No-slit hot rolling of railroad rails

摘要

A method of recycling a one-piece rail having a base portion and a head portion spaced from each other by a substantially flat web portion. The steps include: heating the rail to a plastic state; feeding the heated rail through a first reduction pass to reduce a cross section of the rail without slitting the rail, thereby forming a bar; feeding the bar through a second reduction pass in which the cross section of the bar is further modified and then slitting the bar along the web portion into two bar pieces, one containing the former head portion and one containing the former base portion, as the bar leaves the second reduction pass; and rolling the two bar pieces, in a single pass line, through a series of reduction passes to produce a desired final cross section of the pieces.

主权项

1. A method of recycling a one-piece rail having a base portion and a head portion spaced from each other along an axis by a substantially flat web portion, said method comprising:
heating the material of the rail to a plastic state, feeding the heated rail through a first reduction pass to form a bar having a former head portion, a web portion and a former base portion in which a starting cross section of the rail is reduced in at least one dimension without slitting the rail or the bar, feeding the bar through a second reduction pass in which the cross section of the bar is further modified such that the height of the former head portion, the height of the former base portion, and the web portion are substantially equal to each other, slitting the bar along the web portion into two substantially identical pieces, one piece containing the head portion and one piece containing the base portion, as the bar leaves the second reduction pass, rolling the two pieces of the bar through a series of reduction passes to produce a desired final cross section of the bar pieces, whereby both bars are passed through identical shaped rollers to produce substantially identical shaped bar pieces.