Pressure is the basic characteristics of Die Casting pr […]
Pressure is the basic characteristics of Die Casting process, filling and flow of liquid metal and compaction are done under the pressure. Pressure is divided into dynamic pressure injection and boost pressure injection. The role of dynamic pressure injection is to overcome all kinds of resistance, to ensure filling liquid metal reaches a certain speed. The role of pressurized injection pressure is after the end of the filling of the die-casting compaction to improve the density of die-casting parts, so die-casting outline clear. Injection pressure The pressure of the molten metal through the injection punch.
Die casting process, the role than the pressure, the liquid metal filling cavity, the cavity wall and parting surface of a certain pressure, known as the expansion force. In the final stage of the die-casting process, the supercharging pressure is transferred to the die-casting die through the molten metal, and the bulging force is the largest, which is an important parameter for checking the strength and rigidity of the die-casting machine primary die-casting machine model and the supporting plate.
Speed die casting process, the speed of the direct impact of pressure, but also together with the pressure on the internal quality, surface contour clarity plays an important role. Speed of injection speed and gate speed in two forms. Injection speed Injection speed, also known as the punch speed, which is the pressure of the injection chamber to promote the liquid metal moving speed, which is the speed of injection punch. Shot during injection speed is changing, it can be divided into two stages of low speed and high speed, speed control valve through the die casting machine can be stepless speed regulation.
The inner gate speed is the linear velocity of the molten metal through the gate into the cavity. The higher gate speed, even at lower specific pressures, allows liquid metal to quickly fill the cavity prior to solidification, resulting in clear, smooth-surfaced die-castings and increased dynamic pressure of molten metal. When the speed of the inner gate is too high, a series of problems will also be brought about, which is mainly that it is easy to wrap the gas to form bubbles; the molten metal enters into the cavity in the form of a mist and adheres to the cavity wall and the subsequent molten metal can not fuse to form surface defects And oxidation inclusions, accelerated die-casting mold wear and so on.