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Analysis of the reasons for the fracture of the mold nitrogen spring

Time:2021-06-25    Edit by TengFei

The mold nitrogen spring is an elastic component with high-pressure nitrogen as the working medium. It requires customers to install and use it correctly to ensure its safety, reliability and expected use effect, and extend its service life. Nitrogen gas springs require considerable stability and reliability both in operation and installation. The mold will break during use. What is the cause? Linkage molds are analyzed and summarized based on experience. The main reasons for mold breaks are as follows.


1. The mold core shaft is too small or the spring is used horizontally, and the spring and the core shaft are worn and broken;

2. When the mandrel is too small, the assembly surface is not flat, and the parallelism of the positioning surfaces at both ends is not good, the spring will be compressed and twisted, and high pressure will be locally generated and broken;

3. The mandrel is too short and the end is not chamfered, which will cause friction and wear between the spring and the mandrel and break;

4. The use of foreign matter between the spring coil and the coil reduces the actual effective number of coils, thereby generating high stress and causing it to break;

5. The spring is used in series to make it bend and exceed the length of the mandrel or counterbore, or the weaker load will break due to the small difference in the spring itself;

6. The use of more than a large amount of compression will generate high-efficiency stress and cause the spring to break;

7. The spring material is not uniform, or the impurity content exceeds the standard, resulting in stress concentration and fracture;

8. The spring is overburned, rusted, hardened, and over-extended will reduce its tensile and compressive strength and cause fracture.