Minimum Rising Speed of Steel Liquid in Mould Cavity during Die Casting
Die casting is a metal-forming process in which a mold is injected with molten metal at high pressure. In order to reduce casting defects and improve the quality of die casting products, one of the most important factors that needs to be considered is the minimum rising speed of steel liquid in the mould cavity during die casting. This paper mainly introduces the influence of minimum rising speed of steel liquid in the mould cavity on die casting, and the characteristics of different mould cavity rising speeds.
Minimum rising speed of steel liquid refers to the highest speed of steel liquid rising in the mould cavity during the die casting. The steel liquid rising speed is affected by many factors during die casting, such as the viscosity of the steel liquid, the pressure of the molten steel, the shape of the mould cavity, and the flow resistance of the steel liquid, etc. It is also affected by the temperature of the mould, the size of the gate and the size of the pouring hole. All of these factors have an important influence on the rising speed of steel liquid, and the ideal rising speed of steel liquid should not be too fast or too slow.
The speed of steel liquid in the mould cavity rising is generally related to the size of the mould cavity. The bigger the mould cavity is, the faster the steel liquid will rise. At the same time, the shape of the mould cavity also has an important influence on the rising speed of the steel liquid. If the mould cavity is too deep and narrow, the steel liquid may not rise at all, resulting in casting defects. On the other hand, if the mould cavity is too shallow and wide, the steel liquid will rise too quickly, causing some parts of the die casting to be unevenly filled, resulting in defects.
Therefore, in order to obtain a better die casting effect, it is necessary to control the minimum rising speed of steel liquid in the mould cavity. Generally speaking, the speed of the steel liquid rising should not exceed 0.6 m/s for a small mould cavity with a depth of less than 60 mm and a width of 50 mm. For larger mould cavities with an depth of more than 60 mm and a width of more than 50 mm, the rising speed of the steel liquid should not exceed 0.2 m/s. In addition, if the temperature of the mould is too high or too low, it will also affect the speed of the steel liquid rising, so the temperature of the mould needs to be monitored and adjusted accordingly.
In conclusion, the minimum rising speed of steel liquid in the mould cavity during die casting is an important factor which affects the quality of the die casting product. Therefore, when selecting the mould, it is necessary to consider the size and shape of the mould cavity, so as to ensure that the rising speed of the steel liquid is suitable for the actual application. In addition, the temperature of the mould should be strictly monitored and regulated, so as to ensure the normal rising speed of the steel liquid.
