Efficient
The requirements of modern machining provide the best machining mode for CNC EDM technology, which requires a substantial increase in roughing and finishing efficiency under the premise of ensuring machining accuracy. For example, in the fields of mobile phone casings, home appliances, electrical appliances, electronic instruments, etc., it is required to greatly shorten the discharge time of large-area (for example, 100×100 mm) workpieces, and at the same time reduce the roughness. It has been improved from the original Ra of 0.8 μm to Ra 0.25 μm, so that it is no longer necessary to perform manual polishing after discharge. This not only shortens the processing time and saves the trouble of post-processing, but also improves the quality of the mold, which can be achieved by using powder processing equipment. In addition, the auxiliary time (such as programming time, electrode and workpiece positioning time, etc.) is reduced. This requires an automatic programming function of the machine tool and a fixture and device for positioning the electrode and the workpiece. The use of graphite electrode materials in the roughing of large workpieces is also a good way to improve the processing efficiency. The best processing mode is the capital for enterprises to expand market space and enhance market competitiveness. The new products and technologies developed by them are becoming more and more popular.
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CNC EDM technology has also made great progress in miniaturization, safety and environmental protection.
1.2 The rapid development of CNC EDM technology has enabled machine tool manufacturers to improve their production technology. At present, CNC EDM machine has achieved significant results in the improvement of servo system and pulse power supply, greatly improving the quality and processing efficiency of CNC EDM.
Improvement of machine tool servo system
Precision machine tool servo systems are of great significance for EDM. The linear motor-driven CNC EDM equipment developed recently has significantly improved the processing performance. The linear motor is arranged on the drive shaft to achieve high response and smooth drive, which improves the stability of the mechanical system and avoids the action lag. The spindle of the CNC EDM machine adopts the high-speed lifting technology of the linear motor, which further improves the discharge performance of the machining chips, thereby improving the processing performance and realizing the no-flush processing. The linear motor-driven machine tool can control the machining depth to a minimum and achieve high-precision machining due to the good tracking performance of the highly responsive servo. The application of linear servo system has obvious technical advantages in the processing of deep and narrow micro-cavity. Linear motor technology will become the leading force in the 21st century EDM machine servo system.
Improvement of machine tool pulse power supply
Pulsed power supplies play an extremely important role in increasing machining speed, reducing electrode losses, ensuring machining accuracy and improving surface quality. Various pulse power supplies have made great contributions to the processing of high speed and high grade. The ultra-precision power supply is used in EDM precision and micro-machining. This type of power supply has a small single pulse energy (nanosecond pulse width), and the processing speed is slow, the electrode loss is large and the low pulse is solved by other measures on the circuit. Wide process contradiction. The intelligent adaptive power supply adopts the microcomputer digital control technology, selects the processing standard, and adaptively adjusts the relevant pulse parameters in the processing to achieve the optimal stable discharge state with high productivity. In addition, the new pulse power supply also has an energy-saving pulse power supply, an equal energy pulse power supply, and various dedicated auxiliary power supplies. With the deepening of research and development work, the performance of pulsed power supplies has also made greater progress.
2 CNC EDM process
The development of CNC EDM technology makes the operation of the process faster. The operation process of the numerical control electric spark machine using ATC (automatic electrode exchange device) is as follows: after the machine is turned on, the machine returns to the machine origin; then the workpiece is clamped, and the reference ball is fixed at any position within the X and Y strokes of the table; The electrode to be processed is loaded into the ATC electrode library, and the reference electrode is inserted into the spindle chuck; the positioning of the workpiece zero point by the center of the reference electrode is completed by manual control; then the centering of the reference electrode to the reference ball is completed, and the center of the reference electrode is shifted. Volume memory.
Use the automatic programming software to create the program, first input the used electrode number, processing depth, and perform the search processing conditions; then make a combination of the program and the machining program for measuring the offset of the machining electrode center, and save the created program; Processing can begin. The electrode is automatically loaded during the machining process, and the center offset of the machining electrode is automatically measured, the automatic positioning, the oil processing, and the monitoring processing. The important operation steps of the whole process are in the programming process. The programming ideas must be clear when programming, and the input values ​​must be accurate to ensure the correct execution of the automatic machining process. The numerical control EDM operation process without the ATC electrode library is the same as the above, except that the steps of changing the electrode and measuring the center offset in the process need to be completed manually. It can be seen that ATC is an important tool for CNC EDM automation, and its application breaks the cumbersome operation mode of traditional machining.
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