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Volume 32, Issue 379
Displaying 1-11 of 11 articles from this issue
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[in Japanese]1966 Volume 32 Issue 379 Pages 521-526
Published: August 05, 1966
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1348K) -
Observation of Wear FormTadashi WAKABAYASHI, Norio TAKENAKA1966 Volume 32 Issue 379 Pages 527-533
Published: August 05, 1966
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThere are two kinds of wears in the carbide tools, such as the crater wear of the cutting face and the flank wear.
Many reports have been published about the influence of these wears on tool lives. Also the groove wear which appears often at the depth end of both side and cutting edge is known to have much influence about the tool life and the roughness of finished surface. Though there are various explanation of what the cause are.
There are few proofs based on experiments, so we can still find no consistant conclusion. At the first stage of the research concerning to groove wear, the authors performed the cutting test of carbon steel by the carbide tool and observed the progress of wear of the tool under the microscope of high magnification. Main results obtained were :
(1) At the comparatively early stage of the cutting, the crater wear occurs on the side flank which begins about at the depth end and extends toward the shank parallel to the cutting edge. The wear becomes bigger with the increase of the feed, this crater at the flank seems one reason of the development of the groove wear.
(2) It is realized that both the deformed layer of the work surface and the surface roughness of the works affect growth of the groove wear at the early stage of the cutting.
(3) The groove wear can be lessoned increasing the side-cutting-edge-angle.
(4) The crater wear of the side flank can be made less by decrease of the rake angle, but there can not be seen greater change in the usual flank wear.View full abstractDownload PDF (1706K) -
Yoitiro TAKEUCHI, Akiyoshi OKITSU1966 Volume 32 Issue 379 Pages 534-538
Published: August 05, 1966
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSRecently the conducting sheet analogue has been employed to provide a rapid and inexOnsive. method for the determination of values of stress in field of pure torsion. Applying this technique a new result is presented for the torsional stress distributions in tap-section.
From this result we know that the maximum torsional stress of the practical tap-section come to nearly equal to the calculated value of the bar with semi-circular notches.View full abstractDownload PDF (1081K) -
Masayuki IKEDA, Tsuneo NAKAMURA1966 Volume 32 Issue 379 Pages 539-544
Published: August 05, 1966
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn this report, frequency analysis on some lapped surface roughness are made. The profiles of turning specimens recorded on a magnetic tape are obtained using the stereo type pick-up which is rewired so as to measure the vertical displacement of its stylus.
The conclusions obtained are as follows;……
1) When logarithmic plot of frequency is taken on the axis of abscissa, frequency analysis curves of lapped surface roughness, that are called spectrum curves, show the Gaussian distribution approximately.
This fact concurs with some results of other investigations on periodicity of lapped surface roughness
2) The frequency corresponding to the peak position of Gaussian curves is considered to be the mean frequency.
3) A constant functional relation between the output voltage at the mean frequency and the center line average roughness is derived.View full abstractDownload PDF (938K) -
On Superfinishing of GraniteSeiki MATSUI1966 Volume 32 Issue 379 Pages 545-550
Published: August 05, 1966
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSAt first, the scratching test of granite was performed to observe the cutting process by a single grain. Next, the grinding test of granite was performed to study the pre-machining process of superfinishing. Finally, the process of granite superfinishing by vitrified bond wheels and resinoid bond wheels was investigated experimentally. In this experiment, the stock removal, the superfinishing resistance, the surface roughness were measured.
The main results of experiments are as follows.
1) Under light load the shape of scratched traces on granite was similar to that on metal.
2) Silicon carbide wheels were more suitable for grinding process of granite than aluminum oxide wheels.
3) The superfinishing resistance of granite was expressed as the sum of two terms, ploughing and frictional. This ploughing force was proportional to the stock removal. Under the conditions used, the apparent coefficient of friction between wheel and work, μ, was about 0.11 and the experimental constant C' equivalent to the coefficient of piling-up in metal superfinishing about 1.
4) The value of surface roughness of granite ground by silicon carbide wheels was about 3 μ Hmax.5) The value of surface roughness of granite roughly superfinished was about 1 μ Hmax and the value finely superfinished under about 1 μ Hmax.
6) Superfinishing process of granite was performed successfully in place of lapping process.View full abstractDownload PDF (6372K) -
The Sliding Phenomenon of Abrasive Grain at the Beginning of CutKenjiro OKAMURA, Toshikatsu NAKAJIMA1966 Volume 32 Issue 379 Pages 551-557
Published: August 05, 1966
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn the metal cutting with abrasive grain, the metal that is being cut is elastically deformed from the beginning of cut to a certain distance and then plastically deformed and finally cut.
It is considered that the sliding phenomenon of abrasive grain on the workpiece surface in the region of elastic deformation has an important effect upon the cutting mechanism of abrasive grain.
In this report, the sliding length of abrasive grain and the critical normal force in the point at which workpiece enters from the elastic region into the plastic, are theoretically analyzed in the case that the depth of cut increases linearly.
It was, in consequence, recognized that the sliding length of abrasive grain was a function of the angle with which abrasive grain cut into workpiece at the beginning of cut, the cutting speed, the wear land width in clearance surface of cutting edge and the spring constant of grinding wheel.View full abstractDownload PDF (1233K) -
Ryôzô FURUICHI, Kentaro TAMAMURA1966 Volume 32 Issue 379 Pages 558-569
Published: August 05, 1966
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSHigh Silicon aluminum alloys containing 17-25% Si have excellent mechanical and physical properties. Those allys have been said, however, to be difficult to machine.
In this experiment, the machinability of the alloy was investigated with reference to the tool wear and the surface finish.
The alloys containing 18.819.8% Si were cut with carbide tools having the tip of various grade.
Chip disposal is comparatively easy, but flank wear of the tool is very rapid.
At the cutting edge of the tool, adhesion of the work material occurs and it takes the shape of the flank build-up known in the machining of nodular cast iron.
The tool rake angle of 2535 degrees and side relief angle of 510 degrees are recommended for cutting of the alloy.
Cutting fluids are effective in reducing tool wear, but not necessarily effective in reducing cutting forces and surface roughness.
In high speed cutting above 400m/min, a smooth finished surface is obtained and on the other hand, tool life is too short.
It was revealed that there is a suitable range of the feed in the cutting of such alloys as the high silicon aluminum alloy which is composed of hard primary crystals and soft matrix.View full abstractDownload PDF (8603K) -
Sadatosi INADA, Susumu KASEI, Teisuke SATO1966 Volume 32 Issue 379 Pages 570-576
Published: August 05, 1966
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSWhen we machine a non-circular section with lathe, for example, relieving of milling cutter blank, turning of polygonal profile coupling and boring of rotary engine casing, the rake angle of cutting tool varies continuously and periodically.
This report deals with the features of such a specialized cutting compared with those of ordinary cutting.
The orthogonal cutting mechanism applied to the experimental results is based on the concept of the theory of the transitional deformation range (i.e. the “flow region” which exist between the rigid region of workpiece and the plastic region of steady chip).
The thickness of chip t2, the length of chip contact l, the cutting resistance Fh and Fv, the frictional angle β, the ending boundary angle φ2, the starting boundary angle φ1, the chip thick-ness ratio rc and the strain of chip ε2 are compared with those of ordinary cutting.
The conclusions are as follows : The cutting resistance and aspect of frictional angle variation at these specialized cutting are differ from those of ordinary cutting.View full abstractDownload PDF (1386K) -
On the Relations between Back Scattering and Loading, Shape of Pore and Conditions of LoadingHidemi SHIGEMATSU1966 Volume 32 Issue 379 Pages 577-584
Published: August 05, 1966
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn preceding papers, we studied on the method of measurment of loading of grinding wheel by means of the back scattering of β-rays, and the relation between back scattering and grinding wheels.
This article describes the relations between back scattering and loading, shape of pore and conditions of loading.
The results obtained are :
(1) The conditions of loading of wheel face are classified as adhesion or filling types.
(2) The shape of pore can be classed as round, angular and polygon types.View full abstractDownload PDF (3636K) -
[in Japanese]1966 Volume 32 Issue 379 Pages 585-591
Published: August 05, 1966
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1545K) -
1966 Volume 32 Issue 379 Pages 591
Published: 1966
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (148K)
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