Application of Laser Cladding in Construction Machinery
Views: 11 Author: Rebecca Publish Time: 2021-10-19 Origin: Site
Industry demand:
Construction machinery includes hoisting machinery, earth-moving machinery, transportation machinery, concrete machinery, railway maintenance machinery and many other types. It is necessary to form wear-resistant coatings on key parts to increase the service life. It also needs to be considered when serving in coastal or humid environments. The corrosion resistance of the equipment. Under long-term harsh working environment, various parts of the equipment are easily damaged, such as peeling, shedding, cracking, corrosion, abrasion, etc. Therefore, construction machinery and equipment and their components need to be maintained or repaired on a regular basis, with heavy maintenance workload and high maintenance costs. At present, most of the construction machinery and equipment parts are repaired by electroplating, thermal spraying and other methods for surface coating, which have various limitations such as pollution, low bonding strength, and short service life. Laser cladding, as an efficient and highly-performed surface engineering, has huge application prospects in the field of construction machinery.
It can be used for the wear-resistant and corrosion-resistant coatings on the surface of shaft parts of different sizes such as hydraulic cylinders, piston rods, and pillars; due to low heat input and small deformation, it has unique advantages in surface cladding of parts with large aspect ratios.
It is used for the wear-resistant hard coatings, erosion-resistant or corrosion-resistant coatings on the inner wall surface of oil cylinder parts, and the rapid repair of local defects on the inner surface.
Used for the remanufacturing and repair of damaged parts, or the manufacture of functional coatings on the surface of new parts. Such as the repair of wear-resistant liners, cylinder blocks, connecting parts assembly surfaces, valve cones and valve seats, etc.
The piston rod is a connecting part that supports the work of the piston. Most of it is used in oil cylinders and cylinder motion execution parts, and it is a frequently moving transmission part. Take the hydraulic oil cylinder as an example, the surface of the piston rod is mostly smashed or scratched, which causes the coating to fall off, and even leaks oil, which causes serious corrosion on the surface of the piston rod and affects the normal operation of the piston rod. Ultra-high-speed laser cladding repair can achieve high-efficiency cladding of 0.8-1.2m²/hr (depending on the coating thickness) to achieve the surface coating of the piston rod, with a single-layer cladding thickness of 0.05-1mm. Because of the small heat input during the cladding process and the small thermal impact on the workpiece, thin-walled or large aspect ratio parts that cannot be applied by other methods without deformation. According to the different application requirements of customers, hard wear-resistant coatings of different materials such as cobalt-based, nickel-based, and composite materials can be formed on the surface of the parts. The maximum hardness of the coating can reach HRC65 or higher, and effectively realize crack control.
The pin shaft can be statically fixed and connected, or it can move relative to the connected part. It is mainly used for the hinge joint of two parts to form a hinge connection. Once the pin shaft fails due to wear, it will cause the working state of the equipment parts to jitter and even affect the direction of movement of the parts. The loss and failure of the pin is mainly caused by wear. The application of ultra-high-speed laser cladding technology to the mechanical pin can effectively improve the hardness of the pin surface (above HRC65) and wear resistance, and greatly extend the service life of the pin.
