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Volume 33, Issue 386
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[in Japanese]1967 Volume 33 Issue 386 Pages 153-158
Published: March 05, 1967
Released on J-STAGE: June 30, 2009
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H. A. Rothbart, [in Japanese]1967 Volume 33 Issue 386 Pages 159-160
Published: March 05, 1967
Released on J-STAGE: June 30, 2009
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Relations between the Interference Angle and Sliding Phenomenon of the Cutting EdgeKenjiro OKAMURA, Toshikatsu NAKAJIMA, Kuniaki TAIRA, Kozo FUJIWARA1967 Volume 33 Issue 386 Pages 161-167
Published: March 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSSliding phenomena of cutting edges on the surface of workpiece are important peculiarities which must be taken into consideration on making clear chip formation in grinding. Abrasive grains may not produce chips in forms settled geometrically and may slide on the surface of workpiece from the beginning of contact to a certain point without chip formation.
In this report, such various phenomena at the beginning of cut as elastic and plastic lengths of contact between the cutting edge and workpiece have been investigated by having carried out cutting experiments, where the cutting velocity have been changed in transitional region of voelocity between turning and grinding and the interference angle in the very small range, in case that the depth of cut have increased linearly with the cutting distance.
The results are as follows.
In the cutting where the depth of cut increases linearly from zero, there are the region of elastic deformation and that of the plastic before the cutting region and critical points limiting these three regions are settled by the value of the depth of cut. The elastic and plastic lengths of sliding increase, therefore, with the decrease of the interference angle. Then the effect of the cutting velocity on cutting process is considerably large and elastic and plastic sliding lengths of cutting edge decrease with the increase of the cutting velocity.View full abstractDownload PDF (1230K) -
Heat Transfer under the Appearance of a Pool on the Cooling SurfaceAkira YAMAMOTO1967 Volume 33 Issue 386 Pages 168-174
Published: March 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSHeat transfer in mist cooling is studied experimentally. A thin copper disk heated below is blowed by water mist which forms a liquid pool on the disk surface. By considering the complete evaporation of water in mist that arrives at the cooling surface, the heat transfer rate and the average heat transfer coefficient on the surface covered with mist are analysed. Emperical formulas are derived for the heat transfer rate and the heat transfer coefficient, depending on the size of liquid pool, blowing conditions of mist and mist arriving circumstances on the surface.View full abstractDownload PDF (1347K) -
Study on Compatibility of Kudo's Slip Line Solutions for Two Dimensional Flow-Type Machining (Part 1)Eiji USUI, Koji TAKADA1967 Volume 33 Issue 386 Pages 175-182
Published: March 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSGrid line deformations produced in two dimensional flow-type machining of metals of various strain-hardening characteristics are compared with those of Kudo's solutions. In slow speed machining, the solutions fail to account for plastic deformation arising from the pre-flow region, which always appears regardless of strain-hardening in work materials, although they appear to be in success for explaining chip curl and secondary flow along tool-face. In high speed machining, on the contrary, the theoretical patterns using velocity discontinuity appear to be in good agreement with experimental patterns due to disappearance of the pre-flow region. It is also interesting that Kudo's solution with frictional stress of k, maximum shear stress, along whole tool-chip interface does realize in high speed machining.
The permissible range of Kudo's solution in the plot of φ against β-α, where φ, β and α are shear angle, friction angle and rake angle respectively, is determined by using the restrictions of possible frictional stres distribution, mass continuity and Hill's theorem. While the range covers almost all of Merchant and Lapsley's experimental results, it is unsuccessful to cover the results in slow speed machining. The reason may lie in the incompleteness of the solutions for explaining the pre-flow region.
Some new slip line solutions involving the pre-flow region are proposed in order to cover the slow speed machining data, although they are not complete in theoretical point of view.View full abstractDownload PDF (1388K) -
Loading of Grinding Wheel (V)Hidemi SHIGEMATSU1967 Volume 33 Issue 386 Pages 183-189
Published: March 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe effects of grinding wheels and work materials on loading were already reported in the preceding papers. In this article, the relations detween working conditions and loading are described.
The results obtained are as follows:
(1) The quantities of loading depend largely upon the working conditions (changes of peripheral speed of grinding wheel and workpiece, depth of cut, feed rate, dressing speed, etc.).
(2) The quantities of loading change considerably with the change in the relative speed between wheel and work.
(3) The rate of loading change suddenly under the conditions producing chatter and burn.View full abstractDownload PDF (1381K) -
Taro UEDA, Masao TANAKA, Tetsuo MATSUO, Kumayasu YOSHII1967 Volume 33 Issue 386 Pages 190-196
Published: March 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThe Mo-high speed steel (SKH 9) is now used in high-temperature bearing because of their ability to maintain high hardness at elevated temperature. An important problem in high-temperature bearing is creep and fatigue of races, but there is hitherto very little information on the creep or fatigue resistance of this steel. On the other hand, nitriding is receiving much consideration as a means of increasing the high-temperature hardness and wear resistance. In the present study bending or torsion creep tests and rotating bending fatigue tests were carried out on a oil-quenched and tempered Mo-high speed steel at test temperatures of 300 to 500°C, and also experiments were made on the influence of nitriding on these creep or fatigue strength. The results obtained are as follows:
(1) At the test temperature 300°C creep does not take place even at the stress of about 50% of static strength, while at 400°C steady-state creep rate increase lineally as the stress increase, and at 500°C becomes the creep more remarkable.
(2) Nitriding decreases the creep rete slightly.
(3) The endurance limit under rotating bending are 61 kg/mm2 for 300°C and both for 400°C and 500°C are about 40 kg/mm2.
(4) These endurance limits can be increased 18 to 55% by nitriding.View full abstractDownload PDF (1268K) -
On the True BeatsTakesi YANAGISAWA, Kijuro NAKAMURA1967 Volume 33 Issue 386 Pages 197-201
Published: March 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the beats of one string of piano the true beats can not be explained by the inharmonicity of one dimensional vibration. The authors' observation shows that one string vibrates in two principal axes. The true beats are caused by the interference between these same order harmonics. Two dimensional motions of one string are attributed to the directionality of the bearing and that of the geometrical moment of inertia of the string.View full abstractDownload PDF (1114K) -
On the Surface RoughnessNobuo KUMAGAI, Yukio TANAKA1967 Volume 33 Issue 386 Pages 202-208
Published: March 05, 1967
Released on J-STAGE: May 07, 2010
JOURNAL FREE ACCESSIn this report, the relation between the finished surface roughness and the grinding conditions on the cylindrical grinding operations by the cup type grinding wheel was studied experimentally.
The results obtained are as follows;
(1) The ground surface roughness decrease to increase of wheel speed, width of the wheel and number of traversing, and to decrease of depth of cut, surface speed of the workpiece and traversing speed. Furthermore, the surface roughness becomes smaller under the following conditions, i.e. an average diameter of the wheel: 70100 mm and an average crosshatch angle: 2080°
(2) The form factor of the finished surface becomes large value when the average crosshatch angle (φm) are as follows;
axial direction: φm≅40°
circumferential direction: φm≅180°
(3) The ratio of the surface roughness (roughness of circumferential direction/roughness of axial direction) is increase to decrease of the crosshatch angle, and that ratio become 1 when an average crosshatch angle is apporoximately 90°, and the surface of non-directional roughness is produced.View full abstractDownload PDF (1199K) -
[in Japanese], [in Japanese]1967 Volume 33 Issue 386 Pages 209-215
Published: March 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSDownload PDF (2045K)
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