How to choose aluminum profiles for construction

by:Zeyi     2021-08-20
After a short period of more than 10 years, my country's construction aluminum profiles have gradually become the world's first, from aluminum profiles, aluminum doors and windows, aluminum curtain walls to hidden frame glass curtain walls. The main reasons for the rapid development of aluminum profiles for construction in our country are: the introduction of foreign aluminum and aluminum door and window production lines, the use of foreign experts, and insist on digestion and absorption. Here is a brief introduction on how to distinguish the pros and cons of aluminum and aluminum alloy doors and windows for your reference.  1. How to choose aluminum profiles: Due to various conditions, many domestic aluminum profile manufacturers produce large differences in aluminum material materials, and there are also large differences in sales prices, which can be 4 to 5 thousand yuan per ton. The domestic price of aluminum ingots is basically the same. In the process of processing, there is such a big price difference, and there is definitely a big difference in quality. The quality of aluminum profiles is determined by the following major factors: 1. Alloying elements: 6063 alloy is an alloy prepared with 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 aluminum profile manufacturers reduce the amount of magnesium to the minimum allowable content. What's more, the magnesium content is reduced below the minimum allowable content. Other aluminum profile manufacturers add waste wires and waste aluminum pots to the alloys, but 6063 alloy is basically not mentioned. As a result, the mechanical strength of the aluminum profile is very low, which can be so low that it can be bent with two hands. It is commonly known as soft as noodles. This is one of the reasons why aluminum profiles can be thousands of dollars cheaper. Regular aluminum manufacturers have internal standards when preparing alloy components, and the amounts are within the range of various elements. Each factory has its own smaller range of changes. 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. The aluminum alloy smelting furnace is equipped: how to melt the 6063 alloy and what kind of furnace is used. This is also very important. Now domestic furnaces are used in the 1940s and 90s. The worst manufacturers use the original crucible boilers. . There are coal-burning, oil-burning, gas-burning and electric heating smelting furnaces. Some stoves have chimneys, and some have no chimneys. The most commonly used are square furnaces (rectangular furnaces), the advanced ones are round furnaces, and some round furnaces can be tilted to pour molten aluminum. According to the tonnage, there are 1 ton, 2 ton, 5 ton, 10 ton, 25 ton and 50 ton aluminum melting furnace. More advanced, add a static furnace below the aluminum melting furnace, which is mainly used for preparing 6063 alloy. The furnace can be used for slagging and degassing, standing, and then casting aluminum rods for extrusion. 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 and 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 more 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. 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.  
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