What are the factors that lead to abnormal fracture of spring charging needle?

Spring charging pins cover various spring thimbles and connectors, such as conductive pins, battery pins and antenna pins. This connector has the advantages of small size, high current, strong contact, beautiful appearance and stable performance, and is widely used in mobile phones, walkie-talkies, connecting wires, digital products, notebook computers, security products, medical devices, aerospace, communication equipment, consumer electronics, household appliances, toys and so on.

The stresses that the spring bears mainly include bending stress, changing stress, tension and compression stress and composite stress.

The main forms of spring failure are: cracking, deformation, relaxation and wear. The main analysis is cracking and deformation (relaxation).

1. Brittle cracking: spring cracking is mostly brittle cracking. Only when the working temperature is relatively high, some of them will have plastic cracking. Fatigue cracking, stress corrosion cracking and hydrogen brittle cracking are all called brittle cracking in engineering.

2. Fatigue cracking: the cracking of the spring under cyclic load.

3. Stress corrosion cracking: tensile stress and corrosive medium work together to cause tensile spring cracking.

4. Corrosion fatigue cracking: The spring cracks under the combined action of cyclic load and corrosive medium.

5. Hydrogen embrittlement, cadmium embrittlement and black embrittlement: brittle fracture caused by high impurity content in tension spring materials.

6. Wear: Wear is divided into abrasion, fatigue and corrosion, wear and cracking.

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