With the rapid development of the industrial economy, the demand for lead die casting is increasing, and the die casting process is constantly improving.
The principle of the die-casting process is to use high pressure to press molten metal into a precision metal mold cavity at high speed, and the molten metal is cooled and solidified under pressure to form a casting. During the die-casting process, the speed is directly affected by the pressure, and together with the pressure, it plays an important role in the internal quality and the clarity of the surface profile. The speed has two forms: injection speed and gate speed.
The gate velocity is the linear velocity at which molten metal enters the cavity through the gate. The higher the gate speed, even if the lower specific pressure is used, the molten metal can quickly fill the cavity before solidification, to obtain a die-casting with clear contours and smooth surface, and to increase the dynamic pressure of the molten metal. If the gate speed is too high, it will also bring a series of problems. The main reason is that it is easy to envelop the gas to form bubbles; the molten metal enters the cavity as mist and adheres to the cavity wall and the subsequent molten metal cannot be fused to form surface defects. And oxidation inclusions, accelerate the wear of the die-casting mold, etc.
Of course, the influence of zinc die casting is also very important.