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Machining of Metals
Published in Sherif D. El Wakil, Processes and Design for Manufacturing, 2019
In a reciprocating saw, a relatively large hacksaw blade is mechanically reciprocated. Depending upon the construction of the saw, the cutting blade may be either horizontal or vertical. Each cycle has a working (cutting) stroke as well as an idle stroke. Consequently, this type of saw is considered to be a low-productivity saw and is used only in small shops with low-to-moderate production volume.
Automated maxillofacial reconstruction software: development and evaluation
Published in Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization, 2020
Hannah Kim, Tae-Geun Son, Hyunchul Cho, Eungjune Shim, Bo-Yeon Hwang, Jung-Woo Lee, Youngjun Kim
Based on the virtual surgical planning results, patient-specific guides for the osteotomy are designed. The guide is composed of three parts: a guide panel, sawing rails, and screw holes. Three-dimensional printed guide models are affixed with screws to the bone, and the rail supports the surgical reciprocating saw during the osteotomy. The osteotomy guide is designed on the original mandible and the fibula based on the defined resection planes. There is not a significant difference between the procedures for the mandible resection guide and the fibula guide.
Development and validation of an agglomeration model for CFD simulations of aerosol dispersion in the frame of Fukushima fuel debris retrieval
Published in Journal of Nuclear Science and Technology, 2021
Thomas Gélain, Emmanuel Porcheron, Christophe Chagnot, Ioana Doyen, Christophe Journeau, Damien Roulet
In addition, the laser cutting technique induces the lowest material mass removed and the lowest mass of re-suspended aerosol during the cutting, comparatively to other cutting techniques (grinder, plasma torch, arc air, arc saw, reciprocating saw) [1]. In addition to the study of the technical aspects regarding the capability of the cutting tool to be deployed in hostile conditions such as a radiating environment, the risk of the corium retrieval operations has to be evaluated to limit the radionuclide dissemination outside the containment vessel.
Fukushima Daiichi fuel debris retrieval: results of aerosol characterization during laser cutting of non-radioactive corium simulants
Published in Journal of Nuclear Science and Technology, 2021
Emmanuel Porcheron, Claire Dazon, Thomas Gelain, Christophe Chagnot, Ioana Doyen, Christophe Journeau, Emmanuel Excoffier, Damien Roulet
Laser cutting [1] has many potential advantages for the retrieval of corium, as compared with the alternative techniques, such as grinding, plasma torch, arc air, arc saw or reciprocating saw cutting [2], since it is well suited to cutting dense materials of irregular geometry, while minimizing the extraction of excess mass, and, significantly, minimizing the volatilization of contaminants in aerosols. Detailed studies on aerosols generation during cutting processes of activated metals by various tools have been performed by authors [3–5] underlining the influence of each cutting tool and its associated tuning, the chemical composition of cutting materials and also the environment conditions of the dismantling operations, such as air or underwater conditions. Among the advantages brought by the laser cutting technology, one can highlight the remote-controlled non-contact process, which removes the risk of tool blocking. The laser is also able to cut a variety of material structures, with different chemical compositions including the less homogeneous ones, and complex geometries [1,6]. The laser also delivers high throughput power at large operating distances and requires a minimum of operators working with it. Moreover, the laser cutting technique induces the lowest material mass removed and the lowest mass of re-suspended aerosol during cutting, comparatively to other cutting techniques (grinder, plasma torch, arc air, arc saw, reciprocating saw) [2]. In addition to the aptitude of each cutting technique for corium retrieval operations in highly radioactive environments, the risk of the corium retrieval operations must be addressed to limit radionuclides dissemination outside the containment vessel. In this view, the characterization of the aerosol source term released during laser cutting of the fuel debris is critical to evaluating the aerosol dispersion into the environment. The size distribution and the morphology of particles released during cutting are equally significant when predicting their transport and deposition through numerical simulations. Furthermore, quantitative characterization of the contaminated aerosols is essential to develop and optimize technologies to capture and contain particulate pollutants, mitigating against environmental contamination and human exposure.