Method for controlling injection in a die casting machine and apparatus for the same
US5957192A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1998 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Nov 25, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D17/32
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method and an apparatus for controlling an injection of a die-casting machine, the apparatus having an open-shut valve for opening and shutting a hydraulic channel through which hydraulic fluid is discharged from a boost cylinder device and a boost cylinder flow-control valve for regulating a flow of the hydraulic fluid discharged from the boost cylinder device. When a highly viscous molten material is injected toward a casting mold and the molten material reaches a gate of the casting mold, an injection resistance is increased. At this time, by regulating the hydraulic channel with the control valves to discharge the hydraulic fluid in accordance with a predetermined program, the boost cylinder device applies further pressure to the injecting piston to assist injection process, thereby preventing inappropriate change in injection speed. Consequently, the open-shut valve is opened to conduct ordinary pressure boosting pressure process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.