Analysis of Three Methods to Improve the Quality of Cold Heading Steel Wire Rod

Cold heading steel is mainly used to produce bolts, screws and other fasteners. It is widely used in many fields. At the same time, because of its good cold forming performance, it can replace hot rolling in the machining industry, saving a lot of man-hours and reducing metal consumption by 10%. -30%, the surface quality of the finished product is very high, but it is prone to cracking during the cold heading production. It is analyzed that the cause of cracking is not only caused by the scratches of the rolled pieces during the rolling process, but also caused by the corner cracks of the continuous casting billet. needs improvement:

1. Optimize the casting process. In order to prevent cracks at the corners of the continuous casting billet, continuous casting adopts the whole process of protective pouring. The immersion nozzle should be centered to avoid deflection of the injection flow and partial washing of the condensed shell, resulting in a thin corner shell; use low superheat pouring to avoid large overheating and high pulling speed, which may cause crystallizer The intermittent boiling of water in the water gap and the deformation of the billet shell reduce the average thickness of the billet shell; regular inspection of the mold to improve the water quality of the mold to avoid uneven cooling of the billet in the mold.

2. Strict rolling process. The rolling process is lean to avoid surface defects of the rolling pieces in the middle pass. The rolls, grooves, and guides must be updated in time to avoid affecting rolling. In the inspection of the guide and guard, it is necessary to prevent the occurrence of improper torsion angle or improper installation position, which may cause folding. Clean up the oxide scale and metal hanging wire debris during the production line to prevent scratches on the rolled parts. The rolled pieces with ears and scratches must be adjusted in time to ensure the quality of the rolled pieces.

3. Pay attention to other details. Avoid the friction and collision of the wire on the hard ground to cause abrasion. When coiling and packaging, there must be no squeezing damage inside the roll, and a soft belt must be used when hoisting to ensure the surface quality.