English
Don’t underestimate the small Round Bar Magnets. They are actually everywhere in our lives and work - from household refrigerator magnets to industrial accessories for high-end equipment, and even mobile phones and notebooks. Today we will talk about some unknown little-known facts about these magnets and their magic uses in various industries.
1. The size of the magnetic force affects the application scenario
The charm of round bar magnets is first reflected in their magnetic force. This magnetic force is not chosen casually, but must be adapted to local conditions. For example, when Apple designed the iPad protective case, in order to facilitate use, it chose a magnet with weaker magnetic force, which can easily "absorb" the protective case without being difficult to remove. According to TechInsights' disassembly analysis, the magnetic force used in the iPad's magnetic suction protective case is between 200-300 Gauss, which is very suitable for such lightweight accessories.
In industrial situations, the magnetic force is much stronger. Take some precision equipment in the workshop as an example, stronger magnets are needed to ensure the stability and accuracy of equipment parts. Therefore, when choosing magnets, you should choose according to the actual situation. The stronger the better, the better.
2. The coating material is very important - invisible durability
The coating material of the magnet is sometimes much more important than you think. Especially in a humid or corrosive gas environment, a bare magnet is easily oxidized and rusted, which affects the service life. For example, the US Navy uses nickel-plated NdFeB magnets in ship propeller systems to prevent seawater corrosion and extend the service life of the equipment. Studies have shown that the corrosion resistance time of nickel-plated NdFeB magnets in salt spray tests is more than 30% higher than that of ordinary magnets. It can be said that small details have a big impact.
3. The favorite of DIY enthusiasts: wonderful use in creative projects
You may not have thought that round bar magnets are particularly popular in the DIY circle. There are many DIY masters on Pinterest who use magnets to make floating bookshelves, magnetic wall decorations, and even storage cabinets, which are convenient and personalized. A neodymium magnet with a diameter of 10 mm can withstand a weight of 500 grams. A small magnet can firmly "hang" a book or a few small tools, making it a perfect storage artifact.
For friends who like to renovate their homes by themselves, this type of small magnet is an indispensable helper. It is inexpensive, easy to use, and creative.
4. Small magnets are also "dangerous"
Although magnets are small, friends with children or pets at home should be more careful. In 2018, the U.S. Consumer Safety Commission (CPSC) issued a recall notice to the toy company Zen Magnets because children accidentally swallowed these small magnets, causing serious damage to the intestines. According to CPSC data, in 2016 alone, there were more than 1,700 cases of emergency department visits in the United States due to accidental swallowing of small magnets, of which more than 80% were children.
Therefore, if there are children at home, it is recommended to place small magnets out of their reach. Pay special attention to small magnets in toys or DIY tools, and don't let children swallow them by mistake.
5. Green Mission: Environmental Protection and Recycling of Magnets
Few people may notice the environmental protection issues of magnets. In fact, the recycling of magnets is not simple, because most magnets are made of rare earth metals, which have high recycling costs and require special technical processing. The Nordic Rare Earth Company (NREE) in Sweden currently recycles magnets from waste electrical appliances to produce magnets for new energy motors. This practice not only saves resources, but also reduces the demand for rare earth metal mining, which is of great environmental significance.
According to the European Environment Agency, the rare earth magnets recycled each year can reduce the demand for rare earth mining by 30%. Perhaps in the near future, recycled magnets will become a new trend in the environmental protection industry.
6. High temperature environment is the mastermind behind the "demagnetization" of magnets
NdFeB magnets are one of the most widely used powerful magnets, but they are particularly prone to demagnetization in high temperature environments, which brings difficulties to many high temperature industry equipment. When Tesla designed the motor of Model 3, it had to use a cooling system to maintain the magnetic force of the magnets and avoid demagnetization.
Research data shows that NdFeB magnets will gradually demagnetize above 80°C, while some high-temperature resistant Alnico magnets will basically not have problems below 300°C. Therefore, temperature adaptability is also a key factor that must be considered when selecting magnets.
7. Tips for quality identification: The stronger the magnet, the better
Many people think that the stronger the magnet, the better, but this is actually a misunderstanding. For example, the magnets used by Volkswagen in Germany on automated assembly lines have a magnetic force between 350-450 Gauss to ensure the precise positioning of parts. Excessive magnetic force may cause parts to be adsorbed too tightly, which is not conducive to the smooth progress of the automated process.
Therefore, when purchasing magnets, first consider the specific needs and determine the appropriate magnetic force range, rather than simply pursuing strong magnetic force. Many friends ignored this point when purchasing, and found that they were not suitable after buying them.
Summary
Although round bar magnets are small, they play a big role in various industries and life scenarios. From the requirements of different magnetic forces to the effects of high temperatures, from the durability of the coating material to the issue of environmental recycling, these details determine the service life and application scenarios of the magnet. It is precisely because of these characteristics that the application field of magnets is so wide - a small magnet in hand brings unexpected convenience and possibilities to life and work. Next time you encounter a magnet, you might as well pay more attention to these details, and maybe you can find more of its magical uses.