Regular mold maintenance is essential for consistent part quality and maximum tool life. A well-maintained mold can produce millions of cycles, while a neglected mold may fail after just thousands.
After each run (daily): clean parting lines and vents, lubricate ejector pins and slides, check for damage, and apply rust preventative. Weekly: inspect cooling channels for blockage, check hot runner nozzle tips, verify guide pin alignment. Monthly: measure key dimensions, check wear on gates and runners, inspect heater bands and thermocouples. Quarterly: full disassembly cleaning, replace worn components, pressure test cooling circuits.
Gate wear: erodes from abrasive materials, causing gate blush and increased vestige. Vent wear: fills with gas residue, causing trapped air and burn marks. Cavity surface wear: dulls polished surface, increases ejection force. Core pin wear: causes wall thickness variation. Slide wear: causes flash and part damage.
Minor cavity damage can be repaired by micro-welding and re-polishing. Worn gate areas can be re-machined or replaced with gate inserts. Chrome peeling requires stripping and re-plating. Heat checking (thermal fatigue cracks) in H13 molds can be ground out and welded if shallow.