To put it bluntly, the use of appearance engineering technology is coating, and protecting the appearance of furnace rolls has become a widespread phenomenon. According to different directions and temperatures, in order to meet the corresponding application requirements, coatings with corresponding functions are prepared, such as low-temperature supersonic spraying, medium-high temperature plasma or blasting spraying. These coatings mainly play a corresponding role in wear resistance, thermal barrier shielding and roll surface maintenance, which greatly improves the anti-pillow function of the furnace roll surface and plays a vital role in improving the quality of strip products. However, even with the barrier maintenance effect of the coating, tumor spots such as pitting and micro-protrusions will still appear on the coating surface under the summary effect of the residue on the surface of the steel strip, repeated touching of the steel strip and the temperature and atmosphere conditions in the furnace. . Once these punctate raised tumors adhere to the coating surface, it is difficult to separate by themselves, and will gradually increase, which has a serious negative impact on the appearance quality of the strip and needs to be strictly controlled. In addition, with the prolongation of the operating time of the furnace rolls and the long-term contact of the steel strip, the surface roughness of the coating gradually decreases, and the surface roughness of some furnace rolls decreases greatly, becoming too lubricated and slipping during the operation process, which is not conducive to the steel. Belt transmission also needs to be prevented.
Will Scratches on the Sink Hearth Roll Affect Performance? Sunken hearth rolls are widely used in the casting production of wear-resistant castings. However, hot dip galvanized sink rolls are sometimes scratched during production and processing. Why is this happening? Will scratches affect the performance of hot-dip galvanized products? Wait for a series of questions to pop up.
Furnace roll scratches refer to the mutual movement between the strip and the submerged roll. The speeds of the two are inconsistent, and relative sliding occurs, and the surface of the strip is scratched by the surface of the submerged roll. Furnace roll scratches are one of the surface defects of products in the continuous production of hot-dip galvanized coils. It not only directly affects the appearance of hot-dip galvanized products, but also affects the performance of hot-dip galvanized products, and also reduces the resistance of hot-dip galvanized products. Corrosive, so that the product will corrode at the scratch during the use or transportation process, and lose the proper characteristics of the hot-dip galvanized product; in addition, the hot-dip galvanized sheet with scratches by the sinking roller cannot be used as the production substrate of the color-coated sheet .
In short, the scratches on the furnace rolls are very harmful to our hot-dip galvanizing production enterprises. Therefore, we must understand the mechanism of sunken roller scratches in order to take effective measures to prevent and control the occurrence of sunken roller scratch defects.