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The laser cladding technology utilizes laser high power density. Under the numerical control of the laser processing system, a thin layer of micro-melting layer is formed on a specified portion of the substrate surface, and a specific composition of self-fluxing alloy powder, such as nickel-based, cobalt-based, is added at the same time. And iron-based alloys, etc., so that they spread evenly in the molten state in the surface layer of the part and reach a predetermined thickness, form a good metallurgical bond with the micro-melted matrix metal material, and have only a small degree of dilution with each other, followed by rapid solidification During the process, a functional cladding material layer having a predetermined special performance different from the substrate is formed on the surface of the component, so that the surface properties of the material can be completely changed, and the surface of the inexpensive material can be highly resistant to abrasion and corrosion. High temperature and other properties. This process repairs holes and cracks on the surface of the material and restores the geometry and performance of worn parts.
Laser cladding is a new surface modification technique, because the laser cladding can melt the high melting point material on the surface of the low melting point substrate, and the composition of the material is also not limited by the usual thermodynamic conditions for alloy metallurgy. Therefore, the range of cladding materials used is quite extensive, including nickel-based, cobalt-based, iron-based alloys, carbide composite alloy materials, and ceramic materials. Among them, the laser cladding of the alloy material and the carbide composite material is relatively mature, and has already obtained the practical application. Due to the near adiabatic rapid heating process due to the high energy density of the laser beam, the thermal effect of the laser cladding on the substrate is less and the resulting deformation is smaller. Controlling the input energy of the laser can also limit the dilution of the substrate to a very low degree (less than 10%), thus maintaining the excellent performance of the original cladding material.
Laser cladding technology can improve the wear-resistance and corrosion-resistance properties of the material surface. It is mainly used to repair parts after wear and enhance the performance of newly manufactured parts. For important parts (such as cylinder liners and pistons in agricultural machinery), due to heavy workload, high temperature, high pressure, erosion, and varying degrees of friction, the amount of wear is large, and parts need to be scrapped and replaced on a regular basis. For cultivating machinery, soil preparation machinery, and harvesting machinery (such as ploughs, cultivators, seeders, and harvesters), the local wear is very fast during operation, and parts are scrapped because of localized damage. In order to improve the service life of parts, repair work has great significance. Laser processing has the unique advantage of selecting the area, and laser cladding can easily repair the worn parts, make the parts not be scrapped due to local damage, improve the reliability and service life of the parts, and regain the better in the case of the minimum input cost. The performance requirements "J. In addition, the use of laser repair of the mold can greatly increase the life of the mold, without the restrictions of shape and size, should also be vigorously promoted and adopted in agricultural machinery manufacturing.
The introduction of laser processing technology has greatly improved the level of the agricultural machinery manufacturing industry. We earnestly hope that all domestic enterprises will strive to create products with independent innovation, so that domestic equipment will embark on an increasingly healthy development situation.
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