An object of the present invention is to provide a steel coil packing inner ring producing device for producing the inner circumferential ring of different diameters without replacement of the processing rolls.
The present invention to achieve the above object bend that in the rectangular plate member in a plurality of inner ring producing apparatus using a roll to manufacture the inner ring of the ring-shaped, in cross-section bent to the character "b" forms a rectangular plate .; And it characterized in that it comprises an annular end of the inner ring of the annular processing by pressing the sides of the bent plate member by the bend.
The present invention can produce the inner rings of various diameters without replacement of the annular rolset, and an effect of improvement in productivity, and because there is no need to provide a large number of annular rolset of to reduce the equipment cost that can reduce the production costs there is an effect.