Method for manufacturing cast product

Patent metadata

Field	Value
Publication number	US-12145196-B2
Application number	US-202418598875-A
Country	US
Kind code	B2
Filing date	Mar 7, 2024
Priority date	Mar 22, 2023
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

A method for manufacturing a cast product in which a core can be easily discharged from a casting roughly-shaped material is provided. A method for manufacturing a cast product according to the present disclosure includes: a step of hermetically sealing a casting roughly-shaped material formed by casting using a core in a container containing water; a step of heating the water contained in the container while keeping the casting roughly-shaped material hermetically sealed and thereby destroying the core while keeping a pressure inside the container at a pressure higher than an atmospheric pressure, and thereby forming core sand; and a step of discharging the core sand from the casting roughly-shaped material.

First claim

What is claimed is:

1. A method for manufacturing a cast product, comprising:
hermetically sealing a casting roughly-shaped material formed by casting using a core in a container containing water;
heating the water contained in the container while keeping the casting roughly-shaped material hermetically sealed and thereby destroying the core while keeping a pressure inside the container at a pressure higher than an atmospheric pressure, and thereby forming core sand; and
discharging the core sand from the casting roughly-shaped material,
wherein
the water contained in the container contains water glass, and
a concentration of the water glass in the water in the container is, by mass %, no lower than 3% and no higher than 5%.

2. The method for manufacturing a cast product according to claim 1 , wherein
the core is an inorganic core,
the inorganic core contains a binder and an aggregate, and
the binder contains water glass.

3. The method for manufacturing a cast product according to claim 1 , wherein in the forming of the core sand, the pressure inside the container is kept at 0.15 MPa or higher.

Assignees

• Toyota Motor Co Ltd

Inventors

• Hori Shoko
• Watanabe Hirotsune

Classifications

• B22D29/003 Primary

  using heat · CPC title

• B22D29/006 Primary

  by abrasive, water or air blasting · CPC title