1. Alloy elements
6063 alloy is an alloy with Al Mg Si as the main element. Each element has a certain range of content. The price of magnesium is high. In order to reduce the cost, some manufacturers reduce the amount of magnesium to the allowable content. In some cases,
the content of magnesium is lower than the allowable content. There are also factories in the alloy with waste wires and waste pots, waste aluminum pot, basically not 6063 alloy. As a result, the mechanical strength of aluminum profile is very low, which
can be bent easily with two hands. It is commonly known as soft as noodles. This is one of the reasons why aluminum is cheap by thousands of yuan.
2. Aluminum alloy melting furnace
How to melt the 6063 alloy and what kind of furnace to use
are also very important. At present, the furnaces used in China are at the level of 1940s and 1990s, and the poor manufacturers use the original crucible boilers. There are coal burning, oil burning, gas burning and electric heating melting furnaces.
Some stoves have chimneys, others have no chimneys. Generally, the square furnace (rectangular furnace) is used, and the advanced one is round furnace. Some round furnaces can pour molten aluminum obliquely. In terms of tonnage, there are one ton, two
tons, five tons, ten tons, twenty-five tons and fifty tons aluminum melting furnaces. For the more advanced one, a static furnace is added under the aluminum melting furnace. The static furnace is mainly used for preparing 6063 alloy. The slag and gas
can be removed in this furnace, and then the aluminum rod and ceiling can be cast for extrusion. The quality of the alloy prepared in the original coal-fired furnace and the modern round furnace is absolutely different. No matter what kind of fuel is
emitted from the flue gas, most of the fuel can be discharged from the furnace. If the waste gas and slag of the chimney are all melted in the aluminum water, there will be serious slag bubbles inside the aluminum rod for extrusion, which is one of the
reasons for the poor quality of aluminum and the low price of aluminum. Color coated aluminum roll
3. Alloy casting
The level of domestic casting equipment is also very different. The older casting equipment in China is iron mold casting of
1940s level, and the advanced one is hydraulic semi continuous casting. In most continuous casting plants, there is a good quality difference between continuous casting and semi continuous casting. The length of semi continuous casting bars varies from
3 m, 4 m to 8 M. Semi continuous casting is pit type, casting while falling, four sides with cold water cooling, because the water cooling is uniform around, casting rod crystal structure is uniform and fine. However, the downward transmission of wire
rope is not as smooth as hydraulic transmission, and the surface of hydraulic casting rod is smoother than other casting rods. Smooth surface of casting bar is one of the preconditions for extrusion. In order to ensure the quality of the profile, sometimes
the rough surface of the cast bar is removed by turning a knife first. Now the commonly used semi continuous casting mold is the advanced, hot top casting mold with the same level. This kind of casting mold has the characteristics of pouring several to
dozens of pieces at a time, and the casting quality is good. With high-quality 6063 aluminum alloy casting rod, it is possible to produce good aluminum profiles. If it is impossible to cast good casting rods with the original and old casting equipment,
it is impossible to produce good aluminum molds at all Wood. There are a lot of aluminum factories in China. They do not have the equipment to produce aluminum rods, but purchase 6063 alloy bars from aluminum plants or other factories. In such aluminum
plants, the quality of aluminum materials is controlled by the manufacturers of Casting Bars, so it is difficult to achieve stable quality of aluminum products. Compared with the advanced casting equipment, the backward equipment has the advantages of
small investment and low production cost, which is one of the reasons why the price difference of aluminum products is large
4. Profile extrusion
There are many kinds of profile extruders in our country, and there is a wide gap between them.
There are factory's own simple extruders, some of which are modified by plastic extruders, a small number of which are made in China, followed by most of which are made in Japan, the United States and Germany, and some of which are hydraulic and hydraulic.
In short, there are hundreds of extrusion machines in China. It is generally believed that Japan, the United States and Germany have better extruders, followed by Japan. Good and bad extruders, the same casting rod