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What is the role of contact shrapnel in the connector
The contact shrapnel has the following 3 functions on the connector:
1. Provide a telecommunications path between components
2. Generate pressure to form and maintain the contact surface of the contact shrapnel
3. The first function of forming a stable contact, as long as the commonly used copper or copper alloy materials are used, satisfactory results can be easily achieved.
Although the conductivity of copper alloys is not very low, only 10% to 30% of the conductivity of copper, this conductivity is sufficient for most connectors. However, the electrical conductivity of the material does play an increasingly important role in connectors used for high current or energy distribution, because in this type of connector, the required temperature rise caused by heat and micro voltage drop is more demanding. Low impedance. The other two functions are much more complicated and involve the interaction between material properties and design parameters. There are two basic types of contact shrapnel: socket shrapnel, which is usually elastic; plug shrapnel, which is usually rigid, which makes the socket shrapnel elastically deform, thereby generating a holding force. In fact, all of these designs show a special connection with a contact shrapnel called 25 square, which is square in shape with a side length of 0.025 inches.
We must comprehensively consider the various properties of materials and strive to achieve a balance. For a detachable contact interface, the main function of the elasticity of the contact spring is to provide a butting force between the two mating surfaces. Material properties refer to Young's modulus and yield limit. These properties severely affect the elastic deflection performance and elastic deflection amount. The yield limit is also important because it reduces the insertion force. However, the elastic strength must correspond to the manufacturing and crimping properties. For example, the mechanical strength (measured by the yield limit) used to provide an elastic butting force on the butting surface is opposed to the forming performance and forging performance.