Medium- and finish-rolling pass structure for four-strand slitting in continuous rolling of phi12 deformed bars

Abstract

The invention relates to a medium- and finish-rolling pass structure for four-strand slitting in continuous rolling of phi12 deformed bars and belongs to the technical field of steel rolling process. According to the technical scheme, No.7 to No.10 frame rolls of an intermediate mill share a pass. When four-strand splitting for rolling of ph12mm deformed bars is performed, steel from an outlet of a No.12 frame mill is phi45mm in size, a No.11 frame mill is used for plane-roll pass-free rolling, a No.12 frame edging mill is idle, a No.13 frame mill of a finishing mill is used for plane-roll pass-free rolling, a No.14 frame edging mill is provided with vertical box type pass, a No.15 frame plane-roll mill is provided with pre-slitting pass, a No.16 frame mill of vertical-horizontal transformation is provided with plane-roll slitting pass, a No.17 frame plane-roll mill is provided with planar elliptic pass, and a No.18 frame mill of vertical-horizontal transformation is provided with plane-roll final pass. Four-strand rolling of phi12 deformed bars is achieved by single pre-slitting only with a No.15 frame mill of the finishing mill, and one frame pre-slitting rolling pass is omitted from the traditional double pre-slitting in four-strand slitting of phi12 deformed bars.

Description

technical field [0001] The invention relates to a bar continuous rolling ∮12 snail four-slit intermediate rolling and finishing rolling pass structure, which belongs to the technical field of steel rolling. Background technique [0002] In order to adapt to the severe production and operation situation of steel, further increasing the production ratio of small-size rebar is one of the ways to improve production efficiency. At present, the two-wire split-rolling technology and the three-wire split-rolling technology of the continuous rolling bar production line have been widely used in the production of small-size rebar as mature split-rolling technologies. In order to further increase the machine-hour output of small-sized rebar, the continuous bar rolling production lines of iron and steel enterprises have invested in the development and production of ∮12 screw four-cutting process. Due to the different selection of process equipment for the finishing mill of each bar cont...

AI Technical Summary

Problems solved by technology

For example, the three vertical roller mills of the finishing mills used in most bar continuous rolling production lines all have the function of horizontal and vertical conversion, but only a small number of production lines have selected the finishing rolling mills to reduce costs, and the two vertical roller mills have horizontal Therefore, higher requirements are put forward for the design of the ∮12 screw four-cut pass type of the production line ∮12 screw four-cut pass type after the finishing rolling unit and the two vertical roll mills after the continuous rolling bar production line. A vertical roll mill has no horizontal-to-vertical conversion function, so it is impossible to realize two consecutive flat roll pre-slits for ∮12mm screw four-slit rolling, and can only use one pre-slit pass design to carry out ∮12mm screw four-slit rolling rolling

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