Control device of injection molding machine and method of setting mold clamping force

A control device of an injection molding machine, the injection molding machine comprising:

• a mold clamping device that advances and retracts a movable mold with respect to a fixed mold;
• and an injection device that injects and fills a molten material into a cavity formed between both the molds, the control device comprising:
• a display unit that displays a setting screen for setting molding conditions of the injection molding machine;
• and
• a setting unit that sets the molding conditions based on information displayed on the setting screen,
• the setting screen having:
• a first display column that displays a plurality of screw positions from a measurement completion position of a screw of the injection device to a pressure-keeping switching position of the screw of the injection device;
• and a second display column that displays mold clamping forces generated by the mold clamping device in such a manner that the mold clamping forces are associated with the plurality of screw positions displayed in the first display column,
• the setting unit setting the molding conditions in such a manner that each of the plurality of screw positions displayed in the first display column is associated with the mold clamping force displayed in the second display column as a mold clamping force to be generated when the screw has reached the screw position, wherein
• the setting screen has a third display column that displays a mold closing speed of the mold clamping device, and
• the setting unit sets the molding conditions in such a manner that each of the mold clamping forces respectively associated with the plurality of screw positions is associated with the mold closing speed at a time when the mold clamping force thereof displayed in the third display column is generated.

A method of setting a mold clamping force of a mold clamping device using a control device, wherein

• the control device is a control device of an injection molding machine which comprises:
• the mold clamping device that advances and retracts a movable mold with respect to a fixed mold;
• and an injection device that injects and fills a molten material into a cavity formed between both the molds,
• the control device has a display unit that displays a setting screen for setting molding conditions of the injection molding machine;
• and a setting unit that sets the molding conditions based on information displayed on the setting screen, and
• the setting screen has a first display column that displays a plurality of screw positions from a measurement completion position of a screw of the injection device to a pressure-keeping switching position of the screw of the injection device;
• and a second display column that displays mold clamping forces generated by the mold clamping device in such a manner that the mold clamping forces are associated with the plurality of screw positions displayed in the first display column,
• the method of setting the mold clamping force comprising:
• (a) a first setting step in which the plurality of screw positions from the measurement completion position of the screw to the pressure-keeping switching position of the screw are displayed in the first display column to be set;
• (b) a second setting step in which setting is performed in such a manner that a screw position that has been selected, in order from a measurement completion position side, from the plurality of screw positions that have been set, is associated with the mold clamping force displayed in the second display column;
• (c) an injection step in which mold clamping is performed with the mold clamping force that has been set, and the screw is advanced to the selected screw position from the measurement completion position to have the molten material filled into the cavity;
• and
• (d) a judgment receiving step in which a molded article that has been extracted from the cavity after the injection step receives a judgment result of presence/absence of a defect,
• the mold clamping force in the molding conditions being set by repeating, for each of the plurality of screw positions, the following steps:
• when the defect has been found to be present in the molded article in the judgment receiving step of above-described (d), the set mold clamping force associated with the screw position where the defect has been confirmed is displayed and increased in the second setting step of above-described (b), and
• the injection step of above-described (c) and the judgment receiving step of above-described (d) are re-performed for the screw position where the defect has been confirmed.