In the shipbuilding, petroleum, mining and other manufacturing industries, a large number of pipelines need to be used, and the inner wall of these pipelines will be subjected to different degrees of wear during use and affect its performance and life, so increasing the wear resistance and corrosion resistance of the inner wall of the pipeline is the key to solve this problem.
As a new technology of material surface modification, laser cladding technology refers to the coating material selected by placing different fillers on the surface of the coated substrate, melting the surface layer of the substrate at the same time through laser irradiation, and forming a diluent layer base after rapid solidification and forming a surface coating with the substrate material into a metallurgical combination. Thus, the process methods of wear resistance, corrosion resistance, heat resistance and oxidation resistance of the substrate material surface are significantly improved.
Its main features are as follows:
(1) Ultra-fast melting speed (103 ~ 106℃ / s), so its processing efficiency is very high, and the processing speed is very fast.
(2) A good metallurgical bond is formed between the cladding layer and the matrix, and the cladding layer is dense, the heat affected zone is small and the dilution rate is low.
(3) The selection of cladding materials is diverse, and different alloy proportions can be designed according to different engineering requirements in order to effectively control the structure and properties of the cladding layer during the cladding process.
(4) Laser cladding is a fine processing method, which can be used to achieve local processing of small areas, and there is no direct contact with the parts during the processing, and it will not cause contact damage to the parts, which is easy to realize the automatic control of the processing process. The technique has been preliminarily applied to cladding of pipelines.
At this stage, laser cladding technology can only cover large-diameter pipelines, and for small and medium-sized diameter pipelines, mainly due to the space limitation of cladding, it is difficult for the laser head to enter the pipeline. The realization process is complex and costly, and the conventional laser cladding machining head laser only begins to focus at a relatively distant position. The processing efficiency is low and it is easy to damage the protective mirror, and it is difficult to achieve good processing quality.
The application demand for surface cladding and repair on the inner wall of some high-load parts continues to increase, hoping to have excellent wear resistance, erosion resistance, corrosion resistance, such as bearings, molds, cylinders, cylinders, extrusion cylinders, valves, etc. With the improvement of product service performance and structural complexity, the industry has put forward higher and higher application requirements for the limit scale, versatility and high quality and efficiency of the inner wall laser cladding and repair technology.
Different from the outer wall laser cladding, the laser beam, powder and cooling water in the inner wall laser cladding processing head need to be transmitted to the top of the optical head through a long distance in a limited space. In order to adapt to the processing of smaller and longer inner diameter parts, the inner wall laser cladding processing head requires high integration, high precision and high rigidity.
The Inner Cladding optical system, also known as ICO (Inner Cladding Optics), is the core component of the inner cladding system. ACunity and IXUN GmbH, incubators of Fraunhofer ILT, have set up a joint laboratory and manufacturing plant to meet the needs of different applications in the industry. Developed a series of models of inner wall laser cladding optical system, continuous optimization and upgrading of optical path design, lightweight structural rigidity, water cooling effect, powder aggregation performance, integration, etc. in the maximum extension length, minimum applicable inner diameter range constantly challenging the limit, can meet the industry most specifications of the inner hole, the inner cavity of the laser processing needs. The modular system design and multi-series inner wall optical system can meet the different processing needs of inner wall laser cladding, laser repair, laser welding, laser hardening, etc. All the materials suitable for outer wall laser cladding can be applied.
The Inner Cladding optical system, also known as ICO (Inner Cladding Optics), is the core component of the inner cladding system. Guosheng Laser has developed a series of inner wall laser cladding optical systems for different application needs in the industry. Continuous optimization and upgrading of optical path design, lightweight structural rigidity, water cooling effect, powder aggregation performance, integration, etc. constantly challenge the limit in the maximum extension length and minimum applicable inner diameter range, which can meet the needs of laser processing of inner holes and inner cavities of most specifications and sizes of parts in the industry. The modular system design and multi-series inner wall optical system can meet the different processing needs of inner wall laser cladding, laser repair, laser welding, laser hardening, etc. All the materials suitable for outer wall laser cladding can be applied.
The inner wall laser processing system of Guosheng Laser is designed with the convenience of application fully considered. The system adopts modular design, different movement forms of machine tools and robots, equipped with different specifications of the inner wall optical system, but also can realize the integration of the inner and outer wall laser cladding. At the same time, according to the different product characteristics, process requirements, developed the inner wall laser cladding, repair, hardening and other supporting process specifications.
