专业注塑故障分析.pptVIP

* 1. Adapt injection speed 2. Add a large cold slug area 3. Add cold wells at the end of runner system 4. Control nozzle heat better: if necessary add beryllium copper tip (not recommended for FR resins) 5. Shorten or eliminate standard sprue bushing: use a hot sprue bushing 6. Clean flow must exist from the cylinder, adaptor, nozzle and tip: avoid and eliminate any dead pockets or sections 1. Decrease injection speed 2. Increase mould temperature 3. Increase melt temperature 4. Increase gate size 5. Change gate location * 1. Decrease injection speed 2. Check nozzle heating 3. Increase mould temperature 4. Increase melt temperature 5. Increase gate size 6. Avoid gating at thick section 7. Modify gate location or angle: directly into wall or pin 8. Use tab gate or submarine plus pin * * * * Action: 1. Increase dosage 2. Increase injection pressure 3. Increase booster time forward 4. Increase material temperature by increasing cylinder termperature 5. Increase mould temperature, if glass-filled 6. Check material flow length vs wall section thickness 7. Increase nozzle diameter 8. Check restrictions of nozzle, runners and actual gating 9. Increase gate size of sprue and runner system * Action: 1. Increase injection speed to maximum range 2. Sometimes lower injection speed: crystalline materials 3. Increase injection hold time 4. Increase injection pressure 5. Reduce melt temperature 6. Reduce mould temperature 7. Check for hot spots: separate water channels in cooling system/add heat pipes such as thermal pins or beryllium copper slugs for spot cooling. 8. Enlarge and/or add vents to mould parting line 9. Increase size of sprue and/or runners 10. Increase gate size and reduce gate land length 11. Relocate gate next to heavy or thicker areas 12. Core out heavy wall sections where possible 13. Incorporate texture surfaces * * Action: 1. Check pre-drying: dry material before use 2. Check moisture content after pre-drying 3. Check effectiveness of drying equipment: temper