Injection control apparatus for an injection-molding machine
US4828473A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Nov 19, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/45244
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed herewith is an injection control apparatus which is used for an injection-molding machine that is subjected to injection and hold pressure controls by means of a numerical control unit (30), and which controls the switching from the injection control to the hold pressure control based on the injection time and resin pressure so as to improve the operation reliability of the injection-molding machine and ensures production of good-quality molded articles. When the pressure on the resin filled in a mold that is detected by pressure detection means (26) exceeds preset pressure or when a predetermined time elapses after the start of the injection operation, hold pressure control means (30, 50, 60) starts the hold pressure control. When pulse distribution to a hold end position is not completed upon completion of the hold pressure control, an error register (51) of a servo circuit (50) is followed up by follow-up means (30) so that the pulse distribution is forcibly executed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.