The popularity of hardware knowledge of aluminum quality is determined by four factors
Brief content: Regular aluminum manufacturers have internal standards when formulating alloy components. Within the range of various elemental contents, each factory has their own smaller range of variation, and the ratio between aluminum, magnesium and silicon is required. Very strict, each factory has its own data and keeps it secret.
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Alloying element
6063 alloy is an alloy composed of aluminum, magnesium and silicon as the main elements. Each element has a certain range of content, and the price of magnesium is high. In order to reduce costs, some manufacturers use less magnesium to the minimum allowable content. Some even worse, the magnesium content is lower than the minimum allowable content. In addition, the factory added waste wires and waste pot aluminum scrap pots in the alloy, which is basically not the 6063 alloy. The aluminum profile is mechanically low in strength and can be easily bent with two hands and one bend, commonly known as soft noodles. This is one of the reasons why aluminum can be cheaper for a few thousand dollars.
Regular aluminum manufacturers have internal standards when formulating alloy components. Within the range of various elemental contents, each factory has their own smaller range of variation. The ratio between aluminum, magnesium and silicon is very strict. Each factory has its own data and keeps it confidential. If the alloy is made of qualified formula, the quality can be guaranteed, otherwise the quality will not be improved in the future.
2. Aluminum alloy melting furnace
It is also crucial to have a good 6063 alloy for melting. The furnaces used in China are now in the 40's level, and also in the 1990s. The worst manufacturers use the original å© boiler. There are coal-burning, oil-burning, gas-fired and electrically heated melting furnaces. Some stoves have chimneys, and some have no chimneys. Generally used are square furnaces (rectangular furnaces), advanced ones are circular furnaces, and some circular furnaces can be inclined to pour aluminum water. On the tonnage of one ton, two tons, five tons, ten tons, twenty five tons and fifty tons of molten aluminum furnace. More advanced, add a static furnace under the aluminum melting furnace, the static furnace is important to prepare 6063 alloy, in which the slag can be degassed, allowed to stand, and then cast aluminum rod for extrusion. The quality of the alloys formulated in the original coal-fired furnaces and modern round furnaces is absolutely different. Generally, the furnace should have a chimney regardless of the fuel burned. Most of the waste gas generated from the combustion of the fuel can be discharged from the chimney. If no smoke from the chimney is melted in the aluminum water, the aluminum rod for extrusion is cast, and there is a serious slag bubble inside, which is one of the reasons for the poor quality of the aluminum, which is one of the reasons for the low price of aluminum.
3. Alloy casting
The level of domestic foundry equipment is also very different. The oldest casting equipment in China has iron mold casting in the 1940s and advanced semi-continuous casting in hydraulic pressure. The mold structure of the cast iron casting bar is very poor, and there are a lot of slag inclusions and bubbles in the cast rod. The quality of the cast rod is very poor. Nowadays, the general use of the factory is horizontal casting (also called continuous casting) and semi-continuous casting. Semi-continuous casting of most wire rope drives, the best hydraulic drive. Semi-continuous casting rods vary in length, typically 3 meters, 4 meters up to 8 meters. The semi-continuous casting is a pit type, which is lowered while casting, and is cooled by four sides with cold water. The crystal structure of the cast rod is uniform and fine due to uniform water cooling. However, the wire rope is driven downwards, which is not as smooth as the hydraulic transmission. The surface of the cast rod is more smooth than the surface of other cast rods. Smooth surface of the cast rod is one of the prerequisites for the extrusion of the profile. The surface of the cast rod is cast by other methods. The surface of the cast rod is rough. In order to ensure the quality of the profile, the cast rod is sometimes used first, and the car is used to cast the rough appearance of the rod. The commonly used semi-continuous casting mold is an advanced, hot-top and horizontal casting mold. The characteristics of this casting mold can be cast several to several dozen at a time, and the casting quality is good. With high-quality 6063 aluminum alloy casting rod In order to be able to produce a good aluminum profile, it is impossible to produce a good aluminum profile if it is impossible to cast a good cast bar with the original old casting equipment. There are many aluminum factories in China. There is no equipment for producing aluminum rods. Instead, they purchase 6063 alloy rods from electric aluminum plants or other factories. The aluminum products are in the hands of the production of cast rods and produce aluminum. It is difficult to achieve stable quality. The use of backward equipment is better than the use of advanced casting equipment. First, the investment is small and the production cost is low. This is one of the reasons why the aluminum sales price difference is large.
4. Profile extrusion
There are many types of profile extrusion machines in China, and the grades are very high and low, which is also the highest in the world. There are factories' own simple extruders, which are modified by squeezed plastic machines. There are a small number of domestically produced ones, and most of them are Taiwanese, devil's, American and German, with water pressure and oil pressure. In short, hundreds of domestic extruders are varied. It is generally believed that Devils, the United States, and Germany have better extruders, followed by Taiwan. Good and poor extruders, the same cast rods, the quality of the extruded profiles is no different. We often see 6063T5 for aluminum doors and windows in the building, which is the international standard for American brands.
The Chinese grades LD31RCS.T5 and RCS all indicate the state, indicating the artificial aging condition of air-cooling quenching. The quenching of the metal is quenching when the high temperature suddenly drops to a low temperature. For example, the steel blade is hardened and sharpened in the water, and the quenching of the aluminum is also quenched by water and quenched by air. The 6063 profile for construction is air-cooled and quenched, and the quenched aluminum material is placed in the aging furnace for a certain period of time, the internal crystal of the aluminum material is rearranged, and the mechanical strength is obviously improved. Among all metal alloys, only the aluminum alloy is in a aging state.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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