精密機械

尺度の歴史

II.ヤードとメートルの沿革

小泉袈裟勝

1961 年 27 巻 313 号 p. 81-85
発行日: 1961/02/05
公開日: 2010/02/16

DOIhttps://doi.org/10.2493/jjspe1933.27.81

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ダイヤモンド砥石による研削に関する研究(第2報)

仕上げ面粗さについて

田中義信, 井川直哉

1961 年 27 巻 313 号 p. 86-92
発行日: 1961/02/05
公開日: 2009/06/30

DOIhttps://doi.org/10.2493/jjspe1933.27.86

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As a part of the studies on grinding action of the diamond wheel where plunge cut method by plain cup wheels of bronze bonded was employed, we in this paper discuss some theoretical and experimental investigations on the roughness of ground surfaces.
Assuming that grinding tips are distributed at random in the wheel, the theoretical formulae representing H_max and roughness distribution curves were derived in the case of the wheel having conical or spherical grinding tips. And it was shown experimentally that H_max decreased with increasing of the diamond concentration, or with decreasing of the grain diameter used for the wheel. Though the theory agreed with the experimental results to some extent, it was recognized that the falling off of the abrasive grains out of the wheel surface is an important factor of formation of the ground surface in practice.

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鋼球転造ロールに加わる転造力について

粟野泰吉, 落合正男

1961 年 27 巻 313 号 p. 93-100
発行日: 1961/02/05
公開日: 2009/06/30

DOIhttps://doi.org/10.2493/jjspe1933.27.93

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An apparatus measuring the three components of the rolling force was set up on the experimental steel ball rolling machine in order to obtain design data for a steel ball rolling machine. The three components of the rolling force were measured under various rolling conditions on the following three kinds of rolling dies : Type A designed so as to disconnect adjacent rolled balls, Type B designed so as to leave the connecting part of rolled balls and Type C designed so as to have gradual feeding. The form of the rolling force curve of each type was similar to that of calculated curve of the contact area of the ball rolling die and the blank. Three components of the rolling force were greatly affected by the setting position of each pair of rolling dies. These three components increased with the increase of the diameter of a rolled blank and decreased with the increase of the heating temperature of the rolled blank. At the range of 16 to 20 mm diameters of the manufactured steel balls, the revolutions of the rolling dies 200 to 300 rpm were recommended. The application of a proper lubricant was effective to decrease the rolling force.

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非金属歯車における歯の荷重分担について

会田俊夫, 寺内喜男

1961 年 27 巻 313 号 p. 101-105
発行日: 1961/02/05
公開日: 2009/06/30

DOIhttps://doi.org/10.2493/jjspe1933.27.101

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In the present paper we describe the results of theoretical and experimental studies on the load distribution of non-metallic gear teeth.
The measurement of load distribution is carried out with method in which the strain on root fillet in the case of slow rotation of the gears is compared with the strain in the case of full loading on one tooth, and the measurement of strain on root fillet is carried out by the electric resistance strain gauges stuck there.
The result of theoretical study shows good coincidence with the result of experimental study.
As a result of this study we find that tooth profile correction is necessary to get good load distribution when metalic gear is meshed with non-metalic gear.
The value of correction is found easily with the method adopted in the present paper.

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非金属歯車の動荷重について

会田俊夫, 寺内喜男

1961 年 27 巻 313 号 p. 106-112
発行日: 1961/02/05
公開日: 2009/06/30

DOIhttps://doi.org/10.2493/jjspe1933.27.106

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In the present paper the authors have carried out a study on the stress on root fillet of non-metallic gear tooth in meshing by use of the gear running test machine and the measuring equipment of dynamic load designed by the authors.
In consequence we got following results.
(1) The dynamic load is increased according to the increase of the circumference speed and yet it shows the maximum value when the meshing period of gear teeth coincides with the period at natural frequency of gear tooth, then dynamic load is decreased as the speed is increased still more.
(2) The rate of increase of dynamic load shows smaller value as static load of gear tooth becomes larger.
(3) The fillet stress is larger in the case of speed up gears than in the case of reduction gears.
(4) The tendency of dynamic load coincides with the tendency of wear and noise properties.

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ころがり軸受のスメアリングクラックに関する研究(第1報)

クラック発生部の調査結果および高圧すべり接触面温度に関する2,3の実験

田中義信, 前川良雄, 井川直哉, 三木敏雄

1961 年 27 巻 313 号 p. 113-118
発行日: 1961/02/05
公開日: 2009/06/30

DOIhttps://doi.org/10.2493/jjspe1933.27.113

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One of troublesome problems of ball and roller bearings, especially of roll neck bearings, is appearance of the smearing crack which is often observed on smeared surfaces of the bearing races.
Some metallurgical observations on the cracked part of the race showed that the structure of the surface layer at the region near the crack was changed from the normally quenched and tempered structure, and that sliding contact between a race and mating part, accompanied with high frictional heating, was likely to cause appearance of the crack and change of the metallurgical structure.
Then the sliding contact under high pressure-sliding between SKH 2 and SUJ 2 (JIS) test pieces-was analysed experimentally, especially on the interface temperature of the contact. The interface temperatures of about 1200°C high were measured in the sliding of a second Under the conditions of sliding velocity 119 cm/sec., contact area 2. 0 or 1. 4cm2²and contact load 175-340 kg.
And on stop of the sliding, the interface temperature dropped so quickly as to harden the steel structure.

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高級鋳鉄(FC 30)の旋削作業標準

切削作業標準設定に関する研究(第7報)

竹山秀彦, 糟谷梅太郎, 谷戸勉, 吉川悌二

1961 年 27 巻 313 号 p. 119-124
発行日: 1961/02/05
公開日: 2009/06/30

DOIhttps://doi.org/10.2493/jjspe1933.27.119

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This paper is 7th report of the project for establishing the machining standards, in which the process to obtain the operation standard for turning high class cast iron (FC30) is described. The best carbide grade and the most reliable tool shape are found out on the basis of tool life. In addition to it, the effects of other cutting conditions upon tool life are investigated.

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小さい部品の計測管理

二神泰次郎

1961 年 27 巻 313 号 p. 125-128
発行日: 1961/02/05
公開日: 2009/06/30

DOIhttps://doi.org/10.2493/jjspe1933.27.125

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特許紹介

1961 年 27 巻 313 号 p. 130-132
発行日: 1961/02/05
公開日: 2009/06/30

DOIhttps://doi.org/10.2493/jjspe1933.27.130

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