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Volume 30, Issue 359
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1964 Volume 30 Issue 359 Pages 899-907
Published: December 05, 1964
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (1375K) -
Yoshinobu TANAKA, Hideo TSUWA, Suehisa KAWAMURA1964 Volume 30 Issue 359 Pages 908-913
Published: December 05, 1964
Released on J-STAGE: January 27, 2010
JOURNAL FREE ACCESSCalculations of grain depth of cut using the grinding conditions and successive cutting edge spacing reaches to very minute value in precision grinding, for example they are from 0.01 to 0.1 μ.
In these cases there appears a question whether each grain can remove such a tiny chip truely or not.
This question contains very important problems of sliding between cutting edges and workpiece surfaces.
The aims of this paper is to make clear these tiny chip formation parts, especially to know how long is the sliding distance and how much is the minimum depth of cut.
These experiments have been done with a specially made single grain grinding wheel.
The results are as follows ; sliding of grains exists appearently ; the minimum depth of cut is nearly 0.4 μ; the softer the grade of wheels and the smaller the grains, the thinner the minimum depth of cut become.View full abstractDownload PDF (5224K) -
Theoretical Analyses on the Grinding Temperature (2 nd Report)Koya TAKAZAWA1964 Volume 30 Issue 359 Pages 914-920
Published: December 05, 1964
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIn order to obtain the theory of the grinding temperature, as explained in the 1 st report, the flowing rate into the work of the heat generated by grinding should be considered, but has not been studied sufficiently.
In this report, the analyses of the flowing rate are attempted, basing on the investigation of the grinding action, and then the propriety of the analyses is made sure experimentally.View full abstractDownload PDF (989K) -
Pumping Action and Machining SpeedGenrokuro NISHIMURA, Yasuo YOKOYAMA1964 Volume 30 Issue 359 Pages 921-929
Published: December 05, 1964
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIn the present paper succeeded to the previous ones, was discussed the relation between the machining energy E and the machining speed W. The machining speed is influenced by both the working efficiency of the abrasive grains and the pumping action. The pumping action has the relation with the magnitude of the tool's amplitude and also it operates efficiently to remove the chips machined. The theoretical formulae showing the machining speed are given in the next expressions, and these formulae are confirmed to have a good agreement with the results given by the experimental study.
when |ν0|≤|νL|, W= [1/8·Kη·F02 (1-γ2)/(mf)]/[1+1/8·Kη·F02 (1-γ2)/γf (ζV+V0)log{(ζV+V0)/V0}], and when|ν0|≥|νL|, W = [1/2·KηmfνL2]/[1+1/2·KηmνL2/γ(ζV+V0)log{(ζV+V0) /V0}].View full abstractDownload PDF (3432K) -
Isamu YOSHIMOTO1964 Volume 30 Issue 359 Pages 930-935
Published: December 05, 1964
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThe accuracy of produced thread in thread rolling is mainly determined by the tolerances for the blank diameter and the thread profile of rolling dies. The tolerance for the thread profile of rolling dies must be specified taking into account its relation to the tolerance for the blank diameter. In this investigation the relationship between them is discussed, and the draft of the Japanese standard (JIS), the British standard (BS) and the Russian standard (GOST) on the rolling die are compared from such a point of view. The method for calculating the tolerance for the blank diameter from the tolerance for rolling die is established under some assumptions. The results of calculations on the above three standards show that the draft of JIS is the most suitable for the present state in Japan.View full abstractDownload PDF (1059K) -
Jiro NARA1964 Volume 30 Issue 359 Pages 936-941
Published: December 05, 1964
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThree types of high pass filter are used for cut-off in electrical roughness testers employed in Japan. Namely, type a and b in which the cut-off value is assessed at 70 % of maximum transmission in the system, having the straight part of the attenuation curve which the maximum slope of 6 dB per octave and 12 dB per octave, respectively, and type c in which it is assessed at 50 % of maximum transmission in the system, having the straight part of the attenuation curve with the maximum slope of 12 dB per octave.
In this paper, the difference between the value of center line average Ha obtained by roughness testers with the filter of type a and c are discussed in comparison with Hrms values which are obtained from the power spectrum of three samples.
The Hrms (0.75) values of the roughness curve obtained by roughness testers with the filter of type a, type b and type c, which have the same cut-off value of 0.75 mm, are 8595% of Hrms values calculated from the profile curve of the samples.View full abstractDownload PDF (853K) -
Namiteru HIDA1964 Volume 30 Issue 359 Pages 942-948
Published: December 05, 1964
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSPersonal error variance and the relative biases are analysed statistically with conformity to the design of experiments in measuring diagonals of Vickers indentation by using a micrometer microscope with a counter by which the diagonal length of Vickers indentation is indicated every one micron.
The experiments are carried out in such way that three indentations, the diagonals of which are about 550, 250 and 80 micron respectively, are measured by six members, that is the three of them are skillful researchers of Vickers hardness and the other three are experts of fine measurements of machine parts. In one day every one of the members measured the diagonal lengthes ten times for every three indentations, and this block is repeated five times in about a month.
The following conclusions have been given from the experiments :
1) A formulla (1) must be given in expressing a mutual bias of a couple of observers a and b, because day to day variations of measurement of some of the observers are significantly different with each other.
(xa-xb) ±√(σea2/na+σRa2w)/ra+(σeb2/nb+σRb2)/rb
where x : mean value
σe2 : variance within a day
σR2 : day to day variance
n : number of repeat of measurement
r : number of block of experiment
2) The bias of every couple of the members is independent to diagonal length.
3) When a confidence limit of a diagonal measurement by an observer is to be estimated, the day to day variance σR must be taken into consideration. And so the measuring accuracy of the observer is given by σe′
σe′=√(σe2/n)+σR2
4) Numerical results are as follow :View full abstractDownload PDF (986K) -
[in Japanese]1964 Volume 30 Issue 359 Pages 949-959
Published: December 05, 1964
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (12534K) -
[in Japanese]1964 Volume 30 Issue 359 Pages 960-966
Published: December 05, 1964
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (5015K)
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