Method and apparatus for semi-molten metal injection molding
US6298901A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1999 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Jul 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S164/90
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In a semi-molten metal injection molding method of producing a thick molded article by injecting a semi-molten melt M of a magnesium alloy, in a semi-melting state, into a cavity 13 of a mold 11 through a product gate 17, characterized in that it is made possible to obtain a high-quality thick molded article free from internal defects. A solid fraction of the semi-molten melt M is set to not less than 10%, and more preferably within a range of 40 to 80%. A sectional area Sg of a product gate portion of the thick molded article corresponding to the product gate 17 is set to not less than 0.1 times a sectional area Sp in the vicinity of the product gate 17 in the product portion corresponding to the cavity 13. Furthermore, a product gate velocity Vg mm/s of the semi-molten melt M, a sectional area Sg mm.sup.2 of the product gate portion of the thick molded article and a volume Vp mm.sup.3 of the product portion are set so as to satisfy the following relationships: Vg.ltoreq.8.0.times.10.sup.4 ; and, Vg.times.Sg/Vp.gtoreq.10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.