Method for rolling square steel

Abstract

The invention relates to a method for rolling square steel. A frame is at least provided with a frame group consisting of an elliptical hole frame and a round hole frame, and a diamond hole frame and a square hole frame are connected behind the frame group. By the method for rolling the square steel, for steel rolling manufacturers which are put into operation, when square steel and round steel products are collinearly rolled by the same set of continuous rolling unit, the phenomenon of round steel hole pattern accompanying turning caused by nonuniform rolling yield can be effectively avoided, the utilization rate of a roller can be effectively improved, the consumption of the roller is reduced, and times for changing the roller can be reduced; the types of hole patterns are reduced, the sharing performance of on-line hole patterns is greatly improved, the times for changing the roller in a rolling line are reduced, and the roller is fully utilized; fishtail at the tail of a rolled piece, which is formed due to nonuniform deformation, has small length, so that the yield of the rolled piece is improved; the stress concentration of the roller is relatively small, so that risk that the roller is broken is reduced; and a tilting gear in front of a continuous rolling machine is saved, so that equipment investment is reduced.

Description

technical field [0001] The invention relates to a steel rolling method, in particular to a square steel rolling method. Background technique [0002] There are generally two types of common rolling passes for square steel. [0003] The first is to use square square steel or rectangular steel billet as raw material on the reversible roughing mill, through the axial alternate deformation of one or more "box-shaped holes" and one or more "square holes" on the roughing mill, Thereby rolling square steel that meets the size requirements. Such as figure 1 As shown, the reversible roughing mill rolling square steel pass process in the prior art consists of a rectangular box hole 11, a square hole 12, a rectangular box hole 13, and a square hole 14 in sequence. This rolling process is generally to roll the raw material billet into a flat rectangular billet in a box-shaped hole (two passes can be rolled one by one in the pass), and then the rolled billet is rolled by a turning dev...

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Problems solved by technology

[0010] The advantage of this configuration is that when changing specifications, for example, from square steel to round steel, it is only necessary to move other passes on the same stand to the position of the rolling line, so as to combine the pass series of the rolled specifications, avoiding In order to change the purpose of the roll, thereby improving the production efficiency, but in doing so, although the labor efficiency is improved, the rolling square steel must use a fixed square steel pass series, and the rolling round steel must use a fixed round steel pass series. No compatibility between different pass series

In actual production, with the accumulation of rolling output, the pass will inevitably be worn out. After the pass is worn to a certain extent, rolling cannot be continued. The on-line roll must be replaced and turned off-line before the second on-line rolling. However, due to the same There are multiple pass types arranged on the roll. Since the output of different specifications cannot reach a perfect ratio in actual production, the wear of different pass types is inconsistent. It often happens that the diamond-shaped holes or square holes in the square steel series have been worn out. Off-line turning, while the oval hole or round hole or rectangular box hole or square box hole in the round steel series can still be rolled, but in order to ensure the rollability of square steel, it must also be turned off-line. This phenomenon is called "accompanied". "car", accompanying the car not only caused the increase of roll loss and the decrease of roll utilization rate, but also caused the increase of the number of roll changes in the rolling process and the decrease of production efficiency

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