Metallurgist VoL 40, Nos. 3 - 4. 1996

S Y S T E M F O R C O N T R O L L I N G A C O L D R O L L I N G R E V E R S I N G M I L L

A. A. Kurzykin t and A. N. Pipko I

Translated from Metallurg, No. 4, pp. 36 - 37, April, 1996.

The system for controlling a cold rolling reversing mill (MCS) is a multifunctional system and is designed for infor- mation provision and control o f the mill regimes, providing all required technological parameters of rolling. The MCS is based on UNIKONT software, hardware for control and dis- playing information, placed at the mill control points, and thyristor electric drivers, mechanisms, and machines of the mill (Fig. 1). A KPU controller is placed at control point No. 1 (CP-I), and a KSUS controller in the etectrotechnical room.

UNIKONT is designed for creation of information and control systems for the production process and allows combi- nation of the complexes of the user-defined configuration. It

t Rostov Branch ofTyazhpromelektroproekt JSC, Rostov-on-Don, Russia.

contains a wide range of modules for connection with the ob- ject, workstations and desktops for the process engineers, configurable desks for controlling the production process, and IRPS and ARCNET network equipment.

Technical characteristics of the central part o f U NIKONT are listed below:

Microprocessor . . . KI834 (80(7186 INTEL, 80286, 80386, 80486)

Processor rate, million operations / see . . . . . I (3, 6, 12, 40) Memory size, Mb . . . . . . . . . I - 16 Hard disk size, Mb 20 - 200 Number of free sites for installation

of an ordered part of the real-time complex with battery power supply 6 - 68

. . . . . . . . . . . . --t PUI

PTO

I Li:~ear indicators

I I

1

_,_,1 ~

I . . . . . . . . . ; , , , . , I . .

, . . . . . . . . . . ~i

UNIKONT UK-531

E l Discrete- signal

r input r

Diserete- gnal output

IRPS ;ontroller Analog-

gnal output

I M i l l

Dist~r~c- signal input

Controller of the mill Discrete- operation ~ignal output

desk IRPS controller

Analog- ;ignal outlml

Pulse-signal input

L f

I ] I ~ . . - - 1

I r l ~ L . . .

ARC'NET connection controller

ARCNET connection controller I

o p e r a t i o n c o n t r o l l e r

PU2 PTO

T Linear indicators

�9 l . . . . . . . . . . . | e e e i . . . . . . . . . . . I

UNIKONT UK-543

Analog-signal input I Analr Discrete-signal input I ~U = _+ 10 V) I

I " l

L_ 2BR- - �9 9BR

bsignal output [ Pulse-signal input [ Discrete-signal output']

_J

Fig. I. System for controlling a cold rolling reversing mill PTO) process control desk for displaying text and digital information; KTI~) complex thyristor transducers, DI-I, DI-2) detectors of set-screw pulses, DI-3, DI-4) detectors of coiler pulses

65 0026-0894/96/0304-0065515 O0 0 1997 Plenum Publi.shing Corporation

66 A . A . Kurzykin and A. N. Pipko

Furthermore, a timepiece with a battery power supply and connection with any foreign input-output devices are in- cluded in the design.

All functions of the MCS are divided into control, infor- mation, and auxiliary functions.

Control includes: - defining the tension for the coiling devices of the mill; - defining the speed of the mill for smooth acceleration to

any working speed given by the operator and deceleration from any speed to a lower one, stopping, or forced stopping;

- calculation and generation of the controlling signal for the current of the leR and right coilers to maintain a constant tension for the bar between the stand of rolls and the "coilers with the required accuracy, for motionlessness, acceleration, deceleration, and constant speed of the mill, taking into ac- count the changing diameter of the coil and the reduction of the bar;

- provision for automatic retardation and stopping of the mill with the required accuracy at the end of each cycle.

Tasks in controlling the mill regimes are solved with opti- mum use of motor power in all regimes and exclusion of an effect on the backlash tension in the stand of rollers.

Information functions supply the mill operators and the operation control department. For this purpose tools for dis- playing and indicating all technical and process parameters of mill and equipment operation, namely, bar tension, rolling speed, roll clearance, the remainder of the bar on the coiler, and bar thickness, were included in the design.

Auxiliary functions include software and hardware allow- ing fast search and elimination of breakdowns and failures in system performance.

The MCS was introduced on a Kvarto-66 cold-rolling mill at Stupinsk ISW. During the service life no failures in system operation due to breakdown of technical equipment were recorded. All performance characteristics of the system correspond to the technical specifications and fully satisfy the requirements of the production process.