Recently, Shougang Institute of Technology Metal3D printingThe R&D team and the engineering and manufacturing team of Beijing Shougang Electromechanical Co., Ltd. jointly tackled key problems and successfully transformed the metal3D printingThe remanufacturing technology was applied to the repair work of the window surface of the rolling mill of the hot rolling production line of the joint-stock company and Jingtang Company, which increased the service life of the equipment several times, and achieved a new breakthrough in the group’s internal research and development of this technology from the laboratory to the industrial application.
As one of the most anticipated technologies of Industry 4.0, metal3D printingTechnology can not only directly print and manufacture complex parts, but also repair and modify parts, so that waste parts can be “reborn”, which is of great significance to the innovation and promotion of manufacturing and green and sustainable development. “Made in China 2025” has will3D printingTechnology is included in key development areas.Currently, metal3D printingThe technology has been successfully applied in high-end manufacturing fields such as aerospace, military industry, medical treatment, etc., showing unique advantages in quality, efficiency and cost, but the application in the field of iron and steel is rare. The harsh service environment is metal3D printingThe main challenges facing the technology.
In response to the potential demand for remanufacturing of key equipment in the iron and steel industry, the scientific research team of Shougang Technology Research Institute3D printingThe key issues in remanufacturing technology, such as powder particle size distribution, particle shape, material properties, energy input in remanufacturing process, microstructure phase transition, stress distribution, pre-processing and post-processing technology in remanufacturing process, etc., are systematically studied. Laboratory research and development is progressing smoothly, but the effect of practical application remains to be tested in practice.
At this time, Shougang Jingtang Company proposed the need for repairing the F3 arch of the 2250mm finishing mill, and the project team composed of the Technology Research Institute and the Electromechanical Company immediately began to conduct research and preparations.
There are generally two kinds of traditional rolling mill arch repair methods: one is the mechanical processing method, which is only an expedient measure. After the repair is completed for a period of time, the surface of the arch will be corroded and worn out, and repeated machining removal will cause damage to the arch. The other is the arc surfacing method, which is generally rarely used because large-area arc surfacing welding is performed on a rigid structure, and the welding residual stress and cracking tendency may cause deformation of the archway structure. bring greater risk.At this time, the metal is fully revealed3D printingThe use of this new technology can completely avoid the defects of traditional repair methods, and the entire repair process can accurately control the overall size of the equipment. What’s more, the special powder material used can greatly improve the corrosion resistance and resistance of the arch. Grinding property, the annual corrosion and wear amount is within 0.1mm, the online cycle of the archway is as long as 8-10 years, and the service life is greatly doubled.
Metal3D printingRemanufacturing technology has obvious advantages in the repair of arches, but it is difficult to implement it smoothly. This is the first time that this technology has been combined with the key equipment of the production line online, and due to the heavy on-site production tasks at the base, the repair time window is only 96 hours. Within these 96 hours, on-site engineering surface processing, on-site laser remanufacturing, A series of steps such as finishing, on-site inspection and review. In order to ensure a first-time success, the project team spent 6 months perfecting the preparations: material selection based on performance evaluation, powder supplier selection based on microscopic analysis, and remanufacturing process based on arch materials Window definition, repeated offline scale model repair drills, anticipating potential problems and formulating solutions… Repeated thinking and a lot of preparation work in exchange for a successful online repair of the window surface of the F3 arch of the finishing mill , and the completion acceptance was completed 16 hours ahead of the scheduled construction period, and the repair results were full of praise from the on-site personnel.
The project team summed up experience and cooperated to continuously improve the repair efficiency and reduce the repair cost. In the follow-up, the repair work on the window surfaces of the multi-stand rolling mills of the joint-stock company 2160mm and the Jingtang company 1580mm has been successful many times. This efficiency enhancement, quality upgrade and upgrade provide strong innovation support.
(responsible editor: admin)
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