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Volume 35, Issue 419
Displaying 1-12 of 12 articles from this issue
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Hiroshi UCHIYAMA1969 Volume 35 Issue 419 Pages 759-764
Published: December 05, 1969
Released on J-STAGE: February 15, 2010
JOURNAL FREE ACCESSPitch error measurements on individual gears may be carried out in two general ways : (a) Direct Angular Measurement (b) Step by step Measurement.
The second method is more widely used. However, the disadvantage of this method is that measuring errors are cumulative.
The following three are the main causes of measuring error : (1) Dispersion of readings (2) Displacement of reference point (3) Changes in room and test gear temperature.
The method of dividing teeth into groups is very useful for minimizing the influence of the above errors on the result. Here the number of teeth of a test gear Z is divided into the number of groups S and if the number of teeth in each of the groups is s, Z=S×s.
The proper number for S is about √2Z, and consequently s is √Z/2.
In this method the measuring error can be expressed as follows :
σFK_??_√S/2 · σ= (2Z) 1/4/2 · σ
Where σ is the standard deviation of the dispersion of readings.
The usefulness of this method is confirmed by experiment.View full abstractDownload PDF (767K) -
Studies on Compacting of Metal Powder (3rd Report)Yuzo AKETA, Hideo TSUWA1969 Volume 35 Issue 419 Pages 765-774
Published: December 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIt is necessary to establish the theory of compacting metal powder in order to analyse the stress and density distributions in the compacts which influence the mechanical preperties of sintered machine parts.
The authors explain the mechanism of compacting metal powder and try to establish a theory of the process, that is, a powder mechanics by obtaining some mechanical properties of metal powder substances experimentally.
The results of theoretical and experimantal approaches are as follows :
(1) It is experimentally proved that the Mohr's theory holds well on the theory of compacting metal powder. Then, it is considered that the mechanism of compacting metal powder is the shearing slips of powder particles, which cause the maximum principal strain, being accompanied with the increment of the density.
(2) By the Mohr's theory, the critical shear stress gives the relation between the principal stresses and determines the stress state in the metal powder substances. The relation of the critical shear stress τ0 to the compressive stress σ on the shear plane is expressed by the exponential function.
(3) The compacting density ρ of the powder substance is determined by the maximum principal stress σ1, and the relation between σ1 and ρ is expressed by the exponential function.
(4) The equations in the theory of compacting metal powder could be established.View full abstractDownload PDF (1337K) -
Study on the Temperature Distribution in the Workpiece During Metal Cutting (2nd Report)Yoshiaki KAKINO, Keiji OKUSHIMA1969 Volume 35 Issue 419 Pages 775-779
Published: December 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSPaying a special attention to the residual stresses by thermal stresses out of the others in machining, the effect of the temperature distribution in the workpiece as the thermal stresses on the residual stresses in the machined surface was investigated. As cutting temperature distributions for calculation of thermal stresses, experimentally measured distributions and theoretically calculated ones were used. Stress analysis was conducted by using the finite element method. The following results are obtained.
1) Residual stress by thermal stress is tensile in the machined surface layer, on the contracy, in the inner layer it is small compressive.
2) At higher cutting speed residual stresses are produced mainly by thermal effect, and the higher cutting speed, the larger tensile residual stress in the machined surface layer.View full abstractDownload PDF (554K) -
On the Study of Honing (3rd Report)Hisashi TOGII, Hideo TSUWA1969 Volume 35 Issue 419 Pages 780-786
Published: December 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper deals with the experimental analysis of generating mechanism of the cylindricity produced by honing with the use of a resin molded stone.
The experimental machine is a horizontal honing unit and the work is S 55 C (HRC 40).The generating mechanism of cylindricity was examined by seeking the relationships between the honing conditions (stock removal by honing, overtravel, dwelling time, etc.) and the cylindricity. The results which proved that, under the same condition, the error of cylindricity produced with the molded stone is less than that with the unmolded stone and that the cylindricity is greatly influenced by the number of abrasives which pass an optional point on the surface of the work and by the elastic deformation of the stone, have enabled us to describe the generating mechanism of cylindricity.View full abstractDownload PDF (1338K) -
Study on Lapping Mechanism of Si Single Crystal (1st Report)Masayuki IKEDA1969 Volume 35 Issue 419 Pages 787-793
Published: December 05, 1969
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSBy using a model lapping technique, the acting force is evaluated based on the relation that the dislocation extent produced by indentation on Si (111) surface increases with the load. The distribution of the acting force is also obtained and interactions between abrasive grains and the Si surface are discussed with the aid of the electronmicroscopic observation on the surface worked. The main results obtained are as follows : (1) The number of grains which acting takes part in lapping is only about 0.34% of total grains existing on the working area of the lap in the range of lapping pressure 23409 g/cm2. (2) The acting force is independent of lapping pressure and its magnitude is about 6.9 g by the use of WA # 800. (3) The number of grains which do scribing is about 10% or less of acting grains. (4) The distribution curve of the acting force is very similar to that of grain minor axes.View full abstractDownload PDF (2070K) -
Makoto ICHIKAWA1969 Volume 35 Issue 419 Pages 794-799
Published: December 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA measuring apparatus, similar in mechanism to the gear hobbing machine whose hob spindle cannot be inclined, has been produced experimentally, and has the test gear and a detector in place of the gear blank and the hob, respectively.
The rotating detector contacts with a tooth surface which rotates accurately and detects the position of tooth surface and records the cumulative pitch error. The detector, utilizing a wire strain gauge, is connected to an electric auto-recording micro-comparator which records the cumulative pitch error histogrammatically.
By using several detectors, the cumulative pitch error and profile error of all teeth can be recorded simultaneously. Moreover, by using two detectors, cumulative pitch error of two facing surfaces can be recorded simultaneously.View full abstractDownload PDF (2308K) -
[in Japanese]1969 Volume 35 Issue 419 Pages 800-811
Published: December 05, 1969
Released on J-STAGE: June 30, 2009
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[in Japanese]1969 Volume 35 Issue 419 Pages 812-816
Published: December 05, 1969
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESS -
[in Japanese]1969 Volume 35 Issue 419 Pages 817-824
Published: December 05, 1969
Released on J-STAGE: June 30, 2009
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1969 Volume 35 Issue 419 Pages 824a
Published: 1969
Released on J-STAGE: November 19, 2010
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1969 Volume 35 Issue 419 Pages 824b
Published: 1969
Released on J-STAGE: November 19, 2010
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1969 Volume 35 Issue 419 Pages 824c
Published: 1969
Released on J-STAGE: November 19, 2010
JOURNAL FREE ACCESSDownload PDF (316K)
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