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目前,国内中小型高刚度轧机主要有两大类:短应力线轧机和预应力轧机,其特点是缩短应力线,提高轧机刚度,用滚动轴承代替胶木瓦轴承,缩短换辊时间等。老式轧机的产品精度只能达到新国际标准的三级(±0.45mm),而高刚度轧机的产品精度可达新国际标准的一级(±0.1～0.2mm)到二级(±0.3～0.4mm)。为了提高产品精度,北京科技大学的钟廷珍教授提出了“三不变”的原则,即工艺布置不变,轧机主传动不变,轧机基础不变。只是将最后1～3机架换上高刚度轧机的新观点。几年来,我国的中小型轧钢厂的改造实践证明了这种观点是正确的。
At present, there are mainly two types of medium and small-sized high rigidity rolling mills in the country: short-stress line rolling mill and pre-stress rolling mill, which are characterized by shortening the stress line, increasing the rigidity of the rolling mill, replacing the plastic shingle bearing with rolling bearings and shortening the roll changing time. The precision of the products of the old rolling mill can only reach the third level (± 0.45mm) of the new international standard, and the precision of the products of the high rigidity rolling mill can reach the level of the new international standard (± 0.1 ~ 0.2mm) to the second level (± 0.3 ~ 0.4 mm). In order to improve product accuracy, Professor Zhong Tingzhen from Beijing University of Science and Technology proposed the principle of “three invariance”, that is, the process layout remained unchanged, the main drive of the mill remained unchanged, and the foundation of the mill remained unchanged. Just the last 1 to 3 rack replaced by high stiffness mill new point of view. Over the past few years, the reform practice of China’s small and medium-sized rolling mills has proved that this view is correct.