Method for producing salt core

Patent metadata

Field	Value
Publication number	US-11453047-B2
Application number	US-202017067079-A
Country	US
Kind code	B2
Filing date	Oct 9, 2020
Priority date	Dec 23, 2019
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

A method for producing a salt core includes a step A of adding a saturated sodium chloride aqueous solution to a sodium chloride crystal that is granular, to prepare a slurry mixed material of sodium chloride and water, a step B of subjecting the slurry mixed material to pressure molding to obtain a molded article, and a step C of drying the molded article to remove moisture.

First claim

What is claimed is:

1. A method for producing a salt core, comprising:
a step A of adding a saturated sodium chloride aqueous solution to a sodium chloride crystal that is granular, to prepare a slurry mixed material of sodium chloride and water, where an amount of saturated sodium chloride aqueous solution is Ma parts by mass or more with respect to 100 parts by mass of sodium chloride crystal;
a step B of subjecting the slurry mixed material to pressure molding to obtain a molded article; and
a step C of drying the molded article to remove moisture,
wherein the Ma is determined based on a relationship between a mass of the saturated sodium chloride aqueous solution added with respect to 100 parts by mass of the sodium chloride crystal and a flow rate of a mixed material of sodium chloride and water when the mass added causes the flow rate to start increasing, found by increasing the mass added from 0 parts by mass.

2. The method for producing a salt core according to claim 1 ,
wherein the amount of saturated sodium chloride aqueous solution is Mb parts by mass or more with respect to 100 parts by mass of sodium chloride crystal,
wherein Mb is determined based on the relationship between the mass of the saturated sodium chloride aqueous solution added with respect to 100 parts by mass of the sodium chloride crystal when the flow rate first reaches a maximum rate, found by increasing the mass added from 0 parts by mass.

3. The method for producing a salt core according to claim 1 ,
wherein the pressure molding is performed with a liquid content of the slurry mixed material discharged from both sides in a pressure applying direction in the step B.

4. The method for producing a salt core according to claim 3 ,
wherein a die is provided with one or more discharge holes, and the liquid content is discharged through the one or more discharge holes.

5. The method for producing a salt core according to claim 1 ,
wherein a lubricant that does not dissolve in water, is applied onto an inner surface of a die and then the slurry mixed material is charged into the die to perform the pressure molding in the step B.

6. The method for producing a salt core according to claim 5 ,
wherein the lubricant has a dynamic viscosity of 20 to 120 mPa·s.

7. The method for producing a salt core according to claim 5 ,
wherein the die is provided with one or more discharge holes, and a liquid content of the slurry mixed material is discharged through the one or more discharge holes.

Assignees

• Toyota Motor Co Ltd

Inventors

• Tanaka Yoshitaka
• Nishida Masafumi
• Takahashi Yuta
• Kayashita Yuji

Classifications

• B22C3/00

  Selection of compositions for coating the surfaces of moulds, cores, or patterns · CPC title

• B22C9/105 Primary

  Salt cores · CPC title

• B22C1/00 Primary

  Compositions of refractory mould or core materials; Grain structures thereof (refractory materials in general C04B35/00); Chemical or physical features in the formation or manufacture of moulds · CPC title

• B22C9/106

  Vented or reinforced cores · CPC title

• B22C1/18

  of inorganic agents {(B22C1/162 takes precedence)} · CPC title