Injection pressure control apparatus for a die cast machine
US5125820A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1990 |
| Grant date | Jun 30, 1992 |
| Priority date | — |
| Expiry date | Apr 19, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D17/32
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention relates to an injection pressure control apparatus for a die cast machine and an injection mold machine. In the injection pressure control apparatus, it detects whether the pressure increase state of the instance when the pressure of the injection cylinder is increased through a pressure increasing circuit is normal or not. When detecting the above state, the pressure change obtained at the instance when the pressure increasing circuit is operated is detected between two points, of which it is determined whether the time spent therebetween is within an allowable time or not and the result is indicated. Moreover, the pressure detected after the pressure increasing circuit was operated and a predetermined period of time has passed is determined whether it is within a predetermined allowable range or not and the result thereof is indicated. Further, in the injection pressure control appratus for the injection mold machine, it is detected whether the detected pressure value at the instance when the pressure of the injection cylinder is increased and a predetermined measurement command signal is given is within an allowable range or not and the result thereof is indicated…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.