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众所周知,在电火花机床上对工具电极或被加工零件施加振动,有利于排除电蚀产物,这会提高加工效率。根据被加工表面的形状以及加工面积、深度和规范的不同,加工效率有时可提高2～4倍。人们通常都是使用电磁振动器,其频率为100Hz,在电火花加工的实践中,也使用超声谐振振动器,其频率为18～44kHz。当采用这种振动器时,振动系统的波长应严格地与超声振动波长成倍数。同时,对工具电极的固定方法也提出了苛刻的要求。工具电极损耗后,振动的谐振状态遭到破坏,因而有必要采用一种自动变换谐振频率的装置。
As we all know, in the EDM on the tool electrode or the workpiece to be applied to the vibration, is conducive to eliminate the galvanic corrosion products, which will improve the processing efficiency. Depending on the shape of the surface to be machined and the processing area, depth and specifications, the machining efficiency can sometimes be increased by 2 to 4 times. People usually use electromagnetic vibrators, whose frequency is 100Hz. In the practice of EDM, ultrasonic resonant vibrators are also used, whose frequency is 18 ~ 44kHz. When using such a vibrator, the wavelength of the vibration system should be strictly multiples of the ultrasonic vibration wavelength. At the same time, the method of fixing the tool electrode also poses harsh requirements. After the tool electrode is depleted, the resonant state of the vibration is destroyed, so it is necessary to adopt a device that automatically changes the resonant frequency.