Spark machine processing has always been an important part of mold manufacturing technology, playing a very important role in the manufacturing industry. This article mainly discusses the stability judgment method and advantages of CNC electric discharge machines.
Observe the dial gauge on the spindle cover of the CNC spark machine and distinguish it based on the jitter of the dial gauge. During discharge, observing the dial gauge on the spark machine spindle cover, the pointer jitter within 0.02mm can be judged as normal discharge. If it exceeds this value, it can be judged as unstable discharge, and it is recommended to adjust discharge parameters or improve flushing and other methods to solve it.
Observe the "processing depth" display area and "Z-axis position" display area on the CNC electric discharge machine control panel. The difference between the values of the "processing depth" and the "Z-axis position" display area is less than 0.02mm, which can be judged as normal discharge. If it is greater than 0.02mm, it can be judged as unstable discharge, and it is recommended to adjust discharge parameters or improve flushing and other methods to solve it.
Observe the control panel of the CNC spark machine: pause, discharge, and carbon accumulation indicator lights. If all these three indicator lights are not on, it means that the discharge processing is normal. Pause: the indicator light is flashing, indicating that the discharge is not stable. It may flash due to burrs on the electrode or workpiece at the beginning of processing and can be ignored.
CNC electric discharge machine designs two side trimming procedures. Rectangles with sharp edges use flat-bottomed rectangular trimming plans, while circles or multi-curved elliptical shapes use flat-bottomed circular trimming plans. During the side trimming process, the electrode moves towards the workpiece at an angle, while the tool electrode is controlled automatically by the CNC system, i.e., three-axis linkage, moving from inside to outside, from top to bottom, which is less prone to carbon accumulation, and has easy slag discharge and ventilation. This motion mode does not create arc rubbing, and has high production efficiency.
CNC electric discharge machine uses lateral processing along the X-axis for mold opening and closing, which has high mold accuracy and significantly higher production efficiency than downward processing along the Z-axis.
CNC electric discharge machine can use a single electrode for rough and precision machining, saving the manufacturing time and cost of double electrodes, and eliminating the trouble caused by the correction of precision machining electrodes, shortening the mold manufacturing time.
CNC electric discharge machine adds special controls to the control circuit. When arc rubbing or false short circuits occur, the pulse power supply is immediately cut off, energy supply to the cavity stops, and the electrode temperature will not continue to rise, reducing the risk of fire.
CNC electric discharge machine uses a high-voltage breakdown before applying a complete low-voltage pulse, with equal pulse width. Practical application proves that this pulse mode further reduces the wear and tear of tool electrodes and uniformly rough and process the surface. The loss on the end face of the tool electrode is minimal.
The self-adaptability function refers to the automatic lifting of the knife when the erosion debris in the cavity is greater than the production, the discharge is stable, and the system does not stop lifting the knife. When the erosion debris produced is greater than that discharged, the balance is broken. At this time, the spark machine automatically lifts the knife to utilize the suction effect of the working fluid to remove the excess erosion debris. When the production volume is greater than that discharged, the automatic lifting of the knife stops, improving the processing efficiency.