Related factors that affect the quality of aluminum coil
Release time:2019-8-27 15:22:28      Hit count:1640

We've learned a lot about the properties of aluminum coil plates, or some practical tips, and today we're going to share what factors can cause problems or changes in the quality of aluminum coil plates.

1. Alloy elements:

6063 alloy is prepared with aluminum-magnesium-silicon as the main element, each element has a certain range of content, and the price of magnesium is high. Some manufacturers are cutting costs by reducing the amount of magnesium they use to less than the permissible value. Some even go so far as to lower magnesium levels than the lower levels allowed. Some factories add waste wires and aluminum POTS in the alloy, which is hardly 6063 alloy. Cause aluminum profile mechanical strength is very low, can be low enough to bend easily with both hands, commonly known as soft as noodles. That's one of the reasons why aluminum is thousands of dollars cheaper.

2. Aluminum alloy melting furnace:

Match the 6063 alloy how to melt, with what furnace, it is also crucial, now the domestic use of the furnace has the level of the 1940s, also have the level of the 1990s, smaller manufacturers with the original crucible boiler. There are melting furnaces that burn coal, oil, gas and electricity. Some stoves have chimneys, others have no chimneys. Generally used for square furnace (rectangular furnace), advanced for the circular furnace, some circular furnace can tilt pour aluminum water. There are one ton, two tons, five tons, ten tons, twenty-five tons and fifty tons of molten aluminum furnaces. More advanced, add a static furnace and static furnace under the molten aluminum furnace to prepare 6063 alloy, which can be used to remove slag and gas in the furnace, and then cast aluminum rod and aluminum ceiling for extrusion. The quality of the alloy prepared in the original coal-burning furnace and the modern circular furnace is absolutely different. In general, no matter what kind of fuel is burned, it should have a chimney, most of the waste gas and residue generated in the combustion process can be discharged from the chimney. If no flue gas and waste residue are melted in aluminum water, the aluminum bar for extruding is cast in this way, and there are serious slag bubbles inside, which is one of the reasons for the poor quality of aluminum, and one of the reasons for the low price of aluminum.

3. Alloy casting:

The level of domestic casting equipment is also quite different. The older casting equipment in China is iron casting in the 1940s, and the advanced one is hydraulic semi-continuous casting. Iron mold casting rod crystal structure is poor, and in the casting rod there are a lot of slag and bubbles, casting rod quality is poor, now the general factory used more commonly, horizontal casting (also known as continuous casting) and semi-continuous casting, semi-continuous casting most wire rope drive, the best hydraulic drive. The length of the semi-continuous cast rods varies from 3 m to 4 m to 8 m. Semi - continuous casting is pit - type, while casting while falling, with cold water on all sides of the cooling, because the water cooling all around, the crystal structure of the cast rod uniform fine. But wire rope downward transmission, not as smooth as hydraulic transmission, hydraulic casting rod surface than other casting rod surface are smooth. The smooth surface of the cast rod is one of the prerequisites for extrusion. Using other methods to cast the surface of the bar is relatively rough, in order to ensure the quality of the profile, sometimes on the first casting bar a knife, car to cast the bar rough appearance. Now commonly used semicontinuous casting mould for advanced, thermal crown at the casting mould, the characteristics of the casting die casting a can fill several root to dozens of root, casting quality at the same time, with the high quality of 6063 aluminum alloy casting rod, can produce good aluminum likely, if cast in the original old casting equipment, casting out of good quality, may not be able to produce a good aluminum. Many aluminum factories in China do not have the equipment to produce aluminum rods. Instead, they purchase 6063 alloy rods from electric aluminum factories or other factories. In such aluminum factories, the quality of aluminum is controlled by the bar casting factories, and the quality of aluminum produced is difficult to achieve stability. With backward equipment than advanced casting equipment, one is the investment is small, low production costs, which is why the aluminum sales price difference is one of the reasons.

4. Profile extrusion:

There are many kinds of extruders in our country, and the grade is greatly different. There are factories with their own simple extruders, some with plastic extrusion machine transformation, a small number of domestic, followed by most of Taiwan, Japan, the United States and Germany, with water pressure, oil pressure. In short, hundreds of extruders are various. It is generally believed that the extruders of Japan, the United States and Germany are better, followed by those of Taiwan. Better and worse extruders, the same cast bar, extruded profile quality is not the same. We often see building aluminum doors and Windows with 6063T5, which is the American brand international general.

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