Two-beam laser thermal cleavage of brittle nonmetallic materials

Shalupaev, S. V.; Shershnev, E. B.; Nikityuk, Yu. V.; Середа, А. П.

doi:10.1364/jot.73.000356

Cited by 19 publications

(3 citation statements)

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“…7 Glass cut by NPTC with YAG [39] (a) Plate; (b) Tube 图 8 不同加工方法的加工边缘强度对比 [40] Fig. 8 Comparison of bending strength of cutting section with multiple cut methods [40] 2009 年富士康公司与俄罗斯莫斯科国立仪器与信息大学 Kondratenko 等 [41] 研究了激光诱导热裂切割厚度达 4~19 mm 的玻璃, 他们采用 CO 2 激光(实际用 20~100 W), 双透镜(柱镜+球镜)形成线形光斑 (长约 40~60 mm, 宽约 1.5~2.5 mm), 辅以空气水混合冷却法控制工艺过程中的开裂阶段, 对 800 mm 800 mm4mm 的玻璃进行了切割, 并对用机械、磨削及激光切割的 6 mm 厚玻璃的强度进行了比较, 得到激光诱导热裂切割玻璃由于断面无表面微裂纹, 质量较好, 其边缘强度是传统机械切割强度的 5.5 倍。断面质量是影响板材强度的关键因素。对于双层玻璃, 提升断面质量的有效方法是使上下层同时得到加热和冷却。2014 年, 韩国 Choi 等 [42] 提出在第一层玻璃下表面涂炭, 并通过脉冲 YAG 激光扫描该玻璃产生等离子体, 该等离子体作用在第二层玻璃上, 改变该层玻璃的光学特性, 同时产生局部的快速加热和冷却, 使得第二层玻璃开裂分离, 其原理如图 9 所示。研究指出激光参数(激光能量与脉冲宽度)和两层玻璃间的距离是影响切割质量的主要因素, 给出了一组最优参数,即当激光峰值功率密度为 45~50 GW/cm 2 , 玻璃间距为 150 μm, 脉冲宽度为 4 ns 时, 断面的质量最好。除了激光热源外, 2016 年 Wang 等 [43] 利用短边收缩聚焦波导, 成功地将微波聚焦成椭圆线型体加热光斑, 实现了同时体加热切割较厚玻璃和碳化硅陶瓷片的突破性进展, 其原理和切割结果分别见图 10 和图 11。研究指出, 短边收缩聚焦波导产生的热源为椭圆形体加热微波热源, 热源在厚度方向透过性较激光热源好, 能够对厚度方向的非透明和透明材料进行较均匀的加热。由此可知, 利用较低的图 9 激光诱导等离子体加工玻璃原理图 [42] Fig. 9 Principle diagram of laser induced plasma processing glass [42] 图 10 微波热裂法切割实验装置图 [43] Fig.…”

Section: 玻璃切割面强度unclassified

Research Progress of Thermal Controlled Cracking of Hard-Brittle Plate

Wang¹,

Wang²,

Wang³

et al. 2018

Journal of Inorganic Materials

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Thermal Controlled Cracking Method (TCCM) has developed for more than 60 years with great success. The research progress of TCCM in the past 60 years was reviewed in two directions, i.e. Premade Trajectory Cutting (PTC) and Non-Premade Trajectory Cutting (NPTC) respectively. For PTC, cutting velocity, trajectory deviation and sectional quality are the main process parameters to be optimized. For NPTC, cutting velocity and sectional quality are the main process parameters to be optimized. The crucial technique for optimizing these above parameters is to adopt new techniques for generating advanced heating source, cooling source and better process flow. These new techniques are expected to provide enormous promotion for the developing of TCCM.

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Section: 玻璃切割面强度unclassified

Research Progress of Thermal Controlled Cracking of Hard-Brittle Plate

Wang¹,

Wang²,

Wang³

et al. 2018

Journal of Inorganic Materials

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“…They predicted the thermal stresses in the substrate material. The two-beam laser processing of nonmetallic materials was considered and modeled by Shalupaev et al [19]. They used the finite element method to predict the thermo elastic fields in the heated material.…”

Section: Elk Asia Pacific Journals -Special Issue Isbn: 978-81-930411mentioning

confidence: 99%

Modeling and Simulation of Temperature Distribution in Laser Cutting of Ti-Alloy Sheet

2015

International Conference on Advancements and Recent Innovations in Mechanical, Production and Industrial Engineering

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Abstract-Laser cutting process is thermal energy based advanced machining process. Due to thermal nature of the process, some defects related to thermal such as heat affected zone, oxide layers and micro-cracks may be observed at the cut edges of laser cut specimens. And also, the thermal conductivity as well as thermal diffusivity of Tialloy is very low, so the temperature is concentrated at the localized area in cut edges. The conventional cutting of Tialloys is difficult due to its properties such as low thermal conductivity, low thermal diffusivity and low elastic modulus. Laser cutting may be used for the cutting of these alloys. In this paper, the temperature distribution during the laser cutting of Ti-alloy sheet has been simulated by using finite element based ANSYS software. For the simulation, moving heat source has been considered. The simulation results show that the maximum temperature is obtained just below the laser beam. As the laser beam moves, there is reduction in the temperature in the moving direction of laser beam. The maximum temperature is found in very narrow area just below to the laser beam due to very low thermal conductivity of Ti-alloys.

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“…In 2003, Chwanhuei T et al [18] studied the crack growth mechanism of CO2 laser cutting alumina ceramics, and used finite element method to simulate and calculate the thermal stress in the process of thermal crack cutting, and the change of thermal stress distribution in the process of thermal crack cutting could explain the crack growth process. In 2006, Shalupaev S et al [19] proposed to adopt two laser beams of different wavelengths to thermal crack cutting brittle nonmetallic materials. Through experimental research, it was concluded that the double beam could effectively control the crack propagation track and improve the cutting quality.…”

Section: Introductionmentioning

confidence: 99%

A novel method by microwave cutting ceramics based on thermal crack and trajectory control

He²,

Xu³

et al. 2023

Int J Adv Manuf Technol

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Herein, microwave thermal crack method is innovatively employed in cutting Al2O3 ceramics.Different from the conventional cutting technology, thermal controlled fracture method is progressive and environmentally friendly, which adopts tensile stress to peel off the brittle material into two parts. The heat source induces tensile stress as thermal stress. Additionally, based on Fourier heat transfer equation and thermo-elasticity, the physical model of microwave thermal crack cutting Al2O3 ceramics is established and calculated. The thickness of the graphite coating, the width of the graphite coating and the prefabricated crack in the process of microwave thermal crack cutting Al2O3 were studied. The effect of graphite coating width on crack trajectory was also investigated by simulation combined with test. From the result, it can be seen that the narrower the width of graphite coating, the weaker the processing ability and the better the trajectory control ability. The microscope is adopted to evaluate the surface and cross section morphologies detailly.This study elaborates briefly the interaction mechanism of microwave thermal crack cutting Al2O3 ceramic surface and provides practical guidance for aerospace industries applications.

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Two-beam laser thermal cleavage of brittle nonmetallic materials

Cited by 19 publications

References 0 publications

Research Progress of Thermal Controlled Cracking of Hard-Brittle Plate

Research Progress of Thermal Controlled Cracking of Hard-Brittle Plate

Modeling and Simulation of Temperature Distribution in Laser Cutting of Ti-Alloy Sheet

A novel method by microwave cutting ceramics based on thermal crack and trajectory control

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