Two-in-one technic of Morgan '8+4'high-line mill milling round steel and ribbed steel bars

Abstract

The present invention relates to metallurgic technology, and is especially two-in-one pass schedule technology of rolling round bar and ribbed steel bar in an Morgan '8+4' rolling machine. According to plastic deformation theory of metal and through combining with technological practice, ribbed steel bar are rolled via allocating lengthening coefficient reasonably and enlarging the roll gap of pass schedule for rolling round bar, i. e., ribbed steel bars of 6 mm, 8 mm and 10 mm diameter are produced separately in a pass schedule of 5.5 mm, 6.5 mm and 8 mm diameter for producing round bar. The present invention has the features of saving in pass schedule replacing time, reduced faults, raised production efficiency and production stability, decreased technological spares, reduced production cost, etc.

Description

1. Technical field: [0001] The present invention relates to the technology of producing round steel and ribbed steel bar in the metallurgical industry. Specifically, under the condition of Morgan "8+4" high-line rolling mill, the pass system for producing both round steel and ribbed steel bar is combined into one. technology. 2. Background technology: [0002] For steel wire products, there are mainly two categories: round steel and ribbed steel bars. The Morgan "8+4" high-speed rolling mill provided by Morgan Company is used to produce round steel and ribbed steel bars, and it is also an advanced rolling mill at home and abroad. Since Morgan believes that only two sets of pass systems in the rolling mill can ensure that qualified round steel and qualified ribbed steel bars can be rolled out, the rolling process designed by Morgan's "8+4" high-line rolling mill consists of two sets of passes. One set is the round steel pass system for rolling round steel, and the other is ...

AI Technical Summary

Problems solved by technology

However, the two sets of pass systems have great constraints on the production of the production line: 1. The replacement of the pass system takes a long time, at least 4 hours for each replacement, and at least 4 times per month, it takes 32 hours, It takes 384 hours throughout the year, the machine-hour output is 94.6t / h, and the annual output is reduced by 36326t; 2. The reserve of process parts is huge, because the two sets of pass systems from 14# to 26# all use two sets of roller ring guides with different passes in the rolling mill The reserve has doubled, and the capital investment has increased by as much as 5.6 million yuan; 3. The ribbed steel pass system provided by Morgan is designed according to the standard size, and it is difficult to achieve negative rolling; the product failure between the two sets of pass systems The production rate has risen sharply, and the production stability has declined. When the production stabilizes, it is time to switch to another pass system.