Electric spark micro hole machine tool
Electric spark micro hole machine tool, also called spark drill, is a kind of machine tool that cuts a hole on a workpiece with an electrode. It is featured in high processing accuracy, especially for burrs and clean depths; excellent surface quality; easy and fast cutting starts; strong adaptability of hole depths, hole diameters and workpiece materials; low cost of single piece; and convenient programming and operation.
The working principle of the electric spark micro hole machine tool is to ignite an electric arc by the spark gap of the alternating current high voltage electricity, to heat and vaporize the metal material of the high temperature point through the heat concentration effect along the arc to excavate the small micron holes.
The electric spark micro hole machine is composed of cutting power supply, pressurization station, cooling system, deionized water tank and computer control system. On the basis of the normal electric spark micro hole machine, advanced functions such as small hole piercing and depth control, which correspond to ultra-precision machining, have been added.
The power supply of electric spark micro hole machines generally use DC high voltage power supply. The main function is to provide repetitive spark supply with low energy loss, that is, more intensive energy point, which is beneficial to material cutting and environmental protection. The current is at least 7A for a single hole and 10A for multiple holes.
The pressurization device of electric spark micro hole machine is as a necessary tool for hole processing. The main function is to ensure that the distance between the electrode and the workpiece is constant, so as to ensure the processing accuracy. The pressure of the pressure device can reach up to 74MPa.
Cooling is also an indispensable part of electric spark micro hole machining. During the electric spark machining process, due to the high temperature generated, if it is not cooled, it will cause huge heat to the electrode, which will lead to the reduction of the life of the electrode and the unevenness of the machining accuracy. Therefore, in order to meet the working requirements of electric spark machining, water cooling is usually adopted to cool the electrode and the workpiece during machining.
The electric spark micro hole machine needs to be cooled during the machining process. Generally, an electric power supply system and an oil-water separator are adopted. A heat sink is also set on the heat sink for dissipating the heat generated by the machine tool, which enables the machine tool to continuously perform long-term operation.
The computer control system of electric spark micro hole machine is mainly used to control the punching system. It mainly includes the main shaft speed, the current amplitude, the spark gap size, the cutting depth and the pressure of the pressurization device. Through programming, these parameters can be automatically adjusted and the effect of processing can be monitored, so as to ensure the stability of precision and accuracy of electric spark processing.
In short, electric spark micro hole machine tool can play a role in improving the quality and efficiency of small hole processing. It is widely used in various industries and has been widely used in precision hole machining, engraving and corrosion.
