Method of and apparatus for automatically controlling pressure in holding furnace incorporated in low pressure die-casting system
US4741381A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1987 |
| Grant date | May 3, 1988 |
| Priority date | — |
| Expiry date | Jan 16, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2280/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a method of and an apparatus for automatically controlling the pressure in a holding furnace incorporated in a low pressure die-casting system in accordance with a desired pattern. A proportional pressure control valve operated by a microcomputer is provided in a pressurized gas supply circuit for supplying pressurized gas into the holding furnace. The pressure in the holding furnace is changed in accordance with a pattern which is as close as possible to a desired pressurization pattern by sending to the proportional pressure control valve a command value obtained by adding to an input command value of the proportional pressure control valve a correction value calculated by a predetermined computing method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.