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现代化开坯机有三种型式: 方坯初轧机——它是可逆式二辊机座,上辊提升高度小,主要生产方坯。方坯一板坯初轧机——它也是可逆式二辊机座,但其上辊提升高度大,即可生产方坯,又可生产板坯。如日术冰岛厂的Φ1350毫米方坯一板坯初轧机,上辊提升高度为2100毫米(最大2500毫米)。万能板坯初轧机——它是四辊万能机座,具有两个水平辊,两个立混。立辊可布置在水平辊的前或后。主要生产板坯,有时也可生产方坯。
Modern billet machine has three types: the billet initial mill - it is a reversible two-roll stand, the lifting of the upper roller is small, the main production billet. Billet - a slab rolling mill - it is also reversible two-roll stand, but the lifting of the upper roller height, you can produce billet, but also the production of slabs. Such as the Nippon Steel’s Φ1350 mm billet-slab bloom mill, with an upper roll lift of 2100 mm (up to 2500 mm). Universal blank mill - it is a four-roll universal frame, with two horizontal rollers, two vertical mixing. The vertical rollers can be arranged in front of or behind the horizontal rollers. The main production slab, and sometimes can produce billet.