With the continuous development of industry, steel mill pinch roll is one of the important production equipment, and its performance and life have an important impact on production efficiency and quality. However, due to long-term use or improper operation, the pressure wheel is prone to wear, corrosion and other problems, and needs to be repaired. Traditional repair methods such as surfacing welding and spraying have certain limitations and shortcomings, while laser cladding repair technology has become a new and effective repair method.
1. Laser cladding repair technology
Laser cladding repair technology uses a high-energy laser beam to quickly melt alloy powder or ceramic powder with the surface of the substrate to form a coating with excellent performance. To achieve the purpose of remediation technology. This technology has the advantages of easy operation, high repair quality and low cost, so it has been widely used in the field of pinch roll repair in steel mills.
Second, the laser cladding repair process
1. Surface pretreatment
Before laser cladding can be repaired, the surface of the pinch roll needs to be pre-treated. First of all, clean the surface to remove impurities such as oil and rust;It is then roughened to form a certain number of micro-pits on the surface to improve the adhesion of the cladding layer.
2. Preparation of alloy powder or ceramic powder
Choose the right alloy powder or ceramic powder according to the repair requirements. Mix the powder with the right amount of binder evenly to prepare a suitable cladding material.
3.Laser cladding operation
The prepared cladding material is evenly coated on the surface of the pinch roller, and then the coating is quickly melted with a high-energy laser beam. Under the action of the laser, the coating quickly fuses with the surface of the substrate to form a cladding layer with excellent performance.
4.Post-processing
After the laser cladding is completed, the cladding layer needs to be post-processed. First, the cladding layer is cooled;Then polishing, trimming and other treatments are carried out to remove defects such as surface burrs and flashesFinally, performance testing and evaluation are carried out.
3. The application effect of laser cladding repair technology
After the pinch roll is repaired by laser cladding repair technology, its service life and performance can be significantly improved. Specifically, the laser cladding layer has excellent properties such as high hardness, high wear resistance, and high corrosion resistance, which can effectively protect the surface of the substrate from wear and corrosion. At the same time, laser cladding repair technology is easy to operate and inexpensive, which can quickly complete the repair work and reduce production downtime. In addition, the laser cladding layer has strong adhesion to the surface of the substrate, is not easy to fall off and crack, and has good reliability and stability.
IV. Conclusions
As a new pinch roll repair method, laser cladding repair technology has the advantages of easy operation, high repair quality and low cost. When pinch rolls are repaired with this technology, their service life and performance can be significantly improved, production downtime can be reduced, and maintenance costs can be reduced. Therefore, laser cladding repair technology has a broad application prospect in the field of pinch roll repair in steel mills.