Aluminum core material: High-purity aluminum or aluminum alloy is usually used as the aluminum core, and its electrical conductivity and mechanical properties are crucial to the quality of the product.<\/p>\n
Copper tape material: The copper tape should be high-purity oxygen-free copper, and copper with a lower oxygen content is usually selected to avoid oxidation and ensure good conductivity.<\/p>\n
2. Coating technical requirements<\/strong><\/p>\n Quality of the coating: The copper layer of the copper-clad aluminum wire should form a strong metallurgical bond with the aluminum core to avoid gaps or delamination between the copper layer and the aluminum core. The thickness of the copper layer should be uniform and meet the design requirements. Generally, there are different copper layer volume ratios such as 10%, 15%, and 20%.<\/p>\n Metallurgical bonding: The copper and aluminum core must be metallurgically bonded, not simply mechanically bonded. To ensure the atomic bonding between the copper layer and the aluminum core, high temperature cladding or cold extrusion technology is usually required to achieve this.<\/p>\n 3. Rolling process control<\/strong><\/p>\n Rolling equipment selection: Use appropriate rolling equipment, usually a multi-pass cold rolling mill, which is required to have good temperature and speed control performance and be able to provide sufficient rolling pressure.<\/p>\n Temperature control during rolling: Control the temperature of the metal during rolling to avoid the separation of the copper layer and the aluminum core due to excessively high temperature. Generally, the rolling temperature of copper clad aluminum wire should be controlled between room temperature and about 300\u00b0C.<\/p>\n Rolling speed and pressure: The rolling speed should be controlled within an appropriate range to avoid excessive rolling speed that may cause the copper layer to crack or become uneven. The rolling pressure should also be moderate to avoid excessive deformation of the copper-clad aluminum wire.<\/p>\n 4. Copper layer thickness and uniformity<\/strong><\/p>\n Copper layer thickness control: The thickness of the copper layer is crucial to the conductivity of the copper clad aluminum wire, so the thickness and uniformity of the copper layer need to be strictly controlled during the rolling process. Generally speaking, the different copper layer volume ratios (such as 10%, 15%, 20%) will be determined according to the application requirements of the final product.<\/p>\n Uniformity requirements: The thickness of the copper layer should be uniform without fluctuations, otherwise it will lead to unstable electrical properties of the product. During the rolling process, the settings of the rolling equipment need to be precisely adjusted to ensure that the copper layer is evenly coated on the aluminum core.<\/p>\n 5. Drawing process requirements<\/strong><\/p>\n Drawing speed and drawing ratio: Drawing process is the key step in making copper clad aluminum wire into flat wire. The drawing speed should be controlled within an appropriate range to avoid cracking or breaking of the copper layer. At the same time, the drawing ratio (i.e. the stretching ratio of the aluminum core and the copper layer) needs to be reasonably designed to ensure that the copper layer will not separate from the aluminum core during the drawing process.<\/p>\n Annealing treatment: In order to eliminate the internal stress during the drawing process, annealing treatment is usually required. The annealing process should be controlled at an appropriate temperature (about 300\u00b0C to 400\u00b0C) to ensure the ductility and softness of the copper clad aluminum wire.<\/p>\n![\"\"](\"https:\/\/www.ray-tron.com\/wp-content\/uploads\/2024\/12\/2024121016114667.jpg\")