The spring is often used in the handle. The spring in the handle is mainly used to reset the rocker, balance the rocker, and provide kinetic energy for the lock rocker or position feel, etc., so the spring is an extremely important part in the handle. Once there is a problem with the spring , which will basically directly lead to the reduction of the corresponding functionality of the handle or even the inability to use it; the two common types of handles are compression springs and torsion springs, as shown in the following figure:
Generally, more compression springs are used in use, because the service life of compression springs in the same working environment is significantly higher than that of torsion springs. Of course, some products use torsion springs because the characteristics of torsion springs are around their own axis. The heart is twisted, so such as a compact handle, a handle with a large swing angle often uses a torsion spring.
So let's talk about the main factors that cause the spring to fail.
1. Defects of the material itself, if the inclusions in the spring material are too large or the size is too large and concentrated, it is prone to premature fatigue failure; in this case, the processor's feeding process must be strictly controlled, Purchasing manufacturers must be fixed, and materials cannot be changed at will without permission;
2. The design is unreasonable. If the wire diameter, outer diameter, inner diameter, pitch and other parameters of the spring are unreasonably selected during the design, the service life of the spring will be affected by wear, excessive stretching, extrusion, etc., according to the expected operation at the time of design. Force and forming angle, determine the cross-sectional size of the lower spring, try to use the size specified in the national standard when determining the cross-sectional size, and avoid using non-standard series of specification materials.
3. Defects caused by unreasonable processing technology. After the spring is formed, the low temperature stress relief treatment is generally carried out at 220℃-330℃. If the effective annealing treatment is not obtained during the process, the spring will fail due to the stress concentration generated during the processing. In addition, sometimes in order to use in a highly corrosive environment, the spring needs to be protected by coating, but if there is no effective dehydrogenation treatment during the electroplating process, the spring will also fail due to hydrogen embrittlement. For preventive measures, it is necessary to strictly control the processing technology; if there are no special requirements, try not to use surface electroplating for protection. If electroplating requirements are indeed required, the dehydrogenation treatment must be specified in the technical requirements.
