Hollow salt core and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10350673-B2
Application number	US-201715622641-A
Country	US
Kind code	B2
Filing date	Jun 14, 2017
Priority date	Mar 30, 2017
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A method of manufacturing a hollow salt core may include an injection operation, in which molten salt including an ingredient of a salt core is injected into a mold through pressurization; a primary maintenance operation, in which a pressure is maintained in the mold including the injected molten salt; a primary decompressing operation, in which a portion of the molten salt maintained with the pressure is collected in the mold through decompression of the mold; a secondary maintenance operation, in which a pressure is maintained in the mold including the residual molten salt after the primary decompressing operation; and a secondary decompressing operation, in which the pressure of the mold is decreased after the secondary maintenance operation.

First claim

What is claimed is:

1. A method of manufacturing a hollow salt core, comprising:
an injection operation, in which molten salt including an ingredient of a salt core is injected into a mold through pressurization;
a primary maintenance operation, in which a pressure is maintained in the mold including the injected molten salt;
a primary decompressing operation, in which a portion of the molten salt maintained with the pressure is collected in the mold through decompression of the mold;
a secondary maintenance operation, in which a pressure is maintained in the mold including a residual molten salt after the primary decompressing operation; and
a secondary decompressing operation, in which the pressure of the mold is decreased after the secondary maintenance operation.

2. The method of claim 1 , wherein a temperature of the molten salt is 650° C. to 750° C.

3. The method of claim 1 , wherein a temperature of the mold is 300° C. to 400° C.

4. The method of claim 1 , wherein the primary maintenance operation is maintained for 20 seconds to 40 seconds.

5. The method of claim 1 , wherein the secondary maintenance operation is maintained for 5 seconds to 30 seconds.

6. The method of claim 1 , wherein the method of manufacturing the hollow salt core is low pressure casting.

7. A hollow salt core comprising a thickness of 4 mm to 10 mm, wherein the hollow salt core has a transverse rupture strength of 20 MPa to 32 MPa, and the hollow salt core has a shrinkage rate between 0.56% to 0.60%.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Lee Cheol-Ung
• Lee Ji-Yong

Classifications

• B22C9/105 Primary

  Salt cores · CPC title

• B22D18/04

  Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould · CPC title

• B22C13/16 Primary

  by pressing through a die · CPC title

• B22D17/22 Primary

  Dies (manufacture, see the appropriate class, e.g. B23P15/24); Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies · CPC title