精密機械
Print ISSN : 0374-3543
23 巻, 274 号
選択された号の論文の8件中1~8を表示しています
  • 葉山 房夫
    1957 年 23 巻 274 号 p. 561-567
    発行日: 1957/12/05
    公開日: 2009/06/30
    ジャーナル フリー
  • 振巾拡大具の先端に集中質量がついた場合
    津枝 正介, 斎藤 長男
    1957 年 23 巻 274 号 p. 568-573
    発行日: 1957/12/05
    公開日: 2010/02/16
    ジャーナル フリー
    An analysis of the longitudinal oscillation of both conical and exponential horns as used in supersonic machining shows that their amplification factors become maximum when adequate concentrated masses, like tools, are attached to their ends.
    In both cases, the greater the ratio of the radii (√S0/Sl) the greater the maximum amplification factor.
    For the same value of (√S0/Sl) the the amplification factor of conical horn is smaller than that of an exponential horn, but in the former case, larger concentrated mass can be attached to its end.
  • 大越 諄, 飯田 喜介
    1957 年 23 巻 274 号 p. 573-575
    発行日: 1957/12/05
    公開日: 2010/02/16
    ジャーナル フリー
    Impact actions of sphere collided with semi-infinite elastic and plastic body were analysed. Force and deformation due to impact were presented as the function of diameter (D) and velocity (ν) of sphere and material factors.
    The differences between the analytical results and the experimental formulas reported previously were compared by the exponents on diameter and velocity of sphere. The results are shown in table 1.
    For the impact force of sphere, diameter effect in the elastic impact is equal to that in the plastic impact, but velocity effect in the former is larger than that in the latter. The experimental result on diameter effect is all but the same to them, and that on velocity effect is the middle of them.
    For deformation, which involves chordal diameter, depth and volume of indentation, diameter effect in the plastic impact is equal to that in the elastic impact, but velocity effect in the former is a little larger than that in the latter. Theoritical results of the plastic impact are identical with the experimental results.
  • -切削剤の冷却効果に関する研究(7)-
    山本 明
    1957 年 23 巻 274 号 p. 576-580
    発行日: 1957/12/05
    公開日: 2009/06/30
    ジャーナル フリー
    前報 (切削剤を用いた金属切削における刀先滅度の計算) の5.計算例において, 勢断面温度の刃先温度に及ぼす影響は大ぎく, その勇断面温度は連続切削の場合, 加工物に流入し表面近くに留まつている熱量によつて生ずる加工物表皮の温度上昇によつて高められているので, 加工物の冷却はゆるがせに出来ないことをのべた。本報では, まず, 加工物を冷却したときの表皮の湿度上昇を求めたのち, その冷却程度が匁先温度に及ぼす影響を考察する。
    いま, 定常切削状態において, 切削個所から加工物に流入する熱量をQcal/cm2sとする。普通の流下式の場合, 切屑と工具を冷却したのちの幾らかの量が加工物にそつて流れるにすぎず, 切削点以下1/4周が冷却されるのが普通である。よつてその冷却効果は相対表面熱伝達率hと熱流入聞隔t0 (とくに旋削では回転数N) に関係することは容易に想像がつく。しかし, (a) 切削液の拡つた部分であるうえに切屑, 工具に邪魔されるため, 切暦におけるよりも, 加工物単位表而積当りの吸熱に与る液量が少いこと, (b) さらにこの液体量は相対速度のうえから切削速度が早くなるほど少いこと, によつてそれぞれhが非常に小さな値になることに注意しなければならぬ。
    1.2次元連続切削において冷却能hで加工物が冷却されるとぎ, 加工物表皮の温度上昇を階差法によつて求めた。その結果は式 (10) で与えられる。
    2.現在使用されている切削剤・沖油法の冷却状態如何は, 丁度常川速度で大いにその冷却効果を異にする。
    3.加工物冷却効果は, 勇断面温度の低下となつて刄先温度を下げる。これは低速軽切削で著しい。 (図6)
    4.普通に行われる3つの冷却の場rrを仮定し (表2) それぞれの刄先温度低下効果を考察した。 (図7)
  • 1957 年 23 巻 274 号 p. 580
    発行日: 1957年
    公開日: 2010/11/19
    ジャーナル フリー
  • 鋳鉄切削の場合
    竹山 秀彦
    1957 年 23 巻 274 号 p. 581-585
    発行日: 1957/12/05
    公開日: 2010/02/16
    ジャーナル フリー
    Metal working shops in our country also must consider production applications of ceramic cutting tool materials, because in some foreign countries ceramics for this purpose have already found successful application in production set-ups. However, in our country, either its industrial application or the production of ceramic materials has been still very backward.
    The purpose of this test is for quicker practical applications of home made ceramic tools and also for analysing the wear process of a ceramic cutting tool material, type B ceramic, produced by way of experiment. The test result has revealed that type B ceramic tool can cut Meehanite cast iron 2.5 times as fast as one of the best carbide tools under shop conditions. The economical machining conditions with type B ceramic tools have been investigated at the same time. One must bear in mind that the primary problem to improve the quality of ceramic tools is to prevent the cutting edges from chipping of either a largeor small scale.
  • 井田 一郎, 新井 湧三
    1957 年 23 巻 274 号 p. 585-591
    発行日: 1957/12/05
    公開日: 2009/06/30
    ジャーナル フリー
    The design and experiments on spherical lapping of both bulb and stem for electronic tubes, which are to be used in submarine cable amplifiers, are described here.
    The results which are considered to be applicable for obtaining the good contact between bulb and stem are as follows :
    (1) Works can be spherically-lapped with spherical zone-shaped ebonite laps and with a universal holder.
    (2) Through all three stages, the same combination of laps should be used, and works can be polished precisely, even without pitch-made polishers, causing no serious scratches on glass surfaces.
    (3) When the stem is lapped, the concave lap is positioned on the stem, and when the concave lap is Mapped with the convex one, the concave one is positioned under the convex one. By this reversal of the position, the reproducible contact between bulb and stem with high accuracy is expected.
  • 1957 年 23 巻 274 号 p. 595-597
    発行日: 1957/12/05
    公開日: 2009/06/30
    ジャーナル フリー
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