Production method of castings and gas-permeable casting mold
US10471498B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2019 |
| Grant date | Nov 12, 2019 |
| Priority date | — |
| Expiry date | Jan 30, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D27/13
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing a casting using a gas-permeable casting mold comprising a cavity composed of a production cavity and a flow path, the flow path comprising a sprue through which a gravity-poured melt flows downward, and a runner connecting the production cavity to the sprue, comprising gravity-pouring a metal melt in a volume smaller than that of the entire cavity and larger than that of the production cavity into the gas-permeable casting mold; supplying a gas through the sprue to push the metal melt in the flow path, thereby pushing the metal melt upward in the production cavity, so that the production cavity is filled with the metal melt; in a hypothetical equilibrium state in which a hypothetical liquid fills the production cavity by the supplied gas, setting the volume of the metal melt to be poured to be equal to the volume of the hypothetical liquid, such that the surface height hs of the hypothetical liquid remaining in the flow path after filling the production cavity, the height h1 of the lowest ceiling portion of the runner, and the height h2 of a point at which a ceiling of the runner is connected to the sprue, meet the relation of h2>hs>h1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.