精密機械
Print ISSN : 0374-3543
50 巻, 11 号
選択された号の論文の18件中1~18を表示しています
  • 中沢 弘
    1984 年 50 巻 11 号 p. 1691-1696
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
    植物工場もこうして見てくると,我々精機学会員のやれそうな面白い部分が沢山あることに気付かれたことと思う.私は常日ごろから,我々の工学的なセンスはどのような分野にも有効に活用できるものだと思っている.もちろん最初はその分野の基礎的・常言識的な知識の修得は必要であるが,これはそれほど大変なことではない.農業なら農業のすべての知識は必要ないし,研究対象に関係する知識だけでよいのである.たとえば夏風邪をひいたとすると,医者でない我々はどうしたら早く治るか日ごろの工学的センスを働かせて努力する.いろいろな仮説をたてて薬や漢方を試して,その結果からまた次の手を考える.町医者の通り一遍(?)の処方より,自分で自分の体に合った処方を考え出す方がよっぽど良い場合が多い.我々は保守的にならずにもっと積極的に他分野へ足を踏み入れ,その分野の進歩に協力すべきだと思う.またそんなにかたいこと言わなくても,会員諸兄の研究室でメロンやイチゴが一年中収穫できることを考えても楽しい研究ではないだろうか.
  • 高辻 正基
    1984 年 50 巻 11 号 p. 1697-1701
    発行日: 1984/11/05
    公開日: 2010/02/16
    ジャーナル フリー
  • 三輪 敬之
    1984 年 50 巻 11 号 p. 1702-1708
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
  • 杉山 恒雄
    1984 年 50 巻 11 号 p. 1709-1714
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
  • 橋本 康
    1984 年 50 巻 11 号 p. 1715-1720
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
  • 渡辺 正勝
    1984 年 50 巻 11 号 p. 1721-1728
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
  • 成田 誠之助
    1984 年 50 巻 11 号 p. 1729-1735
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
  • 植田 剛夫
    1984 年 50 巻 11 号 p. 1736-1740
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
  • 鳳 紘一郎
    1984 年 50 巻 11 号 p. 1741-1746
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
  • 長谷川 嘉雄, 花崎 伸作, 錦美 誠
    1984 年 50 巻 11 号 p. 1747-1752
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
    It was experimentally clarified how the wear occurs at a tool cemented the hard grain in a matrix binder such as a cemented carbide tool in cutting GFRP. Cutting two work materials of short glass fiber reinforced polyester resin and of glass beads reinforced polyester resin which contain same content of reinforcements, it was shown that the fibrous glass in resin causes the tool wear characteristic that the tool wear increases with increase of cutting speed over a certain cutting speed in cutting GFRP. Then, GFRP-disk was cut with various kinds of cemented carbides tools. The tool of WC-Co grade wears less than the tool of alloyed WC-Co grade at same volumetric Co-content, and the tool wear increases with increase of Co-content in case of the tool of WC-Co grade. In case of the tool cemented the hard grain in a matrix binder, the tool wear seems to progress due to both the cutting away of the binder and the falling off of the hard grains, so the binder between the grains needs to be thin and its bonding strength needs to be high.
  • 工具摩耗特性と切りくず生成模型
    北川 武揚, 前川 克廣
    1984 年 50 巻 11 号 p. 1753-1758
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
    Wear of carbide tools in turning high manganese steels is examined in comparison with those in turning an austenitic steel and a plain carbon steel. The results obtained are as follows: (1) Although the cutting forces in turning 18% Mn steel are similar to those in turning 18% Cr-Ni steel and 0.46% C steel, the chip contact length is rather short. Large normal stress on the cutting edge and high temperature close to the major cutting edge characterize severe wear at the corner part. (2) The use of tools with large corner radii is effective to improve the tool wear. (3) The experiment proves that the wear characteristics of carbide tools in turning 18% Mn steel and 18% Cr-Ni steel are expressed by the same equation that one of the authors et al. have proposed when machining plain carbon steels. The characteristic constants involved in the wear equation have the same value for the work materials used. (4) A three-dimensional cutting model accompanying with formation of a lateral curl of chip is proposed. The chip shape predicted agrees well with that produced in actual turnings.
  • 加藤 秀雄, 中野 嘉邦, 村上 聡
    1984 年 50 巻 11 号 p. 1759-1764
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
    Two-lobe components or two-point lobings on cross-sectional profiles frequently dominate out-ofroundness of cylindrical workpieces ground by using two dead centers. The present paper deals with these components and a new grindng method to eliminate them. It is shown that two-lobe components are observed as two-cycle-per-revolution runouts of ground surfaces when measured just after grinding from the workpiece table as a datum plane. This fact suggests that two-lobed profiles may result from workpiece rotation errors of twocycle-per-revolution. In the proposed method, the workpiece runouts are corrected by oscillating the wheelhead position precisely by using a special system with a microcomputer and a stepping motor. It is found that, by this method, the two-lobe components and the out-of-roundness of workpieces can be reduced to about one half of the values in conventional methods.
  • 岡村 健二郎, 山品 元, 大野 秀雄
    1984 年 50 巻 11 号 p. 1765-1770
    発行日: 1984/11/05
    公開日: 2010/02/16
    ジャーナル フリー
    This paper deals with the balancing problem of mixed-model flow lines for assembly. After formulating this problem under the constraint that the same work-element for different models must be allocated to the same station, a new heuristic procedure was presented. The procedure consists of three methods, weighing method, backtracking method and insertion-exchange method. A computer program was developed and applied to artificially made 72 problems. The quality of solutions and C. P. U. times were investigated. It revealed that the first two methods always succeeded in minimizing the numbers of stations for all of the problems, and that the 3rd showed significant improvement for the balance of each model. The C. P. U. time of the 1st method was considerably short, and that of the 2nd grew approximately in the order of K2 with the size (K) of work-elements, and in the order of W2 with the size (W) of the mean value of the numbers of work-elements allocated. to a station, while the time of the 3rd showed concave growth with the balance delay.
  • 古川 進
    1984 年 50 巻 11 号 p. 1771-1776
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
    An efficient convex hull algorithm is presented for finite sets of n points in 3-D space. The method is based on the idea of determining the outline loop of a convex polyhedron viewing from a point and connecting the point with each vertex of the outline loop. A convex hull polyhedron can be constructed with O(n) operations, i. e., the processing time is proportional to the number of given points. The algorithm was programmed in FORTRAN language and various computational results were obtained. They guarantee the justice of the theoretical considerations.
  • 斉当 建一, 大川 明宏
    1984 年 50 巻 11 号 p. 1777-1783
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
    The purpose of this paper is to propose a method for prediction of the decreasing with time (relaxation) of initial tightening force in bolted joint with plastics screw. The viscoelastic solution to the relaxation is derived from the elastic one using the CORRESPONDENCE PRINCIPLE. The creep tests are carried out for Poly-Vinyl Chloride (PVC) as an example of viscoelastic materials to decide both the values of the stress to which the CORRESPONDENCE PRINCIPLE can be applied and the viscoelastic models. The viscoelastic solutions are obtained under the assumptions that the bolt and nuts are viscoelastic and clamped parts are rigid. The calculated results are compared with the experimental ones of relaxation for bolted joints with PVC bolt and nuts. The main conclusions are as follows: (1) The value of the stress up to which the behavior of this material can be approximated by the linear viscoelastic model is about 20 MPa at 27°C. (2) Appropriateness of the model for distortion more greatly influences the solution because the change with time of distortion is remarkable in comparison with that of dilatation. (3) Viscoelastic behavior of this material can be expressed by 5-parameter solid model in distortion and 3-parameter in dilatation. (4) The relaxation after tightening can be predicted fairly well, if the viscoelastic models of a material are determined.
  • ジャイロ効果の影響
    竹内 生公, 金田 彰夫
    1984 年 50 巻 11 号 p. 1784-1790
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
    In the present paper, some results of numerical analysis and experiments on the relation among internal damping force, gyroscopic effect and generation of self-excited vibration of rotating shaft system is described. The model used for analysis is a shaft horizontally supported on two ball bearings, with one rotor at the center of its span. The internal damping force and the gyroscopic moment are taken account in equation of motion of the system. Using asymptotic method, the equation for the first approximate solution is derived. Numerical calculation is carried out by Runge-Kutta-Gill's method. The main results obtained are as follows: (1) The characteristic amplitude and phase angle vary depending on the ratio ip of the polar moment of inertia and the moment of inertia of the rotor. (2) With smaller ip, maximum amplitude becomes smaller, and critical speed becomes lower, while the phase angle becomes larger. (3) When the system of rotating shaft has an internal damping force, the smaller the rotor's ip is, speed ratio of stability limit becomes smaller, and the self-excited vibration is apt to occur.
  • 二見 茂, 久良 修郭, 七井 貞明
    1984 年 50 巻 11 号 p. 1791-1797
    発行日: 1984/11/05
    公開日: 2009/06/30
    ジャーナル フリー
    バヅクラッシュを有するサーボ機構の新しい制御方法を提案した.バックラッシュ部のギャップとその速度が計測可能であるとき,
    (1) バヅクラッシュ部で衝突を生じない.
    (2) バックラッシュの存在によらず制御系は安定で,高速応答が実現できる.
    (3) 位置決め精度はバックラッシュの存在とその量に無関係に高精度にできる.
    という特徴を有する制御方法を提案した.
    この制御方法は,
    (1) ギヤップ制御
    (2) 負荷位置制御
    (3) 負荷の駆動方向判定
    (4) 接触状態の判定と制御の切替え
    から構成され,マイクロコンピュータシステムにより実現された.
    実験により提案した制御方法が有効であることを確認した.
    なお,この制御方法の適用限界は,正方向接触/負方向接触の領域が重なり合ってしまう程にバックラッシュ幅が微小な場合,制御の切替えとギャップ制御の整定する時間よりも速く負荷の摩擦や負荷力,あるいは位置指令の方向が変動してしまうような場合,などと考えられる.
  • 池田 進, 矢野 宏
    1984 年 50 巻 11 号 p. 1798-1802
    発行日: 1984/11/05
    公開日: 2010/02/16
    ジャーナル フリー
    測定力の直接的測定法の採用と,測定考のマイクロメータの操作過程の追求から,次のことを明らかにした.
    (1)被測定物にかかる測定力Fとラチェットストップの作動する力FRとは異なる.
    (2)Fは,被測定物に接触する直前のスピンドルの回転速さΩに対し,顕著な1次回帰関係が認められる.その関係は,マイクロメータによって異なる.
    (3)マイクロメータと測定者のΩの変動範囲を考えると,測定力Fは約6~50Nに及ぶ.
    (4)(3)の測定力の変動に対し,フレームの変形量を考慮しただけで,JISの総合誤差の幅を越える.被灘定物の変形も無視できない場合がある.
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