| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for controlling an injection molding machine, capable of accurately metering a molten material in a state reduced in the fluctuations from target pressure. SOLUTION: When the mass of a material 3b to be melted, which is supplied for a timeΔt from the supply port 7 of an injection screw 9, is set toΔM and the volume thereof is set toΔV, the density (d) of the molten material is given by d=ΔM/ΔV=BA/Cv (wherein, v is the retreat speed of the injection screw 9, A is a rotational speed and B and C are constants). It is judged whether the deviationΔd=d-d0 between the density (d) calculated from the measured value of the resistance torque from a load cell 29 and taget density d0 becomes positive or negative or becomes near to zero and the deviation d is allowed to approach zero. For example, in the case ofΔd>0, linear velocity (v) is increased or the rotational speed A is repeatedly corrected by a correction control command arithmic means 31 so that theΔd approaches 0. This procedure is continued at a constant time intervalΔt.
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