| YAO Shao-ke,SUN Hui-lei,LI Zheng-yang,JIANG Hua-zhen.Effect of Fractal-based Subarea Strategy on Substrate Deformation Produced by Laser Melting Deposition[J],52(3):399-407 |
| Effect of Fractal-based Subarea Strategy on Substrate Deformation Produced by Laser Melting Deposition |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.03.038 |
| KeyWord:additive manufacturing laser melting deposition scanning strategy fractal curve warpage deformation |
| Author | Institution |
| YAO Shao-ke |
Wide Field Flight Engineering Science and Application Center, Institute of Mechanics, Chinese Academy of Sciences, Beijing , China;School of Engineering Science, University of Chinese Academy of Sciences, Beijing , China |
| SUN Hui-lei |
School of Mechanical Engineering, Hebei University of Science & Technology, Shijiazhuang , China |
| LI Zheng-yang |
Wide Field Flight Engineering Science and Application Center, Institute of Mechanics, Chinese Academy of Sciences, Beijing , China |
| JIANG Hua-zhen |
Wide Field Flight Engineering Science and Application Center, Institute of Mechanics, Chinese Academy of Sciences, Beijing , China |
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| Abstract: |
| Laser melting deposition is an advanced manufacturing technology that can manufacture complex structures. In laser melting deposition, localized heat source leads to massive residual stresses and pronounced deformations. To reduce the substrate deformation during laser melting deposition and improve the flexibility of processing, a novel scanning strategy based on fractal curve is proposed. Experiments are carried out with laser experimental platform which consists of a 1 kW fiber laser, a KUKA robot, a coaxial nozzle and a powder feeder. Argon is used as the shield gas. Substrate and powder are 316L stainless steel. The powder size is 50-100 μm. First, whole area scanning strategies are used in laser deposition process. The scanning strategies are raster, Peano curve, Sierpinski curve and Lebesgue curve. The substrate size is 130 mm×130 mm×5 mm. The deposited area size is 70 mm×60 mm. The laser spot diameter is 1.2 mm, the laser scanning speed is 5 mm/s, the laser power is 800 W, the powder feeding rate is 10.9 g/min. The substrate deformation of one traditional scanning strategy, i.e. the raster, and three scanning strategies with fractal curves is tested with steel ruler. Then, a combination of fractal scanning strategy and subarea scanning strategy is proposed, i.e. fractal-based subarea scanning strategy. Four kinds of subarea scanning strategies are used in the experiment. The deposited area is divided into 64 square subareas. The orders of subareas in different scanning strategies are raster order, Hilbert curve order, Sierpinski curve order and Lebesgue curve order. The substrate size is 130 mm×130 mm×5 mm. The deposited area size is 72 mm×72 mm. The square subarea size is 9 mm×9 mm. The laser spot diameter is 1.5 mm, the laser scanning speed is 5 mm/s, the laser power is 900 W, the powder feeding rate is 10.9 g/min. The substrate deformation of one traditional subarea scanning strategy, i.e. the raster order, and three subarea scanning strategies with fractal curves is tested with steel ruler. After the experiment, all four sides of the substrates have warped and deformed vertically upwards. The results show that the deformation at the end of laser scanning path is the largest in the case of whole area scanning strategy. Under scanning strategies on whole area, the maximum deformation of the substrate is:7.5 mm for raster, 3.3 mm for Peano curve, 2.5 mm for Sierpinski curve, 3.8 mm for Lebesgue curve, respectively. The average deformation of the substrate is:3.6 mm for raster, 1.6 mm for Peano curve, 1.4 mm for Sierpinski curve, 1.9 mm for Lebesgue curve, respectively. Under different subarea scanning strategies, the maximum deformation of the substrate is:7.5 mm for raster order，3.5 mm for Hilbert curve order, 3.2 mm for Sierpinski curve order, 5.4 mm for Lebesgue curve order, respectively. The average deformation of the substrate is:3.7 mm for raster order, 2.1 mm for Hilbert curve order, 2.3 mm for Sierpinski curve order, 2.3 mm for Lebesgue curve order, respectively. The conclusion is subarea scanning strategy based on fractal curve can significantly reduce substrate deformation and adjust line segments flexibly. The minimum deformation among the subarea scanning strategies is that of Sierpinski curve order, which may be the optimal. |
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