MICROPROCESSOR BASED CONTROL SYSTEM' FOR CLOSE LAYING OF COILS IN THE WIRE ROD MILL COILER

Abstract

Coiler of wire rod mill is an important portion of overall wire rod manufacturing process. It is necessary to use coiler for coiling of finished wire rods because of its thinner cross-sections longer and nonstranded lengths. Opti-mum utilization of coiling space is of utmost importance in this process. In order to improve upon commercial acceptabi-lity it is also necessary to avoid end projections. In general present Wire Rod Mills do not fulfil these require-ments. This dissertation is therefore aimed at suggesting an experimentally verified method to achieve compact coils. ,A Wire Rod Mills, which is in operation at finishing zone of Bhilai Steel Plant, has been considered for arriving at suggestions for possible modifications. To start with operation of the mill has been critically studied. It was found out that in existing process (i) Coiling operation do not give compact coils, and (ii) the end projections of coils presents handling and quality control problems. In order to overcome above mentioned drawbacks of present system, a new microprocessor based coiler motor speed controller has been devised and experimented with. In order to introduce safety and protection against possible malfunction of scheme, interlocking between different drives (iv) has been retained in the suggested system also for experi-mentat ion.