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Volume 35, Issue 414
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1969 Volume 35 Issue 414 Pages 431-437
Published: July 05, 1969
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSDownload PDF (4613K) -
[in Japanese]1969 Volume 35 Issue 414 Pages 438-444
Published: July 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (997K) -
Fundamental Study on High Frequency Vibration SuperfinishingTakashi OKAMOTO, Shohei OGAWA1969 Volume 35 Issue 414 Pages 445-451
Published: July 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe present paper describes on the vibration small depth cutting performed by one model grain for the purpose of analysing the performances of high frequency vibration finishing. In this study, the characteristic phenomena that the grain passes over again the groove already cut and cuts the rising part which was built up at the both sides of groove were analysed, then the cutting resistance and the wear of model grain were measured.
From the analysis about a cutting locus and the experimental results, we can explain the removed volume of work piece and the loss of stone in the high frequency vibration superfinishing and obtain a guide to determine the optimum conditions.View full abstractDownload PDF (835K) -
Study on Generation of Iridescent Surface IHiroyoshi SAITO, Akio KAMOGAWA, Toshio SATA1969 Volume 35 Issue 414 Pages 452-457
Published: July 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe iridescent reflection light observed on the machined surface is analysed with diffraction theory of light and the relation between surface profile and diffraction spectra is discussed in general. At first the surface is assumed to be a single sinusoidal wave form and secondly to be composed of various components. In the case of a sinusoidal wave form, the diffraction spectra are discrete lines separated by a equal spacing that depends on the period of the surface profile. The envelope of amplitude distribution of the spectra is the first kind Bessel function. The diffraction spectra in the case of composition of sinusoidal waves can be obtained by the convolution of line spectra of all components. Therefore, separate line spectra can be observed only when the surface profile is defined as a periodic function. The waviness of surface and the pitch error of feeding cause many ghost spectra between each principal spectrum, when the iridescent color become less pure and whitish.View full abstractDownload PDF (875K) -
Shearing Mechanism in Shear ZoneYoshinobu TANAKA, Hideo TSUWA, Masanori KITANO1969 Volume 35 Issue 414 Pages 458-463
Published: July 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe purpose of the present study is to analyze the chip formation mechanism at the high speed range above critical impact velocity. As to the characteristics of ultra high speed cutting, the temperature distribution in shear zone is of importance. It seems that the cutting mechanism is affected mainly by the temperature and its distribution.
Consequently, the relationship between the theoretical temperature characteristics and experimental shear strength in shear zone was studied.
The results are as follows :
1) The temperature gradient is relatively small at lower cutting speeds, but the gradient becomes steeper at an increased cutting speed.
2) The shearing stress increases with the speed, and it can be presumably attributed to that, at a high speed, the shear will initiate at the cooler uncut portion due to the steep tem-perature gradient.
3) At a sufficiently high speed, the heat generated locally causes steep temperature gradient and results in catastrophic deformation known as “adiabatic slip”. However, the initial strength of shear plane and shear strength increase due to high strain rate.View full abstractDownload PDF (1163K) -
Junichiro KUMABE, Mamoru DAIMON1969 Volume 35 Issue 414 Pages 464-470
Published: July 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this paper, tapping torque is experimentally and theoretically investigated. In the conventional analyses, the specific cutting resistance K acting at every cutting edge in the chamfer of a tap is dealt as if it were constant, and the equation to calculate tapping torque is given as follows : Mr=∫rr0KrdA=K∫rr0rdA, where, Mr : tapping turque, r : distance of cutting edge from the axis, r0 : radius of atap hole, dA : infinitesimal strip of a cutting area. From this study, it is clarified that K varies with r as shown in the following relation : K=K (r) =K0ea (r-r0) , where, K0, a : const.
This leads to the following new general equation for calculating tapping torque. Mr=∫rr0 K (r) rdA. The results obtained are as follows. (1) In one investigation using S35C steel, specific cutting resistance K (r) changes from 270 kg/mm2 to 880 kg/mm2 depending upon r and in another using BsBM2 brass, from 104 kg/mm2 to 260 kg/mm2. (2) Function K (r) is experimentally obtained by conventional fluting with cutting-off tools which have the identical cutting edges as in the chamber of the tap used. (3) Our new equation gives the theoretical torque curves which coincide exactly with the curves obtained by experiments.View full abstractDownload PDF (1005K) -
Dynamics and Design of Dynamometer (The 2nd report)Susumu SHIOZAKI, Masakazu MIYASHITA1969 Volume 35 Issue 414 Pages 471-476
Published: July 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the 1st report, the dynamic influence of the dynamometer upon the grinding depth of cut and the fidelity of measurement considering it were analyzed, and from these analyses some fundamental formulae were introduced and enabled the design of the dynamometer with the specified allowable error and frequency range for the measurement. Furthermore, design procedures considering practical technical problems were set up.
In the present paper, following these design procedures, the octahedral elastic ring dynamometer with the specifications of the allowable error 20% and the frequency ranges 01700 Hz (normal direction) and 01100 Hz (horizontal direction), and the two-force component piezoelectric dynamometer with the natural frequency as high as 180 kHz and the static rigidity more than 100 kg/μ have been experimentally produced. The former is an example in such a case where measuring frequencies are low and the additional damper can be easily equipped. The latter is an example in such a case where the natural frequency of the dynamometer is high and it is technically difficult to attach the damper.
And expected results are obtained.View full abstractDownload PDF (1257K) -
[in Japanese]1969 Volume 35 Issue 414 Pages 477-483
Published: July 05, 1969
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSDownload PDF (1253K)
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