Construction machinery includes hoisting machinery, earth-moving machinery, transportation machinery, concrete machinery, railway maintenance machinery and many other types. Wear-resistant coatings need to be prepared in key parts to improve service life. It also needs to be considered when serving in coastal or humid environments. Corrosion resistance of equipment. Under the long-term harsh working environment, it is easy to cause damage to various parts of the equipment, such as peeling, falling off, cracks, impact, corrosion, wear and so on. Therefore, construction machinery equipment and its components need to be regularly maintained or repaired, and the maintenance workload is large and the maintenance cost remains high. At present, most of the construction machinery and equipment components are prepared by electroplating, thermal spraying and other methods for surface coating, and there are limitations such as pollution, low bonding strength, and short service life to different degrees. Efficient and high-performance surface engineering technology, remanufacturing repair technology and connection technology have great application prospects in the field of construction machinery.
• Ultra-high-speed laser cladding
It can be used for the preparation of wear-resistant and corrosion-resistant coatings on the surfaces of shaft parts of different sizes such as hydraulic cylinders, piston rods, and columns; due to low heat input and small deformation, it has unique advantages in surface cladding of parts with large aspect ratios.
• Inner wall laser cladding
It is used for the preparation of 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.
• Conventional laser cladding repair
For remanufacturing repair of damaged parts, or the manufacture of functional coatings on new parts. Such as the repair of wear-resistant liners, cylinder blocks, connecting parts assembly surfaces, valve cones and valve seats, etc.
• Laser welding
The use of laser-arc composite heat source welding and laser multi-layer wire filler welding technology for efficient and low-distortion automatic welding of medium and thick wall components can partially replace traditional gas shielded welding, submerged arc welding and other methods, such as the welding of crane boom components.
Laser Application Case
• Ultra-high-speed laser cladding of construction machinery piston rods
The piston rod is the connecting part that supports the work of the piston. Most of them are used in the oil cylinder and the cylinder motion execution part, and it is a transmission part that moves frequently. Taking the hydraulic cylinder as an example, the surface of the piston rod is mostly smashed or scratched, causing the coating to fall off, or even oil leakage, resulting in serious corrosion on the surface of the piston rod, thus affecting the normal operation of the piston rod. Ultra-high-speed laser cladding repair can achieve efficient cladding of 0.8-1.2m²/hr (depending on the thickness of the coating) to achieve the preparation of the surface coating of the piston rod, with a single-layer cladding thickness of 0.05-1mm. Due to the small heat input in the cladding process and little thermal impact on the workpiece, it is possible to process thin-walled or large aspect ratio parts that cannot be applied by conventional laser cladding 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 prepared on the surface of the parts. The highest hardness of the coating is above HRC65, and crack control can be effectively achieved.
• Ultra-high-speed laser cladding of mechanical pins
The pin shaft can be statically fixed or connected relative to the connected piece, and is mainly used for the hinged connection of two parts to form a hinged connection. Once the pin shaft fails due to wear, it will cause the working state of the equipment parts to shake and even affect the movement direction of the parts. The loss and failure of the pin shaft mainly comes from wear and tear. The application of ultra-high-speed laser cladding technology on the mechanical pin shaft can effectively improve the hardness (above HRC65) and wear resistance of the pin shaft surface, and greatly prolong the service life of the pin shaft. , reduce the possibility of connection failure between equipment parts, and improve the work efficiency of the equipment itself.