Moreover, according to the invention, since the constant and small working roll surface profile can be maintained, a limitation occurring regarding the plate width order of the coffin schedule type can be relaxed, and a rolling schedule can be made freely even for considerably long-time rolling.

Спасибо!

Понятие встречается в manual к software по созданию графиков прокатки. Вот ещё кусок:
For this reason, there has been used such a so-called "coffin schedule" of rolling as the rolling is performed by a process having the steps of: sequentially changing plate widths so that the width of each of the plates to be rolled is increased sequentially till such a period of time of small wear as to correspond to about 10 to 20 pieces of rolled plates to thereby make the thermal expansion profile dispersed; and then changing the plate width so that the width of each of the plates to be rolled becomes narrow sequentially to prevent the working roll end regions having the peaks of the wear profile from contacting with the plates.

Катаем сталь. Нашла статью с иллюстрациями: график действительно имеет форму гроба, шестиугольный он. Как-то надо это передать в переводе