In the 1980s, with the development of the world's non-ferrous metal smelting casting technology, the country have introduced a number of bright copper rod continuous casting and rolling production line.
At present, most of the production lines are still operating normally except for a small number of production lines due to poor management and operation. The introduction of continuous casting and rolling production technology has promoted the development and technological innovation of copper wire rod production in China. However, due to historical limitations, the production capacity of these production lines is generally low. In addition, while introducing these equipments, there is no supporting process detection technology, resulting in fluctuations in performance and quality of the produced copper rods. In general, the specifications of these production line slabs are generally small, the total deformation rate is small, resulting in insufficient production capacity, energy consumption can not be reduced, and product quality is also poor.
In recent years, these production lines have been improved and improved to varying degrees through asset restructuring and opportunities for relocation. Since the 1990s, China's wire and cable industry has developed rapidly, and the demand for copper wire rods has increased dramatically. According to the statistics of China Nonferrous Metals Industry Information Center, in 1999, the actual output of China's round copper rods was only 400,000 tons, while the consumption was about 650,000 tons. Most of the gaps were imported from abroad. In addition, with the rapid development of electromagnetic wires, communication cables and other special-purpose wires and cables, the emergence of multi-wire multi-mode high-speed wire drawing machines has become increasingly demanding for copper rods. The copper rods produced by small-sized slabs are increasingly unable to meet the requirements. So at the end of the 20th century, China has introduced or relocated several continuous casting and rolling production lines.
These production lines are equipped with high level of equipment, large production scale, low energy consumption, continuous process, high degree of computer monitoring, and excellent product quality. They represent the world's advanced "SCR" and "Contirod" bright copper rod production technology. Simultaneously introduced SpectroLabS large-scale multi-channel spectrum analyzer, online eddy current flaw detector and other equipment, to provide a more rapid and accurate detection means to ensure the production of high-quality low-oxygen bright copper rod. They have won the market relying on advanced process equipment, high production efficiency, low energy consumption and excellent product quality, and have achieved remarkable economic benefits. Their products not only meet the domestic market, but also are exported to all over the world.
At present, the total processing capacity of China's copper rods has been 2.8 million to 3 million tons, which is about three times the demand. For existing production lines, improving equipment utilization, improving product quality, and reducing production costs are fundamental guarantees for achieving a favorable position in the competition.
Domestic continuous casting and rolling production equipment Since the first copper wire rod continuous casting and rolling production line designed and manufactured by China in the 1980s, there have been more than 10 domestic copper continuous casting joints with an annual output of tens of thousands of tons. The rolling production line was put on the market. These production line equipment investment is low, and production costs are greatly reduced. However, due to the weak development capability and technical design of the industry, the application of high-tech and online testing methods is also lacking. The inherent precision and external quality of equipment manufacturing are still quite different from those of advanced countries. Specifically embodied in the following aspects: [next ]
1. The manufacture and control of the shaft furnace is still immature. The production line is equipped with multiple reverberatory furnaces. The cost and oxygen content of each furnace are not uniform. Even in the same heat, it is difficult to ensure uniform composition and oxygen content. Continuous casting and rolling process The characteristics of stable quality, uniform performance and energy saving are difficult to fully reflect.
2. Lack of equipment and means for online quality inspection and control.
3. Computer process monitoring technology is still not perfect.
4. Lack of complete auxiliary equipment, coupled with low manufacturing precision and poor reliability.
5, the single machine capacity is low, the specification benefits are not reflected.
Compared with the introduction of production lines, the quality of domestically produced production lines is generally low, mainly for the low-end market. Faced with the continuous improvement of the quality requirements of copper rods for the subsequent processing of copper rods, and the continuous improvement of foreign technology, domestic counterparts can only grasp the development and catch up in order to gain an advantage in the future competition.
The development of continuous casting and rolling bright copper rods has become more and more demanding on the quality of copper wires. In order to obtain high-quality bright copper rods, domestic and foreign equipment manufacturers and copper rod manufacturers are producing. A lot of work has been done on the process, installation level, quality inspection and management, such as adding automation devices, improving the monitoring of the process, improving equipment and using computer management to improve quality and reduce costs.
In addition, the SCR production line also adopts the following new technology: the double fork feeding system is adopted, which does not impact the furnace wall and the cloth is uniform, further improving the furnace thermal efficiency (reducing the furnace energy consumption by 10%); the caster steel belt adopts the two-way tensioning device to improve Steel belt life. The Contirod production line liquid level automatic control adopts the more advanced EMLI electromagnetic sensor, which is more accurate and reliable than the traditional optical sensor. The rolling mill is divided into three groups: coarse, medium and fine. The photoelectric control looper is set between medium and perfect rolling to realize tension-free rolling. A cooling pipe is arranged between the middle rolling and the finishing rolling to reduce the finishing rolling temperature and improve the drawing processing performance.
The market is developing, with the increase of market demand, the improvement of the quality requirements of copper rods, and the development trend of large-scale and economical production of the global wire and cable industry, the application of continuous casting and rolling method in the production of copper rods in China will More and more wide.

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