News

Name of experiment：Application of power amplifier ATA-1220D in precision electrochemical machining

Experimental principle：

Electrochemical machining (ECM) is a special machining method based on electrochemical anodic dissolution of metal in electrolyte. In the electrolytic processing, the workpiece is connected to the positive pole of the power supply, the tool is connected to the negative pole of the power supply, and a certain machining gap is maintained between the tool and the workpiece. The electrolyte flows through the gap, and the workpiece material is dissolved in the electrolyte in the form of ions, so as to achieve material removal processing.

The conventional electrochemical machining using DC power supply has the problems of low machining precision and poor machining quality. The application of high frequency ultra-short pulse width pulse power supply to electrochemical machining greatly improves the accuracy of electrochemical machining. The wide band power amplifier ATA-122D was used in this experiment to build a micro electrochemical machining power system. As shown in Figure 1, the function generator generates high-frequency pulse signals, and the ATA-122D wide band power amplifier amplifies the high-frequency signals to realize micro electrochemical machining.

Figure 1

Result of experiment：

In the experiment, a high-frequency ultra-short pulse width power supply composed of ATA-122D broadband power amplifier was used to conduct an experimental study on electrochemical machining of tiny holes. The experimental results are shown in Figure 2 below.In Figure 2, (a), (b), (c), (d), (e) and (f) are microhole electron microscopic images at pulse frequencies of 0, 1, 10, 50, 100 and 500 kHz respectively. The tool diameter is 100 μm. The processing results show that with the increase of power frequency, the precision of hole shape and the quality of machining are improved remarkably. In addition, we also realized high-precision micro-hole machining at 700 kHz frequency, as shown in Figure 3.

Figure 2: comparison of electrochemical machining of micro holes at different frequencies

Figure 3: high precision micro hole electrochemical machining