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前言现代小型棒材的生产,将以连铸—连轧取代旧式的模铸—开坯生产。为提高产品的内在质量、表面质量、定尺率等,坯料的断面已经增大,坯料长度、单重不断增长,有的成品长度已达数百米,甚至千米以上。轧制速度已达25m/s。因此,用传统技术建造一座满足上述成品轧制长度和速度要求的冷床,将使冷床太长,厂房太长,冷床的传动等技术,设备问题无法解决,建设投资也大。如我国S厂成品最高线速度为16m/s,飞剪分段长度在100m以下,冷床长120m,冷床重达700余吨,而且有时还满足不了成品卸上冷床时,速度制动所需滑动距离的要求。而我国A厂新建成投产的φ260mm半连续小型棒材轧机,使用坯料为120mm方、长6m的连铸坯,生产φ12～25mm圆钢、螺纹钢,其中φ12mm圆(螺纹)钢的终轧速度达17m/s,却仅用66m长的冷床即满足了生产要求。这是由于
Preface The production of modern small bar will be continuous casting - continuous rolling to replace the old mold - billet production. In order to improve the inherent quality of products, surface quality, scale and so on, the billet cross section has been increased, the billet length, single weight continues to grow, and some finished product length has reached hundreds of meters, or even kilometers. Rolling speed has reached 25m / s. Therefore, the traditional technology to build a cooling bed to meet the above requirements of the length and speed of the rolling mill will make the cooling bed too long, the plant is too long, cooling bed transmission technology, equipment problems can not be solved, the construction investment is also large. For example, the maximum line speed of S finished products in China is 16m / s, the length of flying shear section is under 100m, the length of cooling bed is 120m, the cooling bed weighs 700 tons, and sometimes can not satisfy the speed brake when the finished product is unloaded on the cooling bed The required sliding distance requirements. In China, the new φ260mm semicontinuous small continuous bar mill put into operation at A Factory in China produces billet and rebar with φ12-25mm, of which billet is 120mm long and 6m long. The finishing speed of φ12mm round (thread) steel Up to 17m / s, but only 66m long cooling bed that meets the production requirements. This is because