Fixed circumferential folds in transmission gear forgings are caused by unsmooth metal flow at the forging flare, where fast-flowing metal entrains surface material into the forging; this defect can be eliminated by lowering the flash lower bill and enlarging transition rounded corners to balance metal flow speed.
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Why 6% of our gears were scrapped? The hidden folding defect!Añadido:
Workmates, why do fixed circumferential folds appear on transmission second shaft gear forgings? The core reason is unsmooth metal flow at the forging flare. Fast-flowing metal at the flash entrains surface metal into the forging, forming folding defects. We lowered the flash lower bill and enlarged transition rounded corners to balance metal flow speed. After mold modification, folding defects were completely eliminated. This is the practical solution to gear forging folding defects.
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