Method and installation for low pressure die casting in a mould ceramic casting die
US6422293B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1999 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Nov 18, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D18/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Placed in a box (1) is a ceramic shell (21) delimiting a casting space (22), the shell being surrounded by a mass of binder-free sand (23). The casting space is connected to a source (4) of liquid metal located underneath, in which are applied, in succession, a pressure (P1) bringing the liquid to the threshold of the casting space (22), a pressure (P2) slightly greater than that necessary for filling this space, and then a marked overpressure (P3); finally, the pressure is brought back down to the first value (P1). When the casting space has been filled, an underpressure is created in the space containing the mass of sand (23) in order to prevent any deformation of the shell (21) due to the overpressure (P3), at least until the formation of a metal skin against the shell and at most until the start of the reduction in the overpressure in the source (4) of liquid metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.