Processing Machinery
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PC metal insert preheating
Problem Phenomenon
【Problem Phenomenon】PC metal insert cracking after molding
Cause Analysis
PC and metal have large differences in thermal expansion coefficient; when inserts are not preheated, the melt encounters cold metal and shrinks rapidly causing cracking; preheating inserts to 100-120℃ reduces stress；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Insert preheating 100-120℃; design fillets to reduce stress concentration; annealing to eliminate stress；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PC inserts must be preheated to 100-120℃, cold and hot meeting causes cracking；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence；Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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