Dear Sales, Sales-Co and P&D
Reference this cause, The root cause maybe from rolling or forging mark .
because the defect occur near to surface of raw-material.
After milling deep about 5 mm. from raw-material surface have not detect.
( 1st Milling : milling depth 2.5 mm. found the defect point , 2nd Milling : Milling depth 2.5 mm. not found detect point)
So, Temporary Preventive Action :
Machining allowance should be 5 mm. deep from raw-material surface.
Because, 380 side the actual size is 384 mm. cut to size 192 mm. (2 pieces) and milling depth 2.5 mm. for finishing after that found the defect.
After found the defect, We are trial milling depth 5 mm. have not the defect remain.
To detail , I would like to explain in QMR-follow up activity.
Dear K.Pom
Please return to stock size 45x182x295 mm. HN.10061
and revise Balance from size 50x100x300 mm. to size 50x100x380 reference SO59010251/CI59010372
because balance actual size is 51.70x100x384 mm.
Dear K.Watchara
Please proceed inform to mill , We are fond defect at inside of material.
The defect deep from raw material surface about 4 mm.
- How to corrective action this problem.
- Why that UT-test can’t found this defect.