Abstract Results of a study investigating skew rolling process for elongated axisymmetric parts are presented. Despite the fact that technique producing such was developed and implemented in mid-twentieth century, there no studies on this problem. The first part paper presents results FEM modelling stepped axles shafts (solid hollow). analysis performed using MSC Simufact Forming software. nume...

To meet the requirement of lightweight, an increasing number solid shafts are designed to be hollow in transportation industry. In this study, a novel method flat-knifing cross-wedge rolling (FCWR) with single guide is proposed including modified roller, horizontal mill, and single-guide structure, its key problems studied by numerical simulations experimental tests. A mathematical model FCWR r...

This paper is focused on the inherent characteristics of main drive system F5 cold-rolling mill in a steel plant. First, transmission mechanical structure was simplified to five-inertia torsional vibration model. Secondly, coupled model strip and roll established. The electromechanical coupling motor control rotor established again. Finally, AMESim software used calculate natural frequency unde...

This paper investigates a recently derived lower bound stability measure for sampled-data controller structures subject to finitewordlength (FWL) constraints. The optimal realization of the digital PID controller with FWL considerations is formulated as a nonlinear optimization problem, and an efficient strategy based on adaptive simulated annealing (ASA) is adopted to solve this complex optimi...

A prototype of an automated visual on-line metal strip inspection system is described. The system is capable of both detecting and classifying the surface defects of copper alloy smp. It has been installed on a production line in a rolling mill for evaluation. The inspection algorithms are based on morphological preprocessing and combined statistical and structural defect recognition. The image...

In this paper, a tree based neural network viz. MARS (Friedman, 1991) for the modelling of the yield strength of a steel rolling plate mill is described. The inputs to the time series model are temperature, strain, strain rate, and interpass time and the output is the corresponding yield stress. It is found that the MARS-based model reveals which variable's functional dependence is nonlinear, a...

Transfer table is an essential stage between roughing and finishing rolling stands in a hot-strip rolling mill. High temperature and long time that strip is exposed to air at this stage cause a considerable heat loss that accounts for uneven temperature distribution, non-uniform surfaces, reduced product quality and increased production costs. Using thermal shields on the transfer table is cons...

The contribution concerns the design of a generalised functional-link neural network with internal dynamics and its applicability to system identification by means of multi-input single output non-linear models of autoregressive with exogenous inputs’ type. An evolutionary search of genetic type and multi-objective optimisation in the Pareto-sense is used to determine the optimal architecture o...