MD1229C2 - Process for metal velocity control of the continuous hot multi-stand mill - Google Patents

Abstract

The invention relates to the process for metal speed adjustment on the multistand continuous hot-rolling mill for providing minimum longitudinal tractive forces in the metal subject to the metal uneven heating along its length and is realized in several stages, namely: it is adjusted in the first phase for the wrong initial determination of the mill speed previous the first stand 1.1 of unit (1) and subsequent second stand 1.2 of unit (1) which is manifested in the power short circuit between two stands through the rolling material in the form of uneven variation of the load moment on the first stand, the arising deviation in a short space if time by changing the first stand revolutions amount; during the second phase joining to the first one also in a short space of time, at the expense of the fact that the subsequently distributed from the memory by the initial adjustment on the minimum draught the load moment values are compared with the correspondingly current values of the loading moments of the second stand; it is formed the matching coefficient on the base of which it is carried out the corresponding change of the value of all subsequently retained in the memory at the first stand moment values In the next third phase occurs the continuous adjustment of the aroused between the coordinated according to their scale retained in the memory moment values and current moment values of the second deviation stand.In the fourth phase is made the comparison of the load moments values on the second stand before and after the rolling material output from the first stand and according to the difference is made the correcting pre-adjustment during the mill of the subsequent feed.