[China Aluminum Network] low pressure casting In low pressure casting, the mold is placed on a closed furnace. Underneath the cavity, a tube (called a liquid riser) is connected to the liquid in the furnace. If pressurized air is added to the metal surface of the furnace, molten metal will flow from the riser into the cavity. After the molten metal solidifies, the compressed air in the furnace is released and the unsolidified metal flows back from the liquid riser to the furnace. By controlling the pressure and velocity of the air flowing into the furnace, it is possible to control the velocity and pressure of the metal flowing into the cavity, and to allow the metal to crystallize under pressure. This process is characterized by the crystallization of the casting under pressure, dense structure, good mechanical properties and high metal utilization. The low-pressure casting process is currently quite mature in mainland China. It is suitable for low-person production management and has been recognized by all automakers as the mainstream process for manufacturing aluminum wheel hubs in mainland China. The products are mainly sold to OEMs and overseas retail markets. Aluminum alloy wheels manufactured by low-pressure casting process have spokes that are cooled and solidified later. Therefore, the spokes of some special-shaped hubs are prone to shrinkage and other quality problems, while the rim parts have better strength due to earlier crystallization. Squeeze Casting Squeeze casting, also known as liquid forging, is a new process that integrates the characteristics of casting and forging. The process involves pouring a certain amount of metal liquid directly into an open metal mold and applying a certain pressure through the punch. On the liquid metal, it is filled, shaped and crystallized and solidified, and a certain amount of plastic deformation occurs during the crystallization process. Squeeze casting is stable, there is no turbulence and no wrapping gas, the metal is crystallized and solidified directly under pressure, so the casting will not produce casting defects such as pores, shrinkage holes and shrinkage, etc., and the structure is dense, grain refinement, mechanical properties. Higher than low pressure castings. The products have excellent mechanical properties close to the forgings, high efficiency and high precision with precision forming of the precision castings, and the investment is much lower than the low pressure casting method. The disadvantage is that liquid forging products, like traditional forged products, require milling to finish the spokes. In Japan, a considerable number of automotive aluminum wheels are produced using the squeeze casting process. Toyota Motor Co., Ltd. has more than ten fully-automatic squeeze casting equipment. Each piece of equipment can produce an aluminum wheel in less than 2 minutes, from pouring the molten metal to removal. The entire process of castings is controlled by computers and the degree of automation is very high. China has also built a modern aluminum alloy wheel hub plant for squeeze-casting in Guangdong. It has produced aluminum wheels of various specifications and models, and the quality of its products has reached the advanced level of similar foreign products. At present, all countries in the world use squeeze casting as one of the directions for the production of automobile aluminum wheels. Spinning Casting sub-"low pressure casting + spinning" and "gravity casting + spinning" two processes. At present, the Korean automotive companies have adopted the trend of “low pressure casting + spinning†in the molding process of aluminum wheels. There are also other products in this series that are in demand for this process. This process is the mainstream process in the casting process and is used as an OEM product. Most of the companies are using this kind of process; at the same time, a small number of companies that do overseas retail markets adopt the "gravity casting + spinning" process, and in theory this process is straightforward and it really puts The strengths of gravity casting and spinning are combined and the product quality is improved. However, because the blank is produced by the gravity casting process, the economics of this process are very poor and the production cost is high. In a word, the product of casting screw, because the spoke part is cast out, it has the same advantages and disadvantages as the product produced by the casting process; and the rim part is spin out, so the airtightness is better. Casting rotary products can theoretically reduce weight, but the actual application of the effect is not obvious. Conventional forging Forging is one of the earlier forming processes for aluminum hub applications. Forged aluminum wheels have the advantages of high strength, good corrosion resistance, accurate dimensions, and small processing volume. In general, the weight of the forged aluminum hub is only equivalent to 1/2 or less of the same size steel wheel. The flow direction of the grain of the forged aluminum hub is consistent with the direction of the force, and the strength, toughness and fatigue strength of the forged aluminum hub are significantly better than those of the cast aluminum hub. At the same time, the performance is very reproducible and almost every hub has the same mechanical properties. The typical elongation of a forged aluminum hub is 12% to 17%, so it can absorb road vibration and stress. Casting hubs usually have a very strong ability to withstand compression, but they are far less able to withstand impact, shear and tensile loads than forged aluminum wheels. Forged wheels have a higher strength to weight ratio. In addition, the surface of the forged aluminum hub has no air holes, so it has a very good surface treatment capability, which not only guarantees uniform and consistent coating, but also has a solid combination and good color. The major disadvantage of forged aluminum wheels is the large number of production processes and the production costs are much higher than that of the cast. Grow Light For Indoor Plants 220w
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