Shenzhen Alu Rapid Prototype Precision Co., Ltd.

Changing an injection mold (often called a Mold Changeover or SMED - Single-Minute Exchange of Die) is a critical technical procedure. It requires precision to ensure the safety of the operator and to prevent damaging the high-value steel or aluminum tools.

Here is the professional workflow for swapping a mold on an injection molding machine:

1. Preparation & Safety

Before stopping the machine, ensure the new mold is staged and pre-heated if necessary.

Purge the Barrel: Run a purging compound through the screw to remove the previous material, especially if switching from a high-temp plastic like PEEK to something lower like ABS.

Lock-Out Tag-Out (LOTO): Ensure the machine’s heater bands are at a safe "soak" temperature and the hydraulic/electric power is isolated for the physical swap.

2. Removal of the Old Mold

1.Close the Mold: Move the moving platen until the mold is fully closed.

2.Disconnect Utilities:  Drain and disconnect all water lines (thermocooling).

       Disconnect hot runner cables and any hydraulic core-pull sensors.

3.Secure the Mold: Attach a hoist or crane to the eyebolt on top of the mold.

4.Unclamp: Loosen the toe clamps or deactivate the magnetic/hydraulic clamping system on both the stationary and moving platens.

5.Extraction: Carefully lift the mold out of the machine press.

3. Installation of the New Mold

1. Clean the Platens: Use a stone or fine abrasive to remove any burrs or rust from themachine platens. A flat surface is vital for a perfect seal (I0.01mm parallelism).

2. Align the Locating Ring: Lower the new mold into the center of the press. The locatingring on the stationary side must seat perfectly into the hole in the platen to align thesprue with the nozzle.

3. Clamp the Mold: * Secure the stationary side first.

      Slowly close the press to meet the moving side, then secure those       clamps.

      Note: If using aluminum molds, use slightly lower clamping pressure to avoiddeforming the softer metal.

4. Connections & Set-Up

Water Lines: Reconnect the cooling loops. Ensure the "In" and "Out" lines match the flow direction required for optimal thermal management.

Ejection System: Connect the machine's ejector rods to the mold's ejector plate. Manually test the stroke to ensure it doesn't bottom out.

Nozzle Touch: Bring the injection unit forward. Ensure the nozzle radius matches the mold's sprue bushing to prevent "drool" or high-pressure leaks.

Technical Comparison: Changeover Factors

Key Pro-Tips for Efficiency

The "Golden" Setup Sheet: Always keep a digital record of the exact temperatures, pressures, and cycle times used the last time this specific mold ran successfully.

Preventive Maintenance: Before storing the old mold, spray the cavities with a rust preventative (VCI) to protect the polished surfaces from humidity during storage.