Cast aluminum The aluminum suitable for the die-casting process is die-cast aluminum, usually die-cast aluminum alloy. It has high-tech core pulling and cooling system.Typically, material is fed into a mold cavity through a central inlet for casting to form a part. How to understand the main advantages of cast aluminum?

1. Good product quality:

The dimensional accuracy of cast aluminum parts is relatively high, generally equal6~7, even up to 4. The surface finish is good, generally equivalent to 5~8; the strength and hardness are higher, the strength is usually 25% to 30% higher than that of sand casting, but the elongation is reduced by about 70%. It has stable dimensions and good interchangeability; it can cast aluminum thin-walled complex castings. For example, at present, the small wall thickness of zinc alloy cast aluminum parts can reach 0.3mm; aluminum alloy castings can reach 0.5mm; the aperture of small castings is 0.7mm; the small spacing is 0.75mm.

2. High production efficiency:

High machine productivity. For example, the average household aluminum casting machine can cast aluminum in eight hours.600-700 times, while the small hot chamber aluminum casting machine can cast aluminum 3000-7000 times. Long service life of cast aluminum mold. The life of a pair of cast aluminum molds and cast aluminum watch alloys is hundreds of thousands or even millions of times. Easy to achieve mechanization and automation.

3. Excellent economic benefits:

Due to the precise dimensions of the cast aluminum parts, the surface is smooth and clean. Usually, it is not used for machining but is used directly, or the amount of processing is small, which not only improves the utilization rate of the metal, but also reduces a lot of processing equipment and working hours; the casting price is cheap; the combination of cast aluminum can be used with other metals or Non-metallic materials are used in combination. It not only saves assembly man-hours, but also saves metal.

In addition, shrinkage cavities and shrinkage porosity are easily generated during the aluminum casting process. The basic principle of aluminum casting manufacturers to prevent shrinkage cavities and shrinkage pores is to formulate the correct casting process according to the shrinkage and solidification characteristics of the alloy, so that the casting can establish good shrinkage conditions during the solidification process and make it possible to cure. Reduce porosity as much as possible. Holes and shrinkage cavities occur during casting solidification. In this way, a riser of a certain size is placed at the position where the aluminum casting solidifies, and the aluminum casting concentrates the shrinkage cavity in the riser, or the gate is opened at the solidification position to feed directly. In order to establish good feeding conditions during the solidification process of the casting, the main reason is to control the solidification direction of the casting to make it conform"Principle of Directional Solidification" or "Principle of Simultaneous Solidification".

The introduction position of the gate system has an important influence on the temperature distribution of cast aluminum castings. Adjusting the casting temperature and casting speed of the liquid metal can enhance directional solidification or simultaneous solidification.