| 摘要 |
PROBLEM TO BE SOLVED: To obtain a metering process which can keep resin pressure uniform and perform correct measurement. SOLUTION: First, retreat of a screw is controlled on the basis of the pressure deviations of a set resin pressure and a detected resin pressure (T2). The screw is rotated at a set speed (T3). When the position deviations Sd of a metering finish position Sb and a present screw retreat position are a set value Ss or below, the control of the retreat of the screw by the pressure deviations is stopped to be changed over to the control of positioning on the basis of the position deviations (T5-7). A screw rotational speed command prepared by correcting the pressure deviation components of the set resin pressure Ps and the present resin pressure Pa from screw rotational speed components (T11 and T13) decelerated in proportion to the position deviations Sd is obtained and outputted (T12 and T13). The resin pressure is kept to be the set resin pressure, the screw is stopped at the metering finish position, and uniform and exact metering can be performed. The quality dispersion of moldings can be eliminated. COPYRIGHT: (C)2004,JPO
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