What are the requirements for mold control in precision casting manufacturers? In the die-casting process of casting molds, there are two different concepts of die-casting speed, namely injection speed and filling speed. The injection speed refers to the linear velocity of the injection punch driven by the pressure oil in the injection cylinder of the die-casting machine; The filling speed refers to the linear velocity at which liquid metal enters the mold cavity through the gate under pressure.

        The main function of the filling speed of casting molds is to quickly feed liquid metal into the mold cavity before solidification. Obtaining castings with clear contours and high surface quality is an important factor. Speed and pressure are two closely related process parameters. Therefore, in addition to appropriate injection specific pressure, the speed of the low-pressure mold should be selected correctly.

        The filling rate is determined based on the characteristics of the alloy and the structural properties of the casting. When the filling speed is low, the contour of the casting is unclear or even unable to form. When the filling speed is high, even with low injection specific pressure, castings with high surface quality can be obtained. However, excessively high filling speed can cause many technical defects and result in unfavorable die-casting conditions.

        Due to the high-speed flow of molten metal towards the front of the air, the low-pressure mold blocks the exhaust channel, causing air to wrap around the cavity and form bubbles. Atomizing molten metal into the mold cavity and adhering it to the wall of the casting mold prevents the molten metal from fusing and forming surface defects, thereby reducing the surface quality of the casting.

        The high-speed metal flow generates eddy currents, which first wrap the air and cold metal entering the mold cavity, causing the casting to produce pores and oxide inclusions; The high-speed metal flow washes the mold wall, accelerating the wear of the die-casting mold. So, casting molds have high precision, high complexity, good consistency, high productivity, and low consumption for molded parts.