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Volume 37, Issue 433
Displaying 1-14 of 14 articles from this issue
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[in Japanese]1971 Volume 37 Issue 433 Pages 85-92
Published: February 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1486K) -
Fundamental Studies on the Beginning Phenomena of Cutting (3rd Report)Toshio YUTA1971 Volume 37 Issue 433 Pages 93-97
Published: February 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn order to find experimentally the effect of the factors : rigidity of machine, the rate of increasing depth of cut, and temperature which is containd in the factors of cutting speed, on the phenomenon in the beginning of cutting, an experiment was carried out on low speed orthogonal-cutting with a gradual increasing depth of cut using carbon steel as specimen.
It is observed from this work that the phenomenon is influenced by the work piece tem-perature, that is, the critical normal force decreases and coefficient of friction increases with increasing the work peace temperature. It is also observed that the critical normal force decreases with increasing rigidity of machine and the rate of increasing depth of cut. The factors of rigidity and the rate of increasing depth of cut are thought to be the same effects as load speed.View full abstractDownload PDF (2758K) -
Profile Analysis of Drilled HoleJunichiro KUMABE, Takesi SABUZAWA1971 Volume 37 Issue 433 Pages 98-104
Published: February 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe purpose of this study is to analyze the drilling properties of wood by using the ultrasonically vibrated drill. In this paper, at first, the measuring method and numerical expression of the drilled hole profile are investigated.
The results are as follows :
1) A new measuring method is applied to draw graphically drilled hole profile.
2) General formula are introduced to define and estimate hole profile from measured values for roundness, cylindricity, straightness of axis and squareness to reference plane.
A result of its practical application to a hole of 3.3 mm indiameter and 20 mm in depth is shown.
3) It is found that the drilled hole profile properties can be clarified and analyzed with above calculated values.View full abstractDownload PDF (4181K) -
Hideo INOUE1971 Volume 37 Issue 433 Pages 105-111
Published: February 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSFor the purpose of studying on strength of centrifugal rupture of grinding wheel, centrifugal bursting test of rotating vitrified grinding wheel (JIS Type 1A) and bending test of abrasive bar were carried out. The conventional grinding wheels and reinforced grinding wheels by resin-penetration around the arbor hole were used for this study. The strength of centrifugal rupture of grinding wheel and bending strength of abrasive bar increases with increasing the wheel hardness and mesh number of abrasive grain. By the resin-penetration, the bending strength of abrasive bar is doubled nearly and Young's modulus of elasticity is also increased as much as 50%. From the experimental results and the theoretical analysis on stress distribution due to the inertia force of rotating grinding wheel, it becomes clear that the centrifugal rupture of grinding wheel can be presumed by the average stress theory. That is, by knowing the bending strength of abrasive bar with a given composition and using the average stress theory, a bursting revolution speed of grinding wheel with same composition can be predicted.View full abstractDownload PDF (1101K) -
In the case of Orthogonal Cutting and MillingKozo KISHI, Hiroshi EDA1971 Volume 37 Issue 433 Pages 112-118
Published: February 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this paper, it is investigated the effect of volume fraction of lamellar cementite ranging from 1.0×10-2 to 14.1×10-2 on the residual stresses of the machined surface layer in the orthogonal cutting and down milling as first step. And then, it is carried out on the measurements of cutting force, surface roughness and chip thickness. On the other hand, damaged structure of machined surface layer was observed by means of photomicroscope and electron microscope. A summary of the results is shown below b In the orthogonal cutting, the volume fraction of cementite has the effect of decreasing the residual stresses on machined surface, cutting force and surface roughness for the containg about 3.0×10-2 cementite and there were a higher value for the containing about 7.5×10-2 Cementite. And when containing about 7.5×10-2 cementite for the milling. The cutting force, surface roughness shows a lower value and the residual stress on machined surface shows a higher compresive stress. Increasing the volume fraction of lamellar cementite, the residual stress in machined surface was a gradually compresive stress and the depth of its distribution on layer decreased.View full abstractDownload PDF (8625K) -
Masami OMORI, Tomoichi INOUE1971 Volume 37 Issue 433 Pages 119-124
Published: February 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSWhen the electric energy is hydro-sparked, it first transforms to the heat energy, and then to the mechanical energy.
Concerning those transformations, the pressures produced in three-dimensional space have been formulated as follows :
in the pipe, Pmax1/r (2ηE0cρ0/5πt1) 1/2
in the water, Pmax=13.95 1/r (ηE0/t1) 1/2
in the three-dimensional space, Pmax=1/R (3ηE0cρ0/13πt1) 1/2
in the water, Pmax=10.6 1/R (ηE0/t1) 1/2
where R is the distance from the sparking gap, t is the time for the transformation of energy (the time for spark), η is the efficiency of energy transformation, ρ0 is the density of liquid, c is the speed of propagation, and Eo is the energy discharged from the capacitor bank.
The maximum pressures calculated by those equations have been proved experimentally. Based on above analysis and experiments, diagrams have been drawn which express pressures developed by hydro-spark of 5000 to 20000 Joules electric energy. Those diagrams are useful in design of Hydro-spark forming machines.View full abstractDownload PDF (943K) -
Tomohiko ABE, Masaharu TAKANO, Yasuo JIMBO1971 Volume 37 Issue 433 Pages 125-131
Published: February 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSEine Reibungskraft verursachet zwischen zwei mit konstanter Relativgeschwindigkeit zueinander bewegten Oberflächen ist konstant und durch die Relativgeschwindigkeit festgelezt. Der Betrag dieser Reibungskraft jedoch erscheint, wenn mikroskopisch betrachtet, als zeitveranderiche Funktion.
Dieser Artikel beschreibt eine experimentell gefundene Beziehung zwischen der zeitlichen Änderung der Reibungskraft hervorgerufen durch eine konstante Relativgeschwindigkeit und der geometrischen Beschaffenheit der Oberflächen.
Die Änderung der Reibungskraft mit der Zeit wächst mit der Oberflächenrauheit, die im Experiment variiert wurde. Dabei wurden hohere Frequenzanteile aus der Spektralanalyse der Oberflachenform vernachlässigt, nur die niedrigeren Frequenzanteile wurden linear in die zeitlichen Änderung der Reibungskraft transformiert.
Sei X (t) der Verlauf der Oberflächenrauheit ohne hiiherer Frequenzanteile und Y (t) der Zeitverlauf der Reibungskraft, dann wurde folgende Gleichung :
Y (t) =k dX (t) /dt
im Experiment bestätigt.View full abstractDownload PDF (949K) -
Studies on Micro-Burnishing (1st Report)Hideo TSUWA, Hidejiro YAMADA1971 Volume 37 Issue 433 Pages 132-137
Published: February 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA method of “micro-burnishing” has been developed in which the surface roughness of metal is improved plastically without removal of the material. A track is made by sliding a burnisher (spherical diamond) on finished metal surface with a constant load. Then plastic deformation is introduced over the track and the asperities of the surface are smoothed. Finally, the smooth surface can be obtained by the accumulation of these tracks made on the surface succesively by the feed. Besides the surface flattening which is introduced through the plastic deformation of the asperities, the micro-burnished surface accompanies the periodical surface waviness, the pitch of which is the same as that of the feed. Experimental studies have been made for the effects of the load and the feed rate on the micro-burnished surface roughness. It has become evident that the surface roughness is improved remarkably by the present method and that under the suitable conditions the copper surface preliminary finished by the emery paper (6/0) can be micro-burnished as smooth as the scratches or defects are almost undetectable even by the electron-microscopy.View full abstractDownload PDF (1521K) -
Chip Formation at Cutting Speed with Need to Take into Consideration Particle Velocity and Plastic Wave PropagationAkira YAMAMOTO, Motosada KANDA, Takahiro TSUJINAGA1971 Volume 37 Issue 433 Pages 138-144
Published: February 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn order to study chip formation mechanism in ultra high cutting speed, an aluminium. plate is cut orthogonally at 400014000 m/min with a tool which is shot out by means of expansion of high pressure gas. The main results are as follows :
(1) Material element which flows into across the shear plane spreads to about twice the width of the workpiece at the shear plane and is squeezed to form a big burr along the tool face as a result of hydraulic deformation caused by impact. (2) The shear angle increases, for instance, up to 50° with 30° rake angle, and then tends to fall at a speed of over 10000 m/min. (3) The impact term is led from a change of flow direction of chip before and after cutting, and the cutting force which contains this term is calculated. Tangential force in the experiments decreases with increasing speed as a continuation from conventional speed range, and increases after minimum value at 60008000 m/min. This tendency can be explained from the increases of shear angle and the impact term. (4) It is revealed from the results of calculation that the tangential force in impact term is equal to that in pure cutting term at about 21000 m/min and the normal force decreases to a minus value for the positive rake angle.View full abstractDownload PDF (6420K) -
Teruo TAKAGAMI, Yasuo JIMBO, Masaharu TAKANO1971 Volume 37 Issue 433 Pages 145-150
Published: February 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA torsional vibrometer with long natural period has been produced. The dimensions are 94φ×95 mm, weight 825 g, and the natural period 19 sec. A size 72φ×37 mm empty cylinder which has a apparement specific weight less than unity, rotates around a vertical axis. The case of the rotor is filled with a mixture of two kinds of oil adjusted to have the same specific weight as the rotor. Thus the weight of the rotor is supported by the buoyancy of the oil and the load of pivot bearings becomes very light. A hair spring of a clock is used as a restoring spring. The inner terminal of the hair spring is attached to the axis of the rotor and the outer termial is attatched to a fixture of the case. The position of the fixture can be adjusted to regulate the neutral position of the rotor. The movement of the rotor is detected by the change of electric capacity. Six pairs of electrodes are attached to the rotor and the case. It's sensitivity is 4.6 pF/rad. Frequency characteristics of an electric circuit can be changed by changing a capacity or a resistance in the circuit. This adjustable electric circuit compensaites the change of frequency characteristics of the movement of the rotor by temperature.View full abstractDownload PDF (1521K) -
[in Japanese], [in Japanese], [in Japanese]1971 Volume 37 Issue 433 Pages 151-153
Published: February 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (442K) -
[in Japanese]1971 Volume 37 Issue 433 Pages 154-161
Published: February 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (3557K) -
1971 Volume 37 Issue 433 Pages 161a
Published: 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSDownload PDF (91K) -
1971 Volume 37 Issue 433 Pages 161b
Published: 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSDownload PDF (91K)
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