There is a door lock on every door of every home to protect the safety of the entire home. We all know that some thieves are very embarrassed and will use various means to unlock and steal, and how to prevent such things from happening better? The door lock is the key. So how do you buy indoor door locks?
How to choose indoor door locks:
1, the material of the door lock
There are many types of door locks, and according to the material classification, the copper lock is the best, followed by stainless steel, zinc alloy, aluminum, iron and so on. Although the stainless steel lock is only one level worse than the copper lock, it can't be used at the time of selection. The stainless steel door lock is recommended to choose 304 material. For the aluminum lock, it is recommended to buy space aluminum. Also, although there are iron locks on the market, it is recommended not to choose, because after a period of use, the plating layer on the surface of the iron lock will fall off, which will easily cause the lock to rust and have a short service life.
2, the lock cylinder lock
The quality of the lock cylinder of the door lock is directly related to the safety of the lock, so the quality of the lock cylinder must be paid attention to when selecting the lock. Generally speaking, the lock cylinder with less bullets is easier to open, and the lock core with more eyeballs is better in safety. According to the industry standards set by the state, the maximum opening ratio of the lock cylinder is 0.53%. . How to distinguish the lock cylinder eye? In fact, the eye is also known as the "tooth flower", generally less than 4 teeth of the lock core is not recommended to buy, not only that, the quality of the lock body should also pay attention to, try to choose more Insurance, such as double tongue or multi-tongue, if you must choose a single tongue, then you must also buy explosive, so it is more secure in terms of safety.
3, the appearance of the door lock
Whether the appearance of the door lock looks good or not will directly affect the appearance of the whole door, so the appearance of the door lock can not be ignored. Generally, you can pay attention to these two points when purchasing: 1 Is the surface of the lock body smooth and flat, and has no effect? To the flaw of beauty; 2 whether the key is smooth and smooth, not only affects the appearance, but also affects the use.
How to buy indoor door locks? This mainly depends on the quality of the lock body and the lock cylinder of the lock, especially the lock cylinder. If the quality of the lock cylinder is not enough, then the probability of being opened by other items will be higher and the safety will be reduced.
Editor in charge: Liu Changqi
Alnico Magnets are traditionally classified using numbers assigned by the Magnetic Materials Producers Association (MMPA), for example, Alnico 3 or Alnico 5.
Alnico magnets are produced by casting or sintering processes.[8] Anisotropic alnico magnets are oriented by heating above a critical temperature and cooling in the presence of a magnetic field. Both isotropic and anisotropic alnico require proper heat treatment to develop optimal magnetic properties-without it alnico's coercivity is about 10 Oe, comparable to technical iron, which is a soft magnetic material. After the heat treatment alnico becomes a composite material, named "precipitation material"-it consists of iron- and cobalt-rich[9] precipitates in rich-NiAl matrix.
Alnico's anisotropy is oriented along the desired magnetic axis by applying an external magnetic field to it during the precipitate particle nucleation, which occurs when cooling from 900 °C (1,650 °F) to 800 °C (1,470 °F), near the Curie point. Without an external field there are local anisotropies of different orientations due to spontaneous magnetization. The precipitate structure is a "barrier" against magnetization changes, as it prefers few magnetization states requiring much energy to get the material into any intermediate state. Also, a weak magnetic field shifts the magnetization of the matrix phase only and is reversible.
Alnico magnets are ideal for high temperature applications up to 550ºC
. Cast Alnico Magnet is very stable, has good corrosion resistance and a typical hardness of 50 Rockwell C. Once cast, the material is so hard that the only machining possible is grinding
. Cast Alnico Magnet represents the most versatile magnet material available. The range of properties can be accurately designed for specific applications by changes to element analysis and heat treatment.
Cast Alnico Magnet
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