Copper transformer strips are a critical material for manufacturing transformer windings, with core requirements including high conductivity, excellent mechanical properties, uniform dimensional accuracy, and superior surface quality. Their production process continuously evolves around the principles of "high purity, precision, and toughness.".

The core production process is as follows:

1. Melting and Casting: Cathode copper is melted in an induction furnace, possibly with micro-alloying or deoxidation treatment to ensure material purity and conductivity. The molten copper is then cast into large-volume copper flat ingots through vertical or horizontal continuous casting processes.

2. Hot rolling: The ingot is heated and then rolled on a continuous hot rolling mill to break the casting structure and form an initial strip blank. Modern processes aim for high temperature, rapid speed, and large reduction rate to enhance production efficiency and internal structure uniformity.

3. Cold Rolling: This is a critical step for achieving precise dimensions and superior performance. Through multi-pass, high-reduction cold rolling, the strip reaches the desired thickness (typically 0.1-3.0mm) and significantly enhances strength. High-precision rolling mills are essential for maintaining micron-level thickness tolerance control.

4. Annealing: After cold rolling, the material becomes harder and more brittle, requiring intermediate or final annealing to restore its plasticity and conductivity. Bright annealing is performed in a protective atmosphere to prevent oxidation, ensuring the strip surface remains bright, uniform, and free of oxidation.

5. Finishing and Slitting: After annealing, the strip undergoes tension-bending straightening to eliminate internal stress and ensure flat plate shape. It is then precisely slitted longitudinally according to the customer is specified width and coil weight, guaranteeing edge quality free of burrs.

The main technological advancements are reflected in:

Process Intensification and Efficiency: Extensive adoption of short-process technologies such as "upstream continuous casting—cold rolling" or "horizontal continuous casting—planetary rolling" significantly reduces energy consumption, streamlines procedures, and enhances yield and production efficiency.

High Precision and Intelligent Equipment: Equipped with systems such as AGC (Automatic Gauge Control), automatic plate shape control, and online surface inspection to ensure uniform and stable thickness, plate shape, and surface quality. Production data is fully traceable throughout the process.

Precision Control of Material Properties: By accurately matching alloy composition, work hardening rate, and recrystallization annealing processes, products with customized states (soft, semi-hard, hard) can be produced to balance multiple critical requirements such as conductivity, strength, bendability, and softening temperature resistance.

Green and Energy-Efficient Orientation: The production process places greater emphasis on energy conservation and environmental protection. The products themselves also aim for lower losses and better development to assist downstream transformers in achieving energy savings and reduced consumption.

In summary, the production of copper transformers is rapidly advancing from traditional mass manufacturing toward a direction characterized by high precision, customized performance, intelligent production, and green manufacturing, directly supporting the continuous improvement of power transformer energy efficiency ratings.