The functional structure design of Die Casting
Time：
2021-01-29 13:34
Die Casting is a kind of pressure-casting part. It uses a pressure-casting mechanical die-casting machine equipped with a casting mold to pour liquid copper, zinc, aluminum or aluminum alloy into the inlet of the die-casting machine, and then die-cast by the die-casting machine , Casting copper, zinc, aluminum parts or aluminum alloy parts with the shape and size constrained by the mold. Die Casting functional structure design is the core of Die Casting structure design. It determines the size, wall thickness and shape required to realize the function of Die Casting, and checks the deformation, fatigue, wear, etc. of Die Casting during static load or dynamic load use. To meet the stability of its use. Designing the functional structure of Die Casting requires not only the quality and technical ability of mechanical structure design and machining, but also comprehensive basic knowledge of die-casting alloy, die-casting molding process, and die-casting mold design to make the design The functional structure can meet the various technical requirements specified by Die Casting and the functions and performance within the service life, and it is reliable and economical.
1. Stress
Pressure is the basic feature of die-casting process. The filling flow and compaction of molten metal are all completed under the action of pressure. Pressure is divided into dynamic injection force and pressurized injection force. The function of dynamic injection force is to overcome various resistances and ensure that the molten metal reaches a certain speed during filling. The function of pressurized injection force is to compact Die Casting after filling, increase the density of Die Casting, and make the outline of Die Casting clear. The injection force exerts pressure on the molten metal through the injection punch.
2. Expanding force
During the die-casting process, under the action of specific pressure, when molten metal fills the cavity, a certain pressure is applied to the cavity wall and parting surface, which is called expansion force. At the end of the die-casting process, that is, when the pressurized specific pressure is transmitted to the die-casting mold through the molten metal, the expansion force is relatively large, which is an important parameter for the strength and rigidity check of the die-casting machine model and support plate for Die Casting. In the process of speed die-casting, speed is directly affected by pressure, and together with pressure, it plays an important role in internal quality and surface contour definition. The speed has two forms: injection speed and gate speed.
3. Injection speed
The injection speed is also called the punch speed. It is the speed at which the injection punch in the pressure chamber pushes the molten metal, that is, the speed of the injection punch. The injection speed changes during the injection process. It can be divided into two stages, low speed and high speed. The speed control valve of the Die Casting machine can be used for stepless speed regulation. Inner gate speed Inner gate speed is the linear velocity at which molten metal enters the cavity through the inner gate. Higher gate speed, even with lower specific pressure, can quickly fill the cavity with molten metal before solidification, obtain Die Casting with clear outline and smooth surface, and increase the dynamic pressure of molten metal. If the gate speed is too high, it will also bring a series of problems, mainly because it is easy to envelop the gas to form bubbles; the molten metal enters the cavity in 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.
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