Production method of collision and collision forming member forming member

摘要

To provide a method of manufacturing a collision forming member and the protrusion forming member, which can be improve the production efficiency by reducing the number of processing steps, can be easily formed large difference in height protruding portion formed on the plate. Is defined by (45) an opening having a circular shape formed on the plate, the flange portion positioned outside of the (45) an annular aperture (22) and disk portion located inside (45) an annular aperture (24) , arms of the plurality of connecting circular plate portion (22) and flange portion (24) to have a length with a margin than (L) opening width (45) an annular aperture and (23) , that is formed by punching a plate material, is pushed into the vertical flange unit (24) circular plate portion (22), a predetermined spacing between the disc portion (22) the flange part (24) form.