Method for bending mounting housing from sheet metal blank, involves inserting protruded portions into recess formed on narrow side walls, against blades that are bent upwards around specific bending angle

摘要

The blades (6) of broad side walls (3) are bent upwards with bending radius around first bending angle. A narrow side wall (4) is bent upwards along bending edge (5) at second bending angle. The narrow and broad side walls are bent upwards along bending edges by third bending angle smaller than the second bending angle. The narrow side wall is bent backwards in the direction of blades, about fourth bending angle. The protruded portions (8) are inserted into recess (7) formed on the narrow side wall, against the blades.