xiehe model

Selection, use and maintenance of cutting fluid for aluminum alloy cnc machining

Compared with most steel and cast iron materials, aluminum has many remarkable characteristics in physical properties: the strength and hardness are much higher than pure aluminum, but lower than steel, the cutting force is smaller, and the thermal conductivity is good.

Due to its soft texture, strong plasticity, and easy sticking to the cutting tool, BUE will be formed on the cutting tool, and welding may occur on the cutting edge during high-speed cutting, which will cause the cutting tool to lose its cutting ability and affect the machining accuracy and surface roughness. In addition, aluminum has a large coefficient of thermal expansion, and cutting heat can easily cause thermal deformation of the workpiece and reduce machining accuracy.

To sum up, the choice of cutting fluid for CNC machining of aluminum alloys is very important, and good lubrication, cooling, filtration and anti-rust performance must be ensured. Therefore, the cutting fluid for CNC machining of aluminum materials is different from ordinary cutting fluid, so choose the appropriate cutting fluid very important.

According to the processing conditions and precision requirements of aluminum alloy cnc, different cutting fluids should be selected. Because high-speed cnc machining will generate a lot of heat, such as high-speed cutting and drilling, if the heat generated cannot take away the cutting fluid in time, there will be a sticking phenomenon, and even BUE, which seriously affects the processing roughness of the workpiece and the tool life. It will also cause thermal deformation of the workpiece, seriously affecting the accuracy of the workpiece. Therefore, the choice of cutting fluid needs to consider its own lubricity and cooling performance.

For grinding, the grinding debris is very small, and a lot of heat will be generated during the grinding process. It is necessary to consider not only the lubrication and cooling performance of the cutting fluid, but also the filtration of the cutting fluid. If the viscosity of the selected cutting fluid is too high, the chips cannot be deposited or filtered out, and it will scratch the surface of the workpiece processing area with the circulation of the coolant, thus affecting the processing of the surface finish. Therefore, choose ultra-fine grinding for grinding or low-viscosity grinding oil or semi-synthetic cutting fluid for grinding.

When selecting a cutting fluid, in addition to the lubrication and cooling properties of the cutting fluid, the corrosion resistance, cost and ease of maintenance of the cutting fluid should also be considered. For cutting oil, it is easy to choose anti-friction additives for base oils with relatively low viscosity, which can not only achieve lubricating friction, but also have good cooling and easy filterability. However, cutting oil has the problems of low flash point, large smoke during high-speed cutting, high risk factor, fast volatilization, and high user cost. Therefore, water-soluble cutting fluid should be used as much as possible when conditions permit.

For water-based processing fluids, it is more important to consider rust prevention. Now commonly used water-based antirust agents include aluminum silicate and phosphate esters. For long-term processing of workpieces stored in processing, phosphate ester antirust agents are easy to use. As silicon-based materials and aluminum long-term contact corrosion occurs Black "silicon spots" appear. The ph value of the cutting fluid should be kept above 8 to 10. If the rust is not good, the aluminum material will be easily corroded under alkaline conditions. Therefore, water-soluble cutting fluid must have good aluminum corrosion resistance.

Use and maintenance of aluminum alloy cnc machining cutting fluid

The formula and use of aluminum alloy cnc machining cutting fluid are basically the same as ordinary cutting fluid, but the selection of dilution water is more strict. Because many aluminum ions in water can cause corrosion, if the content of these ions is too high, it will reduce the anti-rust performance of the cutting fluid, especially in the process of rusting, such as chloride ions, sulfate ions and heavy metal ions. In addition, some ions will also react with the rust inhibitor of the aluminum cutting fluid, reducing the rust resistance and stability of the cutting fluid, such as the occurrence of calcium and magnesium ions. Therefore, try to choose dilution water with lower hardness, or soften ion exchange water after dilution to ensure the use effect and life of the cutting fluid.

In addition to the daily maintenance of cutting fluid, the maintenance of aluminum alloy cnc machining cutting fluid also needs to pay attention to the following points:

1. Filtration

Due to the stability of the reaction of aluminum alloy and aluminum soap, the cutting fluid is easily damaged under alkaline conditions, and the aluminum chips, aluminum chips and cutting fluid should be filtered out immediately to avoid another reaction and affect the use effect and life of the cutting fluid. The aluminum scraps produced during the grinding process are small and light, and it is difficult to continue to settle. If not filtered or not filtered sufficiently, the aluminum scrap processing area will be taken away with the cutting fluid circulation system, and scratches on the surface will affect the gloss of the processed surface.

2. pH value

Since the aluminum cutting fluid is very sensitive to the ph value, the ph value of the aluminum cutting fluid should be checked regularly, and any abnormality should be adjusted in time. Use ph to be controlled at 8-9 ph to avoid excessive corrosion of the workpiece or too low ph to cause bacteria to multiply and affect the stability and performance of the cutting fluid.

3. Regularly add new plans

It not only ensures the good lubricity of the cutting fluid, but also ensures the good anti-rust and anti-corrosion properties of the cutting fluid, prolonging the service life of the cutting fluid.

In conclusion

It is extremely important to choose the cutting fluid for aluminum alloy cnc machining. It must not only ensure good lubricity and corrosion resistance of the cutting fluid, but also have good stability, filterability and easy maintenance. Only in this way can the requirements of processed products be met and maximized. Minimize the cost of cutting use of bodily fluids.