Injection Molding
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Unstable Cycle in Block Copolymer Polypropylene '2079851475616104452
Fenómeno do problema
The '2079851475616104452 cycle time fluctuates greatly, and the cycle time difference of the same product between different cycles exceeds ±3s.
Unstable cycle affects production efficiency and product quality consistency, and may cause abnormal part removal by the robot on automated production lines.
Análise das causas
（1）The cooling time is set improperly, and the cooling degree of the product is inconsistent
（2）The demolding is unstable, and the ejection action is sometimes delayed
（3）The plasticizing time fluctuates, and the screw retraction time is inconsistent
（4）The mold temperature fluctuates greatly, and the cooling rate changes
（5）The equipment action sequence is unstable, and the hydraulic system responds slowly
Solução
（1）Ensure the cooling time is sufficient and fixed, and use a timer for precise control
（2）Check the ejection system to ensure smooth ejector pin action, and add lubricating oil
（3）Stabilize the plasticizing parameters, with fixed screw rotation speed and back pressure settings
（4）Stabilize the mold temperature, stabilize the water channel flow, and control the temperature difference within ±2°C (40-90°C range)
（5）Check the equipment hydraulic and electrical systems, and repair the slow-responding valves and sensors
Conclusão principal
Unstable cycle is caused by the accumulation of time fluctuations in each process, and the cooling, demolding, plasticizing, and equipment systems need to be investigated one by one.
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