CONTROL METHOD AND CONTROL DEVICE FOR INJECTION MOLDING MACHINE

PROBLEM TO BE SOLVED: To conduct accurate monitoring of all the parting openings and a correct determination toward a molded article by stably collecting data on an accurate parting opening.SOLUTION: A molding injection pressure Pi with which a parting opening Lm is formed between a movable mold 2m and a fixed mold 2c of a mold 2 during injection-filling and which allows formation of a good molded article is obtained and set in advance. A molding clamping force Pc that allows formation of a good molded article is obtained and set in advance. During production, a mold clamping device Mc is clamped with the molding clamping force Pc, and an injection device Mi to set the molding injection pressure Pi as a limit pressure Ps is driven to injection-fill a mold 2 with resin R. Then, a parting opening detector 3 that detects the parting opening Lm is provided. During production, reset control is executed to reset the parting opening detector 3 to zero if reset timing tr set in advance in a range covering a given period Zs before injection start time and the given period Zs after the injection start time has come at least on condition that given preparation for injection is completed after clamping. 【課題】 パーティング開量に係わる正確なデータを安定して収集し、パーティング開量の的確なモニタリング及び成形品に対する的確な良否判別処理を可能にする。【解決手段】 予め、射出充填時に金型２の可動型２ｍと固定型２ｃ間にパーティング開量Ｌｍが生じ、かつ良品成形可能な形射出圧力Ｐｉ及び良品成形可能な成形型締力Ｐｃを求めて設定するとともに、生産時に、成形型締力Ｐｃにより型締装置Ｍｃを型締し、かつ成形射出圧力Ｐｉをリミット圧力Ｐｓとして設定した射出装置Ｍｉを駆動して金型２に樹脂Ｒを射出充填するに際し、パーティング開量Ｌｍを検出するパーティング開量検出器３を設け、生産時に、型締後における所定の射出準備が完了したことを条件に、射出開始時の前後所定期間Ｚｓの範囲における予め設定したリセットタイミングｔｒに達したなら、パーティング開量検出器３をゼロリセットするリセット制御を行う。【選択図】 図１