RU2348474C1 - Screwdown structure of rolling mill - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: screwdown structure contains hydraulic actuator, located between mill bed and forming roll chock, and contains of cylindrical body, piston, rod and two basis, implemented of nonmagnetic materials, between which it is located piston, on side walls of which, directed to basis, are affixed plates, implemented of resistance material, and on the basis sides, directed to piston, installed field magnets, connected to charger.

EFFECT: lighter regulation of thickness and profile of strip in the range of defined allowance, improved rolled metal.

1 dwg, 1 ex

Description

The invention relates to rolling production and can be used on mills for hot and cold rolling of ferrous and non-ferrous metals and non-metallic materials.

A known method of rolling, rolling stand and pressure device rolling stands [1].

The cage pressure device comprises movable and fixed units in which electromagnetic systems are installed for interacting with each other.

Known pressing device rolling stands made in the form of an electromechanical and / or hydraulic device in combination with an electromagnetic device.

The hydraulic pressing device comprises a movable and fixed nodes equipped with electromagnetic systems containing at least two coils each, the fixed node is designed to interact with the pressure screw of the electromechanical pressure device, and the movable node is for articulated interaction with the pressure roll cushion.

A disadvantage of the known pressing device is the presence of an electromagnetic system in the form of coils in the moving unit, which directly interacts with the electromagnetic system of the fixed unit to create regulatory forces.

A rolling stand pressing device [2] is also known, comprising a rod made of a permanent magnet covered by an electromagnetic coil and coils mounted in cushions of the backup rolls mounted coaxially to each other.

The disadvantage of the known pressure device is the complexity of manufacturing the rod in the form of a permanent magnet that does not have the mechanical properties of steel, as well as the complexity of the design of the pillows, including the difficulty of connecting the coils mounted in the pillows with power sources.

A common disadvantage of known pressure devices is the complexity of their manufacture, repair and operation.

The objective of the invention is to simplify the design of the pressure device and increase its efficiency.

This task is achieved by the fact that the rolling stand pressing device containing a hydraulic cylinder located between the stand bed and the roll roll cushion consists of a cylindrical body, a rod and two bases made of non-magnetic materials, between which a piston is placed, on the sides of which are facing bases, plates made of conductive material are fixed, and on the sides of the bases facing the piston are inductors connected to the charger.

The pressure device contains a hydraulic system and a charger, as well as a cooling system for inductors, an automatic system for controlling the power and frequency of discharges to inductors and a control unit (not shown conventionally).

The rolling mill press device (not shown conditionally) contains a hydraulic cylinder having a cylindrical body 1, bases 2 and 3, piston 4, rod 5, inductors 6, hydraulic system 7, charger 8.

On the sides of the piston 4 facing the bases 2 and 3, plates 9 and 10 are fixed, and the inductors 6 are mounted on the sides of the bases 2 and 3 facing the piston 4.

The cylindrical housing 1, the bases 2 and 3 and the stem 5 are made of non-magnetic materials.

The piston 4 is made of insulating material.

The plates 9 and 10 are made of conductive material.

The pressing device rolling stands operates as follows.

(Example of rolling strip)

Positioning, that is, the initial installation of the rolls, the regulation of the rolling force and the roll gap in the rolling process is carried out using a hydraulic system 7 and an automatic strip thickness control system (not shown).

In the event that the strip thickness is exceeded from the specified tolerance field, as well as the strip profile is violated, inductors 2 or 3, depending on the sign of the tolerance field deviation, are supplied with electric current pulses (discharges) using a charger 8 and an automatic control system of different power and frequency , depending on the magnitude of the deviation of the strip thickness from the tolerance.

When a current pulse is applied to inductor 2 or 3, an alternating magnetic field arises, which induces an induction current in plates 9 and 10, which creates its own magnetic field around plates 9 and 10.

When the inductor field interacts with the magnetic field of the plate 9, a repulsive force + P _em arises, which adds up to the force P _g created by the piston 4, and the strip thickness decreases.

When the inductor field interacting with the field plate 10, a repulsive force arises -P _um, which is subtracted from the force F _g, a piston 4, and the thickness of the strip increases.

Using the proposed rolling mill pressing device, finer regulation of the thickness and profile of the strip within the specified tolerance is possible, which will make it possible to obtain higher quality rolled products.

Information sources

1. RF patent No. 2207925.

2. RF patent No. 2187394.

Claims (1)

A rolling stand pressing device comprising a hydraulic cylinder located between the bed stand and the roll roll cushion, characterized in that the hydraulic cylinder consists of non-magnetic materials of a cylindrical body, a rod and two bases, between which the piston is placed, on the piston lateral sides facing the bases, fixed plates made of conductive material, and on the sides of the bases facing the piston, inductors are connected to the charger.