Patent ID: 7981333

Claim:
A method of setting a mold clamping force of an injection molding machine that sets a mold clamping force smaller than a maximum mold clamping force when a mold is clamped by a mold clamping device; comprising the steps of: setting a lower limit threshold value by subtracting a predetermined offset value from a mold completion position at a time of mold clamping; placing at least a pair of position sensors on a first outer surface of a fixed platen supporting a fixed portion of the mold and a second outer surface of a movable platen supporting a movable portion of the mold; sequentially clamping the mold with a mold clamping force obtained by sequentially lowering a mold clamping force by a predetermined amount from the maximum mold clamping force; detecting a relative position of the movable platen with respect to the fixed platen in an injection process, the relative position reflecting deformation of the mold due to an undesirable pressure in the mold during an injection process; and properly adjusting a mold clamping force upon detecting the relative position having a certain value that is equal to or less than the predetermined lower limit threshold distance.