What are the determinants of aluminum profile quality?

by:Zeyi     2021-06-08
Aluminum profiles are more and more widely used in life. So, what are the determinants of aluminum profile quality? The editor tells everyone:   1. Alloy 6063 alloy is an alloy prepared with aluminum, magnesium and silicon as the main elements. Each element has a certain range of content. The price of magnesium is high. In order to reduce costs, some manufacturers use magnesium Use as little as the minimum allowable content. Even worse, the magnesium content is lower than the minimum allowable content. Some factories add waste wires and waste aluminum pots to the alloy, basically not talking about 6063 alloy. As a result, the mechanical strength of the aluminum profile is very low, it can be so low that it can be easily bent with both hands, and it is commonly known as soft as noodles. This is one of the reasons why aluminum can be thousands of dollars cheaper. Regular aluminum manufacturers have internal standards when formulating alloy components, that is, within the range of various element content, each factory has its own smaller range of changes, and the ratio of aluminum, magnesium, and silicon is very strict. Each factory has its own data and keeps each other confidential. Only the alloy made with qualified formula can guarantee the quality, otherwise the quality will not be improved on how to process it in the future. 2. How to melt the 6063 alloy equipped with aluminum alloy melting furnace and what furnace to use is also very important. Now domestic furnaces are used in the 1940s and 90s. The worst manufacturers use the original crucibles. boiler. There are coal-burning, oil-burning, gas-burning and electric heating smelting furnaces. Some stoves have chimneys, and some have no chimneys. Generally, square furnaces (rectangular furnaces) are generally used, and the advanced ones are circular furnaces. Some circular furnaces can be tilted to pour molten aluminum. In terms of tonnage, there are one, two, five, ten, twenty-five, and fifty-ton aluminum melting furnaces. More advanced, add a static furnace below the aluminum melting furnace, which is mainly used for preparing 6063 alloy, which can be used for slagging and degassing in this furnace, standing, and then casting aluminum rods for extrusion use. The quality of the alloy prepared in the original coal-fired furnace and the modern round furnace is absolutely different. Generally, furnaces should have a chimney no matter what fuel is burned. Most of the waste gas and slag produced during the combustion of the fuel can be discharged from the chimney. If all the flue gas and waste slag are melted in the aluminum water, so that the aluminum rod for extrusion is cast, there are serious slag bubbles inside, which is one of the reasons for the poor quality of aluminum, which is also one of the reasons for the cheap aluminum price.  3, alloy casting  , the level of domestic casting equipment is also very different. The oldest domestic casting equipment is iron mold casting at the level of the 1940s, and the advanced one is hydraulic semi-continuous casting. The crystalline structure of iron mold casting rods is very poor, and there are a lot of slag and bubbles in the rods, and the quality of the rods is very poor. Nowadays, horizontal casting (also called continuous casting) and semi-continuous casting are commonly used in general factories , Semi-continuous casting most of the wire rope transmission, the best hydraulic transmission. The length of semi-continuous casting rods varies, generally from 3 meters, 4 meters to 8 meters. Semi-continuous casting is a pit type. It is lowered while casting, and is cooled with cold water on all sides. Due to the uniform water cooling, the crystal structure of the casting rod is uniform and fine. However, the downward transmission of the steel wire rope is not as stable as the hydraulic transmission. The surface of the hydraulic casting rod is smoother than other casting rods. The smooth surface of the cast rod is one of the prerequisites for extruding a good profile. The surface of the cast rods cast by other methods is relatively rough. In order to ensure the quality of the profile, sometimes the cast rods are cut first to remove the rough appearance of the cast rods. The commonly used semi-continuous casting molds are advanced, hot-top-level casting molds. The characteristics of this casting mold can cast several to dozens at a time. At the same time, the casting quality is good, and there are high-quality 6063 aluminum alloy casting rod In order to be able to produce good aluminum profiles, if it is impossible to cast good cast rods with the original outdated casting equipment, it is impossible to produce good aluminum profiles at all. There are many aluminum factories in China that do not have the equipment to produce aluminum rods. Instead, they purchase 6063 alloy rods from electric aluminum factories or other factories. For such aluminum factories, the quality of aluminum is in the hands of the casting rod factory, and the aluminum produced It is difficult to achieve stable quality of materials. Compared with advanced casting equipment, the use of backward equipment is that the investment is small and the production cost is low, which is one of the reasons why the sales price difference of aluminum is large. The 6063 profile used in construction is quenched by air cooling. The quenched aluminum is placed in an aging furnace for a certain period of time, the internal crystals of the aluminum are rearranged, and the mechanical strength is significantly improved. Among all the metal alloys, only aluminum alloy has a aging state.
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