Material shearing --Pressing logo -- roller bending -- planishing --butt welding -- trimming -- removing burrs -- expanding mouth -- roll forming (two steps) --expanding & trimming -- contracting & trimming--punching air-valve hole --inspecting
Our program has its special_only need two steps roll forming (others need three steps). After two times forming, inner diameter is less than the size in the drawing. So, expand and contract the rim by special moulds.
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