[China Aluminum] On September 8, Apple released a newer mobile phone, the iPhone 7, which is similar to the previous two generations of iPhones. This generation of "squeezed toothpaste" updates are still criticized as "the innovative Apple is dying." Apple has long been accustomed to it. However, Apple's new technology in these generations of products can not be regarded as "squeezing toothpaste", at least in the aluminum alloy shell process, Apple is still under labor. Today, we learned from the iteration of the iPhone about the progress of aluminum production processing technology.

Although in the previous generation of iPhone released in 2007, Apple had already adopted an anodized aluminum shell, and it was widely promoted in its notebook computer line Macbook, but it was said that Apple began to promote the anodized aluminum technology and even played it out. It's been time to talk about the iPhone 5 that was released in 2012.
iPhone5
In September 2012, Apple officially released the iPhone 5 in the post-Jobs era. The phone gave up Apple's use of two generations of stainless steel + glass shell, anodized aluminum + glass shell, and the proportion of anodized aluminum is quite high.
The more intuitive manifestation is that the new generation iPhone becomes lighter. With the increase of the screen and the enhancement of functions, the iPhone 5 has become lighter than the previous generation, and the sense of weight after it has been used no longer exists, and it becomes lighter and lighter. At the time, although the appearance of the new iPhone did not receive much recognition, there was still a lot of praise for the new anodized aluminum housing.
In the anodizing of apples, the dyeing method is mainly used. The aluminum alloy is first put into the acidic bath solution. By controlling the voltage, current density, bath composition and concentration, the aperture size can be 10 to 100 nm and the thickness can be several μm. The hole density ranges from 10 to the 9th to 10th, eleventh square/cm 2 porous membranes, and then metal (metal oxides) or adsorbing dyes are electrodeposited in these pores to seal the pores and obtain corrosion resistance. Wear-resistant, colorful surface protection and decorative layers.
In addition, Apple also pioneered the application of unibody integrated molding technology on mobile phones. Unibody technology is a one-piece body technology, a kind of mechanical processing technology that extrudes aluminum alloy into plates and then integrates them with CNC machine tools. Unibody makes the phone directly into two parts: the screen and the shell.
One more thing to say is the three-part back style. The upper and lower parts are ceramic glass. This is in line with Apple's pursuit of a minimalist style, while Unibody can make the machine thinner, but it also puts a greater demand on the internal structure of the fuselage, and signal problems are even more difficult to handle. However, Apple did it. All the technology made the iPhone 5 even if it wasn't a good mobile phone at the time, but it must be a more sophisticated mobile phone.
However, due to the immaturity of the technology, iPhone5 formed a large-scale paint dropout incident after its listing. Due to the immaturity of the anodizing technology in the field of mobile phones at the time, the colored layer was not firm enough to allow some small external force to scrape the colored layer of the outer shell.
Unfortunately, at the time, Apple was unable to do anything about it. Moreover, at the time, a large number of finished products were ready to go. Therefore, no effective solution was implemented. Moreover, due to the lack of colorants in anodizing technology, so there are not many colors that can be presented. This generation is still only black and white.
iPhone5S
After the iPhone 5's paint-out problem caused an uproar, Apple dived to concentrate on developing a more stable anodized coating to prevent recurrence of the paint-out event. After a year of "cultivation," the iPhone5S is available on schedule. In addition to the improvement of internal configuration, the last generation of paint defects that have been criticized has also been improved, and it has also brought a new color - gold.
Apple's iPhone 5S shell coloring process was added to the issue of paint removal. The thickness of the oxidized coating was increased by multiple anodizing, and it was determined that the thickness of the anodic oxide coating of the iPhone 5S reached 12 μm, which is a lot thicker than that of the iPhone 5 . At the time of listing, there were people who used a knife to scrape the iPhone 5S. The coating was also very firm and did not fade.
At the same time, the use of new colorants also gives the iPhone 5S a new color of gold. This is another example of Apple's use of orders to force suppliers to upgrade their technology. Apple often forces large orders to force suppliers to upgrade their production technology, or even purchase their own equipment for suppliers. This business model is quite similar in the world. rare. While a large number of iPhones are being produced, the anodized aluminum oxide technology for mobile phones is also rapidly developing and the cost is rapidly declining. Other manufacturers are also taking this trend and mass production of mobile phones with anodized aluminum casing, and then Apple has once again created a trend. Repeat this cycle. This also makes Apple always lead the industry trend.
iPhone6
The use of anodized alumina on two generations of models has made Apple taste the sweetness and has made it more bold. The newer iPhone 6 released in September 2014 simply canceled the two glasses on the back of the aircraft and completely used anodized aluminum.
This generation of iPhone gave up the angular design, and returned to the 3GS era round design, which is a new challenge for the anodized aluminum shell. It turns out that Apple made a very positive answer.
iPhone6 ​​compared to the two predecessors, has a qualitative leap in the feel, completely without the feeling of the first two generations of cut hands, at the same time, the use of sandblasting anodized aluminum shell and the combination of a rounded body can be described as a perfect match. Even in the case of a substantial increase in the size of the body, iPhone6 ​​started with a sense of weight not only did not increase but there is a reduction, even if the appearance of controversy, but light from the start feel, iPhone6 ​​was leading all opponents at that time .
However, just as Apple secretly delighted in the resolution of these two issues, a new problem has emerged again. Many people found that the iPhone 6 lacked strength and could easily be “sit-in-the-bend.” This is due to the lack of strength of the iPhone 6000's 6000 series aluminum alloy, which can only be guaranteed to not deform under the force of 30 pounds. While the weight of a person is much higher than this number, it is not uncommon for a person to sit in a bend. This is an unavoidable flaw behind the iPhone 6's hot sales in the world, and it has also allowed Apple to focus on improving methods for the rest of the year.
iPhone6S
In one year of research and development, in September 2015, Apple delivered the answer sheet. In addition to the use of 3DTouch, iPhone 6S seems to be lackluster, even the appearance has not changed significantly. Apple has also been criticized by outsiders for "squeezing toothpaste." But in fact, Apple has also made a lot of effort in the invisible places.
This time the iPhone6S brought a new color rose gold, which also indicates that the anodized coloring technology has developed to a more mature stage and can create more colors. The previous generation was criticized as "taking a bend in the door," and Apple made a change.
iPhone6S gave up using the 6000 series aluminum alloy this time, instead of using 7000 series aluminum alloy. 7000 aluminum alloy can also be called aluminum magnesium, zinc copper aluminum alloy or super hard aluminum, according to the different content, the label also varies.
The main use of the iPhone6S is the 7075 alloy. This aluminum material is mainly used in the aerospace and military industries. In recent years, with the promotion of aerospace technology in the civilian field, the material has started to have consumer electronics products with higher design requirements. Appeared in. 7000 aluminum can be regarded as a kind of high strength aluminum alloy for industrial use, and its strength even reaches about 2/3 of what we call rebar (industrial A3 steel). This performance is also it One of the most popular reasons.
However, 7000 aluminum alloys still have their own weaknesses. Its high strength will increase the difficulty of CNC machining, resulting in increased manufacturing costs. In addition, the surface adhesion of the 7000 aluminum alloy is slightly lower than that of the 6000 aluminum alloy, and there is a risk of falling paint.
Fortunately, Apple already has experience, thickening the antioxidant layer to solve this problem, while the 7000 aluminum alloy corrosion resistance will be worse, the antioxidant layer can be added to protect the iPhone from the oxidizing liquid such as sweat The erosion made the new iPhone have a consistent appearance and texture.
iPhone7
iPhone7 has been officially released on September 8, 2016. In addition to retaining the original four colors, the new machine also added a new color of piano black. There are a lot of black metal mobile phones on the market, anodized aluminum mobile phones are numerous, but to combine the two, plus the mirror polishing process, iPhone7 is on the front.
Although Piano Black itself is still black, the use of a polishing process can produce a mirror-like effect on the surface, allowing it to preserve the texture of the metal, but at the same time it can reveal a glassy, ​​ceramic-like visual sense. Apple really took an anodized aluminum technology to play this time.
The piano black craft is mainly like this: First the metal body CNC processes, first carries on the grinding polishing processing, achieves the mirror surface to be as smooth. Anodized coloring is then performed using an extremely saturated black paint. After the anodization, it was polished again.
According to Apple's official website, this process has gone through nine precision processes. Apple's persistence in the appearance of innovation is evident, but also let the sandblasting anodizing process regenerate a new "play" in today's highly popular.
It is foreseeable that there will be many mobile phone manufacturers choosing to follow after the iPhone 7, and the mobile phone of this kind of technology will soon be flooded in the market. This is where Apple's "magic power" lies.
Technology based on shell change
Today, it has evolved into a "technology-based color change." Nothing changes in the design does not matter, the introduction of a new color still sell as new products. Last year, iPhone7's black became the more popular color of the season, and this year Apple seems to be launching a new Chinese red color scheme. From the current online renderings, we can see that the black and red color of the iPhone7 is just a burst of value. Today's microblogging broke a suspected release of Apple's new internal policy, which said the iPhone7 and iPadPro will have new. iPhone7 will launch a customized version of China Red.
to sum up
From the iterative process of the iPhone in recent years, we can know the leap forward in the production and processing technology of aluminum alloy mobile phone housings, and also understand that Apple has forced manufacturers to upgrade their production technologies with large orders, and even provide manufacturers with equipment for this model. In fact it is quite successful.
It turns out that the pressure from customers is more useful than any help and funding method. It is believed that as customers like Apple and aluminum alloy manufacturers continue to cultivate in this field and innovate, aluminum alloys will burst into endless possibilities.

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