A core branch of additive manufacturing, metal 3D printing employs digital models to direct the melting and stacking of metal powders layer by layer to create solid components. Among its basic operations are electron beam melting (EBM) and selective laser melting (SLM). In SLM, high-energy laser beams are used to melt metal powders, allowing for the layer-by-layer construction of complex structures through precise control of the laser scanning paths. Based on Siemens Energy's approach, its SLM-built gas turbine burner combines 13 welded components into a single unit, greatly extending component lifetime and dependability.
There are three key benefits of this technology: first, it uses more than 95% of the material, which is much better than the 60%-70% used in regular casting methods; second, it can create complex shapes that are difficult to make with traditional methods, like honeycomb patterns for cooling in engine cylinder heads; and third, by optimizing the design, parts can be made 30%-70% lighter while still being strong. Using metal 3D printing, Siemens Energy's research has demonstrated that the weight of cylinder heads dropped from 5095 grams to 1755 grams, therefore producing a 65% reduction in volume and a 40% boost in heat dissipation efficiency.
By means of Materials Solutions, Siemens Energy has developed a manufacturing system spanning ninety industrial metal 3D printers. Using SLM technology, the gas turbine blades made are designed to improve airflow inside them by mimicking nature, which helps burn fuel more efficiently and reduces the need for cooling air. The technological novelty resides in material innovation: the creation of nickel-based alloy powders fit for high-temperature conditions, which can keep a service life of 100,000 hours at 650°C.
Tailored manufacturing of blade flashers has been achieved through 3D metal printing technology to address the challenges of conventional blade production, which relies on molds and incurs high costs. Topological optimization design has reduced the lightning arrester's weight by forty percent and tripled the installation efficiency. This technology can reduce maintenance costs by 20% and significantly improve the overall lifetime economy of power-producing equipment in the context of offshore wind power.
3D metal printing has solved the challenging issue of machining microchannels that is difficult to reach with conventional methods in the evolution of microturbine engines. UFor a 50mm microair-cooled turbine as an example, the wall thickness of the cooling channel produced by 3D printing is just 0.3mm, therefore improving the cooling efficiency by 50% and obtaining a power density three times higher than in conventional designs.
Three dimensions mirror the three-fold application value of metal 3D printing in the energy sector:
AAccording to Siemens Energy's practices, equipment use has surged by 200%, while the production cycle for burner components made with 3D printing has been cut from 12 weeks in conventional methods to 4 weeks. The customized production of blade flashers has reduced the delivery cycle from 60 days to just 7 days in the wind power generation sector, thereby meeting the demand for quick responses in the market.
DA direct reduction in manufacturing costs results from improved utilization of materials. UUsing gas turbine blades as an example, conventional casting techniques waste up to 30% of materials, while 3D printing results in only a 5% loss of supporting materials. IIn the sector of energy equipment operation and maintenance, 3D printing technology has reduced maintenance response times to within 24 hours and decreased spare parts inventory costs by 40%.
Topology optimization design increases the heat dissipation area of the engine cylinder head by 80%, resulting in a 66% reduction in weight. IIn the field of microenergy equipment, 3D printing technology has achieved precise fabrication of microchannels at a 0.1mm level, thus providing opportunities for innovative design of essential components, such as fuel cell bipolar plates.
Despite the great technological benefits, the use of metal 3D printing in the energy sector still presents three main difficulties.
TThe limited use of current metal powders in high-pressure components is due to their fatigue strength being 15% to 20% lower than that of manufactured materials. The key to progress is developing new types of alloys, like special titanium alloys made with laser additive manufacturing, that can achieve a yield strength of 900 MPa or more.
Process optimization still has to overcome the dimensional deviation brought about by thermal deformation. UBy using multi-physics simulation technology, Siemens Energy manages the dimensional accuracy of cylinder heads to within ± 0.05mm, which is 50% more precise than what conventional methods allow.
No industry certification exists for the 3D-printed components of energy equipment. EEstablishing a comprehensive system of process standards that includes materials, procedures, and testing is part of the current breakthrough path. For metal 3D-printed components, for instance, the German VDI 3405 standard has standardized the procedures of fatigue performance testing.
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