精密機械
Print ISSN : 0374-3543
21 巻, 246 号
選択された号の論文の7件中1~7を表示しています
  • 青木 保雄
    1955 年 21 巻 246 号 p. 331-336
    発行日: 1955/08/05
    公開日: 2010/02/16
    ジャーナル フリー
  • 吉田 邦彦, 芹沢 喬, 戸井田 数男
    1955 年 21 巻 246 号 p. 337-340
    発行日: 1955/08/05
    公開日: 2010/02/16
    ジャーナル フリー
    The effect of carbide tool form on the basic variables of cutting process, especially that on the cutting force is a subject of importance for the practical operations. In this report, we showed the relationship between the effective rake angles calculated for various tool forms and the corresponding cutting forces actually measured. As an application example of the results, a tool form with negative back rake angle for intermittent turning was designed and proved to be useful by experiments.
  • 吉本 源之助, 築添 正, 菊池 進
    1955 年 21 巻 246 号 p. 341-345
    発行日: 1955/08/05
    公開日: 2009/06/30
    ジャーナル フリー
    The electrical resistance between two surfaces of metals in contact consists of the spreading resistance and the film resistance. In order to measure the real area of ontact between nominally flat surfaces by electrical resistance method, it is necessary to find this film resistance. This paper describes an attempt on the estimation of the film resistance by electrical means, and some discussions about behaviors of the film resistance by dividing the surface film into two parts : a chemically produced layer of oxide and physically absorbed layer of contaminations.
  • 大島 康次郎
    1955 年 21 巻 246 号 p. 345-352
    発行日: 1955/08/05
    公開日: 2009/06/30
    ジャーナル フリー
    In this report, in succession to the preceding one, the results of experiments as for the non-linearity of watch hairsprings are described.
    These are as follows :
    1) The effect of the strain at the curb-pins and the stud is inverted in accordance with the direction of the hairspring eccentricity.
    2) The effect of the eccentricity and the strain is almost the same regardless of the hairspring material.
    3) The adjustment in which the escapement error is compensated by the non-linearity of the hairspring, is possible.
    4) As for Breguet springs, the variation of the periodic time according to the decrease of the amplitude shows the gain regardless of the spiral angle and the direction of the eccentricity ; the effect of the strain is inverted in accordance with the direction of the eccentricity ; and the small change of the form of the terminal curve does hardly affect the variation of the periodic time.
  • 中山 一雄
    1955 年 21 巻 246 号 p. 353-356
    発行日: 1955/08/05
    公開日: 2010/02/16
    ジャーナル フリー
    被削材を炉中で加熱し乍ら二次元切削した以上の実験から得られた主な結果は以下の如くである.
    1.切削抵抗は一般に被削材温度の上昇に伴つて単調に減少する.その原因は被削材の降伏剪断応力の低下が主であるが,剪断角の増大も原因している.
    2.炭素鋼の如き耐熱性の低い材料を極く低速で切削する場合には,500℃以上に加熱すると剪断角が減少し且つ被削材が押しつぶされて切削幅も増加する為に切削抵抗は増大する.
    3.クロムモリブデン鋼では温度上昇に伴う切削抵抗の減少率は炭素鋼より少い.
    4.切削の形状は被削材の伸びと密接な関係を有し,青色脆性及び二次脆性を示す温度では切削の連続性が低下し,それに伴つて仕上面も粗くなる.
    5.600℃附近削加熱するとすくい角-10°の鈍角バイトを用いて極めて低速で削つても1μ程度の非常に平滑な面が得られる.之は高温の為に構成刄先が消滅する為と考えられる.
    6.切削速度が増せば切削熱による温度上昇が増大するから,より低い被削材温度でも前項の平滑面が得られる.
    7.被削材温度が上昇すると切削抵抗におけるSize Effectは減少する
  • 置注ぎ並びに遠心鋳造法について
    小川 喜代一, 竹内 栄一
    1955 年 21 巻 246 号 p. 356-359
    発行日: 1955/08/05
    公開日: 2009/06/30
    ジャーナル フリー
    Fundamental studies were made on the abrasion phenomena of cylinder liner and of piston ring. Both of static sand and centrifugal casting iron were chosen as the specimens of lubricating and slip abrasion tests. According to the examinations, the stable range of abrasion was known as 30kg/cm2, 105m/sec. And in this condition, abrasion resistance was larger in centrifugal casting iron. However, by annealing at the optimum temperature after casting, abrasion resistance was greatly improved, and difference could not be found between the two casting methods.
  • 1955 年 21 巻 246 号 p. 368-370
    発行日: 1955/08/05
    公開日: 2009/06/30
    ジャーナル フリー
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