Beaucamp, Anthony

写真a

Affiliation

Faculty of Science and Technology, Department of System Design Engineering (Yagami)

Position

Associate Professor

External Links
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Career 【 Display / hide 】

  • 2015.04
    -
    2023.03

    Kyoto University, Dept. Micro-Engineering, Specially Appointed Associate Professor

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Research Areas 【 Display / hide 】

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering

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Research Keywords 【 Display / hide 】

  • Computer Aided Manufacturing (CAM)

  • Grinding and Polishing

  • Optical Design

  • Optical Fabrication

  • Ultra-Precision Engineering

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Papers 【 Display / hide 】

  • Material removal characteristics in submerged pulsating air jet polishing process

    Han Y., Liu C., Yu M., Jiang L., Zhu W., Qian L., Beaucamp A.

    International Journal of Mechanical Sciences (International Journal of Mechanical Sciences)  257 2023.11

    ISSN  00207403

    　View Summary

    In this paper, the material removal characteristics and mechanism of submerged pulsating air jet polishing (SPAJP) process are investigated by polishing experiment on K9 glass and computational fluid dynamics simulation. The experimental results show SPAJP can etch almost perfect Gaussian footprints with high stability. Under comparable condition, SPAJP achieves nearly 300 times higher material removal rate (3.0 × 10−3 mm3/min) than that of traditional fluid jet polishing (FJP) (9.9 × 10−6 mm3/min) at the cost of a moderate degradation in processed surface roughness from Sa 3.97 nm by FJP to Sa 20.49 nm by SPAJP. Jet evolution, abrasive behavior and material removal mechanism in SPAJP are clarified by numerical modeling and experimental jet observation. It is found that SPAJP relies on jet instability of the submerged airflow beam to entrain and accelerate abrasive particles in the slurry, achieving stable and efficient polishing removal on the workpiece surface. To explore the potential of the process for deterministic polishing, an array structure surface is then designed and polished by SPAJP. The processing results are consistent with numerical prediction results, indicating that the new process has good material removal controllability which makes it applicable to deterministic polishing. This study highlights the possibility of using SPAJP to produce ultra-precise surfaces in terms of form control or fabricate high precision optical components in a more efficient and convenient manner.

  • Feed scheduling for time-dependent machining processes by optimization of bulk removal and NC blocks

    Beaucamp A., Mizoue Y., Yamato S., Sencer B.

    Journal of Materials Processing Technology (Journal of Materials Processing Technology)  312 2023.03

    ISSN  09240136

    　View Summary

    Time-dependent processes such as CNC fluid jet polishing require feed-rate scheduling through deconvolution of a target removal profile and tool influence function. The dynamic constraints associated with the machine tool driving the process should be considered when solving this numerical problem. This research investigates how material bulk removal affects the scheduled feed-rate and acceleration both in the spatial and time domain, and proposes a method for matching exactly the maximum acceleration with the machine tool limit. Furthermore, the influence of CNC interpolator dynamics is investigated by means of the controller pulse response method. An optimization method for NC blocks is then proposed in order to achieve feed-rates that best match the intended profile. The benefit of bulk removal and NC blocks optimization is validated by fabrication, with and without optimization, of cylindrical Fresnel lenses. Both the shape accuracy and optical performance of the optimally fabricated lens are shown to substantially improve, suggesting that the proposed optimization method has strong potential for industrial application.

  • Compliant polishing of thin-walled freeform workpiece

    Zhu W.L., Gao W., Han F., Ju B.F., Chen Y.L., Beaucamp A.

    CIRP Annals (CIRP Annals)  72 ( 1 ) 285 - 288 2023

    ISSN  00078506

    　View Summary

    Compliant polishing using elastic tools can achieve ultraprecision surface quality on freeform workpieces. However, when it comes to thin-walled parts, the challenge arises with the complex polishing mechanics between the tool and freeform surface, without the knowledge of which the surface form can be easily degraded. To address this, an analytical model is established that can predict the interaction mechanics during polishing. On this basis, two adaptive strategies are proposed. Experiments with controllable material removal verify the high accuracy of the model, and compliant polishing of a thin-walled freeform workpiece with highly precise removal consistency below 0.5 µm was achieved.

  • Hybrid tool combining stiff and elastic grinding

    Ashwani Pratap, Shuntaro Yamato, Anthony Beaucamp

    CIRP Annals (Elsevier BV)  72 ( 1 ) 281 - 284 2023

    ISSN  00078506

    　View Summary

    The fabrication process chain for optically smooth surfaces tends to include several time-consuming grinding and polishing steps. To reduce process time, a hybrid tool is proposed in which a stiff grinding tool and a shape adaptive grinding (SAG) tool are fused together, by taking advantage of the elastic nature of SAG tools. The material removal achieved by the hybrid tool is equivalent to discretely using the stiff grinding and SAG tools in sequence. Under similar processing conditions, a smooth surface of ∼0.02 μm Ra can be obtained on BK7 glass with the proposed tool, instead of ∼0.2 μm Ra with the stiff grinding tool.

  • Reverse Engineering Algorithm for Cutting of Ruled Geometries by Wire

    Beaucamp A.T.H., Takeuchi Y.

    International Journal of Automation Technology (International Journal of Automation Technology)  16 ( 3 ) 349 - 355 2022.05

    ISSN  18817629

    　View Summary

    Abrasive wire cutting (AWC) and wire electric discharge machining (WEDM) are efficient and econom-ical processes for the fabrication of precision parts from bulk material. Operating costs and manufacturing lead times are low compared to more general methods such as 5-axis CNC milling, turning, or electro-discharge machining. In this paper, an algorithm based on differential geometry in Euclidean space is proposed for reverse engineering of ruled geometries. The algorithm can determine whether a given geometry is producible by wire cutting, and can also de-rive the associated wire trajectories. Implementation is demonstrated by producing complex turbine blade geometries on 4-axis wire cutting machines with an overall shape accuracy of 20–40 μm peak-to-valley.

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Reviews, Commentaries, etc. 【 Display / hide 】

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • Micro-bubble assisted abrasive waterjet polishing

    2017.04
    -
    2019.03

    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Beaucamp Anthony, Grant-in-Aid for Young Scientists (B), No Setting

    　View Summary

    In fluid jet polishing (FJP), a polishing liquid is pressurized as a jet and and impinges a surface. An improved system consisting of an ultrasonic transducer and acoustic lens mounted atop the FJP nozzle cavity was tested, which boosted material removal rates by up-to 1000%. However, it was not clear whether the removal boost was due to a micro-scale or macro-scale phenomenon.
    A study of micro-pit formation by collapsing micro-bubbles in the near wall region determined that micro-jetting and water hammer pressure do not seem to occur in UFJP, so the micro-scale hypothesis was ruled out.
    A study of workpiece vibrations found that significant shear forces exist at the workpiece surface when ultrasonic vibration is applied to the FJP beam. After theoretical confirmation of the correlation between macro-scale fluid displacement and shear force, the standard erosion model in FJP was modified by adding time-averaged vibration terms. The model and experiments were finally in good agreement.

  • Ultrasonic cavitation assisted fluid jet polishing

    2015.08
    -
    2017.03

    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Beaucamp Anthony, KATSUURA Tomoya, Grant-in-Aid for Research Activity Start-up, No Setting

    　View Summary

    Fluid jet polishing is a versatile process used in super-fine finishing of complex optics and prosthetic joints. Its advantages include highly controllable sub-millimetre polishing footprints and absence of tool wear. But the very low material removal rate means that hard materials such as cemented carbides and super-alloys, used in optical surfaces and prosthetic joints, cannot be polished from a rough condition.
    In this research, we proposed a new method for adding finely controlled micro-bubbles into the slurry jet by ultrasonic cavitation. Acoustic and fluid dynamics simulation confirmed that under the right conditions, cavitation bubbles generated in the nozzle can reach the surface of the workpiece before collapsing. A prototype system was fabricated, and micro-bubbles could be observed at the nozzle outlet using a high-speed camera. Polishing experiments data then showed that micro-bubbles boost removal rate by up-to 380%, without causing any degradation of the surface finish.

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Intellectual Property Rights, etc. 【 Display / hide 】

  • Shaping apparatus, method and tool

    Date applied：   2019.03 

    Date announced： 特開GB/19/04384.3   

    Patent

  • Fluid jet processing

    Date applied：   2018.04 

    Date announced： 特開GB/18/06475.8   

    Patent

  • Method and apparatus for shaping workpieces

    Date applied：   2016.12 

    Date published：   2018.12 

    Date issued： 特許GB/16/21699.6 

    Patent

  • Method for shaping a workpiece

    Date applied：   2014.10 

    Date issued： 特許US/2017/0246728A1  2016.10

    Patent

  • Computer controlled work tool apparatus and method

    Date applied：   2007.08 

    Date issued： 特許GB/0716597.0  2009.08

    Patent

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Awards 【 Display / hide 】

  • F. W. Taylor Medal

    BEAUCAMP, Anthony Tadeus Herve, 2015.08, CIRP (International Academy for Production Engineering), Award for significant contribution to super-fine finishing

  • Excellent paper award

    BEAUCAMP, Anthony Tadeus Herve, 2015.06, Machine Tool Foundation, Shape adaptive grinding of silicon carbide

  • Excellent paper award

    BEAUCAMP, Anthony Tadeus Herve, 2015.05, Mazak Foundation, Shape adaptive grinding of silicon carbide

  • Best Young Scientist Award (Surface Integrity Conference)

    BEAUCAMP, Anthony Tadeus Herve, 2014.05, CIRP (International Academy for Production Engineering), Surface integrity of fluid jet polished surface

  • Excellent paper award

    BEAUCAMP, Anthony Tadeus Herve, 2014.05, Mazak Foundation, Super-fine finishing to 0.3 nm rms

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Courses Taught 【 Display / hide 】

  • SEMINAR IN SYSTEM DESIGN ENGINEERING

    2025

  • MANUFACTURING SYSTEM

    2025

  • LABORATORIES IN SYSTEM DESIGN ENGINEERING 1)

    2025

  • LABORATORIES IN SCIENCE AND TECHNOLOGY

    2025

  • INDEPENDENT STUDY ON INTEGRATED DESIGN ENGINEERING

    2025

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Committee Experiences 【 Display / hide 】

  • 2017.12
    -
    Present

    International Journal of Machine Tools and Manufacture, ASSOCIATE EDITOR

  • 2016.09
    -
    Present

    International Academy for Production Engineering (CIRP), ASSOCIATE MEMBER

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