Apparatus for manufacturing band plate

An apparatus for manufacturing a band plate, comprising a rolling mill that includes:

• a pair of upper and lower work rolls that roll a slab material having edge drop portions at both ends thereof;
• and
• a pair of backup rolls that contact non-rolling side surfaces of the pair of upper and lower work rolls, respectively to prevent the work rolls from being deformed,
• wherein each work roll comprises
• i. a rolling portion:
• ii. a reverse taper portion at a barrel end portion of the rolling portion;
• and
• iii. a cylindrical expansion diameter portion outside the reverse taper portion, the barrel end portion corresponding to the edge drop portion of the slap material, wherein the reverse taper portion has a roll diameter that gradually increases towards the expansion diameter portion,
• the upper and lower work rolls are configured to be shiftable individually in the axial direction thereof,
• and each backup roll comprises an escape portion and a cylindrical contraction diameter portion outside the escape portion, wherein the escape portion has a diameter that gradually decreases towards the contraction diameter portion so as not to contact the reverse taper portion within a shifting range of the work roll,
• and the cylindrical contraction diameter portion of each backup roll contacts the expansion diameter portion of one of the upper and lower work rolls.