Sand for casting mold, manufacturing method for sand casting-mold, and core for metal casting

Patent metadata

Field	Value
Publication number	US-9789533-B2
Application number	US-201314442233-A
Country	US
Kind code	B2
Filing date	Nov 8, 2013
Priority date	Nov 19, 2012
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

Sand for a casting mold including sand, a binder, and an inorganic compound particle having poor water solubility and generating a gas, which is at least one of water vapor or carbon dioxide gas, by heat from a molten metal.

First claim

What is claimed is:

1. Sand for a casting mold, comprising:
sand particles;
a binder;
foam generated by foam production; and
inorganic compound particles:
having poor water solubility;
generating at least one of water vapor or carbon dioxide gas by heat from a molten metal;
having a volume average particle diameter smaller than that of the sand particles; and
having a viscosity of from 0.5 Pa·s to 10 Pa·s.

2. The sand for a casting mold according to claim 1 , wherein the inorganic compound particles comprise at least one selected from a group consisting of a carbonate and a hydroxide.

3. The sand for a casting mold according to claim 1 , wherein the binder is water soluble and has a foam-producing ability.

4. The sand for a casting mold according to claim 3 , comprising, as the binder, at least one selected from a group consisting of an anionic surfactant, a nonionic surfactant and an amphoteric surfactant.

5. The sand for a casting mold according to claim 4 , wherein a total added amount of the anionic surfactant, the nonionic surfactant and the amphoteric surfactant is from 0.005% by mass to 0.1% by mass with respect to the sand.

6. The sand for a casting mold according to claim 1 , comprising a water soluble sodium silicate as the binder.

7. The sand for a casting mold according to claim 6 , wherein an added amount of the sodium silicate is from 0.1% by mass to 20.0% by mass with respect to the sand.

8. The sand for a casting mold according to claim 1 , comprising, as the binder, at least one selected from a binder group (A) consisting of polyvinyl alcohol and derivatives thereof, saponin, starch and derivatives thereof, and other sugars.

9. The sand for a casting mold according to claim 8 , wherein a total added amount of the binder contained in the binder group (A) is from 0.1% by mass to 20.0% by mass with respect to the sand.

10. The sand for a casting mold according to claim 1 , which is used for casting of aluminum or an aluminum alloy.

11. The sand for a casting mold according to claim 1 , wherein
the inorganic compound particles comprise at least one selected from the group consisting of magnesium carbonate, magnesium hydroxide, and aluminum hydroxide.

12. The sand for a casting mold according to claim 11 , wherein the binder is water soluble and has a foam-producing ability.

13. The sand for a casting mold according to claim 12 , comprising, as the binder, at least one selected from a group consisting of an anionic surfactant, a nonionic surfactant and an amphoteric surfactant.

14. The sand for a casting mold according to claim 13 , wherein a total added amount of the anionic surfactant, the nonionic surfactant and the amphoteric surfactant is from 0.005% by mass to 0.1% by mass with respect to the sand.

15. The sand for a casting mold according to claim 11 , comprising a water soluble sodium silicate as the binder.

16. The sand for a casting mold according to claim 15 , wherein an added amount of the sodium silicate is from 0.1% by mass to 20.0% by mass with respect to the sand.

17. The sand for a casting mold according to claim 11 , comprising, as the binder, at least one selected from a binder group (A) consisting of polyvinyl alcohol and derivatives thereof, saponin, starch and derivatives thereof, and other sugars.

18. The sand for a casting mold according to claim 17 , wherein a total added amount of the binder contained in the binder group (A) is from 0.1% by mass to 20.0% by mass with respect to the sand.

19. The sand for a casting mold according to claim 11 , which is used for casting of aluminum or an aluminum alloy.

Assignees

• Sintokogio Ltd
• Toyota Motor Co Ltd

Inventors

• Aoki Tomohiro
• Kato Yusuke
• Matsumoto Takehiko
• Mori Kenichiro
• Zenpo Toshihiko
• Suda Tomokazu
• Mitsutake Masaomi
• Maegawa Takumi
• Nakayama So
• Morikawa Masashi
• Watanabe Hirotsune

Classifications

• B22C9/10

  Cores; Manufacture or installation of cores {(breaker cores B22C9/084)} · CPC title

• B22C9/02

  Sand moulds or like moulds for shaped castings · CPC title

• B22D21/04

  Casting aluminium or magnesium {(no material; see B22D21/007)} · CPC title

• B22C1/02 Primary

  characterised by additives for special purposes, e.g. indicators, breakdown additives · CPC title

• B22C1/12

  for manufacturing permanent moulds or cores · CPC title