Modern train track rails production process
At present, two modern train track rails production processes are mainly used in the world: one is a long-flow process; the other is a short-flow process.
Long process train track rails production process
The long-process process uses ore as raw material, smelted by blast furnace and converter, and then refined outside the furnace and vacuum degassed to effectively control the composition and harmful gases, and then cast into a certain size of billet by a continuous casting machine. After these billets are heated to the rolling temperature in the walking furnace, they form the prototype of the rail, and then undergo reversible multi-pass rough rolling in the universal roughing mill, and finally roll out the finished product in the universal finishing mill. The finished rails are cut to length by the hot saw in the hot state, sent to the stepping cooling bed for cooling, and then sent to the intermediate warehouse for stacking for processing. The cold working process of the steel rail is as follows: first, the steel rail is sent to the horizontal and vertical combined straightening machine for straightening, the surface and internal quality inspection of the steel rail (ultrasonic and eddy current flaw detection) is carried out, then the steel rail is milled and drilled, and finally the processed The finished rails are checked for quality and packaged.
Short process train track rails production process
The short-flow process uses scrap steel as the main raw material, which is roughened by electric furnace, LF refined, and degassed by VD, and then sent to a continuous casting machine to be cast into billets of the required size. The rear process is the same as the long process.
Comparing the two processes, it is not difficult to find that the two processes have many identical processes, such as refining, degassing, continuous casting, universal rolling, etc. These are the main characteristics of modern rail production processes. It embodies the basic requirements of the “three refinements” of rail production, namely refining, finishing rolling and finishing. The rails it produces not only have precise cross-sectional dimensions, but also have good intrinsic quality. These are all incomparable with the traditional die casting and ordinary pass rolling process. With the progress of continuous casting technology, the detection technology and automatic control technology are expected to be combined. In the future, the best process for rail production will be: using continuous casting special-shaped billets directly to the universal rolling mill for rolling, long-length cooling, long-length straightening, using Automated online inspection (inspection center) and other technologies, the process is shorter and the yield is higher. The specific situation is shown in the figure.
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