巻号一覧
61 巻, 5 号
May
選択された号の論文の9件中1～9を表示しています
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企画セッション：積層造形技術
総報
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藤川 隆男2014 年 61 巻 5 号 p. 216-
発行日: 2014/05/15
公開日: 2014/08/05
ジャーナル オープンアクセスPDF形式でダウンロード (109K)
解説
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前田 寿彦2014 年 61 巻 5 号 p. 217-222
発行日: 2014/05/15
公開日: 2014/08/05
ジャーナル オープンアクセス3D printing is drawing great interest as an innovative manufacturing tool which can produce tailor-made parts or high functional parts. However, it seems that real status of 3D printing or additive manufacturing is not understood correctly. This article gives an overview of the positioning of each 3D printing technology in additive manufacturing and shows examples of additive manufacturing by using laser sintering technology. Especially, the latest case studies of metal parts will be shown.抄録全体を表示PDF形式でダウンロード (1165K) -
萩原 正, 堀場 欣紀, 佐々 雅祥, 中野 禅, 清水 透, 松崎 邦男, 佐藤 直子2014 年 61 巻 5 号 p. 223-226
発行日: 2014/05/15
公開日: 2014/08/05
ジャーナル オープンアクセスAspect Inc. and AIST (National Institute of Advanced Industrial Science and Technology), as a member of ALPROT, which stands for Advanced Laser and Process Technology Research Association, have developed two types of unprecedented Selective Laser Melting platform with a high vacuum built process chamber and a new developed QCW (quasi continuous wave) laser system in the national project, which started from 2010 and conducted by NEDO (New Energy and Industrial Technology Development Organization). In this report, the development status of the Selective Laser Melting platform is mainly introduced.抄録全体を表示PDF形式でダウンロード (1554K) -
安達 充, 小岩井 修二, 小岩井 豊己2014 年 61 巻 5 号 p. 227-233
発行日: 2014/05/15
公開日: 2014/08/05
ジャーナル オープンアクセスThe present study was undertaken to investigate the mechanical properties, surface toughness, accuracy of dimension and corrosion resistance of Ti–6Al–4V alloy prepared by additive manufacturing method using electron beam as the energy sauce. A product having good internal quality, surface quality is provided by choosing current conditions of the electron beam appropriately. The mechanical properties are a rolling product level without heat treatment.
If there are even metal powder and 3D data by using the additive manufacturing method, this method can produce complicated products and the superior characteristics like statement above without a mold. However, the manufacturing cost is higher by from 10 times to 100 times than the conventional manufacturing processes. Therefore, the mechanical property, physical property, shape and product cost has to be taken into consideration for a product enough when we choose this additive manufacturing method.抄録全体を表示PDF形式でダウンロード (1334K)
研究論文
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Shi-Hai SUN, Yuichiro KOIZUMI, Shingo KUROSU , Yun-Ping LI, Akihiko CH ...2014 年 61 巻 5 号 p. 234-242
発行日: 2014/05/15
公開日: 2014/08/05
ジャーナル オープンアクセスHigh temperature tensile property and phase transformation of Co–28Cr–6Mo–0.23C–0.17N alloy rods fabricated by electron-beam melting (EBM) with cylinder axes along build direction was investigated. Single-crystal like γ – fcc grain structure can be obtained by EBM. Although constituent phase varied along the build direction in the as – EBM – built rod, from single ε – hcp phase in the bottom to single γ – fcc phase in the top, γ – fcc phase can be kept in a wide range of build height, i.e. about 40 mm from the top finishing plane. ε – hcp grains in the bottom of the rods obtained in the EBM process mostly had preferential orientations. The rods can be transformed into single ε – hcp phase by the aging treatment at 800 ˚C for 24 h, and ε – hcp phase in the top of the rods obtained by aging heat treatment exhibited diffusion transformation. The yield strength and ultimate tensile strength (UTS) of the top part was higher than that of the bottom part, though the plastic elongation of the top part was a little lower than that of the bottom part.抄録全体を表示PDF形式でダウンロード (1835K) -
小泉 雄一郎, 孫 世海, 齋藤 毅, 黒須 信吾, 千葉 晶彦2014 年 61 巻 5 号 p. 243-249
発行日: 2014/05/15
公開日: 2014/08/05
ジャーナル オープンアクセスFlat spiral spring (i.e. coils of metal ribbon such as clock-mainsprings) can store elastic strain energy and release the energy as kinetic energy on demand. Recently, devices to generate electricity from the elastic strain energy are attracting attention as energy saving tools and emergency power source. However, a higher energy density and downsizing are necessary for practical use. In the present study, the electron beam melting (EBM) has been applied to Co–Cr–Mo alloy, which has a potential ability to store approximately 30 % higher elastic strain energy than the currently best material, in order to maximize its Young’s modulus by controlling the crystal orientation texture. A high Young’s modulus of 275 GPa and a high strength of 1.2 GPa have been achieved with a rod by selecting its longitudinal axis parallel to the space diagonal of the space defined by the x– and y– scanning direction of electron beam and the z–build direction. The mechanical property of the rod is very attractive for a high energy-density clock-mainspring material. Moreover, the single-pieced fabrication of a spring-shaft-balance disk unit was tested, and the surface-smoothing and the control of local crystal texture during the EBM process have been emerged as necessary challenges.抄録全体を表示PDF形式でダウンロード (2200K) -
唐土 庄太郎, 増尾 大慈, 矢倉 孟, 山本 泰弘2014 年 61 巻 5 号 p. 250-254
発行日: 2014/05/15
公開日: 2014/08/05
ジャーナル オープンアクセスIn this study, on the premise of adding HIP treatment, two typical additive manufacturing methods, the Electron Beam method and the Fiber Laser method, are selected to evaluate their performance and the properties of the resultant test pieces. Ti–6Al–4V alloy powders were used for the starting material. As-built test pieces and HIPed test pieces were evaluated in terms of density, mechanical properties such as tensile and fatigue strength, cross-sectional photographs, and metallographic observation. The differences in performance between the two manufacturing methods were confirmed, especially for the Ti–6Al–4V material. From these results, no significant difference with superior mechanical properties was found in the two typical additive manufacturing methods. Furthermore, by applying the HIP treatment, significant improvements in mechanical properties were confirmed.抄録全体を表示PDF形式でダウンロード (1608K) -
津守 不二夫, 長谷川 修, 長田 稔子, 三浦 秀士2014 年 61 巻 5 号 p. 255-261
発行日: 2014/05/15
公開日: 2014/08/05
ジャーナル オープンアクセスThis study aims at combining the laser micro machining technology with the powder metallurgy process for fabricating the ceramic sheets with a fine pattern on the surface. The ceramic sheets were so fragile after sintering that a compound material, a mixture of ceramic powder and polymer, was prepared for laser machining, followed by debinding and sintering. Yttria stabilized zirconia (YSZ) was employed as a starting material, considering that the obtained sheet could be applied for the electrolyte layer of the solid oxide fuel cell. Polyvinyl alcohol was also prepared as polymer binder for aqueous solution. The compound sheets were formed by laser irradiation varying such laser conditions as laser power and frequency to investigate the effect of the laser irradiation on the depth and width of the pattern. The laser-machined compound sheets were successfully debound and sintered, and dense ceramic sheets were finally obtained.抄録全体を表示PDF形式でダウンロード (1535K)
本会記事
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2014 年 61 巻 5 号 p. Pref5_1-
発行日: 2014/05/15
公開日: 2014/08/05
ジャーナル オープンアクセスPDF形式でダウンロード (997K)
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