EP0190680A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and casting plant for the production of metal castings
Assignee: ABB Norden Holding AB
•
Filing: 1986-01-31
•
Granted: —
•
Expires: 2006-01-31
Abstract
Abstract Method and casting plant for the production of metal castings in which the molten metal is fed from a heated container (1) to a mould (3) or to a smaller container via a pressure pipe (4), a pressure-generating means (2) and a suction pipe (5). According to the invention the temperature of the metal present in the pressure-generating means (2) is controlled by a heat-generating means (11) in order to maintain the metal at a temperature corresponding to or exceeding its melting point. The metal is present in molten state during its passage through the pressure-generating means (2) and the pipe system. A protective medium is brought to surround at least the pressure-generating means (2) to protect the same during operation and during a downtime period.
Inventors
- 👤 Sven-Erik Samuelson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:44
CPC Classifications
B; B22; B22D; B22D17/00; B22D17/20; B22D17/30; B22D35/00; B22D35/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
125 words
Method for the production of metal castings in which the molten metal is fed from a heated container (1) to a mould (3) or to a smaller container (17) via a pressure pipe (4), a pressure-generating means (2) and a suction pipe (5), characterized in that the temperature of the metal present in the pressure-generating means (2) is controlled by a heat-generating means (11) in order to maintain the metal at a temperature corresponding to or exceeding its. melting point, that the metal is present in molten state during its passage through the pressure-generating means (2) and the pipe system, and that protective medium is brought to surround at least the pressure-generating means (2) to protect the same during operation and during a downtime period.
Claim 2
Dependent Claim
125 words
Method for the production of metal castings in which the molten metal is fed from a heated container (1) to a mould (3) or to a smaller container (17) via a pressure pipe (4), a pressure-generating means (2) and a suction pipe (5), characterized in that the temperature of the metal present in the pressure-generating means (2) is controlled by a heat-generating means (11) in order to maintain the metal at a temperature corresponding to or exceeding its. melting point, that the metal is present in molten state during its passage through the pressure-generating means (2) and the pipe system, and that protective medium is brought to surround at least the pressure-generating means (2) to protect the same during operation and during a downtime period.
Claim 3
Dependent Claim
16 words
Method according to claim 1, characterized in that the protective medium consists of an inert gas.
Claim 4
Dependent Claim
31 words
Method according to claim 2, characterized in that the protective medium is brought to surround said pipes (4, 5) to protect these against oxidation during operation and during a downtime period.
Claim 5
Dependent Claim
42 words
Method according to any of claims 1 to 3, characterized in that the pressure generated by the pressure-generating means (2) is controlled by a torque-limited drive means (15) for the pressure-generating means (2), which is in the form of a pump means.
Claim 6
Dependent Claim
28 words
Method according to claim 4, characterized in that a torque set in the drive means (15) for the pump means (2) is monitored by a control system (16).
Claim 7
Dependent Claim
40 words
Method according to any of the preceding claims, characterized in that the molten metal is pressed by the pressure-generating means (2) to and through a mould (3) for the manufacture of metal rods for low-pressure casting of pieces of castings.
Claim 8
Dependent Claim
43 words
Method according to any of claims 1 to 5, characterized in that the molten metal is pressed by the pressure-generating means (2) into a container (17), which is provided with a discharge valve (18) for filling of the pressure chamber during die casting.
Claim 9
Dependent Claim
35 words
Method according to any of the preceding claims, characterized in that the rate of discharge from the container (1, 17) is increased by introducing a gas (21), under pressure, above the surface of the melt.
Claim 10
Dependent Claim
28 words
Method according to claim 8, characterized in that the oxidation of the surface of the melt in the container (17) is prevented by the gas (21) being inert.
Claim 11
Dependent Claim
28 words
Method according to any.of claims 7 to 9, characterized in that the maximum gas pressure above the surface of the melt is limited by a pressure-limiting valve (22).
Claim 12
Dependent Claim
27 words
Method according to claim 10, characterized in that the rate of outflow is controlled by setting the pressure of the gas on the surface of the melt.
Claim 13
Dependent Claim
92 words
Casting plant for carrying out the method according to any of claims 1-6, or 8 for the production of castings of a molten metal, which casting plant comprises a heated container (1) for molten metal and a pressure-generating means (2), being fed with molten metal from said container (1) via a pipe (5), characterized in that the casting plant comprises a heat-generating means (11) 'arranged to control the temperature of the metal present in the pressure-generating means (2) to maintain said metal at a temperature corresponding to or exceeding its melting point.
Claim 14
Dependent Claim
65 words
Casting plant according to claim 12, characterized in that the heat-generating means consists of a holding furnace (11), which completely surrounds the pressure-generating means (2), and that the space (12) of the holding furnace (11) is connected to a source (13) of an inert gas, and that said space (12) contains the inert gas which surrounds the pressure-generating means (2) for protecting it against oxidation.
Claim 15
Dependent Claim
47 words
Casting plant according to claim 12 or 13, characterized in that structural members of the casting plant which are in contact with the molten metal, such as at least the pressure-generating means (2) and preferably also said pipe (5), consist of graphite, carbon fibre-reinforced graphite, or ceramics.
Claim 16
Dependent Claim
122 words
Casting plant for carrying out the method according to any of claims 1-3, or 7-11 for filling of a pressure chamber during die casting, which casting plant comprises a heated container (1) for molten metal and a pressure-generating means (2) which is fed with molten metal from said container (1) via a pipe (5), and a container (17) which is fed with molten metal from the pressure-generating means (2) via a pressure pipe (4), characterized in that it comprises heat-generating means (7, 11, 19) arranged to control the temperature of the metal present in the pressure-generating means (2), the pipe (5) and the pressure pipe (4) in order to maintain the metal at a temperature corresponding to or exceeding its melting point.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.