| 摘要 |
In an apparatus for folding sheet metal, comprising a bed 20 for support ing a sheet metal workpiece with the workpiece projecting over the front edge of the bed, a clamping beam 16 pivotable about a horizontal axis for clamping the workpiece to the bed, and a folding beam 26,36,38 normally hanging downwards along the front of the bed as shown and pivotable upwards about an axis A for the top edge of a metal block 38 to fold the workpiece, the bed is capable of lowering relative to axis A. A front portion of the clamping beam is removable and replaceable by a cylindrical mandrel having its axis in the vertical plane containing A and if the bed and clamping beam are then lowered until the mandrel axis coincides with A, and the folding beam is adjusted to lower the effective top edge of block 38 appropriately, then accurate radii can be folded in the workpiece around the mandrel. Stepped blocks 36 are secured at selected positions along a rebate 34 in beam 26 and rectangular blocks 38 may be cut from appropriate thickness for particular jobs. <IMAGE> |
