Author: Kevin
Link: /question/67483519/answer/800707783
Source: Zhihu
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To add to some of the praises about the styling, in fact you may not even be able to copy the styling well... Apple puts more effort into the subtle parts than we see.
The following content is excerpted from related articles by a professional answerer on ID?
@Hi-iD
The process of Apple’s “seamless” design, for those who are interested Friends can read the original article.
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Apple Pencil? If you want to identify it accurately, then it is composed of four sections, but because the middle pen body is long enough, it is one piece There is no segmentation, so it seems that the Apple Pencil has a strong sense of unity, which can be compared with any other stylus currently available.
The Apple Pencil body is made of plastic, a cylindrical sleeve with a tapered tip. It must be hollow because the internal components of the touch pen need to be installed. If you understand the injection molding process, you will find that it is almost impossible to mold such a plastic part. Such a slender hollow cylinder has a tapered tip shape at one end. If the draft angle is calculated, the final shape will be Become incredible. Assume that the inner cavity only uses a 1° draft angle, and the Apple Pencil cylinder is almost 170 mm long and about 9.0 mm in diameter. Assume that the wall thickness is 1.0 mm (so the inner cavity diameter is 7.0 mm). Then if one end meets the current requirements of the Apple Pencil In terms of size, the wall thickness at the other end reaches 4.0 mm, while the diameter of the inner cavity is only 1.0 mm. A 4-fold variation in wall thickness makes this plastic cylindrical tube impossible to produce.
Apple uses a 0° draft process. The first-generation iPod Shuffle introduced above is also close to 0° draft, but it uses a secondary injection molding method, and on the Apple Pencil Because it is a cylinder, it cannot be achieved by methods such as secondary injection molding. It requires a new core-pulling method to pull out the mold core so that the inner cavity of the cylinder is drafted at 0°, that is, the diameter is consistent everywhere at the head and tail. The internal structure of Apple Pencil can be referred to iFixit’s disassembly. iFixit used a grinding wheel to saw it apart.
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The reason why there is a draft angle in the cavity is to facilitate the extraction of the mold core. If the draft angle is too small, the mold core cannot be extracted. , or it can be forced out, but it will strain the inner surface of the product, or damage the entire product, because the mold is usually made of high-hardness steel. In order to ensure the dimensional accuracy of the product produced, the mold needs to be fixed in size, and It is less disturbed by thermal expansion and contraction. To form the 0° draft of the inner cavity of the Apple Pencil, a flexible mold core is used, which is composed of two parts, a flexible sleeve with an opening, and an inner core, relying on this flexible sleeve to have certain properties under certain conditions. Elastic deformation allows it to be withdrawn from the cylindrical cavity of the Apple Pencil.
FIG. 3 above is the flexible metal sleeve, and FIG. 5 is the inner core that will be installed into the sleeve. The sleeve has a polished outer surface and is made of low-friction metal, making it easy to slide out of the plastic inner wall. A whole groove is opened on the sleeve so that the sleeve can have a certain degree of elasticity. The matching inner core has a The raised key, sleeve and inner core make up the mold core. The injection molding process is to first install the sleeve on the inner core, then close the outer mold, complete the injection molding, and pull out the injection molded plastic part and sleeve from the inner core. At this time, the sleeve is on the inner wall of the plastic part, because The sleeve has a certain degree of flexibility, and when it shrinks inside, it can be pulled out from the inner wall of the plastic part. FIG.
9 is the injection molding process after the mold is closed, while FIG. 12 is the elastic deformation of the flexible metal sleeve on the inner wall of the plastic part (the example in the picture is a triangular prism). For details, please refer to Apple's patent - US 20150367545.
As mentioned above, Apple has done a lot in many subtle ways, which is why we feel like ‘I can’t say what’s good about it, but it just feels good’ when we use Apple products. Because it is powerful, it is simple. It is not an easy thing to do.