Process for rolling large-scale rails into miniature type rails and rollers therefor

Abstract

The invention is a method and a roll for rolling the large-sized rail into small-sized rail. The roll: each group of passes includes a pass whose symmetrical line and the rolling line are vertical and a pass whose symmetrical line and the rolling line are concurrent, each group of passes decreases with the pass size, each group of passes corresponds to a kind of rail; the pass whose symmetrical line and the rolling line are vertical, the shape of roll slot on the two rolls match with the head part and the leg part of the rail; the pass whose symmetrical line and rolling line are concurrent, the slots on two rolls are distributed symmetrically to the rolling line. The method: using above mentioned roller, the large-sized steel rail is rolled with pass whose size is decreased gradually, the two kinds of passes are used alternately, and thus the small-sized steel rail is produced. The method is simple, the cost is low.

Description

Technical field [0001] The invention relates to a method for rolling large-scale steel rails into small-scale steel rails and rolls thereof Background technique [0002] There are two ways to roll small rails from scrap rails. One is to melt waste rails into steel ingots, and then roll the steel ingots into light rails. This method has many steps and needs to go through two heatings and two coolings. The energy consumption is large, the production efficiency is low, the oxidation burning loss is increased, and the metallographic structure is easy to change, so that the quality of the product cannot be guaranteed. The second is to directly roll the waste heavy rails into light rails after being heated in a reverberatory furnace. Disclosed as my country's patent literature a kind of patent No. is 98106563.5 " waste heavy rail to roll light rail technology " invention patent application, the technical scheme of this invention patent application is: there is a rail-shaped pass...

AI Technical Summary

Problems solved by technology

The volume of the rolling mill is large and the power consumption is large

[0004] 2. All adopt flat and inclined passes. The symmetrical axis of the pass forms an angle of 5-20° with the rolling line. The design of the pass is complex, and the size of the pass on the rolling surface is relatively large, which reduces the rolling surface. effective size of

[0005] 3. The size of the rolled piece along the axis of symmetry and the dimension perpendicular to the axis of symmetry are smaller than the size of the pass, which increases the difficulty of the rolled piece entering the rolling groove of the pass, and also increases the wear speed of the pass

[0006] 4. The rail-shaped section is asymmetrical to the vertical axis, which will generate a large axial force during rolling, causing the roll to move axially, changing the thickness of the leg or head of the open rolling groove, and adding complexity to the operation

However, the use of the thrust ring causes the length of the roll to increase and the diameter of the roll to increase, which further increases the complexity of the roll structure, such as figure 1

And utilize the axial force pier thick waist of thrust ring, in the practice of prior art mechanical condition and technical condition are difficult to realize

[0007] 6. In the rolling process, even if the thrust ring is used, the axial force cannot be completely offset, and the wear speed of the bearing and bearing bush is accelerated, which increases the rolling cost

[0008] 7. The uneven distribution of the rolled piece in the pass makes the depth of the rolling grooves distributed on the rolls different, which puts forward higher requirements for the design of the pass

[0009] 8. It is not easy to realize automatic assembly line operation

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