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後続誌
35 巻, 417 号
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宮本 博1969 年 35 巻 417 号 p. 609-623
発行日: 1969年
公開日: 2010/02/16
ジャーナル フリーPDF形式でダウンロード (1630K) -
古市 博, 高橋 昇1969 年 35 巻 417 号 p. 624-628
発行日: 1969年
公開日: 2010/02/16
ジャーナル フリーDislocation arrangement of a weared or a super-finished surface in α-brass has been observed using an etch pit method.
The main results are as follows : -
(1) The density of dislocations varies from crystal to crystal and from matrix to twin in a weared or super-finished surface.
In some places no dislocation etch pit could be observed in spite of the fact that scratches were observed everywhere on the surface.
(2) The bands of dislocation etch pits were observed on a weared or a super-finished surface, where scratches were observed all over the surface.
These (1) and (2) may indicate that friction consists of softening, and shearing fracture after sticking or ploughing, respectively.
(3) Sometimes, cracks which started from non-metallic inclusion were observed.
(4) Grain boundary migration was observed on super-finished specimens.抄録全体を表示PDF形式でダウンロード (1808K) -
竹山 秀彦, 宮坂 金佳1969 年 35 巻 417 号 p. 629-633
発行日: 1969年
公開日: 2009/06/30
ジャーナル フリー以上のような実験結果からつぎのことが明らかになった.
(1) 工具摩耗の中で切削仕上面あらさに最も影響をおよぼすのは前切れ刃に生ずる境界摩耗であり, 同摩耗長さとにげ面摩耗幅との差 (V'BE-VBE) が問題になる.
(2) 切削開始後しばらくして仕上面あらさの極大値が現われるのは切削開始後急速に進行した境界摩耗が一時停滞し, 逆ににげ面摩耗の進行速度が増して境界摩耗に追いつくためである.
(3) 境界摩耗防止策として工具の前切れ刃角をかえてもあまり効果は期待できない.しかし前切れ刃角0°にすれば仕上面は多少改善されるがこれも決定的な解決策ではない.
(4) 上すくい角を大きくしても仕上面あらさは改善されず, かえって悪くなる.
(5) 可変送り切削方式は被削材S45C, SUS27についてその効果が認められる.また送り変化のパターンをさらに工夫することにより境界摩耗対策としてより効果が期待できそうである.
なお, 今後は境界摩耗の発生原因を調べ, さらに効果的な境界摩耗対策を考えていきたい.抄録全体を表示PDF形式でダウンロード (724K) -
強さにおよぼす表面あらさおよび焼鈍の影響古川 満彦, 小川 一樹, 杉田 忠彰1969 年 35 巻 417 号 p. 634-642
発行日: 1969年
公開日: 2009/06/30
ジャーナル フリーThis study was attempted to determine the effects of the annealing treatment and of the surface roughness on bending rupture strength of the sintered alumina. The specimens were fabricated by hot pressing. Hot pressing of 99. 5% Al2O3, 0.5% MgO was carried out at the temperature range from 1400 to 1500°C for 1 hour. The results obtained in this work are as follows.
(1) The bending rupture strength for the ground specimen is markedly reduced by surface flaws produced with surface finishing. This unfavourable damage, however, disappears with annealing at higher temperature than 1000°C.
(2) When the specimen is annealed, the scattering of the strength becomes smaller than that of the unannealed specimen. The scattering of the strength begins to reduce from annealing temperature of 1000°C in the case of 1 hour annealing for ground specimen.
(3) By the annealing treatment the geometry of grinding marking and other surface micro flaws are considerably changed. Grinding flaws begin to become smooth by annealing at 900°C for 1 hour and they disappear by annealing at 1500°C for 1 hour. The grain shape begins to be changed at 1200°C. However the large drop of the strength does not occur even after the annealing at 1500°C where grain grouth is slightly observed.抄録全体を表示PDF形式でダウンロード (3657K) -
萱場 孝雄, 鈴木 忠一郎, 野口 行雄1969 年 35 巻 417 号 p. 643-648
発行日: 1969年
公開日: 2009/06/30
ジャーナル フリーIn this paper, the radial movements of the pressed cages of deep groove single row radial ball bearings were examined by the optical locus of cage center, and the relations between the amplitude of the movements of center and the various conditions with some lubricants were derived.
Then the following conclusions were drawn :
(1) Under the usual lubricating conditions, the forces acted impulsively between the balls and the cage with the rise in revolution. Therefore, the recorded figure became of ruggedness. Especially it has been observed that the movements of cages were influenced by the vibration of balls in the direction of cage rotation on the shaft speed of 40005000 rpm.
(2) The viscosity of lubricants, or their temperature characteristics, affected very much to the amplitude of cage center.
(3) Under the thrust load, the radial movements of the cage center were very small.抄録全体を表示PDF形式でダウンロード (1068K) -
西村 源六郎, 久岡 基良1969 年 35 巻 417 号 p. 649-655
発行日: 1969年
公開日: 2009/06/30
ジャーナル フリーConcerning the machining mechanism of ultrasonic mechanical machining, the theory of stationary vibration of an elastic bar is studied for the case when the bar is collided with a rigid body supported by the action of static pressure to obtain the displacement U of the tip of the bar facing the rigid body. The theory, moreover, gives the impulsive force Ft=t1 induced at the instant when the bar collides with the rigid body. Investigating the characteristics of U and Ft=t1, it is ascertained that the theoretical dispositions of these quantities are reasonable and well-founded by the experimental results obtained when the stationary ultrasonic vibration of collision between the tool of mild steel and the work of glass plate is performed by using an apparatus of ultrasonic mechanical machining of frequency of 21.5 kc/s.
Further, under the acceptable conception that the action of the displacement U is the root of the pumping action of the ultrasonic mechanical machining and that of the impulsive force Ft=t1 causes the hammering action of it, the theoretical characteristic of the product of U and Ft=t1 is studied to obtain the theoretical matters favourable for certain to explain the experimental fact concerning the characteristics of the machining rate of the ultrasonic mechanical machining which has a special response to the variation of the static pressure.抄録全体を表示PDF形式でダウンロード (1083K) -
1969 年 35 巻 417 号 p. 655
発行日: 1969年
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (129K) -
速度方向逃げ角と逃げ面摩耗賀勢 晋, 原 利雄, 升田 雅博1969 年 35 巻 417 号 p. 656-661
発行日: 1969年
公開日: 2009/06/30
ジャーナル フリーThis paper deals with the rotary cutting tool wear and the velocity relief angle which is defined in this paper as the modified relief angle given by the inclination of tool face. The cutting operation with the rotary cutting tool is almost impossible when the velocity relief angle is zero. This is called the limit of the cutting. This paper also discussed the available limit of tool shape and the cutting conditions, and examined the domain of practical use.
Flank wear of the tool was discussed from the point of geometrical view, and the pattern of the tool wear was confirmed experimentally by the SUMP method (resin replica method) and the tool-maker's microscope.
The results obtained are as follows.
1) Larger tool diameter, work diameter and relief angle, and smaller tool inclination angle, depth of cut and feed tend to make the zone wider in which the cutting operation can be perf ormed.
2) Flank wear of the rotary tool advances with a curvature at the cutting edge.
3) Flank wear of the rotary tool is extremely less than that of the conventional tool, and is hardly affected by the inclination angle of the rotary tool.抄録全体を表示PDF形式でダウンロード (885K) -
吉川 弘之1969 年 35 巻 417 号 p. 662-667
発行日: 1969年
公開日: 2009/06/30
ジャーナル フリーIn finishing or machining process of crystals, mechanical behavior of the crystals is an important factor that affects the surface texture generated.
In the present paper, the effects of size of stressed part upon mechanical behavior of the part of crystal surface in the process of finishing is investigated theoretically. The sizes are classified into four categories each of which is characterized by the lattice defects existing, that is, dislocations and cracks. Investigation upon the operating predominance of lattice defects for each category revealed the distinction in mechanical behaviors of crystals of each category, when impressed by an indenter. In the crystal of very small size where no dislocation and no crack exists, indentation of tool upon crystal surface gives rise to the generation of dislocation first prior to brittle fracture. In the crystal with only dislocations, where it was revealed that the analysis by the elastic-plastic theory is essential, plastic deformation occurs first, some amount of which allows cracks to nucleate in the deformation zone and to extend into elastic zone giving rise to macroscopic brittle fracture. The forming mechanism of plastically deformed zone around indentation, and size-dependent brittle-ductile transition mechanism are explained. Those studies have made it possible to predict the behaviors of various crystals in finishing process, and to establish some general rules for the selection of finishing method which is optimal for the surface property required.抄録全体を表示PDF形式でダウンロード (875K) -
岡本 隆, 小川 昌平, 木村 文秀, 工藤 建彦1969 年 35 巻 417 号 p. 668-674
発行日: 1969年
公開日: 2009/06/30
ジャーナル フリーIn the present paper, the results of basic experiments conducted on ultrasonic vibration shaving is described, as a mean of obtaining the smooth surface.
As first step, the cutting mechanism in vibration shaving was investigated, then the shaving was performed by running a cutter in meshing with a work gear supplied the ultrasonic vibration. After shaving, accuracy of gear, surface roughness of gear tooth and noise in running were measured, then these results were compared with those in case of ordinary method.
These results when summarized are as follows.
(1) The cutting direction of shaving cutter on the tooth surface and the rake angle of cutting edge in cutting vary in every moment. And there is the period when tooth surface is not cut, which changes in compliance with the position of tooth surface and the vibration conditions.
(2) The roughness of tooth surface finished by vibration shaving becomes smoother than that by ordinary shaving, therefore the extent of decrease in the noise in running compared with that before shaving is larger than that in the ordinary method.
(3) The accuracy of gear is improved by shaving, but there is no significant difference between ultrasonic vibration shaving and ordinary shaving.抄録全体を表示PDF形式でダウンロード (1081K) -
石橋 彰1969 年 35 巻 417 号 p. 675-677
発行日: 1969年
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (505K) -
加藤 顕剛1969 年 35 巻 417 号 p. 678-684
発行日: 1969年
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (774K)
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