冷間圧延用作動ロールの寿命についての考察

概要

論文の詳細を見る
The life of work rolls for cold rolling has a very important role on productivity. Factors affecting the life of the work rolls are considered in three categories ; (1) resistibility to cracking, (2) thickness of the hardened layer, and (3) resistibility to spalling. The results of this investigation are as follows ; (1) The frequency of the "burning" when the strip was broken reaches 13.5% of the total times of roll changing, and the sum of ground thickness attributable to the cause of burning amount up to about 70% of the total ground thickness. (2) The improvement of the quality of rolls by changing the chemical composition and the heat treatment resulted in the reduction of the average grinding loss to 60% and the increase of rolling tonnage to twice. (3) The roll with thicker hardened layer shows better rolling tonnage and good surface quality of strip and button marks, nonmetallic inclusions, dendrite structure, etc. are minimized. (4) The spalling phenomena of rolls are different by the type of the rolling mill. Band-type fatigue fracture is chiefly seen in cold rolling and in rather large diameter roll, and on the other hand, shell-type fatigue fracture is seen in temper rolling and in small diameter roll. Moreover, the spalling occurs easily in winter and especially in thermally by unequivalent conditions when the roll is warmed up in operation and when the roll is cooled down after operation.
社団法人日本鉄鋼協会の論文
1971-04-01