The Mechanism By Which Annealing Improves The Properties Of Copper Terminal Blocks

During cold working, copper terminal block material will accumulate stress, which will increase hardness but decrease plasticity. Annealing, which involves heating and holding the material at a specific temperature (typically 200-300℃) followed by cooling, allows the crystal structure to rearrange and releases internal stress. This change increases the copper's plasticity and elongation, creating a favorable material foundation for subsequent crimping processes.

When the plasticity of copper distribution block is enhanced, the copper material can achieve more complete plastic deformation under the action of the crimping clamp. The contact area between the conductor and the terminal wall expands, resulting in a denser cold weld interface. This microscopic improvement directly translates into a reduction in contact resistance. According to industry test data, the contact resistance of copper terminal strip crimped material after annealing can usually be reduced to 40-60μΩ, which is a significant improvement compared to the value of unannealed material.