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影响彩涂铝卷铝材质量的几大要素

返回列表 来源: 发布日期: 2020.12.25

影响彩涂铝卷铝材质量的几大要素

1合金元素
彩涂铝卷铝材6063合金是以Al-Mg-Si为主元素的合金。每个元素都有一定的内容范围。镁的价格很高。为了降低成本,一些制造商将镁的含量降低到允许的含量。在某些情况下,镁的含量低于允许的含量。还有工厂里的合金用废电线和废花盆、废铝花盆,基本上都不是6063合金。因此,铝型材的机械强度很低,双手很容易弯曲。俗称软如面。这也是铝价格便宜几千元的原因之一。
2 彩涂铝卷铝材铝合金熔炼炉

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如何熔化6063合金以及使用什么样的熔炉也非常重要。目前,我国使用彩涂铝卷铝材的炉子处于上世纪四九十年代的水平,落后的厂家使用的是原坩埚锅炉。有燃煤、燃油、燃气和电热熔化炉。有些炉子有烟囱,有些没有烟囱。一般采用方形炉(矩形炉),先进的是圆炉。有些圆形熔炉可以倾斜地浇注熔化的铝。按吨位计算,有1吨、2吨、5吨、10吨、25吨和50吨的熔铝炉。较先进的一种是在熔铝炉下增设一个静止炉。静态炉主要用于制备6063合金。炉内除渣、除气后,再铸铝棒和铝顶棚进行挤压。在原来的燃煤炉和现代的圆炉中制备的合金质量是完全不同的。无论从烟气中排出何种燃料, 彩涂铝卷铝材大部分燃料都能从炉内排出。如果烟囱的废气和炉渣全部在铝水中熔化,挤压用铝棒内部会产生严重的渣泡,这是铝质量差、铝价格低的原因之一。彩涂铝辊
三。合金铸件
国产铸造设备的水平也相差很大。我国较老的铸造设备是40年代水平的铁模铸造,先进的是液压半连续铸造。在大多数连铸厂,连铸和半连铸的质量差别很大。半连续铸棒长度为3m、4m~8m不等,半连续铸造为坑式,边落边浇,四面冷水冷却,由于四周水冷均匀,铸棒晶体结构均匀、细小。但是,钢丝绳向下传动不如液压传动平稳,液压铸棒表面比其他铸棒表面光滑。铸棒表面光滑是挤压成形的前提条件之一。为了保证型材的质量,有时需要先转动刀具去除铸棒的粗糙表面。目前常用的半连续铸造结晶器是先进的、具有同等水平的热顶铸造结晶器。这种铸造模具具有一次浇注数件至几十件的特点,铸件质量好。采用优质6063铝合金铸棒,可生产出性能优良的铝型材。如果用原有的和旧的铸造设备无法铸造出好的铸棒,那么完全不可能生产出好的铝模。中国有很多铝厂。他们没有生产铝棒的设备,但从铝厂或其他工厂购买6063合金棒。在这样的铝厂,铝材的质量是由铸棒生产厂家来控制的,因此很难实现铝制品的稳定质量。与先进的铸造设备相比,落后的设备具有投资小、生产成本低等优点,这也是铝制品价差大的原因之一
4型材挤压
我国型材挤出机种类繁多,与国外相比差距较大。有工厂自己的简易挤出机,有的是塑料挤出机改造的,少数是中国制造的,其次是日本、美国、德国制造的,还有一些是液压和液压的。简而言之,中国有上百台挤出机。一般认为,日本、美国和德国的挤出机性能较好,其次是日本。

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

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