Mechanical descaling removal is to use of mechanical methods to remove oxides on the surface of wire rods and process them into a state suitable for subsequent drawing. This type of technology has been applied in the wire rod product industry for a long time.
This kind of oxide scale is Fe₃O₄, which will form on the wire rod when the steel bar is out of the steel-making furnace. The oxide scale is a compound produced by the hot-rolled steel bar in contact with oxygen in the air during the cooling process. Its existence will reduce the gripping force of the concrete on the ribbed rebar, which seriously affects the quality and safety of the project. Therefore, it must be thoroughly removed before the cold rolling process of the steel bar to ensure the quality of the subsequent steel bar rolling.
There are 4 kinds of methods for mechanical descaling:
- Shot blasting process
Dry or wet jet abrasives remove oxides on the surface of wire rods by the impact of abrasives. This technology can quickly complete the cleaning process, but also has the defects of fast wear and tear of equipment, high noise, and low effective utilization of wind energy. The biggest advantage of this technique is that oxide removal is more uniform. After treatment, there is no oxide visible to the naked eye, and even severely corroded wire rods can be cleaned very well.
- Reverse bending deformation process
The wire rod is bent through one or more sets of guide pulleys, and the outer edge of the wire rod produces a large amount of extension. Because the ductility of oxides is lower than that of carbide. Therefore, the oxide scale peels off the surface of the wire rod. Through the tensile test, it can be determined how much the various wire rods are stretched and the oxide scale will peel off. This can help determine an appropriate bending deformation parameter.
The repeated bending technique is a very economical method of descaling. But usually only about 80% to 90% of the hot rolled oxide can be removed. Severe rust cannot be removed. Therefore, when this technology is used, other cleaning technologies will also be used to achieve a better phosphorus removal effect.
The surface of the wire rod is continuously rotatably rubbed with the abrasive material. This step usually follows the repeated bending process. However, some factories also directly use a soft grinding wheel to remove oxides on the surface.
This technique uses a steel brush to clean the surface of the wire rod. Brushes are generally rotatable, and some use static brushes. Steel brushes are generally made of high-strength steel wire. This technique is usually a supplemental cleaning technique.
Mechanical descaling technology was first used in the production of low-carbon steel wire products. Because the technique of repeated bending is the simplest, it is the most widely used, either in a separate surface treatment line or directly in front of the wire drawing machine. At present, the most common applications are the blanking process of the wire rope industry and the production of low-carbon products, as well as the production of mattress steel wires.
People also ask which method is suitable for them.
UKO carbide descaling rollers are a good choice for repeated reverse bending deformation use. The operation of descaling roller is simple and its economic benefit is high. Moreover, the application of descaling roller has no direct impact on the environment. The continuous improvement of mechanical descaling technology will meet higher and higher quality requirements.
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