The preparation and application of aluminum alloy forging cutting fluid are basically the same as ordinary cutting fluid, but the choice of dilution water is more and more strict. Because many ions in water will corrode aluminum, if the content of these ions is too high, the antirust performance of cutting fluid will be reduced, especially in the process of antirust, such as chloride ion, sulfate ion and heavy metal ion. In addition, some ions, such as calcium and magnesium ions, will react with the aluminum antirust agent in the cutting fluid and reduce the antirust property and stability of the cutting fluid. Therefore, try to choose diluted water with less hardness or diluted water softened by ion exchange to ensure the application effect and service life of cutting fluid.

Maintenance of cutting fluid for aluminum alloy processing In addition to routine maintenance of common cutting fluid, Jiahang aluminum alloy forging reminds you to pay attention to the following points:

1. Filtering

Because aluminum alloy is easy to react to produce aluminum soap under alkaline conditions, which destroys the stability of cutting fluid, the cut aluminium scrap should be filtered in immediately to prevent aluminium scrap from reacting with cutting fluid again, which will affect the application effect and service life of cutting fluid. Aluminium scrap ground in the grinding process is small and light, so it is difficult to precipitate. If the filtration is not stopped or insufficient, aluminium scrap will scratch the surface of the workpiece with the cutting fluid circulation system, which will affect the gloss of the machined surface.

2. pH value

Because aluminum is very sensitive to the pH value of cutting fluid, it is necessary to stop testing the pH value of aluminum alloy cutting fluid regularly, and stop adjusting it in time if any abnormality is found. The pH is controlled at 8 ~ 9, so as to prevent the workpiece from being corroded by too high pH value or the bacteria from multiplying in large quantities due to too low pH value, which will affect the stability and application performance of cutting fluid.

3, regularly add new liquid.

It not only ensures the good smoothness of the cutting fluid, but also ensures the good antirust performance, sterilization and anticorrosion performance of the cutting fluid, so as to prolong the service life of the cutting fluid.

Heating technology of aluminum alloy forging

Aluminum alloy can be heated before forging by various heating equipment, such as resistance furnace, gas furnace, oil furnace, induction heating installation, fluid particle furnace and so on. Resistance furnace is commonly used for heating in China. In this case, it is best to install forced furnace gas circulation in the furnace to promote the average temperature of the furnace. When using gas-fired or oil-fired furnaces, it is necessary to use low-sulfur fuel, and the flame in the furnace is not allowed to directly radiate the appearance of the blank. Foreign countries think that muffle furnace is the best for aluminum alloy forging heating, and gas semi-enclosed furnace has been widely used. When the forging process of aluminum alloy is highly automated, the commonly used heating methods are induction heating, resistance heating and fluid particle heating.

The forging temperature range of aluminum alloy is narrow, and it is easy to overheat and burn, so it is necessary to measure and control the temperature accurately, and the furnace temperature deviation is preferably within 5℃.

Aluminum alloy has good thermal conductivity, so the blank with any thickness can be directly heated in a high-temperature furnace without preheating, but the heating time is longer than that of ordinary carbon steel. This is because the internal strengthening phase must be fully dissolved when aluminum alloy is heated, so as to make the alloy structure average and plastic progress. The heating time of aluminum alloy blank is calculated according to the diameter or thickness of 1.5 ~ 2 min per millimeter. The dissolution process of strengthening phase is related to the size, shape, dispersion characteristics and properties of strengthening phase. The coarser the structure, the slower the dissolution, so the upper limit of heating time should be taken for ingots, large forgings and thick bars (φ100mm or more). The heating time of billet with high content of alloying elements is longer, for example, LC4 should be longer than LD2 alloy. Under normal circumstances, the heating time of aluminum alloy is 1 ~ 2 hours. If it is necessary to extend it, the heating time can exceed 4 ~ 6 hours. If it is longer, the metal should be taken out of the furnace to prevent overheating and hydrogen absorption.

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