一、问题的提出随着现代工业的飞速发展,人们对有色金属材料的需求水平越来越高。例如种类繁多的机械设备、电器装置、通讯手段等需要的单根无缝铝管长度往往达到数千米或上万米,重量达数百公斤甚至数吨,且尺寸精度要求甚高。要全面达到这些要求,用常规的 First, the question raised With the rapid development of modern industry, people’s demand for non-ferrous metal materials is getting higher and higher. For example, a wide range of mechanical equipment, electrical installations, means of communication such as the need for a single seamless aluminum tubes often reach the length of several kilometers or tens of thousands of meters, weighing hundreds of kilograms or even tons, and dimensional accuracy requirements. To fully meet these requirements, use conventional