一．Principle of wire cutting
Free positive ions and electrons accumulate in the field and quickly form an ionized conductive path. At this stage, a current is formed between the two plates. It causes numerous collisions between particles, forms a plasma zone, and quickly rises to a high temperature of 8000 to 12000 degrees. The material to be processed is instantly melted on the surface of the two conductors, and at the same time, due to vaporization of the electrodes and the dielectric liquid, a Bubbles, and its pressure rules rise until it is very high. Then the current is interrupted, the temperature suddenly drops, causing the bubble to blast inward, and the generated power throws the dissolved material out of the crater, and then the corroded material recondenses into a small sphere in the dielectric liquid and is discharged by the working fluid. Then through the monitoring and control of the NC control system, the servo is executed to make this discharge phenomenon uniform. The cutting is then repeated until the processing is complete.
二．Wire cutting features
Wire cutting is a cutting method that integrates machine tool electrical appliances, high-frequency power supply, servo control and graphic programming. It achieves high efficiency, high precision, high smoothness, simple processing control, and greatly improves the processing level of fast wire cutting machine tools. The reversing of the cutting machine tool adopts the flexible reversing of the frequency converter, and the speed of the conveying drum can be adjusted arbitrarily, thereby improving the workpiece finish. High efficiency (cutting efficiency up to 7000 to 8000 square millimeters per hour) is twice the efficiency of ordinary cutting method, energy saving (machine tool hourly energy consumption 0.85 kWh) 50% energy saving compared to ordinary cutting, environmental protection (machine tool environmental protection water hood to prevent working fluid Splashing, using high pressure filter tank working fluid can be replaced once every 30 working days, greatly improving working time and reducing the number of blowdown. The electrical parts of the cutting machine are all installed in the control cabinet for waterproof treatment, and all the oil supply is integrated with the manual oil pump. .三．Matters needing attention during wire cutting processing;
⑴The cutting rate (selected by the control panel) is selected: after clearing the working voltage, the force, the duty ratio, and the spacing, the method of measuring the short-circuit capacity by using the long-term fault is first used, and then the laser cutting is started, and the control panel is adjusted. DC inverter gear and tracking knob, etc., so that the production and processing current exceeds 75~70% of the short-circuit capacity.
⑵During the cutting process, the various states should be switched as much as possible when changing the spool or turning off the high frequency. The state should not be adjusted within a single large range to avoid disconnection.
⑶ When the new molybdenum wire is replaced, the surface of the new molybdenum wire is covered with a layer of black oxide. During the machining process, the cutting speed is fast and the surface of the workpiece is thick black. At this time, the power of the power source is too large, and the wires are easily broken. The machining current is selected to be one-third to two-thirds of the normal cutting current. After cutting for ten minutes, the electrode line is basically whitened and then adjusted to a normal value.
This article briefly introduces the features and advantages of wire cutting. For more information, please find the relevant information.
