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组成现代周期轧管机组的12架减-定径机,在周期轧管机后轧制薄壁管的直径压下量可以达到14%。此时,由于减-定径机同时工作的机架数量不同,因此,钢管的直径压下量可达很宽的范围。值得注意的是,在所轧制的品种中钢管相邻规格的彼此直径差为26～28毫米,因而,供给减-定径机的钢管直径范围是很宽的。在这个机组上,利用全部12个机架、最大压下量30～35毫米,可轧出最小尺寸的成品钢管(工艺Ⅰ),而同样直径的钢管,利用后部的4～5机架,直径压下4～10毫米,则可轧出大尺寸的成品钢管
The 12 reduction-sizing machines that make up the modern-cycle pipe-rolling unit can achieve a 14% reduction in the diameter of the thin-walled pipe after the rolling of the rolling mill. At this point, due to the reduction of sizing machine at the same time the number of different racks, so the diameter of the steel pipe down to a wide range. It is noteworthy that the difference between adjacent diameters of the steel pipes in the rolled product is 26 to 28 mm, so that the diameter of the steel pipe supplied to the reduction-sizing machine is wide. In this unit, the use of all 12 racks, the maximum reduction of 30 to 35 mm, can roll out the smallest size of the finished steel pipe (process Ⅰ), while the same diameter steel pipe, the use of the rear 4 to 5 racks, Diameter 4 to 10 mm, you can roll out large-size steel pipe