CHS spring use method and precautions
CHS Spring constantly improves the cross-sectional dimensions and design parameters of rectangular springs to improve the durability of rectangular springs. For your safer use and avoiding the troubles caused by improper use, please pay attention to the following.
1, the use of no spring guide shaft
In the absence of a spring guide pin, the spring is extremely prone to bending and deformation, eventually causing the spring to break and causing great damage and damage to the device.
* Generally, it is desirable to use an inner diameter all-way guide.
2. The relationship between the inner diameter of the spring and the guide shaft
It is recommended that the inner diameter of the spring be 1.0 mm larger than the guide shaft. If the clearance is too large, the spring will bend. If the clearance is too small, the inner diameter of the spring will be easily worn, causing the spring to break up early.
3, the relationship between the outer diameter of the spring and the counterbore
It is recommended that the outer diameter of the spring be 1.5 mm smaller than the counterbore. Since the outer diameter of the spring expands after compression, the gap is too small, which causes the spring to be restrained, causing the spring to break up early.
4. When the guide shaft and countersink depth are small
It is recommended to set the length of the guide shaft to 1/2 or more of the initial setting length. If the guide shaft is too small, it is easy for the spring to collide with the front end of the guide shaft when bending, which causes the spring to break early. It is recommended that the front end of the guide shaft be chamfered.
5, exceed the standard use
When the standard service life is exceeded, the cross section will generate stresses beyond the safe range, and uncertain fractures often occur. Therefore, please use it according to the standard usage of the catalog. When the maximum compression amount is exceeded, the load line diagram rises rapidly, and stresses exceeding the safe range are generated, which is likely to cause early breakage and spring deformation.
6, no preloading use
If the spring is not used for preloading, the spring tends to move up and down to generate an impact force, which may cause damage or deformation of the spring. Please use it before pre-pressing. The amount of preload is determined according to the free length of the spring to ensure that the spring can operate stably.
7. Use under scrap and foreign matter
Be sure to keep the scraps and foreign objects from mixing when the spring is running. Mixed waste and foreign matter not only reduce the running space of the spring. Due to the inertia of the press, it is very easy to subject the cross section of the spring Wire to abnormal shearing forces, causing the spring to break up early.
8. Use when the parallelism of the mounting surface is poor.
If the parallelism of the surface is poor, the spring will be tilted, causing high stress locally, causing early breakage. Please improve the parallelism of the mounting surface.
9, the spring is used in series
Since it is a series connection, the load of each spring is increased due to the different load of each spring, resulting in deformation or even breakage of the spring.
10, the use of spring sleeves
When the spring sleeve is used, it is easy to inset the inner and outer springs, causing collision, squeezing, and early damage.
Operating temperature
The catalogue shows the service life and maximum compression of the spring at normal temperature (25 ° C). Even if it is used beyond normal temperature, the performance will not drop significantly at 80 °C according to the normal use method. root
Depending on the conditions of use, the durability of the spring will vary greatly, and reduced durability will shorten the life of the spring, reduce the spring stiffness, and reduce the free length of the spring.
※Main use conditions that lead to increased temperature and reduced durability:
â— Large initial compression and long state retention time
â— Use speed (repetition speed) is fast
â— Large stroke amount (the difference between the initial compression amount and the maximum compression amount is large)
In the case of the above, perform maintenance at a service life lower than that indicated in this catalog.
* The heat resistance temperature of the spring is lower than the heat resistance temperature of the wire (120 ° C for round wire and 220 ° C for rectangular wire).
Use compression
Be sure to use it within the maximum compression range. The service life will vary depending on the actual compression. Exceeding the maximum compression will not only reduce the service life or spring stiffness, but also cause breakage and damage.
Injury mold.
In addition, the press-fit length is a standard value. Avoid using it near the press-fit length. If necessary, reset the load or free length.
When used in a pressed state, the free length or spring stiffness will be reduced and the service life will be shortened.
The stamping die uses more springs at the discharge screw, the floating material pin, the materializing rod, etc., and the designer needs to consider the installation space, load and service life of these springs.
1 The installation space is dominant, and the most suitable load specification is selected.
2 Based on the design load, find the specifications that are most suitable for the installation space.
Click for more information:
ISO standard mold spring JIS standard high compression mold spring JIS standard heavy load mold spring round wire mold spring non-standard custom spring (corrosion resistant spring)
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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