Machinability study of single-crystal sapphire in a ball-end milling process

Maas, Philipp; Mizumoto, Yuta; Kakinuma, Yasuhiro; Min, Sangkee

doi:10.1007/s12541-017-0013-8

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…Due to the excellent material properties such as high hardness, good light transmittance, high chemical and thermal stability, sapphire has been widely used in high-end technical fields such as communications, electronics, aerospace, optics, and biological engineering [1][2][3][4][5][6]. As a typical anisotropic material, sapphire (α-Al 2 O 3 ) with different crystal planes has different mechanical and optical properties [7].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Sapphire Crystal Orientation on Its Chemical Mechanical Polishing

et al. 2020

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Sapphire has been the most widely used substrate material in LEDs, and the demand for non-C-planes crystal is increasing. In this paper, four crystal planes of the A-, C-, M- and R-plane were selected as the research objects. Nanoindentation technology and chemical mechanical polishing technology were used to study the effect of anisotropy on material properties and processing results. The consequence showed that the C-plane was the easiest crystal plane to process with the material removal rate of 5.93 nm/min, while the R-plane was the most difficult with the material removal rate of 2.47 nm/min. Moreover, the research results have great guiding significance for the processing of sapphire with different crystal orientations.

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Section: Introductionmentioning

confidence: 99%

Study on the Influence of Sapphire Crystal Orientation on Its Chemical Mechanical Polishing

et al. 2020

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“…In fact, it is a common phenomenon that local cracks appear on the surface or inside of the specimen during the precision machining of SCS. [17][18][19][20] Numerous scholars have also carried out extensive research on the mechanism of SCS crack generation. Gu et al [21] performed a single scratch test on C-plane sapphire and found that the initial radial crack was a type-II crack, which nucleated at the dislocation accumulation and propagated on the twin planes R1 and R2.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, it is a common phenomenon that local cracks appear on the surface or inside of the specimen during the precision machining of SCS. [ 17–20 ] Numerous scholars have also carried out extensive research on the mechanism of SCS crack generation. Gu et al.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Dynamic Impact Mechanism of Single Crystal Sapphire 3D Model Based on Cohesive Zone Law

Wang

2023

Cryst. Res. Technol.

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Based on mesh reconstruction technology, a 3D solid model of single crystal sapphire (SCS) with global embedded cohesive element is established in this study. Using exponential cohesive zone law (CZL), the anisotropy of SCS can be effectively characterized by assigning the mechanical properties of matrix element and cohesive element. Taking the C‐plane SCS model as the research object, the whole process of dynamic evolution of cracks in the model under high‐speed surface impact and high concentrated stress impact is reproduced by finite element simulation technology. The simulation is compared with the experimental results from the aspects of crack initiation morphology, crack propagation path, sample fragmentation form, and mechanical response curve. The dynamic compressive strength reaches 1630.3 MPa with the impact velocity of 30 m s–1 in surface impact type. The initial maximum loading force reaches 320 N when the impact velocity is 8.35 m s–1 in the indentation impact type. In addition, by combining the simulation results, this study clarifies the mechanism of strain rate effect exhibited by SCS from the perspective of stress–strain data and crack evolution characteristics. Therefore, the model established in this study can effectively reflect the mechanical behavior of SCS under impact load.

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“…Rotary multi-cutter device manufactured by Wu et al was used to cut stainless steel wire ropes (2015). There are also many straight cutting tools (Kaselouris et al, 2017), and their shapes of these tools are different, such as polyhedron (Menezes et al, 2014), spherical (Maas et al, 2017), cylindrical (Lu et al, 2017). In addition, unused materials are stripped differently, for example, brushes are used to peel cassava tubers by Barati et al (2019), peeling rollers are used on citrus (Pan et al, 2015), and the principle of friction is also used in a kolanut peeling device (Kareem et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Cutter design and multi-objective optimization of machine for cable peeling

Shi¹,

Zhu

Zhao³

et al. 2020

JAMDSM

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Cutter design and multi-objective optimization of machine for cable peeling is proposed to use mechanical peeling instead of manual peeling in this paper. First, the design of the machine for cable peeling includes executive mechanism, driving part for cable, driving part for executive mechanism, and peeling mechanism. Then, the cutting experiment platform is set up to verify the actual effect of cutting, and different cutting depths, cutting speeds and fixing cables methods are discussed by the cutting experiment platform. A numerical simulation method is proposed, and different cutting methods, cutting depths and cutting speeds for cutting different materials are discussed by simulation method. The results show that simultaneous cutting is better than sequential cutting. The results show a good agreement between the results obtained from the finite element modelling and experimental investigations. A theoretical reference is provided for subsequent structural improvement. Finally, multi-objective optimization of machine for cable peeling is realized. The aim of the optimization was improving the dimensional accuracy after cutting and reducing the deformation of the cut surface. Cutter thickness, cutter angle, and cutter material are used as optimization variables, and the final optimal solution is obtained. The cutter is manufactured according to the final optimal solution, experiment of cutting is performed, and good agreements were achieved between optimal solution and experiments. Comparing the final results with the initial results shows a significant improvement.

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Machinability study of single-crystal sapphire in a ball-end milling process

Cited by 8 publications

References 19 publications

Study on the Influence of Sapphire Crystal Orientation on Its Chemical Mechanical Polishing

Study on the Influence of Sapphire Crystal Orientation on Its Chemical Mechanical Polishing

Investigation on Dynamic Impact Mechanism of Single Crystal Sapphire 3D Model Based on Cohesive Zone Law

Cutter design and multi-objective optimization of machine for cable peeling

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