The correct use and protection methods of precision die-casting molds: try to reduce the rapid cooling and rapid heating of the mold, try to produce continuously, and prohibit high-speed injection under the condition of cold mold. During the precision die-casting process, the precision die-casting mold has always been in a reciprocating fatigue state of thermal expansion and contraction. The temperature of the mold cavity basically always changes back and forth between 160 degrees and 350 degrees. Tired and damaged.
Precision die-casting mold
When starting production under the condition of cold mold, the temperature of the mold rises from the low temperature, the temperature difference increases, the expansion of the mold is shortened, and the fatigue of the mold increases accordingly, which will accelerate the damage of the mold and shorten the life of the mold. Therefore, in the production of precision die casting, continuous production should be made as much as possible, the rapid cooling and heating of the mold should be reduced as much as possible, and then the life of the mold should be extended.
Reduce the injection speed as much as possible, reduce the specific pressure as much as possible, and reduce the impact of the mold. During the production of precision die casting, the unevenness of the injection speed not only affects the filling speed and the injection gate speed of the precision die casting, but also increases the impact peak when the injection speed is high. Therefore, if the injection speed is high and the injection gate speed is fast, the scouring of the mold will increase, the impact peak will increase, the impact force received by the mold will also increase, and the life of the mold will be greatly reduced.
Therefore, when we adjust the precision die-casting process, while ensuring the quality of the product, we should try to reduce the injection speed as much as possible. It is very important to improve the life of the mold and improve the economic benefits of the precision die-casting enterprise. At present, advanced precision die-casting machines are equipped with injection brakes, which are very beneficial to reduce the impact peak, reduce the impact force received by the mold, and improve the life of the mold.
During the use of the mold, the drape and aluminum skin should be arranged in time to avoid the mold from being squeezed. In the use of molds, due to various reasons, the molds will appear draped and aluminum skins. At this time, it is necessary to arrange them in time, otherwise the continuous production will crush the molds. Especially in the slider part, if the slideway enters the aluminum skin, etc., because the clamping force of the precision die-casting machine is very large, the slider will collapse and be crushed. When encountering such problems, it is necessary to sort out the mold in time, and find the cause to repair the mold in time. Otherwise, repairing when the mold is damaged will seriously affect the life of the mold.
Try to reduce the pouring temperature of molten aluminum and improve the service life of the mold. The pouring temperature of molten aluminum during the production of precision die casting not only affects the quality of castings, but also affects the service life of precision die casting molds. In general precision die casting, the pouring temperature of molten aluminum is between 630 degrees and 720 degrees. For different parts, when selecting the pouring temperature, we should try to choose a lower temperature, which not only saves power, but also extends the service life of precision die casting molds. number.
Strengthen the protection of the mold, regularly maintain it, and regularly temper the mold cavity to relieve stress. Precision die-casting molds have always been continuously produced under high pressure, high speed, and high temperature, and the operating conditions are relatively poor. In the process of use, the mold will be damaged or dangerous. Therefore, it is very important to strengthen the protection of the mold, regularly maintain the mold, replace the damaged parts, replace the wearing parts, and arrange the slideway, ejector hole, etc., to ensure the reliability of the mold in the production of precision die casting, the same is also true. It can extend the service life of the mold.