Cold-rolled ribbed steel bars making machine
Cold-rolled ribbed steel bars are an important material in the construction industry and are widely used in housing construction, cement pipe making, road and bridge construction, cement manhole covers, prestressed electric poles and other fields. As cold-rolled ribbed steel bars are increasingly used in the development of the national economy, their usage is also growing. In order to further improve the production efficiency and quality level of cold-rolled ribbed steel bars, it is of great significance to strengthen the research on cold-rolled ribbed steel bar production equipment and technology.
Process flow of cold-rolled ribbed steel bar production line
Cold-rolled ribbed steel bar is a kind of steel bar with crescent-shaped transverse ribs on two or three sides. Its production base is hot-rolled wire rod. The main production equipment includes cold rolling mill, drawing machine, coiling machine, wire arrangement machine, powder coating machine and cooling water system.
In the production process of cold-rolled ribbed steel bars, the technological process should follow the following four principles:
(1) For steel bars with a prestress level exceeding 800, it is necessary to ensure two key quality indicators: reverse bending and elongation. The production process is as follows: first, the base material is unloaded from the line; second, it is uncoiled; third, stress relief is carried out; and finally, it is recoiled.
(2) For non-prestressed steel bars of grade 550, it is essential to ensure that the quality inspection results meet the standards, and on this basis, strive to maximize the negative deviation.
(3) For odd-sized products with a prestress level of 550, to ensure the stability of quality, four passes of rolling are required, followed by secondary stress relief, and then two passes of rolling on a single stand.
(4) The nominal diameter of cold-rolled ribbed steel bars is defined in relevant standards as the distance from the base circle point to the rib center height. Therefore, during the design of the die and subsequent adjustments, the diameter of the finished product's base circle should be controlled to be 0.3 to 0.5 mm less than the standard nominal diameter.
