Application of laser cladding technology in coal mine equipment
The hydraulic support is the main support equipment in the fully mechanized mining process of coal mines. Due to the harsh environment of the mine, the surface is prone to corrosion and wear during the service process, resulting in seal failure and potential safety hazards. Therefore, the surface of the hydraulic support column must be strengthened.
Why laser cladding?
1. At present, most parts such as columns and oil cylinders of hydraulic supports are prepared and maintained by hard chroming. Due to the low bonding strength of the coating, it is easy to crack and the service period is short. It is often necessary to disassemble and transport it from the underground for maintenance and installation work. Large quantity and long cycle.
2. Nowadays, intelligent technology is gradually being promoted in the coal mining industry to realize unmanned underground operation. The application of high-quality and long-service products is an inevitable trend, and higher requirements are put forward for the performance and service period of hydraulic support columns.
3. The service life of the column after laser cladding is more than 5 times longer than the ordinary column by hard chroming, which is a metal surface treatment technology that replaces hard chroming.
4. Laser cladding refers to the method of synchronously feeding powder fillers, using a high-energy density laser beam to melt the base material and the additive material at the same time, and forming a surface coating that is metallurgically bonded to the base material after rapid solidification, thereby improving the base. The process method of material wear resistance and corrosion resistance. The laser cladding coating and the substrate are a strong metallurgical bonding layer. The laser cladding coating optimized by the process has a dense structure, no cracks and bubbles, a thick cladding layer, and good strength and toughness. It is a green and environmentally friendly technology.
Advantages of laser cladding
1. A completely dense and crack-free coating can be obtained
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2. Less heat input, less and controllable workpiece deformation, less subsequent processing, and small heat-affected zone.
3. The dilution rate is low, the base material melts into the cladding layer, which leads to a small change in the alloy composition of the cladding layer, and the performance of the cladding layer is more excellent.
4. Better control of layer thickness
5. The cooling speed is extremely fast, which belongs to the rapid solidification process, and it is easy to obtain a fine-grained structure or a new phase that cannot be obtained in an equilibrium state, such as an unstable phase and an amorphous state.
6. There are almost no restrictions on powder selection, especially for cladding high melting point alloys on the surface of low melting point metals.
7. It can process specific area, with less material consumption and excellent performance-price ratio.
8. Long service life, the corrosion resistance service life of the post after laser cladding is more than 5 times that of ordinary posts.