The development of wire rod processing began with the transformation of the finishing rolling unit and controlled cooling process of the wire rod rolling mill. After the high-speed rolling mill production technology matures, it is widely used in the transformation of small and wire rod mills. This is because the twistless finishing rolling mill unit is much better than the horizontal rolling mill in terms of production efficiency and product quality, and is superior to the horizontal rolling mill even when used in the low speed range. Generally, the process characteristics of wire rod processing can be summarized as continuous, high speed, twist-free, and cooling control, among which high-speed rolling is the main process feature. Large plate weight, high precision, and excellent performance are the product characteristics of high-speed wire rod rolling mills. So let’s learn about the process characteristics of wire rod processing and production!

High speed rolling for wire rod processing

After a breakthrough in the rolling speed of wire rod processing, higher rolling speeds are still required. Because the rolling speed is high, the production efficiency is high and the cost can be reduced. So speed is profit. Taking several generations of rolling mills that currently coexist as an example, in terms of output, the annual output of the unit with a rolling speed of 100m/s is 650,000 tons, and the annual output of the unit with a rolling speed of 50m/s is 230,000t. The former is 2.83 times the latter. about.

When using raw materials, it is limited by the import speed of the first frame. When the export speed is constant, the elongation coefficient has been determined. Therefore, a unit with a rolling speed of 100m/s is twice as large as a unit with a billet cross-sectional area of 50m/s. The latter has the restriction that the cross-section of the continuously cast round billet cannot be too small and requires the use of blooming round billet, which may significantly increase the cost.

Judging from the investment situation, the investment in the last high-speed wire rod unit with a rolling speed of 100m/s is lower than that of two sets of 50m/s high-speed wire rod units.

In short, it makes sense to increase the rolling speed.

Wire rod processing technology is one of the core technologies of modern wire rod production. It is an effective means to comprehensively solve the many problems existing in various existing wire rod rolling mills, product varieties and specifications, high cross-sectional dimensional accuracy, large plate weight and high productivity. Only by increasing the speed of finishing rolling can we achieve higher productivity and solve the problem of temperature drop during the rolling process of large heavy wire rods. The high speed of finish rolling requires that the rolled material is not distorted during the rolling process. Otherwise, rolling accidents will occur frequently and rolling will not be possible at all. Therefore, high-speed twist-free finishing rolling is one of the basic features of modern high-speed wire rod rolling mills.

The requirements for "high-speed" technology in wire processing and production technology: first, to ensure the conditions for achieving high speed; second, to solve problems that arise after high speed is achieved.

To achieve high speed, equipment first needs to be able to cope with high-speed operation, such as finishing mills, clamping spokes, laying machines, etc. For twist rolling, the main factor limiting the rolling speed is the equipment. In recent years, finishing mills have been strengthened in order to achieve higher rolling speeds. The precision of the rolling mill becomes higher, the roll shaft becomes thicker, the amount of lubricating oil becomes larger, and the distance between the rolling mills becomes wider.

The main conditions for ensuring high speed in wire rod processing technology are raw material quality, rolling material accuracy, and rolling material temperature. High-precision and high-quality rolling materials are the fundamental conditions to ensure that rolling failures do not occur. Generally, it is necessary to ensure that the deviation of the rolled material entering the finishing mill is less than 0.30mm. When the finished product accuracy requirement is less than ±0.15mm, the deviation of the rolled material entering the finishing mill shall not exceed twice the dimensional deviation of the finished product. The deviation value of the rolled material refers to the entire length of the rolled material (including the head and tail), especially the larger deviation of the head. There are many malfunctions caused by bad heads. In order to ensure the accuracy of rolled products, the dimensional accuracy of steel billets must be strictly controlled. Changes in slab size will affect the size of the rolled material and the tension between the machines, especially the several passes before rough rolling. Therefore, in recent years, the roughing mill unit has adopted a separate transmission to flexibly adjust the rolling speed in a timely manner to ensure micro-tension rolling. The temperature of the rolled material is also an important factor affecting high-speed rolling. In order to ensure the accuracy of the rolled material, it is necessary to ensure that the temperature of the rolled material is uniform and stable. Therefore, uniform heating temperature and sensitive cooling control facilities are required.

The above introduction is the technological characteristics of wire processing and production. If you need to know more, you can contact us at any time!