HRM Down Coiler Tips

Abstract

Seamless execution of QOC for the prevention of defect by hot rolled steel head mark requires accurate tip detection and tracking of material.
If coil is wound at permanent magnet and magnetism is brought near, magnetic flux changes at both tips of the coil, raising induction voltage. As induction voltage is proportional to the change of magnetic flux over time, the faster the material enters, the higher the voltage becomes. On the contrary, the slower the material enters, the less the magnitude of induction voltage.

Use

Detected signals, which are for accurate tip detection when material enters down coiler, are transferred to down coiler controlling PLC after being converted to contact point signals, and are used in the control of down coiler QOC. This equipment, which is utilized installed in the 3HRM No.2 down coiler of Gwangyang Steelworks, is an essential equipment in hot rolling process, an important equipment that should demonstrate 100% satisfactory performance.

Functions and Features

This equipment is divided broadly into two parts, sensor part which detects tip and control part which amplifier and controls signals.

Composition Chart

Sensor Unit

Controll Unit

	MCU	ATMeagal128
	MCU Speed	12MIPS
	Program Memory	128Kbyte
	SRAM Memory	32Kbit
	A/D Converter	10biy, 100us Read
	Sensor Input	Low Noise Amp AD620
	Input Speed	1MHz
	Transmitt Method	RS-422