精密機械

プランヂカツト研削法の研究(第1報)

研削加工量と研削抵抗について

佐藤健児

1956 年 22 巻 254 号 p. 127-131
発行日: 1956/04/05
公開日: 2009/06/30

DOIhttps://doi.org/10.2493/jjspe1933.22.127

ジャーナルフリー

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The author designed a new torque-meter constituted by two pairs of bevel gears as shown in Fig. 2, and he measured the tangential grinding force and the amount of stock removal on various grinding conditions.
The rate of stock removal M in plunge-cut grinding may be analytically expressed by the formula,
M= 0.213 ^wV/_r ρ( N/Hv)^1.5
where, w is the mean cutting edge distance of the wheel, r is the mean radius of cutting edge assumed as a sphere, V is the grinding speed, N is the grinding pressure, ρ is the density and H_v is the Vickers hardness of the work.
The tangential grinding force T may be divided in two parts; one is the chip shearing force T_a, and the other is the friction between the wheel and the work, μN, where μ is the coefficient of friction in grinding. That is,
T=T_a+_μN.
Experimentally, a was determined as 0.2 for hardened steel and 0.55 for anneald steel. And thus, the relation between the chip shearing energy E= T_αV/M and the mean chip cross-sectional area a was shown in Fig. 8.

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金属仕上面からの反射

反射率曲線の理論について

蓮沼宏

1956 年 22 巻 254 号 p. 131-135
発行日: 1956/04/05
公開日: 2010/02/16

DOIhttps://doi.org/10.2493/jjspe1933.22.131

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A wave optical theory of diffuse reflection of light from metal surfaces was given. Metal surface was represented by a probability function obeying the Ornstein-Uhlenbeck process and the reflection of light was calculated by a method similar to that of the Kirchhoff's diffraction theory. The distribution of the diffusely reflected light is given by a formula which is characterized by two constants h and β, the former being r. m. s. height and the latter being related with the average inclination of roughness peaks. The theoretical formula is well fitted with that of the experimental.

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時計用特細密錐の切削の研究(第3報)

微細錐の焼入と強度の改善について

志茂主税

1956 年 22 巻 254 号 p. 135-138
発行日: 1956/04/05
公開日: 2009/06/30

DOIhttps://doi.org/10.2493/jjspe1933.22.135

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In this report, the fine drill rod of 0.80 mm dia. was cut by an automatic lathe. The rod made of high carbon steel containing 1.001.10%C, 1.01.5%W, 0.51.0% Cr. etc. In a workshop, the rod was heated at about 850°C in the alcohol lamp flame and dropped in oil. After having tested several methods of heating, quenching and annealing of them, we found the rod stronger and straighter than before. The best method is "Austempering".

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