Oreshkin Oleg, Panov Daniil, Kreinest Laura, Temmler André, Platonov Alexander
Moscow Engineering Physics Institute, National Research Nuclear University MEPhI, Kashirskoe Shosse 31, 115409 Moscow, Russia.
Center for Design, Manufacturing & Materials, Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, 121205 Moscow, Russia.
Micromachines (Basel). 2021 Mar 29;12(4):367. doi: 10.3390/mi12040367.
Laser structuring by remelting (WaveShape) is a manufacturing process for metal surfaces in which structures are generated without material removal. The structuring principle is based on the controlled motion of the three-phase line in the area of the solidification front. The contour of the solidification front is imprinted into the remelting track during the continuous solidification process. Typically, harmonic surface structures in the form of sinusoidal oscillations are generated by means of WaveShape with virtually no material loss. However, a significant shape deviation is often observed over a wide range of process parameters. In this study, it was found that much of the shape deviation is concentrated at a spatial wavelength equal to half the spatial wavelength used for structuring. Therefore, an approach to reduce the shape deviations was specifically investigated by superimposing a compensation signal on the harmonic structuring signal. In this approach, a compensation signal with half the spatial wavelength was varied in phase and amplitude and superimposed on the structuring signal. Amplitude and phase shift of the compensation signal were further investigated for selected laser beam diameters and spatial wavelengths. This demonstrated that a shape deviation of harmonic surface structures on titanium alloy Ti6Al4V could be reduced by up to 91% by means of an adapted compensation signal.
激光重熔结构化（波形法）是一种用于金属表面的制造工艺，在该工艺中，结构的生成无需去除材料。结构化原理基于凝固前沿区域三相线的受控运动。在连续凝固过程中，凝固前沿的轮廓被印刻在重熔轨迹中。通常，借助波形法可生成正弦振荡形式的谐波表面结构，且几乎没有材料损失。然而，在广泛的工艺参数范围内，常常会观察到明显的形状偏差。在本研究中，发现大部分形状偏差集中在等于结构化所用空间波长一半的空间波长处。因此，专门研究了一种通过在谐波结构化信号上叠加补偿信号来减少形状偏差的方法。在这种方法中，具有一半空间波长的补偿信号在相位和幅度上变化，并叠加在结构化信号上。针对选定的激光束直径和空间波长，进一步研究了补偿信号的幅度和相移。结果表明，通过采用适配的补偿信号，钛合金Ti6Al4V上谐波表面结构的形状偏差可降低多达91%。
