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Volume 21, Issue 248
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[in Japanese], [in Japanese]1955 Volume 21 Issue 248 Pages 415-419
Published: 1955
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESS -
Hiroshi SAITO1955 Volume 21 Issue 248 Pages 419-423
Published: 1955
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn the study of this piercing test, four piercing tools, 4 mm, 3 mm, 2 mm, and 1.5mm in diameter, and Amsler testing machine are employed. The autographic recorder consists of dial gauge with a thin disc having slits, photo-cell, photo-electric current amplifier, and the others. By this apparatus, the approximate piercing diagrams are recorded on the Amsler recording drum. The specimens are of mild steel and brass of 4 mm in thickness.
The results obtained are as follows.
1, Minimum value of penetration of punch appears when tool clearance is between 5 and 10% of the stock thicknees.
2, Nominal piercing stress decreases gradually in proportion to the increase of tool clearance.
3, In order to obtain fine shaped hole, it is preferable that tool clearance has to be about 2% of the stock thickness.
4, The smallest diameter of piercing punch for practical use is about 1.5mm for the mild steel stock and about 2 mm for the brass stock.
5, And others.View full abstractDownload PDF (735K) -
K. OGAWA, E. TAKEUCHI1955 Volume 21 Issue 248 Pages 424-427
Published: 1955
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSBasing on the experiments described in our first report, the slip abrasion phenomena were examined by using cylinder liner cast iron quenched by high frequency surface hardening. Abrasive pressure and velocity were kept 30kg/cm2 and 1.05m/sec respectively. Abrasion character of specimens quenched by high frequency was independent of the casting method. Further, tempering at 300°C caused better results concerning abrasion resistance.View full abstractDownload PDF (881K) -
Wear Properties of 70:30 AlloysFusao HAYAMA1955 Volume 21 Issue 248 Pages 427-432
Published: 1955
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThe wear loss of 70:30 brass sliding on steel shaft(hardened to HRC 6062)has been measured. Pure α-brass does not scarcely wear at up to the speed of 150 cm/s, and while the hardened steel shaft wears by lapping with the powder of Fe (Fe2 O3) which has been slightly seized from the steel surface in the first step. The wear properties of α-brasses containing Pb are varied by Pb content. The most brittle material among these Pb-brasses wears in such a manner as 60:40 brass does, and the wear loss suddenly increases more than that of brass at a certain rubbing speed. The fact that the wear of β-phase alloy decreases with the rising of rubbing speed, coincides with that the β-strUcture becomes tough under the high temperature.View full abstractDownload PDF (1558K) -
[in Japanese], [in Japanese]1955 Volume 21 Issue 248 Pages 433
Published: 1955
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (180K) -
[in Japanese]1955 Volume 21 Issue 248 Pages 434-438
Published: 1955
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSDownload PDF (1203K) -
1955 Volume 21 Issue 248 Pages 445-446
Published: 1955
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (471K)
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