Patent ID: 7588435

Claim:
An apparatus for generating an injection speed pattern data for an injection molding machine, through which an injection screw speed is commanded in accordance with a position of the screw in a barrel cylinder during injection molding operation, comprising: a cross-sectional area information unit which provides cross-sectional area information of a molded article based on shape information of the molded article for at least one position of a frontal portion of a material being molded in a cavity in the direction of movement of the material being molded; a parameter setting unit which sets parametric information including at least cross-sectional area of the barrel cylinder, filling time interval for filling the cavity with the material being molded, length of the molded article in the direction of movement of the material being molded, and sectional amount of each of one or more zones in the cavity along the length of the molded article; a processing unit which determines the injection screw speed corresponding to each of the zones based on the cross-sectional area information and the parametric information, wherein the injection screw speed is such that the advancement of the frontal portion of the material being molded in the cavity has a constant moving speed Vm in a direction of its axis during a whole stroke of one injection molding operation; and a memory which stores the injection speed as command data for the injection speed corresponding to each of the zones.