Method for injection molding
US6555035B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2001 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Oct 17, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2945/76943
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The retreat completion position of the screw in the charging step in actual production is controlled based on the result in pilot production as follows. In pilot production, the measurement value Ts of the screw driving torque is integrated with respect to the screw position P from the forward limit to the retreat completion position Ps. When conforming item is produced in the pilot production, the value &Sgr;Ts·dP obtained as a result of the integration is stored as a reference value. After actual production begins, the measurement value Tx of the screw driving torque is integrated in real time with respect to the screw position P from the forward limit to the screw position at each time. The obtained value &Sgr;Tx·dP is monitored. When this value &Sgr;Tx·dP coincides with the reference value &Sgr;Ts·dP, it is determined that the charging step has been completed, and the retreat operation of the screw is stopped.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.