Extrusion & Post
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COC 3D Printing and Injection Molded Parts Mixed Use Failure
Problem Phenomenon
After assembly of COC injection molded parts with parts of other processes in the same assembly, the performance is not up to standard; dimensional fit and strength verification both pass but the system test fails.
Cause Analysis
Differences in material state (orientation, crystallization, residual stress) of different processes cause system-level performance mismatch; the isotropy of COC injection molded parts responds differently from the anisotropy of printed parts; verification did not cover system conditions.
Solution
①System-level verification covering real assembly and use conditions; ②unify the process route for critical mating parts; ③allocate tolerances for interface dimensions according to actual process capability; ④failure analysis to locate process difference factors.
Key Takeaway
The process consistency of COC parts affects system reliability; qualified individual parts do not mean a qualified system; the verification level must match the failure mode level.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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