Molds & Tooling 5 görüntüleme

PPO Missing First Article Verification Causing Batch Scrap

Sorun Belirtisi

[Problem Phenomenon] After changing PPO grades or molds, mass production started directly without first article verification, resulting in batch defect scrap

Neden Analizi

Process windows differ greatly between PPO grades; parameters noted in data sheets are only general guidelines, and special situations (low shot volume, large parts, thin walls, gas assist) may require adjustment; skipping first article verification amplifies risk

Çözüm

First article full-dimension and performance verification is mandatory when changing grades or molds; solidify parameters after special process debugging; archive first article records; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability

Temel Çıkarım

PPO parameters are a starting point, not an end point; first article verification is the gate of mass production; 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

first article verificationgrade changemass productionprocess card

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PPO Missing First Article Verification Causing Batch Scrap

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