Mold clamping method
US4925618A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1989 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | May 9, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/6764
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The method having a clamping cylinder which slidably fits a clamping ram whose front end is fixed on a movable board of an injection molding machine, etc., an inner space of the clamping cylinder divided into a rear chamber W and a front chamber X by a large-diameter piston section of the clamping ram, an inner rear wall of the clamping cylinder having a mold opening piston fixed thereto having a front end slidably fit in the clamping ram from the rear, an inner space of the clamping ram being divided into a chamber Y and a chamber Z opening to the atmosphere by the large-diameter piston section of the opening piston, a hydraulic controlling device which connects the chambers X, Y and Z to an oil pressure source and connects the chambers X and Y to the chamber W for a high-speed mold closure, which connects the chamber W to the oil pressure source and relieves the pressure in the chambers X and Y for a tight clamping, and which connects the chamber Y to the oil pressure source and connects the chamber W to both the chamber X and the oil tank for opening the mold, the effective pressure receiving area of the chamber Y being preferably designed to be equal to the cross-sectional area…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.