Process method for producing large-specification round bars on small-scale continuous rolling production line

Abstract

The invention relates to a process method for producing large-specification round bars on a small-scale continuous-rolling production line. The process method comprises the following steps: (a) setting a roughing mill to be a high-rigidity short-stress strand mill; adjusting the rough-rolling and guide-rolling precision; eliminating head, middle and tail size differences; (b) setting the width of a traffic roller of either rolling line to be 150mm or 220mm; setting the supporting mode of the traffic roller to be cantilever support or both-end support; setting the elevation difference of the two traffic rollers to be 20mm; increasing the motor capacity of a variable-frequency roller of either large-scale system by 30 percent; varying the two systems with the specifications while unchanging group conditions; and (c) practically measuring technological parameters, such as reduction, extension, and the like on the spot. Compared with the prior art, the invention has the advantages that the technologies of loop tensionless rolling control and microtension rolling control are applied, and hot-rolling round bars with the wide group intervals and the diameters of 20-120mm are produced on a small steel bar continuous-rolling production line according to group intervals of different specifications, thereby saving national resources and improving the capabilities of enterprises for adapting to markets.

Description

technical field [0001] The invention relates to the field of steel production and manufacture, in particular to a process for producing large-size round steel on a small continuous rolling production line. Background technique [0002] At present, there are nearly ten small bar (special steel) continuous rolling production lines in my country, but the range of product specifications is narrow (below φ60mm). The rolling of its production process adopts micro-tension (micro-drawing) rolling control technology, and the adjustment of roughing mill and roughing guide adopts large gap control, and the size of the material fluctuates greatly; The type difference elimination ability is poor, and the size difference of the head, middle and tail is relatively large, which exceeds the tolerance requirement, and it is difficult to roll out qualified large-size round steel products. Contents of the invention [0003] The technical problem to be solved by the present invention is to pr...

AI Technical Summary

Problems solved by technology

The rolling of its production process adopts micro-tension (micro-drawing) rolling control technology, and the adjustment of roughing mill and roughing guide adopts large gap control, and the size of the material fluctuates greatly; Poor shape elimination ability, large difference in size of head, middle and tail, beyond the tolerance requirements, it is difficult to roll out qualified large-size round steel products