著者

長野 心太 久保田 良浩 高岸 智子 篠塚 淳 青木 昭和

出版者

日本臨床外科学会

雑誌

日本臨床外科学会雑誌 (ISSN:13452843)

巻号頁・発行日

vol.81, no.7, pp.1324-1328, 2020 (Released:2021-01-31)

参考文献数

22

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妊娠27週5日の32歳,女性.心窩部痛と嘔吐を主訴に救急搬送された.腹部単純CTで中腸軸捻が疑われたため新生児科医および産科医の立ち会いのもと,緊急手術を施行した.Treitz靱帯の形成はなく,上腸間膜動脈を中心として小腸・盲腸・上行結腸が時計回りに360°軸捻転していたため,腸回転異常症に伴う中腸軸捻と診断し,捻転を解除した.腸管の虚血性変化は軽度で腸管切除は要さなかった.術後は一過性に子宮収縮を認めたものの,経過良好で術後9日目に退院となった.妊娠中に生じる中腸軸捻の報告は非常に少なく,国内では2例目である.母児ともに予後良好に治療しえたので報告する.

著者

篠塚 淳

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.78, no.3, pp.233-240, 2007-07-26 (Released:2008-01-26)

参考文献数

26

被引用文献数

1 1

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Recent remarkable advancement of computer performances made possible a metal cutting simulation with finite element analysis. Nowadays, commercial 3D-FEA software specialized in machining processes, such as turning, milling and drilling, is available. This review focuses on a predictability of FEM cutting simulations. Detailed material properties, such as flow stress under high stain rates and high temperatures conditions, friction at tool-chip contact region, thermal conductivity and heat capacity, are indispensable to simulate a metal cutting process in detail. Flow stress characteristics proposed so far, a nonlinear friction property at the tool-chip contact region and equations to estimate tool wear and tool breakage are presented. A prediction of chip controllability with a FEA is shown. Next, a dynamic thermo elasto-plastic FEM cutting simulation is shown. Deformations and temperatures were solved explicitly in the FEA. A penalty force and a correction heat flux that can be adapted to a wide range of cutting condition were considered at the tool-chip contact region in the FEA. Finally, some results of the FEA under ultra high-speed cutting conditions that cutting speed exceeds the plastic wave speeds of a workpiece material are shown as one of examples indicating high predictability of the FEA.

著者

篠塚 淳 内海 幸治 Ali Basti 帯川 利之

出版者

一般社団法人日本機械学会

雑誌

生産加工・工作機械部門講演会 : 生産と加工に関する学術講演会

巻号頁・発行日

vol.2004, no.5, pp.251-252, 2004-11-19

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New type of intelligent cutting tool with built-in thin film thermocouples (TFTs) was proposed. This cutting tool has many minute temperature sensors to measure the temperature distribution on the tool rake face directly. In this study, three types of cutting tools with built-in TFTs were developed. TFTs composed of Nickel and Nickel-Chrome thin films were fabricated on the rake face of the Alumina cutting insert by DC magnetron sputtering. Then Hafnium oxide film was deposited on the TFTs to insulate electrically. Finally Titanium nitride film was coated to endure cutting situation. Appropriate temperature distributions on the tool rake face including tool-chip contact area were measured by the cutting temperature experiments.