How to maintain the wire-cut EDM machine?

The wire-cut WEDM machine is a high-precision machine tool. Maintenance of the machine tool is very important because the high precision and high quality of the machined workpiece are directly established on the basis of the high precision of the machine tool. Therefore, the machine tool must be inspected before each machining operation. The working conditions can provide the conditions for obtaining high quality machined parts.

The links to be noted and the measures to be taken are as follows:

(1)Before processing, the wire of the wire-cutting machine tool must be inspected. The tension of the electrode wire also has a great influence on the surface quality of the machined workpiece. The workpiece with high surface quality requirements should be increased as much as possible under the premise of continuous wire. Silk tension.

(2) The medium wire cutting machine generally uses water-based working fluid. The spark discharge must be carried out in a liquid medium with certain insulating properties. The insulating properties of the working fluid can compress the discharge channel after breakdown, thus confining the spark discharge within a small channel radius, forming instantaneous and local high temperatures to melt gas. After the metal is discharged, the discharge gap is quickly restored to the insulating state. If the insulation performance is too low, the working fluid becomes an electrical conductor and spark discharge cannot be formed. If the insulating performance is too high, the discharge gap is small, the chip removal is difficult, and the cutting speed is reduced. Before processing, different types of water bases should be selected according to different process conditions. In addition, the conditions related to the coolant must be checked to check the fluid volume and the degree of contamination, so as to ensure that the insulating performance, washing performance, and cooling performance of the hydraulic fluid are satisfactory.

(3) The wear of the conductive block must be checked. In the wire-cutting wire cutting machine in general, after processing for 50 to 80 hours, it is necessary to consider changing the cutting position of the conductive block or replacing the conductive block. When there is dirt, it needs to be cleaned with the washing liquid. It must be noted that when the position of the conductive block is changed or the conductive block is replaced, the perpendicularity of the electrode wire must be re-calibrated to ensure the precision and surface quality of the machined workpiece.

(4) Check the rotation of the guide wheel. If the rotation is not good, it should be replaced. The damage of the upper and lower nozzles and the degree of contamination must be carefully checked. Dirty matters should be removed with the cleaning fluid. When there is damage, it must be replaced in time. The condition of the inner wire of the wire storage drum should also be inspected frequently. If the wire loss is too large, it will affect the machining accuracy and surface quality, and it needs to be replaced in time. In addition, the poor condition of the conductive block, the guide roller, and the upper and lower nozzles also causes the vibration of the wire electrode. Even if the machined surface can perform good discharge at this time, due to the vibration of the wire electrode, the processed surface is likely to produce peaks or stripes. Eventually cause the surface roughness of the workpiece to deteriorate.

(5) Maintain a stable power supply voltage. Unstable power supply voltage will cause the neutral wire electrode and the workpiece to be unstable at both ends, which will cause unstable breakdown discharge process and affect the surface quality of the workpiece.