# US 2014/0190653 A1 · Method for producing investment castings

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- Number: US 2014/0190653 A1
- Document ID: US20140190653A1
- Status: Published application
- Kind: A1
- Application number: 14/237,360
- Filed: 2012-08-10
- Published: 2014-07-10
- Earliest claimed: 2011-08-19
- Assignees: Instytut Odlewnictwa
- Inventors: Edward Czekaj; Aleksander Karwinski
- Web page: https://patentgrep.com/patent/US20140190653A1

## CPC

- B22D 27/04: Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D 27/045: {Directionally solidified castings}
- B22D 30/00: Cooling castings, not restricted to casting processes covered by a single main group (accessories for cooling cast stock in continuous casting of metals B22D11/124; controlling or regulating processes or operations for cooling cast stock or mould in continuous casting of metals B22D11/22; chill casting B22D15/00)
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)

## Abstract

A method for producing investment castings, preferably in ceramic moulds, from alloys based on Al, Mg, Cu, Zn and Fe, characterised in that the ceramic mould is baked at temperatures of 800-1000° C. for 2-4 hours, then the mould is cooled to a temperature of 20-950° C. and is held at this temperature for 10-40 minutes, then it is poured with liquid alloy overheated by from 50 to 200° C. above the initial melting point and after a lapse of 10-100 seconds, the mould is immersed at a fixed or variable speed in a liquid cooling medium, which is a 1-99 volume percent aqueous solution of liquid polymer at a temperature of 15-85° C. The liquid polymer is a polymer of the PAG or PVP, or ACR, or PEO type. The ceramic moulds made of aluminosilicate, or high alumina refractory materials, especially based on synthetic sand, for example Molochite, are used.

## Claims

### Claim 1

A method for producing investment castings, in ceramic moulds, from alloys based on Al, Mg, Cu, Zn and Fe, comprising:
baking a ceramic mould at a temperature of 800-1000° C. for 2-4 hours;
cooling said mould to a temperature of 20-950° C., and holding said mould at this temperature for 10-40 minutes;
pouring into said mould a liquid alloy overheated by from 50 to 200° C. above the initial melting point and after a lapse of 10-100 seconds; and
immersing said mould at a fixed or variable speed in a liquid cooling medium, the said liquid cooling medium being a 1-99 volume percent aqueous solution of liquid polymer at a temperature of 15-80° C.

### Claim 2 (depends on 1)

A method for producing investment castings according to claim 1, characterised in that the liquid polymer is a polymer of the PAG, or PVP, or ACR, or PEO type.

### Claim 3 (depends on 1)

A method for producing investment castings according to claim 1, characterised in that the ceramic moulds made of aluminosilicate or high alumina refractories, especially based on synthetic sand, for example Molochite, are used.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising:
pouring an aluminum alloy into said mould.

### Claim 5 (depends on 1)

The method according to claim 1, further comprising:
pouring a magnesium alloy into said mould.

### Claim 6 (depends on 1)

The method according to claim 1, further comprising:
pouring a copper alloy into said mould.

### Claim 7 (depends on 1)

The method according to claim 1, further comprising:
pouring an iron alloy into said mould.