In the early stages of bar production, the open-train mill was the primary equipment. However, its limitations and inefficiencies soon became apparent.
In order to reach more high yield with lower cost, factories optimize rolling process and improve performance of equipment and process. In result, the semi-continuous rolling mill replaces the open-train mill, and now the continuous rolling mill is widely used to produce bar& wire rod line and greatly enhance production yield.
To achieve higher output at lower costs, factories began optimizing the rolling process and upgrading equipment and technology. As a result, the semi-continuous rolling mill replaced the open-train mill. Today, continuous rolling mills are widely adopted for bar and wire rod production, significantly enhancing production yield.
The continuous rolling process offers several clear advantages over other methods:
- Higher production efficiency.
- Energy savings: The continuous rolling line can save up to 30% more energy than the semi-continuous process due to billet hot delivery and hot charging.
- Improved automation: Automation levels are significantly enhanced.
- Better surface quality: High-pressure water descaling is installed after the furnace to improve the final product’s surface finish.
- No-twist rolling: Mill stands are arranged alternately in horizontal and vertical positions, enabling a fully no-twist rolling process.
- Efficient adjustment: Short-stress rolling mills are used, allowing for symmetric roller gap adjustments and quick stand replacement with minimal on-line adjustments.
- Flexible drive system: Mill drives use either DC motors or AC variable speed drives, enabling stepless speed regulation throughout the rolling line.
- Higher yield: The rebar production line incorporates a slitting process to further increase output.
