EP 0000855 B1 19810128 - PRE-CONTROLLING PROCESS OF A CONTINUOUS TANDEM TRAIN FOR THE HOT-ROLLING OF METALS
Title (en)
PRE-CONTROLLING PROCESS OF A CONTINUOUS TANDEM TRAIN FOR THE HOT-ROLLING OF METALS
Publication
Application
Priority
FR 7724457 A 19770808
Abstract (en)
[origin: EP0000855A1] 1. A method for the preliminary adjustment of a tandem stand continuous mill for the hot rolling of metal products, in particular thick products, by means of a model giving the ratios between the values of certain parameters such as input and output speeds, the dimensions and the temperature variations of the product, the rolling forces and torques, the slip, the input and output tractions, the reference value being the speed, and in which method the rotational speed of the rolls is acted upon characterised in that : - the thickness reductions per stand having been selected, the rotational speed ratio of the upstream and downstream stands and the output speed of the product from the upstream stand are calculated by means of the model ; - the output speed of the product from the upstream stand is measured, the product being engaged in this stand alone ; - the measured speed is compared with the calculated speed ; - the coefficients relating to the various parameters of the ratios provided by the model are corrected, if necessary, by re-calculating them from the measured value of the speed of the product ; - the new rotational speed ratio of the rolls of the two stands is calculated from the corrected coefficients of the model ; - the rotational speed of at least one of the stands is modified in according with the new ratio before the entry of the product into the downstream stand.
IPC 1-7
IPC 8 full level
B21B 37/16 (2006.01); B21B 37/52 (2006.01)
CPC (source: EP)
B21B 37/16 (2013.01); B21B 37/52 (2013.01)
Designated contracting state (EPC)
DE GB SE
DOCDB simple family (publication)
EP 0000855 A1 19790221; EP 0000855 B1 19810128; EP 0000855 B2 19870429; DE 2860375 D1 19810319; FR 2399883 A1 19790309; FR 2399883 B1 19800418
DOCDB simple family (application)
EP 78400073 A 19780804; DE 2860375 T 19780804; FR 7724457 A 19770808