatively low material removal efficiency and certain loss of the EDM process are not a major problem. The smaller and more complex the cavity, the more obvious its advantages. Especially in the current situation, the mold factory strives to survive and tap the potential, such as mobile phones (many exhibitors have exhibited samples processed directly with SEDM) and digital camera molds are polished for about 1/4 of the mold making cycle, aiming for no polishing and less polishing. The important way out is that the cutters and knife marks left by the milling cutters are a big problem of polishing, and even in small chambers, they cannot be polished at all. All of these EDM processes are steadily achieved at current performance levels without the need for large expenditures. Of course, this is not to say that the machining center can't do small and complex cavities, but it is not economical in terms of machining time and tool costs. In the medium and large molds, in addition to the work of narrow and deep grooves and clear angles, such as the sound windows of TVs and audio equipment, cars and entrance grilles, and the cavity with large drop, such as the die-casting model core of the automobile engine box, The long milling cutter is processed. At this time, the surface quality cannot be guaranteed due to insufficient tool rigidity. In this case, only EDM can be used. It can be said that EDM has become the protagonist in small-cavity processing. This part of the market is now developing very fast enough to make the EDM processing stand firm, and at least the best supporting angle in the medium and large cavity machining. In fact, the EDM and high-speed milling machining centers are not the two sides of the game, but the advantages complement each other and enter a win-win situation. For this reason, EDM has made considerable progress in technology in recent years, and on this basis, a series of new models have been introduced. For example, the Fo350? machine tool of GF AgieCharmilles of Switzerland is directly advertised as a small cavity for making 1mm3 volume, which is equivalent to the EA8PVM Advance small high-speed high-precision machine tool of Mitsubishi Electric Corporation, guaranteeing accuracy of ±0.003mm, Makino's EDACI machine tool, which can achieve the welding mark on the grinding surface within ±1?m, the A30 precision CNC EDM machine tool of Beijing Electric Processing Research Institute can directly realize the mirror processing of a large area. The impressive sample is a 0.2mm wide, 0.3mm deep micro-groove of the connector mold, which can be stabilized to a bottom angle of 0.01mm or even less than 0.005mm.
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