How are the process parameters controlled during Aluminum Alloy Die Casting?
Publish Time: 2024-10-16
Aluminum Alloy Die Casting is an efficient metal forming process. When producing products such as jack strut parts, the control of process parameters is crucial.
The first is pressure control. During the die casting process, the size of the pressure directly affects the filling speed and filling effect of the aluminum alloy liquid. Generally speaking, the appropriate pressure needs to be determined based on the performance of the die casting machine, the structure of the mold, and the shape and size of the product. At the beginning of the filling stage, a lower pressure is usually used to allow the aluminum alloy liquid to enter the mold cavity smoothly to avoid defects such as injection and air entrainment. As the filling progresses, the pressure is gradually increased to ensure that the aluminum alloy liquid can fully fill every corner of the cavity, especially some thin-walled and complex structure parts. In the pressure holding stage, maintaining a certain pressure helps to compensate for the shrinkage of the aluminum alloy liquid during the solidification process and improve the density and dimensional accuracy of the product.
Temperature is also one of the key process parameters. Including the pouring temperature of the aluminum alloy liquid and the temperature of the mold. If the pouring temperature is too high, it is easy to cause oxidation and air absorption of the aluminum alloy liquid, increasing the porosity defects of the product; if the pouring temperature is too low, the fluidity of the aluminum alloy liquid will deteriorate, making it difficult to fill the cavity, resulting in defects such as cold shut and insufficient pouring. Usually, the pouring temperature of the aluminum alloy liquid is controlled within a certain range, and the specific value depends on the type of aluminum alloy and the requirements of the die-casting process. The mold temperature also has an important influence on the product quality. If the mold temperature is too low, the aluminum alloy liquid will cool and solidify rapidly in the cavity, resulting in defects such as cold lines and cracks on the surface of the product; if the mold temperature is too high, it will reduce production efficiency and increase thermal fatigue damage to the mold. Therefore, it is necessary to control the mold temperature through the mold cooling system to keep it within the appropriate range.
The control of the injection speed is equally important. The injection speed is divided into slow injection speed and fast injection speed. The slow injection speed is mainly used to guide the aluminum alloy liquid to enter the gate smoothly, reduce air entrainment and oxidation; the fast injection speed is used to fill the aluminum alloy liquid into the cavity in a short time. The selection of the injection speed needs to comprehensively consider factors such as the structure, wall thickness and fluidity of the aluminum alloy liquid. For thin-walled products, a higher injection speed is required to ensure that the aluminum alloy liquid can quickly fill the cavity; for thick-walled products, the injection speed can be appropriately reduced to avoid defects such as spraying and flash.
In addition, parameters such as injection time and holding time also need to be precisely controlled according to the characteristics of the product and process requirements. If the injection time is too short, the aluminum alloy liquid may not be fully filled; if the holding time is too short, the solidification shrinkage of the product cannot be fully compensated, which will affect the dimensional accuracy and mechanical properties of the product.
In short, in the Aluminum Alloy Die Casting process, high-quality products such as jack support parts can be produced through precise control of process parameters such as pressure, temperature, speed, and time. This requires die-casting process personnel to have rich experience and professional knowledge, and at the same time combine advanced die-casting equipment and molds to continuously optimize process parameters and improve product quality and production efficiency.
