| 摘要 |
PURPOSE:To prevent a mold from damaging by preventing surplus injection pressure from generating, by a method wherein when a detected injection pressure has become a preset mold protection pressure or higher by detecting injection pressure at the time of an injection process, the process is not shifted to a dwell process, but shifted to a measuring process. CONSTITUTION:When a fact where an injection pressure has become a preset mold protection pressure or higher due to some reason or other is detected by a pressure detector 2 through an A/D converter 24 during an injection process, a CPU 12 for PMC starts a timer by controlling output torque of a servomotor 3 to a torque limit value corresponding to low pressure of safety pressure preset on a common RAM 18. When the time of the timer is up, treatment of a dwell process is not performed and then shifted to treatment of a measuring process. In other words, when there is a fear where the injection pressure exceeds the mold protection pressure due to some reason or other and the mold may be damaged at the time of injection, damage of the mold is prevented by turning output torque into safety pressure by controlling the output torque to low torque immediately. |
