Molds & Tooling
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ABS weld line strength
Problem Phenomenon
[Problem Phenomenon] ABS multi-gate product has obvious weld lines, cracks along the line under force
Cause Analysis
Converging front temperature drops and molecular entanglement insufficient, strength 20-40% lower than the bulk; poor venting and low mold temperature aggravate; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Raise melt temperature and mold temperature to promote fusion; move weld line out of the stressed area; set overflow well; after adjustment, continuously sample to verify the effect, resume mass production only after confirming stability; change only one variable each time and record parameter changes to facilitate locating effective measures
Key Takeaway
ABS weld line strength is discounted, three moves of temperature, relocation, and overflow well; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems later
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