Method and device for pressure die casting
US5188165A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1990 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Dec 12, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D17/203
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method and apparatus for die casting comprising a stationary lower machine table (5) provided with a stationary lower mold part (24) which cooperates with a vertically moveable upper mold part (22) mounted on an upper machine table (10) and displaceable by hydraulic cylinders (7). The upper machine table (10) and the upper mold part are provided with a filling chamber (20) for receiving a measured quantity of a molten metal which is to be pressed into the mold by an upper piston (18). A lower piston (43) is moved to a variable position relative to the filling chamber, prior to the molten metal filling, and thereafter the upper piston (18) is moved into contact with a top surface of molten metal, without any air-entrapment or with only a minor entrapment of air. After this has occurred, the upper piston and the lower piston are displaced jointly downward until the lower piston is in a casting position in the lower mold part, whereupon the upper piston is displaced further downward to feed the molten metal and maintain pressure of the molten metal until the casting operation is completed. The cylinder casing (38) of the lower piston is rigidly connected to a mechanism (29-37) desig…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.