A Process Of Cold Bending Of Water Wall Panel To Manufacture Hopper/Skew Panel For High Pressure / High Temperature Steam Generator Used For Power Generation.

Abstract: The invention relates to a punch and dies, designed and manufactured for 2000T Press to bend the straight panel at helix angle varying from 130 to 200, to produce hopper/skew panel of any outside diameter ranging from 38.1mm to 42.4mm irrespective of tube thickness. A new method of manufacturing hopper/skew panels without joining two panels. The present invention is to manufacture Hopper/Skew panels having two plane bends. Bending of heat treated straight water wall panel with marked bending line is done with a pre-positioned Punch and Die in 2000T Press to produce hopper/skew panel. The punch (P) is fabricated with a pressing plate (06) welded perpendicularly at the center of a mounting plate (04) when the welding is done along the length of a mounting plate (04) with support plates (05) on both sides of a pressing plate (06). A rod is welded on the pressing end of the pressing plate (06). A die (D) is fabricated with support plates (10) provided at a regular intervals of 500 mm and welded with a base plate (08). The pressing is controlled with the Template to produce smooth bend panel and establishing the bend hopper/skew panel without use of tube joints. The Hopper/Skew panels in two plane bending are manufactured without joining two separate panels with means of welding and the drawbacks of material wastage in terms of loose bended tubes, welding consumables, excess panel material are eliminated. The panel bent width is varying from 3000 mm to 7000 mm. The length of the punch is 3750 mm and hence the operation is repeated if the bent width of the panel is more than 3750 mm. generation. Fig. 6.

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