Patent ID: 7132067

Claim:
A mold-clamping control method for an injection molding machine, comprising: detecting a value of a monitor item in a monitor region predetermined in relation to a mold closing operation during the course of a mold clamping step; performing emergency processing when the detected value exceeds a threshold value; and performing an automatic setting operation including the steps of periodically detecting the value of the monitor item in the monitor region at predetermined sampling intervals to thereby obtain detection values in sampling order; repeating the step of periodical detection for each of a predetermined number of shots; obtaining a threshold value for each place of sampling order, on the basis of the detection values, by use of a predetermined arithmetic expression; and storing the obtained threshold values for use in control, wherein a minimum value Xs and a maximum value Xw are obtained from the detection values that pertain to the same place of sampling order with respect to all of the shots; a median Xj is obtained, on the basis of the minimum value Xs and the maximum value Xw, by use of Xj=(Xw−Xs)/2; and a threshold value Di for each place of sampling order is obtained, on the basis of the median Xj and the maximum value Xw, by use of Di=[{ ( Xw−Xj )× ka}+Xj]+kb where ka and kb are constants.