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公开(公告)号：JPH02236444A
公开(公告)日：1990-09-19
申请号：JP5627789
申请日：1989-03-10
Applicant: AGENCY IND SCIENCE TECHN , HIROSHIMA PREFECTURE
Inventor： YASUE KAZUO , NISHIO TOSHIYUKI , YAMADA YASUO , SUZUKI HIROSHI
Abstract: PURPOSE:To rapidly execute temp. control and to determine a constant-temp. transformation curve of high accuracy by using a cooling medium having a large cooling power and making transformation measurement by a non-contact type system using magnetic force. CONSTITUTION:A high-temp. heating furnace 19 is heated up to the austenite area of about 900 deg.C and a sample is hung by a stainless steel wire 22 down to the position shown by 8b and is fixed by means of a clip 23. After the sample is held for a prescribed period of time, the clip 23 is removed to allow the sample to fall into a salt bath. The falling time of this time is recorded by a photoelectric tube and is determined as the time for starting the measurement of a change in the magnetic force. The sample is immediately cooled and the constant- temp. transformation is started. The magnetism of the sample is increased by the transformation in such a manner and the loss of weight generated by attracting a magnet 2 is indicated on a balance 1 and is displayed on a recorder. Since the balance 1 is of an electromagnetic balance type, the position of a tray is not displaced in a vertical direction even if the load changes. the distance between the sample and the magnet 5 does not, therefore, change and the influence on the load is not affected. The constant-temp. transformation curve of the high accuracy is obtd. in this way.
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公开(公告)号：JPH02125199A
公开(公告)日：1990-05-14
申请号：JP27650088
申请日：1988-11-01
Applicant: AGENCY IND SCIENCE TECHN
Inventor： ASAHINA TADASHI , TAJIRI KOJI , NISHIO TOSHIYUKI , YAMADA YASUO
Abstract: PURPOSE:To sharply reduce the liquid nitrogen usage quantity by feeding nitrogen gas in a Dewar bottle and making the inner pressure the same as the pressure of the ambient air or slightly higher at the time of the ordinary operation in the Dewar bottle for a charged particle detector or the like. CONSTITUTION:An object to be cooled 2 in a Dewar bottle 3 is immersed in liquid nitrogen 1, and the cold end 10 of a helium gas circulation type adiabatic expansion refrigerator is fitted to the upper port of the Dewar bottle 3 with an O-ring seal 9. After the operation of the refrigerator is started, the nitrogen gas of a nitrogen gas cylinder 12 is fed into the Dewar bottle 3 while being controlled by a pressure reducing flow control valve 11 so that the inner pressure is made the same as the pressure of the ambient air or slightly higher. The valve 11 is closed after the temperature equilibrium is attained, and the operation of only the refrigerator is continued. The usage quantity of liquid nitrogen is sharply reduced, and the maintenance and management can be simplified.
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公开(公告)号：JPS63105907A
公开(公告)日：1988-05-11
申请号：JP25254686
申请日：1986-10-23
Applicant: AGENCY IND SCIENCE TECHN
Inventor： YASUE KAZUO , YAMADA YASUO , NISHIO TOSHIYUKI , KOSAKA MINEO
IPC: B22F9/08
Abstract: PURPOSE:To enable continuous production and to improve the productivity by vertically moving the oscillating surface of an ultrasonic oscillator submerged in a molten metal so that the molten metal is dipped up, atomized and scattered by emergence and submergence. CONSTITUTION:The upward oscillating surface 5a of the oscillating part 5 of an ultrasonic oscillator 4 placed under a crucible 2 for melting a metal is submerged in a molten metal 3 in the crucible 2 through the bottom 11 of the crucible 2 to carry out ultrasonic oscillation. The whole oscillator 4 including the oscillating part 5 is vertically moved by a vertical driving mechanism 8. The oscillator 4 and the mechanism 8 are displaced by a vertical regulating mechanism 9. The molten metal 3 is dipped up, atomized and scattered by the oscillating surface 5a and the resulting solidified fine metal powder is recovered by a recovering mechanism 10.
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