The preparation and use of cutting fluid for aluminum alloy processing is basically the same as that of ordinary cutting fluid, but the selection of dilution water is more stringent. Because many ions in the water will have a corrosive effect on aluminum, if the content of these ions is too high, the anti-rust performance of the cutting fluid will be reduced, especially in the anti-rust between processes, such as chloride ions, sulfate ions and heavy metal ions. In addition, some ions will react with the aluminum rust inhibitor in the cutting fluid to reduce the rust resistance and stability of the cutting fluid, such as calcium and magnesium ions. Therefore, try to choose the dilution water with less hardness, or the dilution water softened by ion exchange, to ensure the use effect and service life of the cutting fluid.
In addition to the daily maintenance of ordinary cutting fluid, the maintenance of cutting fluid for aluminum alloy processing also needs to pay attention to the following points. ①Filtering: Because aluminum alloys are prone to react under alkaline conditions to form aluminum soaps, which destroy the stability of the cutting fluid, the cut aluminum scraps should be filtered out immediately to prevent the aluminum scraps from reacting with the cutting fluid and affecting the cutting. The use effect and service life of the liquid. The aluminum scraps ground during the grinding process are small and light, and it is difficult to settle down. If the filtration is not carried out or the filtration is insufficient, the aluminum scraps will be brought to the processing area with the cutting fluid circulation system and scratch the surface of the workpiece. , which affects the gloss of the machined surface. ②pH value: Because aluminum is very sensitive to the pH value of the cutting fluid, the pH value of the aluminum alloy cutting fluid should be checked regularly, and if any abnormality is found, it should be adjusted in time. The pH should be controlled at 8 to 9, so as to avoid the high pH value corroding the workpiece or the low pH value causing the bacteria to multiply and affecting the stability and performance of the cutting fluid. ③Add new fluid regularly: It not only ensures the good lubrication of the cutting fluid, but also ensures the good anti-rust performance, sterilization and anti-corrosion performance of the cutting fluid, so as to prolong the service life of the cutting fluid.
