Mold motion control system for an injection molding machine
US8221670B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2011 |
| Grant date | Jul 17, 2012 |
| Priority date | — |
| Expiry date | Apr 1, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/6735
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for injection molding comprises pre-positioning a clamp piston within a cylinder housing to a datum position axially intermediate a clamping position and an unclamped position, the clamp piston affixed to a tie bar, the clamp piston and cylinder housing cooperating to provide a clamp chamber and an unclamp chamber in a clamp cylinder housing on axially opposite sides of the clamp piston for urging the clamp piston towards the clamping and unclamped positions, respectively, when pressurized. Pre-positioning the clamp piston can include leaving a positioning gap between portions of a mold before releasably locking a tie bar to one of the moving or stationary platens, and then advancing the moving platen to substantially close the positioning gap after the releasable locking has been completed. Pre-positioning the clamp piston can include moving a stop member to an advanced position in the cylinder housing, and urging the clamp piston to bear against the stop member before the releasable locking step has been completed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.