Suction casting method and suction casting apparatus
US6311758A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 21, 1999 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Jun 21, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D18/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The first suction port is formed between a side die and the peripheral protrusion of an upper die. A release pin insertion hole is formed at the peripheral protrusion of the upper die which forms the upper end portion of the cavity. A release pin is inserted into the release pin insertion hole. The second suction port is formed between the insertion hole and the pin. Alternatively, a plurality of vent holes having permeable sintered metal arranged are formed instead of the release pin to serve as the second suction port. The suction negative pressure of the second suction port is set higher than that of the first suction port. High negative pressure from the second suction port inhibits air from remaining on the low temperature surface portion of the upper die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.