Mold changeover is a key operation linking different production runs. Non-standard procedures often take 60–90 minutes and lead to damage, quality risks, and safety hazards. A standardized workflow can reduce changeover time by 30%–50% and minimize associated defects.

Pre-Change Preparation

Before mold change, a dedicated team is assigned with clear responsibilities. Operators must wear proper personal protective equipment. The injection machine is switched to manual mode, the barrel is emptied, and heating is turned off. Lifting equipment, torque wrenches, levels, and cleaning supplies are inspected.The new mold is verified for compatibility with clamping force and machine specifications. Cooling lines, ejection mechanisms, and locating rings are checked for damage. The work area is cleaned to ensure safe operation.

Removal of the Old Mold

The mold is closed, cooling water is shut off and drained, and hoses are disconnected and sealed. Clamp bolts are loosened diagonally to avoid uneven stress. The mold is lifted slowly using a hoist to prevent collision. After removal, the mold is cleaned, coated with rust preventive, inspected for wear, and stored properly.

Installation and Commissioning of the New Mold

The new mold is centered and positioned using the locating ring. Clamps are tightened diagonally with calibrated torque. Cooling lines are connected with correct inlet and outlet direction. Opening stroke, ejection stroke, and speed are adjusted manually to avoid interference. The nozzle is aligned precisely with the sprue bushing to prevent leakage. Clamping force is set according to projected area and material.

Process Tuning and Trial Production

The barrel is heated to material-specific temperatures. After purging residuals, initial injection parameters are set for speed, pressure, holding, and cooling. The first shot is inspected for dimensions, sinks, flash, and warpage. After approval, automatic production is activated, and multiple samples are verified. Stable parameters are recorded for future reference.

Final Inspection and Site Cleaning

After stable production, tools are returned, waste is removed, and connections are rechecked. Changeover time is recorded for continuous improvement. Equipment and mold maintenance records are completed.

Safety Precautions

Lifting operations must be supervised, and no one should stand under suspended loads. Hands must not enter the mold area during movement. Water and power connections must be secure. Abnormal noise or leakage requires immediate shutdown.

Conclusion

A standardized mold change process improves efficiency, safety, and product consistency. By following structured preparation, removal, installation, testing, and documentation, injection plants can achieve stable, high-efficiency production and reduce operational risks.