From：Guangdong Lanwan Intelligent Technology Co., Ltd. Release time：2019-12-04
Overview：3D printing helps China Aviation to produce highly integrated engines.
3D Printing Highly Integrated Engine
3D printing helps China Aviation to produce highly integrated engines.
Every reduction in the weight of the aircraft parts will save the aircraft a lot of fuel consumption. Take a Boeing 737 aircraft with a take-off weight of 65 tons as an example. If the fuselage is reduced by one pound (about 0.45 kg), it will save dozens of years $ 10,000 fuel cost.
At the 18th Beijing Air Show held recently, China Aviation Development Corporation demonstrated the lightweight engine design results obtained by China Aviation Development's additive manufacturing engine project. Selective laser melting metal 3D printing technology has helped China Aviation Development's additive manufacturing engine project to manufacture multiple parts, realize the integrated design of engine parts structure, and realize integrated printing.
The components of the additive manufacturing engine in the China Aviation Development's additive manufacturing engine project are manufactured by Platinum Power using BLT-S310 equipment. The project has two main innovations:
1. Established an integrated design technology for engine parts based on additive manufacturing technology. Through this integrated technology, a highly integrated small turbojet engine based on additive manufacturing technology was developed. The integration rate of parts was as high as 81%, which reduced Difficulties in engine assembly, improving engine reliability and maintainability;
2. Established lightweight parts design technology for additive manufacturing and topology optimization technology. Great breakthroughs have been made in the optimization design of innovative structures such as hollow centrifugal impellers, hollow turbine shafts, and hollow turbine disks. Hollow rotors have been implemented using additive manufacturing processes. Pieces of processing.
Among them, the director evaporation tube assembly and the tail nozzle are thin-walled structures. Traditional processing methods are assembled from multiple parts. Now 3D printing technology is used to directly integrate the multiple parts into one. The turbine shaft is a cavity structure. In the course of the project, Polytec carried out component feature identification, design area division, topology optimization calculation, and model reconstruction on the turbine shaft, and achieved an overall structure weight reduction of about 19%.
At the same time, Polytec also completed the additive manufacturing of centrifugal impellers, impeller discs and other components. The thickness of the thinner part of the impeller disc was 0.8mm. Polytec adopted size compensation to control the blade accuracy and control the deviation within 0.1mm. After the impeller disc is over-rotated and ruptured, the speed can reach 122000r / min. In addition, Polytec also assisted in solving the problem of blade and runner size control in the project.
Throughout the project, Platinum fully took into account the needs of customers and the requirements of the aero-engine in terms of structure, performance, process, strength, stiffness, weight and other aspects. It carried out research on the integration and lightweight design of engine parts to achieve integration of complex parts Printing helps CNAF to achieve the project goal of "reducing the number of engine body parts by more than 50% and reducing the mass of the engine body by not less than 15% compared to engines using traditional processing technology".
Good workability, low density, good corrosion resistance, good thermal performance, low weight. Titanium alloy has high strength and low density, good mechanical properties, and good toughness and corrosion resistance. In addition, the titanium alloy has poor processability and is difficult to cut, and it is very easy to absorb impurities such as hydrogen, nitrogen, nitrogen and carbon during hot working.
HP nylon PA12 is a kind of material that has very high strength and good heat resistance. HP has accumulated in the printing industry for a long time, which makes the multi-jet melt 3D printing technology using HP patented technology very suitable for small batch production. The polyamide PA12 molecular backbone contains a large number of polar amide groups, which causes a strong force between polyamide molecules and can form hydrogen bonds(the greater the density of hydrogen bonds, the better the mechanical strength, the more carbon atoms, the worse the strength), At the same time, the polyamide PA12 molecules are arranged neatly and crystalline; The polyamide PA12 molecular main chain section also contains methylene, which makes the polyamide PA12 flexible and can affect the polyamide PA12 melting point and vitrification temperature.
Good toughness, high hardness, production of hard functional components, production of high-quality components at very low unit cost, materials imported from the United States, with FDM certification (accessible food-grade materials). PA12GB and PA12 belong to engineering plastics. PA12GB has higher mechanical properties, dimensional stability, heat resistance and aging resistance.