When grinding the elbow, 80 mesh shutter wheel should be used. The black one is easier to use. The apprentice suggests to use the red one. It must be slow and can't be pressed by force. The grinde...
Reason:1. Material development length error in design2. loose positioning3. The angle deviation of hem affects the size4. The R angle is too large (mold height, air cushion pressure, etc.) due to the ...
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