All issues
Volume 22, Issue 262
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese]1956 Volume 22 Issue 262 Pages 499-502
Published: December 05, 1956
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (992K) -
Change of Forces in Through Wheel Coolant GrindingKenji SATO1956 Volume 22 Issue 262 Pages 503-507
Published: December 05, 1956
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSUsing the appaiatus reported in the previous paper, the author measured the grinding forces with "through wheel coolant" supply. The pieces of annealed carbon steel (Hv 132) and hardened high speed steel (Hv 800) were ground with various coolants ; water, emulsion, kerosene and soybean oil, besides dry grinding reference. The results obtained are as follows
:1) Specific grinding energy varies remarkably with the change of coolant which is fed through the wheel. In grinding annealed carbon steel pieces by a A46N wheel, the specific grinding energy with soybean oil is about half of that with water or dry grinding, as shown in Table 1.
2) Analysing the tangential grinding forces in the way reported in the previous paper, the values of the coefficient of friction in grinding are determined as shown in Table 2. When soybean oil is used, they become as small as one third of those in dry grinding.
3) Specific shearing forces are calculated numerically as pure shearing forces of chips. For hardened high speed steel, they are about 4000 kg/mm2 ; and for annealed carbon steel, they are about 2000 kg/mm2.
4) Experimental formulae representing the grinding forces are introduced for various coolants and work materials. And also the ratios of the shearing terms to the total forces are calculated as shown in Fig. 8.View full abstractDownload PDF (3325K) -
Tsuneo NAKAMURA1956 Volume 22 Issue 262 Pages 507-512
Published: December 05, 1956
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn this paper I classified the reflecting image methods among surface measurements, and described the properties of the reflecting image. The definition of the reflecting image has relations with incident angle (φ), and the distance (Δb) between the test surface and the pattern. These relations depend on the microscopic surface shape, and are explained from the amounts of the specular and diffused reflection light.View full abstractDownload PDF (1076K) -
Hiroshi SAITO1956 Volume 22 Issue 262 Pages 512-516
Published: December 05, 1956
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThis report describes the sutdy of piercing test by punches, 4mm in diameter, with wedgeshaped and coniform ends. Wedge and cone angles of punches are varied between 0° and 45° Specimens are steel and brass sheets of 4 mm and 1 mm in thickness.
Then following results are gained.
1) In piercing a sheet of 4 mm in thickness, the increase of primary loads at wedgeshaped and coniform end punches is smaller than at flat end punches, and penetration at former is larger. The larger the wedge and cone angles of punches, the more remarkable those phenomena.
2) The maximum load in piercing a sheet of 4 mm in thickness, is generally larger in case of wedge-shaped and coniform end punches than of flat end punches.
In the test of wedge-shaped punches with angles larger than 15°, the maximum load is approximately constant. In the test of coniform end punches, the maximum value of the maximum load exists at a certain cone angle in the maximum load-wedge, cone angle diagram. On piercing a sheet of 1 mm in thickness, corresponding to a certain value of the wedge angle, the maximum loads begin to decrease suddenly by the effect of shear angle, and at a certain value of the coniform angle, the maximum value of the maximum load exists.
3) And others.View full abstractDownload PDF (920K) -
Atsuomi IGATA, Kiyoshi OISHI1956 Volume 22 Issue 262 Pages 517-519
Published: December 05, 1956
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSVarious methods have been tried already in sharpening the various kinds of cutleries by means of electrolytic polishing.
We recently attempted to sharpen the edgedcircular tool by the the same means, dipping the lower part of the disc of the cutlery in the electrolytic solution and giving slow rotation about the principal axes of it.
The final form of the edge estimated theoretically coincides with that gained practically. This form is found very suitable for particular purposes.View full abstractDownload PDF (662K) -
Fusao HAYAMA1956 Volume 22 Issue 262 Pages 520-524
Published: December 05, 1956
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe wear rate at the initial state of β mono-crystal is more or less larger than that of polycrystalline brass, and to which the coefficient of friction has similar relation, too. But, as to the wear at the the constant state, the difference between the wear rates for monocrystal and for polycrystal is scarcely appreciable.
The presence of slightly traceable β in α-brass has considerably bad effect on its wearresistivity.
The special Pb-brass in which the grains of Pb are found mostly at the grain boundary wears more than common Pb-brass.View full abstractDownload PDF (1709K) -
[in Japanese]1956 Volume 22 Issue 262 Pages 525-530
Published: December 05, 1956
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSDownload PDF (1665K) -
1956 Volume 22 Issue 262 Pages 535-537
Published: December 05, 1956
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (630K)
- |<
- <
- 1
- >
- >|