Molding Process
7 조회수
Structural Factors of PC Stress Cracking
문제 현상
The products crack concentratedly at sharp corners, notches or wall thickness transitions, with cracks initiating from stress concentration points
원인 분석
Sharp corners, right angles and wall thickness transitions cause stress concentration, amplifying the local stress several times; PC has strong notch sensitivity, and stress concentration areas crack first under the action of solvents or loads
해결 방법
①Round all internal corners with R≥0.5mm and eliminate V-shaped grooves; ②control the wall thickness difference within 20% and the transition slope ≤1:3; ③rib thickness not exceeding 60% of the main wall thickness
핵심 요약
Structural design determines the upper limit of the stress distribution of PC parts; fillets, uniform wall thickness and gentle transitions are the three anti-crack design principles, which must be implemented before mold making; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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