How Injection Molding Plants Can Reduce Ineffective Mold Opening and Closing Strokes
Excessive mold opening and closing travel extends the cycle time per part and increases energy consumption; in long-term, continuous mass production, this accumulates into significant productivity loss. By utilizing servo-driven injection molding machines-combined with adjustments to hardware, parameters, and standardized management-manufacturers can reduce unnecessary idle travel and boost production efficiency.
Set the mold-open limit based on the actual mold thickness and the space required for part removal, rather than defaulting to the machine's maximum opening stroke. During the closing phase, configure multi-stage deceleration zones, leaving only the clearance necessary for part removal and insert placement to minimize unnecessary movement.
Servo-driven models support segmented position and speed control; limit parameters for opening and closing can be saved individually for each mold and recalled during mold changes, preventing the "dead travel" associated with generic, long-stroke settings.
Base the ejection distance on the requirements for smooth part release-there is no need for an excessively long ejection stroke. Initiate the mold-closing action only after the ejector has fully returned to its home position; this shortens the travel distance of the ejection cycle and reduces time wasted on inefficient movements within the overall cycle.
During the design phase for new molds, carefully control the spacing between the moving and fixed mold halves to avoid increasing the opening/closing distance through unnecessarily tall mold bases. For existing older molds, install mechanical limit blocks to cap the maximum opening distance, thereby physically constraining excessive travel.
Establish a database of mold parameters where each mold set is paired with specific settings for opening/closing and ejection positions; this eliminates the need for operators to repeatedly adjust to limit strokes after a mold change. Conduct regular operator training to foster the habit of setting travel distances according to actual needs, minimizing wasted idle travel caused by manual setting errors.
With proper setup and regular maintenance, controlling excessive opening and closing travel creates opportunities to shorten the cycle time per part and reduce energy consumption per unit of output, ultimately enhancing the workshop's overall production efficiency.
