Computer and Practical Simulation of the Surface Crack Reducing on the Billet during Bar and Wire Rod Rolling Process

摘要

The processors acting in the car industry make continuously a stress on producers of wires and rods to eliminate the occurrence of surface defects on the semi-finished products. A development of methods and working procedures aimed to avoid the occurrence of surface defects on wires and rods requires to know the origin of the defects and characteristics of their behaviour in the course of rolling. A set of practical tests examined the behaviour of an artificial crack in the course of rolling directly in realistic operation conditions of the continuous small-section rolling mill of rods and wires of Trinecke zelezarny a.s. A crack was created on billets and, after rolling, detected in final wire or rod. In this relation, the applied way of detection of hot and cold surface defects in the course of production and processing of wires and rods is presented applying facilities working on a base of eddy current checking. Applying the FEM, numeric simulation of a crack behaviour was prepared in the course of deformation of the rolling stock caused by passing between rolls.