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Laser cladding and remanufacturing make mining machinery reborn

2022-05-16

Cladding technology is an advanced surface modification technology, which has a wide range of applications. Its purpose is to form a functional layer with high hardness, wear resistance, corrosion resistance, thermal barrier, etc. on the surface of the base material, so as to achieve the purpose of surface modification or repair. Compared with surfacing, spraying, electroplating and vapor deposition, laser cladding has the characteristics of small dilution, dense structure, good combination between the coating and the base, more suitable materials for cladding, and large changes in particle size and content, The application of laser cladding technology in the remanufacturing of mining machinery has a broad prospect.


High loss, mining machinery looks forward to technical innovation

At present, China has become a major producer, consumer and importer of mining machinery. Mining machinery is the general name of various equipment corresponding to mine construction, mining, mine lifting and transportation, crushing, grinding, screening, coal washing, beneficiation and roasting. It has a large amount and a wide range, and the working conditions are bad. The surface of parts is seriously worn, abraded and scratched. According to relevant data statistics, about 1 / 3-1 / 2 of the global energy is consumed in friction. The wear failure caused by friction accounts for 70% - 80% of the equipment damage, and the annual loss is more than 100 billion dollars. In particular, parts working under high-speed, high-temperature and high-pressure conditions will often be scrapped due to surface wear, leading to equipment shutdown.


In addition, the mining machinery is characterized by large volume, high price, difficult loading and unloading, and large maintenance workload. Therefore, when the equipment is stopped due to wear and tear, it will cause huge economic losses. If the wear-resistant materials are improved to improve the processing accuracy of parts and improve the reliability of equipment structure, the wear period of equipment can be postponed. Therefore, it is imperative to carry out the remanufacturing or upgrading of mining machinery.


Anti wear, laser cladding technology came into being

In order to solve the problem of serious wear and corrosion of mining machinery parts, laser cladding technology came into being. This technology is a new technology with high economic benefits. It can prepare high-performance alloy surface on cheap metal substrate without affecting the properties of the substrate. It not only reduces the cost, but also saves precious and rare metal materials.


The laser cladding equipment launched by Wuhan Han's Goldensky Laser System Co., Ltd. uses laser as the heat source, places the selected coating material on the substrate of the object to be coated by different feeding methods, and after laser irradiation, it melts with a thin layer on the substrate surface at the same time, and forms a surface coating with extremely low dilution and metallurgical combination with the substrate material after rapid solidification, Thereby significantly improving the wear resistance, corrosion resistance, heat resistance, oxidation resistance and electrical characteristics of the surface of the base material.


Compared with surfacing, spraying, electroplating and vapor deposition, laser cladding has the characteristics of small dilution, dense structure, good combination of coating and substrate, more suitable materials for cladding, and large changes in particle size and content.


With this set of equipment, it is possible to remanufacture the failed parts in the shearer and roadheader pick, the stainless steel column of the fully mechanized mining hydraulic support, the scraper machine and the gear transmission box. In particular, the laser strengthened coating with metallurgical bonding, hard point and high toughness metal material composite is prepared on the conical surface of the pick end and the easily worn parts of the scraper machine, which greatly improves the average service life.