1. The function of working fluid
In wire cutting machines with electric discharge, the working fluid has a significant impact on the machining process indicators. The performance of the working fluid affects processing efficiency, surface roughness, and
Processing accuracy, processing stability, and other aspects have important impacts. At present, there are many types of working fluids in the industry, each with its own characteristics. Overall, working fluids generally have the following functions:
(1) A certain level of insulation performance. Spark discharge must be carried out in a medium with certain insulation properties.
(2) Good washing performance. The better the washing performance, the less corrosive and sticky products accumulate in the cutting seam, the better the chip removal effect, the higher the processing efficiency, and the brighter and cleaner the surface of the processed workpiece. The working fluid with poor washing performance can cause corrosion products to adhere to the cutting seam, affecting the entry of fresh working fluid and resulting in low processing efficiency. After processing, the workpiece adhesion is basically not easy to remove.
(3) Good cooling performance. During the pulse discharge process, the temperature inside the discharge channel is extremely high. In order to prevent the electrode wire of the wire cutting machine from burning out and local annealing of the workpiece surface, sufficient cooling is required. Therefore, the working fluid must have good cooling performance.
(4) Environmentally friendly and harmless to human health. Harmful gases should not be generated during the processing, and adverse reactions such as skin and respiratory tract injuries should not occur to operators.
2. Conductivity of working fluid
The conductivity of working fluid is an important physical quantity for measuring the conductivity of working fluid, which has a significant impact on machining accuracy, machining stability, machining efficiency, and surface quality. The higher the conductivity of the working fluid, the easier it is to break through: an increase in conductivity will also increase the discharge gap, thereby increasing the volume of erosion, which has a significant impact on machining accuracy and efficiency. The working fluid with high conductivity has a strong electrolysis effect, which plays an electrolytic role in the machining surface and is therefore beneficial for reducing surface roughness values. There is relatively little research on the influence of working fluid conductivity on the machining performance of medium wire EDM machines both inside and outside the industry. However, Baoma CNC has conducted research on the influence of conductivity machining indicators.
