Injection Molding
2 views
Unstable cycle of general-purpose polyethylene '2079851475616104452
Problem Phenomenon
The '2079851475616104452 cycle time fluctuates greatly, and the cycle time difference of the same product exceeds ±3s.
Unstable cycle affects production efficiency and product quality consistency, and may cause abnormal part picking by the robot on automated production lines.
Cause Analysis
（1）The cooling time is improperly set, 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 back 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
Solution
（1）Ensure that 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, and fix the screw speed and back pressure settings
（4）Stabilize the mold temperature, stabilize the water flow, and control the temperature difference within ±2°C (within the range of 30-80°C)
（5）Check the equipment hydraulic and electrical systems, and repair slow-responding valves and sensors
Key Takeaway
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.
Was this helpful?
0 people found this helpful
Thank you for your feedback!