公开(公告)号：JPH06122038A

公开(公告)日：1994-05-06

申请号：JP30302592

申请日：1992-10-15

Applicant: AGENCY IND SCIENCE TECHN

Inventor： YASUE KAZUO ,  NISHIO TOSHIYUKI

IPC: B22C9/03 ,  B22C9/02 ,  B29C33/38

Abstract: PURPOSE:To provide a vacuum molding process capable of manufacturing a casting cavity by forming a perfect film on a pattern in a simple process even for the pattern having thick and sharp parts. CONSTITUTION:Liquid resin for forming a film is coated on the surface of a pattern 23 and dried to form a non-permeable film 30 on the surface of the pattern 23, and a flask 33 is loaded on the film, and the refractory material powder 44 is packed in the flask. After the inside space of the flask 33 is evacuated, the porous pattern 23 is separated to make a casting cavity. In manufacturing the casting cavity where the non-permeable film 30 is coated on the surface of the pattern 23, the refractory material powder 44 is packed in the flask 33 loaded on the periphery of the film, the packed part is wrapped with the non-permeable film 45, the part where the refractory material is packed within the flask 33 is evacuated, and the part is separated from the pattern 23, the non-permeable film 30 to be coated on the surface of the pattern 23 is formed by coating the adhesive composed of the adhesive resin and drying it.

公开(公告)号：JPH0641674A

公开(公告)日：1994-02-15

申请号：JP21820092

申请日：1992-07-24

Applicant: AGENCY IND SCIENCE TECHN

Inventor： YASUE KAZUO ,  NISHIO TOSHIYUKI

IPC: B22F3/10 ,  B22F9/08 ,  C22C33/02

Abstract: PURPOSE:To manufacture cast iron in which graphite ms uniformly and finely dispersed into a matrix structure and excellent capable of easily obtaining a pearlitic matrix regardless of its thickness. CONSTITUTION:The melt of iron stock having, by weight, 2 to 6% carbon content and 0.8% or less silicon content is rapidly atomized and solidified to form cast iron powder contg. no free carbon, and after that, it is compacted and 15 then baked at 800 to 1000 deg.C for 1 to 3hr in a nonoxidizing atmosphere to manufacture the superfine graphite-contg. cast iron green compact.

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.

公开(公告)号：JPS61221310A

公开(公告)日：1986-10-01

申请号：JP6267885

申请日：1985-03-26

Applicant: AGENCY IND SCIENCE TECHN

Inventor： YASUE KAZUO ,  NISHIO TOSHIYUKI ,  KOSAKA MINEO

IPC: B01J12/02 ,  B01J2/04 ,  B01J10/00 ,  B01J19/10 ,  B05B17/06 ,  B22F9/06 ,  B22F9/12 ,  C01B13/32 ,  C01B21/06 ,  C01B31/30 ,  C01F7/42

Abstract: PURPOSE:To produce pulverous powder of a metal or alloy which has the narrow range of a grain size distribution and is stable in grain shape by dispersing uniformly an inert gas or reducing gas fed into the melt of the metal or alloy into a fine foam state by making use of ultrasonic oscillation. CONSTITUTION:A wire-shaped melting material 11 made of the metal or alloy fed by feed rollers 12 is heated and melted by a heater 2. The melt thereof is stored in a channel part 4 in a crucible 3. The inert gas or reducing gas such as Ar or H2 is then supplied from a gas supply part 10a of a gas flow passage 10 to pouring basin part 5. A horn 8 is vertically oscillated by an ultrasonic oscillation device 7 at the same instant. Then the above-mentioned gas is sheared to fine foam in the stage of passing through a space 9. The foam disperses and rises in the channel part 4. Cavitation is induced in the foam by the ultrasonic oscillation at the focus of the recessed surface 8a of the horn 8, by which the melt is atomized. The mist thereof is sucked by a water cooled impeller 15 rotating at a high speed, by which the mist is solidified. The solidified metal is recovered as the pulverous powder into a casing 16.