ã€China Aluminum Network】 Mobile phones have become a communication tool for people, especially for workers. They are almost hand-to-hand, and some people even have two or three or more, but their body is made of what materials. Not everyone is crystal clear.
Among the smart phones produced by the world's three major mobile phone production groups (Apple, Samsung, and Huawei), aluminum is used, titanium is used, and magnesium is used. The titanium body is bright and strong, but the price is higher, the density is also higher, 66.7% larger than that of aluminum; the density of magnesium is small, 36% lighter than that of aluminum, and has a silver tone color tone, but the strength is lower than that of aluminum. Low, corrosion resistance is also far less than aluminum, the price is more expensive than aluminum.
Therefore, aluminum is the current smart phone body material with better overall performance and better cost performance. At the same time, it is also superior to titanium and magnesium in its recyclability and recyclability. The author here says that aluminum, magnesium and titanium contain various alloys.
We know that Apple's mobile phone size - the size of the screen has increased from the iphone 5 again and again, giving unprecedented visual satisfaction, watching the phone has become a wonderful enjoyment, now added to 140mm (5.5 inches). But the initial large-screen mobile phone body material did not improve synchronously, while the thickness of the fuselage is still thinning, resulting in iphone mobile phone body is subject to external impact on the deformation, and even become curved, sometimes accidentally will put it down The baby's cell phone bends, and in some cases, the screen may also be beaten to pieces. This situation has not been fundamentally changed since the arrival of the iphone 6 plus. Apple has been subjected to increasing market pressure and complaints from users are increasing.
7075-type alloy turned out to resolve the iphone 6S dilemma In order to solve the previous generation iphone 6 plus mobile phone body bending performance is not high, the aluminum industry recommends that Apple use the aerospace industry with ultra-strength aluminum alloy 7075 sheet processing fuselage, brand new Iphone 6S and iphone 6S plus were all converted to aluminum alloy 7075 alloy plate manufactured by Alcoa Corporation. The expected good results were achieved. The bending resistance was greatly improved. The bending of the iphone 6S and the iPhone 6S plus disappeared after the drop and the deformation did not occur. Now.
Model 7075 Alloy Profile The 7075 alloy was developed by Alcoa for World War II aircraft. It was used in the manufacture of large bombers and fighter jets. It was finalized in 1944. The grade was 75S before July 1954. It was in the United States in July 1954. The Aluminum Association has registered and changed to a unified four-digit number 7075.
While studying the 75S alloy in the United States, Japan and the Soviet Union also studied such alloys at the same time. In 1945 and 1946, they successfully developed such aluminum alloys of practical value. They are Al-Zn-Mg-Cu alloys. Their strength is greater than that of Al-Cu-Mg series of hard aluminum, so it is called super-hard aluminum, until now it is still a type of deformable aluminum alloy with higher strength properties, and it is an aerospace aluminum alloy with more amount of use. One of them, with the 2024 type alloy is juxtaposed as two aerospace aluminum alloys.
For example, the front fuselage of the C919 aircraft, the passenger observation window frame, the middle fuselage stringer, the keel beam flange, the keel beam web, the floor transition beam, the mid-to-back fuselage stringer and the cargo door frame, and the nosepiece Edge bars, door frames, etc. are all made of different 7075 alloy materials. It can be said that without the support of the 7075 aluminum alloy, such high-value and lighter, more comfortable, and faster large passenger aircrafts cannot be produced.
7075 alloy in the mobile phone industry in the world of mobile phone body material, the new iphone is not using this super material smart models. Samsung's newly introduced slim Note5 and S6 edge+ models benefit from the use of the 7075 alloy. Because of the series of properties of the 7075 alloy, the stability of the two smart phone bodies has reached an unprecedented new height. Since then, there has been no change in bending, and no damage has occurred.
The 7075 alloy used by Samsung to manufacture the new Note5 and S6 edge+ models has a strong bending capacity, which is about three times higher than the previous body material.
Mobile phone and electronic products aluminum shell short board urgently needed to make up for a wide variety of electronic products, aluminum is also a wide variety of different styles, although a small amount of a single product, but the output of electronic products, millions, 10 million Some items, some even hundreds of millions, and very fast replacement, aluminum in the mobile phone body and electronic products are widely used in the manufacture of shells, and now can hardly find electronic products without aluminum.
Recently produced Apple, Samsung smartphones, part of Huawei's domestic mobile phone body are all aluminum plate CNC machining, in particular the use of 7075 alloy, while Samsung is using the aluminum company's 6013Alcoa power plate thick plate, There are several factories in China that have the equipment and technical strength to work hard to produce this alloy plate. However, it should not be taken lightly. For the Chinese aluminum processing industry, this is still a new alloy. There is no production experience, but there is production. 6061 alloy experience, because they belong to the Al-Mg-Si-Cu-Mn alloy.
In the current and future, the trend of light and thin phones is an irresistible trend, and stronger and better body materials are needed to support. In the future, there will be more domestic mobile phones using 7xxx alloy plate as the material of the fuselage, but now The plates used were produced by Alcoa. The import price was as high as 70,000 yuan/t, which was 3.9 times the price of the 3xxx alloy. Except that the 7075 alloy's production process was much more complicated than other alloys, foreign companies also Seeing that China can't currently produce such aluminum alloy thick plates for mobile phones, exotic goods can live.
Therefore, China must get rid of this predicament as soon as possible and make up for this short board. China's aluminum processing equipment is fully equipped to produce this type of aluminum sheet. Actually, as early as 1957, Harbin Aluminium Processing (code-named 0-plant, now The Northeast Light Alloy Co., Ltd., with the help of Soviet experts, successfully piloted aerospace-grade B95 (Soviet trademark, equivalent to 7075) alloy material, and I also participated in this project.
Of course, the processing technology of the 7xxx alloy mobile phone body alloy sheet, including CNC cutting and anodizing coloring, is much more difficult than the 6xxx series alloy sheet. Whether it can successfully solve these problems will become the promotion of the alloy sheet in domestic mobile phones. The key to the application.
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