Non-groove rolling method for high speed wire bar intermediate rolling train

Abstract

The invention discloses a non-groove rolling method for high speed wire rod roughing mill group and mainly solves rolling technical problem of the high speed wire rod roughing mill group. The non-groove rolling method comprises two pass non-groove rolling, four pass non-groove rolling or six pass non-groove rolling; the ratio of height and width of the rolling component is 0.90 to 1.58, reduction rate of pass is 15 percent to 45 percent, rolling temperature is 1000 celsius degree to 1100 celsius degree, the adaptation range of blank is 120*120mm to 180*180mm, and the absolute spread coefficient range is 0.25 to 0.45. The invention adopts a pass-free flat roller to replace a rough rolling pass roller of the prior art and realizes non-groove rolling of the high speed wire rod roughing mill group. The invention aims to provide the non-groove rolling method for the high speed wire rod roughing mill group adopting the flat roller to replace the rough pass roller, meanwhile, decreasing production cost, improving product quality and productivity of the mill and expanding the adaptation range of blank.

Description

technical field [0001] The invention relates to metal rolling technology, in particular to the rolling technology of a high-speed wire rod rough rolling unit. Background technique [0002] High-speed wire rod production generally adopts the pass rolling method, and the pass system is composed of rough rolling pass, extended pass and finishing pass. The extension and finishing passes are generally elliptical-circular pass systems, and the rough rolling passes are box-shaped, elliptical, and round passes. The main advantage of using this pass system is that the deformation is relatively uniform, the commonality of the pass is good, the transition of the cross-sectional shape of the rolled piece in different passes is relatively smooth, it is not easy to generate local stress, and the cooling of the rolled piece is relatively uniform. This pass system has become the mainstream pass system for high-speed wire rolling. [0003] However, there are following disadvantages in adop...

AI Technical Summary

Problems solved by technology

[0004] 1. Using the pass rolling method, the production must be carried out after grooves are made on the new rolls. The utilization rate of the rolls is low. At the same time, the uneven wear of the roll grooves and the influence of the side walls of the pass reduce the number of reloading of the rolls and increase the consumption of the rolls. higher production costs

[0005] 2. The pass rolling method is adopted. During the rolling process, due to the restriction of the pass side wall on the width of the rolled piece, if the pass and regulation are not properly designed, or the reduction is not adjusted properly, or the rolling temperature and rolling speed fluctuate, It is prone to problems such as overfilling, underfilling, and dislocation of the hole shape, resulting in defects such as ears and folds, which affect the dimensional accuracy and surface quality of high-speed wire products

[0006] 3. Using the pass rolling method, after the rolling groove is worn out, the hole needs to be changed and the machine stopped, which affects the productivity of the rolling mill

[0007] 4. Adopting the groove rolling method, because the roll is grooved, the strength and rigidity of the roll are reduced, and the billet adaptability range is narrow

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