EP0249936A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for molding powders
Assignee: JFE Engineering Corp
•
Filing: 1987-06-16
•
Granted: —
•
Expires: 2007-06-16
Abstract
Abstract A method for molding powders which comprises the steps of introducing a thin-wall resilient mold (9) inside a ventilative mold support (6), reducing outside pressure of the ventilative mold support to less than the atmospheric pressure (760 Torr), putting the thin-wall resilient mold exactly close to the inside wall of the ventilative mold support, supplying material powders (13) into the thin-wall resilient mold, exhausting air existing in the voids which the material powders form, and taking the ventilative mold support apart to apply cold isostatic press treatment to the thin-wall resilient mold. The shape of the thin-wall resilient mold is similar to the shape of the ventilative mold support.
Inventors
- 👤 Hiroaki Pat&Lic Quality Standards Dept. Nishio
- 👤 Jun Pat&Lic Quality Standards Dept. Harada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 08:48
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/1216; B22F3/1233; B22F3/02; B22F3/04; B30; B30B; B30B11/00; B30B11/001; Y; Y10; Y10S; Y10S264/00; Y10S264/78; Y10S425/00; Y10S425/014
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
137 words
A method for molding powders which comprises the steps of: reducing the pressure outside a ventilative mold support (7), by operation of a vacuum pump (12), to less than the atmospheric pressure (760 Torr), to put a thin-wall resilient mold (9) close to the inside wall of the ventilative mold support; supplying material powders into the thin-wall resilient mold; exhausting air existing in the voids which the material powders form; sealing the thin-wall resilient mold; and taking out the thin-wall resilient mold filled with the material powders by taking the ventilative mold support, to apply cold isostatistic press treatment to the thin-wall resilient mold; characterized by comprising introducing the thinwall resilient mold similar to an inside shape of the ventilative mold support and to a shape of a green compact into the inside of the mold support.
Claim 2
Independent Claim
137 words
A method for molding powders which comprises the steps of: reducing the pressure outside a ventilative mold support (7), by operation of a vacuum pump (12), to less than the atmospheric pressure (760 Torr), to put a thin-wall resilient mold (9) close to the inside wall of the ventilative mold support; supplying material powders into the thin-wall resilient mold; exhausting air existing in the voids which the material powders form; sealing the thin-wall resilient mold; and taking out the thin-wall resilient mold filled with the material powders by taking the ventilative mold support, to apply cold isostatistic press treatment to the thin-wall resilient mold; characterized by comprising introducing the thinwall resilient mold similar to an inside shape of the ventilative mold support and to a shape of a green compact into the inside of the mold support.
Claim 3
Dependent Claim
22 words
A method according to claim 1, characterized in that said thin-wall resilient mold includes being a resilient mold made of natural rubber.
Claim 4
Dependent Claim
24 words
A method according to claim 1 or 2, characterized in that said thin-wall resilient mold includes being a resilient mold made of synthetic rubber.
Claim 5
Dependent Claim
29 words
A method according to claim 3, characterized in that said synthetic rubber is at least one selected from the group consisting of stylane-butadiene rubber, polyisoprane rubber and isobutylane-isoprane rubber.
Claim 6
Dependent Claim
23 words
A method according to claim 1,2 or 3, characterized in that said thin-wall resilient mold having a thickness of 50 to 2000 µm.
Claim 7
Dependent Claim
18 words
A method according to claim 5, characterized in that said thickness includes being of 100 to 500 µm.
Claim 8
Dependent Claim
46 words
A method according to claim 1, 2, 3 or 5, characterized in that said thin-wall resilient mold is prepared by comprising the processes of: dipping a metallic pattern in latex to form a film over the metallic pattern; and heating the film over the metalic pattern.
Claim 9
Dependent Claim
46 words
A method according to claim 1, 2, 3 or 5, characterized in that said thin-wall resilient mold is prepared by comprising the processes of: dipping a metallic pattern in latex to form a film over the metallic pattern; and releasing the metallic pattern to the air.
Claim 10
Dependent Claim
44 words
A method according to claim 1, 2, 3, 5, 7 or 8, characterized in that said ventilative mold support is at least one selected from the group consisting of plastics, wood, metal, ceramics, and composite material of ceramic and metal, and provided with vent-holes.
Claim 11
Dependent Claim
30 words
A method according to claim 9, characterized in that said plastics includes at least one selected from the group consisting of polyamide resin, ABS resine, AS resin and urethane resin.
Claim 12
Dependent Claim
27 words
A method according to claim 9, characterized in that said metal includes at least one selected from the group consisting of copper alloy, stainless steel and alminium.
Claim 13
Dependent Claim
24 words
A method according to claim 9, characterized in that said ceramics includes at least one selected from the group consisting of almina and silica.
Claim 14
Dependent Claim
19 words
A method according to claim 9, characterized in that said ventilative mold support includes being made of porous substances.
Claim 15
Dependent Claim
17 words
A method according to claim 13, characterized in that said porous substances includes gypsum or molding sand.
Claim 16
Dependent Claim
51 words
A method according to claim 1, 2, 3, 5, 7, 8 or 9 characterized in that said step of exhausting air includes reducing pressure inside the thin-wall resilient mold to less than the pressure outside the ventilative mold support, the pressure inside the thin-wall resilient mold being 100 Torr or less.
Claim 17
Dependent Claim
22 words
A method according to claim 15, characterized in that said pressure inside the thin-wall resilient mold includes being 10 Torr or less.
Claim 18
Dependent Claim
54 words
A method according to claim 1, 2, 3, 5, 7, 8, 9 or 15, characterized in that said step of sealing the thin-wall resilient mold includes incresing the pressure outside the ventilative mold support to the atmospheric pressure (760 Torr), empty room (19) of the upper part of the thin-wall resilient mold being sealed.
Claim 19
Dependent Claim
47 words
A method according to claim 1, 2, 3, 5, 7, 8, 9, 15 or 17, characterized in that said step of applying cold isostatistic press treatment includes increasing isostatic pressure to 2000 to 4000 atm. for the cold isostatistic press treatment, when material powders are ceramic powders.
Claim 20
Dependent Claim
45 words
A method according to claim 1, 2, 3, 5, 7, 8, 9, 15 or 17, characterized in that said step of applying C.I.P. treatment includes increasing isostatic pressure to 2000 to 6000 atm. for the cold isostatic press treatment, when material powders are metallic powders.
Claim 21
Dependent Claim
32 words
A method according to claim 1, 2, 3, 5, 7, 8, 9, 15, 17, 18 or 19, characterized in that said material powders includes spherical powder particles treated in a granula form.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.