Die-casting method
US4446907A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1980 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Oct 14, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D27/09
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to a die-casting method in which a molten metal is injected through a runner (31) into a die cavity (30) for casting an article and the injected metal is squeezed also from a squeezing passage (17) by a squeeze plunger (36). The squeeze passage is communicated with the die cavity (30) at a portion thereof where the die cavity is communicated with the runner (31). The invention is characterized in that, on squeezing, the molten metal is displaced from the squeeze passage (17) while forming a divergent flow, to thereby assure that squeezing operations are carried out always at a stable squeezing pressure. The invention is also characterized in that, of the portion of a die-cast body which has been solidified in the die cavity (30), the part opposed by the squeeze passage (17) is removed by cutting with a cross-sectional area greater than that of the squeeze passage and in the direction of movement of the squeeze plunger, so that the part of a die-cast body which tends to include surface defects and segregation which would adversely affect the mechanical strength and workability of the die-cast body is removed therefrom and, in addition, the bore or groov…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.