Universal rolling technology for rails

Abstract

The invention discloses a universal rolling technology for rails, which can prevent the head of a rail-shaped rolled piece from being suspended in a rolling process. The technology comprises the following steps: a billet is cogged in a BD region to form a rail-shaped rolled piece; after the rail-shaped rolled piece is rolled out of a pilot hole of the BD region and before the rail-shaped rolled piece enters a universal region, the waist of the rail-shaped rolled piece is changed into a vertical state through the overturning of a turnover device; then, the rail-shaped rolled piece is conveyed into the universal region for intermediate rolling and fine rolling through a vertical universal mill and a vertical edging mill; in the rolling process of the universal region, the waist of the rail-shaped rolled piece is in the vertical state, the abdominal cavity of the rail-shaped rolled piece is rolled through a left vertical roller and a right vertical roller of the vertical universal mill, and the head of the rail-shaped rolled piece is supported by the left vertical roller and the right vertical roller of the vertical universal mill; and the rail-shaped rolled piece is conveyed into a rail printer for printing, and the rail-shaped rolled piece after printing is conveyed into a cooling bed for cooling. By adopting the technology, the final finished rail has the advantages that the head is fully filled, the abdominal cavity has better processing quality, and the working tread is better filled and has better symmetry.

Description

technical field [0001] The invention relates to a rolling process of a steel rail, in particular to a universal rolling process of a steel rail. Background technique [0002] At present, the rail production process generally adopted by modern rail production enterprises is: electric furnace or converter-LF furnace-VD furnace-continuous casting-slow cooling-heating-high pressure water descaling-BD area blanking-universal area intermediate rolling and finishing rolling - Printing - Cooling - Straightening - Inspection Center - Re-straightening - Saw Head Drilling - Quality Inspection - Shipping. Among them, the rail-shaped rolled pieces after blanking in the BD area are transported to the universal area by the roller table for intermediate rolling and finishing rolling. After the rail-shaped rolled pieces enter the universal area, such as figure 2 As shown, the waist of the rail-shaped rolled piece is always rolled in a horizontal state, and each universal rolling mill in the...

AI Technical Summary

Problems solved by technology

[0003] 1. During the rolling process of the universal rolling mill, since the head of the rail-shaped rolling piece in the pass is suspended, the rail-shaped rolling piece may be twisted in the pass, and the twisted rail-shaped rolling piece is rolled Uneven stress during the process leads to poor symmetry of the final finished rail, and the symmetrical difference between the upper and lower legs reaches 2-3 mm;

[0004] 2. The rail-shaped rolled piece after twisting may also cause the upper and lower horizontal rolls of the universal rolling mill to rub in their respective axial directions, so that one side of the upper and lower horizontal rolls has a large force and the other side has a small force, which leads to rail-shaped The force on the abdominal cavity of the rolled piece is uneven, the processing quality is good at the place with greater force, and the processing quality is poor at the place with less force, which eventually leads to poor processing quality of the finished rail abdominal cavity;

[0005] 3. Due to the uneven force of the twisted rail-shaped rolled piece, it will lead to poor filling of the working tread;

[0006] 4. The twisted rail-shaped rolling piece will also cause abnormal wear to the roll, thus damaging the original pass of the roll

However, this method is extremely unstable after field application. After rolling 100 billets, the pass will return to the original state due to wear and tear, and the rolls need to be remixed, resulting in low production efficiency and high production costs.

Images